Woodward HighPROtec MCDLV4, Manual, Page: 846 / 1275

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.
846 MCDLV4 DOK-HB-MCDLV4-2E