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Westinghouse KD, Instructions Manual, Page: 2 / 24

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2 

PROTECTED 

LINE 

I 

ZS 

I NTERNAL 

I 

I 

FAULT 

I 

POS 

I 

I 

FAULT 

I 

L�� 

M 

N 

p 

M ARGI N 

SET M N  )0.5 NP 

Fig. 

J. 

Phase Relay  SeHings 

OUT  OF STEP 

BLOCKING 

(WHEN USED) 

C

HA

N

N

E

L  CONTROL 

85CO  ON- OFF  SWITCH 

CONTACT 

I  2 

X 

3·4 

X 

5·6 

X 

7·8 

X 

9-10 

X 

IH2 

X 

X· 

DENOTES  CONTACT  CLOSED 

MOTES: 

I.  OPTIONAL  CONNECTION,  WHERE  T3  CONTACT  OF  T0-2 

IS  AVAILABLE  IN  BACKUP  CIRCUITS 

2.  OMIT  D0c 

IF  KRP 

RELAY;  OMIT  00p  IF  KRC  RELAY; 

SUBSl ITUTE  02  FOR  D0c 

& 

D0p  IF  kRQ  RELAY 

AL 
CSG 
CSP 
Ooc 

Oop 

res 
Ia 

los 
MA 

or 

OS 

RRG, RRP 

RRH 

RRT 

TXZ3 

zos 

ZP-U 
ZP-3� 

zs-u 

ZS-3, 

C

S

G 

S2a 

S2TC 
BSCO 

ALARM  UNIT  OF  KA  RELAY 
GROUMO  AUXILIARY 

IIIIIT 

OF  KA  RELAY 

�HASE  AUXILIARY  UNIT  OF  KA  RELAY 

CURRENT  POLARIZEO  OIRECTIOMAL  UNIT  OF  XRO 

RELAY 
VOLTAGE  POLARIZEO  OIRECTIONAL  UNIT  OF  XRO 

RELAY 

INOICATING  CONTACTOR  SWITCH  OF  XO 

& 

XRO 

RELAYS 

GROUNO  OVERCURRENT  TRIP  UNIT  OF  XRO  RELAY 
GROUMO  START  OVERCURRENT  UNIT  OF  KA  RELAY 
MILLIAMMETER 
OPERATION  INOICATOR  OF  KA  RELAY 
AUXILIARY  UNIT  OF  XS  RELAY 
REC£1VER  RELAY  UNIT  CONTACTS  OF  XA  RELAY 

HOLDING  COIL  OF  RECEIVER  RELAY  UNIT  OF  KA 

RELAY 

TRIPPING  COIL  OF  RECEIVER  RELAY  UNIT  OF  KA 

RELAY 
TIMER  START  AUXILIARY  UNIT  OF  T0-2  RELAY 

OISTANCE  UNIT  OF  XS  RELAY 

PHASE-TO-PHASE  UNIT  OF  XO  RELAY 
3  PHASE  UNIT  OF  kO  RELAY 
PHASE-TO-PHASE  UNIT  OF  X0-1  RELAY 
3  PHASE  UNIT  OF  K0-1  RELAY 
CIRCUIT  BREAKER  AUXILIARY  SWITCH  CONTACT-

CLOSEO  WilEN  BREAKER  IS  CLOSEO 
CIRCUIT  BREAKER  TRIP  COIL 
CUTOUT  SWI TCH-1 N  "OM"  POSITION  WilEN 

CHANNEL  IS  OPERATIVE 

Fig. 

2. 

Directional  Comparison  Blocking- Trip 

& 

Control  Circuits. 

www 

. ElectricalPartManuals 

. com 

Summary of Contents for KD

Page 1: ...his system can be utilized with minor differ ences with either on off or frequency shift type of operation over pilot wire tones microwave or power line carrier channels Blocking of tripping is ef fected by either keying on or shifting the transmitter frequency EQUIPMENT COMPLEMENT K Dar is the designation for a group of relays which are itemized below Directional Fault Detecting Relays 1 Type KD ...

Page 2: ... UNIT OF KA RELAY CURRENT POLARIZEO OIRECTIOMAL UNIT OF XRO RELAY VOLTAGE POLARIZEO OIRECTIONAL UNIT OF XRO RELAY INOICATING CONTACTOR SWITCH OF XO XRO RELAYS GROUNO OVERCURRENT TRIP UNIT OF XRO RELAY GROUMO START OVERCURRENT UNIT OF KA RELAY MILLIAMMETER OPERATION INOICATOR OF KA RELAY AUXILIARY UNIT OF XS RELAY REC 1VER RELAY UNIT CONTACTS OF XA RELAY HOLDING COIL OF RECEIVER RELAY UNIT OF KA RE...

Page 3: ...ws an optional time delay backup path through T3 contact which bypasses the RRP contact circuit T3 contact TX Z3 coil are from the TD 2 timing relay which is associ ated with an independent 2 zone distance backup circuit not shown Operation of ZP energizes TX Z3 coil which starts the timer If the fault either internai or external is not cleared by other means the breaker will be tripped after time...

Page 4: ...duces a receiver output at A which energizes the RRH coil to prevent RRP and RRG contacts from closing thus tripping is pre vented Conversely for an ihternal fault tripping units operate at both stations to energize CSP or CSG contacts to prevent transmission of a blocking signal another set of CSP CSG contacts energize t he RRT coil Since neither station receives a blocking signal both RRH coils ...

Page 5: ...OPEN OPEN GROUND Do CSG CSG ENERGIZES CLOSES CLOSES CSG Do CSG CSG ENERG I ZES CLOSES CLOSES CSG RRH COIL C3 R M RCVR FAUI T RRH ENERGIZED RRH DE ENERGIZED NOTE I FAULT RRH DE ENERGIZED RRH DE ENERGIZED FAULT RRH ENERGIZED RRH DENER GIZED FAULT RRH DE ENERGIZED RRH DE ENERGIZED TRIP CIRCUIT zp tOo I Iro R 2a c RRP RRG HELD OPEN BY RRH CURRENT RRP RRG HELD OPEN BY MAGNETIC BIAS NOHI TRIP THROUGH ZP...

Page 6: ...swing describes an arc which intersects the Z circle at point Q and ZP 3 circle at point OS P During an out of step condition the Z0s contact in figure 2 opens before ZP 3 contact closes OS 6 unit is energized and after 4 cycles an OS con tact opens the ZP 3 trip circuit All this occurs before the swing reaches point P in Fig 3 During a fault the ZP 3 contact closes almost at the same instant that...

Page 7: ...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 8: ...WESTINGHOUSE ELECTRIC CORPORATION RELAY DEPARTMENT 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 ...

Page 9: ...line carrier channels Blocking of tripping is ef fected by either keying on or shifting the transmitter frequency These instructions contemplate the use of separate primary and back up relays in line with local back up philosophies Fig 4 shows the details of this arrangement This contrasts to the previous 3 zone system where the zone 2 phase distance units provided carrier tripping as well as back...

Page 10: ...ECTIONAL UNIT OF KRD RELAY ItS IRDICATIRG CONTACTOR SWITCH OF KO KRD RELAYS Io GROUND OVERCURREMT TRIP UIU T OF KRD RELAY los GROUND START OVERCURRENT UNIT OF KA RELAY MA M I LLIA14HETER 01 OPERATION INDICATOR OF KA RELAY OS AUXILIARY UNIT OF KS RELAY RRG RRP RECEIVER RELAY UNIT CONTACTS OF KA RELAY RRH HOLDING COIL OF RECEIVER RELAY URIT OF KA RELAY RRT TRIPPING COIL OF RECEIVER RELAY URIT OF KA ...

Page 11: ...A fig 1 also operate for faults on the adja cent system therefore the ZP contacts must be supervised by a contact which does not close during external faults This supervising contact is RRP in fig 2 For internal faults the RRP contact closes to permit one of the ZP contacts to energize the breaker trip coil 52 TC The trip path is from positive through ICS coil ZP or ZP 3 OS contacts 85 CO contact ...

Page 12: ...oil current holds the RRP and RRG contacts open RRT coil current closes the RRP and RRG contacts in the absence of RRH coil current Tliis is the key point which produces the comparison function the force pro duced by RRH current is stronger than the opposing force produced by RRT current so that the RRP and RRG contacts will be closed by RRT current only when no blocking signal is received In Fig ...

Page 13: ...OSES NOTE 2 CSG los Do CSG CSG BKQ B OPENS ENERGIZES CLOSES CLOSES NOTE 2 CSG RRH COIL J R M RCVR FAULT RRH ENERGIZED RRH DE ENERGIZED HlOTE I FAULT RRH DE ENERGIZED RRH DE ENERGIZED FAULT RRH ENERGIZED RRH DENER Gl ZED FAULT RRH DE ENERGIZED RRH DE ENERGIZED TRIP CIRCUIT zp Do I Ira c 2a c RRP RRG HELD OPEN BY RRH CURRENT RRP RRG HELD OPEN BY MAGNETIC BIAS NOTEI TRIP THROUGH ZP RRP TRIP THROUGH Z...

Page 14: ...00 2000 CCnHACT _3_ _4 S 6 7 8 hf c t r o X DENOTES CONTACT CI O EO I I I I I CJc I I SAME AS ZONE 1 ZONE 2 INTERNAL 5CHE IVIA TICS DEVICE NO DEVICE DWG t JO 43 RECL ON O F iOGoGLE SW DS41 f 9 85 CO C l R ON OFF S oo ITCH 85 P8 DEVICE No C A R TE T P SH BUTTON CAR D C SUPPL Y ON OFF TOUGLE SWITCH KR SLHT DEl UNIT 250VO TRESI TOR UNIT RELAY DS 41 GOO F 14 r C z c 1 C z oc Nc E t c i KD ZONE 2 KD PI...

Page 15: ...15 1 0 t 1 85Z co TIME DISTANCE PLOT 21 Z 21 J rz o j 21 S o r _ _ _ _ _ _ 1 _ _ _ _ _ _ _ I P CARRIER POS DJ t c J L C L II BA CK UPRELAYING 7NT iO i01 Th 1M n 10 2 RT 1X L l l 1 1 2 Th TM lCS _ q 3 ill w II RECLOSINC CIRCUIT Pos t 1 0 IOI SC sl co 79 16 79X T 19 f bb 0 TO CLOSING CKT 7 OR 60LN 52X NEG r 19M l 79Z 791 T 14 s o 791 ill 5 15 Fig 4 Detailed schematic of the K Dar 4 zone directional ...

Page 16: ...ult value ZLoad to the fault value represented by the line 0 F in Fig 3 When a swing or out of step condition occurs the imped ance seen by Z0s ZP changes gradually as the voltage decreases and the current increases In Fig 3 the swing describes an arc which intersects the Z0s circle at point Q and ZP 3 circle at point P During an out of step condition the Z0s contact in figure 2 opens before ZP 3 ...

Page 17: ...power line carrier channels Blocking of tripping is ef fected by either keying on or shifting the transmitter frequency These instructions contemplate the use of separate primary and back up relays in line witli local back up philosophies Fig 4 shows the details of this arrangement This contrasts to the previous 3 zone system where the zone 2 phase distance units provided carrier tripping as well ...

Page 18: ...C 85CO 290Bl54 ALARM UNIT OF KA 4 RELAY GROUND AUXILIARY UNIT OF U 4 RELA Y ASE AUXI LIARY UNIT OF KA 4 RELAY CURRENT POLARIZED 0IRECTI OMAL UN IT OF KRD 4 RELAY VOLTAGE POLARIZED DIRECTIONAL UNIT OF KR0 4 RELAY INDICATING CONTACTOR SWITCH Of KD4 KR0 4 RELAYS GROUND OVERCURREMT TRIP UNIT OF U0 4 RELAY GROUND START OVERCURRENT UNIT OF KA 4 RELAY Ml LLIANMETER OPERATION INDICATOR OF ICA 4RELAY AUXIL...

Page 19: ... 1 also operate for faults on the adja cent system therefore the ZP contacts must be supervised by a contact which does not close during external faults This supervising contact is RRP in fig 2 For internal faults the RRP contact closes to permit one of the ZP contacts to energize the breaker trip coil 5 2 TC The trip path is from positive through ICS coil ZP or ZP 3 OS contacts 85 CO contact 1 2 ...

Page 20: ...ontacts open RRT coil current closes the RRP and RRG contacts in the absence of RRH coil current Tliis is the key point which produces the comparison function the force pro duced by RRH current is stronger than the opposing force produced by RRT current so that the RRP and RRG contacts will be closed by RRT current only when no blocking signal is received In Fig 1 ZP or D0 I0 contacts close at bre...

Page 21: ...TE 2 CSG Do los CSG CSG BKA B OPENS ENERG I ZES CLOSES CLOSES NOTE 21 CSG R R H C O I L c r R M RC I R FAULT RRH ENERGI ZED RRH DE ENERGIZED NOTE I FAULT RRH DE ENERG IZED RRH DE ENERGIZED FAULT RRH ENERGIZED RRH DENER Gl ZED FAULT RRH DE ENERGIZED RRH DE ENERGIZED T R IP C I RCUIT zp I Do I Iro R c 2o c RRP RRG HELD OPEN BY RRH CURRENT RRP RRG HELD OPEN BY MAGNETIC BIAS NOTEI TRIP THROUGH ZP RRP ...

Page 22: ...DEVICE NO 21 1 2 s 6 T 67N 67NT t 67N1 61tH J L 7 84LH sox 5AME A S Z O N E I ZONE Z INTfRNAL I I S C EMATICS OEVte E C i QW OFF 10 5tr S CA ON OF SWITCH CAR TEST 1 If SI IET OFT UN r 250 v J 7 liE SISTO IJlQCIUNG DIODE ON I KO ii ON E 2 Kl PIL O T T R I P 0 4 N MG Ei B R FAIL IWX BKR FAIL AU KRD 4 K R P I R P SGR 12 A M T OX K0 3 CUR T DETE TOR DW5 NO S OifASJS t A s 1 8 4 A I s 62 A S I 1 29 A 7...

Page 23: ...ONN CTION TO lli OCK ONE 2 TRIPPING O U R N G OUT OF ST P CONDITION IF i ONE 2 I S BLOCKED uSE t L7EitNATF CONNFC110N 6 M P gto ZPI VG TMROU5H T 3 CHJ IN5 1Tt t CL0S N6 CIRCUIT POS _ r 0 1101 SC t Z O V 60 C P S sl as 6 co iO IJ 52 6 1 T J l 8 0 CCO S N J C J4 T 7 J 71M Nf6 __ _ __ _ __ _ _ t t7 9 X 3 546701 5 Fig 4 Detailed schematic of the K Dar 4 zone direc tional c omparison blocking system 7 ...

Page 24: ... sud denly from the prefault value Z Load to the fault value represented by the line 0 F in Fig 3 When a swing or out of step condition occurs the imped ance seen by Z 0s ZP changes gradually as the voltage decreases and the current increases In Fig 3 the swing describes an arc which intersects the Z 0s circle at point Q and ZP 3 circle at point P During an out of step condition the Z 0s contact i...

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