61-70 Flashcards
62
time delay stopping or opening relay
Serves in conjunction with the device which initiates the shutdown, or stopping, or opening,
In an automatic sequence.
61
current balance relay
Operates on difference in current input or output of two circuits
63
fluid pressure, level, or flow relay
Operates on a given value of fluid or gas pressure, or flow, or fluid level
64
ground protective relay
Functions on failure of the insulation of a machine , transformer, or other apparatus to ground, or on flashover of a dc machines to ground. This function is, however not applied for the residual or secondary neutral circuit of current transformers
65
governor
Is the equipment which controls the gate or valve opening of a prime mover
66
notching relay
Functions to allow only a specified number of operations of a given device or equipment, or a specified number of successive operations within a given time of each other
67
a-c power directional or a-c power directional over current relay
Functions on a desired value of power flow or on a desired value of overcurrent with ac power flow, in a given direction
68
dc thermal relay or device
Functions when the temperature of the dc machine exceeds a given value
69
permissive control device
Is generally a two position, manually operated switch which permits the closing of a circuit breaker, or the placing of an equipment into operation in one position and in the other position prevents operating the circuit breaker or the equipment
70
Electrically operated rheostat
Used to vary the resistance of a circuit in response to some means of electrical control
