Exam (elaborations)
NERC SOS Vocabulary Questions with Correct Answers 2024
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Exam of 7 pages for the course SOS NERC at SOS NERC (NERC SOS Vocabulary)
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NERC SOS VocabularyLoad-Tap Changer (LTC) - answer A device on transformers to allow the changing of
the primary windings to except different primary voltages. It regulates the output voltage
to required levels. This is normally achieved by changing the ratios of the transformers
on the system by altering the number of turns in one winding of the appropriate
transformer(s).
Modified Interchange - answer Refers to an Interchange that has to be changed from
the original Confirmed Interchange due to circumstances - usually directed by a
Reliability Coordinator for current or imminent reliability-related reasons. The
modification may be a curtailment or reduction in the megawatt profile, or it may be an
increase in the profile where a schedule is countering the reliability problem.
MVAR, Reactive Power - answer The portion of electricity that establishes and sustains
the electric and magnetic fields of alternating-current equipment. Reactive power must
be supplied to most types of magnetic equipment, such as motors and transformers. It
also must supply the reactive losses on transmission facilities.
N-1 Contingency Planning - answer(The "Normal" [N] state minus the next contingency
= N - 1) planning the system to be reliable for the unexpected failure or outage of any
single system component.
NERCNet - answerA Wide Area Network using Frame Relay as its communications
medium. It supports the Interregional Security Network, Interchange Distribution
Calculator and the Reliability Coordinator Information System.
NERCNet Security Policy - answerThe document that establishes responsibilities and
minimum requirements for the protection of information assets, computer systems and
facilities of NERC and other users of NERCNet. This policy is contained in Attachment 1
to Standard COM-001.
NERCNet User Organizations - answerThose organizations that have received
authorization from NERC to access the NERC network and use it for exchanging
information. They are responsible for maintaining security and for ensuring proper use
of NERCNet at their connection.
Network Resource - answerAny designated generating resource owned, purchased, or
leased by a network customer under the provisions of an Open Access Transmission
Tariff.
, Backup Relays - answerRelays that protect the same electrical equipment that the
primary relays protect. They operate after a time delay and would generally affect more
of the power system.
Bilateral - answerAffecting two parties, involving two groups, symmetry. Bilateral
Interchange is at least two Balancing Authorities that agree to move power generation
from on party to another.
Capacitance - answerThe property of an electrical circuit developed when two
conductors are separated by a dielectric.
Capacitor - answerA circuit element that stores energy in the form of an electrical
charge and introduces capacitance into a circuit. The stored energy creates an electric
field.
Control Performance Standard 1 (CPS1) - answerA frequency-sensitive evaluation of
how well a Balancing Authority's demand requirements were met. A CPS1 score of
200% is perfect (actual measured frequency equals scheduled frequency over any 1-
minute period). The minimum passing long-term (12-month rolling average) score for
CPS1 is 100%. CPS1 is a 12-month rolling average that recognizes that certain
intervals will not have ideal performance and certain seasons may not be as well
managed.
Current Transformers - answerInstrument transformers designed for transforming large
current magnitudes to secondary current suitable for relaying and metering. The
secondary current flow is proportional to the larger primary current flow.
Cycle - answerOne full sine wave cycle that is divided into 360 degrees. The wave form
passes through zero, rises to a maximum, drops back to zero, drops to a minimum, then
rises again to zero. Both current and voltage in North America power systems have
cycle wave forms that will repeat 60 times a second.
Data link - answerThe means of connecting one location to another for the purpose of
transmitting and receiving information.
Voltage Regulator - answerA device that is designed to automatically maintain a
constant voltage level output.
Wave Trap - answerA filter used to remove the power line carrier signal from the line
and route it to the line protective relays.
Zones of Protection - answerThe zones are areas within which a protective relay can
sense abnormal conditions
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