81-99 Flashcards
82
dc reclosing relay
controls the closing and reclosing of a d-c circuit interrupter, generally in response to load circuit conditions
81
Frequency Device
functions on a given value of frequency– either under, over, or normal
83
selective control or transfer, contactor or relay
operates to select automatically between sources or conditions in an equipment or performs automatically a transfer operation
84
Operating Mechanism
the complete electrical mechanism, including the operator motor, position switches ect… for tap changes, induction regulator or similar apparatus
85
Carrier or Pilot Wire Reciever Relay
is operated or restrained by a blocking signal used in connection with carrier current or d-c pilot 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 or amount
88
auxiliary motor or motor generator
used for operating auxiliary equipment such as pumps, blowers, exciters, ect..
89
Line Switch
used as a disconnecting or isolating switch in an a-c or d-c power circuit
90
regulating device
functions to regulate a quantity such as voltage, current, power, ect… at a certain value or between certain limits
91
D-C Voltage directional relay
Operates when the d-c voltage across an open circuit breaker or contactor exceeds a given value in a given direction
92
D-C Voltage and current directional relay
operates in one manner when the d-c voltage across an open circuit breaker or contactor exceeds a given value in a given direction, and operates in the oppisite 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 opens on overload, even though the original closing circuit is maintained
95-99
Reserved for special applications
