s&c source-transfer vista underground distribution switchgear · the equipment covered by this...

S&C ELECTRIC COMPANY

Specialists in Electric Power Switching and Protection

Instruction Sheet 683-505August 20, 2001

©

2001

Supersedes Instruction Sheet 683-505 dated 4-24-00

S&C Source-Transfer Vista

®

Underground Distribution Switchgear

Pad-Mounted, Dry-Vault-Mounted, Wet-Vault-Mounted, and UnderCover™ Styles

Instructions For Installation

Section Page Section Page

INTRODUCTION

Qualified Persons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Read this Instruction Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . 2Retain this Instruction Sheet . . . . . . . . . . . . . . . . . . . . . . . . 2Proper Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

SAFETY INFORMATION

Understanding Safety-Alert Messages . . . . . . . . . . . . . . . . . 3Following Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . 3Replacement Instructions and Labels . . . . . . . . . . . . . . . . . 3Location of Safety Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

INSPECTION AND HANDLING—Pad-Mounted Style

Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

INSPECTION AND HANDLING—Dry-Vault-Mounted Style

Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

INSPECTION AND HANDLING—Wet-Vault-Mounted Style

Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

INSPECTION AND HANDLING—Undercover Style

Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

INSTALLATION

Enclosure Removal—Pad-Mounted Style . . . . . . . . . . . . . 13Tank Placement—Pad-Mounted Style . . . . . . . . . . . . . . . . 14Cable Terminations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Enclosure Placement—Pad-Mounted Style . . . . . . . . . . . 16Tank Placement—Dry-Vault-Mounted, Wet-Vault-Mounted

and UnderCover Styles . . . . . . . . . . . . . . . . . . . . . . . . . . 17

INSTALLATION—Continued

Cable Terminations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Enclosure Placement—Dry-Vault-Mounted, Wet-Vault-

Mounted, and UnderCover Styles . . . . . . . . . . . . . . . . . 19Grounding—Pad-Mounted and

Dry-Vault-Mounted Styles . . . . . . . . . . . . . . . . . . . . . . . . 20Grounding—Wet-Vault-Mounted and

UnderCover Styles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Current Sensors—Pad-Mounted and Dry-Vault-Mounted

Styles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Current Sensors—Wet-Vault-Mounted and

UnderCover Styles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Fault Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Low-Voltage Compartment Wiring—Pad-Mounted Style .27Low-Voltage Enclosure Wiring—

Dry-Vault-Mounted Style . . . . . . . . . . . . . . . . . . . . . . . . . 30Low-Voltage Enclosure Wiring—Wet-Vault-Mounted and

UnderCover Styles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Motor Operator Installation for—

Pad-Mounted and Dry-Vault Mounted Styles . . . . . . . . 36Motor Operator Installation for—

Wet-Vault-Mounted and UnderCover Styles . . . . . . . . . 38Initial Testing of Motor Operators and Controls . . . . . . . . 40Setting Up the Gear for Operation . . . . . . . . . . . . . . . . . . . 41Completing the Installation . . . . . . . . . . . . . . . . . . . . . . . . . 42

DIELECTRIC TESTING

Routine Switchgear Testing . . . . . . . . . . . . . . . . . . . . . . . . . 44Maximum Insulation Test Voltages . . . . . . . . . . . . . . . . . . 44Cable Testing and Fault Locating . . . . . . . . . . . . . . . . . . . . 45Maximum Cable Test and Cable Thumping Voltages . . . 46Fault-Interrupter Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . 46Vista Switchgear Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . 47Fault-Interrupter and Load-Interrupter Switch Ratings . 47

SPECIFICATIONS

Switchgear Styles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48Single-Pole or Three-Pole Fault-Interrupting . . . . . . . . . . 48Voltage Transformers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48Optional Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53Touch-Up Kit Components. . . . . . . . . . . . . . . . . . . . . . . . . . 53

683-505 2

INTRODUCTION

Ç

WARNING

The equipment covered by this publication must be installed, oper-ated, and maintained by qualified persons who are knowledgeablein the installation, operation, and maintenance of undergroundelectric power distribution equipment along with the associatedhazards. A qualified person is one who is trained and competent in:

•

The skills and techniques necessary to distinguish exposed liveparts from non-live parts of electrical equipment.

•

The skills and techniques necessary to determine the properapproach distances corresponding to the voltages to which thequalified person will be exposed.

•

The proper use of the special precautionary techniques, per-sonal protective equipment, insulating and shielding materials,and insulated tools for working on or near exposed energizedparts of electrical equipment.

These instructions are intended only for such qualified persons.They are

not

intended to be a substitute for adequate training andexperience in safety procedures for this type of equipment.

Qualified Persons

Read this Instruction Sheet

Read this instruction sheet thoroughly and carefully before installingor operating your S&C Source-Transfer Vista Underground Distribu-tion Switchgear. Familiarize yourself with “SAFETY INFORMATION”on pages 3 and 4.

Retain this Instruction Sheet

This instruction sheet is a permanent part of your S&C Source-Trans-fer Vista Underground Distribution Switchgear. Designate a locationwhere you can easily retrieve and refer to this publication.

Proper Application

Warranty

The standard warranty contained in S&C’s standard conditions ofsale, as set forth in Price Sheet 150, is applicable to the S&C Source-Transfer Vista Underground Distribution Switchgear covered in thisinstruction sheet.

Ç

CAUTION

The equipment in this publication must be selected for a specificapplication. The application must be within the ratings furnishedfor the equipment. Ratings for this gear are listed on a ratings labelat the front of the switchgear tank.

3 683-505

Understanding Safety-AlertMessages

There are several types of safety-alert messages which may appearthroughout this instruction sheet as well as on labels attached to theSource-Transfer Vista switchgear. Familiarize yourself with thesetypes of messages and the importance of the various signal words, asexplained below.

Following Safety Instructions

If you do not understand any portion of this instruction sheet andneed assistance, contact your nearest S&C Sales Office or S&C Autho-rized Distributor, or call S&C Headquarters at (773) 338-1000, Mondaythrough Friday between 8:30 AM and 5:00 PM Central Standard Time.(In Canada, call S&C Electric Canada Ltd. at (416) 249-9171, Mondaythrough Friday between 8:00 AM and 5:00 PM Eastern StandardTime.)

Replacement Instructions and Labels

If you need additional copies of this instruction sheet, contact yournearest S&C Sales Office, S&C Authorized Distributor, S&C Head-quarters, or S&C Electric Canada Ltd.

It is important that any missing, damaged, or faded labels on theequipment be replaced immediately. Replacement labels are availableby contacting your nearest S&C Sales Office, S&C Authorized Distrib-utor, S&C Headquarters, or S&C Electric Canada Ltd.

Ç

DANGER

“DANGER” identifies the most serious and immediate hazardswhich

will likely

result in serious personal injury or death if in-structions, including recommended precautions, are not followed.

Ç

WARNING

“WARNING” identifies hazards or unsafe practices which

can

re-sult in serious personal injury or death if instructions, includingrecommended precautions, are not followed.

Ç

CAUTION

“CAUTION” identifies hazards or unsafe practices which

can

resultin minor personal injury or product or property damage if instruc-tions, including recommended precautions, are not followed.

NOTICE

“NOTICE” identifies important procedures or requirements that, ifnot followed,

can

result in product or property damage if instruc-tions are not followed.

NOTICE

SAFETY INFORMATION

Read this instruction sheet thoroughlyand carefully before installing yourS&C Source-Transfer Vista Under-ground Distribution Switchgear.

683-505 4

Reorder Information for Safety Labels

Location Safety-Alert Message Description Number

A Ç

WARNING

Keep Out—Hazardous Voltage Inside G-6681

B Ç

DANGER

Hazardous Voltage—Always Consider Circuits and Components Live . . . G-6700

C Ç

DANGER

Never Drill Into Tank—Hazardous Voltage, Contains Pressurized SF

6

Gas G-6682

D Ç

DANGER

Keep Away—Hazardous Voltage (“Mr. Ouch”) G-6699

E Ç

WARNING

Check Gas Pressure Before Operating Switchgear G-6686

F Ç

WARNING

Always Test Voltage Indicator For Proper Operation G-6689

G Ç

WARNING

Always Visually Confirm Blade PositionG-6693

G-6694 (Option “-L2”)

SAFETY INFORMATION

Location of Safety Labels

A

Pad-mounted enclosure

B

C D

G

E

Low-voltage compartment

Top of switchgear(Manual unit shown for illustration purposes.)

F

5 683-505

Packing Pad-mounted style switchgear consists of the tank and the outerenclosure (which has the low-voltage compartment attached to it).Both are fastened to a wooden skid, with the tank shipped within theouter enclosure. Motor operators are individually packed and shippedin boxes. Optional current sensors are packaged three per box andare shipped separate from the gear.

All current sensor, voltage sensor, and motor operator wiring isrouted to the low-voltage compartment through a junction box that ismounted on the tank. These wires and cables are neatly coiled and seton the tank for user installation.

At the first opportunity, remove all packing materials (cardboard,paper, foam padding, etc.) from the outside of the pad-mounted enclo-sure. This will prevent the finish from being damaged by rainwaterabsorbed by the packing materials and will also prevent wind-inducedabrasion from loose cardboard.

Inspection Examine the shipment for external evidence of damage as soon afterreceipt as possible, preferably before removal from the carrier’s con-veyance. Check the bill of lading to make sure that all shipping skids,crates, and containers listed thereon are present.

If there is visible loss and/or damage:

1. Notify the delivering carrier immediately.2. Ask for a carrier inspection.3. Note condition of shipment on all copies of the delivery receipt.4. File a claim with the carrier.

If concealed damaged is discovered:

1. Notify the delivering carrier within 15 days of receipt of shipment.2. Ask for a carrier inspection.3. File a claim with the carrier.

Also notify S&C Electric Company in all instances of loss and/ordamage.

NOTICE Do not store outside. Weather conditions may damage uninstalledelectrical components.


683-505 6

Handling

Step 1

Use 6-foot or longer hoist slings of equallength to prevent damaging the enclosure ortank during lifting.

Ç WARNINGWhen handling an enclosure or tank with anoverhead hoist, observe standard liftingpractices as well as the general instructionsbelow. Failure to follow these precau-

tions can result in serious personal in-

jury or equipment damage.

Step 2

Arrange the hoist slings so as to distribute thelifting forces equally between the lifting tabs.Avoid sudden starts and stops. See Figures 1and 2.

Ç WARNINGDo NOT lift the pad-mounted enclosurewhile it is bolted to the skid with the tank.The lifting tabs on the pad-mounted enclo-sure will not support the combined weightof the pad-mounted enclosure and the tank.Before lifting with slings, follow the direc-tions under “Enclosure Removal Pad-Mounted Style” on pages 11 and 12. Failure

to follow these precautions can result

in serious personal injury or equipment

damage.


Figure 2. Tank for pad-mounted style.

Figure 1. Enclosure for pad-mounted style.

Lifting points XX

X

7 683-505

Packing Dry-vault-mounted style switchgear consists of the tank and the low-voltage enclosure. Each are fastened to their own wooden skid.Motor operators are individually packed and shipped in boxes.Optional current sensors are packaged three per box and are shippedseparate from the gear.

All external wiring is routed to the low-voltage enclosure through ajunction box that is mounted on the tank. These wires and cables areneatly coiled and set on the tank for user installation.

At the first opportunity, remove all packing materials (cardboard,paper, foam padding, etc.) from the outside of the low-voltage enclo-sure. This will prevent the finish from being damaged by rainwaterabsorbed by the packing materials and will also prevent wind-inducedabrasion from loose cardboard.









683-505 8

Handling

Step 3





Step 4


Figure 3. Tank for dry-vault-mounted style. (Floor-mount lifting scheme shown.)


Figure 4. Low-voltage enclosure for dry-vault-mounted style.

9 683-505

Packing Wet-vault-mounted style switchgear consists of the tank and the low-voltage enclosure. Each are fastened to their own wooden skid.Motor operators are attached to the cables and are individuallypacked and shipped in boxes. Optional current sensors are shippedattached to the gear by the required wiring.

All external wiring is coiled at the end of the tank for user installa-tion.










683-505 10

Handling

Step 5





Step 6


NOTICELow-voltage enclosure is not submersible.The enclosure should be mounted aboveground or in a dry location.

Figure 5. Tank for vault-mounted style. (Floor-mount lifting scheme shown.)


Figure 6. Low-voltage enclosure for vault-mounted style.

11 683-505

Packing

UnderCover style switchgear consists of the tank and the low-voltageenclosure. Each are fastened to their own wooden skid. Motor opera-tors are individually packed and shipped in boxes. Optional currentsensors are shipped attached to the gear by the required wiring.

All external wiring is coiled at the end of the tank for user installa-tion.


Inspection

Examine the shipment for external evidence of damage as soon afterreceipt as possible, preferably before removal from the carrier’s con-veyance. Check the bill of lading to make sure that all shipping skids,crates, and containers listed thereon are present.






NOTICE

Do not store outside. Weather conditions may damage uninstalledelectrical components.

INSPECTION AND HANDLING—UnderCover Style

683-505 12

Handling

Step 7


Ç

WARNING

When handling an enclosure or tank with anoverhead hoist, observe standard liftingpractices as well as the general instructionsbelow.

Failure to follow these precau-



Step 8


NOTICE

Low-voltage enclosure is not submersible.The enclosure should be mounted aboveground.

Figure 7. Tank for UnderCover style.

INSPECTION AND HANDLING—UnderCover Style

Figure 8. Low-voltage enclosure for UnderCover style.

13 683-505

INSTALLATION

Enclosure Removal—Pad-Mounted Style

Step 9

Loosen the pentahead bolts securing thehinged roofs to the enclosure using a penta-head socket wrench with extender or a penta-head tool. See Figure 9.

Step 10

Lift the hinged roofs upward and secure themwith the holders. Make sure that the low-volt-age compartment door is closed. See Fig-ure 10.

Pentahead wrench with extender

Frontpanel

Holder

Hinged roofs

Operation compartment

Termination compartment

Front panel

Low-voltage compart-ment


Figure 9. Pad-mounted style gear.

Figure 10. Pad-mounted style gear—roofs open.

683-505 14

Step 11

Unbolt the enclosure from the skid andremove it, observing the precautions givenunder “Handling” on page 6. Use a three-pointlifting scheme to properly balance the enclo-sure. Set the enclosure aside in a protectedarea. See Figure 11.

INSTALLATION

Terminationcompartment


Lifting point

Lifting point

Lifting point

Figure 11. Top view of pad-mounted style gear, displaying three-point lifting.

Not to be used as a lifting point

Tank Placement—Pad-Mounted Style

Step 12

Unbolt the tank from the skid and lift it abovethe mounting pad, observing the precautionsgiven under “Handling” on page 6. Use a four-point lifting scheme to properly balance thegear. Verify that the tank is positioned cor-rectly with respect to the cables and anchorbolts.

Step 13

Lower the tank into place. Secure the tank tothe pad using the anchor brackets provided.See Figure 12.

Figure 12. Tank as shipped. (Manual unit shown for illustrationpurposes.)

Bushings

shown with covers removed

Shipping coversShipping

covers

Bolts

15 683-505

Cable Terminations

Step 14

Remove the shipping covers from the bush-ings and bushing wells. See Figure 13.

Ç

DANGER

Before energizing the switchgear, replacethe shipping caps on all bushings and bush-ing wells with elbows or insulated protec-tive covers or plugs.

Failure to replace

the shipping caps with elbows or insu-

lated protective covers or plugs can

result in a flashover and serious per-

sonal injury or death.

Step 15

Terminate the cables with elbows followingthe elbow manufacturer’s instructions. SeeFigure 14.

Ç

CAUTION

ALWAYS

follow proper cable installationpractices. When installing cable to theswitchgear, provide a strain-relief segmentto minimize load on the bushings. Cablesmust be allowed to expand and flex withoutputting significant load on the bushings. Forpit installations, either loop the cable in thepit, or bring it into the pit horizontally andup to the gear at a 90º angle.

Failure to fol-

low these precautions can result in

damage to the bushings and bushing

wells and subsequent leakage of the

SF

6

insulating gas.

Shipping covers

are provided for bush-ing wells

Shipping covers

removed

Fault-interrupterterminals

are equippedwith 200-ampere bushing wells or 600-amperebushing as specified

Shipping covers

are provided for bushings

Load-interrupter switch terminals

are equipped with 600-ampere bushings or 200-ampere bushings as specified

Elbows and inserts—

supplied by user

Bushing and bushing well interfaces conform to ANSI/IEEE Standard 386 to accept standard elbows and inserts

Figure 13. Vista tank with shipping covers. (Manual unit shown forillustration purposes.)

Figure 14. Vista tank shown with user-supplied cables and elbows.(Manual unit shown for illustration purposes.)

INSTALLATION

683-505 16

Enclosure Placement—Pad-Mounted Style

Step 16

Lift the enclosure into place over the tank,observing the precautions given under “Han-dling” on page 6. Again, use a three-point lift-ing scheme to properly balance the enclosure.See Figure 15.

Ç

CAUTION

When installing the pad-mounted enclosureover the tank, place the side of the enclo-sure with the “Termination Compartment”label over the teminators and the side ofthe enclosure with the “Operation Com-partment” label over the operating mecha-nisms. This will ensure that thecompartments are properly identified andthe panels are in their correct locations.

Step 17

Refer to the catalog dimensional drawing fur-nished and verify that the enclosure compart-ments are positioned correctly and that theenclosure is properly aligned with respect tothe anchor bolts.

Secure the enclosure to the pad using theanchor brackets provided. See Figure 16.

Lowering enclosure over tank

Low-voltagecompartment

Figure 15. Three-point lifting scheme.

Gasket

Enclosure

1.5

�

min.

Four

⁵⁄₈

�

dia. anchor bolts by user

Anchor bracket

Figure 16. Anchor bracket placement.

INSTALLATION

17 683-505

INSTALLATION

Tank Placement—Dry-Vault-Mounted, Wet-Vault-Mounted, and UnderCover Styles

Step 18

Remove the switchgear from its crate and liftthe gear, observing the precautions givenunder “Handling” on pages 8, 10, and 12.

Secure the switchgear in place in accor-dance with the pull box or wall brackets pro-vided by the user. See Figure 17.

Figure 17. Switchgear is bolted to skid in four places for shipment.

Bushings

shown with covers removed

Shipping coversShipping

covers

Bolts

683-505 18

INSTALLATION

Cable Terminations

Step 19

Remove the shipping covers from the bush-ings and bushing wells. See Figure 18.

Ç

DANGER

Before energizing the switchgear, replacethe shipping caps on all bushings and bush-ing wells with elbows or insulated protec-tive covers or plugs.

Failure to replace

the shipping caps with elbows or insu-

lated protective covers or plugs can

result in a flashover and serious per-

sonal injury or death.

Step 20

Terminate the cables with elbows followingthe elbow manufacturer’s instructions. SeeFigure 19.

Ç

CAUTION

ALWAYS

follow proper cable installationpractices. When installing cable to theswitchgear, provide a strain-relief segmentto minimize load on the bushings. Cablesmust be allowed to expand and flex withoutputting significant load on the bushings. Forpit installations, either loop the cable in thepit, or bring it into the pit horizontally andup to the gear at a 90º angle.

Failure to fol-

low these precautions can result in

damage to the bushings and bushing

wells and subsequent leakage of the

SF

6

insulating gas.

Shipping covers

are provided for bush-ing wells

Shipping covers

removed

Fault-interrupterterminals

are equippedwith 200-ampere bushing wells or 600-amperebushing as specified

Shipping covers

are provided for bushings

Load-interrupter switch terminals

are equipped with 600-ampere bushings or 200-ampere bushings as specified

Elbows and inserts—

supplied by user

Bushing and bushing well interfaces conform to ANSI/IEEE Standard 386 to accept standard elbows and inserts

Figure 18. Vista tank with shipping covers. (Manual unit shown forillustration purposes.)

Figure 19. Vista tank shown with user-supplied cables and elbows.(Manual unit shown for illustration purposes.)

19 683-505

Enclosure Placement—Dry-Vault-Mounted andWet-Vault-Mounted Styles

Step 21

Unbolt the low-voltage enclosure from its skidand set it upright if necessary, observing theprecautions given under “Handling” on page 8.Use a two-point lifting scheme to properly bal-ance the enclosure. Verify that the enclosure ispositioned correctly for mounting to wall orpost.

Secure the low-voltage enclosure to a wallor post.

Enclosure Placement—UnderCover Style

Step 22

Unbolt the low-voltage enclosure from its skidand set it upright if necessary, observing theprecautions given under “Handling” on page16. Use a two-point lifting scheme to properlybalance the enclosure. Verify that the enclo-sure is positioned correctly for placement onuser pad. See Figure 20.

Secure low-voltage enclosure on user-sup-plied pad.

Figure 20. Low-voltage enclosure for UnderCover style.

INSTALLATION

683-505 20

Grounding—Pad-Mounted andDry-Vault-Mounted Styles

Step 23

Connect the ground pad of the tank and theground pad inside the enclosure to the systemground facility in accordance with the user’sstandard grounding practice. See Figure 21.For Pad-Mounted Style use ground pad asindicated in Figure 23.

Use the equivalent of 4/0 copper (or cablesized in accordance with the user’s standardpractice) in either a single or multiple connec-tion to realize the maximum momentary ratingof the switchgear. For a multiple connection,cables smaller than 1/0 copper or equivalentshould not be used.

Step 24

Connect the cable concentric-neutral groundwires to the grounding system as appropriate.See Figure 21.

Step 25

Connect the tank ground pad to enclosure padwith the shortest possible connection. Use theequivalent of 4/0 copper (or cable sized inaccordance with the user’s standard practice).See Figure 22.

Ç IMPORTANTTo ensure proper operation of the compo-nents inside the low-voltage enclosure, con-nect the tank ground pad and the enclosureground pad provided near the low-voltageenclosure, to the system ground facility.

Tank ground pad

Ground in accordance with user’s standard grounding practice

Figure 21. Tank ground pad.

Enclosureground pad

Figure 22. Pad-mounted enclosure ground pad.

INSTALLATION

21 683-505

INSTALLATION

Grounding—Wet-Vault-Mounted and UnderCover Styles

Step 26

Connect the cable concentric-neutral groundwires to the grounding system as appropriate.See Figure 24.

Step 27

Connect the heavy shielded cable tails fromeach of the main cables to the tank groundpad using the clamshell connector provided.The shortest possible connection should bemade. There is one heavy shielded cable tailper motor operated way.

Figure 24. Connect shielded cable to tank ground.

Low voltage compartment

Tank ground pad


Termination compartment

Enclosure ground pad

Shortest possible connection

Figure 23. Pad-mounted enclosure ground pad orientation.

683-505 22

INSTALLATION

Current Sensors—Pad-Mounted andDry-Vault-Mounted Styles

Step 28

Optional current sensors are packaged threein a box.

1. Remove the current sensors, hardware, andwiring harness from the box marked “S&CCurrent Sensors.” Connect the current sen-sors to the wiring harness as shown on theinterconnection wiring diagram providedwith the gear. See Figure 25.

2. Place each current sensor in front of thephase of the way on which it will beinstalled.

Note:

Way and phase numbersare located above the bushing on the termi-nation side.

3. Record the magnitude ratio and phaseangle shift of each current sensor in theappropriate location (in accordance withthe way and phase on which the currentsensor will be installed) on the yellow cardprovided in the “Installation and OperationInformation Kit.” The magnitude ratio andphase-angle shift of each current sensor arewritten on a tag attached to the sensor andon the sensor.

4. Remove the

¹⁄₄

�

–20 gap nut on one of thecurrent sensors. Open the sensor and placeit around the appropriate high-voltagecable. All three current sensors for eachway must be installed with the polaritymarks facing in the same direction—prefer-ably up, so that the magnitude ratio andphase-angle shift values are visible. Thenreplace and tighten the gap nut.

Figure 25. Attach current sensors to required wiring.

23 683-505

INSTALLATION

5. Secure the current sensors to the high-volt-age cable below the cable terminator usingthe plastic tie wraps furnished. If the cablehas a grounded concentric neutral, the cur-rent sensor must be secured in one of thefollowing ways:

a. It may be placed around the concentricneutral, in which case the concentricneutral must be brought back throughthe current sensor. See Figure 26.

b. It may be placed above the concentricneutral, in which case the terminatordrain wire must be brought through thesensor. See Figure 27.

6. Install the other two current sensors of theset by repeating Steps 4 and 5 above.

7. Cross-check the magnitude ratio andphase-angle shift of each current sensorwith the information recorded on the yel-low card.

8. Remove and discard the attached tags.

Figure 26. Current sensors placed around cable’s grounded concen-tric neutral.

Figure 27. Current sensors placed above cable’s grounded concen-tric neutral.

683-505 24

INSTALLATION

Current Sensors—Wet-Vault-Mounted andUnderCover Styles

Step 29

Optional current sensors are already attachedto the required wiring. See Figure 28.

1. Place each current sensor in front of thephase of the way on which it will beinstalled.

Note:

Way and phase numbersare located above the bushing on the termi-nation side.

2. Record the magnitude ratio and phaseangle shift of each current sensor in theappropriate location (in accordance withthe way and phase on which the currentsensor will be installed) on the yellow cardprovided in the “Installation and OperationInformation Kit.” The magnitude ratio andphase-angle shift of each current sensor arewritten on a tag attached to the sensor andon the sensor.

3. Open the sensor with the sensor releasetool provided, place the sensor around theappropriate high-voltage cable. All threecurrent sensors for each way must beinstalled with the polarity marks facing inthe same direction—preferably up, so thatthe magnitude ratio and phase-angle shiftvalues are visible. Then close the sensor.

Figure 28. Wiring is already attached to the current sensors.

25 683-505

INSTALLATION

4. Secure the current sensors to the high-volt-age cable below the cable terminator usingthe plastic tie wraps furnished. If the cablehas a grounded concentric neutral, the cur-rent sensor must be secured in one of thefollowing ways:

a. It may be placed around the concentricneutral, in which case the concentricneutral must be brought back throughthe current sensor. See Figure 29.

b. It may be placed above the concentricneutral, in which case the terminatordrain wire must be brought through thesensor. See Figure 30.

5. Install the other two current sensors of theset by repeating Steps 4 and 5 above.

6. Cross-check the magnitude ratio andphase-angle shift of each current sensorwith the information recorded on the yel-low card.

7. Remove and discard the attached tags.

Figure 29. Current sensors placed around cable’s grounded concen-tric neutral.

Figure 30. Current sensors placed above cable’s grounded concen-tric neutral.

683-505 26

INSTALLATION

Fault Indicators

Step 30

Fault Indicators are to be furnished by theuser and installed in accordance with the man-ufacturer’s instructions Optional mountingprovisions for fault indicators (CatalogNumber Suffix “-F1” or “-F2” or “-F12”) areavailable. See Figure 31.

Step 31

If mounting provisions are specified, mountthe fault indicators on the mounting brackets.See Figure 32.

Figure 31. Mounting provisions for user-furnished fault indicators.

Figure 32. Mounting brackets for user-furnished fault indicators.

27 683-505

INSTALLATION

Low-Voltage Compartment Wiring—Pad-Mounted Style

Step 32

Uncoil the junction box main cables that willbe routed to the low-voltage compartment.See Figure 33. These cables have low-voltageconnectors on their ends.

Step 33

Using the pipe and sealing kit provided, feedthe junction box main cables with connectorsthrough the access port into the low-voltagecompartment, as follows.

a. Insert the three-inch PVC pipe throughthe access port. See Figure 34. Makesure that equal lengths of pipe are show-ing in the low-voltage compartment andthe pad-mounted enclosure.

Access ports

PVC pipe

Figure 34. Insert PVC pipe through access port.

Motor operator cables

Main cables to low-voltage enclosure

Junction box

Figure 33. Junction box.

683-505 28

INSTALLATION

c. Carefully insert the connectors andcables through the three-inch PVC pipeinto the low-voltage compartment. SeeFigure 36.

d. Route the cables into the low-voltagecompartment and attach all connectorsusing the drawings provided. See Fig-ure 37.

Once all connections are made,straighten the cables within the low-voltage compartment and bundle themneatly by installing tie wraps.

Figure 36. Insert cables through PVC pipe.

b. Gather the ends of the main cablestogether and slip the butyl tubing overthe cables. See Figure 35. Slide the tub-ing far enough on the cables so that it ispositioned approximately two feet awayfrom the connectors.

Cables

Figure 35. Slide butyl tubing over cables.

Butyltubing

Figure 37. Attach connectors.

29 683-505

INSTALLATION

Figure 40. Stretch tubing over the PVC pipe and secure with tiewraps.

Finished cable connection assembly

e. Carefully insert ground wire G1 from thelow-voltage compartment through thePVC pipe into the main enclosure. Con-nect ground wire G1 to the copperground angle located on the tank usingthe shortest possible connection. SeeFigure 38.

f. If three-phase voltage sensing is speci-fied (Option D), then one ground wireper voltage sensor way is included withthe main cable assembly. Attach groundwires to the terminal block specified inthe drawings provided. See Figure 39.

g. While supporting the PVC pipe, stretchthe butyl tubing over the cables and overthe end of the PVC pipe by 1

¹⁄₂

inches.Install a large tie wrap around the diam-eter of the stretched butyl tubing that isoverlapping the PVC pipe.

h. Gather and twist the butyl tubing aroundthe cable bundle and apply tie wrapsalong the length of the excess butyl tub-ing. See Figure 40.

Figure 39. Attach ground wires to terminal block.

Figure 38. Attach ground wire G1 to tank.

683-505 30

INSTALLATION

Low-Voltage Enclosure Wiring— Dry-Vault-Mounted Style

Step 34

Uncoil the main cables that will be routed tothe low-voltage enclosure. These cables havelow-voltage connectors on their ends. SeeFigure 41.

Step 35

Using the conduit/tubing/bracket kit provided,feed the main cable with connectors throughthe access port into the low-voltage enclosure,as follows.

a. Locate the conduit/tubing assembly andthe two holding brackets and bolts asshown in Figure 42.

b. Put the holding brackets in the groovedchannel of the conduit as shown in Fig-ure 43.

Wire pass

Bracket

Figure 43. Place holding brackets in conduit channel.



Junction box


Figure 42. Conduit/tubing bracket assembly kit, shipped with gear.

31 683-505

INSTALLATION

c. Slide the assembly through the wire pass(located in the bottom of the low-voltageenclosure). Bolt the brackets down tothe enclosure floor as shown inFigure 44.

d. Gather the ends of the cables togetherand carefully insert the connectors andcables through the tubing and conduit,pushing them up into the low-voltageenclosure as shown in Figure 45.

Bolts

Figure 44. Set and secure assembly through wire pass.

Figure 45. Channel cables through wire pass.

683-505 32

INSTALLATION


e. Route the cables into the low-voltageenclosure and attach all connectorsusing the drawings provided. See Fig-ure 46 .

f. Attach ground wires to the terminalblock specified in the drawings pro-vided. See Figure 47.

g. Connect the heavy shielded cable to thecopper lug on the low-voltage enclosuregrounding plate. See Figure 48.

h. Once all connections are made,straighten the cables within the low-volt-age enclosure and bundle them neatly byinstalling the wraps.

i. Gather and twist the butyl tubing aroundthe cable bundle and apply tie wrapsalong the length of the excess tubing.

Step 36

When grounding the low-voltage enclosure tothe Vista tank,

it is very important to have onesolid ground connection from the low-voltageenclosure to the Vista tank. Provisions forgrounding wires and clamps on the low-volt-age enclosure are provided on the bottommounting channel. Tank grounding instruc-tions are found on page 20 of this instructionsheet.

Figure 47. Attach ground wires to terminal block.

Figure 48. Connect shielded cable to copper lug.

33 683-505

INSTALLATION

Low-Voltage Enclosure Wiring Wet-Vault-Mounted and UnderCover Styles

Step 37

Uncoil the main cables that will be routed tothe low-voltage enclosure. These cables havelow-voltage connectors on their ends. SeeFigure 49.

Step 38

Route the main cables to the low-voltageenclosure through conduit up to the cableentrance on the customer-supplied pad.

Step 39

Position the low-voltage enclosure on the cus-tomer-supplied pad so that the cableentrances are properly aligned.

Step 40

Using the conduit/tubing/bracket kit provided,feed the main cables with connectors throughthe access port into the low-voltage enclosure,as follows.

a. Locate the conduit/tubing assembly andthe two holding brackets and bolts asshown in Figure 50.

b. Put the holding brackets in the groovedchannel of the conduit as shown in Fig-ure 51.

Wire pass

Bracket

Figure 51. Place holding brackets in conduit channel.



Junction box


Figure 50. Conduit/tubing bracket assembly kit, shipped with gear.

683-505 34

INSTALLATION

Bolts

Figure 52. Set and secure assembly through wire pass.

c. Slide the assembly through the wire pass(located in the bottom of the low-voltageenclosure). Bolt the brackets down tothe enclosure floor as shown inFigure 52.

d. Gather the ends of the cables togetherand carefully insert the connectors andcables through the tubing and conduit,pushing them up into the low-voltageenclosure as shown in Figure 53.

Figure 53. Channel cables through wire pass.

35 683-505

INSTALLATION

a. Connect the heavy shielded cable to thecopper lug on the low-voltage enclosuregrounding plate. See Figure 54.

b. Route the cables into the low-voltageenclosure and attach all connectorsusing the drawings provided. SeeFigure 55.

c. Once all connections are made,straighten the cables within the low-volt-age enclosure and bundle them neatly byinstalling the tie wraps.

d. Gather and twist the butyl tubing aroundthe cable bundle and apply tie wrapsalong the length of the excess tubing.

Step 41

When grounding the low-voltage enclosure tothe Vista tank,

it is very important to have onesolid ground connection from the low-voltageenclosure to the Vista tank. Provisions forgrounding wires and clamps on the low-volt-age enclosure are provided on the bottommounting channel. Tank grounding instruc-tions are found on page 20 of this instructionsheet.

Figure 54. Connect shielded cable to copper lug.


683-505 36

INSTALLATION

Motor Operator Installation—Pad-Mounted and Dry-Vault-Mounted Styles

Step 42

Attach the motor operator to the gear. Placeeach motor operator over the operating shafton the gear. See Figure 56. Note: It may be nec-essary to manually rotate the motor operatorshaft (by twisting the operating disk) to lineup the operator key with the shaft notch key.See Figure 57.

Step 43

Remove the protective cap from the motoroperator mating plug. Insert motor operatorcable connector onto mating plug on operator,making sure the connector is keyed in prop-erly. Thoroughly tighten the connector ontothe mating plug by applying at least 4 full turnsto the connector.

Stop ring

Shaft

Notch key

Figure 56. Place the motor operator over the operating shaft on thegear.

Figure 57. Line up the operator key with the shaft notch key.

37 683-505

INSTALLATION

Bolt

Electrical operation mechanical blocking key

Operator mating plug

Figure 58. Connect the motor operator cable to the mating plug onthe operator.

Step 44

Secure each motor operator to the stop ringon the tank using the bolt provided. SeeFigure 58.

Step 45

An electrical operation mechanical blockingkey is attached to the back of the motor opera-tor with a chain. Fit this item into the operat-ing disk. See Figure 59.

Figure 59. Insert mechanical blocking key.

683-505 38

INSTALLATION

Motor Operator Installation— Wet-Vault-Mounted andUnderCover Styles

Step 46

Attach the motor operator to the gear. Placeeach motor operator over the operating shafton the gear. See Figure 60. Note: It may be nec-essary to manually rotate the motor operatorshaft (by twisting the operating disk) to lineup the operator key with the shaft notch key.See Figure 61.

Figure 60. Place the motor operator over the operating shaft on thegear.

Figure 61. Line up the operator key with the shaft notch key.

Stop ring

Shaft

Notch key

39 683-505

INSTALLATION

Figure 62. Secure the motor operator to the stop ring.

Step 47

Secure each motor operator to the stop ringon the tank using the bolt provided. SeeFigure 62.

Step 48

An electrical operation mechanical blockingkey is attached to the back of the motor opera-tor with a chain. Fit this item into the operat-ing disk. See Figure 63.

Figure 63. Insert mechanical blocking key.

683-505 40

INSTALLATION

Initial Testing ofMotor Operators and Controls

Step 49

In cases where voltage transformers internalto the tank provide power for the motor oper-ators and controls, test accessory TA-2669 isnecessary to power the controls when thegear is not energized. Refer to S&C InstructionSheet 515-510 for instructions on how to con-nect and operate the test accessory.

If test accessory TA-2669 is not specified,medium-voltage connections must be made topower the controls.

Once all of the preceding steps have beensuccessfully completed, turn on the powersupply power switch. See Figure 64.

The motor operator controls will indicatethe correct position of the motor operatorsand mechanism operating shafts via LEDs onthe front panel assembly. See Figures 66and 67.

Figure 66. “Open” indication on motor control board matches motor operator position.

Selector lever

Operating disk

Figure 64. Turning on the power supply.

Figure 65. “Open” position indication on motor operator.

Open LED

Power supply switch

41 683-505

INSTALLATION

Step 50

Verify that all LEDs are functional by pressingthe “PUSH TO TEST LAMPS” push button oneach control board. See Figure 67.

Step 51

On the Micro-AT place the “MANUAL/AUTO-MATIC” switch into “MANUAL.” See Figure 68.

Perform the following operations using thecontrol board buttons as shown in Figure 67.Verify that the motor operator moves to thedesired position and that the control boardLEDs also indicate the proper position. Thereis an electrical interface in the controls thatwill not allow the user to move to/from theclose position directly from/to the groundposition.

•

Close-to-Open

•

Open-to-Ground

•

Ground-to-Open

•

Open-to-Close

Note:

The electrical-operation mechanicalblocking key must be removed so it does notinterfere with the selector lever during opera-tion. See Figure 69.

Setting Up the Gear forOperation

Step 52

Use the motor operator controls or themanual handle to place the load switches andfault interrupters in their desired operatingpositions.

Note:

The electrical-operation mechanicalblocking key must be removed so it does notinterfere with the selector lever during opera-tion.

Step 53

Program the overcurrent control per S&CInstruction Sheet 681-515. Write the controlsettings on the label provided on the overcur-rent controls enclosure.

Push-to-test lamps button

Figure 67. Testing LEDs.

Figure 68. Manual/automatic switch on Micro-AT.

Figure 69. Remove mechanical blocking key.

683-505 42

INSTALLATION

Bottom ofenclosure

Front panelTerminationcompartment

Padlock

RTV silicon-rubber caulk


Front panel


Completing the Installation

Step 54

For Pad-Mounted Style:

A resilient closed-cell gasket on the bottom flange of the enclo-sure protects the finish from being scratchedduring installation and isolates it from thealkanlinity of a concrete foundation. Thisgasket also helps to seal the enclosure to thefoundation to guard against the entry ofrodents, insects, or weeds, and to discouragetampering.

In the event the gasket does not compen-sate for irregularities in the foundation, groutthe bottom of the enclosure as necessary. Anygrout applied should be recessed enough topermit caulking. To complete the installation,caulk around the bottom of the enclosure; aweatherproof silicon-rubber room tempera-ture vulcanizing (RTV) compound is recom-mended. Apply the caulk to fill the spacesbetween the cable and the conduit, and cap allempty conduits to prevent the entry of mois-ture and rodents. See Figure 70.

Step 55

Reinstall the front panels of the operation andtermination compartments. Lower the hingedroofs and secure them with the pentaheadbolts. Then insert a padlock into each hasp.Lock the low-voltage compartment or enclo-sure. See Figure 71.

Figure 70. Caulk around bottom of enclosure.

Figure 71. Lock the gear.

43 683-505

INSTALLATION

Red-oxide primer

Touch-up finish

Step 56

Wipe down the exterior of the enclosure witha clean, damp cloth. Refinish any scratches orabrasions with S&C touch-up finish and red-oxide primer which are available in aerosolspray cans. See Figure 72. Order CatalogNumber 9999-058 for olive green finish, 9999-080 for light gray finish, and 9999-061 for red-oxide primer. No other finish or primer isapproved. The area to be touched up shouldbe cleaned to remove all oil and grease. Sandthe area, removing any traces of rust that maybe present, and make sure that all edges arefeathered before applying primer.

Figure 72. S&C touch-up finish and red-oxide primer.

683-505 44

DIELECTRIC TESTING

Ç

WARNING

When performing electrical withstand tests on Vista switchgear,always observe the following precautions.

Failure to observe

these precautions can result in a flashover, injury, and

equipment damage.

1. Completely de-energize the switchgear and disconnect itfrom all power sources.

2. Terminate bushings with an insulated cap or other appropri-ate cable termination capable of withstanding the test volt-age.

3. Verify that the SF

6

pressure gauge is in the green zone.

MAXIMUM INSULATION TEST VOLTAGES

Vista Switchgear Rating, kV Withstand Test Voltage, kV

50 Hertz 60 Hertz Impulse (BIL) Power Frequency1

Dc23

12 15.5 95 27 42

24 27 125 40 62

36 38 150 50 82

1 The power-frequency withstand test voltages listed in the table areapproximately 80% of the design values for new equipment.2 The dc withstand test voltages listed in the table are approximately80% of the design values for new equipment.3 Dc withstand test voltages are given for reference only for those usersperforming dc withstand tests. The presence of these values does not

imply a dc withstand rating or performance requirements for the switch-gear. A dc withstand design test is specified for new equipment becausethe switchgear may be subjected to dc test voltage when connected to thecable. The dc withstand test values listed in the table are approximatelyequal to the ac peak test voltage.

Routine Switchgear Testing

For the convenience of users who normallyperform electrical tests on system compo-nents such as switchgear, appropriate with-stand test values for Vista switchgear are givenin the table below. These test values are signif-icantly greater than the normal operating volt-age of the switchgear and are near theflashover voltage of the gear. They should beapplied only when the switchgear is com-pletely de-energized and disconnected from allpower sources.

Ç

CAUTION

On Vista switchgear equipped with internalvoltage transformers: Do not apply testvoltage greater than normal system voltageto the “B” phase unless both incoming load-interrupting switches are in the open posi-tion. Refer to diagram below to determinelocation of B phase. If above is not fol-lowed, damage to the voltage transformerswill result.

X X

X Do not apply test voltage to incoming source ways.

45 683-505

DIELECTRIC TESTING

Cable Testing and FaultLocating

Dc testing of installed cables is performed todetermine the condition of the cables and tolocate faults. Industry standards, such asIEEE 400, “IEEE Guide for Making High-Direct-Voltage Tests on Power Cable Systemsin the Field,” describe such testing and shouldbe referenced for selection of the test proce-dures. Dc testing also includes cable “thump-ing,” i.e., the sudden application of dc voltagefrom a large capacitor for the purposes offault locating, which causes transients andvoltage doubling at the end of the open cable.When the cables are attached to the switch-gear, the gear will also be subjected to the dctest voltages.

Ç

CAUTION

On Vista switchgear equipped with internal voltage transform-ers: Do not apply test voltage greater than normal system voltageto the B phase of the incoming source ways. Refer to diagrambelow to determine location of B phase. Damage to the voltagetransformers will result if above is not followed.

Ç

WARNING

The dc withstand capability of the switchgear may be reduceddue to aging, damage, gas leakage, or electrical or mechanicalwear. Therefore, the dc test voltage must be selected such that itdoes not exceed the withstand limits of the switchgear.

Applica-

tion of dc test voltages greater than the withstand capabil-

ity of the switchgear can result in a flashover, injury, and

equipment damage.

In addition, always verify that the SF

6

pressure gauge is inthe green zone before proceeding with any testing.

Ç

DANGER

Do not exceed the test voltages given in the table on pages 44and 46. Exceeding the test voltages can cause a flashover of theisolating gap or phase-to-phase insulation of the switchgear.

This can lead to a power-frequency fault in the gear or of

the dc test source and result in severe personal injury or

death.

Do not perform cable testing on “X”ed ways unless the cable is removed from the gear.

XX

683-505 46

DIELECTRIC TESTING

Vista switchgear has been designed to allowdc testing of the cables with the other ways ofthe gear energized. The integral groundingswitch may be used to ground the cable. Aftertesting, the dc test equipment should be usedto discharge any stored charge on the cablebefore grounding with the grounding switch.The dc test voltages and dc cable thumpingvoltages should not exceed the voltages givenin the table below.

MAXIMUM CABLE TEST AND CABLE THUMPING VOLTAGES

Vista Switchgear Rating, kVdc Cable Test Voltage, kV dc Cable Thumping

Voltage, kV1

50 Hertz 60 Hertz Impulse (BIL)

12 15.5 95 30 15

24 27 125 40 20

36 38 150 40 20

1 The dc cable thumping voltage is 50% of the dc cable test voltagebecause of voltage doubling that will occur at the open end of the cablewhich is assumed to be a unit of Vista switchgear. If the open end of thecable is grounded, the dc cable thumping voltage applied to the cable andswitchgear can be increased to the dc cable test voltage.

Fault-Interrupter Testing

When performing dielectrical tests on Vistaswitchgear, the vacuum fault interrupters willnot be subject to voltage across the open gapbecause the disconnect switch will isolate thevacuum interrupter from the test voltage.Since the vacuum interrupter will not be ener-gized across the open gap, there is no expo-sure to X-rays that are normally associatedwith high-voltage testing of vacuum devices.Routine testing of the vacuum fault interrupt-ers is not recommended. For those users whodesire to test the vacuum interrupters, contactthe nearest S&C Sales Office for specificinstructions.

Ç

WARNING

When it is necessary to test the cables connected to a unit ofenergized switchgear, proper isolation of the power-frequencysource from the dc test source must be maintained. Follow therecommendations by the manufacturer of the dc test equipmentor fault-locating equipment. The user’s operating and safety pro-cedures should be followed for grounding the cable, connectingthe dc test source, isolating the dc test source (in case of flash-over), ungrounding the cable, applying the dc test source, dis-charging the cable, and regrounding the cable.

47 683-505

DIELECTRIC TESTING

VISTA SWITCHGEAR RATINGS12

Rating, kV

System ClassMax BIL

IEC ANSI

12

24

36

15.5

27

38

15.5

29

38

95

125

150

1 IEC ratings have been tested in accordance with the applicable por-tions of IEC 265-1 for a Class A switch.2 ANSI ratings have been tested in accordance with the applicable por-tions of ANSI C37.71, C37.72, and C37.73.

FAULT-INTERRUPTER AND LOAD-INTERRUPTER SWITCH RATINGS1234

ApplicableStandard

Amperes, RMS

Frequency,Hertz

Fault Interrupter Load-Interrupter Switch

Short-Circuit (Sym.)Cont.5

Load Splitting

(Parallel or Loop

Switching)5

LoadDrop-

ping56

Ten-Time Duty-Cycle

Fault-Closing (Sym.)

Ten-Time Duty-Cycle

FaultInterrupting

(Sym.)

Cont.

Load Splitting

(Parallel or Loop

Switching)

LoadDrop-ping6

Ten-TimeDuty-Cycle

Fault-Closing (Sym.)

Momentary (Sym.)

1 Sec. (Sym.)

IEC 50 or 60 200 200 200 12 500d

12 500 630 630 630 12 500d

12 500 12 500 12 500

ANSI 50 or 60 200 200 200 12 500d 12 500 600 600 600 12 500d 12 500 12 500 12 500

1 IEC ratings have been tested in accordance with the applicable por-tions of IEC 265-1 for a Class A switch.

2 ANSI ratings have been tested in accordance with the applicable por-tions of ANSI C37.71, C37.72, and C37.73.

3 The bus terminals of Model 201 are equipped with 200-ampere bush-ings wells, and the bus terminals of all other models are equipped with600-ampere bushings unless option suffix “-M4” is specified.

4 Contact the nearest S&C Sales Office for other possible ratings.

5 Fault interrupters furnished with optional 600-ampere bushings inlieu of 200-ampere bushing wells are rated 600 amperes (630 amperes forIEC) continuous, load splitting, and load dropping.

6 The fault-interrupter and load-interrupter switch can switch the mag-netizing current of transformers associated with the load-droppingrating. In addition, unloaded cable switching ratings are as follows: 10amperes at 15.5 kV and 20 amperes at 29 kV and 38 kV.

d 32,500 amperes peak.

683-505 48

SPECIFICATIONS

SWITCHGEAR STYLE (to accommodate the installation)

Item

Suffix tobe Added

to Switchgear Catalog Number

Applicable to Models

UnderCover Style. Includes stainless-steel tank, submersible wiring, and a 25-foot submersiblecontrol cable to mild-steel low-voltage enclosure -U

321, 330

422, 431, 440

532, 523, 550

Dry-Vault-Mounted Style. Includes mild-steel tank and a 15-foot control cable to mild-steel low-voltage enclosure. Does not include submersible wiring

-V3 All models

Wet-Vault-Mounted Style. Includes stainless-steel tank, mild-steel low-voltage enclosure, submers-ible wiring, and 25-foot submersible control cable -V4

321, 330

422, 431, 440

532, 523, 550

Pad-Mounted Style. Includes mild-steel tank and mild-steel or stainless-steel outer enclosure and low-voltage compartment

Mild-steelouter enclosure

Olive green finish -P6321, 330, 422, 431, 440

532, 523, 550

Light gray finish -P11321, 330, 422, 431, 440

532, 523, 550

Stainless-steelouter enclosure

Olive green finish -P16321, 330, 422, 431, 440

532, 523, 550

Light gray finish -P21321, 330, 422, 431, 440

532, 523, 550

SINGLE-POLE OR THREE-POLE FAULT-INTERRUPTING1

Item

Suffix tobe Added



Single-Pole Manual Fault Interrupters on all fault interrupting ways -T0 321, 431, 422, 523, 532

Three-Pole Manual Fault Interrupter on one fault interrupting way (single-pole manual fault interrupters on all other fault interrupting ways) -T1 321, 431, 422, 523, 532

Three-Pole Manual Fault Interrupters on two fault interrupting ways (single-pole manual fault interrupters on all other fault interrupting ways) -T2 422, 523, 532

Three-Pole Manual Fault Interrupters on three fault interrupting ways (single-pole manual fault interrupters on all other fault interrupting ways) -T3 523

1 Refer to the nearest S&C Sales Office for other possible configura-tions.

VOLTAGE TRANSFORMERS

1 For additional system operating voltages, refer to the nearest S&C Sales Office.

System Voltage, kV1 Suffix to be Added toCatalog Number Applicable to Models

4.16 -X1

All models

7.2 -X2

8.32 -X3

12 -X4

12.47 -X4

13.8 -X5

14.4 -X5

23 -X6

24.9 -X6

27.6 -X7

34.5 -X8

49 683-505

SPECIFICATIONS

OPTIONAL FEATURES

Item

Suffix tobe Added



Stainless-Steel Tank. Applicable only to Pad-Mounted and Dry-Vault-Mounted Switchgear Styles -S

321, 330

422, 431, 440

523, 532, 550

Stainless-Steel Low-Voltage Enclosure. Applicable only to Undercover Style and Vault-Mounted Style Switchgear -E

321, 330, 422, 431, 440

523, 532, 550

Mounting Provisions for a Fault Indicator for each Load-Interrupter Switch. Applicable only to Pad-Mounted Style Switchgear

NOTE: Accommodates three-phase indicator with single-phase sensors

Without viewing window in pad-mounted enclosure -F1

321, 422

330, 431

440

523, 532

550

With viewing window in pad-mounted enclosure -F2d

321, 422

330, 431

440

523, 532

550

Control Cable for UnderCover and Wet-Vault-Mounted Style Switchgear (25-foot length is stan-dard) connects Vista UDS tank to low-voltage enclosure

35-foot length -J35All models with optionsuffix “-U” or “-V4”

45-foot length -J45

Control Cable for Dry-Vault-Mounted Style Switchgear (25-foot length is standard) connects Vista UDS tank to low-voltage enclosure

35-foot length -H35 All models with optionsuffix “-V3”45-foot length -H45

1 All bus terminals are normally equipped with 600-ampere bushings.

d When ordering optional feature “-F2” for use with a stainless-steelpad-mounted enclosure, specify suffix “-F12” instead of “-F2.”

TABLE CONTINUED v

683-505 50

SPECIFICATIONS

OPTIONAL FEATURES

Item

Suffix tobe Added



600-Ampere Bushings without Studs, at load-interrupter switch and bus terminals -M1

321, 422

330, 431

440

523, 532

550

600-Ampere Bushings in Lieu of 200-AmpereBushing Wells, at fault interrupter and busterminals1

Without studs -M2

321, 431

422

523

532

With studs -M3

321, 431

422

523

532

Arc Resistance for Vault-Mounted Style Vista (arc resistance is standard for Pad-Mounted and UnderCover styles), per IEC 298 Appendix AA, for arcs occurring internal to the Vista tank (15 cycles, 12 kA symmetrical)

-N All models with option suffix “-V3”or “-V4”

Two-Hole Ground Pads, one per way, located below bushings or bushing wells (in lieu ofstandard one ground pad per tank) -O

321, 330

422, 431, 440

523, 532, 550

1 Refer to the nearest S&C Sales Office for alternate bushing configura-tions.

TABLE CONTINUED v

51 683-505

OPTIONAL FEATURES

Item

Suffix tobe Added



Remote Low-Pressure Alarm—includes internal contact for remote low-pressure indication, with wiring to outside of tank

With wires routed on tank for future customer connections

-R11 For Pad-Mounted and Dry-Vault-Mounted installation styles

-R12 For UnderCover and Wet-Vault-Mounted installation styles

With wires terminated in enclosure that is furnished with a terminal block for customer connections

-R2 Only available for Pad-Mounted and Dry-Vault-Mounted Style units

External Trip Provisions. Allows three-pole tripping of single-pole or three-pole fault interrupters via a trip signal from a remote loca-tion or an external relay1

In addition to standard overcurrent control for all fault interrupters

For Pad-Mounted and Dry-Vault-Mounted installation styles -R31

321, 422, 431

523

532

For UnderCover and Wet-Vault-Mounted installation styles -R32

321, 422, 431

523

532

In lieu of standard overcurrent control and current transform-ers for all fault inter-rupters

For Pad-Mounted and Dry-Vault-Mounted installation styles -R41

321, 431

422

523

532

For UnderCover and Wet-Vault-Mounted installation styles -R42

321, 431

422

523

532

1 The external trip board can be powered by user-supplied 120 Vac50/60 Hz, 120 Vac 50/60 Hz supplied by a voltage transformer internal tothe tank (option suffix “-Y4”), or 36 Vdc supplied by the Vista batterycharger.

SPECIFICATIONS

TABLE CONTINUED v

683-505 52

OPTIONAL FEATURES—Continued

Item

Suffix tobe Added



Copper Bus -Z5

321, 330

422, 431, 440

523, 532, 550

Potential Indication with Test Feature. Includes LCD display to indicate presence of voltage on each phase, and solar panel to supply power for testing of complete voltage-indication circuit and phasing circuit (if furnished). One potential indica-tor is provided for each bus-terminal, load-inter-rupter switch, and fault-interrupter way

Without provisions for low-voltage phasing -L1

321, 330

422, 431, 440

523, 532, 550

With provisions for low-voltage phasing -L2

321, 330

422, 431, 440

523, 532, 550

Overcurrent Lockout—includes S&C three-phase current sensors on each source-way

-Y21 All models with option suffix “-V3” or “-P6” through “-P21”

-Y22 All models with option suffix “-V4” or “-U”

Remote Indication. Includes provisions for remote monitoring of presence or absence of source voltages, manual or automatic operating mode, status of the “ready” indicator, “event” indicator, and overcurrent lockout

-Y4 All models

Test Panel. Permits the use of an external, adjustable three-phase source to verify, through independent measurement, the response of the control to loss-of-source, phase-unbalance, and overcurrent lockout (if furnished) conditions

-Y5 All models

Supervisory Control. Permits switch operation from a remote location -Y6 All models

Communications Card. Permits local uploading of “events” and settings from the Micro-AT control to use a user-furnished personal computer, as well as down-loading of the user’s stan-dard operating parameters

-Y8 All models

Electrical Antiparalleling. Prevents paralleling of two sources -Y10321, 330, 440, 431, 422

523, 550f

f Only available in common bus configuration.

SPECIFICATIONS

53 683-505

SPECIFICATIONS

TOUCH-UP KIT COMPONENTS—Aerosol Coatings in 9-ounce cans

Item Catalog Number

S&C Light Gray Outdoor Finish 9999-080

S&C Olive Green (Munsell 7GY3.29/1.5) Outdoor Finish 9999-058

S&C Red-Oxide Primer 9999-061

ACCESSORIES

Item Catalog Number

S&C Test Accessory. Permits preliminary checkout of source-transfer control using single-phase 120-volt ac source (before medium-voltage connections are made to the Vista underground distribution switchgear) to expedite full service once medium voltage is available

TA-2669�

Overcurrent-Control Adapter Cable. Cable required for programming overcurrent control

For connecting control to user-furnished personal computer in the field

For personal computers having 25-pin serial communication port TA-2366


For connecting control (removed from its enclosure) to user-furnished personal computer in the shop



Micro-AT Communications Cable. For connecting optional communications card to user-furnished personal computer. Includes Matlink communication software on 3.5-inch DOS-format diskette



Pentahead Socket, for ¹⁄₂-inch drive 9931-074

Portable Motor Operator. Permits operation of load-interrupter switches and single- or three-pole fault interrupters from a remote location. Includes carrying case and 50-foot length control cable with remote controls, utilizes powersupplied by

User-furnished 12-volt battery andbattery charger 38320

S&C-furnished 2-volt battery andbattery charger 38322

S&C-furnished ac input power supply 38323

� Catalog Number TA-2669 is only intended for use with Micro-AT Con-trols. Contact the nearest S&C Sales Office for test accessories for usewith Type AT Controls.

s&c source-transfer vista underground distribution switchgear · the equipment covered by this...

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