Check Of The Signal Transmission For Breaker Failure Protection And/Or End Fault Protection; Testing User-Defined Functions; Trip And Close Test With The Circuit Breaker - Siemens SIPROTEC 4 7VK61 Manual

Mounting and Commissioning
3.3 Commissioning
Set the calculated time under address 239 als T-CB close (under P.System Data 1). Select the next
lower settable value.
NOTE
i
i
The operating time of the accelerated output relays for command tripping is taken into consideration by
the device itself. The trip command is to be allocated to such a relay. If this is not the case, then add 3 ms
to the measured circuit breaker operating time for achieving a greater response time of the "normal" output
relay.
[messung-der-ls-eigenzeit-260602-kn, 1, en_GB]
Figure 3-26
Check of the Signal Transmission for Breaker Failure Protection and/or End
3.3.11
Fault Protection
If the transfer trip command for breaker failure protection or stub fault protection is to be transmitted to the
remote end, this transmission must also be checked.
To check the transmission the breaker failure protection function is initiated by a test current (secondary) with
the circuit breaker in the open position. Make sure that the correct circuit breaker reaction takes place at the
remote end.
Each transmission path must be checked on lines with more than two ends.
3.3.12

Testing User-defined Functions

The device has a vast capability for allowing functions to be defined by the user, especially with the CFC logic.
Any special function or logic added to the device must be checked.
A general procedure cannot in the nature of things be specified. Configuration of these functions and the set
value conditions must be actually known beforehand and tested. Especially, possible interlocking conditions of
the switching devices (circuit breakers, isolators, grounding electrodes) must be observed and checked.

Trip and Close Test with the Circuit Breaker

3.3.13
The circuit breaker and tripping circuits can be conveniently tested by the device 7VK61.
The procedure is described in detail in the SIPROTEC 4 System Description.
If the check does not produce the expected results, the cause may be established from the text in the display
of the device or the PC. If necessary, the connections of the circuit breaker auxiliary contacts must be checked:
220
Measuring the circuit breaker closing time
SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018