P92x/EN TD/E11 Technical Guide
Technical Data
Page 2/30 MiCOM P921-P922-P923
3.4.5 Hysteresis 17
3.5 Positive sequence undervoltage (ANSI code 27D) only P922 & P923 17
3.5.1 Threshold settings (secondary values) 17
3.5.2 Time delay settings 18
3.5.3 Inverse Time Delay Characteristic 18
3.5.4 Definite time delay characteristics 18
3.5.5 Hysteresis 18
3.6 Under/overfrequency (ANSI codes 81U/81O) only P922 & P923 19
3.7 Rate of change of frequency (ANSI codes 81R) only P923 19
3.7.1 Threshold settings 19
3.7.2 Integration time 19
3.7.3 Validation number of protection 19
3.7.4 Under voltage blocking 20
4. MEASUREMENT AND RECORDS 21
4.1 Settings 21
4.2 Disturbance record (P922 and P923) 21
4.3 Frequency disturbance record (P923 only) 21
5. COMMUNICATIONS 22
5.1 Front port (RS232) 22
5.2 Rear port (RS485) 22
6. CONTROL FUNCTIONS SETTINGS 23
6.1 Circuit breaker state monitoring 23
6.2 Circuit breaker control 23
6.3 Circuit Breaker Condition Monitoring 23
7. LOGIC EQUATIONS 23
8. VT RATIOS 23
9. ACCURACY 24
9.1 Reference conditions 24
9.2 Measurements accuracy 24
9.3 Protection Accuracy 24
9.4 High Voltage Withstand IEC60255-5:1977 25
9.4.1 Dielectric Withstand 25
9.4.2 Impulse 25
9.4.3 Insulation Resistance 25
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