CN103824677B - A kind of main transformer winding and oil flow optimum intelligent control system and the control method of the temperature difference - Google Patents
A kind of main transformer winding and oil flow optimum intelligent control system and the control method of the temperature difference Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 71
- 238000004804 winding Methods 0.000 title claims abstract description 67
- 239000006200 vaporizer Substances 0.000 claims abstract description 52
- 239000002826 coolant Substances 0.000 claims abstract description 47
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 36
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- 238000005057 refrigeration Methods 0.000 claims abstract description 19
- 239000003507 refrigerant Substances 0.000 claims description 23
- 238000001816 cooling Methods 0.000 claims description 22
- 230000008676 import Effects 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 11
- 239000000446 fuel Substances 0.000 claims description 10
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 230000000171 quenching effect Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000010223 real-time analysis Methods 0.000 description 1
- 238000005382 thermal cycling Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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Abstract
The present invention relates to the optimum intelligent control system of a kind of main transformer winding with the oil stream temperature difference and control method, this Controlling System comprises circulation of oil flow system, frequency changing refrigeration system, main transformer winding temperature measurement on-line device, transformer oil temperature measurement on-line device, sensing device and control module, described circulation of oil flow system comprises transformer oil, main transformer body, the transformer oil flow process of frequency conversion oil pump and vaporizer, described frequency changing refrigeration system comprises coolant media, the coolant media flow process of Refrigerating Compressor with Inverter and vaporizer, described transformer oil circulates in vaporizer and carries out heat exchange with coolant media, described main transformer winding temperature measurement on-line device and transformer oil temperature measurement on-line device are installed on main transformer body and are electrically connected at sensing device, described sensing device, frequency conversion oil pump and Refrigerating Compressor with Inverter are electrically connected at control module. the present invention has the advantages such as safe and reliable, operation is efficient, energy consumption is low, maintenance service is few, is the revolutionary innovation that main transformer runs.
Description
Technical field
The present invention relates to the optimum intelligent control system of a kind of main transformer winding with the oil stream temperature difference and control method.
Background technology
The cooling control mode that tradition main transformer runs is mainly air blast cooling operation control and water-cooled runs control two kinds, and natural air cooled do not exist cooling control. Although water-cool control cooling runs, span of control is relatively big, economical operation, efficiency are also high, if but cooling system occurs water coolant to main transformer seepage phenomenon, even minor leakage, serious consequence also will be caused. Therefore, the cooling controlling run of existing most main transformer all adopts air blast cooling control mode, and air blast cooling Controlling System is because air heat content is low, the temperature difference is little, and the impact by envrionment temperature, make main transformer cooling efficiency low, it is very little that main transformer runs cooling span of control, and adopts the main transformer of air blast cooling operation scheme, exist equipment volume huge, run and manufacturing cost height, by oil amount is many, maintenance is big etc. many shortcomings.
Along with load increases in main transformer operation, its winding electric current increases, the thermal value of winding also increases thereupon, now winding is cooled by the oil stream in main transformer, oil stream self is heated, and returns in main transformer after being cooled by external cooling control system again and cool winding, moves in circles, to ensure main transformer safe operation, otherwise main transformer will burn. Not affecting under mobility status, oil temperature is more low to be run more favourable to main transformer, but too low oil temperature, running cost can be made significantly to increase. Therefore, it is necessary to design a kind of by main transformer winding with oil stream temperature difference Intelligent Dynamic control the system and method at optimal balance point.
Summary of the invention
In order to overcome the deficiencies in the prior art part, it is an object of the invention to provide a kind of safe and reliable, run efficient, energy consumption is low, maintenance service is few and the optimum intelligent control system of the main transformer winding of economical operation and the oil stream temperature difference and control method.
In order to realize above-mentioned purpose, the technical scheme one of the present invention is: a kind of main transformer winding and the optimum intelligent control system of the oil stream temperature difference, comprise circulation of oil flow system, frequency changing refrigeration system, main transformer winding temperature measurement on-line device, transformer oil temperature measurement on-line device, sensing device and control module, described circulation of oil flow system comprises main transformer body, cold oil fuel charging valve, the oily fuel-displaced valve of heat, the transformer oil flow process of frequency conversion oil pump and vaporizer, is loaded with the transformer oil cooled by winding in described main transformer body, described frequency changing refrigeration system comprises coolant media, Refrigerating Compressor with Inverter, condenser, the coolant media flow process of throttling valve and vaporizer, described transformer oil circulates in vaporizer and carries out heat exchange with coolant media, described main transformer winding temperature measurement on-line device and transformer oil temperature measurement on-line device are installed on main transformer body, described main transformer winding temperature measurement on-line device and transformer oil temperature measurement on-line device are electrically connected at sensing device, described sensing device, frequency conversion oil pump and Refrigerating Compressor with Inverter are electrically connected at control module.
Further, described cold oil fuel charging valve is arranged on the cold oil ingress on main transformer body top, the oily fuel-displaced valve of described heat is arranged on the hot oil outlet place of main transformer body bottom, heat transformer oil is delivered to the transformer oil flow process of vaporizer by described oil pump from hot oil outlet, the coolant media that described heat transformer oil is enclosed in the coolant media flow process of vaporizer around transformer oil flow process is back in main transformer body from cold oil import after cooling.
Further, the coolant media flow process outlet of described vaporizer connects the import of Refrigerating Compressor with Inverter, and the outlet of described Refrigerating Compressor with Inverter connects the import of condenser, and the outlet of described condenser connects the coolant media flow process import of vaporizer by throttling valve.
Further, described control module comprises Signal reception unit, analytic operation unit and actuator unit.
Further, described control module is PLC or micro-chip.
In order to realize above-mentioned purpose, the technical scheme two of the present invention is: a kind of main transformer winding and the optimum intelligent control method of the oil stream temperature difference, adopt the optimum intelligent control system of main transformer winding as above with the oil stream temperature difference, and carry out according to the following steps:
(1) opening the hot oily fuel-displaced valve in circulation of oil flow system, cold oil fuel charging valve, the transformer oil flow process of vaporizer and frequency conversion oil pump, now transformer oil starts to circulate;
(2) open the condenser in frequency changing refrigeration system, throttling valve, the coolant media flow process of vaporizer and Refrigerating Compressor with Inverter, start refrigeration work;
(3) control module is opened, main transformer winding temperature measurement on-line device and transformer oil temperature measurement on-line device measure the oil stream temperature in main transformer winding temperature and main transformer body respectively in real time, the online temperature data that main transformer winding temperature measurement on-line device and transformer oil temperature measurement on-line device transmit is changed into numerary signal and sends control module to by sensing device respectively, two groups of numerary signals that control module transmits according to sensing device carry out intellectual analysis computing, and send different instruction according to different load section and Refrigerating Compressor with Inverter and frequency conversion oil pump are carried out intelligent control, run under making main transformer winding and oil stream temperature remain at optimum temperature difference state.
Further, in step (3), when main transformer operating load is big, when winding temperature raises, control module controls Refrigerating Compressor with Inverter frequency automatically to be increased, and increase is exerted oneself, and the frequency of control frequency conversion oil pump increases automatically simultaneously, increases circulation of oil flow amount; When main transformer operating load reduces, when winding temperature reduces, on the contrary above automatic control; When winding temperature with oil stream temperature difference in setting range time, Refrigerating Compressor with Inverter stopping work, frequency conversion oil pump runs with minimum load.
Compared with prior art, the present invention has following useful effect: owing to adopting intelligent frequency-conversion Dynamic controlling, cooling span of control is big, achieve the optimal operation mode of main transformer winding with the oil stream temperature difference, significantly reduce main transformer copper loss and iron loss, greatly improve main transformer operation conditions, remain that main transformer high-efficiency environment friendly runs, and it is more safe and reliable, and device fabrication cost and equipment volume can be reduced, reduce by oil amount, extend main transformer work-ing life and reduce the advantages such as maintenance, it it is the revolutionary innovation of main transformer manufacture and operation scheme, compare with operation scheme with the manufacture of existing main transformer, the present invention has the huge advantage that cannot intend ratio.
Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.
Accompanying drawing explanation
Fig. 1 is that the main transformer winding of the embodiment of the present invention is immersed in transformer oil cooled schematic diagram.
Fig. 2 is the transformer oil stream refrigeration cycle schematic diagram of the embodiment of the present invention.
Fig. 3 is the frequency changing refrigeration system work schematic diagram of the embodiment of the present invention.
Fig. 4 is the main transformer winding of the embodiment of the present invention and the optimum intelligent control workflow schematic diagram of the oil stream temperature difference.
The control module that Fig. 5 is the embodiment of the present invention controls main transformer winding temperature difference operation logic block diagram optimum with oil stream automatically.
In figure: 1-winding, 2-transformer oil, 3-main transformer winding temperature measurement on-line device, 4-transformer oil temperature measurement on-line device, the 5-oily fuel-displaced valve of heat, 6-frequency conversion oil pump, the fuel-displaced valve of 7-frequency conversion oil pump, 8-oil flows to the transformer oil flow process of vaporizer, the transformer oil flow process of 9-vaporizer, 10-oil flows out the transformer oil flow process of vaporizer, 11-cold oil fuel charging valve, 12-Refrigerating Compressor with Inverter, 13-condenser inlet, 14-condenser, 15-cooling blower, 16-condensator outlet, 17-throttling valve, 18-vaporizer, the coolant media flow process of 19-vaporizer, 20-coolant media goes out the flow process of vaporizer to Refrigerating Compressor with Inverter import, 21-main transformer body, 22-conservator.
Embodiment
As shown in Fig. 1 ~ 5, a kind of main transformer winding and the optimum intelligent control system of the oil stream temperature difference, comprise circulation of oil flow system, frequency changing refrigeration system, main transformer winding temperature measurement on-line device 3, transformer oil temperature measurement on-line device 4, sensing device and control module, described circulation of oil flow system comprises main transformer body 21, cold oil fuel charging valve 11, the oily fuel-displaced valve 5 of heat, the transformer oil flow process 9 of frequency conversion oil pump 6 and vaporizer, is loaded with the transformer oil 2 cooled by winding 1 in described main transformer body 21, described frequency changing refrigeration system comprises coolant media, Refrigerating Compressor with Inverter 12, condenser 14, the coolant media flow process 19 of throttling valve 17 and vaporizer, described transformer oil 2 circulates in vaporizer 18 and carries out heat exchange with coolant media, described main transformer winding temperature measurement on-line device 3 and transformer oil temperature measurement on-line device 4 are installed on main transformer body 21, described main transformer winding temperature measurement on-line device 3 and transformer oil temperature measurement on-line device 4 are electrically connected at sensing device, described sensing device, frequency conversion oil pump 6 and Refrigerating Compressor with Inverter 12 are electrically connected at control module.
In the present embodiment, described cold oil fuel charging valve 11 is arranged on the cold oil ingress on main transformer body 21 top, the oily fuel-displaced valve 5 of described heat is arranged on the hot oil outlet place of main transformer body 21 bottom, the outlet of described frequency conversion oil pump 6 is provided with the fuel-displaced valve 7 of frequency conversion oil pump, described transformer oil 2 cools the heat that main transformer winding 1 produces due to galvanic action, and main transformer load is more high, and the electric current that its winding 1 passes through is also more big, thermal value is more big, and vice versa; Heat transformer oil 2 is delivered to the transformer oil flow process 9 of vaporizer by described oil pump from hot oil outlet, after the coolant media that described heat transformer oil 2 is enclosed in the coolant media flow process 19 of vaporizer around transformer oil flow process cools, it is back in main transformer body from cold oil import, main transformer winding 1 is cooled by the oily stream of predetermined amount of flow and temperature, winding 1 is made to keep an optimum temperature approach all the time with cooling oil stream, it is achieved main transformer runs with best situation.
In the present embodiment, the coolant media flow process 19 of described vaporizer exports the import connecting Refrigerating Compressor with Inverter 12, the outlet of described Refrigerating Compressor with Inverter 12 connects the import of condenser 14, the outlet of described condenser 14 connects coolant media flow process 19 import of vaporizer by throttling valve 17, and described coolant media can be SF6Deng. Wherein, described condenser 14 is air-cooled condenser 14, namely is undertaken forcing quenching by cooling blower 15, and certain condenser 14 can also be water condenser 14, owing to condenser 14 being coolant media indirect heat exchange, therefore just in case water coolant seepage is also unrelated etc. with main transformer oil stream. The transformer oil flow process 9 of described vaporizer and coolant media flow process are two medium flow process parts isolated mutually, transformer oil flow medium walks transformer oil flow process in vaporizer 18, coolant media walks coolant media flow process in vaporizer 18, two recycle systems are mutually isolated, and transformer oil 2 and coolant media carry out thermal conduction by the sidewall (tube wall, wooden partition or shell wall) of transformer oil flow process in vaporizer 18.
In the present embodiment, described vaporizer 18 is coil tube type, and namely transformer oil flow process is the Guan Cheng of coil tube type, and coolant media flow process is the shell side of coil tube type. Certainly, described vaporizer 18 can also be any one wherein such as shell and tube, board-like, jacketed type: when vaporizer 18 is for shell and tube, then transformer oil flow process is the Guan Cheng of shell and tube, and coolant media flow process is the shell side of shell and tube; When vaporizer 18 is board-like, then transformer oil flow process is oil stream plate groove group, and coolant media flow process is refrigerant plate groove group, and each refrigerant plate groove of described refrigerant plate groove group is overlapping with each oil stream plate groove of oil stream plate groove group; When vaporizer 18 is jacketed type, it is possible to using main transformer body 21 inner chamber as transformer oil flow process, on main transformer body 21 shell, weld clip cover is as coolant media flow process.
In the present embodiment, described control module can be PLC, the computer processor of micro-chip or other form, described control module comprises Signal reception unit, analytic operation unit and actuator unit, after described reception unit receives the temperature signal that in the main transformer winding 1 and main transformer that sensing device (temperature sensor) sends, transformer oil 2 is respective, carry out intelligence real-time analysis computing by analytic operation unit and send steering order, described actuator unit can automatically control the work of refrigeration system according to steering order in different main transformer load sections, the internal circulating load of automatic controlled cooling model oil, to ensure that main transformer can run under the temperature difference of optimum with cooling oil stream in different load section.
As shown in Fig. 1 ~ 5, a kind of main transformer winding and the optimum intelligent control method of the oil stream temperature difference, adopt the optimum intelligent control system of main transformer winding as above with the oil stream temperature difference, and carry out according to the following steps:
(1) opening the hot oily fuel-displaced valve 5 in circulation of oil flow system, cold oil fuel charging valve 11, the transformer oil flow process 9 of vaporizer and frequency conversion oil pump 6, now transformer oil 2 starts to circulate;
(2) open the condenser 14 in frequency changing refrigeration system, throttling valve 17, the coolant media flow process 19 of vaporizer and Refrigerating Compressor with Inverter 12, start refrigeration work;
(3) control module is opened, main transformer winding temperature measurement on-line device 3 and transformer oil temperature measurement on-line device 4 measure the oil stream temperature in main transformer winding 1 temperature and main transformer body 21 respectively in real time, the online temperature data that main transformer winding temperature measurement on-line device 3 and transformer oil temperature measurement on-line device 4 transmit is changed into numerary signal by sensing device respectively, two groups of numerary signals that control module transmits according to sensing device carry out intellectual analysis computing, and send different instruction according to different load section and Refrigerating Compressor with Inverter 12 and frequency conversion oil pump 6 are carried out intelligent control, run under making main transformer winding 1 and oil stream temperature remain at optimum temperature difference state.
In step (2), the operation method of described frequency changing refrigeration system is as follows: open Refrigerating Compressor with Inverter 12, and Refrigerating Compressor with Inverter 12 becomes high pressure-temperature cold media gas by from the low pressure refrigerant gas compression out of the coolant media flow process 19 of vaporizer; High pressure-temperature cold media gas after Refrigerating Compressor with Inverter 12 compresses enters in condenser 14, forces quenching by cooling blower 15, high pressure-temperature cold media gas is condensed into high temperature refrigerant liquid; High temperature refrigerant liquid is a large amount of in the coolant media flow process 19 of vaporizer after throttling valve 17 expenditure and pressure is lowered the temperature to be absorbed the heat of heat transformer oil 2 in transformer oil flow process and flashes to low pressure refrigerant gas, low pressure refrigerant gas is delivered to again in Refrigerating Compressor with Inverter 12 to compress, with this iterative cycles.
In step (2), it flow to the coolant media flow process 19 of vaporizer through throttling valve 17 from condenser 14 high temperature refrigerant liquid out, now part high temperature refrigerant liquid is caused to be changed into low pressure refrigerant gas owing to sudden volume expands, liquid flash in the process of gas can a large amount of heat absorption and other high temperature refrigerant fluid temperature is sharply declined, in the transformer oil flow process 9 of low temperature refrigerant liquid after temperature decrease and vaporizer, the heat transformer oil of flowing flows through sidewall and carries out heat exchange, low pressure refrigerant gas is all flashed to after heat absorption, and it is back to Refrigerating Compressor with Inverter 12, carry out next rotation thermal cycling.
In step (3), when main transformer operating load is big, when winding 1 temperature raises, control module controls Refrigerating Compressor with Inverter 12 frequency automatically to be increased, and increase is exerted oneself, and the frequency of control frequency conversion oil pump 6 increases automatically simultaneously, increases circulation of oil flow amount; When main transformer operating load reduces, during winding 1 decrease in temperature, on the contrary above automatic control; When winding 1 temperature with oil stream temperature difference in setting range time, Refrigerating Compressor with Inverter 12 stops work, frequency conversion oil pump 6 with minimum load run (can be multiple stage frequency conversion oil pump 6 only opens one in turn and with minimum load run).
Not stating part in the embodiment of the present invention is prior art, and the foregoing is only the better embodiment of the present invention, and all impartial changes done according to the present patent application patent scope, with modifying, all should belong to the covering scope of the present invention.
Claims (3)
1. a main transformer winding and the oily optimum intelligent control method flowing the temperature difference, it is characterized in that: adopt the optimum intelligent control system of main transformer winding with the oil stream temperature difference, described main transformer winding comprises circulation of oil flow system with the optimum intelligent control system of the oil stream temperature difference, frequency changing refrigeration system, main transformer winding temperature measurement on-line device, transformer oil temperature measurement on-line device, sensing device and control module, described circulation of oil flow system comprises main transformer body, cold oil fuel charging valve, the oily fuel-displaced valve of heat, the transformer oil flow process of frequency conversion oil pump and vaporizer, the transformer oil cooled by winding it is loaded with in described main transformer body, described frequency changing refrigeration system comprises coolant media, Refrigerating Compressor with Inverter, condenser, the coolant media flow process of throttling valve and vaporizer, described transformer oil circulates in vaporizer and carries out heat exchange with coolant media, described coolant media is SF6Described main transformer winding temperature measurement on-line device and transformer oil temperature measurement on-line device are installed on main transformer body, described main transformer winding temperature measurement on-line device and transformer oil temperature measurement on-line device are electrically connected at sensing device, and described sensing device, frequency conversion oil pump and Refrigerating Compressor with Inverter are electrically connected at control module; Described cold oil fuel charging valve is arranged on the cold oil ingress on main transformer body top, the oily fuel-displaced valve of described heat is arranged on the hot oil outlet place of main transformer body bottom, heat transformer oil is delivered to the transformer oil flow process of vaporizer by described oil pump from hot oil outlet, the coolant media that described heat transformer oil is enclosed in the coolant media flow process of vaporizer around transformer oil flow process is back in main transformer body from cold oil import after cooling; The coolant media flow process outlet of described vaporizer connects the import of Refrigerating Compressor with Inverter, and the outlet of described Refrigerating Compressor with Inverter connects the import of condenser, and the outlet of described condenser connects the coolant media flow process import of vaporizer by throttling valve; And carry out according to the following steps:
(1) opening the hot oily fuel-displaced valve in circulation of oil flow system, cold oil fuel charging valve, the transformer oil flow process of vaporizer and frequency conversion oil pump, now transformer oil starts to circulate;
(2) open the condenser in frequency changing refrigeration system, throttling valve, the coolant media flow process of vaporizer and Refrigerating Compressor with Inverter, start refrigeration work; The operation method of described frequency changing refrigeration system is as follows: open Refrigerating Compressor with Inverter, and Refrigerating Compressor with Inverter becomes high pressure-temperature cold media gas by from the low pressure refrigerant gas compression out of the coolant media flow process of vaporizer; High pressure-temperature cold media gas after Refrigerating Compressor with Inverter compresses enters in condenser, forces quenching by cooling blower, high pressure-temperature cold media gas is condensed into high temperature refrigerant liquid; High temperature refrigerant liquid through throttling valve to the coolant media flow process of vaporizer, now part high temperature refrigerant liquid is caused to be changed into low pressure refrigerant gas owing to sudden volume expands, liquid flash in the process of gas can a large amount of heat absorption and other high temperature refrigerant fluid temperature is sharply declined, low temperature refrigerant liquid after temperature decrease and in the transformer oil flow process of vaporizer the heat transformer oil of flowing flow through sidewall and carry out heat exchange, low pressure refrigerant gas is all flashed to after heat absorption, low pressure refrigerant gas is delivered to again in Refrigerating Compressor with Inverter to compress, with this iterative cycles;
(3) control module is opened, main transformer winding temperature measurement on-line device and transformer oil temperature measurement on-line device measure the oil stream temperature in main transformer winding temperature and main transformer body respectively in real time, the online temperature data that main transformer winding temperature measurement on-line device and transformer oil temperature measurement on-line device transmit is changed into numerary signal and sends control module to by sensing device respectively, two groups of numerary signals that control module transmits according to sensing device carry out intellectual analysis computing, and send different instruction according to different load section and Refrigerating Compressor with Inverter and frequency conversion oil pump are carried out intelligent control, run under making main transformer winding and oil stream temperature remain at optimum temperature difference state, when main transformer operating load is big, when winding temperature raises, control module controls Refrigerating Compressor with Inverter frequency automatically to be increased, and increase is exerted oneself, and the frequency of control frequency conversion oil pump increases automatically simultaneously, increases circulation of oil flow amount, when main transformer operating load reduces, when winding temperature reduces, on the contrary above automatic control, when winding temperature with oil stream temperature difference in setting range time, Refrigerating Compressor with Inverter stopping work, frequency conversion oil pump runs with minimum load.
2. main transformer winding according to claim 1 and oil flow the optimum intelligent control method of the temperature difference, it is characterised in that: described control module comprises Signal reception unit, analytic operation unit and actuator unit.
3. main transformer winding according to claim 1 and 2 and oil flow the optimum intelligent control method of the temperature difference, it is characterised in that: described control module is PLC or micro-chip.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104157401B (en) * | 2014-08-18 | 2017-04-12 | 国家电网公司 | Main transformer falling film type heat exchanging device with intelligent frequency conversion function and using method thereof |
| CN114739051A (en) * | 2014-09-09 | 2022-07-12 | 开利公司 | Cooler compressor oil regulation |
| CN104183363A (en) * | 2014-09-16 | 2014-12-03 | 国家电网公司 | Cooling device of main transformer radiator and using method |
| CN107967984A (en) * | 2017-10-26 | 2018-04-27 | 国网福建省电力有限公司莆田供电公司 | A kind of oil temperature oil circulating pump suitable for oil in transformer of electric substation case |
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| EP2104116B1 (en) * | 2008-03-12 | 2017-05-10 | ALSTOM Transport Technologies | Oil cooling system, particularly for transformers feeding traction electric motors, transformer with said system and method for determining the cooling fluid flow in a cooling system |
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