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Definitions (58)
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subtransmission
Subtransmission lines are power lines that typically operate at a voltage of 34,000 to 70,000 volts and are generally below 100 kV.
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voltage collapse
A phenomenon whereby a series of events ultimately results in a blackout after a certain amount of time ranging from seconds to minutes.
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90/10 load
An annual forecast of the state’s peak electric demand (load) where there is a 10-percent chance that the actual system peak load will exceed the forecasted value in any given year or, stated another [..]
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affected utility
Affected utilities are those whose systems cause, contribute to or would experience an impact from a reliability issue.
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angle
Used to measure the synchronism between different alternating quantities, such as voltage or current. It is often an important performance measure; it is measured in degrees.
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baseload
A baseload power plant is an electric generation plant that is expected to operate in most hours of the year.
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blackout
A total loss of power over an area; usually caused by the failure of electrical equipment on the power system.
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breaker-and-a-half
A substation design that offers advantages such as ensuring that the failure of any one circuit breaker will not interrupt power for more than a brief time. The designs also allow parts of the substat [..]
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brownout
Abnormally low voltage that causes voltage-sensitive equipment such as computers, motors and certain types of lighting to have degraded or interrupted performance.
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bus
Also referred to as a “node” or a “station” or a “substation.” A common connection point for two or more electrical components, such as a transformer, a generator.
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