TEST QUESTIONS Flashcards
SOO 600.12 IDENTIFIES WHICH 3 FAULTS
(64) GROUND FAULTS, (87) DIFFERENTIAL RELAY ACTIONS, AND (63) SUDDEN PRESSURE RELAY ACTIONS
PER OP-18 THE DEVICE SETTING LIST SHOULD CONTAIN WHAT INFO?
IDENTIFY THE DEVICE, SETTING HISTORY, INSTALL DATE, MANUFACTURER/MODEL, AND LAST CALIBRATION/TEST DATE.
WHERE CAN YOU FIND INFO ABOUT A RELAY?
THE DEVICE SETTING LIST, OP MANUALS, & PRINTS
WHAT ARE THE 3 MAJOR FAULTS THAT EFFECT POWER SYSTEMS?
LINE TO LINE TO LINE
LINE TO LINE
SINGLE LINE TO GROUND
WHICH FAULT IS THE MOST COMMON?
SINGLE LINE TO GROUND
WHAT DOES PRIMARY RELAY MEAN?
FIRST LINE OF DEFENSE/PROTECTION AGAINST ELECTRICAL OR MECHANICAL TROUBLE
WHAT DOES BACKUP RELAY MEAN?
ONLY FUNCTIONS WHEN PRIMARY RELAYING FAILS
WHAT IS AN AUXILIARY RELAY?
ONE THAT OPERATES IN RESPONSE TO THE OPENING OR CLOSING OF ITS OPERATING CIRCUIT AND TO ASSIST ANOTHER RELAY OR DEVICE.
WHAT IS A VERIFICATION RELAY?
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.
WHY IS THERE DIODES ON AN 86 LOCK OUT CIRCUIT?
TO PREVENT ELECTRICAL BACK-FEED
DO PROTECTIVE ZONES OVERLAP?
YES TO AVOID LEAVING UNPROTECTED AREAS.
WHAT ARE THE 4 BASIC OPERATING PRINCIPLES?
ELECTROMAGNETIC ATTRACTION
ELECTROMAGNETIC INDUCTION
THERMAL INDUCTION
ELECTRONIC
HOW CAN THE TIME DELAY ON A RELAY BE ADJUSTED?
BY CHANGING THE DISTANCE THE MOVING CONTACT MUST TRAVEL.
WHAT IS INVERSE TIME?
OPERATING TIME BECOMES LESS AS THE MAGNITUDE OF THE ACTUATING QUANTITY IS INCREASED.
WHAT IS AN IDENTIFIER OF A CURRENT SENSITIVE ELECTROMAGNET?
HEAVY COPPER WIRE WITH FEW TURNS.
WHAT IS AN IDENTIFIER OF A VOLTAGE SENSITIVE ELECTROMAGNET?
FINE COPPER WIRE WITH MANY TURNS.
WHAT IS (ICS) AND WHAT IS IT’S FUNCTION?
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
WHAT DOES S.O.E. MEAN AND WHERE CAN YOU FIND THE INFORMATION?
SEQUENCE OF EVENTS AND THEY CAN BE FOUND ON SCADA/PSS WONDERWARE.
WHAT IS RTD AND WHERE WOULD ONE BE FOUND?
RESISTANCE TEMPERATURE DEVICE AND IN A CRITICAL TEMPERATURE AREA OF AN APPARATUS.
WHAT RELAY IS USED FOR INTERNAL FAULTS OF A TRANSFORMER?
THE 87 DIFFERENTIAL PROTECTIVE RELAY.
WHAT CAUSES A 63 (PRESSURE SWITCH)
INTERNAL TRANSFORMER FAULT THAT CAUSE SUDDEN PRESSURE CHANGES.
IS IMPEDANCE MEASURED AT A FAULT OR AT THE (21) DISTANCE RELAY?
AT THE RELAY.
WHAT ARE THE CHARACTERISTICS OF A FAULT?
INCREASED CURRENT TOWARD THE FAULT
REDUCED VOLTAGE TOWARD THE VAULT
FAULT POWER FLOWS TOWARD THE FAULT
TEMPERATURES RISE IN ELECTRIAL EQUIPMENT
WHAT IS THE GENERAL PHILOSOPHY OF RELAY APPLICATION?
TO DIVIDE THE POWER SYSTEM INTO PROTECTIVE ZONES WHICH CAN BE ADEQUATELY PROTECTED WITH THE MINIMUM AMOUNT OF THE SYSTEM BEING DISCONNECTED.
WHICH CONTACT IS NORMALLY OPEN?
THE “A” CONTACT
WHICH CONTACT IS NORMALLY CLOSED?
THE “B” CONTACT
HOW FAST ARE HIGH SPEED RELAYS?
3 CYCLES OR LESS.
EXPLAIN A (59N) NEUTRAL OVER VOLTAGE FAULT AND DRAW THE CIRCUIT?
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.
WHAT IS THE DIFFERENCE BETWEEN THE 51 AND 51V?
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.
WHAT IS THE SENSING DEVICE FOR THE OVER-TEMPERATURE OF THE ARMORTISSEUR WINDINGS?
THE CT
WHAT ARE 2 REASONS FOR HAVING A (40) FIELD RELAY ON A GENERATOR?
SYSTEM INSTABILITY PROTECTION
HEATING OF THE ROTOR PROTECTION
WHEN DOES THE (64) GROUND FAULT OPERATE?
IF ANY PART OF THE FIELD/ROTOR BECOMES GROUNDED, COMPLETING THE CIRCUIT.
HOW CAN YOU KNOW IF A PRINT IS RIGHT?
BY PHYSICALLY CHECKING IT AGAINST THE SPECIFIC CIRCUIT.
WHY IS THE (63) PRESSURE SWITCH USED?
IT PROVIDES A MORE SENSITIVE PROTECTION THAN THE 87
