CN103824677A - Optimal intelligent control system and control method of main transformer winding and oil flow temperature difference - Google Patents
Optimal intelligent control system and control method of main transformer winding and oil flow temperature difference Download PDFInfo
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- CN103824677A CN103824677A CN201410090969.2A CN201410090969A CN103824677A CN 103824677 A CN103824677 A CN 103824677A CN 201410090969 A CN201410090969 A CN 201410090969A CN 103824677 A CN103824677 A CN 103824677A
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Abstract
The invention relates to an optimal intelligent control system and a control method of a main transformer winding and an oil flow temperature difference. The control system comprises an oil flow circulation system, a variable frequency refrigerating system, a main transformer winding online temperature measuring system, a transformer oil online temperature measuring device, a sensing device and a control module; the oil flow circulation system comprises transformer oil, a main transformer body, a variable frequency oil pump and a transformer oil flow of an evaporator; the variable frequency refrigerating system comprises a coolant medium, a variable frequency refrigerating compressor and a coolant medium flow of the evaporator; the transformer oil circularly flows into the evaporator to be subjected to heat exchange with the coolant medium; the main transformer winding online temperature measuring device and the transformer oil online temperature measuring device are both arranged on the main transformer body and are both electrically connected to the sensing device; the sensing device, the variable frequency oil pump and the variable frequency refrigerating compressor are electrically connected to the control module. The optimal intelligent control system and the control method of the main transformer winding and the oil flow temperature difference have the advantages of safety, reliability, efficient operation, low energy consumption, less maintenance workload and the like and belongs to the revolutionary innovation of the main transformer operation.
Description
Technical field
The present invention relates to a kind of main transformer winding and oily optimum intelligent control system and the control method that flows the temperature difference.
Background technology
The cooling control mode of tradition main transformer operation is mainly that air blast cooling operation is controlled and two kinds of water-cooled operation controls, does not natural air cooledly have cooling control.Although the cooling operation control range of water-cool control is large, economical operation, efficiency are also high, if there is cooling water in cooling system to main transformer Seepage, even minor leakage also will cause serious consequence.Therefore, the cooling controlling run of existing most main transformers all adopts air blast cooling control mode, and air blast cooling control system because air heat content is low, have a narrow range of temperature, and be subject to the impact of ambient temperature, make main transformer cooling effectiveness low, it is very little that main transformer moves cooling control range, and adopt the main transformer of air blast cooling operational mode, has that equipment volume is huge, operation and a shortcomings such as manufacturing cost is high, many by oil mass, maintenance is large.
Main transformer is in service along with load increases, its winding current increases, the caloric value of winding also increases thereupon, now the stream of the oil in main transformer carries out cooling to winding, oil stream self is heated, and after cooling by external cooling control system, returns cooling winding in main transformer, moves in circles, to guarantee main transformer safe operation, otherwise main transformer will burn.Do not affecting under mobility status, oil temperature is lower more favourable to main transformer operation, but too low oil temperature can make operating cost significantly rise.Therefore, be necessary to design a kind of system and method that main transformer winding and oil stream temperature difference Intelligent Dynamic is controlled to optimal balance point.
Summary of the invention
In order to overcome the deficiencies in the prior art part, the object of the present invention is to provide a kind of safe and reliable, operation is efficient, energy consumption is low, maintenance work is few and optimum intelligent control system and the control method of the main transformer winding of economical operation and the oil stream temperature difference.
To achieve these goals, technical scheme one of the present invention is: a kind of main transformer winding and the oily optimum intelligent control system that flows the 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 inlet valve, deep fat delivery valve, the transformer oil flow process of frequency conversion oil pump and evaporator, is loaded with winding is carried out to cooling transformer oil in described main transformer body, and described frequency changing refrigeration system comprises coolant media, Refrigerating Compressor with Inverter, condenser, the coolant media flow process of choke valve and evaporator, described transformer oil circulates in evaporator 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 inlet valve is arranged on the cold oil import department on main transformer body top, described deep fat delivery valve is arranged on the hot oil outlet place of main transformer body bottom, described oil pump is delivered to heat transformer oil the transformer oil flow process of evaporator from hot oil outlet, described heat transformer oil in the coolant media flow process of evaporator, be enclosed in transformer oil flow process coolant media around cooling after, from cold oil circumfluence in main transformer body.
Further, the coolant media flow process outlet of described evaporator 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 evaporator by choke valve.
Further, described control module comprises signal receiving unit, analytic operation unit and performance element.
Further, described control module is PLC or single-chip microcomputer.
To achieve these goals, technical scheme two of the present invention is: a kind of main transformer winding and the oily optimum intelligent control method that flows the temperature difference, adopt the optimum intelligent control system of main transformer winding as above and the oil stream temperature difference, and carry out according to the following steps:
(1) transformer oil flow process and the frequency conversion oil pump of the deep fat delivery valve in unlatching circulation of oil flow system, cold oil inlet valve, evaporator, now transformer oil starts to circulate;
(2) coolant media flow process and the Refrigerating Compressor with Inverter of the condenser in unlatching frequency changing refrigeration system, choke valve, evaporator, start refrigeration work;
(3) open control module, main transformer winding temperature measurement on-line device and transformer oil temperature measurement on-line device are measured respectively the oil stream temperature in main transformer winding temperature and main transformer body in real time, the online temperature data that sensing device transmits main transformer winding temperature measurement on-line device and transformer oil temperature measurement on-line device changes respectively digital signal into and sends control module to, two groups of digital signals that control module transmits according to sensing device are carried out intellectual analysis computing, and send different instruction according to different load section Refrigerating Compressor with Inverter and frequency conversion oil pump are carried out to Based Intelligent Control, make main transformer winding remain under optimum temperature difference state and move with oil stream temperature.
Further, in step (3), when main transformer operating load is large, when winding temperature raises, control module is controlled Refrigerating Compressor with Inverter frequency automatically to be increased, and increase is exerted oneself, and the frequency of simultaneously automatically controlling frequency conversion oil pump increases, and increases circulation of oil flow amount; When main transformer operating load reduces, when winding temperature reduces, on the contrary above automatic control; In the time that the difference of winding temperature and oil stream temperature is in setting range, Refrigerating Compressor with Inverter quits work, and frequency conversion oil pump is with minimum load operation.
Compared with prior art, the present invention has following beneficial effect: owing to adopting intelligent frequency-conversion dynamically to control, cooling control range is large, realize 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 the operation of main transformer high-efficiency environment friendly, and more safe and reliable, and can reduce device fabrication cost and equipment volume, minimizing oil mass, extend main transformer useful life and reduce the advantages such as maintenance, it is the revolutionary character innovation of main transformer manufacture and operational mode, compare with operational mode 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 the schematic diagram that is cooled in transformer oil.
Fig. 2 is the transformer oil stream cool cycles 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 Based Intelligent Control workflow schematic diagram of the oil stream temperature difference.
Fig. 5 is that the control module of the embodiment of the present invention is controlled main transformer winding and the optimum temperature difference operation logic block diagram of 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, 5-deep fat delivery valve, 6-frequency conversion oil pump, 7-frequency conversion oil pump outlet valve, 8-oil flows to the transformer oil flow process of evaporator, the transformer oil flow process of 9-evaporator, 10-oil flows out the transformer oil flow process of evaporator, 11-cold oil inlet valve, 12-Refrigerating Compressor with Inverter, 13-condenser inlet, 14-condenser, 15-cooling blower, 16-condensator outlet, 17-choke valve, 18-evaporator, the coolant media flow process of 19-evaporator, 20-coolant media goes out the flow process of evaporator 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 oily optimum intelligent control system that flows the 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 inlet valve 11, deep fat delivery valve 5, the transformer oil flow process 9 of frequency conversion oil pump 6 and evaporator, is loaded with winding 1 is carried out to cooling transformer oil 2 in described main transformer body 21, and described frequency changing refrigeration system comprises coolant media, Refrigerating Compressor with Inverter 12, condenser 14, the coolant media flow process 19 of choke valve 17 and evaporator, described transformer oil 2 circulates in evaporator 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 inlet valve 11 is arranged on the cold oil import department on main transformer body 21 tops, described deep fat delivery valve 5 is arranged on the hot oil outlet place of main transformer body 21 bottoms, the outlet of described frequency conversion oil pump 6 is provided with frequency conversion oil pump outlet valve 7, the heat that the cooling main transformer winding 1 of described transformer oil 2 produces due to the function of current, main transformer load is higher, and the electric current that its winding 1 passes through is also larger, caloric value is larger, and vice versa; Described oil pump is delivered to heat transformer oil 2 the transformer oil flow process 9 of evaporator from hot oil outlet, described heat transformer oil 2 in the coolant media flow process 19 of evaporator, be enclosed in transformer oil flow process coolant media around cooling after, from cold oil circumfluence in main transformer body, oil stream by predetermined amount of flow and temperature carrys out cooling main transformer winding 1, make winding 1 keep an optimum temperature approach with cold oil stream all the time, realize main transformer and move with optimum.
In the present embodiment, coolant media flow process 19 outlets of described evaporator connect the import of 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 imports of evaporator by choke valve 17, described coolant media can be SF
6deng.Wherein, described condenser 14 is air-cooled condenser 14, forces quenching by cooling blower 15, and condenser 14 can also be water condenser 14 certainly, owing to being coolant media indirect heat exchange in condenser 14, therefore just in case cooling water seepage is also irrelevant etc. with main transformer oil stream.The transformer oil flow process 9 of described evaporator and coolant media flow process are two medium flow process parts of isolation mutually, transformer oil flow medium is walked transformer oil flow process in evaporator 18, coolant media is walked coolant media flow process in evaporator 18, two circulatory systems are isolated mutually, and transformer oil 2 and coolant media carry out heat conduction by the sidewall (tube wall, wooden partition or shell wall) of transformer oil flow process in evaporator 18.
In the present embodiment, described evaporator 18 is coiled, the tube side that transformer oil flow process is coiled, the shell side that coolant media flow process is coiled.Certainly, described evaporator 18 can also be wherein any such as shell and tube, board-like, jacket type: when evaporator 18 is during for shell and tube, and the tube side that transformer oil flow process is shell and tube, the shell side that coolant media flow process is shell and tube; When evaporator 18 is while being board-like, transformer oil flow process is oil stream board slot group, and coolant media flow process is refrigerant board slot group, and each refrigerant board slot of described refrigerant board slot group is overlapping with each oil stream board slot of oil stream board slot group; In the time that evaporator 18 is jacket type, can be using main transformer body 21 inner chambers as transformer oil flow process, on main transformer body 21 shells, weld clip cover is as coolant media flow process.
In the present embodiment, described control module can be PLC, the computer processor of single-chip microcomputer or other form, described control module comprises signal receiving unit, analytic operation unit and performance element, described receiving element receives in main transformer winding 1 that sensing device (temperature sensor) sends and main transformer after transformer oil 2 temperature signal separately, carry out intelligent real-time analysis computing and send control command by analytic operation unit, described performance element can carry out the work of nonstick system of control cooling system in different main transformer load sections according to control command, automatically control the internal circulating load of cold oil, to guarantee that main transformer can move with cold oil stream in different load section under the optimum temperature difference.
As shown in Fig. 1 ~ 5, a kind of main transformer winding and the oily optimum intelligent control method that flows the temperature difference, adopt the optimum intelligent control system of main transformer winding as above and the oil stream temperature difference, and carry out according to the following steps:
(1) transformer oil flow process 9 and the frequency conversion oil pump 6 of the deep fat delivery valve 5 in unlatching circulation of oil flow system, cold oil inlet valve 11, evaporator, now transformer oil 2 starts to circulate;
(2) coolant media flow process 19 and the Refrigerating Compressor with Inverter 12 of the condenser 14 in unlatching frequency changing refrigeration system, choke valve 17, evaporator, start refrigeration work;
(3) open control module, main transformer winding temperature measurement on-line device 3 and transformer oil temperature measurement on-line device 4 are measured respectively the oil stream temperature in main transformer winding 1 temperature and main transformer body 21 in real time, the online temperature data that sensing device transmits main transformer winding temperature measurement on-line device 3 and transformer oil temperature measurement on-line device 4 changes respectively digital signal into, two groups of digital signals that control module transmits according to sensing device are carried out intellectual analysis computing, and send different instruction according to different load section Refrigerating Compressor with Inverter 12 and frequency conversion oil pump 6 are carried out to Based Intelligent Control, make main transformer winding 1 remain under optimum temperature difference state and move with oil stream temperature.
In step (2), the operation method of described frequency changing refrigeration system is as follows: open Refrigerating Compressor with Inverter 12, the low pressure refrigerant gas compression out of the coolant media flow process 19 from evaporator is become high pressure-temperature cold media gas by Refrigerating Compressor with Inverter 12; High pressure-temperature cold media gas after Refrigerating Compressor with Inverter 12 compressions enters in condenser 14, forces quenching by cooling blower 15, and high pressure-temperature cold media gas is condensed into high temperature refrigerant liquid; High temperature refrigerant liquid absorbs the heat of heat transformer oil 2 in transformer oil flow processs in a large number in the coolant media flow process 19 at evaporator and flashes to low pressure refrigerant gas after choke valve 17 expenditure and pressure coolings, low pressure refrigerant gas is delivered to again compression in Refrigerating Compressor with Inverter 12, with this iterative cycles.
In step (2), flow to the coolant media flow process 19 of evaporator through choke valve 17 from condenser 14 high temperature refrigerant liquid out, now because causing part high temperature refrigerant liquid rotating, volume sudden enlargement becomes low pressure refrigerant gas, liquid evaporation becomes in the process of gas can a large amount of heat absorptions and other high temperature refrigerant fluid temperature is sharply declined, low temperature refrigerant liquid after temperature declines and the interior mobile heat transformer oil of the transformer oil flow process 9 of evaporator stream carry out heat exchange by sidewall, after heat absorption, all flash to low pressure refrigerant gas, and be back to Refrigerating Compressor with Inverter 12, carry out next round heat exchange circulation.
In step (3), when main transformer operating load is large, when winding 1 temperature raises, control module is controlled Refrigerating Compressor with Inverter 12 frequencies automatically to be increased, and increase is exerted oneself, and the frequency of simultaneously automatically controlling frequency conversion oil pump 6 increases, and increases circulation of oil flow amount; When main transformer operating load reduces, when winding 1 temperature reduces, on the contrary above automatic control; In the time that the difference of winding 1 temperature and oil stream temperature is in setting range, Refrigerating Compressor with Inverter 12 quits work, and frequency conversion oil pump 6 is with minimum load operation (can be only open in turn in many frequency conversion oil pumps 6 one and with minimum load operation).
In the embodiment of the present invention, do not state part for prior art, and 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 (7)
1. main transformer winding and an oily optimum intelligent control system that flows the temperature difference, is characterized in that: 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 inlet valve, deep fat delivery valve, the transformer oil flow process of frequency conversion oil pump and evaporator, is loaded with winding is carried out to cooling transformer oil in described main transformer body, and described frequency changing refrigeration system comprises coolant media, Refrigerating Compressor with Inverter, condenser, the coolant media flow process of choke valve and evaporator, described transformer oil circulates in evaporator 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.
2. main transformer winding according to claim 1 and the oily optimum intelligent control system that flows the temperature difference, it is characterized in that: described cold oil inlet valve is arranged on the cold oil import department on main transformer body top, described deep fat delivery valve is arranged on the hot oil outlet place of main transformer body bottom, described oil pump is delivered to heat transformer oil the transformer oil flow process of evaporator from hot oil outlet, described heat transformer oil in the coolant media flow process of evaporator, be enclosed in transformer oil flow process coolant media around cooling after, from cold oil circumfluence in main transformer body.
3. main transformer winding according to claim 1 and the oily optimum intelligent control system that flows the temperature difference, it is characterized in that: the coolant media flow process outlet of described evaporator connects the import of Refrigerating Compressor with Inverter, 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 evaporator by choke valve.
4. main transformer winding according to claim 1 and the oily optimum intelligent control system that flows the temperature difference, is characterized in that: described control module comprises signal receiving unit, analytic operation unit and performance element.
5. the optimum intelligent control system with the oil stream temperature difference according to the main transformer winding described in claim 1 or 4, is characterized in that: described control module is PLC or single-chip microcomputer.
6. main transformer winding and an oily optimum intelligent control method that flows the temperature difference, is characterized in that: adopt the main transformer winding as described in any one in claim 1 to 5 to flow the optimum intelligent control system of the temperature difference with oil, and carry out according to the following steps:
(1) transformer oil flow process and the frequency conversion oil pump of the deep fat delivery valve in unlatching circulation of oil flow system, cold oil inlet valve, evaporator, now transformer oil starts to circulate;
(2) coolant media flow process and the Refrigerating Compressor with Inverter of the condenser in unlatching frequency changing refrigeration system, choke valve, evaporator, start refrigeration work;
(3) open control module, main transformer winding temperature measurement on-line device and transformer oil temperature measurement on-line device are measured respectively the oil stream temperature in main transformer winding temperature and main transformer body in real time, the online temperature data that sensing device transmits main transformer winding temperature measurement on-line device and transformer oil temperature measurement on-line device changes respectively digital signal into and sends control module to, two groups of digital signals that control module transmits according to sensing device are carried out intellectual analysis computing, and send different instruction according to different load section Refrigerating Compressor with Inverter and frequency conversion oil pump are carried out to Based Intelligent Control, make main transformer winding remain under optimum temperature difference state and move with oil stream temperature.
7. main transformer winding according to claim 6 and the oily optimum intelligent control method that flows the temperature difference, it is characterized in that: in step (3), when main transformer operating load large, when winding temperature raises, control module is controlled Refrigerating Compressor with Inverter frequency automatically to be increased, increase is exerted oneself, and the frequency of simultaneously automatically controlling frequency conversion oil pump increases, and increases circulation of oil flow amount; When main transformer operating load reduces, when winding temperature reduces, on the contrary above automatic control; In the time that the difference of winding temperature and oil stream temperature is in setting range, Refrigerating Compressor with Inverter quits work, and frequency conversion oil pump is with minimum load operation.
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| CN104157401A (en) * | 2014-08-18 | 2014-11-19 | 国家电网公司 | Main transformer falling film type heat exchanging device with intelligent frequency conversion function and using method thereof |
| 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 |
| CN114739051A (en) * | 2014-09-09 | 2022-07-12 | 开利公司 | Cooler compressor oil regulation |
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| 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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