CN103390485A - Liquid nitrogen strong cooling transformer and refrigerating method thereof - Google Patents
Liquid nitrogen strong cooling transformer and refrigerating method thereof Download PDFInfo
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- CN103390485A CN103390485A CN2013103121889A CN201310312188A CN103390485A CN 103390485 A CN103390485 A CN 103390485A CN 2013103121889 A CN2013103121889 A CN 2013103121889A CN 201310312188 A CN201310312188 A CN 201310312188A CN 103390485 A CN103390485 A CN 103390485A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 296
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 148
- 239000007788 liquid Substances 0.000 title claims abstract description 137
- 238000001816 cooling Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000007789 gas Substances 0.000 claims abstract description 36
- 238000001704 evaporation Methods 0.000 claims abstract description 23
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 35
- 230000008020 evaporation Effects 0.000 claims description 19
- 238000000605 extraction Methods 0.000 claims description 19
- 238000009413 insulation Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000012774 insulation material Substances 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 239000011490 mineral wool Substances 0.000 claims description 4
- 229910001256 stainless steel alloy Inorganic materials 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000001351 cycling effect Effects 0.000 claims description 3
- 230000003252 repetitive effect Effects 0.000 claims description 3
- 238000009834 vaporization Methods 0.000 claims description 3
- 230000008016 vaporization Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 abstract description 122
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000010724 circulating oil Substances 0.000 abstract 1
- 238000004321 preservation Methods 0.000 abstract 1
- 239000002826 coolant Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010891 electric arc Methods 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 230000009965 odorless effect Effects 0.000 description 2
- -1 as everyone knows Substances 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001149 thermolysis Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
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Abstract
The invention relates to a liquid nitrogen strong cooling transformer and a refrigerating method thereof. The transformer comprises a transformer oil tank and a liquid nitrogen tank; the liquid nitrogen tank is connected with a liquid nitrogen outlet pipe; the transformer oil tank is connected with a gas nitrogen outlet pipe; an evaporating pipe is coiled in the transformer oil tank; one end of the evaporating pipe is communicated with the liquid nitrogen outlet pipe and the other end of the evaporating pipe is communicated with the gas nitrogen outlet pipe; the gas nitrogen outlet pipe is sequentially provided with a liquid nitrogen compressor, a condenser and a throttling valve; the tail end of the gas nitrogen outlet pipe extends into the liquid nitrogen tank; a temperature sensor is arranged in the transformer oil tank; and the liquid nitrogen outlet pipe is provided with a heat preservation electromagnetic valve electrically connected with the temperature sensor. The liquid nitrogen strong cooling transformer and the refrigerating method thereof have the beneficial effects that 1, heat exchange is carried out between liquid nitrogen and transformer oil, heat exchange efficiency is high and gas nitrogen is retransformed into liquid nitrogen by the liquid nitrogen compressor and the condenser and is recycled; and 2, the transformer oil in upper and lower cavities of the transformer oil tank is repeatedly circulated by a transformer oil circulating pipe and a circulating oil pump so as to enable the oil temperature to be balanced.
Description
Technical field
The invention belongs to transformer cooling system, especially relate to a kind of strong cold transformer of liquid nitrogen and refrigerating method thereof that utilizes the liquid nitrogen forced refrigeration.
Background technology
Transformer is electric equipment commonly used in productive life, mainly contains the functions such as lifting voltage, matched impedance and safety isolation.Divide by the type of cooling, transformer can be divided into dry-type transformer and oil-filled transformer, wherein, dry-type transformer is to rely on cross-ventilation to carry out that nature is cooling or to increase blower fan cooling, multiplex in small capacity transformers such as skyscraper, the electricity consumption of high speed toll station and localized lighting, electronic circuits; Oil-filled transformer is mainly to rely on oil to make coolant,, as modes such as oil, oil, oil immersed water cool, forced oil-circulation, reaches the purpose that reduces the transformer oil oil temperature.
The inner cored and winding coil of general transformer, for oil-filled transformer, transformer oil also is housed in transformer tank, and transformer oil adopts mineral insulating oil mostly, and main following several effects: 1) insulating effect: transformer oil has the dielectric strength more much higher than air.Insulating material is immersed in oil, not only can improve dielectric strength, but also can avoid the erosion of moisture; 2) thermolysis: the specific heat of transformer oil is large, is commonly used for cooling agent, and the heat that produces during the transformer operation rises the oily expanded by heating near iron core and winding, and by the convection current up and down of oil, heat sheds by radiator, guarantees that transformer normally moves; 3) extinguishing arc effect: on the on-load voltage regulating switch of oil circuit breaker and transformer, can produce electric arc during the contact switching.Due to the transformer oil good heat conductivity, and can divide and touch a large amount of gases under the high temperature action of electric arc, produce larger pressure, thereby improved the arc extinction performance of medium, electric arc is extinguished very soon.
in the heat radiation process, transformer oil can absorb amount of heat, if transformer oil is overheated, can affect the normal use of transformer, thereby also need to carry out cooling to transformer oil by other means, the conventional transformer cooling system is taked the water-cooled exchange more or is utilized the self cooling mode of fin oil circulation to carry out, but the cooling effectiveness of two kinds of types of cooling is all poor, a kind of water-cooled exchange transformer cooling system now is provided, as notification number be: a kind of water cooling transformer that the Chinese utility model of CN202917292U provides, described cooling device consists of the cavity plate, described cavity plate lower end is provided with water inlet tap, upper end is provided with faucet, the embedded encirclement of described cavity plate is arranged between primary coil and secondary coil in transformer body.this water-cooled transformer adopts the water-cooled exchange principle to reduce the oil temperature of transformer oil, but the critical temperature of water is higher, water at normal temperature is liquid, the heat of absorption and heat exchange is just less, heat absorption efficiency is poor, for guaranteeing cooling effectiveness, just need a large amount of aqueous waters, this has increased again production cost, extended cooling time, if reduce the temperature of water, as everyone knows, water will congeal into ice below zero degrees celsius, solid ice moves inconvenience, easily result in blockage, being not suitable as cooling agent uses, thereby there is certain limitation in the water-cooled exchange type of cooling.
Summary of the invention
The present invention be mainly high for the existing cost of the existing transformer oil water-cooled exchange type of cooling, heat exchanger effectiveness is low, the problem that cooling time is long, provide a kind of and can be recycled, cost is lower, heat exchanger effectiveness is high, the strong cold transformer of liquid nitrogen and refrigerating method thereof that cooling time is short.
above-mentioned technical problem of the present invention is mainly solved by following technical proposals: the strong cold transformer of a kind of liquid nitrogen, comprise the oil tank of transformer that transformer oil is housed, be provided with iron core in oil tank of transformer, iron core is externally connected to the Transformer Winding coil, it also comprises the liquid nitrogenous hood that liquid nitrogen is housed, be connected with the liquid nitrogen extraction tube on liquid nitrogenous hood, be connected with gas nitrogen outlet on oil tank of transformer, along the cabinet wall coiling, evaporation tube is arranged in oil tank of transformer, one end of evaporation tube is communicated with the liquid nitrogen extraction tube, the other end is communicated with gas nitrogen outlet, be provided with successively the liquid nitrogen compressor on gas nitrogen outlet, condenser and choke valve, the end of gas nitrogen outlet stretches into the inside of liquid nitrogenous hood, be provided with temperature inductor in oil tank of transformer, the liquid nitrogen extraction tube is provided with the insulation electromagnetically operated valve that is electrically connected to temperature inductor.The present invention, by conventional aqueous water, is replaced with liquid nitrogen with coolant, because the temperature of liquid nitrogen is spent subzero-196, boiling point-195.8 degree, critical temperature-147 degree, critical pressure 3.39Mpa, compare with aqueous water, liquid nitrogen has very low temperature, can better absorb heat in cooling procedure, heat exchanger effectiveness is higher, and cooling time is short, in addition the characteristic of liquid nitrogen be colorless and odorless, nonflammable, can not explode, be the more satisfactory coolant of transformer oil.The effect of insulation electromagnetically operated valve is when temperature inductor measures the temperature of setting, automatically opens the insulation electromagnetically operated valve, and liquid nitrogen flows into oil tank of transformer, to transformer oil in oil tank of transformer, carries out cooling.The oil tank of transformer bottom arranges the evaporation tube that consists of a circle copper pipe, the outlet of evaporation tube is identical with the direction of entrance, the outlet of evaporation tube is located at the top of oil tank of transformer, the outlet of evaporation tube is communicated with the liquid nitrogen extraction tube, the entrance of evaporation tube is communicated with gas nitrogen outlet, access finally the liquid nitrogen compressor, gas after the liquid gasification is sucked compressor, enter condenser after compressed machine compression, condenser is to the choke valve that consists of thin copper pipe is set between liquid nitrogenous hood, make gaseous nitrogen be reduced to liquid nitrogen and enter liquid case, enter next cool cycles.
Above-mentioned technical problem of the present invention is solved by following technical proposals simultaneously: the cooling means of the strong cold transformer of a kind of liquid nitrogen, comprise following use procedure: a), according to the serviceability temperature of transformer oil, the predetermined value of design temperature inductor, after transformer oil the temperature inside the box reaches preset temperature, the temperature inductor transmitted signal, after receiving signal, insulation electromagnetically operated valve, liquid nitrogen compressor and condenser start simultaneously; B), the liquid nitrogen in liquid nitrogenous hood flows into the liquid nitrogen extraction tube, and enters in evaporation tube, the liquid nitrogen in evaporation tube absorbs the heat of transformer oil, vaporization reaction occurs also be converted into gaseous nitrogen; C), gaseous nitrogen enters the liquid nitrogen compressor by gas nitrogen outlet, enters after compression condenser cooling again, gaseous nitrogen is reduced to liquid nitrogen, and through choke valve, enters in liquid nitrogenous hood; D), repeat above a, b, three steps of c, the liquid nitrogen repetitive cycling is utilized, until the oil temperature in oil tank of transformer is in the temperature range of regulation.
As preferably, the outside of described oil tank of transformer is provided with the transformer oil circulation pipe, one end of transformer oil circulation pipe is communicated with the upper chamber of oil tank of transformer, and the other end is communicated with the lower cavity of oil tank of transformer, and the transformer oil circulation pipe is provided with oil circulating pump.Due to the evaporation tube of the liquid nitrogen bottom at oil tank of transformer, and the oil tank of transformer maximum temperature is at top of oil-tank, be in upper chamber, in order to reduce better the fuel tank bulk temperature, can be at the external transformer oil circulation pipe in fuel tank outside, keep the transformer oil oil temperature in the cavity of up and down balanced, the transformer oil circulation pipe connects oil circulating pump, the circuit of oil circulating pump is in parallel with the insulation electromagnetically operated valve, after temperature inductor measures predetermined temperature, insulation electromagnetically operated valve and oil circulating pump and compressor start simultaneously, and transformer cuts out when out of service simultaneously.
as preferably, the outside of described oil tank of transformer is provided with the transformer oil circulation pipe, one end of transformer oil circulation pipe is communicated with the upper chamber of oil tank of transformer, the other end is communicated with the lower cavity of oil tank of transformer, be connected with oil circulating pump on the transformer oil circulation pipe, oil circulating pump is opened with the insulation electromagnetically operated valve, under the effect of oil circulating pump, transformer oil in the oil tank of transformer upper chamber enters the lower cavity of oil tank of transformer by the transformer oil circulation pipe, transformer oil in lower cavity enters upper chamber, transformer oil iterative cycles in the cavity of up and down, keep oil temperature balanced.
As preferably, before liquid nitrogen poured, the liquid towards nitrogenous hood vacuumized.Vacuumize incoagulable gas and the moisture that can remove in casing or pipeline, improve refrigeration, can reduce the input of liquid nitrogen simultaneously, reduce production costs.Should, according to needs of production, determine the vacuum degree that vacuumizes.
As preferably, described gas nitrogen outlet is provided with triple valve, and wherein two valve ports are connected with gas nitrogen outlet, and the another one valve port is the unidirectional valve that is communicated with liquid nitrogenous hood.Affected by various factors, still there will be a small amount of gaseous nitrogen in liquid nitrogenous hood, can these gaseous nitrogens be discharged by unidirectional valve.
As preferably, the tank wall of liquid nitrogenous hood, gas nitrogen outlet and liquid nitrogen extraction tube or tube wall all have three layers, nexine and outerly by stainless steel alloy, make, and intermediate layer is filled with insulation material.Liquid nitrogenous hood, gas nitrogen outlet and liquid nitrogen extraction tube all are filled with insulation material, and insulation material can reduce the heat exchange in case or pipe and the external world, at utmost improves heat exchanger effectiveness.
As preferably, described insulation material is that mineral wool or water are cotton.Mineral wool or water Cottonopolis are insulation materials preferably, and cost is lower.
As preferably, described liquid nitrogenous hood is provided with the liquid nitrogen filling opening.The liquid nitrogen filling opening is used for pouring or regularly replacing liquid nitrogen.
1), liquid nitrogenous hood pours liquid nitrogen, by liquid nitrogen and transformer oil, carries out heat exchange therefore, the invention has the beneficial effects as follows:, heat exchanger effectiveness is high, reaches cooling purpose; 2), gaseous nitrogen is through liquid nitrogen compressor and condenser, again is converted into liquid nitrogen, and by choke valve, pours liquid nitrogenous hood, recycle; 3), oil tank of transformer passes through external transformer oil circulation pipe and oil circulating pump, the transformer oil iterative cycles in the cavity of up and down, the equilibrium of maintenance oil temperature.
Description of drawings
Accompanying drawing 1 is a kind of overall structure schematic diagram of the present invention;
Accompanying drawing 2 is the partial enlarged drawings at A place in accompanying drawing 1;
Accompanying drawing 3 is sectional drawings of liquid nitrogen extraction tube in the present invention.
Shown in figure: 1-oil tank of transformer, the liquid nitrogenous hood of 2-, 3-liquid nitrogen extraction tube, 4-gas nitrogen outlet, 5-evaporation tube, 6-liquid nitrogen compressor, 7-condenser, 8-choke valve, 9-temperature inductor, 10-insulation electromagnetically operated valve, 11-transformer oil circulation pipe, 12-oil circulating pump, 13-triple valve, 14-insulation material, 15-liquid nitrogen filling opening.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment:
as shown in Figure of description 1, the strong cold transformer of a kind of liquid nitrogen, comprise the oil tank of transformer 1 that transformer oil is housed, be provided with iron core in oil tank of transformer 1, iron core is externally connected to the Transformer Winding coil, it also comprises the liquid nitrogenous hood 2 that liquid nitrogen is housed, be connected with liquid nitrogen extraction tube 3 on liquid nitrogenous hood 2, be connected with gas nitrogen outlet 4 on oil tank of transformer 1, along the cabinet wall coiling, evaporation tube 5 is arranged in oil tank of transformer 1, evaporation tube 5 is positioned at the bottom of oil tank of transformer 1, one end of evaporation tube 5 is communicated with liquid nitrogen extraction tube 3, the other end is communicated with gas nitrogen outlet 4, be provided with successively liquid nitrogen compressor 6 on gas nitrogen outlet 4, condenser 7 and choke valve 8, the end of gas nitrogen outlet 4 stretches into the inside of liquid nitrogenous hood 2, be provided with temperature inductor 9 in oil tank of transformer 1, temperature inductor 9 is transducer, liquid nitrogen extraction tube 3 is provided with the insulation electromagnetically operated valve 10 that is electrically connected to temperature inductor 9, the outside of oil tank of transformer 1 is provided with transformer oil circulation pipe 11, one end of transformer oil circulation pipe 11 is communicated with the upper chamber of oil tank of transformer 1, the other end is communicated with the lower cavity of oil tank of transformer 1, transformer oil circulation pipe 11 is provided with oil circulating pump 12, oil circulating pump 12 is electrically connected to insulation electromagnetically operated valve 10, gas nitrogen outlet 4 is provided with triple valve 13, wherein two valve ports are connected with gas nitrogen outlet 4, the another one valve port is the unidirectional valve that is communicated with liquid nitrogenous hood 2, as shown in Figure of description 2, the tank wall of liquid nitrogenous hood 2 has three layers, nexine and skin are made by stainless steel alloy, intermediate layer is filled with insulation material 14, as shown in Figure of description 3, the tube wall of gas nitrogen outlet 4 and liquid nitrogen extraction tube 3 has three layers, nexine and skin are made by stainless steel alloy, intermediate layer is filled with insulation material 14, insulation material 14 is that mineral wool or water are cotton, liquid nitrogenous hood 2 is provided with liquid nitrogen filling opening 15.
The present invention, by conventional aqueous water, is replaced with liquid nitrogen with coolant, because the temperature of liquid nitrogen is spent subzero-196, boiling point-195.8 degree, critical temperature-147 degree, critical pressure 3.39Mpa, compare with aqueous water, liquid nitrogen has very low temperature, can better absorb heat in cooling procedure, heat exchanger effectiveness is higher, and cooling time is short, in addition the characteristic of liquid nitrogen be colorless and odorless, nonflammable, can not explode, be the more satisfactory coolant of transformer oil.
The cooling means of the strong cold transformer of this liquid nitrogen, comprise following use procedure, wherein the traffic direction of liquid nitrogen, gaseous nitrogen is as shown in the direction of arrow in Figure of description 1: a, according to the serviceability temperature of transformer oil, the predetermined value of design temperature inductor 9, after the interior temperature of oil tank of transformer 1 reaches preset temperature, temperature inductor 9 transmitted signals, after receiving signal, insulation electromagnetically operated valve 10, liquid nitrogen compressor 6 and condenser 7 start simultaneously; Liquid nitrogen in b, liquid nitrogenous hood 2 flows into liquid nitrogen extraction tube 3, and enters in evaporation tube 5, and the liquid nitrogen in evaporation tube 5 absorbs the heat of transformer oil, vaporization reaction occurs and be converted into gaseous nitrogen; C, gaseous nitrogen enter gas nitrogen outlet 4, and gaseous nitrogen stream, through triple valve 13, enters liquid nitrogen compressor 6, enter after compression condenser 7 cooling again, and gaseous nitrogen is reduced to liquid nitrogen, and through choke valve 8, enter in liquid nitrogenous hood 2; D, repeat above a, b, three steps of c, the liquid nitrogen repetitive cycling is utilized, until the oil temperature in oil tank of transformer 1 is in the temperature range of regulation.
At above-mentioned b, when the c step is carried out, oil circulating pump 12 can be opened with insulation electromagnetically operated valve 10, under the effect of oil circulating pump 12, transformer oil in oil tank of transformer 1 upper chamber enters the lower cavity of oil tank of transformer 1 by transformer oil circulation pipe 11, transformer oil in lower cavity enters upper chamber, transformer oil iterative cycles in the cavity of up and down, keep oil temperature balanced.
In the strong cold process of liquid nitrogen, affected by various factors, in liquid nitrogenous hood, a small amount of gaseous nitrogen may appear, at this moment can these gaseous nitrogens be discharged by unidirectional valve.In addition can be before liquid nitrogen pour, the liquid towards nitrogenous hood vacuumizes.Vacuumize incoagulable gas and the moisture that can remove in casing or pipeline, improve refrigeration, can reduce the input of liquid nitrogen simultaneously, reduce production costs.
Should be understood that this embodiment only is not used in and limits the scope of the invention for explanation the present invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
Claims (8)
1. strong cold transformer of liquid nitrogen, comprise the oil tank of transformer (1) that transformer oil is housed, oil tank of transformer is provided with iron core in (1), iron core is externally connected to the Transformer Winding coil, it is characterized in that, it also comprises the liquid nitrogenous hood (2) that liquid nitrogen is housed, be connected with liquid nitrogen extraction tube (3) on liquid nitrogenous hood (2), be connected with gas nitrogen outlet (4) on oil tank of transformer (1), along the cabinet wall coiling, evaporation tube (5) is arranged in oil tank of transformer (1), one end of evaporation tube (5) is communicated with liquid nitrogen extraction tube (3), the other end is communicated with gas nitrogen outlet (4), be provided with successively liquid nitrogen compressor (6) on gas nitrogen outlet (4), condenser (7) and choke valve (8), the end of gas nitrogen outlet (4) stretches into the inside of liquid nitrogenous hood (2), be provided with temperature inductor (9) in oil tank of transformer (1), liquid nitrogen extraction tube (3) is provided with the insulation electromagnetically operated valve (10) that is electrically connected to temperature inductor (9).
2. the strong cold transformer of a kind of liquid nitrogen according to claim 1, it is characterized in that, the outside of described oil tank of transformer (1) is provided with transformer oil circulation pipe (11), one end of transformer oil circulation pipe (11) is communicated with the upper chamber of oil tank of transformer (1), the other end is communicated with the lower cavity of oil tank of transformer (1), and transformer oil circulation pipe (11) is provided with oil circulating pump (12).
3. the strong cold transformer of a kind of liquid nitrogen according to claim 1 and 2, it is characterized in that, described gas nitrogen outlet (4) is provided with triple valve (13), and wherein two valve ports are connected with gas nitrogen outlet (4), and the another one valve port is the unidirectional valve that is communicated with liquid nitrogenous hood (2).
4. the strong cold transformer of a kind of liquid nitrogen according to claim 1 and 2, it is characterized in that, tank wall or the tube wall of liquid nitrogenous hood (2), gas nitrogen outlet (4) and liquid nitrogen extraction tube (3) all have three layers, and nexine and skin are made by stainless steel alloy, and intermediate layer is filled with insulation material (14).
5. the strong cold transformer of a kind of liquid nitrogen according to claim 4, is characterized in that, described insulation material (14) is that mineral wool or water are cotton.
6. the strong cold transformer of a kind of liquid nitrogen according to claim 3, is characterized in that, described liquid nitrogenous hood (2) is provided with liquid nitrogen filling opening (15).
7. the cooling means of the strong cold transformer of a kind of liquid nitrogen according to claim 1, is characterized in that, comprises following use procedure:
A), according to the serviceability temperature of transformer oil, the predetermined value of design temperature inductor (9), after the interior temperature of oil tank of transformer (1) reaches preset temperature, temperature inductor (9) transmitted signal, after receiving signal, insulation electromagnetically operated valve (10), liquid nitrogen compressor (6) and condenser (7) start simultaneously;
B), the liquid nitrogen in liquid nitrogenous hood (2) flows into liquid nitrogen extraction tube (3), and enters in evaporation tube (5), the liquid nitrogen in evaporation tube (5) absorbs the heat of transformer oil, vaporization reaction occurs also be converted into gaseous nitrogen;
C), gaseous nitrogen enters liquid nitrogen compressor (6) by gas nitrogen outlet (4), enters after compression condenser (7) cooling again, gaseous nitrogen is reduced to liquid nitrogen, and through choke valve (8), enters in liquid nitrogenous hood (2);
D), repeat above a, b, three steps of c, the liquid nitrogen repetitive cycling is utilized, until the oil temperature in oil tank of transformer (1) is in the temperature range of regulation.
8. the cooling means of the strong cold transformer of a kind of liquid nitrogen according to claim 7, the outside of described oil tank of transformer (1) is provided with transformer oil circulation pipe (11), one end of transformer oil circulation pipe (11) is communicated with the upper chamber of oil tank of transformer (1), the other end is communicated with the lower cavity of oil tank of transformer (1), be connected with oil circulating pump (12) on transformer oil circulation pipe (11), it is characterized in that, oil circulating pump (12) is opened with insulation electromagnetically operated valve (10), under the effect of oil circulating pump (12), the lower cavity that transformer oil in oil tank of transformer (1) upper chamber enters oil tank of transformer (1) by transformer oil circulation pipe (11), transformer oil in lower cavity enters upper chamber, transformer oil iterative cycles in the cavity of up and down, keep oil temperature balanced.
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| CN201310312188.9A CN103390485B (en) | 2013-07-22 | 2013-07-22 | A kind of strong cold transformer of liquid nitrogen and refrigerating method thereof |
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| CN201310312188.9A CN103390485B (en) | 2013-07-22 | 2013-07-22 | A kind of strong cold transformer of liquid nitrogen and refrigerating method thereof |
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| CN103779048B (en) * | 2014-02-19 | 2016-03-30 | 国家电网公司 | A kind of with SF 6for main transformer heat abstractor and the method for coolant media |
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| CN103794337A (en) * | 2014-02-19 | 2014-05-14 | 国家电网公司 | Main transformer shell and tube heat dissipation device and method with SF6 as refrigerant medium |
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| CN103811152B (en) * | 2014-02-19 | 2016-02-24 | 国家电网公司 | A kind of with SF 6for main transformer jacket type heat abstractor and the method for coolant media |
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