PF Protection Module – Power Factor [ANSI 55]
Testing the trip delay (PF Trigger: Example = 0.86 lagging)
•
Feed rated voltage and rated current in phase to the measuring inputs of the relay (PF=1).
•
Adjust the angle between voltage and current (current pointer lagging) with an abrupt change to
PF = 0.707 (45°) lagging.
•
Measure the tripping delay at the output of the relay. Compare the measured tripping time to the
parameterized.
Testing the fallback ratio (PF Reset: Example = 0.86 leading)
•
Adjust the angle between voltage and current (current pointer leading) with an abrupt change to
PF = 0.707 (45°) leading.
•
Measure the tripping delay at the output of the relay. Compare the measured tripping time to the
parameterized.
Successful test result
The measured total tripping delays or individual tripping delays, threshold values and fallback ratios correspond
with those values, specified in the adjustment list. Permissible deviations/tolerances can be found under Tech-
nical Data.
EN MRA4 04/09
Page 401
Содержание SEG HighPROTEC MRA4
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