Four Step Phase Overcurrent Protection 3-Phase Output Oc4Ptoc (51_67); Verifying The Settings - ABB RET650 Series Commissioning Manual

Section 7
Testing functionality
7.4.2 Four step phase overcurrent protection 3-phase output
OC4PTOC (51_67)
Prepare the IED for verification of settings as outlined in section
settings.
Values of the logical signals for OC4PTOC (51_67) are available on the local HMI under Main menu/
Tests/Function status/Current/OC4PTOC(51_67,4I>)/OC4PTOC:1. The Signal Monitoring in
PCM600 shows the same signals that are available on the local HMI.
7.4.2.1

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).
Connect the symmetrical three-phase injection current into phases A, B and C.
2. Connect the test set for the appropriate three-phase voltage injection to the IED phases A, B
and C. The protection shall be fed with a symmetrical three-phase voltage.
3. Set the injected polarizing voltage slightly larger than the set minimum polarizing voltage
(default is 5% of
angle of 55° if forward directional function is selected.
1 out of 3 currents for operation is chosen: The voltage angle of phase A is the reference.
If
If reverse directional function is selected, set the injection current to lag the polarizing
voltage by an angle equal to 235° (equal to 55° + 180°).
4. Increase the injected current and note the operate value of the tested step of the function.
5. Decrease the current slowly and note the reset value.
6. If the test has been performed by injection of current in phase A, repeat the test, injecting
current into phases B and C with polarizing voltage connected to phases B, respectively C (
out of 3 currents for operation).
7. If the test has been performed by injection of current in phases AB, repeat the test, injecting
current into phases BC and CA with the appropriate phase angle of injected currents.
8. Block higher set stages when testing lower set stages by following the procedure described
below.
9. Connect a trip output contact to a timer.
10. 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
11. Check that all trip and pickup contacts operate according to the configuration (signal
matrixes)
12. Reverse the direction of the injected current and check that the protection does not operate.
13. Repeat the above described tests for the higher set stages.
14. Finally check that pickup and trip information is stored in the event menu.
50
VBase ) and set the injection current to lag the appropriate voltage by an
txMin .
Verification of the non-directional phase overcurrent function is done as
instructed above, without applying any polarizing voltage.
© Copyright 2013 ABB. All rights reserved
1MRK 504 136-UUS B
Preparing the IED to verify
Transformer protection RET650
Commissioning manual
SEMOD56287-67 v6.1.1
SEMOD56287-72 v5
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