Power transformer overvoltage hazard

Several generated grid overvoltage, the real transformer insulation and impact protection, depending on the over-voltage waveform. Amplitude and duration. Examination equipment Electric energy meter waveform has three levels: pre-lightning wave shortwave, longwave before operation and low frequency wave voltage wave. Equipment insulation against lightning, operation or frequency voltage tolerance should be appropriate to test the voltage waveform.
In the over-voltage Voltage stabilizer damage accident, lightning overvoltage cause damage to insulation breakdown probability at most. When the grid being struck by lightning in the line conductor will produce a large amplitude, very short duration of action aperiodic pulse voltage wave, it is the speed of light along the transmission line arrester discharge first, the aftermath, through the transformer into the ground, when the aftermath of the the transformer protection arrester,mcb circuit breakera voltage drop (residual pressure) acting on the transformer. If the transformer and electrical distance exists between the arrester, residual pressure before entering the distance of the wires in the oscillation caused by voltage increases, the resulting increase in transformer voltage is higher than the residual pressure, and thus threaten the safety transformer insulation. Therefore, installation of transformer protection surge arresters, surge arresters and the transformer should be maintained to achieve zero distance.
Occur within the grid resonance over-voltage or over-voltage, over-voltage whose amplitude is high, longer duration. Can also endanger the safety of operation of the transformer, or even lead to the destruction of the transformer insulation breakdown.