Generators

[madzer1988]

I have a 250kva generator supplying a small area with 2 local distribution boards. A 5 core cable goes to the main board and from there there's a 4 core going to one local board and then looped to the other ,with earth bars at both , the earths are neutralised at theses local boards , there was a heavy shower of rain one day and the generator main breaker tripped without the other 2 local boards tripping first , should the generator not be the last to trip I'm confused any explanation wud be appreciated folks thanks

 

[Essex1]

Depends where the fault was.

 

[madzer1988]

Wud u know of any reason the genny should trip out , a heavy shower of rain shouldn't cause it to trip out

 

[Rob_the_rich]

Don't know much about generators, but possibly a fault on the first cable causing the upstream fuse to blow. Or not enough discrimination between upstream and downstream fuses. What fuses were used?

 

[Essex1]

There are so many possibilities it would be crazy to list them all.

 

[steptoe]

how is the genny earthed?

 

[Tony S]

I have a 250kva generator supplying a small area with 2 local distribution boards. A 5 core cable goes to the main board and from there there's a 4 core going to one local board and then looped to the other ,with earth bars at both , the earths are neutralised at theses local boards , there was a heavy shower of rain one day and the generator main breaker tripped without the other 2 local boards tripping first , should the generator not be the last to trip I'm confused any explanation wud be appreciated folks thanks

Earth fault protection on the generator doing its job

 

[Andy™]

how is the genny earthed?

sounds like TNS at the first board than TNC at the others?