Main transformer nitrogen protection breather and application method thereof

Abstract

The invention relates to a main transformer nitrogen protection breather and an application method thereof. The main transformer nitrogen protection breather comprises a main transformer body and a control device, wherein the main transformer body is connected to the bottom of an oil conservator by an oil conservator connecting pipe, a gas relay is installed on the oil conservator connecting pipe, the top of the oil conservator is connected to one end of a breathing nitrogen groove by a breathing pipe, an air supplement electromagnetic valve is arranged at the other end of the breathing nitrogen groove and connected to the air outlet of a high-purity nitrogen supplement device, and a reducing valve is arranged at the air outlet of the high-purity nitrogen supplementary device; the control device comprises a central control module, a pressure sensor electrically connected with the central control module and arranged at the oil conservator for detecting air pressure in the oil conservator, a pressure release valve arranged on the top of the oil conservator, and the gas supplement electromagnetic valve. The main transformer nitrogen protection breather can ensure respiration, and also can isolate contact of air and moisture with the oil level in the main transformer, thus ensuring that transformer oil in the main transformer is stable and good in quality for a long time, and also being capable of providing effective fireproofing and firefighting effect.

Description

technical field [0001] The invention relates to the field of sealing protective breathing for high-voltage oil-filled main transformers of electric power, in particular to a nitrogen protective breathing device for main transformers and a method for using the same. Background technique [0002] The protective breathing devices of traditional high-voltage oil-filled main transformers are mainly metal corrugated expander protective devices, flexible capsule protective devices, or directly installing a moisture absorber at the lower end of the main transformer oil pillow breathing tube to communicate directly with the atmosphere. The metal corrugated expander is used to protect the breathing device, and the stretching or contraction of the metal corrugated expander is used to compensate the pressure change inside the main transformer caused by the rise and fall of the oil level in the main transformer due to the thermal expansion and cold contraction of the oil. The metal corr...

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Problems solved by technology

The metal corrugated expander is used to protect the breathing device, and the stretching or contraction of the metal corrugated expander is used to compensate the pressure change inside the main transformer caused by the rise and fall of the oil level in the main transformer due to the thermal expansion and cold contraction of the oil. The metal corrugated expander is made of stainless steel metal. Due to the effect of friction during stretching and contraction, it is easy to cause jamming and suffocation, which will cause the oil level of the main transformer to rise and fall smoothly, and also cause fake oil in the oil-filled main transformer. The flexible capsule protection device also has the above problems, and because the rubber capsule will age after a long time of use, it is easy to contaminate oil products; the breathing method of directly installing a moisture absorber at the lower end of the main transformer oil pillow breathing tube only relies on the moisture absorber part Adsorb and inhale the moisture, moisture and impurities entrained in the atmosphere, making it easier to make the oil in the main transformer oil conservator damp, polluted and deteriorated

The above traditional methods, the use of metal corrugated expander protection device and flexible capsule protection device are prone to jamming, resulting in poor breathing of the oil level of the main transformer, and false oil level of the oil-filled main transformer. There are serious safety hazards such as gas suffocation, heavy tile tripping, and even explosion of the main transformer, and the oil surface of the main transformer oil conservator is in contact with air for a long time and is also susceptible to moisture, oxidation and pollution

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