Shear load transformer will produce over-voltage transformer what measures to protect

Pressure is a big inductive element, the runtime energy storage windings, when cut off-load transformer, the transformer in the electrical energy will be generated on an over-voltage circuit breaker in the neutral mcb circuit breaker, off 110 ~ 330 kV mcb circuit breaker no-load, over-voltage multiplier which generally does not exceed 3.0Uxg, the neutral point directly to ground 35 kV grid, usually no more than 4.0Uxg, this time with the high-voltage side of the transformer should be air circuit breaker installation of valve type arrester, as no-load transformer winding magnetic energy than the valve-type arrester allows the energy is much smaller, so that protection is reliable and should not be in the non-Lei season exit.