A pressure gel forming method for zero partial discharge voltage transformer

Abstract

The invention discloses a zero-partial discharge pressure gel forming method for a potential transformer, and belongs to the technical field of electrical manufacturing and electrical equipment. The method has the following advantages that the labor intensity of workers is lowered obviously; production efficiency is improved, and mold cycling time is shortened; the number of air gaps can be decreased by the way that a pressure gel mold is filled with SF6 gas after being vacuumized, the partial discharge performance of the product can be improved obviously, and the partial discharge is zero under a 14.4 kV standard specified voltage; the appearance quality of the potential transformer is improved, due to the fact that the pressure of 0.25-0.35 MPa needs to be applied to the product in the pressure gel forming process, the dimension is decreased after demolding is conducted, and the mold joint of the mold and the appearance glossiness of the product are improved obviously; (5) the toughness and the crack resistance of the product are improved, activated silica powder and an epoxy resin system have good compatibility, a stepped temperature rising and temperature dropping mode is adopted at the later solidification stage, and inside or outside cracking of the product due to sudden temperature dropping can be prevented.

Description

technical field [0001] The invention specifically relates to a pressure gel forming method for a zero partial discharge voltage transformer, which belongs to the technical field of electrical manufacturing and electrical equipment. Background technique [0002] 10kV castable voltage transformer is widely used in switchgear and other electrical equipment, and is an important measurement and protection product. At present, the vacuum casting process is mainly used in China to produce 10kV castable voltage transformers, while the pressure gel process is mainly used abroad to produce 10kV castable voltage transformers. No matter which production process is used, for the production of voltage transformers, the most important thing is to control the partial discharge level within the range required by the national standard. Of course, a lower partial discharge level is more conducive to the long-term stable use of the transformer. [0003] At present, most of the companies that u...

AI Technical Summary

Problems solved by technology

However, there are also the following disadvantages: the pressure gel mold is installed in a vacuum tank. In order to adapt to molds of different sizes, the vacuum tank must have a large internal space, but too large internal space will obviously prolong the vacuuming time and affect production efficiency. At the same time, it is difficult to observe the overflow of the mold during injection and pressure-holding molding, which is not conducive to process control; at the same time, it does not mention the performance of the voltage transformer produced by this method, especially the partial discharge performance, and it is not limited Properties of epoxy resin materials critical for pressure gel production of transformers

However, the pre-baking process of the body is relatively complicated, the operation time is long, the production efficiency is low, and the partial discharge level needs to be controlled