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Westinghouse KD Скачать руководство пользователя страница 17

INSTALL A Tl 0 N

Westinghouse

I.L. 41-911C

•

OPERATION

•

MAINTENANCE

INSTRUCTIONS

K-DAR DIRECTIONAL COMPARISON

BLOCKING SYSTEMS

IN TRODU CTION

This leaflet describes the overall functioning

of K-Dar relays when used in conjunction with a

blocking channel (power line carrier, microwave or
pilot wire).

Detailed description of operation,

as well as setting and maintenance recommendations
for individual relays of the K-Dar directional com

parison  blocking system are  covered  in  the  individual
relay  instruction  leaflets;  the  description  here  is
intended  to  supplement  these  relay  instructions.

APPLI CATION

Directional comparison blocking is employed to

elimirntte  delayed  clearing  of  end-zone  line  faults;
thus,  high  speed,  simultaneous  clearing  of  all  line
faults  is  accomplished.  Protective  relays  energized
with  current  and  potential  from  the  protected  line
are  unable  to  trip  both  selectively  and  at  high  speed
for  line  faults  near the  remote station.  By transmitting
a  signal  from  the  remote  station  when  the  fault  is

external to the protected line, the local relays are

blocked from tripping.

Without this additional

means  of  intelligence,  local  relay  tripping  must  be
delayed  for  internal  faults  near  the  remote  station,
to  insure  against  undesired  tripping  when  t he  fault
is  on  an  adjacent  circuit  near  the  remote  station.

This 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.

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 arran gement. This contrasts to the previous

3-zone system where the zone

2

phase-distance units

provided carrier tripping as well as back-up. Never-

SUPERSEDES I.L.

41-911

B

*Denotes change from superseded issue.

the less, the underlying principles described here
apply whether or not the back-up protection is inde

pendent or common with the primary protection. Of
course, the relaying complement will vary.

EQUIPMEN T COMPLEMEN T

K-Dar is the designation for a group of relays,

which are itemized below:

Directional Fault Detecting Relays

1 - Type KD4 Directional phase tripping unit,

consisting of:

1 -Phase-to-phase

unit (ZP-¢</:>), which

operates for all three combinations of

phase-to-phase faults anywhere on the
protected line.

1 - Three-phase unit (ZP-3 ¢),which operates

for 3 phase faults anywhere on the pro
tected line.

1

-Indicating contactor switch (ICS).

1- Type KD41 Directional Phase � unit,

consisting of:

1

-

Phase-to-phase unit

(Z&¢</:>),

set to

reach in t he reversed direction to that
of ZP-¢4.

1 - Three phase unit (Z&3 ¢), set to reach

in the reversed direction to that of ZP-3¢.

1 - Indicating contactor switch (ICS).

1 -Type KRD (or KRC, or KRP, or KRQ) Di

rectional ground tripping unit, consisting of:

1 - Directional unit, current polarized (D0c)

1 - Directional unit, voltage polarized (D0p)

1 -Instantaneous overcurrent unit (10)

1

-

Indicating contactor switch (ICS)

EFFECTIVE NOVEMBER

1968

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Содержание KD

Страница 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 ...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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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