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ERCOT System Operator Certification Questions
with Detailed Verified Answers
There are electrical connections between ERCOT and the Eastern Interconnection.
True or False?
Ans: True, there are two DC ties connecting ERCOT with the Eastern Interconnection.
There are no closed AC ties.
In December, 2009, ERCOT's electrical market was changed from a Zonal to Nodal
model. This means that:
Ans: Transmission system congestion is now managed between thousands of small
points (nodes) in the ERCOT system, rather than between a few large zones.
At a certain bus, current lags voltage by 72. What fraction of a cycle does this 72
phase lag correspond to?
Ans: 1/5th
What is the peak value of the voltage amplitude for a 345 KV AC voltage?
Ans: 345/.707= 244 KV
What is the phase difference between the two vectors in each of the following pairs?
(1) 345<90 and 345<60
(2) 138<-90 and 138<+90
© Get it right 2025 Getaway - Stuvia US All rights reserved
ERCOT System Operator Certification Questions
with Detailed Verified Answers
There are electrical connections between ERCOT and the Eastern Interconnection.
True or False?
Ans: True, there are two DC ties connecting ERCOT with the Eastern Interconnection.
There are no closed AC ties.
In December, 2009, ERCOT's electrical market was changed from a Zonal to Nodal
model. This means that:
Ans: Transmission system congestion is now managed between thousands of small
points (nodes) in the ERCOT system, rather than between a few large zones.
At a certain bus, current lags voltage by 72. What fraction of a cycle does this 72
phase lag correspond to?
Ans: 1/5th
What is the peak value of the voltage amplitude for a 345 KV AC voltage?
Ans: 345/.707= 244 KV
What is the phase difference between the two vectors in each of the following pairs?
(1) 345<90 and 345<60
(2) 138<-90 and 138<+90
© Get it right 2025 Getaway - Stuvia US All rights reserved
