P92x/EN CM/E11 Techncal Guide
Commissioning Guide
Page 2/28 MiCOM P921-P922-P923
abcd
5. SETTING CHECKS 15
5.1 Applying the settings to the relay 15
5.2 Checking the relay settings 15
5.3 Testing the "Phase overvoltage protection" and "Phase undervoltage
protection" functions 16
5.3.1 Wiring diagram 16
5.3.2 MiCOM P921-P922-P923 relay parameters 17
5.3.3 Configuration with 3 single voltages (“3Vpn”) and “AND” detection logic 18
5.3.3.1 Stages (V>) or (V<) with definite time delay 18
5.3.3.2 Stages (V>) or (V<) with inverse time delay 19
5.3.4 Configuration with 3 single voltages (“3Vpn”) and “OR” detection logic 19
5.4 "Under/overfrequency" function tests 20
5.4.1 Wiring diagram 20
5.4.2 MiCOM P922-P923 relay parameters 20
5.4.3 Test example: stage (f1>) or (f1<) 20
5.5 "Rate of change of frequency" function tests 21
5.5.1 Wiring diagram 21
5.5.2 MiCOM P923 relay parameters 21
5.5.3 Test example : stage df/dt1 & df/dt2 22
6. ON-LOAD CHECKS - VOLTAGE INPUT CONNECTIONS 23
7. FINAL CHECKS 24
8. PREVENTATIVE MAINTENANCE 25
8.1 Maintenance period 25
8.2 Maintenance checks 25
8.2.1 Alarms 25
8.2.2 Opto-isolated inputs 25
8.2.3 Output relays 25
8.2.4 Measurement accuracy 26
8.3 Method of repair 26
8.3.1 Replacing the complete relay 26
8.4 Changing the battery 27
8.4.1 Instructions for replacing the battery 27
8.4.2 Post modification tests 27
8.4.3 Battery disposal 27
8.5 Cleaning 27
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