tested next. Remember to set the parameter
Blocked to Yes, for each individual function that
has been tested.
7.3.3
Four step phase overcurrent protection 3-phase output
OC4PTOC
SEMOD56287-67 v6.1.1
Prepare the IED for verification of settings as outlined in section
.
Values of the logical signals for OC4PTOC 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.
7.3.3.1
Verifying the settings
SEMOD56287-72 v5
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 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.
Set the injected polarizing voltage slightly larger than the set minimum polarizing voltage
(default is 5% of
UBase) and set the injection current to lag the appropriate voltage by an
angle of 55° if forward directional function is selected.
If
1 out of 3 currents for operation is chosen: The voltage angle of phase L1 is the
reference.
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 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).
7.
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.
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
txMin.
11.
Check that all trip and start 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 start and trip information is stored in the event menu.
Verification of the non-directional phase overcurrent function is done as
instructed above, without applying any polarizing voltage.
1MRK 505 293-UEN B
Section 7
Testing functionality
Breaker protection REQ650
45
Commissioning manual
© Copyright 2013 ABB. All rights reserved
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