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We have site which has been running for 6 months now. It's industrial process served via a 2MVA transformer fed from HV RMU at 11,000V. The transformer is cast resin with less than 1% loss. Our works were installing the transformer and LV panel with a significant post contract fitout by the developer including process supplies. It’s metered at HV but the site is reporting discrepancies between the HV and the LV meter on the incomer. The HV meter is indicating up to 50% more usage than the LV meter. Given that the 2 should generally even out, taking into account transformer and other losses I can only assume they have a significant harmonic issue caused by the process load which is greatly reducing the losses at the transformer. This was my initial thought when I saw the figures. Thoughts from the community?
Thanks in advance.
I had this problem, and the meter which was installed by the DNO's contractor had the CT ratio set incorrectly.
Not being party to their metering I don't know what it is, I assume it's 400/5. What was the outcome in the end?
I cant remember what our ratio is but don't think its 400/5
Copper or iron, or both?
What is the average usage from the LV meter?
The end user has approached the DNO and requested them to investigate their metering setup.