Poles discordance protection
Synchro-check and energizing check
Single- and/or three-pole tripping
Secondary system supervision
CT secondary circuit supervision
VT secondary circuit supervision
Redundant A/D sampling data self-check
Phase-sequence of voltage and current supervision
The third harmonic of voltage supervision
Synchro-check reference voltage supervision
Auxiliary contacts of circuit breaker supervision
Logicality of setting self-check