GE IFC66A Instructions Manual
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GE IFC66A Instructions Manual

GE IFC66A Instructions Manual

Time overcurrent relays
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  • Page 2 •...

  • Page 3: Table Of Contents

    GEK- 45 3 76 CONTEN TS PAGE DESCR IPT I ON............. .. APP L ICAT I ON .

  • Page 5: Ap Plication

    Figure The IFC66A and IFC 66B re l ays are a l so useful for appl ication on the primary of a smal l l ow vo l tage l oad In such center transformer when the secondary main protective device is an insul ated case circuit breaker.
  • Page 7 GEK-45376 The user must determine the specific setting s which will provide the required protect ion for his �achine, and select a relay model having the operating ranges needed to obtain these settin gs. With settings as illustrate d in Figure 9 and external connections shown in Figure 10, the operation of �""...

  • Page 9: Rat Ings

    Gt:K-45376 Both the Hi- Seismi c target and sea l -in unit and the Hi- Seismi c instantaneou s unit have the letters " Hi ­ G" mo l ded into their target block to distinguish th em as Hi-Seism ic units . Seismic fragility l eve l exceeds peak axia l acceleration of l Og's ( 4g Z PA ) when tested using a biaxia l mu l ti -frequ ency input motion to pro­...
  • Page 11 G!:K-45376 TABLE 5 **One Hi-Seismic Continuo us Link Second Instantaneous Range Rat in Position Rat in Unit (Amps) (Amps) (Amps (Amps 2 - 50 2 - 10 16,900 10 - 50 6 - 150 6 - 30 10.2 67,600 30 - 180 19.6 There will always be at least *The range is approximate, which means that the 2-10, 10-50 may be 2-8, 8-50.

  • Page 13: Contacts

    GEK-45376 TABLE 7 0.24 D. C. Resistance : 10% (ohms) 2. 0 Min. Operating (Amp. ) +0 -60% Carry Continuous (Amperes) 0.03 Carry 30 Amps for (Sec. ) 0.25 Carry 10 Amps for (Sec. ) 68.6 0. 73 60 Hz Impedance (Ohms) 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.

  • Page 15: Character Ist Ics

    GEK-45376 TABLE 9 Link Range Burdens In Min. Burdens at Min. (Amps) Seismic Position Ohms (Z) Pickup Pickup (Ohms) Inst. Unit Times Pickup (Amps) (Amps) 2-10 0.750 0.992 0. 634 0.480 0.650 0. 457 2-50 10-50 0.072 0.070 0.024 0.074 0.071 0.070 6-30...

  • Page 17: Hi -Seismic Instantaneous Unit

    GEK�45376 Reset Tne unit resets at percent of the m1n1mum closing current. Reset times are proporti onate to the The time to reset to the number 1 0 time-dial position when the current is reduced to time-dial settings. 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.

  • Page 19: Power R Equirements-General

    GE K-45376 Make sure that the brushes and short ing bars agree with the interna l c onnections diagram . CAUTION: Shou l d there be a need to tighten any screws , DO NOT OVER TIG HT EN to prevent stripp ing.
  • Page 21 GEK-45376 TABLE 1 1 Re l ay Min. Max. 50 and 60 1 8 . 0 IFC6 6 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 See the interna l cOnnections diagram Figure 4 and connect as indicated in the test circuit of operate.

  • Page 23: Hi-Seismic Instantaneous Unit

    GEK-45376 Pickup An':! DroE_g�_ Test Connect re l ay studs l and 2 See the test circuit of Figure 1 8 ) to a d-e source, ammeter and l oa d • box so that the current can be contro l l ed over a range of 0. 1 to 2.0 amperes. Turn the time dia l to the ZERO T I M E D IAL position.

  • Page 27: T I Me Overcurrent Un I T

    GEK-45376 RVICIN TIME OVERCURR ENT U N I T If it is found during instal l ation or periodic testing that the time overcurre nt unit is out of l imits, the unit may be recal ibrated as fo l l ows: Pickup Tests Rotate time dial to No.

  • Page 29: H I - S E I Sm I C Instantan Eous Un I T

    GEK-45376 Mech anic al Adju stme nt The disk does not have to be in the exact center of either air gap for the relay to perform correc tly . Should the disk not clear all gaps , the following adjustment can be made. Determine which way the disk must be aligned to clear all gap surfac es by 0 .
  • Page 31 GE�-45376 RENEWAL PARTS It is recommended that sufficient quantities of renewal parts be carried in stock to enab l e the pro m pt .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 Co mpany, 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 .
  • Page 33 GEK-4 5 3 76 L I ST OF F IGURES F igure TY P E I FC 6 6 K RELAY, R EMOVED FROM CASE, FRONT V IEW TYPE I FC 6 6 K RELA Y, REMOVED FROM CASE, R EAR V I EW . C ON NECT IONS FOR RELAY TYPE I FC66A - FRONT V IEW INTERNAL I NTERNAL CONNECT I O N S FOR RELAY TYPE I F C66B - FRONT V IEW...
  • Page 43 GEK-45 3 76 IN DUCTlON UNIT TSl- HI QROPOUT E TTlf\G S I,_,.ST SETTlNGS " LINK TO '' H SHOWN HIGH FOR HIGH RANGE L" RANGE. AN D F 0 R CONNECT LOW RANGE. TERMINAL "E" FOR LOW SHCWN LINK RANGE.
  • Page 45 GE K - 4 5 376 f 1 1 ! 1 1 1 1 1 1 ! 1 1 1 N 70 11 111 • • • • • 1 • • • • 1 1 1110 1 ..
  • Page 47 G E K - 4 5 3 7 6 1 I I I 1 I I 1 0 SO 10 1G 108 1000 , .. , .. "' •• � .. •o "' � l.I.J <( � T I M E U N I T 01 z .Ill .
  • Page 49 G F. K- 1! 5 3 76 A - C 8 U S 5 0 · 1 5 1 - 1 • 5 0 -3 5 1 · 5 1 · s o . :: 5 0 · 2 5 0· 1 S A l \ P H A S E ·...
  • Page 51 G E K- 4 5 376 � .:._ T I M E / O V E R - :::J C U R R E . N T U N I T ( � ) Lt <( H I G H N O R M A L / O R O P O U T :::J...
  • Page 53 G E K - 4 5 3 7 6 5 0 · 1 5 0 - 1 5 1 · 1 T O C 5 0 ·2 5 0 ·2 5 1 -3 5 0 ·3 5 0- 3 T O C ti X 50 ·...
  • Page 55 G i: �- 4 5 3 76 I FC 6 6 O V E R T R A V E L i1 1 w 1 3 T O - 2 <D <( � 1 0 0... T 0 4 1 0...
  • Page 57 G E K - 4 5 3 7 6 � i � w % o (I) - - � :::E ll.. ::z:: § � .5 ct � � � > � � � �� � < >- L.J :j • CL..
  • Page 61 G E K - 4 5 3 76 R E L A Y C C I L R E L A Y G O !l I N C I R C U I T N O T I N C I R C U I T R E L A Y T E R M I N A L S R E L A...
  • Page 65 G E K - 4 5 3 7 6 S TA R T I I\� E 1=\ VA R I A B L E M I N I M U M REC 0 f\11 M � N D E D V O L T S ) 1 2 0 AT R A T E D...
  • Page 67 G E K - 4 5 3 7 6 TO S T A RT T I M E R I M U M R E C O M M E N D E D I V A R I A B L E V O L T S 1 1 2 0 A T I R.
  • Page 71 G E K - 4 5 3 7 6 D R A W O U T E L E M E N T C O N N E C T I O N C O N T A C T P L U G F I N G E R S S U PP O R T S T R U C T U R E...
  • Page 73 G E K - 4 7 3 7 6 R E L AY - - - - t--- 7 .3 76 6 . 1 2 4 1 5 6 M� 1 88 � N 3.6 8 8 9 4 M M 8 1 -..j �...
  • Page 75 G E K - 4 5 3 7 6 6.062 - . 5 5 6 2 -·-j 154HM 1 42 M N R E L AY 7 S M M L - - 6. 1 2 4 ��-- 7 1 M M 7.

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