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Industrial site electricity supply expected infrastructure losses with 200KW load

MPC

Hi All, I'm more an electronics engineer but I work on an industrial estate supplied by a single HV meter. The estate has several units each one sub metered from a resident 500KVA transformer.

When comparing the main incoming supply meter reading with the total of the sub-meter readings we get an average 10% difference. So a total load of 200KW the metering suggests there is 20KW of losses.

Does this seem normal for a 500KVA transformer and associated infrastructure? 

The electric bill shows a KVArh value which is 10% of the KWh total but all the meters work in KWh so not sure if this is a red herring.

Many Thanks,

MPC.

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  • 0

    The transformer losses will be a lot lower - expect no more than 1% or so, or boiling transformer oil (!),  but the power losses will be in distribution.(240V at the transformer becoming 220 something at the far end of a long submain to a building..) 10% for that is quite credible if its a large campus. Without knowing a bit more about the layout its hard to say -  do you have large loads on the ends of hundred metre cable runs ?

    Mike.

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  • 0

    The transformer losses will be a lot lower - expect no more than 1% or so, or boiling transformer oil (!),  but the power losses will be in distribution.(240V at the transformer becoming 220 something at the far end of a long submain to a building..) 10% for that is quite credible if its a large campus. Without knowing a bit more about the layout its hard to say -  do you have large loads on the ends of hundred metre cable runs ?

    Mike.

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  • 0 in reply to mapj1

    Hi. The submeters are in the same hut as the 500KVA transformers and the run from the main site meter to the transformer is 60 metres.

    The transformer is about 30years old and has a regular service and oil change. I have been monitoring the transformer surface temperature and we are seeing a 20degC rise in surface temperature for around a 200KW loading.

    Thanks

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