Siemens 6MD85, Manual

Page: 1061 / 1256

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Figure 10-2 Measurement of the Circuit-Breaker Closing Time
Checking the Measurement Chain
The measurement chain for the voltage measurement must be checked. As soon as one of the synchronization
stages to be used is closed, all the necessary functional measured values are calculated. The synchronization
stage, thus, does not have to be started for this check.
Proceed as follows when checking the measurement chain as a primary or secondary test:
a) As primary test
²
Establish a synchronous state by closing the circuit breaker, if possible.
²
Check the functional measured values within the synchronization function:
– The delta values must be 0.
– Check the voltages V1 and V2 for plausible values in comparison with the operational measured values
for the voltage.
– Check the frequencies f1 and f2 for plausible values in comparison with the operational measured
value for the frequency.
b) As secondary test
²
Establish a synchronous state by applying synchronous voltage values at both measuring points.
²
Check the functional measured values within the synchronization function:
– The delta values must be 0.
– Check the voltages V1 and V2 for plausible values in comparison with the operational measured values
for the voltage.
– Check the frequencies f1 and f2 for plausible values in comparison with the operational measured
value for the frequency.
Blind Switching Attempts when Used in Machines
Perform blind switching attempts when using the function in machines.
Requirement:
²
You have checked the setting values again.
²
The circuit breaker is switched off. The close command for the circuit breaker is interrupted (discon-
necting the close command). The system voltage is switched through for the measurement.
a) Attempt with asynchronous systems:
²
Via manual control set the generator to a speed slightly below the permitted frequency difference
according to the setting values
Max. frequency diff. f2>f1
and
Max. frequency diff.
f2<f1
. The generator is excited to line voltage. You can read out the values in the operational measured
values.
Functional Tests
10.2 Primary and Secondary Testing of the Synchronization Function
SIPROTEC 5, High-Voltage Bay Controller, Manual 1061
C53000-G5040-C015-9, Edition 11.2017