3 Mounting and Commissioning
422
7SA522 Manual
C53000-G1176-C155-3
The circuit breaker is closed manually. At the same time the timer is started. After
closing the poles of the circuit breaker, the voltage U
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.
Set the calculated time under address as 7&%FORVH (under 36\VWHP'DWD
). Select the next lower settable value.
Note
The operating time of the accelerated output relays for command tripping is taken into
consideration by the device itself. The tripping command is to be allocated to a such
relay. If this is not the case, add 3 ms to the measured circuit-breaker operating time
for achieving a greater response time of the “normal” output relay. Subtract 4 ms from
the circuit-breaker operating time if high-speed-relays are in service.
Figure 3-28 Measuring the circuit breaker closing time
3.3.12 Testing of the Teleprotection System with Distance Protection
Note
If the device is intended to operate with teleprotection, all devices used for the trans-
mission of the signals must initially be commissioned according to the corresponding
instructions.
The following section applies only for the conventional transmission procedures. It is
not relevant for usage with protection data interfaces.
For the functional check of the signal transmission, the earth fault protection should be
disabled, to avoid signals from this protection influencing the tests: address )&7
(DUWK)OW2& = 2)).
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