POC BES Flashcards
WHAT IS THE REGIONAL ENTITY?
WECC
HOW MANY AREAS DOES WECC COVER?
5
XFRMR’S OPERATE ON WHAT PRINCIPLE?
ELECTROMAGNETIC INDUCTION
OHMS LAW
E=IXR
HOW TO DEFINE POWER FACTOR
RATIO OF REAL POWER TO APPARENT POWER
WHICH PART OF A GENERATOR IS STATIONARY?
STATOR
DEFINE EFFICIENCY
THE MEASURE OF HOW OUTPUT IS RECEIVED FOR A GIVEN AMOUNT OF INPUT
HEAT RATE MEASUREMENT?
BTU’S
UNIT CAPABILITY
MAX.- SAFE GENERATION PRODUCTION
MIN.-SMALLEST AMOUNT OF GENERATION THAT A UNIT CAN SUSTAIN
RESPONSE RATE IS MEASURED IN WHAT?
MW/MIN.
HOW TO CLASSIFY A SUBSTATION?
THEY HAVE XFRMR’S
WHAT IS THE DIFFERENCE BETWEEN REACTOR AND CAPACITORS
REACTORS- SINK VARS
CAPACITORS-SOURCE VARS
FAULT RECORDERS DO WHAT?
LOG ON PAPER OR COMPUTER CRITICAL CURRENT AND VOLTAGE WAVEFORMS AT THE TIME OF ANY FAULT
WHICH SIDE OF A XFMR IS THE PRIMARY?
THE WINDINGS ELECTRICALLY CONNECTED TO THE POWER SOURCE
HOW TO FIND TURNS RATIO?
V1/V2=N1/N2
(CROSS MULTIPLY)
STEP UP XFMR REFERS TO?
VOLTAGE
CAN A XFMR PRODUCE POWER?
NO
XFMR POWER LOSSES?
HYSTERESIS, EDDY CURRENTS, I2R (HEAT)
WHICH XFMR HAS PHASE SHIFT?
DELTA-WYE
WYE-DELTA
WHICH XFMR DOESNT HAVE PHASE SHIFT?
WYE-WYE
DELTA-DELTA
WHAT DEFINES A POWER XFMR?
VOLTAGES HIGHER THAN 69kV
WHAT IS A AUTO XFMR?
A SINGLE WINDING XFMR WITH A TERMINAL THAT DIVIDES THE WINDINGS IN TWO
WHAT IS A PHASE SHIFTING XFMR?
CONTROL POWER FLOW OVER PARALLEL LINES BY ADJUSTING VOLTAGE PHASE ANGLE AT ONE END OF THE LINE
WHAT IS A INSTRUMENT XFMR?
CT’S LOWERS CURRENT OR PT’S LOWER VOLTAGE FOR RELAY CONTROL CIRCUITRY
WHICH CHARACTERISTICS DESCRIBE BES REQUIREMENTS?
100kV AND ABOVE
GENERATION LARGER THAN 20MVA OR GENERATION AGGREGATE CAPACITY GREATER THAN 75MVA
DOES ALUMINUM OR COPPER HAVE LOWER RESISTANCE
COPPER
WHAT IS CHARGING CURRENT?
CURRENT THAT FLOWS DUE TO THE ALTERNATE CHARGE AND DISCHARGE OF THE LINE DUE TO ALTERNATING VOLTAGE REGARDLESS OF WHETHER THE CIRCUIT IS CLOSED OR OPEN-ENDED
DURING LIGHT LOAD WHERE IS VOLTAGE HIGHER?
AT THE RECEIVING END
SERIES CAPACITORS DUE WHAT?
DECREASE IMPEDANCE AND INDUCTIVE REACTANCE
INCREASE POWER
LIST 4 SOURCES OF REACTIVE POWER
OVER EXCITED GENERATOR AN SYNCHRONOUS CONDENSORS
SHUNT CAPACITORS
LINE CAPACITANCE
IS A BIRD ON A LINE A COMMON FAULT?
NO
ARE INTERNAL FAULTS INSIDE?
YES
DISTANCE RELAY
ONLY ANSWER WITH DISTANCE IN THE CHOICE
LIST 3 TRIPS FOR PILOT SCHEMES
TRANSFER TRIPPING,
DIRECTIONAL COMPARISON,
PHASE COMPARISON
3 THINGS PROTECTED BY DIFFERENTIAL PROTECTION
GENERATORS, XFMRS,BUS SECTIONS
WHAT DIFFERENTIAL ARE CT’S LOOKING FOR?
CURRENT
RAS
ALL OF THE ABOVE
OVERGENERATING DOES WHAT TO FREQ.?
RAISES IT
WHAT ARE UNSCHEDULED FLOWS
LOOP, PARALLEL, AND INADVERTENT FLOWS
WHAT DOES AGC DO?
-AUTO ADJUSTS GENERATION
-COMPUTER CONTROL TO MAINTAIN LOAD/GEN BALANCE
-USES AN ERROR SIGNAL CALL AREA CONTROL ERROR TO FUNCTION
MODES OF AGC?
TIE LINE BIAS CONTROL,
FLAT FREQ. CONTROL,
FLAT TIE LINE CONTROL
