An oil-immersed test transformer is a specialized transformer used for testing high-voltage electrical equipment. It is primarily employed for testing and inspecting high-voltage equipment within the power system, such as substations and transmission lines, to ensure safe operation and compliance with performance standards.
The main features and applications of the oil-immersed test transformer are as follows:


Insulating Medium: The insulating medium for oil-immersed test transformers is typically insulating oil, which boasts excellent insulation and thermal conductivity properties, effectively isolating and dissipating heat.
High Voltage Output: The oil-immersed test transformer can provide high voltage output to meet the testing requirements of high-voltage equipment.
Adjustment Function: Oil-immersed test transformers usually have the capability to adjust the output voltage, allowing for voltage regulation and control as per testing requirements.
Safety Protection: The oil-immersed test transformer is equipped with various safety protection devices, including overload protection, short-circuit protection, and temperature protection, to ensure the safety of the testing process.
Widely Used: Oil-immersed test transformers are extensively employed in high-voltage equipment testing within the power system, including insulation strength tests, partial discharge tests, and load tests, among others.


Oil-immersed test transformers play a crucial role in electrical equipment testing, providing stable high-voltage output and a reliable testing environment. They offer advantages such as efficiency, controllability, and safety, and are widely used in testing and inspection work within the power system.