Trip Circuit Supervision 74Tc; Functional Description - Siemens SIPROTEC 4 Manual

Overcurrent time protection
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Functions
2.11 Monitoring Functions
No.
Information
175
Fail Ph. Seq. I
176
Fail Ph. Seq. V
197
MeasSup OFF
253
VT brk. wire
255
Fail VT circuit
256
VT b.w. 1 pole
257
VT b.w. 2 pole
258
VT b.w. 3 pole
6509
>FAIL:FEEDER VT
6510
>FAIL: BUS VT

Trip Circuit Supervision 74TC

2.11.2
Devices 7SJ80 are 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, then a
message to this effect is generated (
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
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.
2.11.2.1

Functional Description

Supervision with Two Binary Inputs
When using two binary inputs, these are connected according to
contact on one side, and parallel to the circuit breaker auxiliary contacts on the other.
166
Type of
Comments
Informa-
tion
OUT
Failure: Phase Sequence Current
OUT
Failure: Phase Sequence Voltage
OUT
Measurement Supervision is switched OFF
OUT
Failure VT circuit: broken wire
OUT
Failure VT circuit
OUT
Failure VT circuit: 1 pole broken wire
OUT
Failure VT circuit: 2 pole broken wire
OUT
Failure VT circuit: 3 pole broken wire
SP
>Failure: Feeder VT
SP
>Failure: Busbar VT
74TC ProgFail ).
> 2 · V
).
Ct
BImin
Figure
2-62, parallel to the associated trip
SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017

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