74Tc Trip Circuit Supervision; Functional Description - Siemens SIPROTEC 4 7SD80 Manual

Functions
2.14 Monitoring Functions
No. Information
196 Fuse Fail M.OFF
197 MeasSup OFF
289 Failure Σi
290 Broken Iwire L1
291 Broken Iwire L2
292 Broken Iwire L3
295 Broken wire OFF
296 Σi superv. OFF
297 ext.Brk.Wire ØA
298 ext.Brk.Wire ØB
299 ext.Brk.Wire ØC
3270 >RESET BW
3271 Broken Iwire a
3272 Broken Iwire b
3273 Broken Iwire c
2.14.2

74TC Trip Circuit Supervision

The 7SD80 line protection is equipped with an integrated trip circuit supervision function. 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 routing of the binary inputs required for this does not comply with the selected
monitoring mode, an alarm is given ("TripC1 ProgFAIL ...", with identification of the non-compliant circuit).
When using two binary inputs, malfunctions in the trip circuit can be detected under all circuit-breaker condi-
tions. When only one binary input is used, malfunctions in the circuit breaker itself cannot be detected. If
singlepole tripping is possible, a separate trip circuit supervision can be implemented for each circuit-breaker
pole provided the required binary inputs are available.
2.14.2.1

Functional Description

Monitoring 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.
A precondition for the use of the trip circuit supervision is that the control voltage for the circuit breaker is
higher than the total of the minimum voltages drops at the two binary inputs (V
V are needed at each binary input, the supervision can only be used with a system control voltage higher than
38 V.
162
Type of Comments
Informa-
tion
OUT Fuse Fail Monitor is switched OFF
OUT Measurement Supervision is switched OFF
OUT Alarm: Current summation supervision
OUT Alarm: Broken current-wire detected L1
OUT Alarm: Broken current-wire detected L2
OUT Alarm: Broken current-wire detected L3
OUT Broken wire supervision is switched OFF
OUT Current summation superv is switched OFF
OUT Broken current-wire at other end ØA
OUT Broken current-wire at other end ØB
OUT Broken current-wire at other end ØC
SP >RESET broken wire monitoring
IntSP Alarm: Broken current-wire detected A
IntSP Alarm: Broken current-wire detected B
IntSP Alarm: Broken current-wire detected C
Figure 2-73, parallel to the associated trip
> 2·V
Ctrl BImin
SIPROTEC 4, 7SD80, Manual
E50417-G1100-C474-A2, Edition 02.2018
). Since at least 19