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Hello Subscriber
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one step to avoid technical losses is regular verification on site. A rarely used item is the burden measurement of instrument transformers. Since a user was asking, we've made a small tutorial.
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I have to admit that I also use this function only for debugging. Top priority is to assure the accurate billing of transformer operated meters. So, typically you would make in case of current transformers (CTs) an error measurement from the primary side first.
This covers the CT-ratio error, phase displacement, burden and the meter error.
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If you have a high-precision installation, the error will be most likely out of range. In that case you use the calibration reports for primary-side clamps to get the real error.
If there is still a problem, you do an instrument transformer ratio test.
Only if everything looks good on the transformer side, you will do a burden measurement. Finally, you make an accuracy test on the secondary side. Then you have figured out all possible sources for the error one by one.
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Instrument transformers are part of the measurement circuit for transformer operated meters.
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In order to protect the utility revenue it's essential to do regular on-site tests on meter installations.
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Thank you for your interest and stay safe. If you have other metering-related questions, just drop us a mail.
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Reinhard Günther
and the CLOUGLOBAL Team
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The 15th International Solar Photovoltaic Exhibition 2021 will be held from June 3-5 at the Shanghai New International Expo Center. It’s one of the largest photovoltaic exhibitions in the world.
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Meet the CLOU experts at booth no. E4-550 and get all details of our latest developments.
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