6.
Check that the START signal resets.
7.
Instantaneously decrease the voltage in one phase to a value about 20% lower
than the measured operate value.
8.
Measure the time delay for the TRIP signal, and compare it with the set value.
Extended testing
1.
The test above can now be repeated for step
.
2.
The tests above can be repeated for
2 out of 3
and for
3 out of 3
operation mode.
3.
The tests above can be repeated to check security, that is, the START and
operate signals, that are not supposed to appear, - do not.
4.
The tests above can be repeated to check the time to reset.
5.
The tests above can be repeated to test the inverse time characteristic.
6.4.1.2
Completing the test
Continue to test another function or end the testing by setting the parameter
TestMode
to
Off
under
Main menu/Tests/IED test mode/1:TESTMODE
. If
another function is tested, then set the parameter
Blocked
to
No
under
Main menu/
Tests/Function test modes/Voltage/UV2PTUV(27,2U<)/1:UV2PTUV
for the
function, or for each individual function in a chain, to be tested next. Remember to
set the parameter
Blocked
to
Yes
, for each individual function that has been tested.
6.4.2
Two step overvoltage protection OV2PTOV
Prepare the IED for verification of settings as outlined in
.
Values of the logical signals for OV2PTOV are available on the local HMI under
Main menu/Tests/Function status/Voltage/OV2PTOV(59,2U>)/1:OV2PTOV
.
The Signal Monitoring in PCM600 shows the same signals that are available on the
local HMI.
6.4.2.1
Verifying the settings
1.
Apply single-phase voltage below the set value
U1>
.
2.
Slowly increase the voltage until the ST1 signal appears.
3.
Note the operate value and compare it with the set value.
4.
Switch the applied voltage off.
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.
Repeat the test for step
1MRK 511 248-UEN -
Section 6
Testing functionality
61
Commissioning Manual
