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GEH-1791 

2. 

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. 

MECHANICAL  ADJUSTMENTS 

1. 

The  moving  contact  should  just  touch  the  secondary  contact  when  the  time  dial 

is  set  at  the  0  position. 

If  readjustment  is  necessary,  loosen  the  two 

clamping  screws  which  fasten  the  stop  arm  to  the  shaft,  and  change  the  position 
of  the  stop  arm  relative  to  the  moving  contact  until  the  contacts  just  touch 

with  the  time  dial  set  at  0. 

A  fine  adjustment  can  be  obtained  by  moving  the 

stationary  contact  brush  in  or  out  by  means  of  its  adjusting  screw. 

However, 

in  the  final  adjustment,  the  contact  brush  must  be  positioned  so  that  there  is 
1/6411  to  1/3211  wipe  with  the  contact  fully  closed.  Be  sure  that  the  screws  are 
securely  tightened  after  adjustment  is  made. 

2. 

The-stop  arm  leaf  spring  should  deflect  at  least  1/6411  when  the  synchronism­

check  unit  is  de-energized. 

3. 

The  disc  and  shaft  assembly  should  have  a  vertical  end  play  of  1/1611  to  1/3211 

and  both  bearing  screws  should  be  tight. 

The  disk  should  be  approximately 

centered  between  the  poles  of  the  U-magnet  and  drag  magnet. 

ELECTRICAL  ADJUSTMENTS 

Connect  the  relay  as  shown  in  Figure  11. 

To  make  an  accurate  adjustment  of  the 

closing  angle,  a  phase  shifter  and  phase  angle  meter  are  required,  along  with  a 
means  for  voltage  control. 

Two  adjustments  are  necessary  for  obtaining  a  desired  closing  angle. 

adjustable  resistor  at  the  top  of  the  frame  permits  equalizing  the 

That  is,  the  closing  angle  will  be  the  same,  whether  one  voltage 

lagging  the  other  voltage. 

The  right-hand 

closing  angle. 

is  leading  or 

The  left-hand  adjusting  resistor  is  for  obtaining  the  correct  closing-angle  setting. 

Simultaneous  adjustments  of  the  two  resistors  are  necessary. 

Using  the  connections  shown  in  Figure  11,  set  V1  at  115  volts. 

If  a  200  closing 

angle  is  desired,  set  V2  at  115  volts,  leading  V1  by  200. 

Adjust  the  left-hand 

resistor  until  the  contacts  just  close. 

Now,  with  115  volts  in  both  circuits, 

determine  the  angle  at  which  the  contact  closes  with  V2  lagging  V1. 

If  the  two 

angles  are  unequal,  equalize  then  at  200  by  adjusting  the  right-hand  resistor.  Then 
check  the  closing  angle  with  V2  leading  V1,  and  readjust  if  necessary. 

Continue 

this  procedure  until  the  relay  contacts  just  close  for  V1  leading  or  lagging  V2  by 
200.  Use  the  same  procedure  for  other  closing-angle  setting. 

9 

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Summary of Contents for IJS51A

Page 1: ...Types IJS51A and IJS52A INSTRUCTIONS SYNCHRONISM CHECK RELAYS GEH 179111 GE Meter and Control 205 Great Valley Parkway Malvern PA 19355 0715 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 2: ...ENS 6 CONSTRUCTION 6 RECEIVING HANDLING AND STORAGE 6 ACCEPTANCE TESTS 7 INSTALLATION PROCEDURE 7 PERIODIC CHECKS AND ROUTINE MAINTENANCE 8 SERVICING 9 Closing Angle Adjustment 9 Time Characteristics 10 RENEWAL PARTS 10 Cover Photo 8007016 2 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 3: ... be considerably out of phase due to load transfer around the loop that is open at the breaker controlled by the relay Forms of the relay are available with a rated calibration range up to 600 but for settings over 200 consideration should be given to the resulting generator stresses at the instant of closure through existing system impedances as in any other situation involving out of phase closu...

Page 4: ...le is considered standard however other settings may be made as indicated by the voltage phase angle characteristics shown in Figure 1 The time delay characteristics of the Type IJS relay are obtained primariy by the time dial setting The time dial controls the distance the contacts must travel before closure and hence controls the time delay At No 10 time dial setting the travel is maximum wherea...

Page 5: ... from 0 2 up to 2 0 amperes at the minimum control voltage If this tap is used with circuits requiring more than 2 amperes there is a possibility that the 7 ohm resistance will reduce the current to so low a value that the proper current may not be obtained The 2 0 ampere tap should be used with circuits that take 2 0 amperes or more at minimum control voltage provided the current does not exceed ...

Page 6: ...e connection plugs have been inserted The relay case is suitable for either semi flush or surface mounting on all panels up to 2 inches thick and appropriate hardware is available However panel thickness must be indicated on the relay order to ensure that proper hardware will be included For outline and drilling dimensions see Figure 15 RECEIVING HANDLING AND STORAGE These relays when not included...

Page 7: ...tact when the time dial is set at 0 The contact wipe should be approximately 1 3211 3 Check that the control spring is not deformed and that the spring convolutions at No 5 time dial setting are reasonably concentric ELECTRICAL TESTS Connect the relay as shown in Figure 11 and check the following 1 Check that with at least 115 volts 60 cycle single phase source connected to both operating coils th...

Page 8: ...o studs 5 6 is adjusted until the synchronizing check unit just closes its contact The difference between the two voltages should agree approximately with the voltage given on the curve shown in Figure 14 for the phase angle used i e 24 volts for 200 closing When using connections shown in either Figure 11 or Figure 13 check the operating time at 0 displacement with 115 volts on each coil using th...

Page 9: ...hould be approximately centered between the poles of the U magnet and drag magnet ELECTRICAL ADJUSTMENTS Closing Angle Adjustment Connect the relay as shown in Figure 11 To make an accurate adjustment of the closing angle a phase shifter and phase angle meter are required along with a means for voltage control Two adjustments are necessary for obtaining a desired closing angle adjustable resistor ...

Page 10: ...ficient quantities of renewal parts should be kept in stock for the prompt replacement of any that are worn broken or damaged When ordering renewal parts address the nearest Sales Office of the General Electric Company Specify the name of the part wanted quantity required and complete nameplate data including the serial number of the relay If possible give the General Electric requisition number o...

Page 11: ...nts with Rated Voltage Maintained on One Circuit CONNECTING PLUG AUXIL IARY BRUSH BLOCK TERMINAL BLOCK SHORTING BAR NOTE AF TER ENGAG ING AUXIL IARY BRUSH CONNECTING PLUG TRAVELS 1 4 INCH BEFORE ENGAG ING THE MAIN BRUSH ON THE TERMINAL BLOCK Figure 2 8025039 Cross Section of Drawout Case Showing Position of Auxiliary Brush and Shorting Brush 11 w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 12: ...ic of 60 Cycle Relay 12IJS51A1 With Rated Voltage On Both Circuits With 10 Time Dial Settings Figure 4 8007013 Type IJS51A Relay Unit in Cradle Rear View 9 1 8 1 u J en _ 7 w I 6 0 0 0 0 0 0 50 en 0 z 8 4 w en w 3 I z 2 w a 0 0 0 0 10 0 I i I I c I i lfzo CLOSING ANGLE i I J30 CLOSING ANGLE i I I I j 1 l I u 4 0 gw G v 1 v I i f I f i 1 v J I I v I __ _ V 6oo CLOSING ANGLE i J I 50 40 30 20 10 0 1...

Page 13: ...age on Both Circuits With 10 Time Dial Settings Sl OUND _j SHADING COILS t l I 1 2 l l 5 6 l 7 I8 OOT REST SHORT F I NGER Figure 9 6305898 3 Internal Connec tions For Type IJS51A Relay Front View I 20 16 12 V 0 0 u I II 8 v 4 v ov 2 i 1 I v I v I v I I I 4 6 TilliE DIAl SETTING i v v 8 10 Figure 8 6400150 2 Operating Time of Type IJS Relay With 200 Closing Angle Time at oo 115 Volts 60 Cycles on B...

Page 14: ... G CIRCUIT OF oi Hl DEVICE FUNCTION NUMBERS 25 SYNCHRONISM CHECK RE LAY TYPE IJS 278 BUS UNDERVOLTAGE RELAY TYPf HGA14AR 27L LINE UNDERVOLTAGE RELAY TYPF fjGA14AR 52 POWER CIRCUIT BREAKER 52C S CONTROL S ITCH TYPE SB 1 Figure 12 6209561 5 Typical Elementary Diagram of External Connections Type IJS Relays 100 l 90 v i 80 70 I i 0 u 7 t 60 c I __ z I 0 u 50 I 0 _ 1 40 r f 7 I I f __ ll 30 i 20 0 N 7...

Page 15: ...6MM 4 375T 111MM _L__ l I CUTbUT I I I I I 5 687 144MM 112MM j_ 8 81 223M 2 M I 2 18 r 5MM I I PANEL I FOR PANEL DRILLING SEMI FLUSH MOUNTING FRONT VIE 718 1 8MM TYPICAL DIM 3 0 I 76MM 3 4 DRILL 10 HOLES 19MM PANEL DRILLING FOR SURFACE MOUNTING FRONT VIEW 5 16 18 STUD INCHES MM VIEW SHOWING ASSEMBLY OF HARDWARE FOR SURFACE MTG ON STEEL PANELS Figure 15 6209271 8 Outline and Panel Drilling Dimensio...

Page 16: ...ST 9 93 200 16 Meter and Control Business Department General Electric Company Protection and Control 205 Great Valley Parkway Malvern Pennsylvania 19355 0715 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 17: ...INSTRUCTIONS GEH 1791 E Supersedes GEH 1791 D SYNCHRONISM CHECK RELAYS TYPES IJS51A AND IJS52A GENERAL fj ELECTRIC w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 18: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 19: ...llel with those of the GES or GXS The IJS is not adaptable to applications in volving continuous loading of the contact circuit since contact welding may result even with contact loadings that are low in relation to the interrupting capacity of the contacts The control should be designed to energize the IJS coils when synchronism is to be checked and to permit the IJS contacts to be the last to co...

Page 20: ...it energized varies from 3 seconds on the 20 degree setting to 6 seconds on the 6 0 degree setting at the 10 TDS The Model 12IJS51A3 and 12IJS52A7A relays which are designed for use where the closing angle greater than 20 degrees is required provides 20 seconds delay at the 40 degree closing angle setting as shown in Fig 5 It may be adjusted to other closing angles between 20 and 60 degrees with c...

Page 21: ...Type IJS51A Relay Unit In Cradle Rear View z 9 8 1 w _ 7 Cl Cl z 0 4 u w 3 1 z 2 w 0 0 I 0 I i i 0 0 t t 0 I r I o I l r 0 1 r 0 r r r TTI i I t __j_ ll I I 1 I i I 1 I i i li I i l c u20 CLOSING ANGLE t I I 1 r 1 30 CLOSING ANGLE i lJ I v J I v l _J I I I I I 40 CLOSING ANGLE I i I I I II i I v T I I I H vv l 600 jI I j j J I V CLOSING I ANGLE I I i I I i 50 40 30 20 10 0 10 20 30 40 50 PHASE ANG...

Page 22: ... SHADING_j l t COILS 1 l I l 1 s v i I 6 TOP RfST l l i l8 BOT REST SHORT FINGER it 8 6305ScJ8 3 Intt mal Connections Fo r Type LTS lA Relay Front View V 0 z o VJ I w 20 1 1 c I f I I lb r 1 i 1 I 12 I r t I I I I 4 rr l t t A 1 I I r J I 1 I _____J_ 4 t r _j I I I I I j tT j I 4 6 10 TIME QiAL SUTING Fig 7 6400150 2 Operatine I ime o Type IJS Relay With 2JO Closing Angle Time At 0 115 Volts 60 Cy...

Page 23: ...esired To do this the relay is first disconnected by removing the connection plug which completes the electrical connections between the case blocks and the cradle block To test the relay in its case this connection block can be replaced by a test plug The cover which is attached to the front of the relay case contains an inter lock arm which prevents the cover from being replaced until the connec...

Page 24: ...tion A typical elementary diagram of external con nections is shown in Fig 11 The B 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 avail able as soon as possible in case the breaker trips again Additional relays undervoltage or reclosing may be considered desirable for prevention of unli...

Page 25: ...C H E C K R E L A Y T Y P E I J I 2 7 8 BUS U N O E RV O L T AGE R E L A Y T Y PF H A14AR 2 7 L L r N E U N OERVO L T A G E R E L A Y r T Y P flGA 4A l 5 2 POW E R C I RC U I T B R E A KE R 5 Z C S CO N T RO L W I TC H T Y P E 58 l Fig 11 6209561 4 Typical Elementary Diagram Of External Connections Type IJS Relays 100 T I 90 1 80 70 u I 60 1 II 1 I 0 u 50 1 I 5 1 4 0 I l 7 1 3 0 1 f7 I I 20 i 10 I...

Page 26: ...en the poles of the U magnet and drag magnet ELECTRICAL ADJUSTMENTS Closing Angle Adjustment Connect the relay as shown in Fig 10 To make an accurate adjustment of the closing angle a phase shifter and phase angle meter are required along with a means for voltage control Two adjustments are necessary for obtaining a desired closing angle The right hand adjustable resistor at the top of the frame p...

Page 27: ...12 223M M 1 5 M M DRI LL El 2 H OLES CUTOUT M AY R EPLACE D R ILLED H OLES O PT I ONAL 2 M M 1 1 6 __ L 7 1 ts Tt tttl t S t3 VIEW SHOWING t8 t A t A ASSEME Y OF HARDwA RE FOR SU RFACE MTG 0 N STEEL PA N EL5 PANEL DRIWNG F SEM J FWSH MOUN TI NG t F RONT VIE W DR I L L 1 0 HOLES 19M M PANEL ORI LUNG FOR 9JRFACE OUNTI NG TF RONT V IE W F i g 14 6 2092 7 1 6 Ou tl i ne And Pa ne l Dr i l l i ng Dimen...

Page 28: ...N ERA L ELECT R I C COMPANY P O W E R SYST E M S M A N A GEMENT BU SINESS DEPT P HILADELPHIA P A 1 91 4 2 G E N E R A L f j E L E C T R I C 5 80 1 0 6 5 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

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