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Section 11
Testing functionality by secondary injection
11.5.2
Directional phase overcurrent protection, four steps OC4PTOC
Prepare the IED for verification of settings outlined in Section
Values of the logical signals for OC4PTOC are available on the local HMI under Main menu/Tests/
Function status/Current protection/PhaseOverCurrent4Step(51_67,4(3I>)) /
OC4PTOC(51_67;4(3I>)):x, where x = instance number.
The Signal Monitoring in PCM600 shows the same signals that are available on the local HMI.
11.5.2.1
Function revision history
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revision
A
B
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D
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11.5.2.2
Verifying the settings
1.
Connect the test set for current injection to the appropriate IED phases.
If there is any configuration logic that is used to enable or block any of the four available
overcurrent steps, make sure that the step under test is enabled (for example, end fault
protection).
If 1 out of 3 currents are chosen for operation: Connect the injection current to phases L1 and
neutral.
If 2 out of 3 currents are chosen for operation: Connect the injection current into phase L1 and
out from phase L2.
If 3 out of 3 currents are chosen for operation: Connect the symmetrical three-phase injection
current into phases L1, L2 and L3.
2.
Connect the test set for the appropriate three-phase voltage injection to the IED phases L1, L2
and L3. The protection shall be fed with a symmetrical three-phase voltage.
3.
Block higher set stages when testing lower set stages by following the procedure described
below:
3.1. Set the injected polarizing voltage larger than the set minimum polarizing voltage (default
154
Product
History
revision
2.2.1
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2.2.1
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2.2.2
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2.2.3
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2.2.3
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2.2.4
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2.2.4
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2.2.4
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2.2.5
•
The harmonic restraint function changed to freeze the definite and IDMT timers.
•
The maximum value of the settings IMin1, IMin2, IMin3 and IMin4 has been
decreased to 1000.0 % of IBase.
The verification of the non-directional phase overcurrent function is done as
instructed below, but without applying any polarizing voltage.
is 5% of UBase) and set the injection current to lag the appropriate voltage by an angle of
about 80° if forward directional function is selected.
If 1 out of 3 currents are chosen for operation: The voltage angle of phase L1 is the
reference.
© 2017 - 2022 Hitachi Energy. All rights reserved
1MRK 505 378-UEN Rev. K
"Preparing the IED to verify
GUID-154CAE8E-8FD4-460C-852D-6E5C93545F0D v1
Line differential protection RED670
Commissioning manual
SEMOD56287-67 v9
settings".
SEMOD56287-72 v10
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