1
Q
21
A
Distance Relay
2
Q
25
A
Synchronizing or Synchronism-check Device
3
Q
27
A
Undervoltage Relay
4
Q
32
A
Directional Power Relay
5
Q
43
A
Manual Transfer or Selector Device
6
Q
46
A
Reverse-phase or Phase-balance current Relay
7
Q
50
A
Instantaneous Overcurrent Relay
8
Q
51
A
AC Time overcurrent relay
9
Q
52
A
AC Circuit breaker
10
Q
59
A
Overvoltage relay
11
Q
62
A
Time-delay Stopping or Opening Relay
12
Q
63
A
Pressure Switch
13
Q
64
A
Ground Detector Relay
14
Q
67
A
AC Directional Overcurrent Relay
15
Q
74
A
Alarm Relay
16
Q
79
A
AC Reclosing Relay
17
Q
85
A
Carrier or Pilot-wire Receiver Relay
18
Q
86
A
Lockout Relay
19
Q
87
A
Differential Protective Relay
20
Q
94
A
Tripping or Trip-Free Relay
Substation
flashcards
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