CN103794337B - A kind of with SF6For the main transformer shell and tube heat dissipating method of coolant media - Google Patents
A kind of with SF6For the main transformer shell and tube heat dissipating method of coolant media Download PDFInfo
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- CN103794337B CN103794337B CN201410055926.0A CN201410055926A CN103794337B CN 103794337 B CN103794337 B CN 103794337B CN 201410055926 A CN201410055926 A CN 201410055926A CN 103794337 B CN103794337 B CN 103794337B
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- 239000002826 coolant Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 40
- 230000008676 import Effects 0.000 claims abstract description 33
- 239000003507 refrigerant Substances 0.000 claims abstract description 14
- 238000005057 refrigeration Methods 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 13
- 238000001704 evaporation Methods 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 230000009102 absorption Effects 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims 1
- 230000006698 induction Effects 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Transformer Cooling (AREA)
Abstract
The present invention relates to a kind of with SF6For the main transformer shell and tube heat dissipating method of coolant media, the device that the method adopts is by transformer oil stream cooling recirculation system and SF6Coolant circulating system composition, described transformer oil stream cooling recirculation system comprises main transformer body, oil pump and shell and tube SF6The tube side of evaporimeter, in described main transformer body, be loaded with transformer oil, described main transformer body top arranges cold oil import and cold oil inlet valve, and described main transformer body bottom is provided with hot oil outlet and deep fat delivery valve, and described oil pump is delivered to shell and tube SF by heat transformer oil from hot oil outlet6The tube side import of evaporimeter, described heat transformer oil is by SF6In coolant circulating system, be enclosed in tube side SF around6After refrigerant is cooling from shell and tube SF6The tube side outlet of evaporimeter flow to cold oil import. That the present invention has is safe and reliable, cooling effectiveness is high, equipment volume is little, few by oil mass, safeguard less, overall operation economic dispatch huge advantage, be the revolutionary character innovation of the main transformer type of cooling.
Description
Technical field
The present invention relates to a kind of with SF6For main transformer shell and tube heat abstractor and the method for coolant media.
Background technology
Main transformer is in running, due to the effect of electricity and magnetic, its coil and iron core can generate heat, as can not be in time this heat taken away, to cause main transformer to burn the even major accident of blast, therefore must come cooling coil and iron core by the transformer oil stream being full of in main transformer, and the heat that transformer oil stream is taken away needs to carry out heat exchange by heat abstractor, cooled cold oil stream enters main transformer body again and carries out cooling. The tradition main transformer type of cooling is mainly three kinds of air blast cooling, natural air cooled and water-cooleds, although water-cooled is economical, efficiency is also high, if if generation cooling water in cooling system is to main transformer Seepage, even minor leakage also will cause serious consequence; Air-cooled because air heat content is low, make main transformer cooling effectiveness low, main transformer, heat sink apparatus are manufactured the shortcomings such as bulky, many by oil mass, operating cost is high, maintenance is large.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, provide a kind of with SF6For main transformer shell and tube heat abstractor and the method for coolant media, can take away safe, reliable, efficient, economically the heat energy that main transformer in service produces, safety, the economical operation of powerful guarantee power system main transformer.
To achieve these goals, technical scheme one of the present invention is: a kind of with SF6For the main transformer shell and tube heat abstractor of coolant media, by transformer oil stream cooling recirculation system and SF6Coolant circulating system composition, described transformer oil stream cooling recirculation system comprises main transformer body, oil pump and shell and tube SF6The tube side of evaporimeter, in described main transformer body, be loaded with coil and iron core are carried out to cooling transformer oil, described main transformer body top is provided with cold oil import and the cold oil inlet valve for inputting cold transformer oil, described main transformer body bottom is provided with for the hot oil outlet of heat outputting transformer oil and deep fat delivery valve, and described oil pump is delivered to shell and tube SF by heat transformer oil from hot oil outlet6The tube side import of evaporimeter, described heat transformer oil is by SF6In coolant circulating system, be enclosed in tube side SF around6After refrigerant is cooling from shell and tube SF6The tube side outlet of evaporimeter flow to cold oil import.
Further, described SF6Coolant circulating system comprises SF6Refrigeration compressor, cooler, choke valve and shell and tube SF6The shell side of evaporimeter, described shell and tube SF6The outlet of evaporimeter shell side connects SF6The import of refrigeration compressor, described SF6The outlet of refrigeration compressor connects the import of cooler, and the outlet of described cooler connects shell and tube SF by choke valve6The import of evaporimeter shell side.
Further, described shell and tube SF6On pipeline between tube side outlet and the cold oil import of main transformer body of evaporimeter, oil temperature on-line measuring device is installed.
To achieve these goals, technical scheme two of the present invention is: a kind of with SF6For the main transformer shell and tube heat dissipating method of coolant media, the method adopts as above with SF6For the main transformer shell and tube heat abstractor of coolant media, and carry out according to the following steps: (1) opens the deep fat delivery valve of main transformer body bottom and the cold oil inlet valve on top; (2) open oil pump and SF6Coolant circulating system, transformer oil mobile in main transformer body is taken away the heat of main transformer coil and iron core generation, and transformer oil self is heated and becomes heat transformer oil, and the heat transformer oil being flowed out by deep fat delivery valve is squeezed into shell and tube SF through oil pump6The tube side of evaporimeter, and and SF6In coolant circulating system, be enclosed in the tube side low temperature SF of circulation around6Refrigerant carries out heat exchange, and its heat is by low temperature SF6Refrigerant is taken away and is become cold transformer oil, and cold transformer oil comes back in main transformer main body through cold oil inlet valve, and coil and iron core are carried out to next round cool cycles.
Further, in step (2), described SF6Coolant circulating system comprises SF6Refrigeration compressor, cooler, choke valve and shell and tube SF6The shell side of evaporimeter, described shell and tube SF6The outlet of evaporimeter shell side connects SF6The import of refrigeration compressor, described SF6The outlet of refrigeration compressor connects the import of cooler, and the outlet of described cooler connects shell and tube SF by choke valve6The import of evaporimeter shell side, its operation method is as follows: open SF6Refrigeration compressor, SF6Refrigeration compressor will be from shell and tube SF6Evaporimeter shell side low pressure SF out6Gas compression becomes high pressure-temperature SF6Gas, high pressure-temperature SF6Gas enters and in cooler, is cooled to high temperature SF6Liquid, high temperature SF6Liquid after choke valve expenditure and pressure cooling at shell and tube SF6In evaporimeter shell side, absorb the heat of heat transformer oil in tube sides in a large number and flash to low pressure SF6Gas, low pressure SF6Gas is delivered to again SF6In refrigeration compressor, compress, with this iterative cycles.
Further, described shell and tube SF6On pipeline between tube side outlet and the cold oil import of main transformer body of evaporimeter, oil temperature on-line measuring device is installed.
Compared with prior art, the present invention has following beneficial effect: due to the SF using6Medium, it is except having good insulation, arc extinguishing, putting out combustion performance and stable physicochemical property, or a kind of good refrigerant that has higher thermal enthalpy, the shell and tube evaporation endothermic type of cooling using it as refrigerant is compared with traditional main transformer type of cooling, have safe and reliable, cooling effectiveness is high, equipment volume is little, few by oil mass, safeguard less, overall operation economic dispatch huge advantage, be the revolutionary character innovation of the main transformer type of cooling.
The present invention had both overcome in the middle of prior art with the main transformer of water-cooling pattern and is in operation and occurs to main transformer body seepage as cooling system, even small seepage all will produce catastrophe failure in main transformer under high voltage environment, and the serious consequence that even main transformer explodes; The shortcomings such as prior art is central because air heat content is low, makes main transformer cooling effectiveness low with air blast cooling or natural air cooled main transformer, and device fabrication volume is large, many by oil mass, operating cost is high, maintenance workload is large are overcome again; Compared with being now widely used traditional main transformer radiating mode, the present invention has huge advantage.
Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.
Brief description of the drawings
Fig. 1 is the transformer oil stream cooling recirculation system schematic diagram of the embodiment of the present invention.
Fig. 2 is the SF of the embodiment of the present invention6Coolant circulating system schematic diagram.
Fig. 3 be the embodiment of the present invention with SF6For the main transformer shell and tube heat abstractor schematic diagram of coolant media.
Fig. 4 is that the control module of the embodiment of the present invention is controlled cold oil stream temperature functional-block diagram automatically.
In figure: 1-SF6Refrigeration compressor, 2-cooler inlet pipe, 3-cooler, 4-cooling blower, 5-cooler goes out pipe, 6-choke valve, 7-shell and tube SF6Evaporimeter, the import of 8-evaporimeter tube side, 9-shell and tube SF6The tube side of evaporimeter, oil stream in 10-evaporimeter tube side, the outlet of 11-evaporimeter tube side, the outlet of 12-evaporimeter shell side, 13-evaporimeter shell side outlet SF6Flow process, the import of 14-evaporimeter shell side, 15-shell and tube SF6The shell side of evaporimeter, 16-SF6The flow process of refrigerant in evaporimeter shell side, 17-deep fat delivery valve, 18-oil pump, 19-oil pump outlet valve, 20-cold oil inlet valve, 21-oil temperature on-line measuring device, 22-coil and iron core, 23-transformer oil, A-main transformer body, B-conservator.
Detailed description of the invention
As shown in Fig. 1 ~ 3, a kind of with SF6For the main transformer shell and tube heat abstractor of coolant media, by transformer oil stream cooling recirculation system and SF6Coolant circulating system composition, described transformer oil stream cooling recirculation system comprises main transformer body A, oil pump 18 and shell and tube SF6The tube side 9 of evaporimeter 7, in described main transformer body A, be loaded with coil and iron core 22 are carried out to cooling transformer oil 23, described main transformer body A top is provided with cold oil import and the cold oil inlet valve 20 for inputting cold transformer oil, described main transformer body A bottom is provided with hot oil outlet and the deep fat delivery valve 17 for heat outputting transformer oil, and described oil pump 18 is delivered to shell and tube SF by heat transformer oil 23 from hot oil outlet6Tube side 9 imports 8 of evaporimeter 7, described heat transformer oil is by SF6In coolant circulating system, be enclosed in tube side 9 SF around6After refrigerant is cooling from shell and tube SF6The tube side 9 of evaporimeter 7 exports 11 and flow to cold oil import. Wherein, the transformer oil 23 that its inside of described main transformer body A is full of mainly plays insulation and cooling effect, main transformer coil and iron core 22 are in operation because the effect of electricity, magnetic can be generated heat, and as not in time this heat taken away, will cause main transformer to burn the even major accident of blast.
In the present embodiment, described SF6Coolant circulating system comprises SF6Refrigeration compressor 1, cooler 3, choke valve 6 and shell and tube SF6The shell side 15 of evaporimeter 7, described shell and tube SF6The outlet of evaporimeter 7 shell sides connects SF6The import of refrigeration compressor 1, described SF6The outlet of refrigeration compressor 1 connects the import of cooler 3, and the outlet of described cooler 3 connects shell and tube SF by choke valve 66The import 14 of evaporimeter 7 shell sides. Wherein, described cooler 3 can be the forced air cooler of being forced quenching by cooling blower 4, can be also water cooler, owing to being SF in cooler 36Media for heat exchange, therefore just in case cooling water seepage is also irrelevant with main transformer oil stream; Described shell and tube SF6That evaporimeter 7 has is safe and reliable, heat exchange efficiency is high, cleaning is easy, safeguard the advantages such as simple; Described shell and tube SF6Evaporimeter 7 is divided into tube side 9 and 15 two medium flow process parts of isolating mutually of shell side, and transformer oil flow medium is at shell and tube SF6In evaporimeter 7, walk tube side 9, SF6Coolant media is at shell and tube SF6In evaporimeter 7, walk 15, two circulatory systems of shell side and mutually isolate, transformer oil and SF6Refrigerant is by shell and tube SF6In evaporimeter 7, the tube wall of tube side 9 carries out indirect heat exchange.
In the present embodiment, the outlet of described oil pump 18 is provided with oil pump outlet valve 19, and described oil pump outlet valve 19 is connected to the tube side 9 in evaporimeter through evaporimeter oil stream tube side inlet pipe. Regulate cooling velocity, the outlet of described cooler 3 and shell and tube SF for convenient according to actual conditions6On pipeline between the import 14 of evaporimeter 7 shell sides, choke valve 6 is installed, with to high temperature SF6Liquid carries out expenditure and pressure. For the convenient oil outlet temperature that detects tube side 9 in evaporimeter, described shell and tube SF6Tube side 9 outlet of evaporimeter 7 and the evaporimeter oil between the cold oil import of main transformer body A flow tube side and go out oil temperature on-line measuring device 21 is installed on pipe.
In the present embodiment, as shown in Figure 4, in order to facilitate intelligent automatic control, specifically electromagnetic throttle valve of described choke valve 6, specifically temperature monitor of described oil temperature on-line measuring device 21, described shell and tube SF6Evaporimeter 7 is interior can be provided with the inner SF of induction6The pressure sensor of gas pressure; Described temperature monitor, electromagnetic throttle valve and pressure sensor are all electrically connected at control module, described temperature monitor detects that by it evaporimeter tube side oil outlet temperature signal sends to control module, described control module regulates the valve opening of electromagnetic throttle valve, and described control module can be to make by technological requirement design programming the PLC or the single-chip microcomputer etc. that form. In the time that evaporimeter tube side oil outlet temperature is too high, the valve opening of electromagnetic throttle valve is turned in described control module control down, described shell and tube SF6Evaporimeter 7 evaporating pressures reduce, and then reduce SF in evaporimeter6Evaporating temperature is to reduce evaporimeter tube side oil outlet temperature, contrary conversely.
As shown in Fig. 1 ~ 3, a kind of with SF6For the main transformer shell and tube heat dissipating method of coolant media, the method adopts above-mentioned with SF6For the main transformer shell and tube heat abstractor of coolant media, and carry out according to the following steps: (1) opens the deep fat delivery valve 17 of main transformer body A bottom and the cold oil inlet valve 20 on top, open oil pump outlet valve 19; (2) open oil pump 18 and SF6Coolant circulating system, the heat that mobile transformer oil produces main transformer coil and iron core 22 in main transformer body A is taken away, and transformer oil self is heated and become heat transformer oil, and the heat transformer oil being flowed out by deep fat delivery valve 17 is squeezed into shell and tube SF through oil pump 186The tube side 9 of evaporimeter 7, and and SF6In coolant circulating system, be enclosed in the tube side 9 low temperature SF of circulation around6Refrigerant carries out heat exchange, and its heat is by low temperature SF6Refrigerant is taken away and is become cold transformer oil, and cold transformer oil comes back in main transformer main body through cold oil inlet valve 20, and coil and iron core 22 are carried out to next round cool cycles.
In the present embodiment, in step (2), described SF6Coolant circulating system comprises SF6Refrigeration compressor 1, cooler 3, choke valve 6 and shell and tube SF6The shell side 15 of evaporimeter 7, its operation method is as follows: open SF6Refrigeration compressor 1, SF6Refrigeration compressor 1 is by the low pressure SF from evaporimeter shell side outlet 126Gas compression becomes high pressure-temperature SF6Gas; Through SF6High pressure-temperature SF after refrigeration compressor 1 compression6Gas enters in cooler 3 by cooler inlet pipe 2, by cooling blower semi-finals quenching processed, by high pressure-temperature SF6Gas cooled is high temperature SF6Liquid; High temperature SF6Liquid after choke valve 6 expenditure and pressures coolings at shell and tube SF6In evaporimeter 7 shell sides 15, absorb the heat of heat transformer oil in tube sides in a large number and flash to low pressure SF6Gas, low pressure SF6Gas is delivered to again SF6Compression in refrigeration compressor 1, with this iterative cycles.
In the present embodiment, in step (2), from cooler 3 high temperature SF out6Liquid flow to shell and tube SF through choke valve 66The shell side 15 of evaporimeter 7, now because volume sudden enlargement causes part high temperature SF6Liquid rotating becomes low pressure SF6Gas, liquid evaporation becomes in the process of gas can a large amount of heat absorptions and make high temperature SF6Fluid temperature sharply declines, the low temperature SF after temperature declines6In liquid and evaporimeter, the mobile heat transformer oil stream of tube side 9 carries out heat exchange by tube wall, all flashes to low pressure SF after heat absorption6Gas, is back to SF through evaporimeter shell side outlet 126The import of refrigeration compressor 1, carries out next round heat exchange circulation.
In the present embodiment, as shown in Figure 4, can, according to the real-time online data of temperature monitor, regulate electromagnetic throttle valve automatically to control SF in evaporimeter shell side by control module6Evaporating pressure and evaporating temperature, be controlled in the scope of setting with the oil outlet temperature of the transformer oil that ensures to be cooled in evaporimeter tube side.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (1)
1. one kind with SF6For the main transformer shell and tube heat dissipating method of coolant media, it is characterized in that: the method adopts with SF6For the main transformer shell and tube heat abstractor of coolant media, described with SF6For the main transformer shell and tube heat abstractor of coolant media flows cooling recirculation system and SF by transformer oil6Coolant circulating system composition, described transformer oil stream cooling recirculation system comprises main transformer body, oil pump and shell and tube SF6The tube side of evaporimeter, in described main transformer body, be loaded with coil and iron core are carried out to cooling transformer oil, described main transformer body top is provided with cold oil import and the cold oil inlet valve for inputting cold transformer oil, described main transformer body bottom is provided with for the hot oil outlet of heat outputting transformer oil and deep fat delivery valve, and described oil pump is delivered to shell and tube SF by heat transformer oil from hot oil outlet6The tube side import of evaporimeter, described heat transformer oil is by SF6In coolant circulating system, be enclosed in tube side SF around6After refrigerant is cooling from shell and tube SF6The tube side outlet of evaporimeter flow to cold oil import, described shell and tube SF6On pipeline between tube side outlet and the cold oil import of main transformer body of evaporimeter, oil temperature on-line measuring device is installed; Described SF6Coolant circulating system comprises SF6Refrigeration compressor, cooler, choke valve and shell and tube SF6The shell side of evaporimeter, described shell and tube SF6The outlet of evaporimeter shell side connects SF6The import of refrigeration compressor, described SF6The outlet of refrigeration compressor connects the import of cooler, and the outlet of described cooler connects shell and tube SF by choke valve6The import of evaporimeter shell side; Described choke valve is electromagnetic throttle valve, and described oil temperature on-line measuring device is temperature monitor, described shell and tube SF6The inner SF of induction is installed in evaporimeter6The pressure sensor of gas pressure; Described temperature monitor, electromagnetic throttle valve and pressure sensor are all electrically connected at control module, described temperature monitor detects that by it evaporimeter tube side oil outlet temperature signal sends to control module, described control module regulates the valve opening of electromagnetic throttle valve, and described control module is to make by technological requirement design programming the PLC or the single-chip microcomputer that form; And carry out according to the following steps: (1) opens the deep fat delivery valve of main transformer body bottom and the cold oil inlet valve on top; (2) open oil pump and SF6Coolant circulating system, transformer oil mobile in main transformer body is taken away the heat of main transformer coil and iron core generation, and transformer oil self is heated and becomes heat transformer oil, and the heat transformer oil being flowed out by deep fat delivery valve is squeezed into shell and tube SF through oil pump6The tube side of evaporimeter, and and SF6In coolant circulating system, be enclosed in the tube side low temperature SF of circulation around6Refrigerant carries out heat exchange, and its heat is by low temperature SF6Refrigerant is taken away and is become cold transformer oil, and cold transformer oil comes back in main transformer main body through cold oil inlet valve, and coil and iron core are carried out to next round cool cycles; Wherein, described SF6The operation method of coolant circulating system is as follows: open SF6Refrigeration compressor, SF6Refrigeration compressor will be from shell and tube SF6Evaporimeter shell side low pressure SF out6Gas compression becomes high pressure-temperature SF6Gas, high pressure-temperature SF6Gas enters and in cooler, is cooled to high temperature SF6Liquid, high temperature SF6Liquid after choke valve expenditure and pressure cooling at shell and tube SF6In evaporimeter shell side, absorb the heat of heat transformer oil in tube sides in a large number and flash to low pressure SF6Gas, low pressure SF6Gas is delivered to again SF6In refrigeration compressor, compress, with this iterative cycles; From cooler high temperature SF out6Liquid flow to shell and tube SF through choke valve6The shell side of evaporimeter, now because volume sudden enlargement causes part high temperature SF6Liquid rotating becomes low pressure SF6Gas, liquid evaporation becomes in the process of gas can a large amount of heat absorptions and make high temperature SF6Fluid temperature sharply declines, the low temperature SF after temperature declines6In liquid and evaporimeter, the mobile heat transformer oil stream of tube side carries out heat exchange by tube wall, all flashes to low pressure SF after heat absorption6Gas, is back to SF through the outlet of evaporimeter shell side6The import of refrigeration compressor, carries out next round heat exchange circulation; In the time that evaporimeter tube side oil outlet temperature is too high, the valve opening of electromagnetic throttle valve is turned in described control module control down, described shell and tube SF6Evaporator evaporation pressure decreased, and then reduce SF in evaporimeter6Evaporating temperature is to reduce evaporimeter tube side oil outlet temperature, contrary conversely.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410055926.0A CN103794337B (en) | 2014-02-19 | 2014-02-19 | A kind of with SF6For the main transformer shell and tube heat dissipating method of coolant media |
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| CN201410055926.0A CN103794337B (en) | 2014-02-19 | 2014-02-19 | A kind of with SF6For the main transformer shell and tube heat dissipating method of coolant media |
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| CN103794337B true CN103794337B (en) | 2016-05-04 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106024316A (en) * | 2016-08-09 | 2016-10-12 | 胡启元 | Intelligent heat-radiating transformer |
| CN107706783A (en) * | 2017-09-29 | 2018-02-16 | 国网浙江省电力公司绍兴供电公司 | A kind of device for the heating cooling of fully closed combined electric unit conductor |
| CN107919767A (en) * | 2017-12-19 | 2018-04-17 | 苏州泰铎电气有限公司 | A kind of constant temperature magneto for tower shelf type oil pumping machine |
| CN114188127A (en) * | 2021-11-10 | 2022-03-15 | 国网福建省电力有限公司邵武市供电公司 | Power transformer cooling device and cooling method |
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| CN103390485A (en) * | 2013-07-22 | 2013-11-13 | 浙江江山特种变压器有限公司 | Liquid nitrogen strong cooling transformer and refrigerating method thereof |
| CN203366908U (en) * | 2013-05-24 | 2013-12-25 | 国家电网公司 | Heat pipe array oil cooler |
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| CN2331943Y (en) * | 1997-07-08 | 1999-08-04 | 王广林 | Shell-and-tube heat exchanger with area adjustable device |
| CN1390356A (en) * | 1999-11-17 | 2003-01-08 | 特里克斯科有限责任公司 | Apparatus and method for cooling power transformers |
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