How to do inspection of voltage transformer JDZX10
When we inspect the voltage transformer JDZX10 type, we need carefully do visual inspection and Insulation performance checking.
(1), visual inspection
- Check whether the package is in good condition and whether the documents are complete when unpacking.
- The surface is not damaged, and the nameplate data is consistent with the techincal requirements.
(2), Insulation performance checking
- Power frequency withstand voltage 3kV / 1min. (Primary winding ground (N) to secondary winding and earth)
- Power frequency withstand voltage is 3kV / 1min. (Secondary winding to secondary winding and earth)
- For Induction withstand voltage test, rated excitation voltage is applied to secondary winding (a.n) terminal, and then primary winding (A) terminal induces the specified voltage value. (Acceptance is 80% of the factory test).
- Error data is equal to the factory testing data.
- Insulation resistance measurement should be bigger than 100MΩ.
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