Distribution Voltage

[Hoxton]

I have a friend with a stock generator rated and tested at 10.5 kv +/- 10%

This is so it can be used at 10kv and 11 kv +/- 5%

They have a customer who is in the UK and wants 11kv and finds the ‘continental’ 10 / 10.5 kv very odd and asks for evidence that this is a ‘real’ distribution voltage. Otherwise he wants the generator retested at 11kv.

Do you know of any reference material which lists distribution voltages in this range?

Internet searches give lists of domestic low voltages but none of the distribution

Any ideas?

 

[Mbrooke]

11kv is the typical nominal voltage for the UK and Australia. 10kv is typical nominal for eastern Europe and Russia. As such the upper limits for 11kv will be higher then 10kv in theory and the lower limits lower for 10kv then 11kv.


Considering that 10 and 11kv fall into 12kv class equipment, the generator will probably be fine.

 

[ScottyUK]

Be careful - you're into the voltage range where partial discharge is a definite possibility. Small increases in voltage can cause pronounced differences in PD activity, particularly around the endwindings.

Bear in mind that most industrial 11kV systems in the UK operate with the bar voltage at about 11.5kV to provide margin during motor starts and obviously to account for Ohm's Law, so you're potentially operating long term at the very upper limit of the nominal voltage tolerance.

I'd want it testing too.

 

[capnron]

What about frequency?