CN103746539A - A flexible DC power transmission converter valve water-cooling system for islands - Google Patents
A flexible DC power transmission converter valve water-cooling system for islands Download PDFInfo
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- CN103746539A CN103746539A CN201310681005.0A CN201310681005A CN103746539A CN 103746539 A CN103746539 A CN 103746539A CN 201310681005 A CN201310681005 A CN 201310681005A CN 103746539 A CN103746539 A CN 103746539A
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Abstract
The invention provides a flexible DC power transmission converter valve water-cooling system for islands. The water-cooling system comprises main circulation water pumps, an air cooler, main filters, a converter valve and a degassing tank which are in pipeline connection to form a main circulation loop. The main circulation loop is connected in parallel with a water treatment loop. Buffer tanks are connected with a nitrogen pressure stabilizing system. An Ion exchange is connected with a water-supplementing system. The heat exchange tube bundle of the air cooler is made of stainless steel 316L material. Fins utilize epoxy resin coating aluminium sheets. An internal framework employs stainless steel 316Ti material and the external surface of the internal framework is sprayed with powder. The flexible DC power transmission converter valve water-cooling system effectively cools the converter valve, constant-flow cooling water is guaranteed to go into the converter valve, and valve-going temperature is stable without sudden rising and dropping. The flexible DC power transmission converter valve water-cooling system can change the water cooling heat dissipation capacity based on the change of IGBT thermal loads so as to control the valve-going temperature to be stale in a certain range, and guarantee the converter valve to operate stably.
Description
Technical field
The present invention relates to a kind of cooling system, for cooling flexible DC power transmission converter valve IGBT heater element.
Background technology
Nanao, Guangdong Province large-scale wind electricity flexible DC power transmission demonstration project adopts multiterminal flexible direct current technology at home first, Technology of HVDC based Voltage Source Converter is the voltage source converter (VSC) of bipolar transistor (IGBT) composition of insulating, controlled shutoff device and pulse-width modulation (PWM) technology are basic VSC-HVDC technology, compared with traditional HVDC Transmission Technology, have and control flexibly and easily, improve the stability of a system, increase system dynamic reactive-load deposit, improve the quality of power supply, save construction land, the features such as Installation and Debugging are easy to maintenance, on island, power, urban distribution network power supply, the aspects such as renewable resource is grid-connected have broad application prospects.
Flexible DC power transmission mode, as the important means of island power supply, is not limited by transmission range, is applicable to the grid-connected of Large Scale Offshore Wind Farm.Flexible direct current converter valve adopts IGBT element, because IGBT element produces huge heat in running, in order to guarantee the normal operation of element, needs water-cooling system to carry out cooling to it.Due to the particular surroundings on island, the anticorrosive property of relevant device has been proposed to specific (special) requirements, existing valve cooling system can not meet the environment for use on island, so need to develop the flexible DC power transmission converter valve water-cooling system of using on a kind of island.
Summary of the invention
The object of the invention is to overcome the shortcoming of above-mentioned prior art, a kind of flexible DC power transmission converter valve water-cooling system is provided, effectively take away the heat that IGBT element produces, guarantee converter valve safe and stable operation.
Flexible DC power transmission converter valve water-cooling system comprises the major cycle water pump, aerial cooler, main filter, converter valve and the degassing tank that by pipeline, are connected to form main circulation loop, described degassing tank in-built electrical heater, described major cycle water pump and main filter are equipped with standby;
Described main circulation loop is also parallel with water treatment loop, and described water treatment loop comprises the ion-exchanger, accurate filter and the surge tank that by pipeline, connect; The equal equipment of described ion-exchanger, accurate filter and surge tank is used; The outlet of described ion-exchanger all arranges deionized water conductivity transmitter.Impurity in cooling water easily produces leakage current and galvano-cautery under condition of high voltage, affects the normal operation of converter valve, and for adapting to the instructions for use of large power power electronic appliance under high voltage condition, cooling water must possess extremely low conductivity.Therefore in main circulation loop water treatment in parallel loop, for removing the zwitterion of cooling water, reach the object constantly purifying water.The cooling water flow of part main circulation loop, through ion-exchanger, constantly purifies the ion that may separate out in pipeline, and then then flow through accurate filter and surge tank collaborate at the entrance of the degassing tank of main circulation loop.Ion-exchanger is established 2 covers altogether, standby each other, and the outlet of ion-exchanger arranges conductivity transmitter, and the failure conditions of monitoring deionization electrical conductivity of water and resin, when an ion-exchanger fault, can switch to another ion-exchanger.Accurate filter is arranged on ion-exchanger outlet, the resin particle that interception may be broken.Expansion drum is arranged on accurate filter outlet.
Described surge tank is connected with nitrogen stabilization pressure system, described nitrogen stabilization pressure system comprises nitrogen cylinder and tonifying Qi electromagnetically operated valve, described nitrogen cylinder and tonifying Qi electromagnetically operated valve are equipped with standby, and nitrogen cylinder is by tonifying Qi electromagnetically operated valve to expansion drum tonifying Qi, and available buffer is because cooling water temperature changes the change in volume causing;
Described ion-exchanger is connected with water charging system, described water charging system comprises the raw water pump, filter, raw water box, small pump and the moisturizing electrical ball valve that by pipeline, connect, described small pump is provided with standby, water charging system can be realized the automatic water supplement function to water-cooling system, when the liquid level of surge tank starts liquid level lower than small pump, small pump starts, and moisturizing electrical ball valve is opened automatically, moisturizing is to the normal liquid level of surge tank regulation, and now termination of pumping, electrical ball valve are closed.
The heat-exchanging tube bundle material of described aerial cooler adopts Stainless steel 316 L tubing, and fin adopts epoxy coating aluminium flake, can resist marine corrosion amblent air temperature, and inner frame adopts Stainless steel 316 Ti, and does the processing of powder spray outer surface.Generally, all aerial coolers put into operation, and the type selecting of aerial cooler should meet two conditions: (1) under extreme conditions, still can have 20% surplus; During (2) aerial cooler faults, still can meet the requirement of specified heat dissipation capacity.At outside air temperature, reduce or converter valve load is less in the situation that, can first regulates aerial cooler fan operation number of units, then realize the accurate control to water temperature by the rotating speed of variable frequency adjustment blower fan.
In order better to realize the present invention, described main circulation loop is provided with into valve temperature transmitter; Main circulation loop is parallel with conductivity test loop, and conductivity measurement loop is provided with cooling water conductivity transmitter; Surge tank is provided with fluid level transmitter, described in enter valve temperature transmitter, cooling water conductivity transmitter and expansion drum liquid level gauge and take the principle of " three get two ", prevent from stopping transport because valve cooling system instrument fault causes converter valve.
In order better to realize the present invention, described main circulation loop also includes cooling water flow transmitter, goes out valve temperature transmitter, aerial cooler return water temperature transmitter, go out valve temperature transmitter, go out valve pressure transmitter, enter valve pressure transmitter and main circulation pump discharge pressure transmitter, and expansion drum is provided with pressure transmitter.
In order better to realize the present invention, described flexible DC power transmission converter valve water-cooling system adopts redundant manipulator.Thereby realize: the monitoring to valve cooling system and protection; The working condition of flexible DC power transmission converter valve water-cooling system is uploaded to main pole control or station control; Flexible DC power transmission converter valve water-cooling system is carried out to Long-distance Control.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
(1) flexible DC power transmission converter valve water-cooling system effective cooling converter valve, guarantees that the cooling water of constant flow rate enters converter valve, enters valve temperature stabilization, without rising sharply rapid drawdown.Flexible direct current converter valve water-cooling system can change water-cooling amount according to the variation of IGBT heat load, controls into valve temperature stabilization within the specific limits, guarantees the stable operation of converter valve;
(2) aerial cooler fully takes into account seashore environment, takes anticorrosive measure, guarantees the normal operation of aerial cooler;
(3) control system of flexible DC power transmission converter valve water-cooling system adopts redundant configuration, and Complete set of instrument adopts three to select two principle, more safe and reliable.
Accompanying drawing explanation
Fig. 1 is the system configuration schematic diagram described in an embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, an embodiment of the invention are described in further detail, but embodiments of the present invention are not limited to this.
Embodiment 1
As shown in Figure 1, flexible DC power transmission converter valve water-cooling system comprises the major cycle water pump 1-1 and 1-2, aerial cooler 2, main filter 3-1 and 3-2, converter valve 4 and the degassing tank 5 that by pipeline, are connected to form main circulation loop, described degassing tank 5 in-built electrical heaters 51, described major cycle water pump and main filter are equipped with standby;
Described main circulation loop is also parallel with water treatment loop, and described water treatment loop comprises the ion-exchanger 6-1 and 6-2, accurate filter 7-1 and 7-2, surge tank 8-1 and the 8-2 that by pipeline, connect; The equal equipment of described ion-exchanger, accurate filter and surge tank is used; The outlet of described ion-exchanger 6-1 arranges deionized water conductivity transmitter 9-1, and the outlet of ion-exchanger 6-2 arranges deionized water conductivity transmitter 9-2.Impurity in cooling water easily produces leakage current and galvano-cautery under condition of high voltage, affects the normal operation of converter valve, and for adapting to the instructions for use of large power power electronic appliance under high voltage condition, cooling water must possess extremely low conductivity.Therefore in main circulation loop water treatment in parallel loop, for removing the zwitterion of cooling water, reach the object constantly purifying water.The cooling water flow of part main circulation loop, through ion-exchanger, constantly purifies the ion that may separate out in pipeline, and then then flow through accurate filter and surge tank collaborate at the entrance of the degassing tank of main circulation loop.Ion-exchanger is established 2 covers altogether, standby each other, and the outlet of ion-exchanger arranges conductivity transmitter, and the failure conditions of monitoring deionization electrical conductivity of water and resin, when an ion-exchanger fault, can switch to another ion-exchanger.Accurate filter is arranged on ion-exchanger outlet, the resin particle that interception may be broken.Expansion drum is arranged on accurate filter outlet.
Described surge tank is connected with nitrogen stabilization pressure system, described nitrogen stabilization pressure system comprises nitrogen cylinder 9-1 and 9-2 and tonifying Qi electromagnetically operated valve 10-1 and 10-2, described nitrogen cylinder and tonifying Qi electromagnetically operated valve are equipped with standby, nitrogen cylinder is by tonifying Qi electromagnetically operated valve to expansion drum tonifying Qi, and available buffer is because cooling water temperature changes the change in volume causing;
Described ion-exchanger is connected with water charging system, described water charging system comprises raw water pump 11, filter 12, raw water box 13, small pump 14-1 and the 14-1, the moisturizing electrical ball valve 15 that by pipeline, connect, described small pump is provided with standby, water charging system can be realized the automatic water supplement function to water-cooling system, when the liquid level of surge tank starts liquid level lower than small pump, small pump starts, and moisturizing electrical ball valve is opened automatically, moisturizing is to the normal liquid level of surge tank regulation, and now termination of pumping, electrical ball valve are closed.
In order better to realize the present invention, the heat-exchanging tube bundle material of described aerial cooler 2 adopts Stainless steel 316 L tubing, and fin adopts epoxy coating aluminium flake, can resist marine corrosion amblent air temperature, inner frame adopts Stainless steel 316 Ti, and does the processing of powder spray outer surface.Generally, all aerial coolers put into operation, and the type selecting of aerial cooler should meet two conditions: (1) under extreme conditions, still can have 20% surplus; During (2) aerial cooler faults, still can meet the requirement of specified heat dissipation capacity.At outside air temperature, reduce or converter valve load is less in the situation that, can first regulates aerial cooler fan operation number of units, then realize the accurate control to water temperature by the rotating speed of variable frequency adjustment blower fan.
In order better to realize the present invention, described main circulation loop is provided with into valve temperature transmitter 16-1,16-2 and 16-3; Main circulation loop is parallel with conductivity test loop, and conductivity measurement loop is provided with cooling water conductivity transmitter 17-1,17-2 and 17-3; Surge tank is provided with fluid level transmitter 18-1,18-2 and 18-3, described in enter valve temperature transmitter, cooling water conductivity transmitter and expansion drum liquid level gauge and take the principle of " three get two ", prevent from stopping transport because valve cooling system instrument fault causes converter valve.
In order better to realize the present invention, described main circulation loop also includes cooling water flow transmitter 19-1 and 10-2, goes out valve temperature transmitter 20-1 and 20-2, aerial cooler return water temperature transmitter 21-1 and 21-2, goes out valve pressure transmitter 22-1 and 22-2, enters valve pressure transmitter 23-1 and 23-2, main circulation pump discharge pressure transmitter 24-1 and 24-2, and expansion drum is provided with pressure transmitter 25-1 and 25-2.
In order better to realize the present invention, described flexible DC power transmission converter valve water-cooling system adopts redundant manipulator.Thereby realize: the monitoring to valve cooling system and protection; The working condition of flexible DC power transmission converter valve water-cooling system is uploaded to main pole control or station control; Flexible DC power transmission converter valve water-cooling system is carried out to Long-distance Control.
Aerial cooler type selecting: specified radiator 460kW, selects 3 aerial coolers.
1) 3 type selection calculation of heat dissipation capacity while simultaneously working
Separate unit heat dissipation capacity 154kW, 3 total heat dissipation capacities are 468kW, when aerial cooler inlet temperature is 58 ℃, outlet water temperature is 52 ℃ of 50 ℃ of < design rated temperatures, surplus 79.5%;
2) 2 work, heat dissipation capacity type selection calculation when the 3rd deck valve door is not closed
Separate unit heat dissipation capacity 230kW, 2 total heat dissipation capacities are 460kW, when inlet temperature is 62.1 ℃, three mixed outlet water temperatures are 54 ℃ of 54 ℃=early warning temperature, surplus 17.2%.
3) 2 work, heat dissipation capacity type selection calculation during the 3rd valve closing
Separate unit heat dissipation capacity 230kW, 2 total heat dissipation capacities are 460kW, when inlet temperature is 58 ℃, three mixed outlet water temperatures are 54 ℃ of 52.66 ℃ of < early warning temperature, surplus 1.3%;
Above-described embodiment is preferably execution mode of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (4)
1. flexible DC power transmission converter valve water-cooling system is characterized in that: described flexible DC power transmission converter valve water-cooling system comprises the major cycle water pump, aerial cooler, main filter, converter valve and the degassing tank that by pipeline, are connected to form main circulation loop, described degassing tank in-built electrical heater, described major cycle water pump and main filter are equipped with standby;
Described main circulation loop is also parallel with water treatment loop, and described water treatment loop comprises the ion-exchanger, accurate filter and the surge tank that by pipeline, connect; The equal equipment of described ion-exchanger, accurate filter and surge tank is used; The outlet of described ion-exchanger all arranges deionized water conductivity transmitter;
Described surge tank is connected with nitrogen stabilization pressure system, and described nitrogen stabilization pressure system comprises nitrogen cylinder and tonifying Qi electromagnetically operated valve, and described nitrogen cylinder and tonifying Qi electromagnetically operated valve are equipped with standby;
Described ion-exchanger is connected with water charging system, and described water charging system comprises the raw water pump, filter, raw water box, small pump and the moisturizing electrical ball valve that by pipeline, connect, and described small pump is provided with standby;
The heat-exchanging tube bundle material of described aerial cooler adopts Stainless steel 316 L tubing, and fin adopts epoxy coating aluminium flake, and inner frame adopts Stainless steel 316 Ti, and does the processing of powder spray outer surface.
2. flexible DC power transmission converter valve water-cooling system according to claim 1, is characterized in that: described main circulation loop is provided with into valve temperature transmitter; Main circulation loop is parallel with conductivity test loop, and conductivity measurement loop is provided with cooling water conductivity transmitter; Surge tank is provided with fluid level transmitter, described in enter valve temperature transmitter, cooling water conductivity transmitter and expansion drum liquid level gauge and take the principle of " three get two ".
3. flexible DC power transmission converter valve water-cooling system according to claim 1, it is characterized in that: described main circulation loop also includes cooling water flow transmitter, goes out valve temperature transmitter, aerial cooler return water temperature transmitter, go out valve temperature transmitter, go out valve pressure transmitter, enter valve pressure transmitter and main circulation pump discharge pressure transmitter, expansion drum is provided with pressure transmitter.
4. flexible DC power transmission converter valve water-cooling system according to claim 1, is characterized in that: described flexible DC power transmission converter valve water-cooling system adopts redundant manipulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310681005.0A CN103746539A (en) | 2013-12-12 | 2013-12-12 | A flexible DC power transmission converter valve water-cooling system for islands |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310681005.0A CN103746539A (en) | 2013-12-12 | 2013-12-12 | A flexible DC power transmission converter valve water-cooling system for islands |
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| CN103746539A true CN103746539A (en) | 2014-04-23 |
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| CN201310681005.0A Pending CN103746539A (en) | 2013-12-12 | 2013-12-12 | A flexible DC power transmission converter valve water-cooling system for islands |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103957683A (en) * | 2014-05-13 | 2014-07-30 | 瑟帕斯（天津）水系统科技有限公司 | Sealed type circulating cooling system suitable for power electronic equipment |
| CN104955318A (en) * | 2015-07-07 | 2015-09-30 | 国网上海市电力公司 | Water tank system for inner cooling water storage |
| CN105099137A (en) * | 2015-08-25 | 2015-11-25 | 许继集团有限公司 | Converter valve cooling system and ionized water removing apparatus |
| CN105226535A (en) * | 2015-10-30 | 2016-01-06 | 比赫电气（太仓）有限公司 | A kind of flexible AC transmission equipment water-cooling system |
| CN105978299A (en) * | 2016-07-05 | 2016-09-28 | 沈阳远大电力电子科技有限公司 | Water cooling and high voltage frequency converter system |
| CN106440756A (en) * | 2016-10-25 | 2017-02-22 | 顾金华 | Steam cylinder electric control drainage device |
| CN106679259A (en) * | 2015-11-09 | 2017-05-17 | 杭州盛忆镐科技有限公司 | Treatment device for cooling water circulation |
| CN107434318A (en) * | 2017-09-13 | 2017-12-05 | 沈阳创联工业技术有限公司 | A kind of closed cooling water system of reactive-load compensation generating means |
| CN109065514A (en) * | 2018-10-09 | 2018-12-21 | 常州博瑞电力自动化设备有限公司 | A kind of water cooler refrigeration-type closed water-cooled system |
| CN109546643A (en) * | 2018-10-24 | 2019-03-29 | 中国南方电网有限责任公司超高压输电公司广州局 | A kind of DC load limitation guard method based on Converter Station Valve cooling system cooling capacity |
| CN109639104A (en) * | 2017-06-29 | 2019-04-16 | 许昌许继晶锐科技有限公司 | A kind of direct-current transmission converter valve cooling back installation and direct current transportation equipment |
| CN110719720A (en) * | 2019-10-23 | 2020-01-21 | 常州博瑞电力自动化设备有限公司 | Offshore platform flexible direct-current converter valve external cooling system adopting seawater cooling |
| CN110854826A (en) * | 2019-10-18 | 2020-02-28 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Fault diagnosis and processing method for two-out-of-three protection system of flexible direct converter valve |
| CN111362356A (en) * | 2020-03-17 | 2020-07-03 | 中国南方电网有限责任公司超高压输电公司广州局 | Switching system, control system and method of EDI device and ion exchange resin loop |
| CN111396302A (en) * | 2020-03-26 | 2020-07-10 | 广州高澜节能技术股份有限公司 | Water pump test system |
| CN112533442A (en) * | 2020-11-20 | 2021-03-19 | 内蒙古工业大学 | Microelectronic high-efficiency heat dissipation device |
| CN112596553A (en) * | 2020-11-13 | 2021-04-02 | 河南晶锐冷却技术股份有限公司 | Valve cooling nitrogen pressure stabilizing system for offshore flexible direct current power transmission |
| WO2021114378A1 (en) * | 2019-12-10 | 2021-06-17 | 广州高澜节能技术股份有限公司 | Liquid-cooled pump station applicable in offshore wind power |
| CN112992488A (en) * | 2021-03-22 | 2021-06-18 | 保定天威保变电气股份有限公司 | Cooling method for flexible-direct transformer of internal circulation water cooling system |
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2013
- 2013-12-12 CN CN201310681005.0A patent/CN103746539A/en active Pending
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103957683A (en) * | 2014-05-13 | 2014-07-30 | 瑟帕斯（天津）水系统科技有限公司 | Sealed type circulating cooling system suitable for power electronic equipment |
| CN104955318A (en) * | 2015-07-07 | 2015-09-30 | 国网上海市电力公司 | Water tank system for inner cooling water storage |
| CN104955318B (en) * | 2015-07-07 | 2017-08-25 | 国网上海市电力公司 | A kind of inner cold water storage tank system |
| CN105099137A (en) * | 2015-08-25 | 2015-11-25 | 许继集团有限公司 | Converter valve cooling system and ionized water removing apparatus |
| CN105226535A (en) * | 2015-10-30 | 2016-01-06 | 比赫电气（太仓）有限公司 | A kind of flexible AC transmission equipment water-cooling system |
| CN106679259A (en) * | 2015-11-09 | 2017-05-17 | 杭州盛忆镐科技有限公司 | Treatment device for cooling water circulation |
| CN105978299A (en) * | 2016-07-05 | 2016-09-28 | 沈阳远大电力电子科技有限公司 | Water cooling and high voltage frequency converter system |
| CN106440756A (en) * | 2016-10-25 | 2017-02-22 | 顾金华 | Steam cylinder electric control drainage device |
| CN109639104B (en) * | 2017-06-29 | 2021-08-20 | 河南晶锐冷却技术股份有限公司 | Direct-current transmission converter valve circulating cooling device and direct-current transmission equipment |
| CN109639104A (en) * | 2017-06-29 | 2019-04-16 | 许昌许继晶锐科技有限公司 | A kind of direct-current transmission converter valve cooling back installation and direct current transportation equipment |
| CN107434318A (en) * | 2017-09-13 | 2017-12-05 | 沈阳创联工业技术有限公司 | A kind of closed cooling water system of reactive-load compensation generating means |
| CN109065514A (en) * | 2018-10-09 | 2018-12-21 | 常州博瑞电力自动化设备有限公司 | A kind of water cooler refrigeration-type closed water-cooled system |
| CN109546643A (en) * | 2018-10-24 | 2019-03-29 | 中国南方电网有限责任公司超高压输电公司广州局 | A kind of DC load limitation guard method based on Converter Station Valve cooling system cooling capacity |
| CN110854826A (en) * | 2019-10-18 | 2020-02-28 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Fault diagnosis and processing method for two-out-of-three protection system of flexible direct converter valve |
| CN110854826B (en) * | 2019-10-18 | 2021-07-20 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Fault diagnosis and processing method for two-out-of-three protection system of flexible direct converter valve |
| CN110719720A (en) * | 2019-10-23 | 2020-01-21 | 常州博瑞电力自动化设备有限公司 | Offshore platform flexible direct-current converter valve external cooling system adopting seawater cooling |
| WO2021114378A1 (en) * | 2019-12-10 | 2021-06-17 | 广州高澜节能技术股份有限公司 | Liquid-cooled pump station applicable in offshore wind power |
| CN111362356A (en) * | 2020-03-17 | 2020-07-03 | 中国南方电网有限责任公司超高压输电公司广州局 | Switching system, control system and method of EDI device and ion exchange resin loop |
| CN111396302A (en) * | 2020-03-26 | 2020-07-10 | 广州高澜节能技术股份有限公司 | Water pump test system |
| CN112596553A (en) * | 2020-11-13 | 2021-04-02 | 河南晶锐冷却技术股份有限公司 | Valve cooling nitrogen pressure stabilizing system for offshore flexible direct current power transmission |
| CN112533442A (en) * | 2020-11-20 | 2021-03-19 | 内蒙古工业大学 | Microelectronic high-efficiency heat dissipation device |
| CN112992488A (en) * | 2021-03-22 | 2021-06-18 | 保定天威保变电气股份有限公司 | Cooling method for flexible-direct transformer of internal circulation water cooling system |
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Application publication date: 20140423 |