Fuse cuts out when the transformer is switched on. What could be de reason? How to eliminate?

Question

In our lab we hav a 5kVA tranformer, when it is switched on for doing experiments the fuse dips most of the time. Its not s/c, coz once it is some how switched on without dipping de fuse ( which some times happen) means it works on smoothly. What is the reason and remedy?

Answer 1

Since I'm not familiar with your equipment and don't know the value of the resistor. I can only give you some advise. . You need to purchase "SLOW BLOW" fuses. These will prevent Dipping/blowing as soon as the circuit is energized. Other than that check the circuitry of the attached components to the transformer for shorts Or plainly too many loads in the circuit, allowing the current to flow to the loads at a rate larger that what your given fuse can handle. Experiment: Disconnect the transformer from project. Does fuse blow. Yes = too small of a fuse or internal damage of the transformer. It could be an intermittent fault. The transformer behaves well when the fault is not active.Hope this helps. will.

Answer 2

fuses are used to protect electronic equipment and wiring, fuse is set to adequate size that allows normal operation of devices it protects. You either have a short circuit or perhaps an added device that was not intended to be on the circuit. I would look for anything that was done since the last time circuit was known to work and troubleshoot from there.
Sometimes when designing circuits people take amperage at a given , inductance and in rush currents get forgot. You may have a motor or transformer that is not always running when powered up.

Answer 3

It is either a Short circuit or the fuse is too Low an amperage for what you are doing.

Better the latter way though.

Answer 4

there may be any wiring mistakes , some operating problem , the rating of the fuse may be of low capacity.
first check the terminals of the connections , check the bushings , check the switches and also switchboards.

Answer 5

HUH?