Recorded data
The relay has the capacity to store the records of the 128 latest
fault events. The records can be used to analyze the power
system events. Each record includes, for example, current,
residual voltage and angle values, start times of the protection
blocks and a time stamp. The fault recording can be triggered
by the start or the trip signal of a protection block, or by both.
The available measurement modes include DFT, RMS and
peak-to-peak. Fault records store relay measurement values at
the moment when any protection function starts. In addition,
the maximum demand current with time stamp is separately
recorded. The records are stored in the nonvolatile memory.
Trip circuit supervision
The trip circuit supervision continuously monitors the availability
and operation of the trip circuit. It provides two open-circuit
monitoring functions that can be used to monitor the circuit
breaker’s control signal circuits. It also detects loss of circuit
breaker control voltage.
Self-supervision
The relay’s built-in self-supervision system continuously
monitors the state of the relay hardware and the operation of
the relay software. Any fault or malfunction detected is used for
alerting the operator.
A permanent relay fault blocks the protection functions to
prevent incorrect operation.
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