Oil immersed test transformer

　　Oil immersed test transformer is a type of power equipment used for high-voltage testing. Its core feature is to immerse the iron core and winding in transformer oil to enhance insulation and cooling effects. The following is a detailed introduction to oil immersed test transformers:

　　1、 Working principle

　　Oil immersed test transformers operate based on the principle of electromagnetic induction. When AC power is applied to the low-voltage side of the transformer, current flows through the low-voltage winding, generating an alternating magnetic field in the iron core. According to the law of electromagnetic induction, an alternating magnetic field will induce a high-voltage alternating voltage in the high-voltage winding. Due to the higher number of turns in the high-voltage winding compared to the low-voltage winding, voltage boosting is achieved, which can generate up to several hundred kilovolts of boosted voltage for voltage withstand testing of electrical equipment.

　　2、 Product Features

　　Excellent insulation performance: Transformer oil has good insulation performance, which can effectively isolate voltage stress between high voltage and ground, improve the insulation strength of the system, and prevent insulation faults such as short circuits between windings and windings and iron cores.

　　Good heat dissipation performance: Transformer oil, as a cooling medium, can effectively dissipate the heat generated during transformer operation, ensuring stable operation of the transformer under rated load.

　　Compact structure: Adopting a multi-level insulation structure and segmented oil passage design to improve insulation performance and solve leakage problems. The iron core uses cold-rolled oriented silicon steel sheets and new fastening materials, combined with a compact box to achieve the characteristics of small volume and light weight.

　　Easy maintenance: Although it is necessary to regularly inspect and maintain the quality of insulation oil, the maintenance work of oil immersed test transformers is relatively simple compared to other types of transformers.

　　3、 Technical indicators

　　Input voltage: usually 0-400V AC.

　　Output voltage: The rated high voltage can reach 200kV AC or 280kV DC, with a capacity covering 0-250kVA.

　　Voltage level: Oil immersed test transformers in China generally have voltage levels of 5, 10, 25, 35, 50, 100, 150, 300kV, etc., which can be used for testing and research of power and electronic equipment.

　　Capacity level: Transformers have capacities of 3, 5, 10, 25, 50, 100, 150, 200kVA, etc. Different capacities correspond to different voltage and current output capabilities.

　　4、 Application scenarios

　　Oil immersed test transformers are widely used in power systems, industrial and mining enterprises, transportation, postal and telecommunications departments, research institutions, etc., to conduct insulation strength tests on various high-voltage electrical equipment, electrical components, and insulation materials under power frequency or DC high voltage. For example:

　　Power system: used for insulation testing of high-voltage equipment in substations, power plants, and other places.

　　Industrial and mining enterprises: used for voltage withstand testing of electrical equipment such as motors and cables.

　　Research institutions: used for high-voltage experimental research, new product development, etc.

　　5、 Precautions for use

　　Regular inspection of insulation oil: It is necessary to regularly check and maintain the quality of insulation oil, including its electrical characteristics, moisture content, and impurity content. If necessary, oil filtration or replacement is required.

　　Follow safety regulations: Relevant safety regulations must be followed during operation to prevent safety hazards caused by high voltage. For example, when conducting a voltage withstand test, a safe distance should be set at the test site, the grounding of the test sample and the test transformer should be carefully checked, and a dedicated person should be assigned to monitor safety and observe the status of the test sample.

　　Pay attention to environmental conditions: Oil immersed test transformers have certain requirements for environmental conditions, such as temperature, humidity, etc. During use, it should be ensured that the environmental conditions meet the equipment requirements.

　　6、 Market price

　　The price of oil immersed test transformers varies depending on factors such as brand, model, and capacity. For example, the price of some brands' 5KVA/50KV AC/DC test transformers may be around 5300 yuan, while the price of three-phase non partial discharge oil immersed induction withstand voltage test devices may be as high as 350000 yuan.