51-60 Definitions Flashcards

1
Q

AC Overcurrent Relay

A

Functions when the current in an AC circuit exceeds a given value.

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2
Q

AC Circuit Breaker or Contactor

A

One whose principal function is usually to interrupt, short-circuit or fault currents

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3
Q

Exciter of Generator Relay

A

One which forces the building up of the DC machine field during starting and/or functions when the machine voltage has built up to a given value.

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4
Q

High Speed Circuit Breaker

A

A circuit breaker that starts to reduce the current in the main circuit after the occurrence of DC overvoltage, or an excessive rate of current rise

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5
Q

Power Factor Relay

A

Operates on a given power factor in an AC circuit.

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6
Q

Field Application Relay or Device

A

Used to control automatically the application of AC motor field excitation at some predetermined point in the slip cycle

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7
Q

AC Overvoltage Relay

A

Functions on a given value of AC overvoltage

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8
Q

Voltage Balance Relay

A

Operates on a difference in voltage between two circuits

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