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NERC Reliability Test Bank (2024 / 2025) Questions with Verified Answers, 100% Guarantee Pass Score
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NERC Reliability Test Bank (2024 / 2025) Questions with Verified Answers, 100% Guarantee Pass Score

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  • October 9, 2024
  • 111
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • nerc reliability test bank

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  • NERC
  • NERC

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NERC Reliability Test Bank.pdf file:///C:/Users/HP/Desktop/New%20fl/NERC%20Reliability%20T




NERC Reliability Test Bank

Questions & Answers



1. A Balancing Authority has a sudden loss of a large block of load in its area.This loss will

be seen instantaneously in the change of which of the followingvalues?

1. Actual Net Interchange

2. Scheduled Frequency

3. Scheduled Net Interchange

4. Area Control Error


1&4

3&4

1&3

4 only

Answer 1 & 4.









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Due to the loss of load in the area, the BA will have excess generation and the excesswill be exported

into the Interconnection through the tie lines. This will cause the NIa to increase. Scheduled

Frequency and Interchange only change when changed byan operator.



2. A Balancing Authority has twenty units on governor control.The units havedifferent

capacities that range from 200 MW to 1000 MW and droop settings from 2% to 5%.The

biggest adjustments in megawatt output in response to afrequency disturbance will be

provided by units that have .



small capacity and small droop setting large

capacity and small droop setting large

capacity and large droop setting

small capacity and large droop setting

Answer large capacity and small droop setting



When a generator synchronizes to the Interconnection, it couples itself to hundredsof other

machines rotating at the same electrical speed. All generators should havea droop feature added

to their governor.This will allow the generators to respond tothe frequency deviation in





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proportion to their size whenever there is a disturbance or load-resource mismatch. What

controls a generator's response is the governor "droop setting." The smaller the droop the

closer a generator gets to being an isochronous generator. A 4 % droop gives more generator

response to frequency variations than a 5% droop. - NERC training document "Understand and

CalculateFrequency Response", Section; Droop. Page 5



3. In your Interconnection, a generator tripped that was large enough to reduce the

frequency from 60.00 Hz to 59.94 Hz.Your Balancing Authority's Frequency Bias is -200

MW/0.1 Hz. How many MW would your system initially contribute


to frequency support?


200 MW

120 MW

100 MW

80 MW

Answer 120 MW.



BAL-003, Each Balancing Authority shall achieve an annual Frequency Response Measure






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(FRM) (Attachment A) that is equal to or more negative than its FrequencyResponse Obligation

(FRO) to ensure that sufficient Frequency Response is pro- vided by each BA or Frequency

Response Sharing Group (FRSG). For Example

Frequency Bias (which is always a negative number) is measured in MW per tenthHz

(MW/0.1Hz) means if scheduled frequency is 60.00 Hz and actual frequency drops to 59.90 Hz,

a Balancing Authority with a 200 MW/0.1 Hz Frequency Bias would contribute 200 MW to help

arrest the frequency decline.The frequency portionof the ACE equation is -[10*B*(Fa - Fs)]. If

Frequency drops to 59.94 Hz then - (10

* -200 MW/0.1 Hz) * (59.94 Hz - 60.00 Hz) = -(- 2000 MW/Hz * -0.060 Hz) = -120

MW. To return ACE to zero, your Balancing Authority would have to over generate by 120 MW.

This should happen with the response of your generator governors andloads due to the declining

frequency.



4. Governor droop is used to




Restore Frequency to normal

Represent energy lost due to inefficiencies in generationArrest





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