INSTRUCTIONS

TIME OVERCURRENT RELAYS

TYPES

IFC95AD AND IFC95BD

GEK-49950A Su persedes GEK -49950

GENERAL f) ELECTRIC

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GEK-49950

CONTENTS

PAGE

DESCR I PT I ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 A PP L I CAT ION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 CON ST RUCT ION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 RAT INGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

T I ME -OVE RCU RRENT UN IT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 H IGH -SE ISMIC INSTANTANEOUS UN IT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 H IGH -SE ISM IC TA RGET AND SEA L -IN UN IT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 CONTA CTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

BU RDEN S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 CHARACTE R IST ICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

T I ME -OVERCU RRENT UN IT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Pi ck up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Operati ng-Time Accura cy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

H IGH -SE ISMI C IN STANTANEOUS UN IT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 H IGH-SE ISMI C TARGET AND SEAL- IN UN IT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

RECE IV ING, HAND L ING, AND STORAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 ACCE PTANCE TEST S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 0

V ISUA L INSPECT I ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 0 MECHAN I CA L IN SPE CT I ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 0 D RAWOUT RE LAY TEST ING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 0 P OWER REQU I RE MENTS, GENE RA L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 T I ME -OVE RCU RRENT UN IT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1

Time Setti ng . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 Pi ck up Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 Time Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2

H IGH- SE ISMI C IN STANTANE OU S UN IT . . . . . . . . . . . . . . . . . . . . . . . . . :. . . . . . . . 1 2 Setti ng the High-Seismi c I nsta nta neous U nit . . . . . . . . . . . . . . . . . . . . . . . . 1 2

H IGH-SE I SM I C TARGET AND SEA L -IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 Pi ck up a nd Drop out Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3

IN ST A L LAT I ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3 INSTA L LAT I ON TEST S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3

Time-Overcurre nt U nit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3 Hi gh -Seismi c Target a nd Seal- I n U nit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4 Hi gh- Seismi c I nsta nta neous U nit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4

PE R IOD I C CHECK S AND ROUT INE MA INTENAN CE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4 T I ME OVE RCU RRENT UN IT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4 H IGH- SE I SM I C IN STANTANEOU S UN IT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4 H IGH -SE ISMIC TA RGET AND SEA L -IN UN IT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4 CONTA CT CLEAN ING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 5 COVE R CLEAN ING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 5 SYSTE M TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 5

SE RV ICING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 5 T I ME -OVE RCU RRENT UN IT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 5

Pi ck up Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 5 Time Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 6 Mecha ni cal Adjustme nts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 7

H IGH -SE ISMIC INSTANTANEOU S UN IT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 7 H IGH-SE ISMIC TA RGET AND SEA L- IN UN IT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 8

RENEWA L PA RTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 L I ST OF F IGU RES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 9

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GEK-49950

TIME OVERCURRENT RELAYS

TYPES IFC95AD AND •fC95BD

DESCRIPTION

The Type IF C95AD relay is an extended-range, s ing le-phase, t ime overcu rrent rel ay h av ing a short i nverse-ti me characteristic. The IFC95 B D is s imi lar ex cept that it a lso i n cl udes a h i nged-armatu re instantaneous-overcu rrent u n it. Both the ti me-overcu rrent u n it and the instantaneous-overcu rrent u n it are describ ed i n deta il i n the section on CON STRU CTION. B oth relays a re eq u i pped w ith a dua l- rated target and seal- in u n it.

I n addition to the contacts that are norma l ly provided for tri ppi ng, each of the rel ays is provided w ith contacts that may be used for a larm, remote i nd ication, or othe r p u rp oses deemed suitable by t he user. Note that the contacts associated w ith the target a nd sea l - in u n it w ill operate only after the ti me-overcu rrent- u nit contacts close to d raw trip cu rrent, and hence a re not rel iable for use as tri pping contacts. For the exact contact a rran gement used in each of the rel ays, see F ig u res 3 and 4 (i nterna l -con nections for IFC95AD and IFC95 B D, respective ly) and F ig u re 7 (typical externa l con nections for b oth relays).

T he relays are mounted i n a siz e C1 d rawout case of molded construction. T he outl in e and panel d ril l i ng are show n in F ig u res 1 5 and 16.

W hen sem ifl ush mou nted on a su itab l e panel, these rel ays have a h i g h seismic capab i l ity, i n cl ud i ng b oth the target/seal- in u n it and the i nstantaneous overcu rrent u n it w hen it is s u p pl ied. Also, th ese rel ays a re recog n i z ed u nd e r t h e Comp o n e nts P rog r a m of U nderw riters L aboratories, I nc.

APPLICATION

T he T ype IFC95 AD and IF C95 B D relays a re designed for appl ication w he re a fast i nve rse­t ime characteristic i n comb i nation w ith a rel atively low b u rd en is req u i re d. A typ i cal appl ication is ill ustrated b y F ig u re 7, w here the relay is used to provide sensitive gro u nd­fau lt p rotection for eq u i pment "dow nstream" from a g rounded transformer.

CONSTRUCTION

The I FC i nd ucti on-d isk r ela ys cons ist of a molded case, cov er, s u pport str uct ur e assembly, and a con nection pl ug to mak e up the electrical con nection. See cover fig u re and F ig u res 1 , 2 and 14. F ig u re 2 shows the i nd ication u n it mounted to the molded su p po rt struct u re. Th is d isk is activated by a cu rrent operating coil mounted on a laminated U -mag net. T he d isk and shaft assembly carries a moving contact that compl etes the ala rm or trip ci rcu it w hen it touches a stationary contact. The d isk assembly is restrai ned b y a spi ral spring to g ive the proper contact-cl osi ng cu rrent. The d isk's rot ation is retarded by a permanent mag net in a molded housing on the support structu re.

These instructions do not purport to cover all details or variations in equipment nor provide for every possible contingency to be met in connection with installation, operation or maintenance. Should further information be desired or should particular problems arise which are not covered sufficiently for the purchaser's purposes, the matter should be revered to the General Electric Company.

To the extent required the products described herein meet applicable ANSI, IEEE and NEMA standards; but no such assurance is given with respect to local codes and ordinances because they vary greatly.

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The d rawo ut co n nectio n/test system fo r the C1 case, shown i n F ig ure 1 4, h as pro visio ns fo r 1 4 co n nectio n po i nts, and a visib le cu rrent transfo rmer (CT) sho rti ng b a r located u p f ro nt. As the co n nectio n p lug is w ithdraw n, it c lears the sho rter co ntact f i ngers i n the o utput co ntact c i rcu its f i rst. Th us, the tr ip c i rcu it is o pened b efo re any other c i rcu its a re d isco n nected.

N ext, current-c ircu it f i ngers o n the case co n nectio n b lo ck engage the sho rting b a r ( lo cated at the lower f ro nt of the case) to sho rt-ci rcuit the externa l cu rrent-transfo rmer seco nd a ry co n nectio ns. The w i ndow provides visual co nf i rmatio n of CT sho rting. The co n nectio n p l ug then clears the cu rrent-c ircuit co ntact f i ngers o n the case, and f i na l l y those o n the relay su ppo rt structure, to co mpletely de-energ ize the d rawo ut element.

A H ig h-Seismic target and sea l- in u n it is mo unted o n the f ro nt, to the left of the shaft of t he t i me o vercurrent un it (see F ig u re 1). The sea l- in u n it has two e lect rica l ly sep a rate co ntacts, o ne of w h ich is in series w ith its co i l and in para l le l w ith the co ntacts of the ti me­overcurrent u n it such that w hen the induct io n-u n it co ntacts close, the sea l - in u n it p ick s u p a n d sea ls i n. W hen the sea l- i n u n it picks u p, it ra ises a target i nto view that latches u p a n d remains ex posed u nti l released by pressing a reset b utto n located o n the u pp er l eft s ide of t he cover.

The I FC II BD11 model relays co nta in, i n add itio n to the abo ve, a H igh-Seismic instantaneo us u n it (see Fig u re 1 ). The i nstantaneo us u n it is a smal l h i nged-type u n it w it h e lectrica l ly separate co ntacts and is mo u nted o n the f ro nt, to the r ight of the shaft of the t ime­overcu rrent u n it. One of its co ntacts is no rma l ly co n nected in para l le l w ith the co ntacts of t he time-overcu rrent u n it and its co i l is co n nected i n series w ith the ti me-o vercu rrent u n it. W hen t he i nst antaneo us u n it picks up it ra ises a target that l atches u p a n d rema i ns exposed u nt i l it is released. The same reset b utto n that releases the target sea l - in u n it a l so releases t h e target of the i nstanta neo us un it.

A magnetic shie ld is mo u nted to the su ppo rt structure of inverse and very inverse t ime­overcu rrent I FC relays, to e l im i nate the prox i mity effect of externa l mag netic mate ria l s.

Both the H ig h- Seismic target and sea l- i n u n it and the H ig h-Se ism ic i nstantaneo us u n it h av e t he letters II H i-G II mo lded i nto their target b lo cks to d isti ngu ish them as H ig h-Seismic u n its. Seismic Frag i l ity Level ex ceeds peak ax ia l acceleratio n of 10 g's (4g ZPA) when tested usi ng a b iax ia l m u ltif req uency i np ut motio n to prod uce a Req u i red Respo nse Spectru m ( RRS) i n acco rdance w ith the IEEE G u ide fo r Seismic Test ing of Relays, STD50 1- 1 978.

RATINGS

The relays a re designed fo r o peratio n i n an amb i ent a i r temperatu re f ro m -20°( to + 55°(

TI ME -OVE RCURRENT UN IT

Ra ng es fo r t h e t i me-o vercu rrent un it a re show n in Tab le I.

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Relay

I FC95A D & B D

GEK-49950

TABLE I

Freq uency (Hertz)

50 and 60

Cu rrent Ranges (A mperes)

0. 5- 4.0 1.0- 1 2.0

Avai lab le taps for the ti me-overcu rrent u nit are show n in Table I I.

Range (A mperes)

0. 5- 4.0

TABLE I I

Taps Avai l able (A mperes)

0.5, 0. 6, 0.7, 0.8, 1.0, 1. 2, 1. 5, 2.0, 2. 5, 3.0, 4.0

1 - 1 2 1.0, 1.2, 1.5, 2.0, 2. 5, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 1 0.0, 1 2. 0

The one-seco nd thermal rati ngs are listed i n Tab le I l l.

Model

I FC95

Ti me-Overcu rrent U nit (A mperes)

0. 5- 4.0

1.0- 1 2.0

TABLE I l l

One-Second Rati ng , A ny Tap (A mperes)

82

1 64

K

6724

1 6896

Rati ngs less than one second may be ca lculated accordi ng to the f ormu la I = v'Klf, w here T is the ti me i n seconds that the cu rrent flows.

The conti n uous rati ngs for the ti me-overcu rrent unit are show n i n Tables IV and V.

TABLE IV

0.5 - 4.0 A M PE RE RANGE RAT INGS

Model I FC95

Tap 0. 5 0.6 0.7 0.8 1. 0 1. 2 1. 5 2.0 2. 5 3.0 4. 0

Conti n uous Current 1. 2 1.4 1.5 1.6 1.9 2. 1 2.4 2.9 3.3 3.7 4. 5

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GEK-49950

TABLE V

1.0 - 1 2.0 A M PE RE RANGE SETI INGS

M od el I FC95

Tap 1.0 1.2 1.5 2.0 2. 5 3.0 4.0 5.0 6.0 7.0 8.0 1 0.0 1 2.0

Cont i nu ous Current 2.0 2.3 2.7 3.3 3.9 4. 5 5.5 6.6 7. 5 8.4 9.3 1 0.9 1 2. 5

HIGH-SE I S M I C IN STANTANEOU S UN IT

The i nsta nta neous coil is tapp ed for operat ion on eit h er one of two ra nges (H or L ). Sel ect ion of the h i gh or l ow ra nge is det er m i ned b y t h e pos it ion of the l i nk l ocat ion on t h e t op of the support structure. See Figure 1 a nd Tabl e V I.

TABLE V I

Hi gh-Seis mic Li nk Co nti nuo us O ne K I nsta nta neo us Positio n Ra nge Rati ng Seco nd U n it (Amperes) (Amp eres)t (Amp eres) Rati ng

{AmQ eres)tt L 2 - 10 3.7

2 - so 130 16 ,900 H 10 - so 7.S

L 6 - 30 10.2 6 -1SO 260 67 ,600

H 30 -1SO 19.6

tTh e ra nge is approx i mate, w hi ch m ea ns t hat t h e 2 -10 , 10 -SO may b e 2 - 8 , 8 -SO. T her e wi ll always b e at l east one a mp er e overlap b etween t he max i m u m L s ett ing a nd t he m i n i mu m H s ett i n g. Wh enever p oss ible, b e sure to s el ect t h e h i gher ra nge, s i nce it has t h e h i g h er cont i nu ous rat i n g.

ttH igh er currents may b e appl ied for s horter lengt hs of t i me i n a ccorda n ce w ith th e for mula:

I = VKiT S ince the i nsta nta neous u n it coil is i n s er i es w it h the t i me-over current u n it coil, s ee Tables Ill, IV, V a nd V I to det er mine t he current-l imit ing element for b ot h cont i nuous a n d sh ort­t i me rat i n gs.

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GEK-49950

H IGH- SE ISM IC TARGET AND SEAL- IN UN IT

Rati ngs for the target and sea l- in u n it are show n in Tabl e V I I.

TABLE V I I

Tap

RATINGS PARAMETER 0.2 2

DC Resistance, oh ms ( + 10%) 8.0 0.24

Min. Operati ng Current, amperes ( + 0 -60%) 0.3 2.0

Carry Conti nuous Current, amperes 0.3 3

Carry 30 Amperes f or ( seconds) 0.3 4

Carry 10 Amperes f or ( seconds) 0.25 30

60 Hertz I mped ance, oh ms 68.6 0.73

I f the trip p i n g cu rrent ex ceeds 3 0 a m peres, an a ux il ia ry rel ay should b e u sed and con nections a rranged such that the trip ping cu rrent does not p ass th roug h the contacts o r the target and seal- i n coils of the protective rel ay.

CONTACT S

The cu rrent-closing rat ing o f the contacts i s 30 amperes for voltages not exceed ing 25 0 volts. The current-carry ing rat ing is l i m ited b y the rating of the seal- i n u n it.

BURDENS

Bu rdens for the time-overcu rrent u n it a re g iven i n T able V I I I.

N OTE: T he i m pedance valu es g iven i n T able V I I I a re those for the m i n i m u m tap o f each range; the i m pedance for oth er ta ps at p i ck u p cu rrent (ta p rat i n g) va r ies inversely (approx i mately) as the sq uare of the tap rat ing. For ex a m pl e a n I FC95 60 h ertz rel ay w ith 1 - 12 amp range has an i m pedance of 6.27 oh ms on the 1.0 a m p tap. T he i mpedance of the 2.0 amp tap is (1.0/2.0)2 x 6.27 = 1.57 o h ms.

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GEK-49950

TABLE V I I I

Min. Burdens at Minimum Burdens in Ohms Model Hz Range Tap Pickup, Minimum Tap (Z) Times Pickup

Amps (Ohms) R Jx z 3 10 20

O.S - 4.0 O.S 6.30 24.20 2S.OO 21.30 9.96 6.13 60

1.0 - 12.0 1.0 1.49 6.09 6.27 S.44 2.SS 1.09 IFC9S

O.S - 4.0 O.S S.2S 20.17 20.83 17.7S 8.30 S.11 so

1.0 - 12.0 1.0 1.24 S.08 S.23 4.S3 2.13 0.91

The H igh-Seism i c i nstant aneous un it b u rdens a re l isted i n Tab le IX.

TAB LE I X

High-Seismic Hz Link Range Min. Burdens at Minimum Burdens In Instantaneous Position (Amps) Pickup Pickup (Ohms) Ohms (Z) Unit (Amps) (Amps) Times Pickup

R Jx z 3 10 20

L 2-10 2 0.7SO 0.6SO 0.992 0.634 0.480 0.4S7 2-50 60

H 10-50 10 0.070 0.024 0.074 0.072 0.071 0.070

L 6-30 6 0.110 0.078 0.135 0.095 0.081 0.079 6 - 1SO 60

H 30-150 30 0.022 0.005 0.023 0.022 0.022 0.022

L 2-10 2 0.62S O.S42 0.827 O.S28 0.400 0.380 2 - 50 so

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 - 1SO 50

H 30-150 30 0.018 0.004 0.019 0.018 0.018 0.018

CHARACTERISTICS

TI ME-OVE RCU RRENT UN IT

Pick up

Pick up i n these relays is defi ned as the cu rrent req u i red to close the contact from the 0.5 tim e-di a l p osition. Cu rrent settings are made by means of two movab le leads that con nect to th e tap b lock at the top of th e supp ort (see Fig u re 1 ). The tap b lock is mark ed A th rough M or A th rough N.

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GEK-49950

Example:

The two amp (2A) tap for a 1-to-1 2 I FC95 time-overcu rrent rel ay requ i res one m ovable l ead i n p osition C and the other i n p osition L.

Ope rating-T ime Accu racy

The I FC rel ays should op erate at the times show n i n the publ ish ed tim e cu rve w ith i n ± 7% or plus or m i nu s th e t im e-d i al sett ing t imes 0.01 0 second ( ± Sett ing x 0.01 0 sec.), wh ich ever is g reater. F igures 5 and 6 show the various tim e-cu rrent cha ract eristics for the I FC rel ays. The sett ing of the time d ial determines the length of th e time requ i red to .close the contacts for a g iven cu rrent. The h igher the time-dial sett ing the l onger the ope rat ing tim e.

The contacts are just closed when the time d ial is set to z ero (0). The m ax imum tim e sett ing occu rs when the time-d ial i s set to 1 0 and the d i sk h as to travel its m ax imum d istance t o close the contacts.

Reset

The u n it resets at 90% of the m i n imum closi ng cu rrent. Reset times a re p roportionate to the tim e-dial sett ings. The time requ i red to reset to the number 1 0 tim e- d i al p osit ion when the cu rrent i s reduced to zero (0) is app rox imately fou r seconds (4 sec.) for the I FC95 rel ays.

H IGH-SE ISM IC IN ST ANTANEOUS UN IT

The i nstantaneou s u n it h as a 25-to-1 rang e w ith a tapped coil. There a re h i gh and l ow ran ges, selected by means of a l i nk l ocated on the top of the suppo rt stru ctu re (see F igu re 1). The tim e-cu rrent curve for the i nstantaneous u n it is show n i n F igu re 9.

H IGH-SE ISMIC T ARGET AND SEAL- IN UN IT

The target and seal- in u n it h as two tap sel ections, l ocated on the front of the u n it (see F igu re 1).

RECEIVING, HANDLING, AND STORAGE

These relays, when not included as a p a rt of a control panel, w ill b e sh ipped i n cartons designed to p rotect them against damage. Immediatel y upon receipt of a rel ay, exam i ne it for any d am ag e susta i ned i n transit. I f dam age result ing from rough h a ndl i n g is evi dent, file a d am age cla im at once w ith the transp o rtation company a nd p romptl y notify the nearest G eneral Electric Sal es Office.

Reasonable care sh ould b e exercised i n u npack ing the relay to p revent damage to its p a rts or d i stu rb i ng of the adjustments.

I f the relays are not to be i nstalled immed iately, they should b e stored i n the i r ori g i n al cartons i n a place that is free from moistu re, dust and m etall ic ch ips. Fore ign m att e r collected on the outside may find its w ay i nside when the cover i s rem oved and cause trouble in the operation of th e rel ay.

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ACCEPTANCE TESTS

I mmedi atel y u pon recei pt of the relay an IN SPECTION AND A CCE PTAN CE TE ST sh oul d b e made to mak e su re that n o damage has b een susta i ned i n s h i pment and that the rel ay cal ib rat ions have not b een d istu rb ed. I f the ex a m i n atio n o r test i n d i cates t h at readjustment is necessary, refer to the section on SE RV ICING.

These tests may be performed as acceptance tests or as part of the i nstall ation tests, at the d iscretion of the user. Since most operating compan ies use d ifferent p rocedu res fo r acceptance and for i nstallation tests, the follow ing section includes all appl i cable tests that may b e performed on these rel ays.

VISUAL IN SPE CTION

Check the name pl ate to mak e su re that the model nu mb er and rati ng of the relay a g ree with the requ isition.

Remove the relay from its case and check that there are no b roken o r crack ed parts or a n y other signs o f physical damage.

MECH AN ICAL IN SPE CTION

1. The re should b e no noticeable friction w hen the d isk is rotated slowly clock w ise. The disk should retu rn by itself to its rest position.

2. M ake su re the control spring is not deformed, nor its convolutions tangl ed o r touch ing each other.

3. The armatu re and contacts of the seal -i n u n it, as w ell as the a rm atu re a n d contacts o f the instantaneous u n it, should move freel y w hen operated b y hand; the re should b e at l east 1/64-inch w i pe on the seal- i n and the insta nta n e ou s contacts.

4. T h e targets i n the seal- i n u n it and i n the i nstantaneous u n it must come i nto v iew and l atch w hen the a rmatu res are operated b y hand, and should u nl atch w hen the target rel ease button is operated.

5. M ak e su re that the b rush es and sho rti ng b a rs ag ree w ith the i nternal -con n ections d iag ram.

CAUTION: Should there b e a need to tig hten any screws, to p revent stri pp ing , D O N OT OVE R TIGHTEN .

D RAW OUT RE L AY TESTING

I FC rel ays may b e tested w ithout removi ng them from the panel b y usi n g e ither the 1 2 X CA2 8A 1 or 1 2 X CA 11 A 1 test probes. The test prob es mak e con nections to b oth the rel ay a n d the external ci rcu itry, w h ich p rovides max i mu m fl ex ib il ity but requ i res reasonable care s ince a CT shorti ng ju mper is necessary w h en test ing the rel ay. The test p rob es a re d i fferent i n the nu mber of con nections that can b e mad e. The 1 2 X CA2 8A 1 has a full compl ement of 2 8 con nections and the 1 2 XCA 11A 1 has fou r. Refer to i nstru ct ion b ook GEK -49803 for additional information.

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POWE R REQU I RE MENTS, GENE RAL

All devices operated on alternating cu rrent {AC} a re affected b y freq u en cy. A n o n­si nusoidal w aveform can be analyzed as a fundamental freq uency pl us h a rmon ics of that fu ndamental freq uency. AC rel ays { and AC devices in general) are si g n ificantl y affected b y the appl i cation of non-si n uso idal w avefo rms. Therefo re, i n o rd e r t o test A C rel ays pro perl y it is essential to use a test voltage and/or cu rrent w aveform that is s in uso idal. The pu rity of the si ne w ave { i. e., its freedom from harmonics) cannot be ex pressed as a f in ite n u mber for any particul a r relay; how ever, any rel ay usi ng tuned ci rcu its, RL or RC netw o rk s, or satu rati ng el ectromagnets {such as t ime- overcu rrent rel ays) w o ul d b e essentially affected b y non-s in usoidal waveforms. Hence a resistance-l i mited ci rcu it , as show n in Fig u res 1 1- 1 3, is recommended.

TI ME- OVE RCU RRENT UN IT

Rotate the t ime d ial slowly and check, by means of a l a m p, that the contacts j ust close at the zero (O) time-d ial sett ing.

The point at w h ich the contacts j ust cl ose can be adj usted b y run n ing the stationary­contact b rush i n or out by means of its adj usti ng screw.

W ith the contacts j ust closi ng at the zero (0) t ime setting, there should b e suffic ient g a p b etw een the stationary-contact b rush a n d its metal b ack i n g stri p to ensu re approx i matel y 1/ 32- i nch w i pe.

The m i n i m u m cu rrent at w h ich the contacts w ill j ust cl ose is determi ned b y the tap sett i n g i n the tap bl ock at the top of the su pport structu re. See CHARACTERISTICS sect ion.

The p ick u p of the ti me-overcu rrent u n it for any cu rrent-tap sett ing is adj usted b y means of a spri ng- adj usti ng ring (see Fig ure 1). The spring-adj usti ng ri ng either w inds or u n w i nds the spi ral control spring. By turn ing the r ing, the operating cu rrent of the u n it may b e b roug ht i nto ag reement w ith the tap setting employed, i f th is adj ustment has b ee n d istu rb ed. Th is adj ustment also permits a n y desi red sett ing i ntermed iate b etween the var ious tap sett i ngs to b e obta ined. If such adj ustment is req u i red, it is recom mended that the h ig her tap be used. It should be noted th at the rel ay w ill not necessaril y agree w ith the ti me- cu rrent characteristics of Fig ures 5 and 6 if the rel ay has b een adj usted to p i ck up at a val ue other than tap val ue, b ecause the torq ue l evel of the rel ay w ill have changed.

T ime Sett ing

The sett ing of the ti me d ial determines the l ength of time that the u n it req u i res to close the contacts'w hen the cu rrent reaches a predet ermined val ue. The contacts a re j ust closed w hen the t ime d ial is set on zero (0). W hen the time d ial is set on 1 0, the d isk must travel the max i mu m amount to close the contacts and therefore this sett ing g ives the max i m u m t ime sett ing.

The primary adj ustment for the time of operation of the u n it is made b y means of the t ime d ial. H ow ever, fu rther adj ustment is obta ined by moving the permanent magn et along its su pporti ng shelf; movi ng the magnet toward the d isk and shaft d ecreases the t ime, wh ile movi ng it aw ay i ncreases the time.

Pick up Test

Set the rel ay at the 0.5 t ime- d ial position and the l owest tap. W ith the test con nections as i n F ig u re 1 1 , the ma in u n it shoul d cl ose the contacts w ith i n ± 3% of ta p- val ue cu rrent.

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T i me T est

*Set the relay at the nu mber 1 0 time-dia l sett ing and the l owest ta p. Usi ng the test con nection i n Figu re 1 1 a pp ly ten ( 1 0) ti mes tap cu rrent to the re lay. T he relay o perati ng t ime to close its contact is l isted i n Tab le X.

TABLE X

Relay Hz T i me (seconds)

M in imu m Max i mu m

* I FCGS 60 0.5 1 0 0.540

I FC95 5 0 0.5 65 0.640

H IGH -SE ISMIC IN STANTANEOU S UN IT

Mak e sure that the i nstantaneous-u n it l i nk is in the correct position for the range i n w h ich it is to o perate. See the i nternal con nections d iagram (Figu re 4) and con nect as ind icated i n the test c i rcu it of F igu re 12. W henever possib le use the h ig her range, s ince the h i g h e r range has a h i gher conti nu ous rati ng.

Setti ng the H ig h-Seismic I nstantaneous U n it

The i nstantaneous u n it has an adjustab le core located at the top of the u n it as show n i n F igu re 1. T o set the i nstantaneous u n it to a desi red picku p, loosen the l ock nut and adjust t h e co re. Tu rn i n g the core cl ock w ise d ecreases t h e p i cku p; tu rn i n g t h e c o r e cou ntercl ockw ise i ncreases the picku p. B ring u p th e cu rrent slowly u ntil t h e u n it p icks u p. It may b e necessary to repeat th is operation u ntil the desi red picku p va lu e is obta i ned. Once the d esi red picku p value is reached, tighten the l ock nut.

CAUTION: Refer to Table VI for the continuous and one-second ratings of the instantaneous unit. Do not exceed these ratings when applying current to the instantaneous u nit.

T he range of the i nstantaneous u n it (see Tab le V I) must be obtai n ed b etween a core position of 1/ 8 of a tu rn of fu l l clockw ise and 2 0 tu rns cou nterclockw ise from the fu ll clockw ise position. Do not l eave the core i n the full clockw ise position.

H IGH -SE ISMIC TARGET AND SEAL- IN

T h e target and seal- in u n it has an operating coil tapped at 0.2 and 2.0 amperes. T he rel ay is sh i p ped from the factory w ith the tap screw in the h ig her ampere position (see F igu re 1). T he tap screw is the screw hold ing the rig ht-hand stationary contact. To change the ta p sett ing , fi rst remove one screw from the left-hand stationary contact and place it i n the d esi red tap. N ext, remove the screw from the u ndesired ta p and p lace it on the l eft-h a nd stat ionary contact w here the fi rst screw was removed. T h is procedu re is necessary to prevent th e rig ht-hand stationary contact fr om getti ng out of adjustment. Screws sh ould never b e l eft i n b oth taps at the same time.

* Revised si nc e l ast issu e

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Pick up and D ropout Test

1. Con nect relay studs 1 and 2 (see the tes� ci rcuit of F igure 1 3) to a DC sou rce, ammeter, and load box so that the cu rrent can be control l ed over a range of 0. 1 to 2.0 amperes.

2. Turn the time d ia l to the zero (0) time-d ia l position.

3. I ncrease the cu rrent slow ly unti l the sea l- in u n it p icks up. See Tab le X I for p ick u p cu rrent range.

4. Move the ti me d ia l away from the zero (O) position; the sea l- i n u n it sho u l d rema in in the picked- up position.

5. Decrease the cu rrent slow ly unt i l th e sea l- i n u n it drops out. See Tab le X I for dropout cu rrent.

Tap

0.2

2.0

TABLE X I

Pick u p Cu rrent

0. 1 2- 0.20

1.2- 2.0

INSTALLATION

D ropout Cu rrent

0.05 or more

0. 50 or more

The re lay shou ld b e i nsta l led i n a clean, d ry location that is free from dust and w e l l l ig hted to fac i l itate i nspection and testi ng.

The relay shou ld b e mou nted on a vertica l su rface. The outl ine and panel d ri l l i ngs are show n i n F ig ures 1 5 and 1 6. F ig ure 1 5 shows the semi-fl ush mounti ng and F ig u re 1 6 show s various methods of su rface mou nti ng.

The i nternal- connections d iagrams for the relays are show n i n F igures 3 and 4. Typ ica l external con nections are show n in F igure 7.

IN STALLATION TESTS

The fol low ing tests are to b e performed at the t ime of i nsta l lation:

Ti me-Overcu rrent U n it

Set the tap b lock to the desi red tap setti ng and the t ime d ia l to the 0.5 posit ion. U si ng the test ci rcu it i n F igure 1 1 , g radua l ly apply cu rrent unti l the contacts j ust close. Th is va l ue of cu rrent is defined as pick u p and should be w ith in 3% of ta p va l ue.

Check the operati ng t ime at some multi ple of tap va lue and the desi red ti me-d ia l sett ing. This m u lt ip le of ta p va lue may b e ten ( 1 0) ti mes tap rati ng or the max i m u m fau lt cu rrent for w h ich the relay must coord inate. The choice of the particu lar va l u e is left to the d iscretion of the user.

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H ig h-Seismic Targ et and Seal - In U n it

1. Mak e su re that the tap screw is in the desi red tap.

2. Perf orm picku p and d rop- out tests as outl i ned i n the ACCEPTANCE TESTS sect ion.

H ig h-Seismic I nstantaneous U n it

1. Select the desi red range by setting the l i nk in the proper position. { See F igu re 1 and th e i nternal-connections d iagram.) W henever possibl e, select the h i g h e r range si nce i t has a h i g her conti nu ous rat ing.

2. Set the i nstantaneous u n it to pick u p at the desi red cu rrent l evel. See Sett ing The H ig h-Seismic I nstantaneous U n it i n the ACCEPTANCE TESTS section.

All tests describ ed above u nder IN STAL LATION TESTS must b e performed at the t ime of installation. I n addition, if the tests d escrib ed u nd er th e ACCEPTANCE TESTS section w e re not performed pr ior to i nstall ation, it is recommended they be performed at th is t ime.

PERIODIC CHECKS AND ROUTINE MAINTENANCE

I n view of the vital role of protective relays i n the operation of a power system, it is i mportant that a period ic test prog ra m b e foll owed. It is recog n i z ed that the i nterval b etween period ic checks w ill vary depend ing u pon environ ment, type of rel ay, a nd the user's ex perience w ith testing. U ntil the user has accu mul ated enou g h ex perience to select the test i nterval b est su ited to h is ind ividual requ i rements, it is su ggested that the points l isted b el ow be checked at an i nterval of from one to two years.

These tests a re i ntended to ensu re that the relays have not deviated from th e i r o rig i n al setti ngs. I f d eviations a re encou ntered, the relay must b e retested and se rvi ced as descri bed in this manu al.

TI ME-OVE RCU RRENT UN IT

1. Perform the picku p test as describ ed i n the INSTALLATION section for the tap sett ing i n service.

2. Perform the t ime test as describ ed i n the INSTALLATION section.

H IGH -SE I SM I C IN STANTANEOUS UN IT

1. Check that the i nstanta neous u n it picks u p at the desi red cu rrent l evel , as outl i n ed i n the ACCEPTANCE TESTS section.

H IGH-SE I SM I C TARGET AND SEAL -IN UN IT

1. Check that the u n it p icks u p at the values show n in Table X I.

2. Check that the u n it d rops out at 2 5% or more of tap value.

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C ONTACT CLEAN ING

For cleanin g re lay contacts, a flexib le b urnish ing to ol shou ld b e used. This consists of a flexib l e str i p of meta l with an etch-r oughen ed surface resemb ling in effect a su perfin e fi l e. The polishin g acti on is so de li cate that no scr atches ar e left, yet it wi l l c lean off an y corrosi on thorough ly and rapi d ly. Its flexibi lity ensur es the cleaning of the actual points of contact. Do not use knives, fil es, abrasive paper , or cloth of any kind to c lean r e l a y contacts.

*C OVE R CLEAN ING

The Clear L ex an® cover should b e clean ed with a soft c loth and w ater on ly. N o clean ing sol utions should b e used. Use of cleaning sol utions may damage the clear cover.

SYSTE M TEST

Alt h ou g h this instr uction book is pr i mar ily wr itten to check and s et t h e I FC r elay , overall fun ction al tests to ch eck t he system oper ation are r ecommended at interva ls based on the customer's ex per ien ce.

SERVICING

TIM E- OVE RCU RRENT UN IT

If it is found d ur in g installation or per i odic testin g that the ti me-over current un it is out of l im its, the un it may be r ecal ibrated as foll ows:

P i ckup Tests

R otate the t ime d ial t o t he z er o (0) position and check , by means of a la mp, that the conta cts j ust close.

The point at w h ich the contacts j ust close can be adj usted by runn ing t he stat i onary contact br ush in or out by means of its adj usting s cr ew.

W ith t he contacts j ust clos in g at t he zer o (0) t ime-d ial sett ing, ther e should b e suff ic ient g a p b etw een the station ar y cont act bru sh and it s met al ba ck ing str ip t o ensur e a ppr ox i mately 1/3 2-inch w i pe.

The p ick up of the un it for any curr ent-tap setting is adj ust ed by means of a spr ing­adj usting r ing. By turn ing the r in g the oper ating current of the un it may b e bro ught into agr eement w ith the tap settin g employed if, _for some r eason , th is adj ust ment has b een d isturbed. Th is adj ustment also per mits any desired setting inter med i at e b etween t he var ious tap settings to b e obtained. I f such adj ustment is r equ ired, it is r ecommended t h at the h ig her ta p setting be used. It should b e n oted that t he r el ay w ill n ot n ecessar ily a gr ee w ith the t ime curr ent char acter istics of Fi gures 5 and 6 if the r el ar h as b een adjusted t o p ick u p at a val ue other than tap val ue, because the torq ue l eve of the r elay has b een chan ged.

Connect the oper ating-coi l ter m in a ls to a source of the proper fr equency , g ood w avefor m, and an a m pl itud e of 1 1 0 volts or h igher , usin g resistan ce l oad box es for the s etting curr ent (see the test cir cu it in Figur e 1 1 ).

® Registered Tr ademark of G en er a l E lectric Company * Revised since l ast issue

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W ith the tap bl ock set for the lowest ta p and the time d ial set w here contacts a re j ust open, adj ust the control sprin g to j ust close the contacts w ith in the l i m its g iven b el ow. These l i mits a re± 1% of the tap amps. See Tabl e X I I.

TABLE X I I

Tap Ran g e Tap M in i mum Amps Max i m u m Amps

0. 5-4 0. 5 0.495 0. 505

1.0- 1 2.0 1.0 0.99 1.0 1

It shoul d n ever b e n ecessary to w ind up the control sprin g adj uster more than 3 0° (on e n otch) or unw in d it more than 1 20° (th ree notches) f rom the factory settin g to obta in the ab ove pick u p settin g.

Time Tests

*W ith the tap block set for the low est tap and time d ial at the n u mber 1 0 settin g, a p pl y 1 0 t imes tap cu rrent to the rel ay.

Adj ust the position of th e d rag magnet assembly to obta in an operatin g ti me as l isted in Tabl e X I I I.

TABLE X I I I

Time (Seconds) Relay Hz

M in i m u m Max i m u m

50 0.578 0.61 2 I FC 9 5

60 0. 5 1 0 0. 540

Althou g h a ti me b etw een the l isted M in i m u m and Max i m u m w ill b e acceptabl e, it w o uld be p refe rable to adj ust the operating t ime as near as possible to 0. 52 5 secon ds for 60- hertz relays and 0.595 seconds f or 50- hertz rel ays. The d rag magn et assembl y shoul d b e approx imately in the middle of its travel. The d rag magn et assembl y i s adj usted b y l oosen in g the two screws secu rin g it to the support structu re. See Fig u re 1. Movin g the d rag magn et towa rds the disk and shaft decreases the operating ti me, and movin g the d rag magn et away f rom the disk and shaft increases the operatin g t ime. The screws secu ring the d rag magn et assembl y to th e su pport structure must b e t ig ht befor e p roceedin g w ith other time checks.

* Revised sin ce l ast issue

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Mechanica l Adj ustments

The disk does not have to b e in the ex act center of eit her ai r gap for the relay to perform correctly. Shou ld the disk not clear a l l gaps, the fol l owin g adj ustment can be made.

1.

2.

3.

4.

5.

6.

7.

8.

9.

Determine w hich way the disk must be a li gned to clear a l l su rfaces by 0. 0 1 0 inch.

Remove the d rag magn et assemb ly by loosening the tw o screws securing it to the su pport structu re. The screws need not be removed.

Loosen the u pper pivot b earing set screw ( 1/ 1 6-inch hex w ren ch) sli g htly, so the upper pivot can move freely. Do not remove the set screw from the su pport structu re.

Loosen the jewel bearin g set screw as in step 3 ab ove.

Apply a sli g ht downw ard finger pressu re on the upper pivot and turn the j ew e l b ea ring screw, from the underside of the su pport structu re, to positi on the disk as determined in step 1 ab ove.

Turn the jewel b earing screw 1/ 8 tu rn clockwise and tig hten the u pper pivot set screw to 2.5-3.5 inch- pounds of torque.

Tu rn. the j ewel bearin g screw 1/8 turn counterclockwise. This wi l l low e r the disk and shaft assemb ly approxi mately 0.005 in ch and permit proper end p lay. The shaft must have 0.005 to 0. 0 1 0 in ch of end play.

Ti g hten the jewel bearing set screw to 2.5-3.5 in ch- pounds of torq ue.

Rotate the disk through the electromagn et gap. The disk should clea r the g a p su rfaces by 0.0 1 0 inch and b e within 0.005 inch flatn ess. I f the disk is n ot within 0.005-inch flatn ess the disk should be replaced.

1 0. Reinsta l l the drag assemb ly an d check that the disk h as at l east 0. 0 1 0-in ch clearan ce from the drag magnet assemb ly su rfaces.

1 1. Ti g hten the d rag magn et assemb ly mountin g screws with 7- 1 0 in ch- pounds of torq ue, after secu re ly seating the assemb ly and positionin g it accordin g to the ti me test ab ove.

H IG H -SE ISMIC IN STANTANE OUS UN IT

1. B oth contacts shou ld close at th e same ti me.

2. The backing stri p shou ld b e so formed that the fork ed end (front) b ea rs against the molded stri p under the armatu re.

3. With the armature against the pole piece, the cross member of the "T" spring shou ld b e in a hori z ontal p lan e and the�e should b e at least 1/ 64-in ch wi pe on the contacts. C heck this by insertin g a 0. 0 1 0-in ch feeler gage b etw een the front h a lf of the shaded pole with the armatu re held closed. Contacts should close with the fee ler gage in place.

4. Sin ce mechani ca l adj ustments may affect the Seismic Fragi lity Level, it is advised that no mechanical adju stments be made if seismi c capabi lity is of con cern.

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H IGH -SE ISMIC TARGET AN D SEAL- IN UN IT

T he l eft cont act must make b efore t h e r ight cont act does.

T o check t he w i pe of t he seal -in un it , insert a feeler gage b etw een t he r esidual b utt on of t he ar mat ure and t h e fr ont end of t he pol e piece. T he left cont act should cl ose w it h a 0.0 1 5 ± 0.002 feeler gage and t he r i g ht cont act w it h a 0.0 1 0 ± 0.002 feel er gage.

S in ce mechan ical adj ust ments may affect t h e Seismic Fr ag il ity Level , it is advised t h at no mechanical adjustments be made if se ismic capab il ity i s of concern.

RENEWAL PARTS

It i s r ecommen ded t hat sufficient q uant it ies of ren ew al parts b e carr ied in st ock t o en abl e t h e pr ompt r e pl acement of any t h at ar e worn , brok en or damaged.

W hen ord er ing r en ew al parts, address t he n ear est Sal es Office of t he G en er al Electr ic C o mpan y and specify quant ity r eq uir ed, name of t h e part w ant ed, and t he com pl et e mod el n u mb er of t he r el ay for w h ich t h e part is req u ir ed.

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FIGU RE

1

2

3

4

5

6

7

8

GEK-49950

LIST OF FIGURES

Type I FC95B D Relay, Removed from Case, Front V iew ... .. . . . .. . . . . . .

Type I FC95B D Relay, Removed from Case, Rear V iew . . . . . . . ... . . . . . . .

Intern a l C onnections for Relay Type I FC95AD, Front V iew . . .. . . . . . . . . .

Intern a l Conn ections for Relay Type I FC95B D, Front V iew

60-Hertz Ti me-C u rrent C haracteristics for Relay Types

I FC 9 5AD and I FC95B D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

50-H ertz Time-C u rrent C haracteristics for Relay Types

I FC 9 5AD and I FC95B D . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Typica l Extern a l Conn ections for Relay Types I FC95AD and I FC 9 5B D . . . .

Transient Overreach Characteristics of the H igh-Seismic

PAGE

20

2 1

22

2 2

23

24

2 5

Instantaneous Un it . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 6

9 Time-C u rrent C h aracteristics of the H igh-Seismic

Instantan eous Un it . . . . . . . . . . . . . . . . ... . . . . . . . . . . . . . . . . .... . . . . . . . .

1 0 Test C onnections for Testing CT Secondary used w ith the I FC Relay

1 1 Test Connection s for Testing P ick u p and Operating Times

of the T ime-Overcurrent Un it . . . . . . . . . . .. . . . . . . . . . . . . . . ..... . . . . . .

1 2 Test C onnections for Testin g P ick u p and Operatin g Times

27

28

29

of the H ig h -Seismic Instantaneous Un it . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 0

13 Test C onnections for Testing the H igh-Seismic Target

and Seal- In Un it . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1

1 4 C ross Section of I FC Draw-Out C ase, Show in g Shortin g B a r . . . . . . . . . . . . 3 2

* 1 5 Outl in e and Pane l Drill ing for Semi-Fl ush Mountin g ,

Relay Types I FC 9 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

* 1 6 Outl in e and Pan el Dri l l in g for Su rface Mounting,

Relay Types I FC 9 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4

R evised since l ast issue

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TOP PIVOT

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GEK-49950

TIME OVERCU�RENT TAP S ELECTORS

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DR AG MAGNET ASSEMBLY

Fig ur e 1 (8043006)Type I FC95B D Relay, Removed From C ase, Front V iew

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SUPPORT --­STRUCTURE

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U-MAGNET AND TAP BlOCK ASSEMBlY TIME OVERCURRENT UNIT

F igure 2 (80430 1 0) Type I FC95B D Relay Removed From Case, Rear V iew

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Fig ure 1 0 (0269A 1 787- 1 ) Test Connections for Testing C T Secondary us ed w ith the I FC Relay

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GEK-49950

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Figur e 1 1 (0269A 1 789) Test Connections for Testin g Pick u p and Oper atin g Ti mes of the Ti me-Overcurr ent Un it

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GEK-49950

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F igur e 1 2 (0269A 1 788- 1 ) Test C onnections for Testin g Pick u p and Oper atin g T i mes of the H igh-Seismic Instantaneous Un it

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V A R l f.I. B L E R E S I S T O R

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Fi g ur e 1 3 (0269A 1 790) T est Connections for T estin g the H igh-Seis mic T ar g et and Seal -In Unit

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GEK-49950

C O N N E CT ION PL U G CONTACT F I N G ERS DRAWO UT E L EMENT SUPPORT STR U CT U R E

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F igur e 14 (80427 1 5) Cr oss Section of I FC Draw- Out Case, Show in g Shortin g B ar

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* Fig ure 1 5 (02 57 A8452 Sheet 1 3) Outl ine and Pane l Dri l l i ng for Sem i-F lush Mounting Relay Types I FC95

* Revised since last issue

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5/89

Meter and Control Business Department

General Electric Company 205 Great Valley Parkway Malvern, PA 19355

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