Functions
2.10 Monitoring Functions
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
170
2.10.1.9 Information List
2.10.2 Trip Circuit Supervision 74TC
The 7SK80 is equipped with an integrated trip circuit supervision. Depending on the number of available binary
inputs (not connected to a common potential), supervision with one or two binary inputs can be selected. If the
allocation of the required binary inputs does not match the selected supervision type, a message to this effect
is generated („74TC ProgFail“).
Applications
• When using two binary inputs, malfunctions in the trip circuit can be detected under all circuit breaker con-
ditions.
• When only one binary input is used, malfunctions in the circuit breaker itself cannot be detected.
Prerequisites
A requirement for the use of trip circuit supervision is that the control voltage for the circuit breaker is at least
twice the voltage drop across the binary input (V
ct
> 2 · V
BImin
).
Since at least 19 V are needed for the binary input, the monitor can only be used with a system control voltage
of over 38 V.
No. Information Type of In-
formation
Comments
161 Fail I Superv. OUT Failure: General Current Supervision
162 Failure Σ I OUT Failure: Current Summation
163 Fail I balance OUT Failure: Current Balance
167 Fail V balance OUT Failure: Voltage Balance
169 VT FuseFail>10s OUT VT Fuse Failure (alarm >10s)
170 VT FuseFail OUT VT Fuse Failure (alarm instantaneous)
171 Fail Ph. Seq. OUT Failure: Phase Sequence
175 Fail Ph. Seq. I OUT Failure: Phase Sequence Current
176 Fail Ph. Seq. V OUT Failure: Phase Sequence Voltage
197 MeasSup OFF OUT Measurement Supervision is switched OFF
253 VT brk. wire OUT Failure VT circuit: broken wire
255 Fail VT circuit OUT Failure VT circuit
256 VT b.w. 1 pole OUT Failure VT circuit: 1 pole broken wire
257 VT b.w. 2 pole OUT Failure VT circuit: 2 pole broken wire
258 VT b.w. 3 pole OUT Failure VT circuit: 3 pole broken wire
6509 >FAIL:FEEDER VT SP >Failure: Feeder VT
6510 >FAIL: BUS VT SP >Failure: Busbar VT
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