Device Numbers 81-99 Flashcards
81
Frequency device - one which functions on a given value of frequency either under, over ,or normal
82
DC reclosing relay-One which controls the closing and reclosing of a DC circuit interrupter
83
Selective control, or transfer, contactor or relay-One which operates to select automatically between certain sources or conditions in an equipment, or performs automatically a transfer operation
84
Operating mechanism-The complete electrical mechanism, including the operating motor, position switches, etc.
85
Carrier or pilot wire receiver relay-One which is operated or restrained by blocking the signal used in connection with the carrier current or DC wire fault directional relaying
86
Locking out relay or device-an electrically operated hand or electrically reset relay or device which functions to shut down and hold an equipment out of service on the occurrence of abnormal conditions
87
Differential current relay-a fault detecting relay which functions on a differential current of a given percentage of amount
88
Auxiliary motor or motor generator-One used for operating auxiliary equipment such as palms, blowers, exciters, etc.
89
Line switch-used as a disconnecting or isolating switch in an AC or DC power circuit
90
Regulating device-functions to regulate a quantity such as voltage, current, power, etc., at a certain value or between certain limits
91
DC voltage directional relay-operates when the DC voltage across an open circuit breaker or Contactor exceeds a given value in a given direction
92
DC voltage and current directional relay-Operates like device 91, and operates in the opposite manner when the current in the circuit, after the circuit breaker or contactor is closed, exceeds a given value in the opposite direction
93
Field changing contactor or relay-Functions to change the value of excitation on a machine
94
Tripping or trip free relay or Contactor-Functions to trip a circuit breaker, contactor, or equipment or to prevent immediate reclosure of a circuit interrupter, in case it open on overload even though the original closing circuit is maintained
95
Solid-state closing relay or contactor-solid state protective device with capabilities to trip or cause the tripping of associated equipment under various fault conditions for which it is programmed
