6.3
Testing current protection functions
6.3.1
Instantaneous phase overcurrent protection PHPIOC
Prepare the IED for verification of settings as outlined in
Values of the logical signals for PHPIOC are available on the local HMI under
Main menu/Tests/Function status/Current/PHPIOC(50,I>>)/1:PHPIOC
. The
Signal Monitoring in PCM600 shows the same signals that are available on the
local HMI.
To verify the settings the following fault type should be tested:
•
Phase-to-earth fault
Ensure that the maximum continuous current, supplied from the current source
used for the test of the IED, does not exceed four times the rated current value of
the IED.
6.3.1.1
Measuring the operate limit of set values
1.
Inject a phase current into the IED with an initial value below that of the setting.
2.
Increase the injected current until the TRIP signal appears.
3.
Switch the fault current off.
Observe: Do not exceed the maximum permitted overloading
of the current circuits in the IED.
4.
Compare the measured operating current with the set value.
6.3.1.2
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/Current/PHPIOC(50,I>>)/1:PHPIOC
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.
6.3.2
Four step phase overcurrent protection OC4PTOC
Prepare the IED for verification of settings as outlined in
Section 6
1MRK 511 248-UEN -
Testing functionality
40
Commissioning Manual
