when
transformer core earthing line breaks, the
transformer will give a light discharging sound.
（6）internal discharge
when there is a sharp sound of hammering during the process of transmission, it is the discharging voice of the conductive lead to the
transformer shell through the air; And if it is a clatter sound, it is the discharging sound of the conductor to the shell through the
transformer oil. And if there is not enough insulation distance, then it should cut power for hanging inspection to strengthen the insulation ability or set the insulating baffles.
（7）external line breaks or is short-circuit
When the circuit breaks in the conductive line contact or T-contact, or break-contact alternating when it is windy, and there will be arc light or sparks when contact, and the
transformer will give a frog sound; when there is earthing or short-circuit fault about the LV lines, the transoformer will give a sound of skirr; and if the short-circuit is at close, the
transformer will give a tiger screaming sound.
（8）
transformer overload
when severe overload, the
transformer will give a sound of buzzing.
（9）over voltage
when the power voltage is too high, the
transformer will overexcited, the noise is lounder and sharp.
（10）winding short-circuit
when the short-circuit happens among the layers or turns of the winding and cause the burning, the
transformer will give a water boiling sound.
there are many factors for the transformal abnormal noise, and the fault places are also different, it can only make the right judgement by the accumulated experience
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