Woodward HighPROTEC MRU4, Руководство пользователя

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VE-Protection Module – Residual Voltage [59N]
Commissioning: Residual Voltage Protection - Measured [59N]
Object to be tested
Residual voltage protection stages.
Necessary components
•
1-phase AC voltage source
•
Timer for measuring of the tripping time
•
Voltmeter
Procedure (for each element)
Testing the threshold values
For testing the threshold and fallback values, the test voltage at the measuring input for the residual voltage has
to be increased until the relay is activated. When comparing the displayed values with those of the voltmeter, the
deviation must be within the permissible tolerances.
Testing the trip delay
For testing the trip delay a timer is to be connected to the contact of the associated trip relay.
The timer is started when the limiting value of the tripping voltage is exceeded and it is stopped when the relay
trips.
Testing the fallback ratio
Reduce the measuring quantity to less than 97% of the trip value. The relay must only fall back at 97% of the trip
value at the latestly.
Successful test result
The measured threshold values, trip delays and fallback ratios comply with those specified in the adjustment list.
Permissible deviations/tolerances can be taken from the Technical Data.
EN MRU4 10/09 Page 251