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Westinghouse KAB, Инструкция по установке, эксплуатации и обслуживанию, Страница: 19 / 92

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T Y PES  CA-16  AND  CA-26  RE LA YS 

41-337.3F 

INTERNAL  SCHEMATIC 

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TANEOUSPOLARITIESAS 

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TEST  SWITCH 

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185A419 

Fig. 

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Internal  Schematic  of  the  Type 

CA- 1 6  

f>us  Relay 

or 

CA-26 

Transformer  Relay. 

laminated  electromagnet  with  an  auto-transformer 
winding  on  its  center  leg.  Two  identical  coils  on the 
outer  legs  of  the  laminated  structure  are  connected 

to  the  secondary  (tapped  section)  of  the  auto-trans­
former  winding  in  a  manner  so  that  the  combination 
of  all  fluxes  produced  by  the  electromagnet  results 
in  out-of-phase  fluxes  in  the  air  gap.  The  out-of­

phase  air  gap  fluxes  cause  a  contact  closing  torque. 

S e n s i t ive  Faul t  D e t e c tor  C i rc u i t   (w h e re  us e d )  

The  sensitive  fault  detector  circuit  consists  of 

an  auto-transformer  and  a  contactor  switch.  The  con­
tactor  switch  is  connected  across  the  secondary 
(tapped  section)  of  the  auto-transformer  winding. 

The  contactor  switch  is  a  small  solenoid  t ype 

element.  A  cylindrical  plunger  rides  up  and  down  on 
a  vertical guide  rod in  the  center  of  the  solenoid  coil. 
The  guide  rod  is  fastened  to  the  stationary  core, 

which  in  turn  screws  into  the  unit  frame.  A  silver 

disc  is  fastened  to  the  moving  plunger  through  a  heli­

cal  spring.  When  the  coil  is  energized,  the plunger 
moves  upward  carrying  the  silver  disc  which  bridges 
three  conical- shaped 

stationary  contacts.  In  this 

position,  the  helical  spring  is  compressed  and  the 
plunger  is  free  to  move  while  the  contact  remain s 
stationary.  Thus,  a-c  vibrations  of,  the  p lunger  are 
prevented  from  causing  contact  bouncing.  A  Micarta 
disc  is  fastened  to  the  bottom  of  the  guide  rod  by 

30TT

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INTERNAL  SCHEMATIC 

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FRONT  VIEW 

BOTTOMlEFTHANO 

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AUTCTRANSFORMER 

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TRIP  ATTACHMENT 

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SHORTING  SWITCH 

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TE��I MAL 

185A443 

Fig. 

4 

Internal  Schematic  of  the  Type 

CA- 1 6  

Bus  Relay 

or 

CA-26 

Transformer  Relay. 

two  small  nuts.  Its  position  determines  the  pick  up 
current  of  the  element. 

The  auto-transformer  is  designed  to  saturate  at 

high  values  of  current  to  limit  the  amount  of  curren t  
to  the contactor  switch. 

I n d i cat i n g   C antactar  S w i t c h  Un i t   (IC S )  

The  d-e  indicating  contactor  switch  i s   a  small 

clapper  type  device.  A  magnetic  armature,  to  which 
leaf-spring  mounted  contacts  are  attached,  is  at­
tracted  to  the  magnetic  core  upon  energization  of the 

switch.  When  the  switch  closes,  the  moving  contacts 
bridge  two  stationary  contacts,  completing  the  trip 
circuit.  Also  during  this  operation  two  fingers  on the 

armature  deflect  a  spring  located  on  the  front  of  the 

switch,  which  allows  the  operation  indicator  target 

to  drop.  The  target  is  reset  from  the  outside  of  the 
case by  a push  rod  located at  the  bottom  of  the  cover . 

The  front  spring,  in  addition  to  holding  the  target, 

provides  restraint  for  the  armature  and  thus  controls 
the pick-up  value of  the  switch. 

Indicati n g   In s tantan eous  T r i p   U n i t   (l iT ) 

Fault  Detector  (FD) - w he n  us ed 

The  instantaneous  trip unit  is  a  small a-c operated 

clapper  type  device.  A  magnetic  armature,  to  which 
leaf-spring 

mounted  contacts  are  attached,  is  at ­

tracted  to  the  magnetic  core  upon  energization  of  the 

3 

www 

. ElectricalPartManuals 

. com 

Содержание KAB

Страница 1: ...t s is not recommend ed If this cannot be avoided the additional impedance from the auxiliary ct s and the high voltage which transformed by the auxiliary ct should be checked SUPERSEDES I L 41 337 4...

Страница 2: ...pring adj uster is also held in place by a spring ty pe clamp With the contacts closed the electrical connec tion is made through the stationary contact housing 2 clamp to the mo ving contact through...

Страница 3: ...overstress the insula tion A varistor is connected internally to reduce this voltage Figure 2 shows the electrical char acteristics of this device The overvoltage unit is a high speed device and will...

Страница 4: ...ce Rs 0 93 n and one way l ead resistance to junction point RL 1 07D A SETTING OF VOL TAGE UNIT 4 a for 3 phase fault condition Rs t RL _l_r I VK 0 93 1 07 N from Fig 3 K 0 76 60000 l I 375 400 0 9 V...

Страница 5: ...g enough to trip a breaker I L 41 337 4A BU R D E N The relay burden is approximately 2600 ohms in the tuned circuit However this burden is not seen by any of the CTS during normal operation or during...

Страница 6: ...y be necessary to re adjust the overvoltage unit spring for the desired operate voltage 6 Overvoltage Unit V 1 The upper bearing screw should be screwed down until there is approximately 025 clear anc...

Страница 7: ...he voltage should measure 175 volts ac 10 A high resistance voltmeter should be used R E N EWAL PAR T S Repair work can be done most satisfactorily at the factory However interchangeable parts can be...

Страница 8: ...vv _ I _ _ _H t 0 0 LO ID t 0 0 0 0 q ci PEAK CURRENT AMPERES Fig 2a Typical Volt Ampere Characteristic of Varistor in Type KAB Relay Peak Value I I I I 0 I I II 349 7A22 Ol 1 c Vl 1J om o mOl O t m z...

Страница 9: ...300 200 100 01 o V 0 1 AMPERES RMS Fig 2b Typical Volt Ampere Characteristic of Varistor in Type KAB Relay RMS I I v 10 Curve 619414 OJ l c V om n Tl mOJ O r m zC1 l r r3 l om mo r z r w w m w E l e...

Страница 10: ...75 0 50 0 25 10 20 30 40 so 60 70 so 90 1 00 1 10 1 20 1 30 VR MARGIN FACTOR K IRs RLI t Fig 3 Margin Factor for V Unit Setting 1 40 1 50 I CJ j C tl om l I mCJ Oz m zc I j I r om I m e r Z n m 1 60...

Страница 11: ...2 3 1 I 4 5 6 8 1 0 IJ I j I J 4U 3U zn I 7 1 J ll J I I I I I R S R L 5 0 I v r vy P As RL 0 75 1 0 1 j J t 1 5 6 7 8 10 15 20 30 40 50 60 70 80 100 IT UNIT SETTING AMPERES AMSl Fig 4 IT Unit Setting...

Страница 12: ...L LOCKOUT RELAY 52 BREAKERS NOTE RELAY TERMINALS 8 9 810 SHOULD BE OPEN WHEN CLRCUIT BREAKER OR BREAKERS IS TO BE BYPASSED FOR MAINTENANCE OR WHEN ANY OTHER ABNORMAL SETUP IS TO BE MADE I T y_ I 8 _7_...

Страница 13: ...DANCE BUS DlFFE R ENT lA L R ELAY L 4 1 3 _ 3 7 4A Gl t 0 IL Gl 01 0 I L E lz 0 J I 0 0 Gl E 0 0 Gi a 0 c u a N o o 0 Gi co t 0 0 u __ N S3l A 3VIIIl E Nil f 3d0 13 w w w E l e c t r i c a l P a r t M...

Страница 14: ...SCIEW II FOR THICK fiAIIEL USE 6 TERNIMAL AIID IQINTING DETAILS li 18 STUD _ 190 32 SCREW FOR THICK PANEL USE 190 32 STUO 3 DIA IO IIOL S Olt CUT OUT J1 e 1 _DIA IJ KOU S flll 2 1 _ 1 110 12 m aaBrl...

Страница 15: ...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...

Страница 16: ...WESTINGHOUSE ELECTRIC CORPORATION RELAY INSTRUMENT DIVISION NEWARK N J Printed in U S A 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...

Страница 17: ...ed for transformer differential applications since it is too sensitive for overriding the inrush Likewise the CA 26 relay should not be used for bus protection with the four circuit bus connections of...

Страница 18: ...T Y P ES CA 1 6 AND CA 26 R ELAYS ________________________ 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...

Страница 19: ...uncing A Micarta disc is fastened to the bottom of the guide rod by 30TT OM RI HT AliD Elf Mfn F V l lkJI ATING ONTACTO SWITCH TOPLHTII 0 LE E T F 1 OTE WITH flATIH I SUN TAN OUS POLA ITI S AS h IIN T...

Страница 20: ...I ao Ht 40 f t 0 20 0 60 80 100 120 140 160 OPERATING CURRENT IN AMPERES Curve 537956 Fig 6 Typical Time Curves of the CA 1 6 and CA 26 dif ferential Relays polarity as indicated above their effect w...

Страница 21: ...amperes at 250 volts d e and will c arry this current long enough to trip breaker The indicating contactor switch has two tap s that provide a pick up setting of 0 2 or 2 amperes To change taps requi...

Страница 22: ...9 connections where there are more than three sources the source CT s should be par allelled to reduce the effective number of source con nections to three The four circuit bus connec tions of Fig 8...

Страница 23: ...N D M AI N T E N A N C E The proper adjustments to insure correct operatio n of this relay have been made at the factory Upon receipt of the relay no customer adjustments other than those covered und...

Страница 24: ...it has no t arg et F Sens itive F a u lt Detec tor w h ere s upp l ied Apply current to terminals 14 and 15 of the re l ay The fault detector should operate between the limits of 0 14 2 to 0 158 amper...

Страница 25: ...t clo se in the following times CA 16 52 5 milliseconds CA 26 72 5 milliseconds These times should be the average of 5 readings 5 lnd icating C o ntactor S w i t c h IC S Close the main relay contacts...

Страница 26: ...e operating current to trip the relay for dif ferent restraint current for one restraint element as 1 0 well as for six restraint elements connected in series R E N E W A L P A R T S Rep air work c an...

Страница 27: ...RENT CAN EXCEED TWICE TttE EXTERNAL FAUlT CURRENT SET P ICK UP EQUAL TO MAXIMUM EXTERNAL FAULT CURRENT 1 3 A c AUX CURREMT BALAMCE CURRENT TRAitS 87 i9 7 87 87 8 12 PHASE 2 SAME AS PH H o 15 POS r 1 I...

Страница 28: ...25 16 q DIA HOLES FOR s ff r 32 Uftn J oo f 4_ PANEL CUTOUT DRI LLIJG FOI SEMI FLUSH MTG PAREL DRI LLIIIG OR CUTOUT FOR PRQJECTJOII MTG FROIIT Y I EW 57 D 7903 6 f Fig 15 Outline and Drilling for the...

Страница 29: ...ed i ssue T _ h e CA 6 re lay sho o be u _ til zed for tra s form er differential appllcat iiJ i_ since It IS too se nsitive for overriding the i nrus h _ Likewise the C A 26 relay shoul d not be us e...

Страница 30: ...T T YP ES CA 16 AND CA 26 R ELAYS _ ___________ _ _ _ _ _ _ __ _____ i c Ill a u Ill Cl 1 IJ 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...

Страница 31: ...evented from causing contact bouncing A Mic arta disc is fastened to the bottom of the guide rod by BOTTOM R I GHT II I IID ELEMEIH F V IHD ICATIMG CONTA CTOR SWITCH CA U 00 CA 26 TOP LEFT ltAIID ELEM...

Страница 32: ...2 CA 6 ll 00 40 20 40 60 80 100 120 160 OPERATING CURRENT IN AMPERES j_ _ _ _ _ _ _ _ _ _ Curve 537956 Fig 6 Typ ical Time Curves of the CA 1 6 and CA 26 dif ferential Relays polarity as indicated abo...

Страница 33: ...reaker The indicating instantaneous trip contacts will safely close 30 amperes at 250 volts d e and will carry this current long enough to trip breaker The indicating contactor switch has two taps tha...

Страница 34: ...s the source CT s should be par allelled to reduce the effective number of source con nections to three The four circuit bus connec tions of Fig 8 are not recommended to be used for bus protection wit...

Страница 35: ...rrect operation of this relay have been made at the factory Upon receipt of the rel ay no customer adjustments other than those covered under SETTINGS should be required Ac ceptance C h ec k The follo...

Страница 36: ...y suf ficient current to operate the liT F Sen s i t i ve F au l t D etec to r w here s u pp l ied Apply current to terminals 14 and 15 of the re lay The fault detector should operate between the limi...

Страница 37: ...A 26 72 5 milliseconds These times should be the average of 5 readings 5 lnd icating C o n tactor Sw itc h IC S Close the main rela y contacts and pass sufficient d e current through the trip circuit...

Страница 38: ...the operating current to trip the relay for dif ferent restraint current for one restraint element as 10 well as for six restraint elements connected in series R E N E W A L P A R T S Rep air work ca...

Страница 39: ...SCREW 6 FOR THICK PMIEL USE t 18 STUD r r r I I I I I TEIMIIAL MD MOLI IITIIIG DETAILS TERMIUL MI BE 25 q Oi l IJ HOLES FOI 5 9 ff r I PANEL CUTOUT DRI LLI G FOR SEMI FUJSH MTG PAIEL DRI LLIRG OR CUTO...

Страница 40: ...AESTUIIT COI L 6 TOP R H ELEM I CS I I D I CATIRG COlT SW l i T liD liST TRIP 86 AUX TRIPPIRG RELAY TYPE WL t USE WIIERE INTERNAL CURREKT CAM EXCEED TWICE TltE EXTERNAL FAULT CURRENT SET P I CK UP EQ...

Страница 41: ...se the two way lead burden CON T E N T S This instruction leaflet plies to the following SUPERSEDES I L 41 337 26 Denotes change from superseded i ssue typ es of relays CA 16 Bus Differential Relay CA...

Страница 42: ...TYPES CA 1 6 AND CA 26 R ELAYS 41 1 0 a 0 lJ Ill 41 Q 1 o i i 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...

Страница 43: ...plunger BOTTOM R I GHT HAMO HEMEIIT F V INTERNAL SCHEMATIC I N O I CATIMG COMTACTOR SWITCH 1m ICS CA 16 IC l iT c u l_ TOP LEFT IIAIID ELEMEMT F V NOTE WITH RELATIVE INSTAN TANEOUS POLAR I T I ES AS S...

Страница 44: ...14 I6C OPERATING CURRENT IN AMPERES Curve 537956 Fig 6 Typical Time Curves of the CA 1 6 and CA 26 dif ferential Relays rent transformers connected to the bus and the operating circuit is energized i...

Страница 45: ...unit when a current transformer is severely satur ated by the d e component of an asymmetrical external fault current T r i p C ir c u it The main contacts will safely close 30 ampere s ElTEIIINAL SCH...

Страница 46: ...these four sets of CT s to the rel ays p er Fig 8 The exception to this rule occurs when the application consists of three feeder groups Then Fig 9 applies With 3 feeder group s and more than 3 sourc...

Страница 47: ...ench For detailed FT case information refer to L L 4 1 076 A D J U S T M E N T S A N D M Al N T E N A N C E The proper adjustments to insure correct operation of this relay have been made at the facto...

Страница 48: ...0 The making of the contacts and target indic ation should occur at approximately the same instant Position the stationary contact for a minimum of 1 3 2 inch wipe The bridging moving contact should t...

Страница 49: ...keep er of the permanent magnet until the contacts just clo se in the following times CA 16 52 5 milliseconds CA 26 72 5 milliseconds These times should be the average of 5 readings 5 lnd icating C o...

Страница 50: ...relay for dif TEI MIMAL AIID MOUMTIIG DElliLS ferent restraint currents for one restraint element as well as for six restraint elements connected in series R E N E W A L P A R T S Rep air work can be...

Страница 51: ...l t USE WHERE I NTERNAL CURRENT CAN EXCEED TlfiCE THE EXTERNAL FAULT CURRENT SET P I CX UP EQUAL TO MAX I EXTERUL FAULT CURRENT A A AUX CURREMT BALAMCE CURRENT TRAU POS I C S AUK CURRENT 2 R S T Ill I...

Страница 52: ...WESTIN G H O USE E L E C T R I C C O R P O R ATI O N RELAY INSTRUMENT DIVISION NEWARK N J Printed in U S A 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...

Страница 53: ...N FOUR EQUIVALENT CIRCUITS DC TIME CONSTANT OF 0 6 CYCLES 0 01 Sec OR MORE The same requirements as in A apply How S UPERSEDES I L 41 337 1C Denotes ch ange from superseded i ssue ever consideration m...

Страница 54: ...pper type device A magnetic armature to which 2 TOP FKOtH El f 4ENT F INTERNAL SCHEMATIC TOP REAR ELEMENT F Y J J 1NO I CAf l MG COnfACTOR Sifil fCH IMOICATING ICS J I C I l l IMSTAn TArtEO JS TRIP Ai...

Страница 55: ...unt of restraining w _J 0 0 w _J 0 0 r 20 I I I l s l i It _ 0 o 20 40 60 80 NET TORQUE IN CENTIMETER GRAMS Curve 235496 Fig 4 Typical Differential Unit Time Curve torque as indicated in Fig 3 Similar...

Страница 56: ...rmers will be much greater than would ever be e xpected from a consideration of the usual ratio curves of the current transformers involved CHARACT E RISTICS There are no taps inside the relay case Ta...

Страница 57: ...S POs DEV I CE NUMBER CHART PH 1 87 PERCENTAGE D IFFERENTIAL RELAY TYPE CA 6 r r y TO BREAKER TR I P CO I LS NEG _ _ _ _ _ _ _ _ _ _ _ _ ICS I ND I CATING COMTACTOR SWI TCH OP OPERATI NG CO I L R PA I...

Страница 58: ...PH 3 87 PERCENTAGE DtFFERENTIAL RELAY TYPE CA 6 ICS I ND I CA T I N G CONTACTOR SWI TCH OP OPERATING COI L R PA I RED RESTRA I NT COI L TOP FRONT ELENENT S PA I RED RESTRA INT CO I L BOTTOM REAR ELEM...

Страница 59: ...O I LS 87 PERCENTAGE D I FFERENT IAL RELAY TYPE CA 6 ICS I ND I CAT I NG CONTACTOR SW I TCK OP OPERATING CO I L R PA I RED RESTRA INT CO I L TOP FRONT ELEMENT S PA I RED RESTRA I NT CO I L 80T TOI4 RE...

Страница 60: ...SW I TCH OP OPERATINu CO I L R PA I RED R ESTRA INT CO I L TOP FRONT ELEMENT s PA I RED RESTRA I N T CO I L BOTTOM REAR ELEMENT T PA I RED RESTRA I NT CO I L BOTTOM FRONT ELEMENT PH 1 TYPE CA 6 IN TY...

Страница 61: ...der that the relay maybe given a higher minimum trip setting as noted under Ad justments and Maintenance TRIP CIRCUIT The main contact will safely close 30 amperes at 250 volts d e and the seal in con...

Страница 62: ...ed 5 of the total phase or ground fault cur rent with normal bus connections In paralleling current transformers for the feeder group or groups the load current distribution should be examined to insu...

Страница 63: ...rces if there are less than 8 equivalent circuits 3 Avoid pairing the two largest sources 4 If feasible parallel matched current trans formers In case IV with two feeder groups one of the restraint el...

Страница 64: ...12 of pick up desired It is recommended that a pickup of 100 amperes be used I N S TA L L A T I O N Th e relays should be mounted o n switchboard panels or their equivalent in a location free from dir...

Страница 65: ...ommended for this purpose The use of abrasive material for clean ing contacts is not recommend ed because of the danger of embedding small particles in the face of the soft silver and thus impairing t...

Страница 66: ...W FOR T H I C K PA N E L U S 1 90 U STUD T E R M I N A L AN D M O U N T I N G D ETA I LS N OTE ALL OIME N SIONS Ito I N C I IE I t D I A 4 H O L E S O R I S 2 2 MT S C R Ew5 PA N E L C UT O UT D R I L...

Страница 67: ...6 Relay Without Case Rear View J Top Rear Operating Element 2 Stationary Contact 3 Moving Contact 4 Control Element 2 Bottom Rear Restraining Element Spring Assembly 5 Bottom Front Restraining Element...

Страница 68: ...W E S T I N G H O U S E E L E C T R I C C O R P O R A T I O N R E LAY D E PA RTM E N T N EWA R K N J Printed in U S A 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...

Страница 69: ...l 337 3A Denotes change from superseded i ssue The CA l relay should not be utilized for transformer differential applications Likewise the O A 26 relay should not be used for bus p rotection with the...

Страница 70: ...N Fig 1 Types CA 1 6 Relay front view Fig 2 Typ s CA 1 6 Relay rear view t m n I 0 z 0 n p 0 tl m r E l e c t r i c a l P a r t M a n u a l s c...

Страница 71: ...remain s stationary Thus a c vibrations of the plunger are prevented from c ausing contact bouncing A Micarta disc is fastened to the bottom of the guide rod by BOTTOf I RIGHT IIA ND HEMEMT F V TOP L...

Страница 72: ...60 80 100 120 140 160 OPERATING CURRENT IN AMPERES Curve 537956 Fig 6 Typical Time Curves of the CA 1 6 and CA 26 dif ferential Relays polarity as indicated above their effect will be addi tive and th...

Страница 73: ...stantaneous trip contacts will safely close 30 amperes at 250 volts d e and will carry this current long enough to trip breaker The indic ating contactor switch has two taps that provide a pick up set...

Страница 74: ...Fig 9 connections where there are more than three sources the source CT s should be par alleled to reduce the effective number of source con nections to three The four circuit bus connec tions of Fig...

Страница 75: ...ion of this relay have been made at the factory Upon receipt of the relay no customer adjustments other than those covered under SETTINGS should be required Ac ceptance C h ec k The following check is...

Страница 76: ...RESTRA INT COH IM TOP L EL 11 PE T PAIRED RESTUIIT COI L n 26 TOP R M EL 11 I CS I I D I CATIIG COlT SW I IT IIO liST TR I P 116 AUX TI IPPIIG RELAY TYPE Wl t USE wrtERE IMTEINAL CURRENT CAM EXCEED T...

Страница 77: ...AN FOUR EQUIVALENT CIRCUITS DC TIME CONSTANT OF 0 6 CYCLES 0 01 Sec OR MORE The same requirements as in A apply How S UPERSEDES I L 41 337 1C Denotes ch ange from superseded i ssue ever consideration...

Страница 78: ...ntact is made thru the spiral spring to the spring adjuster INDICATING CONTACTOR SWITCH UNIT ICS The d e indicating contactor switch is a small clapper type device A magnetic armature to which 2 INTER...

Страница 79: ...Curve 235496 Fig 4 Typical Differential Unit Time Curve torque as indicated in Fig 3 Similarly a current of 5 amperes flowing in at termiRal 16 and out of terminal 17 will produce an equal amount of...

Страница 80: ...al ratio curves of the current transformers involved CHARACT E RISTICS There are no taps inside the relay case Taps 4 controlling the sensitivity of the relay are incorpor ated in the external current...

Страница 81: ...CENTAGE D I FFERENTIAl REl AY TYPE CA 6 r r y TO BREAKER TR I P CO I LS NEG _ ICS I ND I CATI NG COKTACTOR SWI TCH OP OPERATING CO I L R PA I RED RESTRAI NT CO I L TOP FRON T El ENENT S PAI RED RESTRA...

Страница 82: ...NUMBER CHART 87 PERCENTAGE DtFFERENTIAL RELAY TYPE CA 6 ICS I ND I CATING CONTACTOR SWI TCH OP OPERATING COI L R PA I RED RESTRA I NT COI L TOP FRONT ELEMENT S PA I RED RESTRA I NT COI L BOTTOM REAR...

Страница 83: ...ER TRIP COILS 87 PERCENTAGE DIFFERENTIAL RELAY TYPE CA 6 ICS INDICATING CONTACTOR S ITCii OP OPERATING COIL R PAIRED RESTRAINT COIL TOP FRONT ELEMENT S PAIRED RESTRAINT COIL BOTTOM REAR ELEMENT T PAIR...

Страница 84: ...R SW I TCH OP OPERA T I N G CO I L R PA I RED R ESTRA I N T CO I L TOP FRONT ELEMENT S PA I RED RESTRA I N T CO I L BOTTOM REAR ELEMENT T PA I RED RESTRA I N T CO I L BOTTOM FRONT ELEMENT lM TYPE CA 6...

Страница 85: ...t the relay maybe given a higher minimum trip setting as noted under Ad justments and Maintenance TRIP CIRCUIT The main contactE will safely close 30 amperes at 250 volts d e and the seal in contacts...

Страница 86: ...eed 5 of the total phase or ground fault cur rent with normal bus connections In paralleling current transformers for the feeder group or groups the load current distribution should be examined to ins...

Страница 87: ...there are less than 8 equivalent circuits 3 Avoid pairing the two largest sources 4 If feasible parallel matched current trans formers In case IV with two feeder groups one of the restraint elements...

Страница 88: ...12 of pick up desired It is recommended that a pickup of 100 amperes be used I N S T A L L AT I O N The relays should be mounted on switchboard panels or their equivalent in a location free from dirt...

Страница 89: ...commended for this purpose The use of abrasive material for clean ing contacts is not recommend ed because of the danger of embedding small particl es in the face of the soft silver and thus impairing...

Страница 90: ...I C K PA N E L U S 1 90 32 5TUD T E R M I N AL i _ N D 1 0 U NT I N C D ETA I LS NOTE Al L DIME N SIONS IH I N C I E t D I A 1 H O L E S FOR 1 s MTE S C R Ew S PA N E L C Ut O UT DR I L L tNC1 F O R S...

Страница 91: ...y Without Case Rear Vie Element 2 Stationary Contact 3 Moving Contact 4 Control Spring A ssembly 5 Bottom Front Restraining Element 6 Indicating Contactor Switch ICS E lement 2 Bottom Rear Restra in i...

Страница 92: ...WEST I NGHOUSE ELECTRIC CORPORATION RELAY INSTRUMENT DIVISION NEWARK N J Printed in U S A 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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