sample drawing - pacific gas and electric company · sample dra \jing single line dra ... sample...
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SAMPLE DRAWING
SINGLE LINE DRAWING FOR LARGE DG'S WITH PRIMARY LINE PROTECTION
PGI.£ SYSTEM
PG&.E SWITCH t PG&.E SIDE
PRODUCER'S DG FACILITY
¥""'"RULE 21 DISCQNllECT DEVICE
REQUIRED PROTECTION PULSES.J TD RTN
DEV 25 27 32 46 50/51V 50/51N 59 67 81
FUNCTION SYNCH CHECK UNDER VOLT AGE DIRECTIONAL PO\IER NEG SEQUENCE DC INST &. TD DC VOLT RES INST &. TD DC GROUND OVER VOLT AGE DIRECTIONAL DC
TD PG&.E
BREAKER
87T RTU SUPV JNTERITE Bl<R TRIP
87B 87T 50/51
OVER/UNDER FREQ BUS DIFFERENTIAL TRANS DIFFERENTIAL
INST. &. TIME O.C. 1 NEUTRAL •
3~-REACTOR ,l ~~~~~ +- GENERATOR BREAKER STATUS PGLE-+ ALARMS
GENERATOR PROTECTION REQUIRED OVER/UNDER VOLTAGE OVER/UNDER FREQUENCY NEGATIVE SEQUENCE REVERSE PO'WER VOLTAGE RESTRAINT OVER CURRENT LOSS OF EXCITATION RECOMMENDED GROUND PROTECTION DIFFERENTIAL PROTECTION
T'WO MICROPROCESSOR RELAYS MAY BE USED. IF ONE MICROPROCESSOR RELAY IS USED, THE RELAY ALARM MUST TRIP THE BREAKER.
u1141,
6. ,, )
) SYNCH ) SYNCH
HIGH IMPEDANCE GROUNDED GENERATORS 'WITH GENERATOR PROTECTIVE RELAYING
TELEMETERING
i )
TD LOADS
SAMPLE DRA \JING
SINGLE LINE DRA \JING FDR DG'S \v'ITH SECONDARY LINE PROTECTION
t PGl.E SYSTEM
PGl.E SWITCH PGl.E SIDE ~~~ ~~~~~
BILLING METERING PRODUCER'S DG FACILITY
PRIMARY METERING CUBICLE LIPA CS 8735
REQUIRED PROTECTION
DEV 25 27
FUNCTION SYNCH CHECK
RULE 21 DISCONNECT SWITCH .........
CUSTOMER OWNED TRANSFORMER <MAXIMUM 150KVA>
32 50/51V 50/51N 59 67 46
UNDER VOLT AGE DIRECTIONAL PO\JER INST 8. TD DC VOLT RES INST 8. TD DC GROUND OVER VOLT AGE DIRECTIONAL DC NEG SEQUENCE DC OVER/UNDER FREQ
•TTTT~
b$~t INST 8. TD DC 81 50/51V 87B 87T
BUS DIFFERENTIAL TRANS DIFFERENTIAL INTERCONNECTION )
BREAKER
GENERATOR PROTECTION REQUIRED OVER/UNDER VOLTAGE OVER/UNDER FREQUENCY NEGATIVE SEQUENCE REVERSE POW'ER VOLTAGE RESTRAINT OVER CURRENT LOSS OF EXCITATION RECOMMENDED GROUND PROTECTION DIFFERENTIAL PROTECTION
T\JO MICROPROCCESSOR RELAYS MAY BE USED IF ONE MICROPROCCESSOR RELAY IS USED, THE RELAY ALARM TRIP THE BREAKER.
nISOLA TION TRANSFORMER MAY NOT BE REQUIRED IFi A) HARMONIC REQUIRMENTS ARE MET AND TESTED AND B) NEUTRAL REATORS PROVIDE EFFECTIVELY
GROUNDED SYSTEM AND C) FAULTS ON THE LIPA SYSTEM CAN BE
SELECTIVELY DETECTED.
) SYNCH
TD PGa.E
ONLY I
__ _J
ISOLATION TRANSFORMER ••
) SYNCH
r--_, __ . NEUTRAL REACTOR llOIE
I
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