51-60 Definitions Flashcards
AC Overcurrent Relay
Functions when the current in an AC circuit exceeds a given value.
AC Circuit Breaker or Contactor
One whose principal function is usually to interrupt, short-circuit or fault currents
Exciter of Generator Relay
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.
High Speed Circuit Breaker
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
Power Factor Relay
Operates on a given power factor in an AC circuit.
Field Application Relay or Device
Used to control automatically the application of AC motor field excitation at some predetermined point in the slip cycle
AC Overvoltage Relay
Functions on a given value of AC overvoltage
Voltage Balance Relay
Operates on a difference in voltage between two circuits