IEEE Device No. Protection Function
2 Time-delay relay
12 Overspeed
13 Synchronous speed check or centrifugal switch
14 Underspeed device
21 Impedance relay
23, 23Q Temperature-control device, Oil temperature monitor
24 V/Hz over fluxing relay
26, 26W Apparatus overheating device, Winding temperature monitor
27 Undervoltage — instantaneous or inverse
32 Directional power relay
38 Bearing temperature monitor
39 Vibration monitor
40 Loss of field protection
41 Field contactor or circuit breaker
46 Phase-balance or negative-sequence relay
47 Phase-sequence undervoltage
48 Incomplete-sequence relay
49 Thermal relay operated by current or winding temperature
50, 50G Instantaneous OC relay phase, Instantaneous OC relay, ground
51, 51G Time OC relay, phase, Time OC relay, ground
51N Residual connected TOC
52 Power circuit breaker
53 Excitation check relay for synchronous motors
55 Power factor relay
56 Field application relay
59, 59GN Overvoltage relay, Stator ground relay (HR)
60 Voltage balance relay
63 Liquid or gas pressure relay
64 Ground-fault detection from machine to ground
71 Liquid or gas level relay
78 Out-of-step relay
81 Frequency relay
86 Lockout relay
87, 87N Differential-protection relay, phase, Differential- protection relay, ground
94 Tripping or trip-free relay
No comments:
Post a Comment