Four Step Phase Overcurrent Protection 3-Phase Output Oc4Ptoc; Verifying The Settings - ABB RELION REG670 Commissioning Manual

1MRK 502 067-UEN B
12.5.2 Four step phase overcurrent protection 3-phase output
OC4PTOC
Prepare the IED for verification of settings as outlined in section
section
12.5.2.1

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).
1 out of 3 currents for operation is chosen: Connect the injection current to phases L1
If
and neutral.
2 out of 3 currents for operation is chosen: Connect the injection current into phase L1
If
and out from phase L2.
3 out of 3 currents for operation is chosen: Connect the symmetrical three-phase
If
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.
3.2.
3.3.
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 (
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
8. Check that all operate and start contacts operate according to the configuration (signal
matrixes).
Commissioning manual
"Preparing for test" in this chapter.
Verification of the non-directional phase overcurrent function is done as
instructed below, without applying any polarizing voltage.
Set the injected polarizing voltage slightly larger than the set minimum polarizing
voltage (default is 5% of
voltage by an angle of about 80° if forward directional function is selected.
1 out of 3 currents for operation is chosen: The voltage angle of phase L1 is the
If
reference.
2 out of 3 currents for operation is chosen: The voltage angle of phase L1 – the
If
voltage angle of L2 is the reference.
3 out of 3 currents for operation is chosen: The voltage angle of phase L1 is the
If
reference.
If reverse directional function is selected, set the injection current to lag the
polarizing voltage by an angle equal to 260° (equal to 80° + 180°).
Increase the injected current, note the operate value of the tested step of the
function and compare it to the set value.
Decrease the current slowly, note the reset value and compare it to the reset ratio
95%.
1 out of 3 currents for operation).
txMin .
UBase ) and set the injection current to lag the appropriate
Testing functionality by secondary injection
"Requirements" and
Section 12
SEMOD56287-67 v7
SEMOD56287-72 v9
155