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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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    BS 7671 allows a 5% voltage drop in general - potentially a little more if you have private transformers and normal (DNO) distribution rules allow anything up to 16% after the transformer - although what shows up on the meters will depend on where the meter is compared with the general lengths of cables. So adding in the transformer losses you might not be out of the ball park as it were. It all depends....

        - Andy.

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    BS 7671 allows a 5% voltage drop in general - potentially a little more if you have private transformers and normal (DNO) distribution rules allow anything up to 16% after the transformer - although what shows up on the meters will depend on where the meter is compared with the general lengths of cables. So adding in the transformer losses you might not be out of the ball park as it were. It all depends....

        - Andy.

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