Device Numbers 81-99 Flashcards Preview

Hydropower > Device Numbers 81-99 > Flashcards

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

81

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

2

82

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

3

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

4

84

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

5

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

6

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

7

87

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

8

88

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

9

89

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

10

90

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

11

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

12

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

13

93

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

14

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

15

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

16

96

Reserved for special application

17

97

Reserved for special Application

18

98

Reserved for special application

19

99

Reserved for special application

Decks in Hydropower Class (81):