VE-Protection Module – Residual Voltage [59N]
Commissioning: Residual Voltage Protection - Calculated [59N]
Object to be tested
Test of the residual voltage protection elements
Necessary means
•
3-phase voltage source
Calculation of the residual voltage is only possible if phase voltages (star)
were applied to the voltage measuring inputs and if
»VT con=phase-to-
neutral«
and
»EVT con=calculated«
were set in the field parameters.
Procedure
•
Feed a three-phase, symmetrical voltage system (Vn) into the voltage measuring inputs of the relay.
•
Set the limiting value of VE[x] to 90% Vn.
•
Disconnect the phase voltage at two measuring inputs (symmetrical feeding at the secondary side has to
be maintained).
•
Now the »v
E«
measuring value has to be about 100% of the value Vn.
•
Ascertain that the signal »VE.A
LARM
« or »VE.T
RIP
« is generated now.
Successful test result
The signal »VE.A
LARM
« or »VE.T
RIP
« is generated.
Page 252
EN MRU4 10/09
