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Summary of Contents for GE IJS51A
- Page 1 GEH- 179111' INSTRUCTIONS SYNCHRONISM-CHECK RELAYS Types IJS51A IJS52A GE Meter and Control Great Valley Parkway Malvern, PA 19355-0715...
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Page 2: Table Of Contents
GEK-1791 CONTENTS PAGE INTRODUCTION....... . . APPLICATION........OPERATING CHARACTERISTICS. -
Page 3: Introduction
The motion of the disk is retarded by permanent magnets {drag magnets) acting on the disk to give a time delay. The Type IJS51A relay has a seal-in unit mounted to the left of the disk shaft, which operates when the main contacts close. -
Page 4: Operating Characteristics
GEH-1791 The IJS is not adaptable to applications involving continuous loading of the contact circuit, since contact welding may result even with contact loadings that are low in at ion to the interrupting capacity of the contacts. The contra shou d be designed to energize the IJS coils when synchronism is to be checked, and to permit the IJS contacts to be the last to complete a closing circuit that is promptly... -
Page 5: Ratings
GEH-1791 The approximate reset time of the 12IJS51A3A and 12IJS52A7A is 130 seconds at the No. 10 time-dial setting. The approximate reset time with one coil energized varies from 13 seconds on the 200 setting to 20 seconds on the 600 setting at the No 10 time-dial setting. -
Page 6: Burdens
GEH-1791 BURDENS Burdens for the Type IJS relays are listed below. The burden for each circuit varies, depending upon the phase displacement of the two voltages, from a minimum at o o displacement to a maximum near 1800 displacement. VOLTS CYCLES CIRCUIT PHASE... -
Page 7: Acceptance Tests
GEH-1791 ACCEPTANCE TESTS Immediately upon receipt of the relay, an inspection and acceptance test should be made to make sure that no damage has been sustained in shipment and that the relay calibrations have not been disturbed. If the ex ami nation or tests indicate that readjustment is necessary, refer to the section on SERVICING. -
Page 8: Periodic Checks And Routine Maintenance
GEH-1791 ELECTRICAL TESTS Before the following electrical tests are made, the relay should be in its case, preferably mounted in its permanent location. The 11 b 11 A typical elementary diagram of external connections is shown in Figure 12. contact of 52 in series with only one coil circuit serves to reset the disk and contacts promptly after the circuit breaker closes, so that the normal delay is available as soon as possible in case the breaker trips again. -
Page 9: Servicing
GEH-1791 Check the closing time with the potentiometer set to provide 115 volts on both circuits. The time should agree with values given in Figure 8 ! 10%. SERVICING If recalibration of the relay is necessary, the following should be considered when making adjustments. -
Page 10: Time Characteristics
GEH-1791 Time Characteristics If it is necessary to adjust the time characteristics, impose the chosen conditions on the relay, using the connections shown in Figure 11, and adjust the time dial, and if necessary the drag magnet, until the correct operating time is obtained. RENEWAL PARTS Sufficient quantities of renewal parts should be kept in stock for the prompt replacement of any that are worn, broken or damaged. - Page 11 GEH-1791 AN6LE ' * T WHICH CLOSE WITH RATE VOL ON BOTH CIRCUITS Figure 1 (0165A7535-0) Typical Voltage-Phase Angle Characteristic of 115 Volt 50/60 Cycle IJS Relay for various Closing Angle Adjustments with Rated Voltage Maintained on One Circuit CONNECTING PLUG BLOCK A UXIL IARY BRUSH T ERMINAL BLOCK...
- Page 13 CO I LS OOT . RES T. \\OUND SHADING COILS '*:: *=SHORT F I NGER SHORT NGERS Figure 10 (6400419-3) Internal Connec Figure 9 (6305898-3) Internal Connec tions for Type IJS52A Relay (Front View) tions For Type IJS51A Relay (Front View)
- Page 15 PANEL LOCATION SURFACE SEMI-FLUSH <2> 5/16-18 STUDS 6.625 FOR SURFACE MTG. 168MM 8.375 212MM 9. 125 3 2 X 3/8 STUD 232MM MTG. SCREWS NUMBERING 00000 GLASS 00000 10 8 1 . 1 2 s IE'.I BACK V 29 MM 1/4 DRILL 4 HOLES DRILLED HOLES...
- Page 16 GEH-1791 Meter and Control Business Department General Electric Company -9/93 ( 200 ) Protection and Control 205 Great Valley Parkway Malvern, Pennsylvania 19355-0715...
- Page 17 INSTRUCTIONS GEH-1791 E GEH-1791 Supersedes SYNCHRONISM-CHECK RELAYS TYPES IJS51A AND IJS52A GENERAL ELECTRIC...
- Page 19 OPERATING CHARACTERISTICS energize it being interconnected elsewhere. The IJS51A should be used where a target-seal in unit is required; otherwise use the IJS52A. The operating coils , mounted on the left-hand side, produce a torque tending to close the relay such an application the voltages may be contacts.
- Page 20 GEH - 1791 Synchronism-Check Relays Type IJS on the 20 degree setting to 6 seconds on the 6 The time delay characteristics of the Type IJS relay are obtained primarily by the time-dial degree setting at the # 1 0 TDS. setting.
- Page 21 Synchronism-Check Relays Type RESISTOR CRADLE----, C:LOSING ADJUS T ABLE SEAL-IN UNIT DISK AND Fig. 2 (8007014) Type IJS51A Rel ay, Unit In C radle Fig. 3 (8007013) Type Relay, Unit In Cradle IJS51A (Front View) (Rear View) -T -- -1 .
- Page 22 Cha racteris tic Of 25- Cycle Type IJS Relay With 2JO Closin g At 0°, 115 Volts, Relay With Angle-Time Rated Volta ge On Bo t h Circuits With Time 60 Cycles On Both Circuits Dia l S e t t in g s . WOUND SHADING...
- Page 23 Synchronism-Check Relays Type LJS GEH- 1791 RATINGS CONSTRUCTION The relay components are mounted in a cradle The operating and restraining coils are con assembly which is latched into a drawout case when tinuous rated. The tap setting used on the seal unit the relay is in operation but they can be easily is determined by the current drawn by...
- Page 24 GEH-1791 Synchronism-Check Relays Type LJS turbed. the examination or tests indicate that E LECTRICAL TESTS readjustment is necessary, refer to Section on SERVICING. Before the following electrical tests are made the relay should be in its case, preferably mounted VISUAL INSPECTION in its permanent location.
- Page 25 Ol78A9l l2- 0 ) Test Connections For Single Phac: e C 1 o s i ng Angle Check Type IJS51A And IJS52A Approximate C l o s i ng Angle Adjustment Without Phase Shift e r On 1 1 5 Vol t , 60- C yc l e Relay Typ...
- Page 26 GEH - 1 79 1 Synchronism-Check Relays Type LJ S The stop arm leaf spring should deflect at least 1/64" when synchronism-check unit is de-energized. C O N �·i ECTI G P LU G M A I N B R U S H C O N N E CT I N G BLOCK The disc and shaft assembly should have a vertical end play of 1/16"...
- Page 27 Synch.-onism-Check Relays Type IJS GEH- 1 79 1 PA N EL LO C ATION SE � I -FLU S H SU R FA C E M T G G L A SS 9 7 5 3 I 10-32 -- SCREW 0 00 00 o 8 6 ����...
- Page 28 G E N E R A L E L E CT R I C C O M P A N Y P O W E R S Y ST E M S M A N A G E M E N T B U S I N E S S D E PT . P HI L A D E L P H I A, P A.