Switchgear System

 

This is my first article in English. I will try to use my English because as Enginner, English is mandatory. But, the one of important is all of you can understand what I mean. So, in this part i want to share about ansi code protection to configurate of relay because in power system, we often find some identification for relay setting.

21 : Distance relay
25 : Synchronizing device
26 : RTD
27 : Under Voltage
32 : Directional Power
40 : Loss off field
47 : Phase sequence relay
48 : Incomplete sequence relay
49 : Thermal Overload
49T : Temperature Monitoring
50 : Instantaneous Overcurrent



50N : Instantaneous Earth Fault Overcurrent
51 : Time-Delayed Overcurrent
51N : Time-Delayed Earth Fault Overcurrent
55 : Power factor relay
59 : Over voltage realy
60 : Voltage Balance relay
64 : Ground Detector Relay
67 : Directional Overcurrent Relay
74 : Trip Circuit Supervision
78 : Phase angle out of step realy
79 : Automatic reclose realy
81 : Frequency relay
81U : Under Frequency
81O : Over Frequency
85 : Pilot wire receiver
86 : Lock out relay
87 : Differential protection relay
87G : Generator differential
91 : Voltage directional relay
92 : Power directional relay
94 : Tripping relay