Table of Contents
Advertisement
1MRK 504 165-UEN Rev. K
4.
If the test has been performed by injection of current in phase L1, repeat the test, injecting
current into phases L2 and L3 with polarizing voltage connected to phases L2, respectively L3
(1 out of 3 currents for operation).
5.
If the test has been performed by injection of current in phases L1 – L2, repeat the test,
injecting current into phases L2 – L3 and L3 – L1 with the appropriate phase angle of injected
currents.
6.
Connect a trip output contact to a timer.
7.
Set the injected current to 200% of the operate level of the tested stage, switch on the current
and check the time delay.
For inverse time curves, check the operate time at a current equal to 110% of the operate
current for txMin.
8.
Check that all operate and start contacts operate according to the configuration (signal
matrixes).
9.
Reverse the direction of the injected current and check that the protection does not operate.
10.
If 2 out of 3 or 3 out of 3 currents are chosen for operation: Check that the function will not
operate with current in one phase only.
11.
Repeat the above described tests for the higher set stages.
12.
Check that start and trip information is stored in the event menu .
11.5.2.3
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
11.5.3
Instantaneous residual overcurrent protection EFPIOC
Prepare the IED for verification of settings outlined in Section
Values of the logical signals for EFPIOC are available on the local HMI under Main menu /Tests /
Function status /Current protection /InstResidualOverCurrent(50N,IN>>) /
EFPIOC(50N;IN>>):x , where x = 1, 2, and 3.
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.
11.5.3.1
Measuring the operate limit of set values
1.
Inject a phase current into the IED with an initial value below the set value of IN>> and also
make sure that the set value IN>> is in between IN>>Min and IN>>Max.
2.
Increase the injected current in the Ln or in the neutral (summated current input) phase until the
TRIP signal appears.
3.
Switch the fault current off.
4.
Compare the measured operating current with the set value.
Transformer protection RET670
Commissioning manual
Do not exceed the maximum permitted overloading of the current circuits in the
IED.
© 2017 - 2022 Hitachi Energy. All rights reserved
Testing functionality by secondary injection
"Preparing the IED to verify
Section 11
SEMOD56287-118 v4
SEMOD52967-3 v7
settings".
SEMOD52967-11 v9
161
Advertisement
Table of Contents
