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PROTECTIVE RELAYING SJFD > TEST QUESTIONS > Flashcards

TEST QUESTIONS Flashcards

1
Q

SOO 600.12 IDENTIFIES WHICH 3 FAULTS

A

(64) GROUND FAULTS, (87) DIFFERENTIAL RELAY ACTIONS, AND (63) SUDDEN PRESSURE RELAY ACTIONS

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2
Q

PER OP-18 THE DEVICE SETTING LIST SHOULD CONTAIN WHAT INFO?

A

IDENTIFY THE DEVICE, SETTING HISTORY, INSTALL DATE, MANUFACTURER/MODEL, AND LAST CALIBRATION/TEST DATE.

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3
Q

WHERE CAN YOU FIND INFO ABOUT A RELAY?

A

THE DEVICE SETTING LIST, OP MANUALS, & PRINTS

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4
Q

WHAT ARE THE 3 MAJOR FAULTS THAT EFFECT POWER SYSTEMS?

A

LINE TO LINE TO LINE
LINE TO LINE
SINGLE LINE TO GROUND

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5
Q

WHICH FAULT IS THE MOST COMMON?

A

SINGLE LINE TO GROUND

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6
Q

WHAT DOES PRIMARY RELAY MEAN?

A

FIRST LINE OF DEFENSE/PROTECTION AGAINST ELECTRICAL OR MECHANICAL TROUBLE

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7
Q

WHAT DOES BACKUP RELAY MEAN?

A

ONLY FUNCTIONS WHEN PRIMARY RELAYING FAILS

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8
Q

WHAT IS AN AUXILIARY RELAY?

A

ONE THAT OPERATES IN RESPONSE TO THE OPENING OR CLOSING OF ITS OPERATING CIRCUIT AND TO ASSIST ANOTHER RELAY OR DEVICE.

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9
Q

WHAT IS A VERIFICATION RELAY?

A

IT VERIFIES THE POWER SYSTEM CONDITION WITH RESPECT TO PRESCRIBED LIMITS AND TO INITIATE/PERMIT AUTOMATIC FUNCTIONS OTHER THAN OPENING A CIRCUIT BREAKER DURING FAULT CONDITIONS.

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10
Q

WHY IS THERE DIODES ON AN 86 LOCK OUT CIRCUIT?

A

TO PREVENT ELECTRICAL BACK-FEED

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11
Q

DO PROTECTIVE ZONES OVERLAP?

A

YES TO AVOID LEAVING UNPROTECTED AREAS.

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12
Q

WHAT ARE THE 4 BASIC OPERATING PRINCIPLES?

A

ELECTROMAGNETIC ATTRACTION
ELECTROMAGNETIC INDUCTION
THERMAL INDUCTION
ELECTRONIC

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13
Q

HOW CAN THE TIME DELAY ON A RELAY BE ADJUSTED?

A

BY CHANGING THE DISTANCE THE MOVING CONTACT MUST TRAVEL.

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14
Q

WHAT IS INVERSE TIME?

A

OPERATING TIME BECOMES LESS AS THE MAGNITUDE OF THE ACTUATING QUANTITY IS INCREASED.

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15
Q

WHAT IS AN IDENTIFIER OF A CURRENT SENSITIVE ELECTROMAGNET?

A

HEAVY COPPER WIRE WITH FEW TURNS.

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16
Q

WHAT IS AN IDENTIFIER OF A VOLTAGE SENSITIVE ELECTROMAGNET?

A

FINE COPPER WIRE WITH MANY TURNS.

17
Q

WHAT IS (ICS) AND WHAT IS IT’S FUNCTION?

A

IT IS THE INDICATING CONTACTOR SWITCH AND IT’S CONTACTS OFFER A LOW RESISTANCE CURRENT PATH FOR THE DC TRIP CURRENT AND PROVIDE A SEAL-IN FUNCTION UNTIL THE BREAKER CLEARS. THE ICS IS CONNECTED IN PARALLEL ACTING AS A SHUNT REMOVING THE HEAVY TRIP CURRENT FROM THE SPIRAL SPRING

18
Q

WHAT DOES S.O.E. MEAN AND WHERE CAN YOU FIND THE INFORMATION?

A

SEQUENCE OF EVENTS AND THEY CAN BE FOUND ON SCADA/PSS WONDERWARE.

19
Q

WHAT IS RTD AND WHERE WOULD ONE BE FOUND?

A

RESISTANCE TEMPERATURE DEVICE AND IN A CRITICAL TEMPERATURE AREA OF AN APPARATUS.

20
Q

WHAT RELAY IS USED FOR INTERNAL FAULTS OF A TRANSFORMER?

A

THE 87 DIFFERENTIAL PROTECTIVE RELAY.

21
Q

WHAT CAUSES A 63 (PRESSURE SWITCH)

A

INTERNAL TRANSFORMER FAULT THAT CAUSE SUDDEN PRESSURE CHANGES.

22
Q

IS IMPEDANCE MEASURED AT A FAULT OR AT THE (21) DISTANCE RELAY?

A

AT THE RELAY.

23
Q

WHAT ARE THE CHARACTERISTICS OF A FAULT?

A

INCREASED CURRENT TOWARD THE FAULT
REDUCED VOLTAGE TOWARD THE VAULT
FAULT POWER FLOWS TOWARD THE FAULT
TEMPERATURES RISE IN ELECTRIAL EQUIPMENT

24
Q

WHAT IS THE GENERAL PHILOSOPHY OF RELAY APPLICATION?

A

TO DIVIDE THE POWER SYSTEM INTO PROTECTIVE ZONES WHICH CAN BE ADEQUATELY PROTECTED WITH THE MINIMUM AMOUNT OF THE SYSTEM BEING DISCONNECTED.

25
Q

WHICH CONTACT IS NORMALLY OPEN?

A

THE “A” CONTACT

26
Q

WHICH CONTACT IS NORMALLY CLOSED?

A

THE “B” CONTACT

27
Q

HOW FAST ARE HIGH SPEED RELAYS?

A

3 CYCLES OR LESS.

28
Q

EXPLAIN A (59N) NEUTRAL OVER VOLTAGE FAULT AND DRAW THE CIRCUIT?

A

CURRENT IN THE NEUTRAL OF A DISTRIBUTION TRANSFORMER PRODUCES A VOLTAGE IN THE SECONDARY WHICH OPERATES THE RELAY IF THE VOLTAGE EXCEEDS THE PRE-DETERMINED LEVEL.

29
Q

WHAT IS THE DIFFERENCE BETWEEN THE 51 AND 51V?

A

THE 51V WILL NOT TRIP ON START-UP BECAUSE THERE IS A VOLTAGE RESTRAINT. HOWEVER WHEN THERE IS AN OVER CURRENT CONDITION THE VOLTAGE WILL DROP OUT CLOSING THE RELAY.

30
Q

WHAT IS THE SENSING DEVICE FOR THE OVER-TEMPERATURE OF THE ARMORTISSEUR WINDINGS?

A

THE CT

31
Q

WHAT ARE 2 REASONS FOR HAVING A (40) FIELD RELAY ON A GENERATOR?

A

SYSTEM INSTABILITY PROTECTION
HEATING OF THE ROTOR PROTECTION

32
Q

WHEN DOES THE (64) GROUND FAULT OPERATE?

A

IF ANY PART OF THE FIELD/ROTOR BECOMES GROUNDED, COMPLETING THE CIRCUIT.

33
Q

HOW CAN YOU KNOW IF A PRINT IS RIGHT?

A

BY PHYSICALLY CHECKING IT AGAINST THE SPECIFIC CIRCUIT.

34
Q

WHY IS THE (63) PRESSURE SWITCH USED?

A

IT PROVIDES A MORE SENSITIVE PROTECTION THAN THE 87

PROTECTIVE RELAYING SJFD (2 decks)

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