CN202473505U

CN202473505U - Device for charging dry air into transformer under negative pressure

Info

Publication number: CN202473505U
Application number: CN 201120540611
Authority: CN
Inventors: 韩志伟; 燕飞东; 谢辉; 孙莲
Original assignee: Shandong Power Equipment Co Ltd
Current assignee: Shandong Power Equipment Co Ltd
Priority date: 2011-12-21
Filing date: 2011-12-21
Publication date: 2012-10-03
Anticipated expiration: 2021-12-21

Abstract

The utility model discloses a device for charging dry air into a transformer under a negative pressure. Compressed air from an air compressor enters an air storage tank, then is filtered through a filter and dried in a drying machine; then the dried compressed air is charged into the transformer under the negative pressure. The device is characterized in that an automatic pressure maintaining device is connected between the drying machine and the transformer and is used for automatically controlling the supplying flow of the drying machine, so that the supplying flow of the drying machine and the air supply capacity of the air compressor are balanced and the drying machine always works at a rated pressure, and the requirement of the transformer for negative pressure air charging is met. By controlling the working pressure of the drying machine, the device conveniently and perfectly solves the problem that the drying machine cannot work normally when the transformer is charged with air under the negative pressure. By the device, an air charging system is improved, and on the premise that the air supply is not shut off, the pressure of the drying machine can always operate at the set pressure; and the operating pressure can be randomly set according to actual needs, and once the pressure value is set, the system can automatically operate under variable working conditions without manual adjustment.

Description

The transformer negative pressure is filled the device of dry air

Technical field

The utility model relates to the power transformer industry, and especially the transformer negative pressure is filled the device of dry air.

Background technology

Present depth drying air principle is the malleation absorption type, and promptly drying machine must move under the malleation operating mode; And the transformer gas filling technology requires under the negative pressure operating mode, to carry out.In actual inflation work; Vacuum adsorption force that the negative pressure operating mode of transformer produces caused drying machine can not be normally, the problem of even running; Be embodied in: in the inflation starting stage; Vacuum adsorption force in the transformer has surpassed the gas supply capacity of air compressor machine, causes drying machine to move at subnormal pressure even under the negative pressure operating mode, and drying machine absorption work can not normally be carried out; To the inflation stage casing, along with the transformer internal pressure raises, its vacuum adsorption force to drying machine descends, and the operating pressure of drying machine progressively raises, and the drying machine adsorption function progressively recovers; Inflation work latter stage, the vacuum suction in the transformer reaches balance with the gas supply capacity of air compressor machine, and drying machine is able under nominal situation, move.

Current drying machine producer and other transformer producers are that to address this problem the method for taking all be to increase the air compressor machine gas supply capacity; When having solved drying machine cisco unity malfunction problem, produced new problem again: caused air-pressure equipment obviously to exceed the normal demand of corresponding transformer on the one hand; It is low load with strong power; And need set up air accumulator, when increasing investment and operating cost, be unfavorable for that also mobile device is to other workplaces easily; On the other hand, the increase of gas supply capacity causes inflating the big flow attack problem that vacuum adsorption force causes in the work initial stage transformer and more aggravates.The solution of the increase gas supply capacity that present other producers take is not touched the basic of gas filling technology even running demand.

Part import drying machine producer is provided with pressure protection valve in outlet, when low pressure, closes automatically, though this can play a protective role to drying machine, the frequent start-stop phenomenon can occur.

Transformer must fill dry air under vacuum state, and the design of dry air system is normal pressure inflation design, therefore problems such as flow shakiness, drier frequent start-stop can occur.

Summary of the invention

The utility model technical problem to be solved is how to guarantee that under the situation that guarantees the inflation of transformer negative pressure drying machine works normally.

For addressing the above problem, the utility model provides a kind of transformer negative pressure to fill the device of dry air, and the compressed air that air compressor machine is got gets into air accumulator; It is dry after filter filters, to get into drying machine, and negative pressure charges into transformer then, between drying machine and transformer, inserts automatic pressurizer; Be used for controlling automatically the flow of confessing of drying machine; Make the gas supply capacity balance of itself and air compressor machine, drying machine is worked under rated pressure all the time, satisfy the needs of transformer negative pressure inflation simultaneously.

The utility model is through controlling the operating pressure of drying machine, problem convenient, drying machine irregular working when ideally having solved the inflation of transformer negative pressure.Perfect gas charging system under the prerequisite that has nothing to do with cut-off gas, can guarantee that the pressure of drying machine maintains the operation of setting pressure operating mode all the time, and operating pressure can be set arbitrarily according to actual needs.In case after configuring force value, system can need not artificial adjusting at fully automatic operation under the variable working condition.

Description of drawings

Fig. 1 is the flow chart of the utility model.

Embodiment

As shown in Figure 1, the compressed air that air compressor machine is got gets into air accumulator, and it is dry after filter filters, to get into drying machine, carries out getting into transformer after pressure is regulated through automatic pressurizer then.Automatically pressurizer is controlled by control program; Through drying machine operating pressure index; Automatically the control drying machine confess flow, make the gas supply capacity balance of itself and air compressor machine, drying machine is worked under rated pressure all the time; Thereby guaranteed its operate as normal, eliminated the big flow attack problem at transformer inflation work initial stage simultaneously automatically.

Though the utility model discloses as above with preferred embodiment; Right its is not in order to limit the utility model; Under the situation that does not deviate from the utility model spirit and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the utility model.

Claims

1. a transformer negative pressure is filled the device of dry air, and the compressed air that air compressor machine is got gets into air accumulator, filters the back through filter and gets into the drying machine drying; Negative pressure charges into transformer then; It is characterized in that: between drying machine and transformer, insert automatic pressurizer, be used for controlling automatically the flow of confessing of drying machine, make the gas supply capacity balance of itself and air compressor machine; Drying machine is worked under rated pressure all the time, satisfy the needs of transformer negative pressure inflation simultaneously.