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An Electrical Phenomena

By: vaidyanathann_1 | Posted 3 days ago | General | 48 Views

Our Senior got a problem from site and that is the breaker in a particular LV cubicle was tripping every time the load was on it. This had been happening with no solution in sight. The site did all customary checks still the problem persisted, and therefore our head office was contacted.

We as a team got down to the task.

As explained by our senior, we had to do checks on cable lengths that were connected to the tripping breaker.

On checking it was found that it was quite long, longer than usual. This was because the distance was huge between the load and source.

We ran the load flow on the power system study software and found that despite keeping the load disconnected there was current in the feeder as indicated in the power system study software. This current was higher than the earth fault setting of the feeder protection.

This was happening because of the cable capacitance. As the cable was long, longer than usual the capacitive current flowed through it although effectively the load was not connected.

So, the solution was obvious, as we could not do anything about the current because it will flow due to capacitance, we recommended assessing the capacitive current that was flowing through the power system study software.

We then recommended setting the earth fault setting of the feeder protection system above the capacitive current as a solution to the problem which eventually worked.

Hence in electrical systems we must design the earth fault setting above the capacitive current of that feeder.

I hope it was useful to the ones without this information prior to this.

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