After a major overhaul of pilot projects transformer

(1) together with the casing of the winding insulation resistance and the absorption ratio, AC voltage test, electric meter test. (2) Check the location of the tap winding of the DC resistance along the casing. (3) Check all tap vCircuit breaker and phase wiring group. (4) Measured with various fasteners and core insulation core grounding wire leads to the insulation rmcb circuit breaker of the shell casing. (5) of the insulating oil test. (6) tap inspection and testing. (7) the impact of closing test.