SAMPLE DRAWING

SINGLE LINE DRAWING FDR LARGE DG'SWITH PRIMARY LINE PROTECTION

REQUIRED PROTECTION

DEV2527324650/51V50/51N59678187B87T50/51

FUNCTIONSYNCH CHECKUNDER VOLTAGEDIRECTIONAL POWER

NEG SEQUENCE OCINST & TD OC VOLT RES INST & TD OC GROUNDOVER VOLTAGE DIRECTIONAL DCOVER/UNDER FREQBUS DIFFERENTIALTRANS DIFFERENTIAL

INST. & TIME O.C.

GENERATOR PROTECTIONREQUIREDOVER/UNDER VOLTAGE OVER/UNDER FREQUENCY NEGATIVE SEQUENCE REVERSE POWERVOLTAGE RESTRAINT OVER CURRENT LOSS OF EXCITATION

RECOMMENDED

GROUND PROTECTION DIFFERENTIAL PROTECTION

TWO MICROPROCESSOR RELAYS MAY BE USED. IF UNE MICROPROCESSOR RELAY IS USED, THE RELAY ALARM MUST TRIP THE BREAKER.

SAMPLE DRAWING

SINGLE LINE DRAWING FOR DG'S WITH SECONDARY LINE PROTECTION

REQUIRED PROTECTION

DEV25273256/51V50/51N5967468150/51V87B87T

FUNCTIONSYNCH CHECKUNDER VOLTAGE

DIRECTIONAL POWER INST & TD OC VOLT RES INST & TD OC GROUNDOVER VOLTAGEDIRECTIONAL OCNEG SEQUENCE OC OVER/UNDER FREQ INST & TD OCBUS DIFFERENTIAL TRANS DIFFERENTIAL

a

1

**ISOLATION TRANSFORMER MAY NOT BE REQUIRED IF :A) HARMONIC REQUIRMENTS ARE MET AND TESTED ANDB) NEUTRAL REATORS PROVIDE EFFECTIVELY

GROUNDED SYSTEM ANDc) FAULTS ON THE LIPA SYSTEM CAN BE

SELECTIVELY DETECTED.

TWO MICROPROCCESSOR RELAYS MAY BE USED IF ONE MICROPROCCESSOR RELAY IS USED, THE RELAY ALARM TRIP THE BREAKER.

GENERATOR PROTECTIONREQUIRED

OVER/UNDER VOLTAGE OVER/UNDER FREQUENCY NEGATIVE SEQUENCE REVERSE POWERVOLTAGE RESTRAINT OVER CURRENT LOSS OF EXCITATIONRECOMMENDED

GROUND PROTECTION DIFFERENTIAL PROTECTION