Protective Elements
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
»VX
Source=calculated« is set within the corresponding parameter set.
Procedure
Feed a three-phase, symmetrical voltag
e system (V
n) into the voltage measuring inputs of the relay.
Set the limiting value of VX[x] to 90% Vn.
Disconnect the phase voltage at two measuring inputs (symmetrical feeding at the secondary side has to be
maintained).
Now the
»VX calc
« measuring value has to be about 100% of the value Vn.
Ascertain that the signal »VX.A
LARM
« or »VX.T
RIP
« is generated now.
Successful test result
The signal »VX.A
LARM
« or »VX.T
RIP
« is generated.
399
MRU4
DOK-HB-MRU4-2E
