Areva MiCOM P921 - 1. Ratings; 2. Burdens; 3. Protection Setting Ranges

Technical Guide P92x/EN TD/E11
Technical Data
MiCOM P921-P922-P923 Page 1/30
CONTENTS
1. RATINGS 6
1.1 Voltages 6
1.2 Auxiliary voltage 6
1.3 Frequency 6
1.4 Logic inputs 7
1.5 Output Relay Contacts 7
2. BURDENS 8
2.1 Voltage circuits 8
2.2 Auxiliary supply 8
2.3 Optically-isolated inputs 8
3. PROTECTION SETTING RANGES 9
3.1 Undervoltage (ANSI code 27) 9
3.1.1 Threshold settings (secondary values) 9
3.1.2 Time delay settings 9
3.1.3 Inverse Time Delay Characteristic 9
3.1.4 Definite time delay characteristics 11
3.1.5 Hysteresis 11
3.2 Overvoltage (ANSI code 59) 11
3.2.1 Threshold settings (secondary values) 11
3.2.2 Time delay settings 11
3.2.3 Inverse Time Delay Characteristic 12
3.2.4 Definite time delay characteristics 14
3.2.5 Hysteresis 14
3.3 Residual overvoltage / neutral displacement (ANSI code 59N) 15
3.3.1 Threshold settings (secondary values) 15
3.3.2 Time delay settings 15
3.3.3 Inverse Time Delay Characteristic 15
3.3.4 Definite time delay characteristics 16
3.3.5 Hysteresis 16
3.4 Negative sequence overvoltage (ANSI code 47) only P922 & P923 16
3.4.1 Threshold settings (secondary values) 16
3.4.2 Time delay settings 16
3.4.3 Inverse Time Delay Characteristic 17
3.4.4 Definite time delay characteristics 17