Device Numbers 81-99 Flashcards Preview

Hydropower > Device Numbers 81-99 > Flashcards

Flashcards in Device Numbers 81-99 Deck (19)
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1
Q

81

A

Frequency device - one which functions on a given value of frequency either under, over ,or normal

2
Q

82

A

DC reclosing relay-One which controls the closing and reclosing of a DC circuit interrupter

3
Q

83

A

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

4
Q

84

A

Operating mechanism-The complete electrical mechanism, including the operating motor, position switches, etc.

5
Q

85

A

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

6
Q

86

A

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

7
Q

87

A

Differential current relay-a fault detecting relay which functions on a differential current of a given percentage of amount

8
Q

88

A

Auxiliary motor or motor generator-One used for operating auxiliary equipment such as palms, blowers, exciters, etc.

9
Q

89

A

Line switch-used as a disconnecting or isolating switch in an AC or DC power circuit

10
Q

90

A

Regulating device-functions to regulate a quantity such as voltage, current, power, etc., at a certain value or between certain limits

11
Q

91

A

DC voltage directional relay-operates when the DC voltage across an open circuit breaker or Contactor exceeds a given value in a given direction

12
Q

92

A

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

13
Q

93

A

Field changing contactor or relay-Functions to change the value of excitation on a machine

14
Q

94

A

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

15
Q

95

A

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

16
Q

96

A

Reserved for special application

17
Q

97

A

Reserved for special Application

18
Q

98

A

Reserved for special application

19
Q

99

A

Reserved for special application

Decks in Hydropower Class (81):