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TRANSCRIPT
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TYPES
IFC66A IFC66B IFC66K
INSTRUCTIONS
TIME OVERCURRENT RELAYS
GENERAL f/j ELECTRIC
GEK-45376B Supersedes GEK-45376A
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GEK-45376
CONTENTS
PAGE
DESCR IPT I ON.... . . . .... . . . . .. . . . ... . . .. . .. . .. . .. . .. .... . .. . . . . .. . . . .. . . . . .. 3 APPL ICAT I ON . . .. . ... . . .. . . . . . .. . . . . . . . . . .... .. . .. . . . . ... . . . . . . . . . . . . .. . . . . . 3
CONSTRUCT I ON. . . . . . • . • • • . . . . . . . . . . . . . . . . . . . . . • • . . . . . • . . . • . • . . . . . . . • • • • . • • . . 4
RAT INGS... .. . ...... .... . . . ..... .. . . .. .. . . .... .. . . ... . ........... ... . . .. .. . 5 T IME OVERCURRENT UN I T. . • • • • • • • • • . • • • • • . . . • . • . . . • • • . • • . • . . . . • • . • • • • . . • • 5
H I - S E I SM IC INSTANTANEOU S UN IT. . . . .. . . . . .. .. . . . . ..... . . . . . .. . .. . . . ... .. 5
H I - S E I SM IC H IGH D ROP OUT INSTANTANEOU S UNIT .. . . . . . . . . . .. .. . . . . . .. .. .. 6
H I -SE I SM IC TARGET AND SEAL - IN UN I T. .. ..... . . . ....... . . ...... . . . . . .. . . . 6
CONTACTS. .. . .. .. . . .. . . . .. .. . . . . . . .. .. .. .. . . . .. .. .. ... . . . .... . . . . ...... 7
BURDENS. . ...... ... . . .. ..... . .. . . .... . .. .. . ... . . ... . . .. . . . . . . .. . . . . . . ... . . . 7
CHARACTE R I ST ICS... . ... ... ... . .. .. ..... . . . . . .. . .. . . .. .. .. . . . . . . . . . . . . . . ... . 8
TIME OVERCURRENT UN I T.. .. . . . . . . . . . . . . . . . ... . ... . . . . ... . . .. .. . . . .. .. . .. 8
H I - S E I SM IC INSTANTANEOUS UN IT. .. .. . . ... ... .. ...... . .. . . .. .. . . . . . . . . . .. 9
H IGH DROP OUT INSTANTANEOUS UN I T. . . . . . . . . . . . .. . . .... ... . .. . .. . . . . .... . 9
H I - S E I S M IC TARGET AND SEAL- IN UN I T. . .. . . ... . . .. . . . . . . . . .. . .. . . . . . . . . . . 9
REC E I V ING, HANDL ING AND STORAGE. . . . . .. . ... . . . . .... . . . . . . .. .. . . . . . . . . ... ... 9
ACCEPTANC E TESTS... . .... . . . .. . . . . . . ... . ..... .. . . . .... . . . .. . ...... . . . . . . ... 9
V I SUAL INSPECT I ON... .. . . . . . .. . . . . . . . . . ... . .. . .. . . . . .. . . . . . . . . . . . . . . . . . 10
MECHAN ICAL INSPECT I ON. .. . . . . . . . . . . .. . . . . . .. . . . .. . . . . . . . . . .. . . . . . . .. . . . 10
DRAWOUT RELAY TEST ING • • • • • • • • . • • • • . . • • • • • • • • • • • • • • • • • • • • • • • . • • • • • • • • • . . 10
POWER REQU I REMENTS G EN ERAL • • • • • • • • • • • • . • • • • • • • . • • • . . • • • • • • • • • • • • • • • . • • • 10
T IME OVERCURRENT UN I T • . • . • • • • • • • • • • • • • • . • • . . • • • • • • • . . • • • • • . • . • • • • • . • • • • 10
H I - S E I SM IC INSTANTANEOUS UN IT .. .. . .. . . .. . . . . . . . . . . . . . . .. ..... . . . . . . ... . 11
H IGH D ROPOUT INSTANTANEOUS UN IT . . . . . ..... ........ . . . ...... .. . . . . .. ... . 11
H I -SE I SM IC TARGET AND SEAL- IN UN I T . . . . . . . . . .. . . . . . .. . . . .. . .. . . . . . .. ... . 11
INSTALLAT I ON.. .. . . . . . . . . . . . . . . .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . .... . . 12
INSTALLAT I ON TESTS • • . • • . . • • • • • • • • • • • . • • • • • • • • • • • . • . • • • • • • • • . . . • • . . • • • . • 12
P ER IODIC CHECKS AND ROUTINE MA INTENANCE. ... . .. . . ... . . . . . . . ....... . . ... ..... 13
T IME OVERCURRENT UN I T .... . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . 13
H I - S E I SM I C INSTANTANEOUS UN I T ... . . . . . . .. . ... .. . . . . . . . . . . .. . .. . . .. ... . . . 13
H IG H DROPOUT INSTANTANEOUS UN IT . • . . • . • . • . . • . . . • . • . • . • • . • • • • • . • • • . . . . . . 13
H I - S E I SM I C TARGET AND S EAL- IN UN I T .. ... .... ... . .. .... . . . . . . . . . . . ... .. . . 13
CONTACT CLEAN ING • . . • • . . . . • . . . . . . • • . . . . . . . • . . . . • . . . • . . . . . . • • . . . . . . . . . . . . 13 COVER CLEAN ING • . • • . . • . . • • • . • • • . . . . . . . . . . . . • • . . . . . . . . . . . . . . . . . . . • . . . . . . . . 13
SYSTEM TEST. . .. . ... . .. . . . • . . . • • . • . . . . . . . • . • . . . . • . . . . • • . . . . . . . • • . . . . . . • . 13
SERV IC ING • . • . • . . . • . . • • • • • • . • . . . . . . . • . • . . . . . . . . . • . . • . • • . • . . . • . . . . • • • • . . . . • . . 14
T I�1E OVERCURRENT UN I T.. . . .. ......... . . . . • . • . . . • • . • . • • • • • • • • . . . • . • • . . • . . 14
H I -SE I SM IC INSTANTANEOUS UN I T AND H IGH DROP OUT INSTANTANEOUS UN I T . . • . • 15
H I -S E I SM IC TARGET AND SEAL- IN UN I T ... . . ....... .... . . . ....... . .. ... ..... 15
RENEWAL PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . • • . . . . . . • . . . • . . • • . . . . . . . • • • . • . . . . . • . 15
L I ST OF F I GURES ... . . . . ... . . . . .. .. . ..... . . . . .... . .. ..... .. .... ... .. . . . .. . . . . 17
Cover (8043003 ) 2
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GE K-4 5 376
TIME OVERCURRENT RELAYS
TYPES IFC66A, IFC66B, IFC66K
D ESCR I PTION The type IFC relays covered by these instructions are singl e-phase time overcurrent rel ays with long
time characteristics, used primari l y for motor protection . Al l three re l ay types incl ude an induction disk time overcurrent unit and a dua l -rated target and sea l -in unit. The IFC66B a lso incl udes a Hi-Seismic hinged-armature instantaneous overcurrent unit with target, mounted in the front of the rel ay. The IFC66K incl udes the Hi- Seismic instantaneous unit in the front, and a l so a high dropout unit a lso with Hi-Seismic capabi l ity mounted in the rear. The high drop-out unit is designed to drop out at 80 percent or more of its pickup setting and does not incl ude a target. Al l units are described in detai l in the section on CONSTRUCTION.
When semifl ush mounted on a suitabl e panel these rel ays have a high seismic capabi lity . Al so, these re l ays are recognized under the Components Program of Underwriters Laboratories, Inc.
The rel ays are mounted in a C l drawout case of mol ded construction . The outl ine and panel dril l ing are shown in Figures 20 and 21 . The rel ay internal connections are for the IFC66A, IFC66B and IFC 66K are shown in Figures 3, 4 and 5 respective l y.
APPLICATION
Time overcurrent rel ays are extensivel y used for protection on util ity and industria l systems. The l ong-time inverse characteristic of the IFC66 fami l y is useful for overl oad protection on l arger medium vol tage motors and as l ong-time back-up protection on medium-vol tage industrial systems.
The principa l appl ication of the IFC66A and IFC66B rel ays is for motor protection. The l ong-time characteristic �f the induction disk unit provides sufficient time to prevent operation on motor starting current. In this appl ication the rel ay settings are frequent l y determined by National E l ectric Code requirements as wel l as by consideration of the motor thermal heating and starting characteristics . The instantaneous unit in the IFC66B if used must be set above l ocked rotor current. To account for the transient overreach of the instantaneous unit a setting of twice-l ocked rotor current is usual l y recommended. More precise settings can be made by using the transient overreach curves in Figure 11.
The IFC66A and IFC66B rel ays are a l so useful for appl ication on the primary of a smal l l ow vo l tage l oad center transformer when the secondary main protective device is an insul ated case circuit breaker. In such cases the l ong time capabil ity permits the re l ay to be set se l ectivel y with the non-adjustabl e l ong-time thermal el ement of the l ow vol tage breaker. The instantaneous attachment in the IFC66B is useful in this app l ication onl y when it can be set above the magnitude of current at the rel ay location for a fau l t at the l ow-vo l tage termina l s of the transformer. Typical external connections for the IFC66A and IFC 66B are shown in Figure 8.
The IFC 66K is especial l y suited for motor protection . The rel ay is simi l ar to the IFC66B except that a second instantaneous overcurrent unit, with a high dropout characteristic, is incl uded. The purpose of this high dropout instantaneous unit is to provide discr1mination between motor running overl 0ad and l ocked rotcr current . This is accompl ished by setting pickup of the high drop-out unit ( 50/B) between motor ful l l oad current and l ocked rotor current, as i l l ustrated in Figure 9, with the normal jropout instantaneous unit ( 50/A ) set above l ocked rotor current . The time overcurrent unit must coordinate with the motor thermal l imit . Typical settings to accompl ish this are l isted in the fol l owing tabl e:
Unit Pickup Setting Mul tipl es of Ful l Load Current
Time Overcurrent Unit 5 1 1 . 1 5 to 1 . 4 Normal Dropout Instantaneous 50/A 8 to 15
Overcurrent Unit High Dropout Instantaneous 50/B 2 to 3
Overcurrent Unit
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GEK-45376
The user must determine the specific settings which will provide the required protection for his �achine, and select a relay model having the operating ranges needed to obtain these settings.
With settings as illustrated in Figure 9 and external connections shown in Figure 10, the operation of �"" IFC66K relay will be as follows:
1. For motor overloads the time overcurrent unit (51) will time out, picking up an external auxiliary 51X, which sounds an alarm.
*2. For the locked rotor condition the high-dropout unit (50/B) will pick up instantaneously and the TOC unit (51) will pick up with a time delay consistent with the motor thermal limit. When both units have operated the breaker will be tripped.
*3. For a fault the normal dropout instantaneous unit (50/A) �ill pick up instantaneously and trip the breaker.
When used as back-up protection, the time overcurrent unit IFC66 should be set to coordinate with downstream protective devices. A minimum coordinating time margin of 0.2 to 0.4 seconds will normally be required. The following factors must be considered in determining a setting:
• Operating time of the downstream relay and breaker
• Overtravel in the induction disk unit
• A safety factor to allow for variations in system parameters from the values used to determine the relay setting.
Relay overtravel is often considered to be less than 0.1 second; exact values can be read from Figure 11. Typical safety factors range from 0.1 to 0.2 seconds.
CONSTRUCTION
The IFC induction disk relays consist of a molded case, cover, support structure assembly, and a connection plug to make up the electrical connection. See Cover Figure and Figures 1, 2 and 19. Figure 2 shows the induction unit mounted to the molded support structure. The disk is activated by a current operating cr�, mounted on a laminated U-Magnet. The disk and shaft assembly carries a moving contact which completes t larm or trip circuit when it touches a stationary contact. The disk assembly is restrained by a spiral spr1ng to give the proper contact closing current. The disk's rotation is retarded by a permanent magnet mounted in a molded housing on the support structure.
The drawout connection/test system for the Cl case, shown in Figure 19, has provisions for 14 connection points, and a visible CT shorting bar located up front. As the connection plug is withdrawn, it clears the shorter contact fingers in the output contact circuits first. Thus, the trip circuit is opened before any other circuits are disconnected. Next, current circuit fingers on the case connection block engage the shorting bar (located at the lower front of the case) to short-circuit external current transformer secondary connections. The window provides visual confirmation of CT shorting. The connection plug then clears the current circuit contact fingers on the case and finally those on the relay support structure to completely de-energize the drawout element.
There is a Hi-Seismic target and seal-in unit mounted on the front to the left of the shaft of the time overcurrent unit, see Figure 1. The seal-in unit has its coil in series and its contacts in parallel with the contacts of the time overcurrent unit such that when the induction unit contacts close, the seal-in unit picks up and seals in. When the seal-in unit picks up, it raises a target into view which latches up and remains exposed until released by pressing a reset button located on the upper side of the cover. t
The IFC "B" and "K" model relays in addition to the above contain a Hi-Seismic instantaneous unit, see Figure 1. The instantaneous unit is a small hinged type unit which is mounted on the front to the right of the shaft of the time overcurrent unit. Its contacts are normally connected in parallel with the contacts of the time overcurrent unit and its coil is connected in series with the time overcurrent unit. When the instantaneous unit picks up it raises a target which latches up and remains exposed until it is released. The same reset button that releases the target seal-in unit also releases the target of the instantaneous unit.
The IFC "K" model relays in addition to the above contain a Hi-Seismic dropout instantaneous unit. The high dropout instantaneous unit is a small hinged type mounted in the rear of the relay, see Figure 2. Unlike the Hi-Seismic instantaneous unit, this unit does not include a target and therefore does not have to be rP-set after it operates.
,� magnetic shield, depicted in Figure 1, is mounted to the support structure, to eliminate the proximity affect of external magnetic materials.
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Gt:K-45376
Both the Hi- Seismic target and sea l -in unit and the Hi- Seismic instantaneous unit have the letters "HiG" mo l ded into their target block to distinguish them as Hi-Seismic units . Seismic fragility leve l exceeds peak axia l acceleration of l Og's ( 4g Z PA ) when tested using a biaxia l mul ti -frequency input motion to produce a Required Response Spectra ( RRS ) in accordance with the I EEE Proposed Guide for Seismic Testing of Relays, P501, May, 1977.
RAT INGS
The re l ays are designed for operation in an ambient air temperature from -200C to + 5 5oc .
T IME OV ERCURRENT UN IT
Range for the time overcurrent unit is shown in Tab l e 1. TABLE 1
Frequency Current Range Relay ( Hertz ) (Amperes )
I FC66A, B& K 50 and 60 2.5 - 7.5
Avai l ab l e taps for the time overcurrent unit are shown in Table 2.
TABLE 2
Range Taps Available (Amperes ) (Amperes )
2 . 5 - 7 . 5 2.5, 2 . 8, 3 . 0, 3.5, 4.0, 4.5, 5.0, 5.5, 6 . 0, 6.5, 7.5
The one second therma l ratings are listed in Tab l e 3.
TABLE 3
Mode l Time Overcurrent Unit One Second Ratin) Any Tap K (Amperes ) (Amperes
IFC66A,B&K 2. 5-- 7 . 5 350 122 500
Ratings less than one second may be ca l cu l ated according to the formu·la I =v' K/T, where T is the time in seconds that the current f l ows .
The continuous ratings for the time overcurrent unit ar.e shown in Table 4.
TABLE 4
2 . 5 - 7 . 5 Ampere Range Ratings
Mode l I FC66
Tap 2 .5 2 . 8 3.0 3 .5 4 . 0 4 . 5 5.0 5.5 6 . 0 6 .5 7.5
Continuous Current 5.0 5.3 5 .5 5 . 8 6 . l 6 . 4 6 . 8 7 . 0 7 . 3 7 . 5 8 .0
H I -SE I SM I C I NSTANTANEOUS U N I T
The instantaneous coi l is tapped for operation on either one of two ranges ( H o r L). Sel ection of the high or l ow range is determined by the position of the l ink l ocated on the top of the support structure . See Figure 2 and Tab l e 5 .
Since the instantaneous unit coi l is in series with the time overcurrent unit coi l , see Tab l es 3,4, 5 1nd 6 to determine the current limiting e l ement for both continuous and short time ratings .
* indicates revision 5
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G!:K-45376
TABLE 5
Hi-Seismic * Continuous **One Instantaneous Link Second
Position Range Rat in) Unit (Amps) (Amps) (Amps Rat in}
(Amps 2 - 50 L 2 - 10 3.7
130 H 10 - 50 7.5
6 - 150 L 6 - 30 10.2 260
H 30 - 180 19.6
*The range is approximate, which means that the 2-10, 10-50 may be 2-8, 8-50. one ampere overlap between the maximum L setting and the minimum H setting. select the higher range, since it has the higher continuous rating.
K
16,900
67,600
There will always be at least Whenever possible, always
**Higher currents may be applied for shorter lengths of time in accordance with the formula:
I = f K/T
HI-SEISMIC HIGH DROPOUT INSTANTANEOUS UNIT
The high drooout instantaneous unit is tapped for operation on either of two ranges (H or L) . Selection of the high or low range is accomplished by means of a movable lead located in the rear of the relay.
TABLE 6
Unit Tap *Range Continuous **One K Position Rating Second
(Amps) RatinJ (Amps
L 2 - 4 3.7 2 - 8 130 16900
H 4 - 8 4. 8
*The range is approximate which means that the 2-4, 4-8 may be 2-5, 4-8. ampere overlap between the maximum L setting and the minimum H setting. range, since it has the higher continuous rating.
There will always be at least one Whenever possible select the higher
**Higher currents may be applied for shorter lengths of time in accordance with the formula:
I = r'KiT Since the high dropout unit coil is in series with the time overcurrent unit coil and the Hi-Seismic
instanta�eous unit coil, see Tables 3, 4, 5 and 6 to determine the current limiting element for both continuous and short time ratings.
HI-SEISMIC TARGET MlO SEAL-IN UNIT
Ratings for the target and seal-in unit are shown in Table 7.
* ind�cates revision 6
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GEK-45376
TABLE 7
Tap
0.2 2
D. C. Resistance : 10% (ohms) 8.0 0.24
Min. Operating (Amp. ) +0 -60% 0.2 2. 0
Carry Continuous (Amperes) 0.3 3
Carry 30 Amps for (Sec. ) 0.03 4
Carry 10 Amps for (Sec. ) 0.25 30
60 Hz Impedance (Ohms) 68.6 0. 73
If the tripping current exceeds 30 amperes an auxiliary relay should be used, and the connection being such that the tripping current does not pass through the contacts or the target and seal-in coils of the protective relay.
CONTACTS
The current-closing rating of the contacts is 30 amperes for voltages not exceeding 250 volts. The current-carrying rating is limited by the ratings of the seal-in unit.
BURDENS
Burdens for the time overcurrent unit are given in Table 8.
TABLE 8
Min. Burdens at Min. Burdens in Ohms {Z) Model Hz Range Tap Pickup Min. Tap Times Pickup
Amps (Ohms)
R Jx z 3 10 20
IFC66 so .085 .307 .318 .153 .081 .063 2.5 - 7.5 2.5
60 . 102 . 368 . 382 .183 .097 .076
Note: The impedance values given are those for minimum tap of each range, the impedance for other taps at pickup current (tap rating) varies inversely (approximately) as the square of the tap rating. For example, an IFC66 60 Hz relay with 2.5 - 7. 5 amp r�nge has an impedance of 0. 382 ohms on the 2.5 amp tap. The impedance of the 5. 0 amp tap is (2.5/5. 0) x 0.382 = 0.096 ohms.
The Hi-Seismic instantaneous unit burdens are listed in Table 9.
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GEK-45376
TABLE 9
Hi- Hz Link Range Min. Burdens at Min. Burdens In Seismic Position (Amps) Pickup Pickup (Ohms) Ohms (Z) Inst. Unit (Amps) Times Pickup
(Amps) R Jx z 3 10 20
L 2-10 2 0.750 0.650 0.992 0. 634 0.480 0. 457 2-50 60 H 10-50 10 0.070 0.024 0.074 0.072 0.071 0.070
6-150 60 L 6-30 6 0.110 0. 078 0.135 0.095 0.081 0.079
H 30-150 30 0.022 0. 005 0.023 0.022 0.022 0.022
L 2-10 2 0.625 o·. 542 0.827 0.528 0.400 0. 380 2-50 50 H 10-50 10 0.058 0.020 0.062 0.060 0.059 0.058
L 6-30 6 0.092 0.065 0. 112 0.079 0.068 0.066 6-150 50 H 30- 150 30 0. 018 0.004 0.019 0.018 0.018 0.018
The Hi-Seismic high drop-out instantaneous unit burdens are listed in Table 10.
Hi-Seismic High Drop out Inst. Unit (Amps)
2-8
2-8
T IME OVERCURRENT UNIT
Pickup
Hz
60
50
Movable Range Lead (Amps) Position
L 2-4
H 4-8
L 2-4
H 4-8
TABLE 10
Min. Burdens at Min. Burdens In Pickup Pickup (Ohms) Ohms (Z) Amps Times Pickup
R Jx z 3 10 20
2 0.69 0.62 0. 93 0.55 0.4 1 0.38
4 0.30 0.22 0.37 0.25 0.21 0. 20
2 0.58 0.52 0.78 0.46 0.34 0. 32
4 0. 25 0.18 0. 31 0. 21 0.18 0. 17
CHARACTERIST ICS
Pickup in these relays is defined as the current required to close the contacts from the 0.5 time-dial position. Current settings are made by means of two movable leads which connect to the tap block at the top of the support structure, see Figure 1. The tap block is marked A through M. See the nameplate on the relay for tap settings.
Example:
The 5 amp tap for a 2.5 to 7.5 IFC66 time overcurrent relay requires one movable lead in position 0 and the other in position J.
Operating Time Accuracy
The IFC relays should operate within �7 percent of the published time curve. Figures 6 and 7 show the various time-current characteristics for the IFC relays. The setting of the time dial determines the length of time required to close the contacts for a given current. The higher the time-dial setting the longer the operating time.
The contacts are just closed when the time dial is set to zero. The maximum time setting occurs when the time dial is set to 10 and the disk has to travel its maximum distance to close the contacts.
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GEK�45376
Reset
Tne unit resets at 90 percent of the m1n1mum closing current. Reset times are proportionate to the time-dial settings. The time to reset to the number 1 0 time-dial position when the current is reduced to zero is approximately 75 seconds for the IFC66 relays.
HI -SEISMIC INSTANTANEOUS UNIT
The instantaneous unit has a 25-to-l range with a tapped coil. There are high and low ranges, selected by means of a link located on the top of the support structure. See Figure l. The time-current curve for the instantaneous unit is shown in Figure 1 3 .
HIGH DROPOUT INSTANTANEOUS UNIT
The high drooout instantaneous unit has a 4-to-l range with a tapped coil. There are high and low ranges selected by means of a movable lead in the rear of the relay. See Figure 2. The time-current curve is shown in Figure 1 3 .
HI-SEISMIC TARGET AND SEAL-IN UNIT
The target and seal-in unit has two tap selections located on the front of the unit. See Figure 1. RECEIVING, HANDLING AND STORAGE
These relays, when not included as a part of a control panel, will be shipped in cartons designed to protect them against damage. Immediately upon receipt of a relay, examine it for any damage sustained in transit. If injury or damage resulting from rough handling is evident, file a damage claim at once with the transportation company and promptly notify the nearest General Electric Apparatus Sales Office.
Reasonable care should be exercised in unpacking the relay in order that none of the parts are injured or the adjustments disturbed.
If the relays are not to be installed immediately, they should be stored in their original cartons in � a place that is free from moisture, dust and metallic chips. Foreign matter collected en the outside may find its way inside when the cover is removed and cause trouble in the operation of the relay.
ACCEPTANCE TESTS
Immediately upon receipt of the relay an inspection and acceptance test should be made to insure that no damage has been sustained in shipment and that the relay calibrations have not been disturbed. If the examination or test indicates that readjustment is necessary, refer to the section on SERVICING.
These tests may be performed as part of the installation or acceptance tests at the discretion of the user.
Since most operating companies use different procedures for acceptance and installation tests, the following section includes all applicable tests that may be performed on these relays.
VISUAL INSPECTION
Check the nameplate to insure that the model number and rating of the relay agree with the requisition.
Remove the relay from its case and check that there are no broken or cracked parts or any other signs of physical damage.
MECHANICAL INSPECTION
1 . There should be no noticeable friction when the disk is rotated slowly clockwise. The disk should return by itself to its rest position.
2. Make sure the control spring is not deformed nor its convolutions tangled or touching.
3. The armature and contacts of the seal-in unit as well as the armature and contacts of the instantaneous units should move freely when operated by hand, there should be at least l/64 inch wipe on the seal-in and the instantaneous contacts.
4. The targets in the seal-in unit and in the instantaneous unit must come into view and latch when the armatures are operated by hand and should unlatch when the target release button is operated.
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GEK-45376 5. Make sure that the brushes and shorting bars agree with the interna l connections diagram.
6. CAUTION: Shoul d there be a need to tighten any screws, DO NOT OVER TIGHTEN to prevent stripping.
uRAWOUT RELAY TESTING
The IFC rel ays may be tested without removing them from the panel by using the 12XCA11Al four point test probes. The l 2XCA1 1A l four point test probe makes connections to both the re l ay and the external circuitry, 1vhich provides maximum flexibil ity, but requires reasonab l e care since a CT shorting jumper is necessary when testing the re l ay. The CT circuit may a lso be tested by using an ammeter instead of the jumper. See the test circuit in Figure 14.
POWER REQUIREMENTS-GENERAL
•
Al l a l ternat''ing current operated devices are affected by frequency. Since non-sinusoidal waveforms
can be ana lyzed as a fundamental frequency p l us harmonics of the fundamental frequency, it fol l ows that f al ternating current devices (re l ays ) wil l be affected by the appl ied waveform.
Therefore, in order to properl y test a l ternating current rel ays it is essential to use a sine wave of current and/or vol tage. The purity of the sine wave (i. e., its freedom from harmonics ) cannot be expressed as a finite number for any particul ar re l ay, however, any rel ay using tuned circuits, R-L or RC networks, or saturating e l ectromagnets (such as time overcurrent rel ays ) woul d be essential l y affected by non-sinusoidal waveforms. Hence a resistance l imited circuit, as shown in Figures 17-19, is recommended.
TIME OVERCURRENT UNIT
Rotate the time dia l s low ly and check by means of a l am!' that the contacts just close at the zero time dial setting .
The point at which the contacts just c l ose can be adjusted by running t . . . stationary contact brush in or out by means of its adjusting screw .
With the contacts just c l osing at No. 0 time setting, there shoul d be sufficient gap between the �ionary contact brush and its meta l backing strip to insure approximatel y .,32 inch wipe.
The minimum current at which the contacts wi l l just c l ose is determined by the tap setting in the tap bl ock at the top of the support structure. See CHARACTERISTIC section.
The pickup of the time overcurrent unit for any current tap setting is adjusted by means of a springadjusting ring . See Figure 1. The spring -adjusting ring either winds or unwinds the spiral control spring . By t�rning the ring, the operating current of the unit may be brought into agreement with the tap setting empl oyed, if this adjustment has been disturbed. This adjustment a l so permits any desired setting intermediate between the various tap settings to be obtained. If such adjustment is required, it is recommended that the higher tap be used. It shoul d be noted that the rel ay wil l not necessaril y agree with the time current characteristics of Figures 6 and 7, if the re l ay has been adjusted to pick up at a va l ue other than tap val ue, because the torque l evel of the re l ay has been changed.
Time Setting
The setting of the time dial determines the l ength of time the unit requires to c l ose the contacts when the current reaches a predetermined va l ue . The contacts are just cl osed when the time dial is set on 0 .
•
When the time dial is set on 10, the disk must travel the maximum amount to c l ose the contacts and therefore � this setting gives the maximum time setting.
The primary adjustment for the time of operation of the unit is made by means of the time dial . However, further adjustment is obtained by moving the permanent magnet al ong its supporting she l f; moving the magnet toward the disk and shaft decreases the time, whi l e moving it away increases the time .
Pickup Test
Set the re lay at 0 . 5 time-dia l position and the l owest tap. Using the test connections in Figure 1 5 the main unit shou ld c l ose the contacts within +3 percent of tap �a l ue current .
T · Test
Set the re lay at No . 5 time-dia l setting and the lowest tap. Using the test connection in Figure 14 app ly five times tctp current to the re lay . The re lay operating times to c l ose its contact are l isted in Table 1 1 .
1 0
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GEK-45376
TABLE 1 1
Rel ay Hz Time ( s �cond<;) Min. Max.
IFC66 50 and 60 1 8 . 0 1 9. 2
H I - SE I SM IC INSTANTANEOUS UN I T
Make sure that the instantaneous unit l ink is in the correct position for the range in which it is to operate. See the interna l cOnnections diagram Figure 4 and connect as indicated in the test circuit of Figure 1 6. Whenever possibl e use the higher range since the higher range has higher continuous rating.
� Setting The Hi- Seismic Instantaneous Unit
(
C)
The instantaneous unit has an adjustab l e core l ocated at the top of the unit as shown in Figure 1 . To set the instantaneous unit to a desired pickup l oosen the l ocknut and adjust the core. Turning the core cl ockwise decreases the pickup, turning the core countercl ockwise increases the pickup. Bring up the current s l ow l y until the unit picks up. It may be necessary to repeat this operation, until the desired pickup val ue is obtained. Once the desired pickup va l ue is reached, tighten the l ocknut.
CAUT I ON:
REFER TO TABLE 5 FOR THE CONT I NUOUS AND ONE SECOND RAT I NGS OF THE I NSTANTANEOUS UN I T. DO NOT EXCEED T HESE RAT I NGS WHEN APPL Y ING CURRENT TO THE I NSTANTANEOUS UN IT.
The range of the instantaneous unit (see Tab l e 5) must be obtained between a core position of l /8 of a turn of fu l l c l ockwise and 20 turns counterc lockwise from the fu l l c lockwise position. Do not l eave the core in the fu l l c l ockwise position.
1-! IGH D ROPOUT I NSTANTANEOUS UN IT
Make sure that the movabl e l ead (see Figure 2) is in the correct position for the range in which it is to operate. Whenever possibl e use the higher range since the higher range has higher continuous rating. SeL the interna l connections diagram Figure 5 and connect as indicated in the test circuit of Figure 1 6.
Setting The High Dropout Instantaneous Unit
The high dropout instantaneous unit has an adjustab l e core l ocated at the top of the unit as shown in Figure 2 . To set the instantaneous unit to a desired pickup l oosen the l ocknut and adjust the core. Turning the core c l ockwise decreases the pickup, turning the core countercl ockwise increas�s the pickup. Bring up the current s l ow l y until the unit picks up. It may be necessary to repeat this operation, until the desired pickup va l ue is obtained . Once the desired pickup va l ue is reached, tighten the l ocknut. With the unit picked up, s l ow l y reduce the current until the unit drops out. Dropout current must be 80 percent or greater than the pickup va l ue .
CAUT I ON:
REFER TO TABLE 6 FOR THE CONT I NUOUS AND ONE SECOND RAT I NGS OF THE I NSTANTANEOUS UN IT. DO NOT EXCEED THE SE RAT I NGS WHE N APPL Y I NG CURRENT TO THE I NSTANTANEOUS UN IT.
The range of the instantaneous unit (See Tab l e 6 ) must be obtained between a core position of l /8 of a turn of ful l cl ockwise and 20 turns countercl ockwise from the ful l c l ockwise position.
HI- SE I SM IC TARGET AND SEAL - I N UN I T
The target and seal -in unit has an operating coil tapped at 0. 2 and 2. 0 amperes. The rel ay is shipped from the factory with the tap screw in the higher ampere position. The tap screw is the screw hol ding the right hand stationary contact. To change the tap setting, first remove one screw from the l eft hand stationary contact and pl ace it in the desired tap. Next remove the screw from the undesired tap and � l ace it on the l eft hand stationary contact where the first screw was removed. See Figure l . This proce
Jre is necessary to prevent the right hand stationary contact from getting out of adjustment. Screws shou l d never be l eft in both taps at the same time.
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GEK-45376
Pickup An':! DroE_g�_ Test
l . Connect re l ay studs l and 2 ( See the test circuit of Figure 18) to a d-e source, ammeter and l oad box so that the current can be contro l l ed over a range of 0. 1 to 2.0 amperes. •
2 . Turn the time dia l to the ZERO T IME D IAL position.
3 . Increase the current s l ow ly until the seal -in unit picks up . See Tab l e 12.
4. Move the time dial away from the ZERO T IME D IAL position, the sea l -in unit shou l d remain in the picked up position.
5 . Decrease the current s low l y unti l the seal -in unit drops out. See Tab le 12.
TABL E 12
TAP P ICKUP DROP-OUT CURRENT CURRENT
0 . 2 0 . 12 - 0. 20 0 . 05 or more
2 . 0 1 . 2 - 2 . 0 0 . 50 or more
I NSTALLAT ION
The re l ay shoul d be insta l led in a cl ean, dry l ocation, free from dust, and wel l l ighted to facil itate inspection and testing.
The rel ay shoul d be mounted on a vertica l surface. The out l ine and panel dril l ings are shown in Figures 20 and 21 . Figure 20 shows the semi-fl ush mounting and Figure 21 shows various methods of surface mounting.
The interna l connection diagrams for the re l ays are shown in Figures 3, 4 and 5 . Typical external f connections are shown in Figures 8 and 1 0 .
I NSTALLAT I ON TESTS
The fol l owing tests are to be performed at the time of instal l ation:
Time Overcurrcr.t Unit
Set the tap b lock to the desired tap setting and the time dial to the 0. 5 position. Using the test circuit in Figure 15 gradua l l y appl y current until the contacts just cl ose. This va l ue of current is defined as pickup and shoul d be within three percent of tap value.
Check the operating time at some mul tip l e of tap va l ue and the desired time dia l setting. This mul tipl e of tap va l ue may be five times tap rating or the maximum faul t current for which the rel ay must coordinate. This val ue used is left to the discretion of the user.
Hi- Seismic Target and Sea l -in Unit
l. Make sure that the tap screw is in the desired tap.
2. Perform pickup and dropout tests as out l ined in the ACCEPTANCE TEST section.
Hi-Seismic Instantaneous Unit
l . Se l ect the desired range by setting the l ink in the proper position. ( See Figure 1 and the Internal Connections Diagram ). Whenever possibl e al ways se l ect the higher range since it has higher continuous rating.
2 . Set the instantaneous unit to picK up at the desired current l eve l . See SETT I N G TH E I NSTANTANEOUS UNIT in the ACCEPTANCE TEST section. f
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Gt:K-45376
A l l the tests described above under IN STALLAT ION TESTS must be performed at the time of instal l ation . In addition, if those tests described under the ACCE PTANCE TEST S section were not performed prior to insta l l ation, it is recommended they be performed at this time.
High Dropout Instantaneous Unit
1 . Sel ect the desired range by setting the movab le l ead in the proper position . ( See Figure 2 and the interna l connections diagram ) . Whenever possib l e a l ways se lect the higher range since it has higher continuous rating .
2. Set the hioh dropout instantaneous unit to pick up at the desired current l eve l . See SETT I NG THE HIGH DROPOUT I N STANTANEOUS UN IT in the ACCEPTANCE TEST section.
A l l the tests described above under I N STALLAT ION TESTS must be performed at the time of insta l l ation . In addition, if those tests described under the ACCEPTANCE TESTS section were not performed prior to
t instal lation, it is recommended they be performed at this time.
t
*
PER I OD IC C HECKS AND ROUT I NE MA I NTENANCE
In view of the vital rol e of protective rel ays in the operation of a power system it is important that a periodic test program be fol l owed . It is recognized that the interval between periodic checks wi l l vary depending upon environment, type of rel ay and the user's experience with periodic testing. Until the user has accumul ated enough experience to sel ect the test interval best suited to his individua l requirements it is suggested that the points l isted bel ow be checked at an interval of from one to two years.
These tests are intended to insure that the re l ays have not deviated from their original settings. If deviations are encountered the re l ay must be retested and serviced as describe9 in this manual .
T IME OVERCURRENT UNil.
l . Perform pickup test as described in the I NSTALLAT ION section for the tap setting i n service .
2 . Perform the time tests as described in the I NSTALLAT I ON section.
H I -SE I SM I C I NSTANTANEOUS U N I T
l . Check that the instantaneous unit picks up a t the desired current l eve l , as out l ined in the ACCEPTANCE TEST section.
H I GH DROP OUT I NSTANTANEOUS UN IT
1 . Check that the high drop-out instantaneous unit picks up and drops out at the desired current leve ls, as out l ined in the ACCEPTANCE TEST section.
H I -SE I SM IC TARGET AND SEAL- I N UN IT
l . Check that the unit picks up at the va lues shown in Tab l e 1 1.
2 . Check that the unit drops out at 25 percent or more of tap va lue .
CONTACT CLEAN ING
For cl eaning re l ay contacts, a f lexib l e burnishing.too� shoul d be used . . This.consists of� f �exibl e strip of meta l with an etched-roughened surface resembl 1ng 1n effect a superf1ne f1l e. The po l 1sh1ng
. action is so de l icate that no scratches are l eft, yet it wi l l c l ean off any corrosion thorough ly and rap1dl y . Its f l exibi l ity insures the c leaning of the actua l points of contact. Do not use knives, fil es, abrasive paper or cl oth of any kind to cl ean rel ay contacts. COVER C LEAN I NG
The lexan** cover shoul d 'on l y be c leaned with soap and water . If so l vents are used that contain hydrocarbons, then the cover may become c l oudy.
SYSTEM TEST
A l though this instruction book is primari l y written to check and set the I FC rel ay, overa l l functional tests to check the system operation are recommended at interval s based on the customer's exper ience .
* indicates revison 13 **registered trademark of Genera l E l ectric Company www .
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GEK-45376
SERVICING TIME OVERCURR ENT UN IT
If it is found during instal l ation or periodic testing that the time overcurrent unit is out of l imits, the unit may be recal ibrated as fol lows:
Pickup Tests
Rotate time dial to No. 0 time-dial setting and check by means of a l amp that the contacts just cl ose.
The point at which the contacts _Jst cl ose can be adjusted by running the stationary contact brush in or out by means of its adjusting screw. This screw shoul d be hel d securel y in its support.
With the contacts just cl osing at No. 0 time setting, there shoul d be sufficient gap between the stationary contact brush and its meta l backing strip to insure approximatel y 1 /32 inch wipe.
The pickup of the unit for any current tap setting is adjusted by means of a spring-adjusting ring. By turning the ring the operating current of the unit may be brought into agreement with the tap setting empl oyed if for some reason, this adjustment has been disturbed. This adjustment a l so permits any desired setting intermediate between the various tap settings to be obtained. If such adjustment is required, it is recommended that the higher tap setting be used. It shoul d be noted that the rel ay wil l not necessaril y agree with the time current characteristics of Figures 6 and 7, if the re l ay has been adjusted to pickup at a va l ue other than tap va l ue, because the torque l eve l of the rel ay has been changed.
Connect the operating coil terminal s to a source of the proper frequency and good waveform having a vo l tage of 1 1 0 or more, with resistance l oad boxes for setting the current. See TEST C I RCU IT Figure 1 5 .
With the tap bl ock set for the l owest tap and the time dial set where contacts are just open, adjust the control spring to just c lose the contacts within the l imits given bel ow which are p l us and minus 1 percent of the tao amps. See Tab l e 1 3 .
TABL E 1 3
Tap Range Tap Min. Amps Max. Amps.
0 . 5- 4 0. 5 o. 495 0. 505
l . 0 - 1 2. 0 1 . 0 0. 99 1 . 0 1
It shoul d never be necessary to wind up the control spring adjuster more than 3 0 degrees (one notch ) or unwind it more than 1 20 degrees (three notches ) from the factory setting to obtain the above pickup setting.
Time Tests
With the tap b l ock set for the l owest tap and the time dial at No. 5 setting, appl y five times tap current to the rel ay.
Adjust the position of the drag magnet assembl y to obtain an operating time as l isted in Tab l e 1 4.
TABLE 14
Rel ay Time (Seconds ) Min. Max.
I FC66 1 8. 2 1 9. 0
However, it woul d be preferabl e to adjust the operating time as near as possibl e to 1 8. 6 seconds. The drag magnet assemb l y shou l d be approximate l y in the m idd l e of its travel . The drag magnet assemb l y is adjusted by l oosening the two screws securing it to the support structure. See Figure l . Moving the drag rr· 'et towards the disk and shaft decreases the operating time and moving the drag magnet away from the l and shaft increases the operating time. The screws securing the drag magnet assemb l y to the support structure must be tight before proceeding with other time checks.
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GEK-45376
Mechanical Adjustment
The disk does not have to be in the exact center of either air gap for the relay to perform correctly . Should the disk not clear all gaps, the following adjustment can be made.
l . Determine which way the disk must be aligned to clear all gap surfaces by 0 . 0 10 inch .
2 . Remove the drag magnet assembly by loosening the two screws securing it to the support structure . The screws need not be removed .
3 . Loosen the upper pivot bearing set screw (l/ 16 inch hex wrench) slightly, s o the upper pivot can move freely . Do not remove the set screw from the support structure.
4 . Loosen the jewel bearing set screw as in 3 above.
5 . Apply a slight downward finger pressure on the upper pivot and turn the jewel bearing screw, from the underside of the support structure, to position the disk as determined in 1 above.
6 . Turn the jewel bearing screw 1/8 turn clockwise and tighten the upper pivot set screw to 2 .5-3.5 inch pounds of torque.
7. Turn the jewel bearing screw 1/8 turn counterclockwise . This will lower the disk and shaft assembly approximately 0 . 005 inch and permit proper end-play. The shaft must have 0 . 005 -0.0 10 inch of end-play .
8 . Tighten the jewel bearing set screw to 2 .5 - 3.5 inch pounds of torque.
9. Rotate the disk through the electromagnet gap. The disk should clear the gap surfaces by 0 . 010 inch and be within 0 . 005 inch flatness . If the disk is not within 0.005 inch flatness the disk should be replaced.
10 . Reinstall the drag magnet assembly and check that the disk has at least 0 . 0 10 inch clearance from the drag magnet assembly surfaces .
1 1. Tighten the drag magnet assembly mounting screws with 7 - 10 inch pounds of torque, after securely seating thL: assembly and positioning it according to the TIME TEST above.
HI- SEISMIC INSTANTANEOUS UNIT AND HIGH DROP OUT INSTANTANEOUS UN IT
1 . Both contacts should close at the same time .
2. The backing strip should be so formed that the forked and (front) bears against the molded strip under the armature .
3 . With the armature against the pole piece, the eros::. member of the "T" spring should be in ahorizontal plane and there should be at least 1/64" inch wipe on the contacts . Check this by inserting a 0 . 0 10 inch feeler gage between front half of the shaded pole with the armature held closed. Contacts should close with feeler gage in place .
4. Since mechanical adjustments may affect the Seismic Fragility Level, it is advised that no m�chanical adjustments be made if seismic capability is of concern .
HI- SEISMIC TARGET AND SEAL-IN UNIT
Check l and 2 as described under INSTANTANEOUS UNIT .
To check the wipe of the seal-in unit, insert a 0.0 10 inch feeler gage between the plastic residual of armature and the pole piece with the armature held closed . Contacts should close with feeler gage in place . Since mechanical adjustments may affect the Seismic Fragility Level, it is advised that no mechanical adjustments be made if seismic capability is of concern.
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GE�-45376
RENEWAL PARTS
It is recommended that sufficient quantities of renewal parts be carried in stock to enab le the prompt .p l acement of any that are worn, broken or damaged .
When ordering renewa l parts, address the nearest Sales Office of the Genera l E l ectric Company, specify quantity required, name of the part wanted, and the comp l ete mode l number of the relay for which the part is required .
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t
t
F igure
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3 4 5
6
7 8
9
1 0
1 1
1 2
1 3
1 4
15
1 6
1 7
1 8
1 9
20
2 1
GEK-45 376
L I ST OF F IGURES
TY PE I FC66K RELAY, R EMOVED FROM CASE, FRONT V IEW
TYPE I FC66K RELAY, REMOVED FROM CASE, R EAR V I EW .
INTERNAL CONNECT IONS FOR RELAY TYPE I FC66A - FRONT V IEW
I NTERNAL CONNECT IONS FOR RELAY TYPE I FC66B - FRONT V IEW
I NTERNAL CONNECT IONS FOR RELAY TYPE I FC66K - FRONT V IEW
60 HERTZ T IME-CURRENT :HARACTER I ST I C S FOR RELAY TY PE I FC66.
50 HERTZ T IME-CURR ENT C HARACTER IST ICS FOR RELAY TYPE TFC 66.
TYP ICAL EXTERNAL CONNECT IONS FOR RELAY TYPES I FC 66A AND I FC66B.
MOTOR PROTECT ION CHARACTER I ST I C CURVE . . .
TYP I CAL EXTERNAL CONNECT I ONS FOR RELAY TYPE I FC66K . .
OVERTRAVEL CURVES FOR RELAY TYPE I FC66 . . . . . . . .
TRANS IENT OVERREACH C HARACTER I ST ICS OF THE H I -SE I SM I C I NSTANTANEOUS U N I T . . . . . . . . . . . . . . . . . .
T IME-CURRENT CHARACTER I ST I C S OF THE H I -SE I SM I C I NSTANEOUS UNIT.
TEST CONNECT IONS FOR TEST I NG CT SECONDARY U SED WITH THE I FC RELAY
TEST CONNECT I ONS FOR TEST I NG P I C KUP AND OPERAT I NG T I MES OF THE I FC RELAY T I ME OVERCURRENT U N IT . . . . . . . . . . . . . . . . . . . .
TEST CONNECT I ONS FOR TESTI NG P I C KU P AND O PERAT ING T I MES OF THE IFC R ELAY H I - SE I SM I C I NSTANTANEOUS U N I T . . . . . . . . . . . . . . . .
TEST CONNECT IONS P I C KU P AND D RO POUT OF THE H IGH D ROPOUT I NSTANTANEOU S UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TEST CONNECT I ONS FOR TEST I NG THE H I -SE I SM I C TARGET AND SEAL - I N U N I T �SED W I T H THE I FC RELAY . . . . . . . . . . . . . . . .
CROSS SECT ION OF I FC D RAWOUT CASE SHOWING S HORT I NG BAR .
OUTL I NE AND PANEL D R ILL ING FOR RELAY TYPE I FC66
OUTL I NE AND PANEL DR ILL ING FOR RELAY TYPE I FC66 . . . .
1 7
1 8
1 9
20
2 1
2 2
2 3
24
25
26
27
28
29
30
3 1
32
3 3
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. MAIN STATIONARY -BRUSH AND CONTACT ASSEMBLY
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