scheider electric MiCOM P746, Technical Manual

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P746/EN CM/F21 Commissioning and Maintenance
(CM) 10-24 MiCOM P746
CM
To test the Phase comparison pick-up only:
When an unlatched Led or a unlatched output relay is mapped on a PhComp Blk Zx or
PhComp Blk Zx Y ddb, the 2 following tests can be performed.
Note: PhCompBlk Zx ddb is an AND gate of the PhComp Blk Zx A, B, C
ddbs so it will only change for three phase test.
One showing no operation at m = 99% of x% and one showing operation at n = 101% of x%.
First test:
•
Inject outgoing I
1
= m% of CT1 and ingoing I
2
.= I
1
for 10s (for example).
•
No Led or relay output pick-up
Second test:
•
Inject outgoing I
1
= n% of CT1 and ingoing I
2
.= I
1
for 10s (for example).
•
Led or relay output pick-up
Note: The same test can be performed to test it on the CZ using the
adequate ddbs.
6.2.1.2 Slopes and thresholds
If a LED has been assigned to display the trip information, these may be used to indicate
correct operation. If not, monitor option will need to be used – see the next paragraph.
On P746 go to GROUP1-->BUSBAR PROTECT and set I
D
>1 Alarm timer to 100s
Then go to COMMISSION TESTS column in the menu, scroll down and change cells
[Monitor Bit 1] to [BUSBAR_TRIPPING]. Doing so, cell [Test Port Status] will appropriately
set or reset the bits that now represent BUSBAR_TRIPPING (with the rightmost bit
representing Busbar Trip. From now on you should monitor the indication of [Test Port
Status]. Make a note of which elements need to be re-enabled or re-set after testing.
Test of I
D
>2:
I
D
>1 Alarm Timer should be set to 100s during testing.
Inject a I
2
current smaller than I
D
>2 and slowly increase I
2
until tripping.
Test of the operating time of the differential element:
Inject a I
2
current greater than twice I
D
>2 threshold and measure the operating time of the
differential element.
Test of I
D
>1:
I
D
>1 Alarm Timer should be set to 100ms.
Inject a I
2
current smaller than I
D
>1 and slowly increase I
2
until circuit fault appears (LED
Alarm of LED circuitry fault).
Test of I
D
>1 Alarm Timer:
I
D
>1 Alarm Timer should be set to 5s.
Inject a I2 current greater than twice the I
D
>1 threshold and check that the Circuitry Fault
Alarm is coming in 5s.