f-Protection Module – Frequency [81O/U, 78, 81R]
Commissioning: delta phi
Object to be tested
All frequency protection stages that are projected as delta phi (Vector Surge).
Necessary means
•
Three-phase voltage source that can generate a definite step (sudden change) of the voltage pointers
(phase shift).
Procedure
Testing the threshold values
•
Apply a vector surge (sudden change) that is 1.5 times the setting value (Example if the setting value is
10° apply 15°).
Successful test result
Permissible deviations/tolerances and fallback ratio can be taken from the Technical Data.
Page 268
EN MRU4 10/09