GE 12IAC8OL, Instructions Manual

Page 1: ...r that there be a phase displace ment in flux to rotate the disk When the shading coil circuit is completed torque can be developed on the induction disk and the unit will operate on overcurrent When the shading coil circuit is open the unit will not operate at current levels up to 20 times tap value The time current curves burdens and ratings of this relay are as given in GEH 1788 for model 121AC...

Page 2: ...SHORT FINGERS CONTROL WINDINGS C 6 FIG 1 0226A7211 0 INTERNAL COKNECTIONS DIAGRAM FOR THE IACBOL A RELAY FRONT VIEW GENERAL ELECTRIC CO POWER SYSTEMS MANAGEMENT BUSINESS DEPT MALVERN PA 19355 SEAL IN 1 3 2 4 8 70 ...

Page 3: ...INSTRUCTIONS GEH 1 788L TYPES TIME OVERCURRENT RELAYS GENERAL ELECTRIC IAC53A IAC53B IAC53C IA C5 3 R IAC54A IAC54B ...

Page 4: ...IONARY CONTACT FT S AL N UNIT STATIONARY CO N TA T RIGHT SEAL IN MOVING CON TACT AC 3EMBLY TAP BLOCK TIMF DIAL DISK SHAFT MAIN MOVING CONTACT M A N STA IDNARY ROUGH AND CONTACT ASS C MB L Y MAGNET 0151 ii Si p p 4 Fiq I The Induction Unit for Type IAC Relays Front View DISK AND SHAFT JEWEL SCREW Fin 2 The Induction Unit for Type IAC Relays Rear View 2 ...

Page 5: ...ch that when the main 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 button beneath the lower left corner of the cover APPLICATION The induction unit is the main unit in all Type IAC relays supplying the very inverse time delay characteristics of the relay and soundi...

Page 6: ... S O6 0 7 0 6 0 0 12 2 O 2 5 3 0 4 05 0 6 O 7 O 80 IO 0 I2 I6 I I I 1I 11 J I 17111 I IJI ADJ US TII EN P S INST UNIT CON TI NUOLISLY AUJU S tO P I 7 II N I Ii Figure 3 0888e0270 3 Time Current Curves for Type IAC Relays with Very Inverse Time Characteristics I 4 4 I 7 I III 7 441 44744411 0 5 4 0 1 5 12 0 2 16 NI eu I 44 H ia 4 1 I 13 74fl 5 E 4 I 4 4 1 4 3 2 1 44 44 17 JA U I 44 N W7IWW I S 5 II...

Page 7: ... any of the three coils can be determined for any value of current up to 20 times tap setting from Fig 6 Coil I Volt Imp Amps Freq Tap Amps Amps Ohms PF 4 16 60 4 5 2 0 0 08 0 50 50 4 5 1 7 0 07 0 50 25 4 5 1 3 0 05 0 61 1 5 6 60 1 5 5 14 5 0 58 0 42 50 1 5 5 12 0 0 48 0 42 25 1 5 5 9 0 0 36 0 55 0 5 2 60 0 5 5 105 0 4 20 0 35 50 0 5 5 86 0 3 45 0 34 25 0 5 5 82 0 3 28 0 55 60 0 1 5 3050 122 0 38 ...

Page 8: ...LAYS PIC1 UP CURRENT LOWEST TAPS OF VERY INVERSE Fig 6 Saturation Curves for Lowest Taps of tre Induction Unit of Type IAC Re ays with Very Inverse Time Character i stics 26 24 22 20 16 14 12 10 8 6 4 2 0 V 0 L T A G E z V V Ez iEEEEz 6 0r 5Q 25 6O 50 25 50 s 25 TA P RANGE 0 5 2 0 AMPS TAP RANGE 1 5 6 0 AMPS TAP RANGE 4 16 AMPS V C C 0 a U 6 ...

Page 9: ... 6306872 5 Time Current Characteristics for Original Instantaneous Unit I I94C RATD TMTIRJS IJIT Fig 7B 0208A869 5 1 Time Current Characteristics for the Hi G Unit c LI Cr LI L 0 OPERATING TIME c RANGE FOR ANY PICKUP SETTING 0 0 1 2 3 4 5 6 M JLTIPLES OF PICK UP 7 8 9 aILTIPiF OF PICOOP 7 ...

Page 10: ...I 5 0 20 0 008 0 95 25 5 0 18 0 007 0 98 A C TRIPPING UNIT INTRODUCTION The a c tripping unit is a Type REA relay unit designed to energize a circuit breaker trip coil from its associated current transformer upon the operation of the main unit of the Type TAC relay It transfers the current from the secondary of the current transformer into the trip coil and removes the current from the trip coilwh...

Page 11: ...s used in Conjunction with Tripping Reactors for Protection of a 3 Phase Circuit Device Function Numbers for Use with ALL External Diagrams Instantaneous Unit Overcurrent Relay Type IAC Ground Overcurrent Relay Type IAC Power Circuit Breaker Seal in Unit with Target Trip Coil Auxiliary Contact closed when breaker closes Figure 10 K 6375669 6 External Connections of Three Type IAC53R Relays Used Fo...

Page 12: ...ng is evident file a damage claim at once with the transportation company andpromptly notify the nearest General Electric Apparatus Sales Office Reasonable care should be exercised in unpack ing the relay in order that none of the parts are injured or the adjustments disturbed If the relays are not to be installed immed iately they should be stored in their original car tons in a place that is fre...

Page 13: ...ype IAC53C Relay Front View a a L1 Fig 13 Internal Connections for Type 1AC538 Relay Front View Fig 15 Internal Connections for Type IAC5 Relay Front View A C iRI UN I I NSTANT T U 0 0 C c 4 a U SEAL N UN I I NOUCT ON SEAL IN UNIT IN5TAN UN I I 11 13 5 2 6 1 5 6 ZSHORT FINGER SHORT FINGER SEA Li N UNIT INDUCT I UN I T INDUCTION UN 3 6 1ndicatts Revision 11 ...

Page 14: ...ing opened 1 L0 CD SEAL IN UN I 1 Ti a a r j aD 0 0 C i CD NSTANT IN II SI AL I N a6 SH IQI FINGEA Fig 16 InternalConnections for Type IACSLIA CAUTION Every circuit in the drawout case has an auxiliary brush It is especially important on 9 10 CONNECTING PLUG MAIN BRUSH CONNECTING BLOCK i1 AUXILIARY BRUSH TERMINAL BLOCK SHORTING BAR NOTE AFTER ENGAGING AUXILIARY BRUSH CONNECTING PLUG TRAVELS 4 INCH...

Page 15: ...fore this setting gives the max Imum time setting The primary adjustment for the time of oper ation of the unit is made by means of the time dial However further adjustment is obtained by moving the permanent magnet along its supporting shelf moving the magnet toward the main shaft of the unit decreases the time while moving It away increases the time If selective action of two or more relays is r...

Page 16: ... necessary until the armature just touches the pole face of the upper core In this position the armature should be about 1 32 inch from the pole face of the lower core Next slide the bracket in until the armature leaf spring assumes a vertical position and is FigJ9 Test Connections for Testing Pickup Time Curve of JAC Relays spaced clear of both armature and the vertical tip of the bracket With th...

Page 17: ...ths ACCEPTANCE TESTS A MAIN UNIT Pickup ELECTRICAL Set the relay at the 0 5 time dial position and minimum tap Using the test connections of Figure 19 the main unit should close its contacts within 5 of tap value current Time Test Set the relay at the 5 0 time dial position and minimum tap Using the test connections of Figure 19 and applying 5 times pickup current the relay should operate at 1 31 ...

Page 18: ...G MTG 2 5 16 18 STUDS FUR SURFACE MTG 75 MM 1 4 DRILL 4 HOLES 1 0 32 STUDS STUD NUMBER I NG 97531 00000 00000 10 8 6 2 6 187 157MM BACK VIEW 5 8 DRILL 2 HOLES l5Mi 4 406 12MM I CUTLUT CUTOUT MAY REPLACE DRILLED HOLES 8 812 223MM 1 156 29MM 218 5MM 843 i 72MM 1 5 687 14 4MM 5 25 133MM 500 12MM TYPICAL 3 4 DRILL 10 HOLES 19MM TYPiCAL DIM INCHES MM 5 16 18 STUD 3 0 76MM VIEW SHOWING ASSEMBLY OF HARDW...