No. Information Type of
Informa-
tion
Comments
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
Trip Circuit Supervision 74TC
Devices 7SJ62/64 are equipped with an integrated trip circuit supervision. Depending on the number of avail-
able 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, then 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
conditions.
•
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 supervision can only be used with a system control
voltage of over 38 V.
Description
Supervision with Two Binary Inputs
When using two binary inputs, these are connected according to Figure 2-76, parallel to the associated trip
contact on one side, and parallel to the circuit breaker auxiliary contacts on the other.
2.12.2
2.12.2.1
Functions
2.12 Monitoring Functions
SIPROTEC 4, 7SJ62/64, Manual 193
C53000-G1140-C207-8, Edition 08.2016
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