• Shandong Liaocheng High tech Industrial Development Zone

Customized processing of oil-immersed transformers

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Product description

The process of oil-immersed transformer inspection can be energized, in other words, oil-immersed transformer inspection does not need to be powered off. The technologies and key methods that need to be paid attention to in the live detection of oil-immersed transformers are as follows, let’s understand and take a look at it in detail with you:

Customized processing of oil-immersed transformers

First of all, let’s explain what is the reason for partial discharge of oil-immersed transformers? In fact, the fundamental reason is that the internal insulation of oil-immersed transformers, transformers and some other high-voltage electrical equipment is discharged under the action of high voltage. However, this kind of layout discharge only exists in part of the insulation, and will not immediately produce the entire insulation penetration penetration or flashover, so this will be called partial discharge. The partial discharge of the oil-immersed transformer is very weak, and it is not perceptible to it at all by human intuition, because only the highly sensitive partial discharge detection instrument can detect it.

2. The internal insulation of the oil-immersed transformer in operation is under the action of the working voltage for a long time, especially with the improvement of the voltage level, the field strength value of the insulation is very high, and the insulation weakness of the oil-immersed transformer is easy to produce partial discharge, and the reasons for partial discharge are usually:

How can the oil-immersed transformer produce partial discharge, and its detection method

1. The oil contains water, gas and floating particles;

The electric field is too concentrated at a certain point, or the field strength at a certain point is too large, such as bubbles in solid substances, and impurities are not removed;

In different combinations of matter, there is a strong distortion of the electric field at the page. Traces of partial discharge often leave only a small spot, or dendritic burn mark, on the solid insulation. In the oil, some decomposed bubbles appear.

Although the partial discharge time is short, the kinetic energy is also very small, but it has a certain degree of harmfulness, it will have a greater damage effect on the insulating material for a long time, one is to make the adjacent partial discharge of the insulating material, suffer from the direct transition of the discharge particle point resulting in the destruction of part of the insulation, the second is the chemical effect of heat, ozone, nitrogen oxide and other active gases produced by the discharge, so that part of the insulation suffers from erosion and aging, and the conductivity is improved, resulting in thermal breakdown. In the operation of oil-immersed transformers, the internal insulation aging and damage are mostly started from partial discharge.