s&c alduti-rupter switches - s&c electric company...crank mounted between switch poles, the...

S&C ELECTRIC COMPANYSpecialists in Electric Power Switching and Protection

Instructions for Installation and Operation

S&C Alduti-Rupter® SwitchesThree-Pole Side-Break Heavy-Duty Style Reciprocating Operating Mechanism 34.5 kV

Instruction Sheet 761-575August 7, 2006 ©2006

Supersedes Instruction Sheet 761-575 dated 7-23-90

Section Page Section Page

INTRODUCTION Qualifi ed Persons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2Read this Instruction Sheet . . . . . . . . . . . . . . . . . . . . . .2Retain this Instruction Sheet . . . . . . . . . . . . . . . . . . . . .2Proper Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

SAFETY INFORMATIONUnderstanding Safety-Alert Messages . . . . . . . . . . . . .3Following Safety Instructions . . . . . . . . . . . . . . . . . . . .3Replacement Instructions and Labels . . . . . . . . . . . . . .3Location of Safety Labels and Tags . . . . . . . . . . . . . . . .4

PROPER APPLICATIONSwitching Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

PREPARING SWITCH FOR INSTALLATIONStandard Mounting Arrangements . . . . . . . . . . . . . . . .6Standard Minor Modifi cations . . . . . . . . . . . . . . . . . . . .7Power Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

INSTALLATIONMounting to Wood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8Uncrating the Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . .8Attaching Couplings to Switch Poles . . . . . . . . . . . . . .8Attaching Bell-Crank . . . . . . . . . . . . . . . . . . . . . . . . . . . .9Attaching Couplings to Bell-Crank . . . . . . . . . . . . . . . .9Lifting the Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10Installing Pipe Couplings

with Piercing Set Screws . . . . . . . . . . . . . . . . . . . . .12Installing Interphase Pipe . . . . . . . . . . . . . . . . . . . . . . .13Installing Vertical Operating Pipe . . . . . . . . . . . . . . . .14Installing Operating Handle . . . . . . . . . . . . . . . . . . . . .16Checking Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . .18Installing Key Interlock . . . . . . . . . . . . . . . . . . . . . . . . .20Checking Operation . . . . . . . . . . . . . . . . . . . . . . . . . . .21

OPERATIONOpening and Closing the Switch . . . . . . . . . . . . . . . . .28

TABLE OF CONTENTS

761-575 2

INTRODUCTION

Qualifi ed PersonsÇ WARNING

The equipment covered by this publication must be installed, operated, and maintained by qualifi ed persons who are knowledgeable in the installation, operation, and maintenance of overhead electric power distribution equipment along with the associated hazards. A qualifi ed person is one who is trained and competent in:

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

• The skills and techniques necessary to determine the proper approach distances corresponding to the voltages to which the qualifi ed person will be exposed.

• The proper use of the special precautionary techniques, personal protective equip-ment, insulating and shielding materials, and insulated tools for working on or near exposed energized parts of electrical equipment.

These instructions are intended only for such qualified persons. They are not intended to be a substitute for adequate training and experience in safety procedures for this type of equipment.

Read thisInstruction Sheet

Thoroughly and carefully read this instruction sheet before installing or operating your S&C Alduti-Rupter Switch. Familiarize yourself with “SAFETY INFORMATION” on pages 3 and 4.

Retain thisInstruction Sheet

This instruction sheet is a permanent part of your S&C Alduti-Rupter Switch. Designate a location where you can easily retrieve and refer to this publication.

Proper ApplicationÇ CAUTION

The equipment in this publication must be selected for a specifi c application. The application must be within the ratings furnished for the equipment. Refer to “PROPER APPLICATION” on page 5 for complete application information.

Warranty The warranty and/or obligations described in S&C’s standard conditions of sale, as set forth in Price Sheet 150, plus any special warranty provisions, as set forth in the applicable product-line specifi cation bulletin, are exclusive. The remedies provided in the former for breach of these warranties shall constitute immediate purchaser’s or end user’s exclusive remedy and a fulfi llment of all seller’s liability. In no event shall seller’s liability to immediate purchaser or end user exceed the price of the specifi c product which gives rise to immediate purchaser’s or end user’s claim. All other warranties whether express or implied or arising by operation of law, course of dealing, usage of trade or otherwise, are excluded. The only warranties are those stated in Price Sheet 150, and THERE ARE NO EXPRESS OR IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. ANY EXPRESS WARRANTY OR OTHER OBLIGATION PROVIDED IN PRICE SHEET 150 IS GRANTED ONLY TO THE IMMEDIATE PURCHASER AND END USER, AS DEFINED THEREIN. OTHER THAN AN END USER, NO REMOTE PURCHASER MAY RELY ON ANY AFFIRMATION OF FACT OR PROMISE THAT RELATES TO THE GOODS DESCRIBED HEREIN, ANY DESCRIPTION THAT RELATES TO THE GOODS, OR ANY REMEDIAL PROMISE INCLUDED IN PRICE SHEET 150.

The seller’s warranties do not apply if the switch is power operated using a switch operator of other than S&C manufacture.

761-5753

Understanding Safety-Alert Messages

There are several types of safety-alert messages which may appear throughout this instruction sheet as well as on labels and tags attached to the Alduti-Rupter Switch. Familiarize yourself with these types of messages and the importance of the various signal words, as explained below.

Ç DANGER“DANGER” identifi es the most serious and immediate hazards which will likely result in serious personal injury or death if instructions, including recommended precautions, are not followed.

Ç WARNING“WARNING” identifi es hazards or unsafe practices which can result in serious personal injury or death if instructions, including recommended precautions, are not followed.

Ç CAUTION“CAUTION” identifi es hazards or unsafe practices which can result in minor personal injury or product or property damage if instructions, including recommended precautions, are not followed.

NOTICE“NOTICE” identifi es important procedures or requirements that, if not followed, can result in product or property damage if instructions are not followed.

Following Safety Instructions

If you do not understand any portion of this instruction sheet and need assistance, contact your nearest S&C Sales Offi ce or S&C Authorized Distributor. Their telephone numbers are listed on S&C’s website www.sandc.com. Or call S&C Headquarters at (773) 338-1000; in Canada, call S&C Electric Canada Ltd. at (416) 249-9171.

NOTICE

Thoroughly and carefully read this instruction sheet before operating your S&C Alduti-Rupter Switch.

Replacement Instructions and Labels

If you need additional copies of this instruction sheet, contact your nearest S&C Sales Offi ce, S&C Authorized Distributor, S&C Headquarters, or S&C Electric Canada Ltd.

It is important that any missing, damaged, or faded labels on the equipment be replaced immediately. Replacement labels are available by contacting your nearest S&C Sales Office, S&C Authorized Distributor, S&C Headquarters, or S&C Electric Canada Ltd.

SAFETY INFORMATION

761-575 4

SAFETY INFORMATION

Location of Safety Labels and Tags

B

A

C

D

E

Reorder Information for Safety Labels

Location Safety-Alert Message Description Part Number

A Ç DANGER Electrocution Hazard G-6580-1

B Ç WARNING Piercing Set Screws G-3176R1d

C Ç WARNING Handle Operation G-4400R5

D Ç WARNING Electrocution Hazard – Grounding Strap G-6596d

E Ç WARNING Adjustment of Operating Mechanism G-5577R2d

d This part is a tag which is to be removed and discarded after the switch is installed and adjusted.

761-5755

PROPER APPLICATION

Switching RatingsÇ CAUTION

The equipment in this publication must be selected for a specifi c application. The application must be within the ratings furnished for the equipment.

In most applications, Alduti-Rupter Switches are capable of switching rated continuous load currents at full voltage. The ratings for the particular switch are listed on nameplates attached to the operating handle and the switch. See Figure 1.

Nameplate on operating handle

Nameplate on switch base

Figure 1. Switch nameplates with ratings.

These interrupter switches are not intended for breaking fault currents.

761-575 6

PREPARING SWITCH FOR INSTALLATION

Standard MountingArrangements

When a Standard Mounting Arrangement is specifi ed, the shipment includes:

• Three switch poles;

• Operating-pipe sections for interphase, horizontal-connecting, and vertical sec-tionsda;

• Operating-mechanism components, such as handle, rod guides, and couplings—each tagged and keyed to the bill of material for ready identifi cation.

In addition to this instruction sheet, a detailed erection drawing (ED) is included, illus-trating the applicable mounting arrangement. A sample is shown in Figure 2.

The erection drawing (ED) shows minimum or suggested locating dimensions for the vertical operating-pipe rod guides, the bell-crank, and the operating handle assembly. The actual locations of these components are to be determined either by qualified persons at the site or by the user’s engineering department.

d Not furnished with switches ordered “less operating pipe.”

a If desired, the pipe can be cut to length (if not precut at the factory) before proceeding to the job site. Cutting dimensions are shown on the erection drawing (ED).

Figure 2. Typical erection drawing (ED).

761-5757

PREPARING SWITCH FOR INSTALLATION

Standard Minor Modifi cations

The erection drawing (ED) also indicates the Standard Minor Modifi cations available for the Standard Mounting Arrangement. The components included with these modifi cations are shown on the erection drawing (ED) bill of material under the specifi ed “-SX” suffi x. They include:

-S1 One tubular fi berglass insulating section in vertical operating shaft

-S2 One Cypoxy® insulator unit in vertical operating shaft

-S3 Insulated interphase sections and one tubular fi berglass insulating section in vertical operating shaft

-S4 Insulated interphase sections and one Cypoxy insulator unit in vertical operating shaft

-S5 Two-inch IPS pipe—required for rotating-type operating mechanism vertical shaft when such shaft exceeds three 109– 40 sections

-S6 Key interlock—single lock for “locked-open” application

-S8 Provision for power operation of pole-mounted switches by S&C Switch Opera-tor—Type AS-1Ad

Drawing RD-1330 OR RD-3158R2, detailing the various modifications, is included in addition to the erection drawing (ED).

Power Operation If suffi x “-S8” is specifi ed, S&C Instruction Sheets 769-510 and 769-511, “S&C Switch Operators—Type AS-10,” are included with the switch operator shipment. Instruction Sheets 769-510 and 769-511 cover installation, operation, and adjustment of the switch operator and should be used in conjunction with this instruction sheet where applicable.

d Not all mounting arrangements are suitable for power operation, consult your nearest S&C Sales Office for availability.

761-575 8

INSTALLATION

Mounting to Wood

NOTICEWhen mounting to a wood structure, a spring-type washer must be used between the square washer and the nut, to maintain fastener tightness in the event of wood shrinkage. See Figure 3.

Figure 4. Assembling pipe coupling to operating lever—interphase pipe on both sides of operating lever.

Operating leverPipe coupling

Figure 5. Assembling pipe coupling to operating lever—interphase pipe on one side of operating lever.

Operating leverPipe coupling

Figure 3. Applying spring washer.

Spring-typewasher

Uncrating the Switch

Step 1

Remove the switch poles and bell-crank base(s) or bracket(s), if applicable, from their crates and arrange them on the ground in the same order in which they will be mounted on the structure. Protect the bearings from contamination by dirt, mud, oil, etc. If necessary, use blocks to keep the bearings clear of the ground.

Attaching Couplings to Switch Poles

Step 2

Attach pipe couplings to the operating lever of each switch pole. Each pipe coupling includes ¹⁄₄-inch and ³⁄₈-inch spacers. Position the spacers, included with each coupling, as shown in the section views on the erection drawing (ED). See Figures 4 and 5.

761-5759

INSTALLATION

Attaching Bell-Crank

Step 3

Attach the bell-crank assembly to its base or bracket (pole-mounted arrangements only). See Figure 6.

Attaching Couplings to Bell-Crank

Step 4

For mounting confi gurations that use a bell-crank mounted between switch poles, the bell-crank will be connected to the interphase pipe by a fl at-bar or pipe-type drag link and an offset coupling. Attach one end of the drag link to the driven arm of the bell-crank. Attach the offset coupling to the other end of the drag link. See Figure 7.

Figure 6. Attaching bell-crank assembly.

Figure 7. Typical outboard bearing confi guration, vertically mounted between switch poles.

Offset coupling

Drag link

Driven arm of bell-crank

761-575 10

INSTALLATION

Lifting the Switch

Ç CAUTIONDo not lift the switch by rigging to the “live parts,” nor subject these parts to undue stress from slings or fall lines. Misalignment of the contacts and the interrupters may result from improper handling.

Step 5

Hoist the switch poles and bolt them into position as shown on the erection drawing (ED). See Figure 8.

Ç CAUTIONMake sure that the surfaces on which the switch pole bases are mounted are fl at and true. Mounting to an uneven surface can cause the bases to twist, placing undue strain on the insulators and throwing the blades out of alignment, resulting in diffi culties operating the switch. Use shims as required.

Figure 8. Hoisting switch pole into position.

Figure 9. Hoisting bell-crank into position.

Step 6

Hoist the bell-crank assembly, including base or bracket, and bolt it into position as shown on the erection drawing (ED). See Figure 9.

761-57511

INSTALLATION

Step 7

To minimize time-consuming fi nal adjustments, make sure that the switch is fully closed. Tie the switch blades to their stationary main contacts. See Figure 10.

Step 8

Make sure that the bell-crank is held in the 45-degree position. The bell-crank and bell-crank bearing have indexing ridges to facilitate alignment. See Figure 11.

Tie

Figure 10. Tieing switch blade to main contacts.

Figure 11. Bell-crank in 45-degree position.

45-degree position marks

761-575 12

INSTALLATION

Installing Pipe Couplings with Piercing Set Screws

Ç WARNINGFailure to properly install pipe couplings with piercing set screws can cause slippage of operating pipe, resulting in improper operation of the switch, arcing, equipment damage, or electrical shock.

To properly install piercing set screws:

1. Make sure that the cutting tip of the piercing set screw does not protrude through the body of the clamp.

2. Insert the operating pipe section into the coupling and fi nger-tighten the clamp bolt(s).

3. Adjust the operating pipe to the correct length. Then tighten the clamp bolt(s) to fi nal tightness.

4. Tighten the piercing set screw, piercing the pipe, and continue turning until a fi rm resistance is felt.

5. Make sure that the clamp bolt(s) are tight.

See Figure 12.

Coupling body

Clamp bolt

Piercing set screw

Piercing set screw in shipping position (cutting tip does not protrude through body of the clamp)

Clamp

Slug pierced from pipe

Operating pipe installed, clamp bolt fully tightened, and piercing set screw in fi nal position

Figure 12. Installing pipe couplings.

761-57513

INSTALLATION

Installing Interphase Pipe

Step 9

Install the pipe sections connecting the switch poles and the bell-crank assembly. See Figure 13. Follow the directions in “Installing Pipe Couplings with Piercing Set Screws” on page 12.

Torque the clamp bolt of each pipe-coupling clamp to final tightness, but do not tighten the associated piercing set screw, until so directed in Step 24 beginning on page 21, after the mechanism has been adjusted to attain full closure of all three poles.

Interphase pipe sections

Figure 13. Pipe connecting switch poles.

Driven arm of bell-crank

Connecting pipe

Figure 14. Pipe connecting bell-crank.

Step 10

If the bell-crank is mounted outboard of the switch poles, install the pipe section connecting the driven arm of the bell-crank to the nearest switch pole. See Figure 14. Follow the directions in “Installing Pipe Couplings with Piercing Set Screws” on page 12.

Torque the clamp bolt of each pipe-coupling clamp to final tightness. Then tighten the associ-ated piercing set screw, piercing the pipe, and continue turning until a firm resistance is felt.

761-575 14

Step 11

If the bell-crank is mounted between switch poles, connect the drag link to the interphase pipe, using the offset coupling previously attached to the drag link in Step 4. See Figure 15. Follow the directions in “Installing Pipe Couplings with Piercing Set Screws” on page 12.

Torque the clamp bolt of each pipe-coupling clamp to final tightness. Then tighten the associ-ated piercing set screw, piercing the pipe, and continue turning until a firm resistance is felt.

INSTALLATION

Installing Vertical Operating Pipe

Step 12

One of the pipe sections furnished is threaded at one end to accommodate the operating handle assembly. See Figure 16. Install this section of pipe last, with the threads at the lower end.

If only one vertical operating-pipe section

is required, proceed to Step 15.

Interphase pipe

Drag link

Figure 15. Connecting drag link to interphase pipe.

Figure 16. Threaded vertical operating pipe.

761-57515

INSTALLATION

Step 13

Mount the rod guide(s) with the arm pointing upward as shown in Figure 17.

When an adjustable rod guide is included mount it nearest the switch.

Step 14

Install the upper section of vertical operating pipe between the bell-crank and the uppermost rod guide, with the rod-guide arm pointing upward at a 45-degree angle. See Figure 18. (A positioning stud is furnished which holds the rod guide at 45 degrees.) Follow the directions in “Installing Pipe Couplings with Piercing Set Screws” on page 12.

Torque the clamp bolts to final tightness. Then tighten the piercing set screws, pierc-ing the pipe, and continue turning until a firm resistance is felt.

If more than one rod guide is used, install vertical operating-pipe sections between the rod guides in the same manner.

Figure 17. Attaching rod guide.

Figure 18. Installing upper operating pipe section into rod guide.

Positioning studPositioning stud

Uppermost section of vertical operating pipe

761-575 16

Installing Operating Handled

Step 15

Mount the operating handle assembly as shown on the erection drawing. At the same time, use one of the mounting bolts to attach one end of the ground strap (the end with the grounding connector attached) to the handle mounting plate.f See Figure 19.

INSTALLATION

Step 16

Install the lowest vertical operating-pipe section by threading one end of the pipe into the coupling on the operating handle assembly. Approximately ¹⁄₄ inch of thread should extend through the coupling. Tighten the locknut. See Figure 20.

d If suffix “-S8” is specified, refer instead to S&C Instruction Sheet 769-510, “S&C Switch Operators — Type AS-10.”

f The grounding recommendations herein may differ from the standard operating and safety procedures of cer-tain electric utility companies. Where a discrepancy exists, the operating procedures of the electric utility apply.

Figure 19. Mounting operating handle.

Grounding strap

Figure 20. Installing lowest operating pipe section into operating handle assembly.

Locknut

761-57517

INSTALLATION

Step 17

Insert the upper end of this pipe section in the lowest rod guide or—if only one vertical operating-pipe section is used—the bell-crank coupling and, while holding the operating handle at a point approximately 20 degrees from the closed position, torque the rod guide (or bell-crank) coupling clamp bolt. See Figure 21.

NOTICEDo not tighten the piercing set screw at the top of the lowest section of vertical operating-pipe until satisfactory operating handle adjustment is attained.

Step 18

Fasten the free end of the grounding strap to the lowest vertical operating-pipe section a few inches above the operating handle assembly with the U-bolt connector provided for this purpose. See Figure 22. Then connect the lower

end of the strap to a suitable earth ground,

using the grounding connector provided at

that end of the strap.f

f The grounding recommendations herein may differ from the standard operating and safety procedures of cer-tain electric utility companies. Where a discrepancy exists, the operating procedures of the electric utility apply.

Figure 21. Installing lowest operating pipe section into rod guide.

Lowest section ofvertical operating pipe

Figure 22. Attaching grounding strap.

Groundingstrap

U-bolt connector

761-575 18

Checking Alignment

Step 19

Remove the ties holding the switch blades to their stationary main contact assemblies. See Figure 23.

Remove the 45-degree positioning stud from each rod guide. See Figure 18 on page 15.

Open and close the switch slowly to ensure that no operational difficulties are encountered due to undetected damage in shipping.

Ç CAUTIONThe switch should be opened and closed slowly only when checking for alignment and complete closure.

When opening or closing the switch in service, do not slow down or stop part way. Arcing can occur if the switch is partially open or partially closed.

Step 20

Move the operating handle slowly to the closed position. See Figure 24. A defi nite resistance should be felt at the end of the stroke, indicating that all slack in the operating linkage has been taken up.

Tie

Figure 23. Removing tie at stationary main contact assembly.

Figure 24. Verifying slack has been taken up in operating linkage.

INSTALLATION

761-57519

Step 21

If there is still slack, repeat the procedure in Step 17 but move the operating handle more than 20 degrees in the opening direction before torquing the clamp bolt on the lowest rod guide (or bell-crank) coupling. See Figure 25.

Conversely, if considerable force is needed to move the handle to the fully closed position, or if the handle does not swing 180 degrees to the fully open position, loosen the clamp bolt on the lowest rod guide (or bell-crank) cou-pling, and move the handle to a position less than 20 degrees from the closed position. Then torque the clamp bolt on the lowest rod guide (or bell-crank) coupling. Proper “resistance” in the operating linkage is essential to ensure positive switch closure.

If a key interlock is not used (Standard Minor Modification Suffix “-S6”) proceed to Step 24 on page 21.

Figure 25. Torquing clamp bolt at lowest rod guide (or bell-crank) coupling.

Clamp bolt

INSTALLATION

761-575 20

INSTALLATION

Installing Key Interlock

Step 22

The interlock group includes a Superior Type B4003-1 Mk II single- or multiple-key interlock (or equivalent), with zero bolt projection and ³⁄₄-inch bolt travel, locking disc, and interlock bracket. If “provision only” is specifi ed, the interlock is not included.

Attach the key interlock to the interlock bracket so that the interlock bolt, when extended, engages a slot in the locking disc on the operating handle. See Figure 26.

Step 23

Block one of the two slots in the locking disc with the blocking screw provided. (The slot to be blocked depends on whether a locked-open or locked-closed arrangement is required.) See Figure 27.

NOTICEKey interlocks are intended for proper sequencing of switch operations; they are not intended to provide security. The operating handle assembly includes a locking bar for padlocking the switch in either the open or closed position.

Figure 26. Attaching key interlock to interlock bracket.

Locking disc

Interlock bolt

Figure 27. Blocking slot in interlock disc.

Blocking screw

761-57521

INSTALLATION

Checking Operation

Step 24

Open and close the switch slowly through its full travel.



Check to be sure that the following condi-tions exist:

With the operating handle as far as it will go in the closing direction, all main contacts of the interrupter switch are fully closed with the blades against their blade stops. See Fig-ure 28.

Each switch-pole operating lever should lie against its closed stop. See Figure 29.

Figure 28. Checking that main contacts are fully closed.

Blade stop

Blade

Main contacts fully closed

Switch-poleoperating lever

Stop bolt

Figure 29. Verifying that switch-pole operating lever is within ¹⁄₁₆-inch of the closed stop bolt.

761-575 22

INSTALLATION

If none of the switch poles are fully closed, increase the effective length of the vertical operating pipe as follows.

Loosen the vertical operating-pipe clamp bolt on the lowest rod guide (or bell-crank) coupling. See Figure 30.

Move the operating handle approximately 20 degrees from the closed position and then torque the rod guide (or bell-crank) coupling clamp bolt.

Move the operating handle to the fully closed position and recheck for adherence to the condi-tions described above.

In the unlikely event that only one or two switch poles are fully closed, loosen the clamp bolt(s) on the interphase pipe coupling(s) at the affected switch-pole operating lever and reposition the pipe coupling to increase or decrease the effective length of the interphase operating pipe. Torque the clamp bolt of each pipe-coupling clamp to final tightness. Tighten the associated piercing set screws, piercing the pipe, and continue turning until a firm resis-tance is felt. See Figure 31.

Figure 30. Increasing effective length of vertical operating pipe.

Clamp bolt

Lowest section of vertical operating pipe

Pipe couplings

Clamp bolt

Figure 31. Readjusting interphase pipe.

761-57523

INSTALLATION

With the operating handle as far as it will go in the opening direction, the switch blades are 90 degrees from the closed position. See Figure 32.

In the unlikely event that the above-described conditions are not met, more switch blade travel is required.

Move the operating handle to its mid-posi-tion to take the strain off the operating-pipe linkage and loosen the two bolts that clamp the driving arm of the adjustable bell crank. See Figure 33.

Shorten the drive arm of the adjustable bell crank one step (¹⁄₈ inch) and retighten the bolts. Shortening the drive arm increases switch-blade travel. Then readjust for full operating handle travel as described in Steps 19 and 20 on page 18.

Repeat this procedure—shortening the driv-ing arm of the adjustable bell crank in one-step increments and readjusting for full operating handle travel—until full switch-blade travel is attained.

When satisfactory travel adjustment of the operating handle and switch have been attained, torque the bolts on the driving arm of the adjust-able bell crank to final tightness.

NOTICEAfter readjusting, be sure to retighten the clamp bolt and piercing set screw on the pipe coupling at the rod guide (or bell-crank) coupling immediately above the operating handle, the clamp bolts and piercing set screws on the interphase pipe couplings, and the clamp bolts on the driven arm of the adjustable bell crank.

90°

Figure 32. Checking that switch blades are 90 degrees from closed position.

Figure 33. Shortening drive arm of adjustable bell crank.

Clamp boltsDriving arm

761-575 24

INSTALLATION

Step 25

Open and close the switch slowly several times.



Check the operation of each switch pole. The following conditions must be met:

As the blade moves in the closing direction, clearance between the blade opening cam and the interrupter opening lever must be within the limit shown. See Figure 34.

As the blade assembly moves in the closing direction, each blade closing cam must make positive engagement with its respective inter-rupter closing lever. See Figure 35.

Figure 34. Blade assembly moving in closing direction.

⁵⁄₁₆ maximumOpening cam

Blade

Opening lever

Figure 35. Blade assembly moving in closing direction.

Closing lever Blade

Interrupter

Closing cam

761-57525

INSTALLATION

Figure 36. Blade assembly in fully closed position.

Closing lever Blade closed

Interrupter

Closing cam

¹⁄₈� maximum

When the blade is in the fully closed posi-tion, each blade closing cam must overlap its respective interrupter closing lever to prevent inadvertent opening of the interrupter, and clearance between the blade closing cam and its respective interrupter closing lever must be within the limit shown. See Figure 36.

The interrupter must lie in a plane parallel to the sweep of the blades, and the blades must pass over the interrupter with approximately equal clearance on both sides. See Figure 37.

If adjustment is required, loosen the nuts that fasten the interrupter to the jaw-contact assembly and shift the interrupter, within the confines of the mounting holes, to achieve the necessary clearances. Retighten the nuts.


Adjust for equal clearance

Blade assemblyInterrupter

761-575 26


Blade closed

Interrupter

³⁄₈� minimum shunt contact to interrupter housing

Shunt contact

¹⁄₁₆� minimum shunt contact to interrupter skirts

Figure 39. Blade assembly moving in opening position.

Blade closed

Interrupter

Shunt contact

Interrupter contact rivets

With the switch in the fully closed position, verify the minimum clearances between the blade shunt contact and the interrupter, mea-sured to the interrupter housing as well as the interrupter skirts. See Figure 38.

Move the blade in the opening direction and verify that each blade shunt contact firmly engages its respective interrupter contact rivets before the blade contacts disengage from the stationary main contact assemblies. See Figure 39. The shunt contacts may be bent as required to conform to these conditions.

If any of the conditions described in this step cannot be achieved, contact the nearest S&C Sales Office since it is likely that damage was sustained during shipment.

INSTALLATION

761-57527

Step 26

Attach the danger label to the pole or structure using two straps or bolts (furnished by others). See Figure 40.

Position the danger label within three feet of the switch pole-units, and in full view of line crews when viewed from the front of the switch.

For switches that mount on two poles, attach another danger label to the second pole in the same manner.

Connecting High-Voltage Conductors

When high-voltage conductors are to be connected using aluminum-alloy body connectorsf , the following procedures should be employed:

• Thoroughly wire-brush the current-transfer surfaces of each connector and immediately apply a liberal coating of Penetrox® A (available from Burndy Corporation) to the brushed surfaces.

• Wire-brush each terminal pad of the switch and apply a coating of Penetrox A. Then bolt the connectors to the terminal pads.

• Prepare the conductors using established procedures and clamp them in their respective connectors.

f “Mass anode” type connectors, such as the Catalog Number 5300 series offered by S&C, which have been designated by the connector manufacturer as being suit-able for direct attachment to copper-bearing alloy terminal pads.

Straps(by others) Danger label

Figure 40. Attaching danger label to pole or structure.

INSTALLATION

761-575 28

Prin

ted

in U

.S.A

.

Opening and Closing the Switch

Ç DANGERThe interrupters and terminal pads of the Alduti-Rupter Switch may be energized with the interrupters in any position. Before inspecting, servicing, or repairing this switch or working on the conductors on either side of the switch, test for voltage using proper high-voltage test equipment. Then install suitable grounding equipment. Failure to observe these precautions may result in serious injury or death.

NOTICEThis interrupter switch is not intended for breaking fault currents.

Remove the padlock from the locking bar on the operating handle assembly. Withdraw the locking bar. See Figure 41.

If the operating handle assembly is furnished with a key interlock, disengage the interlock bolt.

Rapidly swing the handle to the fully open or fully closed position. See Figure 42.

Always check that all three poles are fully open or fully closed.

Replace the locking bar and the padlock. Engage the key interlock, if applicable.

Ç CAUTIONWhen opening or closing the switch do not slow down or stop part way. Arcing can occur if the switch is partially open or partially closed.

Figure 41. Withdrawing locking bar and disengaging key interlock bolt.

Figure 42. Rapidly swing the operating handle.

OPERATION

s&c alduti-rupter switches - s&c electric company...crank mounted between switch poles, the...

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