NERC RC (NP3 Transmission) Exam test preparation Questions and Must have marking scheme Updated version 2023/2024
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NERC
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NERC
NERC RC (NP3 Transmission) Exam test preparation Questions and Must have marking scheme Updated version 2023/2024
Q32643 Which of the following is an action a Transmission Operator would perform in Real-time when reactive resources are expected to be limited ? -correct answer Ensure that suff...
NERC RC (NP3 Transmission) Exam test
preparation Questions and Must have
marking scheme Updated version 2023/2024
Q32643 Which of the following is an action a Transmission
Operator would perform in Real-time when reactive resources
are expected to be limited ? -correct answer Ensure that
sufficient dynamic and static MVAR sources are available.
FB: Based on its assessment of the system, each Transmission
Operator shall have evidence of scheduling sufficient reactive
resources with its area to protect the voltage levels under normal
and contingency conditions. Transmission Operators can provide
sufficient reactive resources through various means including,
but not limited to, reactive generation scheduling, transmission
line and reactive resources switching, and using controllable
load.
Q32648 MVAR production can be increased or decreased by
which of the following: -correct answer By placing a high
voltage transmission line in service or taking one out of service.
FB: Transmission lines can be a source of reactive power or a
sink of reactive power. MVAR production can be increased or
decreased by placing a high voltage transmission line in service
or taking one out of service. This is an acceptable method of
controlling voltage on the transmission system but should only be
used when engineering studies indicate taking the line out of
service will not have a negative impact on reliability.
,Q32644 The voltage on the power system is increasing due to an
unexpected drop in customer load. Which of the following
devices would a Transmission Operator bring on-line to get the
voltage level back into a normal range? -correct answer
Reactors
FB: Most generators have the capability to absorb reactive
power by under-exciting the generator rotor. Static VAR
compensators are also able to absorb excessive reactive power
using its reactors as needed in just a few cycles. However,
generators with their AVR in service and static VAR
compensators are dynamic resources and should already be in
service. If voltage is spiking due to an unexpected drop in
customer load, reactors, which are typically located at high
voltage stations, can be brought into service as needed.
Q32638 Which of the following statements are true ? -correct
answer •)When a line loaded below its SIL, voltage increase,
and inductive reactive resources will reduce the voltage.
•) When a line loaded above, its SIL, voltage decrease, and
capacitive reactive resources will increase voltage.
FB: A transmission line loaded above its SIL (Surge Impedance
Loading) decreases voltage, while a transmission line loaded
below its SIL increases the voltage. Capacitive reactive
resources, such as capacitor banks, are designed to add MVARs
to increase voltage. Inductive reactive resources, suck as
reactors, are designed to absorb MVAR's from the system to
decrease voltage.
, Q32645 The voltage on the power system is starting to drop due
to the normal load pick-up during the morning hours. As a
Transmission Operator, where should you increase the reactive
power on the transmission and distribution systems? -correct
answer As close to the heaviest inductive load areas as
possible.
FB: The closer you can place reactive power sources to the
inductive load, the less current you will have on the transmission
system thus fewer MW and MVAR losses.
Q32635 What is the purpose of a voltage schedule? -correct
answer Ensure the transmission system has adequate reactive
support for power transfer with minimum losses during periods
of both high and low demand.
FB: A voltage or Reactive Power schedule, which is either a
range or target value with an associated tolerance band,
specifies the time frames of high and low system demand and
dictates the voltage each unit must maintain in order to support
system demand. The schedule ensures the transmission system
has adequate reactive support for power transfer with minimum
losses during periods of both high and low demand.
Q32641 It is the responsibility of the Transmission Operator to
acquire sufficient ____________ within its area to protect the
voltage levels under normal and contingency conditions. -correct
answer Reactive Resources
FB: Based on its assessment of the system, each Transmission
Operator shall have evidence of scheduling sufficient reactive
resources within its area to protect the voltage levels under
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