By hvhipot 
The high-voltage test transformer is a type of transformer family, which is safe, reliable, powerful, easy to use, and simple to maintain. The high-voltage test transformer is mainly used for the insulation strength test of various electrical products, electrical components, insulating materials, etc. under the specified voltage. In order to assess the insulation level of the product, find the insulation defect of the test product, and measure the ability of overvoltage, it is equipped with equipment for the relevant departments of electric power operation, electrical appliances manufacturing enterprises, metallurgy, coal mines, and electrified railway departments.
During the use of the high-voltage test transformer, there will occasionally be abnormal sounds. What is the reason for this? How to deal with it.
1. Abnormal sound
During the operation of the distribution change, due to the effect of the alternating magnetic flux, the transformer core silicon steel sheet vibrates and makes a sound. During normal operation, this sound is clear and regular, but when the load of the transformer changes significantly or the operation state is abnormal, the sound will increase more than usual, with intermittent noise or rough sound, collectively called abnormal sound.
2. Reason analysis and treatment of abnormal sound produced by high-voltage test transformer
1. The sound is obviously increased, but relatively uniform. This abnormal sound is generally caused by excessive load.
It can be determined by measuring the load or touching the temperature of the distribution transformer housing. Find out the cause of the overload and reduce the overload that exceeds the allowable range. It is a serious overload, and the possibility of deterioration and damage of the distribution transformer insulation should be considered, and further necessary tests should be done.
2. The distribution transformer has shock loads, such as frequent starting of larger motors, intermittent work of electric welding machines, etc., which cause sudden increases and decreases in sound and irregular changes.
A clear judgment can be made by measuring the load. As long as it does not exceed the allowable load standard and does not exceed the allowable voltage fluctuation, it does not need to be dealt with; if it exceeds the allowable range, it should be dealt with after clarifying the responsibilities. If the user equipment is approved for use, the power supply department should consider increasing the capacity of the distribution transformer; if the user equipment is used without approval, it will not only be required to stop using it immediately, but also impose necessary penalties.