NERC TEST QUESTIONS Flashcards
A transmssion operator must maintain adequate reactive power resources to
protect voltage levels under contingency conditons
A sudden enexpected change in weather conditions occurs, Which of the following pieces of data would be most vauluable in anticipating the impact of this weather change on load magnitude?
similar weather data from the previous year
The transmission media in a power line carrier PLC telecommunications system is
a power transmission line
BA “a” sells 100MW to adjacent BA “b”. The ramp is 10 minutes symmetrical accross the hour. The schedule begins at 1300 ends at 1400, How much energy is actually transferred in the period from 1255 to 1405?
100 mwh
A system has experienced a blackout from a major storm that has moved through a large portion of the interconnection. All are true except
ok..
if a generator is supplying reactive power the generator is operating in a condition called
over excited
Maintenace personnel are working in your control center when their actions cause a computer system failure. In the event that your BA’s AGC system fails you would
assume manual control of the generation control process.
All BA’S and TO’s must participate in
the interregional security network (ISN)
An RE has requirements that each of its member systems shed 10% of their load at 59.3hz, 10% at 59.0 hz, and 10%at 58.7 hz. If a member system has 10, 000MW of load and the frequency declines to 59.8 hz, how many MW of load would the member system shed?
0 MW
When closing a circuit breaker between two systems (or islands) thru a synchcheck relay, the circuit breaker will close when?
the two systems are within the relay settings
a mid-week, non holiday time period from 2100 to 200 is an ___hour in TRE.
on peak
A power line carrier (PLC) telecommunication system uses what element as the carrier of the communication signal?
three phase conductors
following the operation of a system’s automatic underfrequency load shedding plan, if overfrequency is likely, the amount of load shedding should be reduced or ___should be provided.
automatic overfrequency load restoration
If a 345 to 115kv transformer has 1000 amps and 500MW flowing into its hi side, what is the current and MW flowing out of the low side?
3000 amps and 500 MW
Who routes tag information
Interchange Authority
Who ensures planning reserves
resource planning
Who monitors IROLS
reliabilty coordinator
Who secures energy
load serving entity
Who Administers Tarriff
transmission service provider
Who coordinates activities of TP’s and RP’s
planning coordinator
each transmission owner shall report all vegetation related outages on transmission circuits of __or higher.
200kv
A larger power plant has a small generator tht is continually run and used to provide power for the plant’s auxiliary loads- What type of generator is this called?
Station service generator
BA “A’ had a 100MW schedule to BA “B’. Balancing Authority B had a 50MW schedule to BA ‘C’. Actural interchange from A to B was 115MhH and from B to C was 45MWh. What is the net inadvertent accumalation for Balance Authority B?
20 MWh into B
What type of automatic load shedding scheme would be most appropriate as a response to a voltage collapse threat?
under voltage based scheme
A transmission line is operating with a voltage phase angle difference of thirty degrees between the sending and the receiving ends of the line. If the receiving -end load is suddenly increased, the voltage phase angle difference will
increase
a 5% reduction in voltage typically leads to a 3-4% reduction in MW load magnitude. If voltage reduction for load relief is done it is:
should be typically done on the distribution system
during the afternoon hours of the day, how many seconds of positive time error will normally initte a time error correction in the TRE Interconnection?
3
Each TOP and BA must provide a written job description to the system operators. This job description must state all of the following except:
system operating responsiblities, system authority, identify personnel subject to the system operator authourity. (no-System operator minimum training requirements
A thermal generator has an emergency power souce. Which two tiems below would typically be powered from this emergency power source?
turning gear & lube oil pumps. (not boiler feed pump or condesor pump).
if the phase angel at an open circuit breaker is equal to 1/4 of a cycel, this is the same as an agle of
90 degrees
To ensure a generator’s reactive reserve is available to respond to systems volatge deviations, the generators voltage regulator should be placed in what mode of operation
automatic
Distrubances or unusual occurrences, suspected or determined to be caused by sabotage shall be reported to
the appropriate systems, governmental agencies and reulatory bodies.
a power system experiences the trip of a key transmission line. Additional tripping of transmission lines rapidly follows. this condition is know as?
cascading
A PSE’s Tag correction:
a change to an existing tag that does not affect the reliability impact of the transaction.
which of the following text based communication systems is used by RC in each major Interconnections?
RCIS
In a transmission synchronizing situation, an ideal situation for the field opertator to report would be a slowly rotating synchroscope needle.
true or false - true is the answer
studies have indicated that for a voltage reduction of 5% non motor load magnitude will on average dcrease by what percentage
7%
A balance authority has a bias of -150MW. Frequency falls 0.05HZ due to an external disturbance. How many MW would you expect this BA to provide to the disturbance?
plus 75
A non certified system operator can work in an independent position while they are:
moving to a back-up control center
At 1105 a unit trips offline outside your BA area, The frequency dips to 59.91. Your BA ace was zero for the hour. Assuming no metering error or time corrections, what could be said about the inadvertent for your AB area for HE 1200?
Inadvertent accumalation leaving your area
Which winding of a BES transformer are shunt reactors normally connected to
Tertiary
Inadvertent energy accounting adjustments shall be made at least once each ___to correct for differences between hourly MWh meter totals derived from register readings at the tie-line meters.
month
when energizing transmission lines during power system reconstruction, which of the following factors do you most need to consider?
natural capacitance
The sceduled interchange component of a BA’s AGC is adjusted during which phase of the Interchange Transaction process?
Implementing (not-assesing, arranging, or confirmaing).
Which type of special operating procedure is implemented to relieve an overloaded transmission path?
transmission line loading relief (TLR) procedure
If two systems are severly out of synch (large frequency difference) a field operator is likely to report the following:
a vibrating indicating needle
The purpose of a series capicators is best desbribed by which of the following?
decrease the impedance and boosts power transfer capability
If a BA cannot comply ith the CPS and or DCS and they have exhausted all other available options, which step is taken next?
Shed firm load
Assume a circuit breaker is about to be closed during a system restoratiion. If possible the phase rotation should be stopped and the phase angle reduced to __degrees or less before the reconnection is made.
10 degrees
all of the following types of data are used in steady state power flow simulation except
load forecast data, transmission line impedances, and generation unit committment. (not-weather forecast data)
Assume you are in an RTO and a PSE terminates and Interchange Transaction that is in progress. The PSE notifies the Sink Balancing Authority that it submitted the tag to. The sink Balancing Authority must contact:
The Source Balance Authority and Their Balance Coordinator
The role of the Interchange Authority in the 4 step interchange process (Arrange, Asses, Confirm, Implement) is best describe by which word?
Distribute (not - evualate, initate, or analyze)
