DuyMinh Software

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Các loại bảo vệ trong hệ thống điện - PROTECTIVE RELAYING

DEVICE NUMBERS AND THEIR UNIVERSAL NOMENCLATURE

2 Time delay relay
3 Interlocking relay
21 Distance relay
25 Check synchronizing relay
27 Undervoltage relay
30 Annunciator relay
32 Directional power (Reverse power) relay
37 Low forward power relay
40 Field failure (loss of excitation) relay
46 Negative phase sequence relay
49 Machine or Transformer Thermal relay
50 Instantaneous Overcurrent relay
51 A.C IDMT overcurrent relay
52 Circuit breaker
52a Circuit breaker Auxiliary switch “Normally open� (‘a’ contact)
52b Circuit breaker Auxiliary switch “Normally closed� (‘b’ contact)
55 Power Factor relay
56 Field Application relay
59 Overvoltage relay
60 Voltage or current balance relay
64 Earth fault relay
67 Directional relay
68 Locking relay
74 Alarm relay
76 D.C Overcurrent relay
78 Phase angle measuring or out of step relay
79 AC Auto reclose relay
81 Frequency relay
81U Underfrequency relay
81O Overfrequency relay
83 Automatic selective control or transfer relay
85 Carrier or pilot wire receive relay
86 Tripping Relay
87 Differential relay
87G Generator differential relay
87GT Overall differential relay
87U UAT differential relay
87NT Restricted earth fault relay (provided on HV side of Generator transformer)
95 Trip circuit supervision relay
99 Overflux relay
186A Auto reclose lockout relay
186B Auto reclose lockout relay

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