4.
Close the switch to the station earth and check that the trip from the rotor earth fault will
be given after the set delay time.
5.
Open the switch to the station earth and check that the trip signal resets
instantaneously.
6.
Connect an adjustable resistor to the field circuit (221 on RXTTE4). Decrease this resistor
from a large value until the function operates and check monitored value
ICOSFI.
When the generator has been started the service value of injection voltage and injection
current shall be checked so that there is no risk for unwanted trip due to large capacitive
detected current.
12.4.16.2
Completing the test
SEMOD158692-35 v2
Continue to test another function or end the test by changing the
TestMode setting to Off.
Restore connections and settings to their original values, if they were changed for testing
purposes.
12.5
Current protection
SEMOD53531-1 v1
12.5.1
Instantaneous phase overcurrent protection 3-phase output
PHPIOC
M11754-3 v7
Prepare the IED for verification of settings as outlined in section
and
in this chapter.
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.
12.5.1.1
Measuring the operate limit of set values
M11754-11 v6
1.
Inject a phase current into the IED with an initial value below that of the setting.
2.
Set the operation mode to
1 out of 3.
3.
Increase the injected current in the Ln phase until the TRL (n=1–3) signal appears.
4.
Switch the fault current off.
Observe: Do not exceed the maximum permitted overloading of the
current circuits in the IED.
5.
Compare the measured operating current with the set value.
6.
Set the operation mode to
2 out of 3 and inject current into one of the phases. Check - no
operation.
12.5.1.2
Completing the test
M11754-24 v5
Continue to test another function or end the test by changing the
TestMode setting to Off.
Restore connections and settings to their original values, if they were changed for testing
purposes.
Section 12
1MRK 502 067-UEN B
Testing functionality by secondary injection
154
Commissioning manual
