CN108630401B - Oil filtering method of oil filter based on partial replacement of original transformer oil by synthetic ester oil - Google Patents
Oil filtering method of oil filter based on partial replacement of original transformer oil by synthetic ester oil Download PDFInfo
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- CN108630401B CN108630401B CN201810327858.7A CN201810327858A CN108630401B CN 108630401 B CN108630401 B CN 108630401B CN 201810327858 A CN201810327858 A CN 201810327858A CN 108630401 B CN108630401 B CN 108630401B
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- oil
- transformer
- synthetic ester
- filter
- oil filter
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- 239000003921 oil Substances 0.000 title claims abstract description 150
- 239000010696 ester oil Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000001914 filtration Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 17
- 239000002699 waste material Substances 0.000 claims abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 7
- 238000009413 insulation Methods 0.000 abstract description 6
- 239000011087 paperboard Substances 0.000 abstract description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 4
- 239000011707 mineral Substances 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 239000002480 mineral oil Substances 0.000 description 4
- 235000010446 mineral oil Nutrition 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
Abstract
The invention discloses an oil filtering method of an oil filter based on partial replacement of original transformer oil by synthetic ester oil, which comprises the following steps: the first stage is as follows: the oil filter pumps original insulating oil in the transformer into the oil filter through a pipeline, directly introduces the original mineral insulating oil into a waste oil tank, then introduces synthetic ester oil into the oil filter, introduces the synthetic ester oil into the transformer through normal oil pressure, and continues the process until the ratio of the synthetic ester oil to the total oil mass in the transformer reaches a preset value; and a second stage: the mixed transformer oil in the transformer is communicated with an oil filter in a time-sharing mode through an oil inlet and outlet pipeline, a dewatering and filtering process is completed inside the oil filter, and the process is continued until the monitoring of micro water in the transformer oil reaches standard requirements. The invention can obviously improve the insulation recovery efficiency of the oil filter to the transformer, and reduce the water content in the insulating paper board to a greater extent, so that the total water content in the transformer is reduced to a safer level.
Description
Technical Field
The invention relates to the field of operation and maintenance of power enterprises and power equipment, in particular to the field of state overhaul and maintenance of transformers.
Background
Most of power transformers in operation in China are oil-immersed transformers, and certain potential safety hazards may exist in the operation of the power transformers along with the problems of operation age, manufacturing process, working environment and the like, for example, water and gas exchange is performed between the transformers inside the transformers and the external environment, discharge is generated due to overhigh local temperature in the transformers, insulating oil is aged and degraded under the action of various fields, impurities are generated, aged water is generated, and the like. The moisture increase, whether due to manufacturing processes or operating conditions, can cause the transformer to become wet, thereby compromising its operational safety and longevity.
Aiming at the problems of possible damping of the transformer and the like, the insulation recovery operation can be performed on the transformer by using an oil filter at present. However, the existing oil filtering method is only to treat the transformer on the basis of the original transformer, the effect of filtering water depends on the oil filtering time and temperature to a great extent, and the insulation recovery effect of the oil filter on the transformer is difficult to reach an ideal state in a short time due to the problems of the migration degree of water, the migration rate of water and the solubility of water in oil in insulating oil and insulating paper boards.
Disclosure of Invention
The invention aims to provide an oil filtering method of an oil filter based on partial replacement of crude transformer oil by synthetic ester oil, so as to solve the technical problem.
In order to achieve the purpose, the invention adopts the following technical scheme:
an oil filtering method of an oil filter based on partial replacement of crude transformer oil by synthetic ester oil comprises the following steps:
the first stage is as follows: the oil filter pumps original insulating oil in the transformer into the oil filter through a pipeline, directly introduces the original mineral insulating oil into a waste oil tank, then introduces synthetic ester oil into the oil filter, introduces the synthetic ester oil into the transformer through normal oil pressure, and continues the process until the ratio of the synthetic ester oil to the total oil mass in the transformer reaches a preset value;
and a second stage: the mixed transformer oil in the transformer is communicated with an oil filter in a time-sharing mode through an oil inlet and outlet pipeline, a dewatering and filtering process is completed inside the oil filter, and the process is continued until the monitoring of micro water in the transformer oil reaches standard requirements.
Furthermore, after the filtered oil reaches the standard, the mixed oil in the transformer is replaced by the original insulating oil of the transformer by using an oil filter or other means.
Further, the synthetic ester oil has a water solubility greater than the water solubility of the original insulating oil in the transformer.
Furthermore, the volume ratio of the synthetic ester oil in the transformer to the total oil amount is controlled to be 10-70% in the first stage.
Furthermore, in the second stage, the temperature in the vacuum cavity in the oil filter is controlled to be 5-6 ℃ higher than the oil temperature of the transformer.
Further, in the second stage, the temperature in the vacuum chamber in the oil filter is less than or equal to 80 ℃.
The invention relates to an oil filtering method of an oil filter based on a substitute synthetic ester oil. The working procedure of the oil filter is controlled by a single chip microcomputer program, the insulating oil part in the original transformer is replaced by new synthetic ester oil meeting the insulating oil standard, water in a paperboard in the transformer is more thoroughly and uniformly transferred into mixed oil in the normal cycle work of the oil filter, so that the insulating recovery effect is achieved, and finally, after the oil filter is finished, the mixed oil is replaced by the original transformer oil with the same specification, so that the purpose of not changing the original running condition of the transformer is achieved.
Compared with the prior art, the invention has the following beneficial effects:
(1) compared with the oil filtering method of the traditional oil filter, the invention can obviously improve the insulation recovery efficiency of the oil filter to the transformer, and reduce the water content in the insulating paper board to a greater extent, so that the total water content in the transformer is reduced to a safer level.
(2) The invention can prolong the residual service life of the transformer and improve the economic value of the transformer.
(3) The invention has wide application range and strong portability, does not change the original operating environment of the transformer, and is suitable for transformers with various voltage grades.
Drawings
FIG. 1 is a schematic diagram of a system for oil filtering of an oil filter with synthetic ester oil partially replacing primary transformer oil;
FIG. 2 is a graph comparing the breakdown voltage and water content of synthetic ester oil with silicone oil and mineral oil at 20 ℃.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1, the invention discloses an oil filtering method of an oil filter based on partial replacement of original transformer oil by synthetic ester oil, wherein the oil filter is connected with a transformer body, the oil filter is connected with a synthetic ester oil tank through a one-way pipe, and the oil filter is simultaneously connected with a waste oil tank through a one-way pipe.
The oil quantity in the synthetic ester oil storage tank is ensured to be sufficient, and the original insulating oil can be replaced. Starting the oil filter according to the operating rules of the oil filter, wherein the whole oil filtering process is divided into two stages, the first stage is a replacement process, and the second stage is an oil filtering process. In the first stage, the oil filter pumps original insulating oil in the transformer into the oil filter through a pipeline, the original mineral insulating oil is directly introduced into a waste oil tank through a program control electromagnetic valve switch, then the synthetic ester oil is introduced into the oil filter from the tank, the synthetic ester oil is introduced into the transformer through normal oil pressure, and the process is continued until the ratio of the synthetic ester oil to the total oil mass in the transformer reaches a preset value. The second process is the traditional oil filtering process of the oil filter, namely the mixed transformer oil in the transformer is communicated with the oil filter in a time-sharing way through an oil inlet and outlet pipeline, the dewatering and filtering process is completed in the oil filter, and the process is continued until the monitoring of the micro water in the oil in the transformer reaches the national standard. After the filtered oil reaches the standard, the mixed oil in the transformer is replaced by the original insulating oil of the transformer by using an oil filter or other means, thereby achieving the purpose of not changing the operation condition of the transformer.
Two points of attention in the present invention:
(1) the percentage of the part of original insulating oil of the transformer, which needs to be replaced by synthetic ester oil, in the total oil quantity of the transformer cannot threaten the safe operation of the transformer, and experimental research shows that the percentage is in a safe range within a range of 10-70% according to the degradation degree of the original insulating oil of the transformer, and the more serious the degradation of the original insulating oil of the transformer is, the higher the percentage corresponding ratio is;
(2) the water solubility of the synthetic ester oil is high, so that the temperature control in the vacuum cavity is improved, and the temperature rise is not obvious to the aging of the silicone oil and the common mineral insulating oil in a certain range, so that the temperature in the vacuum cavity is properly increased by 5-6 ℃ but is not more than 80 ℃.
The technical scheme of the invention is characterized in that:
(1) by using synthetic ester oil which has a much higher water solubility than common mineral oil, the water in the insulating paper board can be transferred to the oil to a greater extent and filtered out by mixing the synthetic ester oil with the mineral oil.
(2) The transformer is subjected to insulation recovery operations such as water removal and impurity removal of the oil filter, so that the whole service life of the transformer is prolonged to a certain extent, and better economic benefit is obtained.
(3) The synthetic ester oil is more environment-friendly than the traditional mineral oil, meets the development requirement of green economy, and can improve the insulation recovery level of the transformer and ensure the service life of the transformer under more economical and safe conditions by adopting a method of mixing the synthetic ester oil and the synthetic ester oil in a certain proportion under the condition of higher price at present.
Claims (5)
1. An oil filtering method of an oil filter based on partial replacement of crude transformer oil by synthetic ester oil is characterized by comprising the following steps:
the first stage is as follows: the oil filter pumps the original transformer oil in the transformer into the oil filter through a pipeline, directly introduces part of the original transformer oil into a waste oil tank, then introduces the synthetic ester oil into the oil filter, introduces the synthetic ester oil into the transformer through normal oil pressure, and continues the process until the ratio of the synthetic ester oil to the total oil mass in the transformer reaches a preset value;
and a second stage: the method comprises the following steps of communicating mixed transformer oil in a transformer with an oil filter in a time-sharing manner through an oil inlet and outlet pipeline, and finishing a dewatering and filtering process in the oil filter, wherein the process is continued until micro water in the oil in the transformer is monitored to meet standard requirements;
after the filtered oil reaches the standard, the mixed oil in the transformer is replaced by the original transformer oil of the transformer by using an oil filter or other means.
2. An oil filtration process for an oil filter based on the partial replacement of crude transformer oil by synthetic ester oil according to claim 1, characterized in that the synthetic ester oil has a water solubility which is higher than the water solubility of crude transformer oil in the transformer.
3. The oil filtering method of the oil filter based on partial replacement of crude transformer oil by synthetic ester oil according to claim 1, wherein the synthetic ester oil in the transformer is controlled to be 10-70% of the total oil volume in the first stage.
4. The oil filtering method of the oil filter based on the partial replacement of crude transformer oil by synthetic ester oil according to claim 1, characterized in that in the second stage, the temperature in the vacuum chamber of the oil filter is controlled to be 5-6 ℃ higher than the temperature of the transformer oil.
5. An oil filtering method for an oil filter based on partial replacement of crude transformer oil by synthetic ester oil according to claim 4, characterized in that in the second stage the temperature in the vacuum chamber in the oil filter is less than or equal to 80 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810327858.7A CN108630401B (en) | 2018-04-12 | 2018-04-12 | Oil filtering method of oil filter based on partial replacement of original transformer oil by synthetic ester oil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810327858.7A CN108630401B (en) | 2018-04-12 | 2018-04-12 | Oil filtering method of oil filter based on partial replacement of original transformer oil by synthetic ester oil |
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| Publication Number | Publication Date |
|---|---|
| CN108630401A CN108630401A (en) | 2018-10-09 |
| CN108630401B true CN108630401B (en) | 2020-05-22 |
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| CN201810327858.7A Active CN108630401B (en) | 2018-04-12 | 2018-04-12 | Oil filtering method of oil filter based on partial replacement of original transformer oil by synthetic ester oil |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109448962A (en) * | 2018-12-04 | 2019-03-08 | 国网浙江省电力有限公司电力科学研究院 | Transformer oil paper insulation model insulation performance recovery system and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5295099A (en) * | 1976-02-04 | 1977-08-10 | Nissin Electric Co Ltd | Method of refining orthophosphoric acid ester oil for electric insulation |
| CN1961383A (en) * | 2004-05-28 | 2007-05-09 | 阿雷瓦T&D股份有限公司 | High performance dielectric oil and the use thereof in high voltage electrical equipment |
| JP2012023262A (en) * | 2010-07-16 | 2012-02-02 | Aichi Electric Co Ltd | Drying method of oil-filled electric apparatus |
| CN202405055U (en) * | 2012-01-01 | 2012-08-29 | 长春工程学院 | Oil replacement device for oil immersed power transformer |
| CN102908989A (en) * | 2012-09-29 | 2013-02-06 | 西安热工研究院有限公司 | High-performance microporous adsorbent for regeneration treatment of oil used in electric power industry, and preparation method of high-performance microporous adsorbent |
-
2018
- 2018-04-12 CN CN201810327858.7A patent/CN108630401B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5295099A (en) * | 1976-02-04 | 1977-08-10 | Nissin Electric Co Ltd | Method of refining orthophosphoric acid ester oil for electric insulation |
| CN1961383A (en) * | 2004-05-28 | 2007-05-09 | 阿雷瓦T&D股份有限公司 | High performance dielectric oil and the use thereof in high voltage electrical equipment |
| JP2012023262A (en) * | 2010-07-16 | 2012-02-02 | Aichi Electric Co Ltd | Drying method of oil-filled electric apparatus |
| CN202405055U (en) * | 2012-01-01 | 2012-08-29 | 长春工程学院 | Oil replacement device for oil immersed power transformer |
| CN102908989A (en) * | 2012-09-29 | 2013-02-06 | 西安热工研究院有限公司 | High-performance microporous adsorbent for regeneration treatment of oil used in electric power industry, and preparation method of high-performance microporous adsorbent |
Non-Patent Citations (1)
| Title |
|---|
| 合成酯绝缘液在海上风电场变压器中的应用;李基成;《电气时代》;20120228;第52-53页 * |
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