Related Manuals for GE IAC66K
Summary of Contents for GE IAC66K
- Page 1 INSTRUCTIONS GEI-44233 F Supersedes GEI-44233 E TIME-OVERCURRENT RELAYS TY:PE IAC66K GENERAL ELECTRIC...
-
Page 2: Table Of Contents
GEI-44233 CONTENTS PAGE DESCRIPTION • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • APPLICATION............RATINGS .... -
Page 3: Description
TYPE IAC66K DESCR IPTION The type IAC66K relay is similar to the IAC51B except: (1) the U-magnet construction has been altered to give a very l ong time operating characteristic, Fig. 1; (2) the tap ranges are shown in Table I, and (3 ) the relay has two instantaneous units, one standard unit, and one special high dropout unit. -
Page 4: Ratings
The high dropout instantaneous unit ranges available are 2-6, 4-12, 10-30 and 20-60 amperes. CHARACTERISTICS The time-current characteris tics for the Type IAC66K relay induction unit are shown in Fig. 1. Fig. 2 shows the time-current characteristics of the s tandard instant��eous unit. -
Page 5: Construction
GEI-44233 Burden data for the standard instantaneous unit coils are given in Tabl e IV. TABLE IV p .F. COIL-AMPS FREQ. VOLT-AMPS WATTS SEC. RATING 0.95 145 AMP 0.95 0.79 0.95 10 - 40 0.95 0.80 0.76 0.21 0.20 0.95 20 - 80 0.20 0.19... -
Page 6: Acceptance Tests
GEK-44233 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. -
Page 7: Time-Overcurrent Unit
GEI-44233 TIME-OVERCURRENT UNIT With the tap plug in the minimum position and the time dial set in the No. 1/2 position, check the It should be within +5 percent of the minimum pickup shown on current required to just close the contact. the tap block. -
Page 8: Inspection
GEI-44233 INSPECTION At the time of installation, the relay should be inspected for tarnished contacts, loose screws, or other imperfections. If any trouble is found, it should be corrected in the manner described under MAINTENANCE. CAUTION: EVERY CIRCUIT IN THE DRAWOUT CASE HAS AN AUXILIARY BRUSH. IT IS ESPECIALLY IMPORTANT ON CURRENT CIRCUITS AND OTHER CIRCUITS WITH SHORTING BARS THAT THE AUXILIARY BRUSH BE BENT HIGH ENOUGH TO ENGAGE THE CONNECTING PLUG OR TEST PLUG BEFORE THE MAIN BRUSHES DO. -
Page 9: Pickup Tests
GEI-44233 Pickup Tests The current at which the contacts operate is determined by the position of the tap plug in the tap block at the top of the relay. Screw the tap plug firmly into the tap marked for the desired current (below which the unit is not to operate). -
Page 10: Renewal Parts
GEI-44233 The tap screw is the screw holding the right-hand stationary contact of the seal-in unit. To change first the tap setting, remove the connecting plug. Then, take a screw from the left-hand stationary contact and place it the desired tap. Next, remove the screw from the other tap, and place it in the left-hand contact. - Page 11 • • ·- -• .0 I • •• •• .0 I I 7 I 110 •• 50 10 70 10 luj" '0.5 .II .1.1.11 ,. I MULTIPLES RELAY TAP SETTING FIG. 1 (088880273-0) Time-cur rent Characteristics of Type IAC66K Relay...
- Page 12 GEI-44233 -+-- ------- �-·--+ ·- - · - · -- � - + - - -· -;- - - ---+- - .. -+ .025 +--- - � - ;- - -r-- - +----t � - +-- • _. .. -+--- -- --+- - - --:--··- t- -".
- Page 13 GEI-44233 INSTANTANEOUS INDUCTION STANDARD HI-DROPOUT • SHORT FINGER FIG. 3 (402A903-l) Internal Connections Diagram for Type IAC66K Relay (Front View).
- Page 14 RELAY AUXILIARY RELAY NORMAL DROPOUT INSTANTANEOUS OVERCURRENT UNIT T BREAKER HIGH DROPOUT INSTANTANEOUS OVERCURRENT UNIT IS CLOSED 52/a AUXILIARY CONTACT CLOSED WHEN CIRCUI T BREAKER COIL TRIP FIG. 4 (104A8568-3) Typical External Connections for Motor Pr.otection Using Type IAC66K Relays...
- Page 15 GEI-44233 ADJUS TAB lE CO RE (A) -- --!:-.: :: :._:. . LOCKNUT(B) ---- -,.-� SLEEVE (C) SHADING RING( D ) FIG. 5 (8036365) Construction of the High Dropout Instantaneous Unit CONNECTING PLUG MAIN BRUSH CONNECTING BLOCK AUXILIARY TERMINAL BLOCK SHORTING �JOTE: AFTER ENGA G ING AUXI LIARY B R...