General Overview Flashcards
1
Q
1
A
Master element
2
Q
2
A
Time-delay starting or closing relay
3
Q
3
A
Checking or interlocking relay, complete sequence
4
Q
4
A
Master protective
5
Q
5
A
Stopping device, emergency stop switch
6
Q
6
A
Starting circuit breaker
7
Q
7
A
Rate of change relay
8
Q
8
A
Control power disconnecting device
9
Q
9
A
Reversing device
10
Q
10
A
Unit sequence switch
11
Q
11
A
Multifunction device
12
Q
12
A
Overspeed Device
13
Q
13
A
Synchronous-speed device
14
Q
14
A
Underspeed device
15
Q
15
A
Speed or frequency matching device
16
Q
16
A
Data communication device
17
Q
17
A
Shunting or discharge switch
18
Q
18
A
Accelerating or decelerating device
19
Q
19
A
Starting to running transition contactor
20
Q
20
A
Electrically operated valve (solenoid valve)
21
Q
21
A
Distance relay
22
Q
22
A
Equalizer circuit breaker
23
Q
23
A
Temperature control device, heater
24
Q
24
A
Volts per hertz relay
25
25
Synchronizing or synchronism-check device
26
26
Apparatus thermal device, temperature switch
27
27
Undervoltage relay
28
28
Flame detector
29
29
Isolating contactor
30
30
Annunciator relay
31
31
Separate excitation device
32
32
Directional power relay
33
33
Position switch
34
34
Master sequence device
35
35
Brush-operating or slip-ring short circuiting device
36
36
Polarity or polarizing voltage device
37
37
Undercurrent or underpower relay
38
38
Bearing protective device / bearing RTD
39
39
Mechanical condition monitor (vibration)
40
40
Field relay / loss of excitation
41
41
Field circuit breaker
42
42
Running circuit breaker
43
43
Manual transfer or selector device
44
44
Unit sequence or starter relay
45
45
Fire detector
46
46
Reverse-phase or phase balance current relay or stator current unbalance
47
47
Phase-sequence or phase balance voltage relay
48
48
Incomplete sequence relay / blocked rotor
49
49
Machine or transformer thermal relay / thermal overload
50
50
Instantaneous overcurrent relay
51
51
AC time overcurrent relay
52
52
AC circuit breaker
53
53
Exciter or Dc generator relay
54
54
Turning gear engaging device
55
55
Power factor relay
56
56
Field application relay
57
57
Short-circuiting or grounding device
58
58
Rectification failure relay
59
59
Overvoltage relay
60
60
Voltage or current balance relay
61
61
Density switch or sensor
62
62
Time-delay stopping or opening relay
63
63
Pressure switch detector
64
64
Ground protective relay
65
65
Govenor
66
66
Notching or jogging device / maximum starting rate / starts per hour / time between starts
67
67
AC directional overcurrent relay
68
68
Blocking relay / power swing blocking
69
69
Permissive control device
70
70
Rheostat
71
71
Liquid switch
72
72
DC circuit breaker
73
73
Load-resistor contactor
74
74
Alarm relay
75
75
Position changing mechanism
76
76
DC overcurrent relay
77
77
Telemetering device, speed sensor
78
78
Phase angle measuring or out-of-step protective relay
79
79
AC reclosing relay / auto reclose
80
80
Liquid or gas flow relay
81
81
Frequency relay
82
82
DC reclosing relay
83
83
Automatic selective control or transfer relay
84
84
Operative mechanism
85
85
Pilot communications, carrier or pilot-wire relay
86
86
Lock-out relay, master trip relay
87
87
Differential protective relay
88
88
Auxiliary motor or motor generator
89
89
Line switch
90
90
Regulating device
91
91
Voltage directional relay
92
92
Voltage and power directional relay
93
93
Field-changing contactor
94
94
Tripping or trip-free relay
95
96
Transmitter
96
95, 97-99
For specific applications where other numbers are not suitable
