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Inspection and test provisions for on - load tap - changer of power transformers

First, in the switch to take out the check, measure the current limiting resistor resistance, the measured value compared with the factory value of the product should be no significant difference.
Second, check the switch to take out the check, check the switch to switch the contact of all the action sequence, should meet the technical requirements of the product.
Third, check the switching device in the whole process of switching, there should be no open circuit; electrical and mechanical limit action is correct and meet product requirements; in the operation of the power supply voltage is rated at 85% and above, the whole process of switching should be reliable action.
Fourth, in the transformer without voltage operation 10 cycles. In the no-load under the provisions of the technical conditions to check the switching device voltage regulation, the three-phase switching synchronization and voltage range and the law, compared with the product factory data should be no significant difference.
Fifth, the insulating oil into the switch before the switch tank, the electrical strength should be consistent with the provisions.