6.6.3 Two step residual overvoltage protection ROV2PTOV
Prepare the IED for verification of settings as outlined in
5.1 "Preparing the IED to
verify settings".
Values of the logical signals for ROV2PTOV are available on the local HMI under
Main menu/Tests/Function status/Voltage/ROV2PTOV(59N,2UN>)/
ROV2PTOV:1. The Signal Monitoring in PCM600 shows the same signals that are
available on the local HMI.
6.6.3.1 Verifying the settings
1. Apply the single-phase voltage either to a single-phase voltage input or to a
residual voltage input with the start value below the set value U1>.
2. Slowly increase the value until ST1 appears.
3. Note the operate value and compare it with the set value.
4. Decrease the voltage slowly and note the reset value.
5. Set and apply about 20% higher voltage than the measured operate value for one
phase.
6. Measure the time delay for the TR1 signal and compare it with the set value.
7. Check the inverse time delay by injecting a voltage corresponding to 1.2 × U1>.
For example, if the inverse time curve A is selected, the trip
signals TR1 and TRIP operate after a time corresponding to the
equation:
IECEQUATION2429 V1 EN (Equation 29)
where:
t(s) Operate time in seconds
k1 Settable time multiplier of the function for step 1
U Measured voltage
U1> Set start voltage for step 1
For example, if the measured voltage jumps from 0 to 1.2 times the set start
voltage level and time multiplier k1 is set to 0.05 s (default value), then the TR1
and TRIP signals operate at a time equal to 0.250 s ± tolerance.
8. Repeat the test for step 2.
Section 6 1MRK 502 049-UEN A
Testing functionality
84
Commissioning manual
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