CN110111976B

CN110111976B - Oil-immersed transformer with elutriation and rejection functions at low temperature

Info

Publication number: CN110111976B
Application number: CN201910311806.5A
Authority: CN
Inventors: 魏伟健
Original assignee: Jiangsu Dingxin Electric Co
Current assignee: JIANGSU DINGXIN ELECTRIC Co.
Priority date: 2019-04-18
Filing date: 2019-04-18
Publication date: 2021-03-09
Anticipated expiration: 2039-04-18
Also published as: CN110111976A; CN112863819A

Abstract

The invention discloses an oil immersed transformer with a water separation and removal function at low temperature. Has the advantages that: the water through the sediment is adsorbed by the sand layer and the cotton layer, and the sand layer is different with the water and the different with the adsorption characteristic of oil and is effectively kept apart with bottom transformer oil, the brush hair strip carries out the back and forth scraping to the ropy transformer oil of electric coil bottom under the effect of rotary disk simultaneously, in order to realize that the electric coil bottom covers there is the transformer oil of great weight and this oil contains a large amount of moisture and rejects, thereby carry out the metal corrosion to it, and the metal salt ion that the corruption metal produced becomes the catalyst of transformer oil oxidation effect again, U type heat pipe produces the heat to the surrounding environment under the effect of heating, thereby make its temperature rise and carry out thermal evaporation treatment to the moisture that adsorbs via the cotton layer, because of its lower than the cotton layer 0.5cm of U type heat pipe, so give the cotton layer the saturated expanded space of absorbing water.

Description

Oil-immersed transformer with elutriation and rejection functions at low temperature

Technical Field

The invention relates to the field of transformers, in particular to an oil immersed transformer with a water separation and removal function at low temperature.

Background

For a large power plant, a main transformer, a service transformer, etc. with a large capacity and a high voltage class are regarded as core main equipment for power generation production, and are regarded as important in a series of operations such as operation, maintenance, and use, and the transformers are divided into: dry-type transformer, oil immersed transformer, wherein oil immersed transformer is then very popular, but the oil immersed transformer on the existing market has following shortcoming:

1. when the temperature of water dissolved in transformer oil is lower, the solubility of the transformer oil is reduced, the water is separated out due to the supersaturation of the water, so that large water drops are formed to be separated and deposited from the transformer oil, the specific gravity of the deposited water is higher than that of the transformer oil, the water content is higher, the metal corrosion reaction speed is higher, and metal salt ions generated by corrosion metal become a catalyst for the oxidation of the transformer oil.

2. And as the transformer operates in a low-temperature environment for a long time, the viscosity of the transformer oil is increased, a large amount of moisture is separated out, and with the increase of the moisture, the kinetic energy of water molecules is small, so that the water molecules are easily gathered in a gap between current bridge paper boards under a high strong electric field, the insulation paper is damaged, more moisture and limiting impurities are generated, the transformer oil is changed in quality, the moisture in the oil is oxidized with the insulation oil to form polymer organic acid, the metal in the transformer is corroded under the combined action of the polymer organic acid, the breakdown strength of the insulation of the oil paper is sharply reduced, and finally, an accident is caused.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide an oil-immersed transformer with a water precipitation removing function at low temperature, so as to solve the problems that the solubility of transformer oil is reduced when the temperature of water dissolved in the transformer oil is lower, the water is precipitated due to the supersaturation of the dissolution, large water drops are formed to be separated from the transformer oil and deposited, the specific gravity of the deposited water is higher than that of the transformer oil, the moisture content is high, the metal corrosion reaction speed is higher, metal salt ions generated by corrosion metal become a catalyst for the oxidation of the transformer oil, the viscosity of the transformer oil is increased and the moisture is precipitated in large quantity due to the long-term operation of the transformer in a low-temperature environment, the kinetic energy of water molecules is smaller, and the water molecules are easily accumulated in a high electric current bridge paperboard gap under a high field, so that the insulating paper is damaged and more moisture and limiting impurities are generated, therefore, the quality of the transformer oil is changed, and the moisture in the transformer oil and the insulating oil are oxidized to form high molecular organic acid which jointly acts to corrode metal in the transformer, so that the breakdown strength of the oil paper insulation is sharply reduced, and finally, the defect of an accident is caused.

In order to achieve the purpose, the invention is realized by the following technical scheme:

the utility model provides an oil-immersed transformer that has water and analyse function of rejecting during low temperature, its structure includes case shell, precipitation removing devices, electric coil, oil tank, heating panel, voltage apron, precipitation removing devices locates lower part in the case shell and is connected through the electric welding, the electric coil is located precipitation removing devices upper surface and is connected through the lock, the case shell inboard and integrated structure are located to the oil tank, the heating panel is equipped with a plurality of and is even equidistance form and installs in case shell front surface and be connected through the electric welding is perpendicular, the voltage apron is installed in case shell upper surface and is connected through the electric welding, precipitation removing devices is including rejecting board, electric digestion structure, scraping and collecting the mechanism, the electric digestion structure is located and is rejected inboard bottom and electricity and connect, it collects the mechanism and locates and rejects inboard middle part and be connected through the electric welding with the electric digestion structure to scrape.

According to a further scheme of the invention, the rejection plate comprises rectangular grooves, U-shaped buckle plates, surface layers, sand layers and cotton layers, the rectangular grooves are formed in the middle of the inside of the rejection plate and are of an integrated structure, the U-shaped buckle plates are provided with two U-shaped buckle plates, openings of the two U-shaped buckle plates are symmetrically arranged on the upper surfaces of the rectangular grooves, the U-shaped buckle plates are connected with the rectangular grooves through electric welding, the surface materials of the rejection plate respectively comprise the surface layers, the sand layers and the cotton layers from top to bottom, and concentrated adsorption on water deposited at the bottom at low temperature is favorably realized.

As a further scheme of the invention, the cotton layer is made of absorbent cotton material, which is beneficial to absorbing water.

As a further scheme of the present invention, the electric evaporation structure includes an electric element, two current-conducting plates and a U-shaped heat-conducting pipe, the electric element is electrically connected to the scraping mechanism, the two current-conducting plates are respectively installed on the left side and the right side of the electric element, the current-conducting plates are electrically connected to the electric element, the U-shaped heat-conducting pipe is provided with a plurality of pieces and is respectively installed on the upper surface of the current-conducting plate in a vertical manner, the U-shaped heat-conducting pipe is vertically connected to the current-conducting plates through electric welding, and the post-drying treatment of the absorbed.

As a further scheme of the invention, the height of the U-shaped heat conduction pipe is lower than that of the cotton layer by 0.5cm, so that the cotton layer is prevented from being damaged due to direct collision between the cotton layer and the U-shaped heat conduction pipe.

According to a further scheme of the invention, the scraping and collecting mechanism comprises an insulating sheath, a driving rod, a rotating disk, a plurality of brush strips and hollow holes, the lower end of the driving rod penetrates through the insulating sheath to be electrically connected with an electric element, the rotating disk is installed at the upper end of the driving rod and is connected with the upper end of the driving rod through electric welding, the plurality of brush strips are respectively installed on the upper surface of the rotating disk, the plurality of hollow holes are respectively arranged on the surface of the rotating disk, the hollow holes and the rotating disk are of an integrated structure, water absorption treatment on water adsorbed at the bottom of a current bridge is facilitated, and the phenomenon that oil at the bottom of the current bridge is increasingly viscous is avoided, so that the breakdown strength of the oiled.

As a further scheme of the invention, the brush hair strips are made of materials with strong water absorption, so that the brush hair strips are beneficial to realizing back-and-forth touch of the oiled paper at the bottom of the current bridge, and the moisture in the brush hair strips is adsorbed.

In a further aspect of the present invention, the rotating disc is made of a heat insulating material.

Advantageous effects of the invention

Compared with the traditional oil immersed transformer, the invention has the following beneficial effects:

the invention utilizes the arranged eliminating plate to adsorb the water deposited at the bottom through the sand layer and the cotton layer, thereby effectively isolating the water from the transformer oil at the bottom by utilizing the adsorption characteristics of the sand layer, the water and the oil, and simultaneously scraping the viscous transformer oil at the bottom of the electric coil back and forth through the brush bristle strip under the action of the rotating disk, so as to realize that the bottom of the electric coil is covered with the thicker transformer oil and the oil contains a large amount of water to be eliminated, thereby carrying out metal corrosion on the oil, and metal salt ions generated by corroding metals can become a catalyst for the oxidation of the transformer oil.

The invention utilizes the U-shaped heat conduction pipe to generate heat to the surrounding environment under the heating effect, so that the temperature of the U-shaped heat conduction pipe is increased, the heat evaporation treatment is carried out on the moisture absorbed by the cotton layer, and meanwhile, the U-shaped heat conduction pipe is lower than the cotton layer by 0.5cm, so that the U-shaped heat conduction pipe provides a space for the cotton layer to absorb water and expand in a saturated manner.

Drawings

Other features, objects and advantages of the invention will become more apparent from a reading of the detailed description of non-limiting embodiments with reference to the attached drawings.

In the drawings:

fig. 1 is a schematic structural diagram of an oil-immersed transformer with a elutriation and rejection function at a low temperature.

FIG. 2 is a front cut-away view of the water separation and removal device of the present invention.

FIG. 3 is a schematic top view of the water separation and removal device of the present invention.

Fig. 4 is a schematic top view of the conductive plate of the present invention.

Fig. 5 is a right side view structural view of the U-shaped heat pipe of the present invention.

In the figure: the device comprises a box shell-1, a water precipitation removing device-2, an electric coil-3, an oil tank-4, a heat dissipation plate-5, a voltage cover plate-6, a removing plate-20, an electric evaporation structure-21, a scraping mechanism-22, a rectangular groove-201, a U-shaped buckle plate-202, a surface layer-203, a sand layer-204, a cotton layer-205, an electric element-210, an electric conduction plate-211, a U-shaped heat conduction pipe-212, an insulating sheath-220, a driving rod-221, a rotating disk-222, a bristle bar-223 and a hollow hole-224.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 5, the present invention provides a technical solution of an oil-immersed transformer with a water separation and removal function at low temperature:

as shown in fig. 1-2, an oil-immersed transformer with a water separation and removal function at low temperature, the structure of the device comprises a box shell 1, a water separation eliminating device 2, an electric coil 3, an oil tank 4, a heat dissipation plate 5 and a voltage cover plate 6, the water separating and removing device 2 is arranged at the lower part in the case shell 1 and is connected with the case shell by electric welding, the electric coil 3 is arranged on the upper surface of the water separating and removing device 2 and is connected with the case shell by buckling, the oil tank 4 is arranged on the inner side of the case shell 1 and is of an integrated structure, the heat dissipation plates 5 are arranged on the front surface of the case shell 1 in an even and equidistant manner and are vertically connected through electric welding, the voltage cover plate 6 is arranged on the upper surface of the case shell 1 and is connected with the case shell by electric welding, the water separation and removal device 2 comprises a removal plate 20, an electric evaporation structure 21 and a scraping and collecting mechanism 22, the electric evaporation structure 21 is arranged at the bottom in the rejection plate 20 and is electrically connected, and the scraping mechanism 22 is arranged at the middle in the rejection plate 20 and is connected with the electric evaporation structure 21 through electric welding.

As shown in fig. 2-3, reject board 20 and include rectangle recess 201, U type buckle 202, surface course 203, husky layer 204, cotton layer 205, the middle part is equipped with rectangle recess 201 and is the integral structure in rejecting board 20, U type buckle 202 is equipped with two and the opening part is symmetry form respectively and installs in rectangle recess 201 upper surface, U type buckle 202 is connected through the electric welding with rectangle recess 201, reject board 20 surface material from last to down constitute by surface course 203, husky layer 204, cotton layer 205 respectively, be favorable to realizing depositing when low temperature and do concentrated absorption at bottom water.

As shown in fig. 2, the cotton layer 205 is absorbent cotton material, which is beneficial to absorbing water.

As shown in fig. 2, the evaporation structure 21 includes an electric element 210, two conductive plates 211, and a U-shaped heat pipe 212, the electric element 210 is electrically connected to the scraping mechanism 22, the two conductive plates 211 are provided in total and are respectively installed on the left and right sides of the electric element 210, the conductive plates 211 are electrically connected to the electric element 210, the U-shaped heat pipe 212 is provided with a plurality of pieces and is respectively installed on the upper surface of the conductive plate 211 in a vertical manner, and the U-shaped heat pipe 212 is vertically connected to the conductive plates 211 through electric welding, so as to perform a later-stage drying process on the absorbed water.

As shown in fig. 2 to 5, the height of the U-shaped heat conducting pipe 212 is 0.5cm lower than the height of the cotton layer 205, so as to prevent the cotton layer 205 from being damaged due to direct collision between the cotton layer 205 and the U-shaped heat conducting pipe 212.

As shown in fig. 2-3, the scraping and collecting mechanism 22 includes an insulating sheath 220, a driving rod 221, a rotating disk 222, bristle bars 223, and hollow holes 224, the lower end of the driving rod 221 penetrates through the insulating sheath 220 to be electrically connected with the electrical element 210, the rotating disk 222 is installed at the upper end of the driving rod 221 and connected with the driving rod 221 through electric welding, the bristle bars 223 are provided with a plurality of holes and are respectively installed on the upper surface of the rotating disk 222, the hollow holes 224 are respectively installed on the surface of the rotating disk 222, the hollow holes 224 and the rotating disk 222 are integrated, which is beneficial to performing water absorption treatment on water absorbed at the bottom of a current bridge, and preventing oil at the bottom of the current bridge from becoming more viscous, so that the breakdown strength of the oiled paper insulating structure is reduced.

As shown in fig. 2-3, the bristle strips 223 are made of a material with a strong water absorption property, which is beneficial to the fact that the oiled paper at the bottom of the current bridge is touched back and forth, so as to adsorb the moisture in the oiled paper.

As shown in fig. 2-3, the rotating disk 222 is made of a heat insulating material.

In summary, the moisture at the bottom of the sediment at low temperature is adsorbed by the removing plate 20, and the grease at the bottom of the current bridge is scraped by the scraping mechanism 22, so that the moisture contained in the sediment is adsorbed, and the moisture collected by the removing plate 20 and the scraping mechanism 22 is evaporated under the action of the scraping mechanism 21.

The specific realization principle is as follows: the transformer oil is filled in the oil tank 4 to insulate and protect the electric coil 3, the electric coil 3 is placed on the rectangular groove 201 and is buckled and fixed through the U-shaped buckle plate 202, when the operation temperature in the tank shell 1 is lower, the solubility of the transformer oil of water dissolved in the transformer oil is reduced when the temperature is lower, the water is separated out due to the supersaturation of the water, so that large water drops are formed to be separated and deposited from the transformer oil, the deposited water is heavier than the transformer oil and is deposited at the bottom of the transformer, the viscosity of the transformer oil is increased due to the long-term operation of the transformer in a low-temperature environment, a large amount of water is separated out, along with the large increase of the water, the kinetic energy of water molecules is smaller, the water molecules are easily gathered under a high-intensity electric field in a gap between current bridge paper plates, so that the insulating paper is damaged, more water and limiting impurities are generated, and the quality, and the water in the oil can also be oxidized with the insulating oil to form polymer organic acid to corrode the metal in the transformer under the combined action, so that the breakdown strength of the oil paper insulation is reduced rapidly, and finally an accident is caused, therefore, the water precipitated in the box shell 1 is absorbed concentratedly by the water precipitation removing device 2, the water precipitated from the transformer oil is precipitated at the bottom of the equipment under the low-temperature operation, as sand has good water absorption and heat insulation for the water, the water permeates into the sand layer 204 through the surface layer 203, the water absorption of the cotton layer 205 is stronger than that of the sand layer 204, the water absorbed by the sand layer 204 is absorbed again by the cotton layer 205, the driving rod 221 connected with the electric element 210 by electrifying is rotated under the action of the electric element 210, so that the rotating disc 222 connected with the driving rod is rotated, the brush strip 223 arranged on the surface of the rotating disc 222 is rotated to scrape the transformer oil adhered to the bottom of the electric coil 3 back and forth, therefore, the cleaning of the viscous transformer oil at the bottom of the transformer oil is realized, so that the phenomenon that a large amount of moisture contained in the viscous transformer oil at the bottom of the transformer oil corrodes metal is avoided, meanwhile, the conducting plate 211 connected with the electric element 210 generates electric power under the action of the conducting plate 211, so that the U-shaped heat pipe 212 is heated to generate heat, the heat cannot directly contact with the cotton layer 205 to damage the cotton layer 205 because the distance between the U-shaped heat pipe 212 and the cotton layer 205 is 0.5cm, the moisture absorbed by the cotton layer 205 is gradually evaporated under the action of the surrounding heat, the moisture treatment is realized, and the transformer oil in the oil tank 4 cannot be influenced by the heat generated by the U-shaped heat pipe 212 because the sand layer 204 has good heat insulation property.

The invention solves the problems that the water dissolved in the transformer oil in the prior art is dissolved in the transformer oil at a lower temperature, the solubility of the transformer oil is reduced, the water is separated out due to the dissolution supersaturation, thereby forming large water drops separated from the transformer oil and depositing, the specific gravity of the deposited water is larger than that of the transformer oil, the moisture content is large, the metal corrosion reaction speed is higher, metal salt ions generated by corrosion metal become a catalyst for the oxidation of the transformer oil, the viscosity of the transformer oil is increased due to the long-term operation of the transformer in a low-temperature environment, the moisture is separated out in a large amount, the kinetic energy of water molecules is smaller along with the large increase of the moisture, the water molecules are easy to gather in a high-intensity electric field in a gap between current bridge paper boards, thereby damaging insulating paper and generating more moisture and limiting impurities, the quality change of the transformer oil is caused, and the moisture in the oil can also be oxidized with the insulating oil to form a high molecular organic acid to, the invention utilizes the arranged rejection plate to absorb the water deposited at the bottom through the sand layer and the cotton layer, thereby effectively isolating the water from the transformer oil at the bottom by utilizing the absorption characteristics of the sand layer, the water and the oil, and simultaneously utilizes the brush hair strip to scrape the viscous transformer oil at the bottom of the electric coil back and forth under the action of the rotating disk, so as to realize that the thick transformer oil is covered at the bottom of the electric coil and a large amount of water is contained in the transformer oil to be rejected, thereby carrying out metal corrosion on the transformer oil, metal salt ions generated by corroding metal can become a catalyst for the oxidation of the transformer oil, and the U-shaped heat conduction pipe generates heat to the surrounding environment under the heating action to increase the temperature of the transformer oil, thereby carrying out heat evaporation treatment on the water absorbed by the cotton layer, meanwhile, the U-shaped heat conduction pipe is lower than the cotton layer by 0.5cm, so that the cotton layer is provided with a space for water absorption saturation expansion.

While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides an oil-immersed transformer that has water when low temperature and analyse and reject function, its structure includes case shell (1), separates water and rejects device (2), electric coil (3), oil tank (4), heating panel (5), voltage apron (6), its characterized in that: the water separating and removing device (2) is arranged at the inner lower part of the case shell (1) and is connected with the water separating and removing device through electric welding, the electric coil (3) is arranged on the upper surface of the water separating and removing device (2) and is connected with the water separating and removing device through buckling, the oil tank (4) is arranged on the inner side of the case shell (1) and is of an integrated structure, the heat dissipation plate (5) is provided with a plurality of heat dissipation plates which are uniformly arranged on the front surface of the case shell (1) at equal intervals and are vertically connected with the water separating and removing device through electric welding, and the voltage cover plate (6;

precipitation removing devices (2) are including rejecting board (20), electricity digestion structure (21), scrape a set mechanism (22), electricity digestion structure (21) are located and are rejected bottom and electricity in board (20) and connect, scrape a set mechanism (22) and locate in rejecting board (20) middle part and be connected through the electric welding with electricity digestion structure (21), reject board (20) including rectangle recess (201), U type buckle (202), surface course (203), sand bed (204), cotton layer (205), it is equipped with rectangle recess (201) and structure as an organic whole to reject in board (20) middle part, U type buckle (202) are equipped with two and opening part and are symmetry form respectively and install in rectangle recess (201) upper surface, U type buckle (202) are connected through the electric welding with rectangle recess (201), reject board (20) surface material from last to down by surface course (203) respectively, A sand layer (204) and a cotton layer (205);

the cotton layer (205) is made of absorbent cotton, the electric evaporation structure (21) comprises an electric element (210), an electric conduction plate (211) and a U-shaped heat conduction pipe (212), the electric element (210) is electrically connected with the scraping mechanism (22), the electric conduction plate (211) is provided with two electric conduction plates which are respectively arranged on the left side and the right side of the electric element (210), the electric conduction plate (211) is electrically connected with the electric element (210), the U-shaped heat conduction pipe (212) is provided with a plurality of electric conduction plates which are respectively vertically arranged on the upper surface of the electric conduction plate (211), and the U-shaped heat conduction pipe (212) is vertically connected with the electric conduction plate (211) through electric welding;

scrape an album mechanism (22) and include insulating sheath (220), actuating lever (221), rotary disk (222), brush hair strip (223), fretwork hole (224), actuating lever (221) lower extreme passes insulating sheath (220) and is connected with electric element (210) electricity, rotary disk (222) installation is connected with actuating lever (221) upper end and through the electric welding, brush hair strip (223) are equipped with a plurality of and install respectively in rotary disk (222) upper surface, fretwork hole (224) are equipped with a plurality of and locate rotary disk (222) surface respectively, fretwork hole (224) and rotary disk (222) structure as an organic whole.