Measuring the Operating Time of the Circuit Breaker (only 7SJ64)
Only for Synchronism Check
If device 7SJ64 is equipped with the function for synchronism and voltage check and it is applied, it is neces-
sary – under asynchronous system conditions – that the operating time of the circuit breaker is measured and
set correctly when closing. If the synchronism check function is not used or only for closing under synchro-
nous system conditions, this subsection is irrelevant.
For measuring the operating time a setup as shown in
is recommended. The timer is set to a range
of 1 s and a graduation of 1 ms.
The circuit breaker is connected manually. At the same time the timer is started. After closing the poles of the
circuit breaker, the voltage V
Line
appears and the timer is stopped. The time displayed by the timer is the real
circuit breaker closing time.
If the timer is not stopped due to an unfavourable closing moment, the attempt will be repeated.
It is particularly favourable to calculate the mean value from several (3 to 5) successful switching attempts.
In address 6X20 set this time to
T-CB close
(under Power System Data of the synchronism check). Select
the next lower settable value.
[messung-der-ls-eigenzeit-260602-kn, 1, en_US]
Figure 3-41
Measuring the circuit breaker closing time
Trip/Close Tests for the Configured Operating Devices
Control by Local Command
If the configured operating devices were not switched sufficiently in the hardware test already described, all
configured switching devices must be switched on and off from the device via the integrated control element.
The feedback information of the circuit breaker position injected via binary inputs is read out at the device and
compared with the actual breaker position.
For devices with graphic display this is easy to do with the control display.
The switching procedure is described in the SIPROTEC 4 System Description. The switching authority must be
set according to the command source used. The switching mode can be selected from interlocked and nonin-
terlocked switching. Please note that non-interlocked switching can be a safety hazard.
Control by Protective Functions
For OPEN-commands sent to the circuit breaker please take into consideration that if the internal or external
automatic reclosure function is used a TRIP-CLOSE test cycle is initiated.
3.3.14
3.3.15
Mounting and Commissioning
3.3 Commissioning
SIPROTEC 4, 7SJ62/64, Manual
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C53000-G1140-C207-8, Edition 08.2016
Summary of Contents for SIPROTEC 4
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