Novel method and equipment for breaking vacuum of vapor phase drying chamber

Abstract

The invention discloses a novel method and equipment for breaking the vacuum of a vapor phase drying chamber. The method comprises the following steps of: before vacuum breaking, starting an air compressor in advance, opening an air inlet valve of a drying machine and starting the drying machine, wherein compressed air output by the drying machine is adjusted by using a reducing valve until the pressure of a low-pressure side is 1 bar; during vacuum breaking, opening a vacuum breaking valve of the drying chamber in advance and opening an adjusting valve to break vacuum; continuously detecting the pressure in the chamber by using a pressure transmitter connected with the drying chamber, closing the adjusting valve through a process controller by using the pressure transmitter when the pressure in the drying chamber is up to one standard atmospheric pressure, and ending vacuum breaking; and keeping an atmosphere vacuum breaking device serving as an auxiliary vacuum breaking device. By adopting the method and equipment, moisture absorption of an insulating part of the transformer can be effectively avoided or reduced in the vacuum breaking process, the vacuum breaking speed is high, the time is constant, the influence of external air is avoided, and the insulating performance and quality of the insulating part of the transformer are ensured.

Description

technical field [0001] The invention belongs to the field of transformer production and manufacturing, and specifically relates to vapor-phase drying of insulating parts of transformer bodies, a treatment method and equipment after drying of transformer bodies, and is especially suitable for drying after drying of 1000kV ultra-high voltage products and converter bodies. Can emptying method and equipment. Background technique [0002] After the transformer body is assembled, there will be 4% to 8% moisture in the insulating parts of the body even in the factory environment of constant temperature and humidity. It is required to improve the reliability of the transformer so that it has good working performance and long service life. Only through drying treatment can the moisture content of the insulating material be reduced to 0.5% to 0.1%. [0003] Prior to this, in order to ensure the dry quality of transformer body insulation parts, transformer manufacturers at home and ab...

AI Technical Summary

Problems solved by technology

[0005] 1. The moisture in the air filled in the drying tank cannot be effectively removed, so that the dry insulating parts of the body at the end of drying will absorb moisture for the second time, thereby affecting its insulation performance

[0006] 2. The air breaking time of the atmospheric breaking method is longer (about 40 minutes), which is equivalent to prolonging the time of breaking the insulating parts of the body and increasing the risk of secondary moisture absorption of the insulating parts, especially for 1000kV UHV product or rheological product impact is greater

[0007] 3. After the air filter is repeatedly used, it will prolong the emptying time of the drying tank due to its clogging

[0008] 4. Since the air is filled into the drying tank, the local air quality (humidity, clean) at that time seriously affects the quality of the gas filled

Images