Analysis of Oil Leakage Fault in Oil Immersed Transformers

What is the cause of oil leakage in oil immersed transformers? Next, the editor will give you a brief introduction.

1. Welding quality

The shell of an oil immersed transformer is a combination of welded and connected steel plates. Due to the long weld seam and numerous welded joints, high requirements are put forward for welding. However, due to the influence of environment, temperature, experience, skills, welding materials, and plates, the quality results after welding are also different. Welding cracks and sand holes are the main causes.

2. Sealing quality

The selection of type and material is the main cause of problems in the use of seals.

3. Oil immersed transformer seal aging

Climate, usage, and oil corrosion are the main causes of aging of seals.

4. Operating environment

The changes in environmental temperature have a significant impact on transformers. Due to temperature changes, parts such as welding, connection, and sealing have different amounts and directions of deformation due to different materials. Over time and under the influence of other environmental factors such as wind, sand, humidity, etc., welded components are prone to occur. Leakage of seals and connections.

5. Installation and Maintenance

① The flange or sealing joint is uneven, and the surrounding force is uneven during installation and tightening, resulting in leakage during use.

② The flange joint is deformed and misaligned, resulting in high stress on one side of the gasket and low stress on the other side. The gasket on the other side leaks due to insufficient compression, which mainly occurs at the connection of the gas relay, radiator, and main body;

③ When installing gaskets, insufficient or excessive compression can lead to leakage during use. When the compression capacity is insufficient, the viscosity of transformer oil decreases with the increase of working temperature, leading to oil leakage; When the compression capacity is too large, the sealing gasket deforms severely, accelerates aging, and shortens its service life.

④ Others.

6. Transportation and hoisting of oil immersed transformers

During transportation or lifting, if there is a collision, the parts are prone to deformation, welding, or cracking, resulting in leakage, especially the heat dissipation fins are easily damaged.

ZC-501A series oil immersed test transformer is a new product developed and produced in accordance with DL/T848.2-2004 General-purpose technology for High Voltage Test Equipment – Part 2: Power Frequency High Voltage Test Equipment. This series of products has the characteristics of small size, light weight, compact structure, complete functions, strong universality, and convenient use. It is particularly suitable for conducting insulation strength tests on various high-voltage electrical equipment, electrical components, and insulation materials under power frequency or DC high voltage in power systems, industrial and mining enterprises, scientific research departments, etc. It is an essential and important equipment in high-voltage testing.

Kvtester Electronics Technology Co.,Ltd. is a high-tech enterprise specializing in power testing, testing, research and development, production, and sales of testing equipment. It has been engaged in the electrical testing industry for many years, and its products are of high quality. We welcome customers to come and purchase.