ERCOT SYSTEM OPERATOR CERTIFICATION EXAM WITH CORRECT ACTUAL
QUESTIONS AND CORRECTLY WELL DEFINED ANSWERS LATEST ALREADY
GRADED A+
Study online at https://quizlet.com/_jqjlod
1. There are electrical connections between True, there are two DC ties connecting ERCOT
ERCOT and the Eastern Interconnection. with the Eastern Interconnection. There are
True or False? no closed AC ties.
2. In December, 2009, ERCOT's electrical mar- Transmission system congestion is now
ket was changed from a Zonal to Nodal managed between thousands of small
model. This means that: points (nodes) in the ERCOT system, rather
than between a few large zones.
3. At a certain bus, current lags voltage by 72. 1/5th
What fraction of a cycle does this 72 phase
lag correspond to?
4. What is the peak value of the voltage am- 345/.707= 244 KV
plitude for a 345 KV AC voltage?
5. What is the phase difference between the (1) 30 , (2) 180
two vectors in each of the following pairs?
(1) 345<90 and 345<60
(2) 138<-90 and 138<+90
6. What is the per-unit value of a 345 KV bus 1.04, Yes
voltage, if SCADA shows the actual bus
voltage to be 358.8 KV? If operating criteria
require voltage to be within 5% of the nom-
inal value, is the bus voltage within limits?
7. What is the unit of measurement for elec- Amps / Farad / Henry
tric current? For capacitance? For induc-
tance?
1/3
QUESTIONS AND CORRECTLY WELL DEFINED ANSWERS LATEST ALREADY
GRADED A+
Study online at https://quizlet.com/_jqjlod
1. There are electrical connections between True, there are two DC ties connecting ERCOT
ERCOT and the Eastern Interconnection. with the Eastern Interconnection. There are
True or False? no closed AC ties.
2. In December, 2009, ERCOT's electrical mar- Transmission system congestion is now
ket was changed from a Zonal to Nodal managed between thousands of small
model. This means that: points (nodes) in the ERCOT system, rather
than between a few large zones.
3. At a certain bus, current lags voltage by 72. 1/5th
What fraction of a cycle does this 72 phase
lag correspond to?
4. What is the peak value of the voltage am- 345/.707= 244 KV
plitude for a 345 KV AC voltage?
5. What is the phase difference between the (1) 30 , (2) 180
two vectors in each of the following pairs?
(1) 345<90 and 345<60
(2) 138<-90 and 138<+90
6. What is the per-unit value of a 345 KV bus 1.04, Yes
voltage, if SCADA shows the actual bus
voltage to be 358.8 KV? If operating criteria
require voltage to be within 5% of the nom-
inal value, is the bus voltage within limits?
7. What is the unit of measurement for elec- Amps / Farad / Henry
tric current? For capacitance? For induc-
tance?
1/3
