The numerical synchro-check relay type SPAU 140 C is a voltage measuring relay designed to be used when two power systems are to be connected together.
The synchro-check relay SPAU 140 C can be used for both synchro-check functions and voltage-check functions. The synchro-check function is used when two separate networks or two electrically interconnected network sections are to be connected together. The voltage-check function is used when a disconnected bus/line is to be connected to an energized section of a network. The synchro-check function allows circuit breaker closing only if the voltages on both sides of the circuit breaker fulfill the preset conditions as to magnitude, phase and frequency difference.
Two identical operation stages allowing the closing conditions of two separate circuit breakers to be checked
Synchro-check function available for both operation stages
Voltage-check function available for both operation stages
Two different operation modes: continuous
Continuous auto-diagnostic self-supervision of both relay hardware and software