The high-voltage test transformer is a static electrical equipment that is used to change a certain value of AC voltage (current) into another or several voltages (current) of the same frequency with different values. It is the main equipment for power transmission and distribution in the power system. The power transformer mainly reduces the high-voltage power of the grid to 6000 volts (v) or 380 volts (v) that can be used directly to supply power to the electrical equipment.

If there is an overload or short circuit inside the transformer, the insulating material or insulating oil will decompose due to high temperature or electric sparks, expand and even vaporize, causing the internal pressure of the transformer to increase sharply, which may cause the transformer shell to explode, and a large amount of insulating oil will be sprayed and burned. The flow will further amplify the fire hazard.

Pay attention to the operation of high-voltage test transformer:

(1) Overload operation is not allowed: Long-term overload operation will cause the coil to heat up, gradually aging the insulation, and cause a short circuit.

(2) Insulating oil quality should be checked frequently: oil quality should be tested regularly, and unqualified oil should be replaced in time, or other measures should be taken.

(3) Prevent the insulation aging damage of the transformer core, which will cause insulation aging due to long-term heating of the core.

(4) Prevent the insulation from being damaged due to careless maintenance. If scratch damage is found, deal with it in time.

(5) Ensure that the wires are in good contact, and poor contact will cause local overheating.

(6) Prevent lightning strikes, the transformer will burn out due to insulation breakdown

(7) Short-circuit protection: If the transformer coil or load is short-circuited, if the protection system fails or the protection setting is too large, the transformer may be burned. To this end, a reliable short-circuit protection should be installed.

(8) Well-protected grounding.

(9) Ventilation and cooling: If the transformer coil wire is a-class insulation, the insulator is mainly paper and cotton yarn. When the temperature rises by 8°C, the insulation life will be reduced by about half; if the normal temperature of the transformer is below 90°C, the life span is about 20 years; if the temperature rises to 105°C, the life span is 7 years. When the transformer is running, it is necessary to maintain good ventilation and cooling.