Appendix B - Settings and Signals
ORDINAL SIGNAL NAME ELEMENT NAME
DESCRIPTION
“VTS I> Inhibit “ setting has been exceeded in Phase A
“VTS I> Inhibit “ setting has been exceeded in Phase B
“VTS I> Inhibit “ setting has been exceeded in Phase C
Va has exceed 30 volts (drop off at 10 volts)
Vb has exceed 30 volts (drop off at 10 volts)
Vc has exceed 30 volts (drop off at 10 volts)
“VTS I2> Inhibit “ setting has been exceeded
DDB_VTS_DELTA_IA_OPERATED
Superimposed Phase A current has exceed 0.1In
DDB_VTS_DELTA_IB_OPERATED
Superimposed Phase B current has exceed 0.1In
DDB_VTS_DELTA_IC_OPERATED
Superimposed Phase C current has exceed 0.1In
CB Condition Monitoring Pre-Lockout condition
DDB_FREQ_ABOVE_RANGE_LIMIT
DDB_FREQ_BELOW_RANGE_LIMIT
DDB_TELEPROTECTION_DISTURBED
This is an output signal available in the PSL, that could be mapped to “C Diff Failure” for IEC870-5-103
This applies only if distance primary FUN is selected (in IEC870-5-103)
This signal is ON if DDB 1376 is ON and one of the overcurrent stages set to be enabled on VTS condition trips
This is an output signal available in the PSL, which can be mapped in IEC870-5-103 to a minor defect which does not shut down the main
protection
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