CN210467554U - Superconducting current-limiting transformer - Google Patents
Superconducting current-limiting transformer Download PDFInfo
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- CN210467554U CN210467554U CN201921711865.3U CN201921711865U CN210467554U CN 210467554 U CN210467554 U CN 210467554U CN 201921711865 U CN201921711865 U CN 201921711865U CN 210467554 U CN210467554 U CN 210467554U
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Abstract
The utility model relates to the technical field of transformers, and discloses a superconducting current-limiting transformer, which comprises a voltage transformation unit and a current limiter, wherein the voltage transformation unit comprises a transformer shell, an iron core and a coil sleeved on the iron core, the transformer shell is provided with an insulating core, a green plaster mud column is arranged in the insulating core in the middle, and an insulating layer and an epoxy resin layer are sequentially wrapped outside the green plaster mud column; the current limiter comprises a liquid nitrogen container, liquid nitrogen and a superconductor, wherein the liquid nitrogen is arranged in the liquid nitrogen container, the superconductor is fixed on an upper cover of the liquid nitrogen container and is immersed in the liquid nitrogen, and a conductive rod is arranged on the upper cover and is connected with the superconductor. The transformer can effectively inhibit short-circuit current, increase the insulativity of the transformer, reduce load consumption and heat loss, improve the working efficiency, realize sensitive superconductor induction and quick quench reaction, and effectively protect the transformer.
Description
Technical Field
The utility model relates to a transformer technical field especially relates to a superconductive current-limiting transformer.
Background
The transformer outage can cause the surge, and voltage can rise at double, burns out equipment, has huge potential safety hazard. When the circuit is in short-circuit fault, the fault current exceeding the critical current of the superconducting element makes the superconducting element quench to generate a certain resistance, thereby playing the role of inhibiting the short-circuit current.
The insulation performance requirement of the transformer is high, and the general leakage can cause huge risks and accidents.
The heat radiator of the transformer is generally low in conversion efficiency, and the technical problems of refrigeration and insulation are always solved. The load energy consumption of a general transformer is very high, and a general superconducting coil is placed in a low-temperature environment, but the no-load loss of the transformer can be increased, the heat loss is increased, and the efficiency of the transformer is reduced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve above-mentioned technical problem, the technical scheme of adoption is:
a superconducting current-limiting transformer comprises a voltage transformation unit and a current limiter, wherein the voltage transformation unit comprises a transformer shell, an iron core and a coil sleeved on the iron core, the transformer shell is provided with an insulating core, a green plaster column is arranged in the middle inside the insulating core, and an insulating layer and an epoxy resin layer are sequentially wrapped outside the green plaster column; the current limiter comprises a liquid nitrogen container, liquid nitrogen in the liquid nitrogen container and a superconductor immersed in the liquid nitrogen, the liquid nitrogen container is provided with two conducting rods, the conducting rods are provided with immersion ends immersed in the liquid nitrogen and connecting ends arranged outside the liquid nitrogen container, and the superconductor is connected with the immersion ends of the two conducting rods; the wire is arranged between the immersion ends of the two conducting rods and connected with the superconductor in parallel, a section of the superconductor is sleeved with a heat-conducting insulating elastic rubber sleeve, and a section of the wire is wound on the heat-conducting insulating elastic rubber sleeve at intervals.
When a large current passes through the superconducting element, the temperature rises, the superconductor is quenched, the current is dispersed through the conductor, large-area power failure is avoided, and the short-circuit current is effectively inhibited.
The coil is separated from the low-temperature environment, so that the load energy consumption of the transformer is low, the heat loss is reduced, and the working efficiency of the transformer is improved. The coil is made of common metal, is not a superconducting coil, and is expensive and high in cost. The superconductor of the utility model is in the current limiter and separated from the transformation unit, and the current limiter is connected with the transformation unit; when a circuit fault short circuit occurs in the transformation unit or the transformer, larger current is generated, the wire generates heat, so that the superconductor is quenched and becomes a normal resistor to share the current, and the phenomenon that the current of equipment is too large and danger occurs is prevented.
The wire is wound on the superconductor, the wire and the superconductor are in insulation connection, a circuit is short-circuited or damaged, the wire generates heat, and the heat can be directly conducted to the superconductor, so that the superconductor is quenched. The superconductor is sensitive in induction and quick in response.
The insulating core is a connecting wire end and is the most easy part for electric leakage, the electric leakage of the transformer can cause unexpected loss, and the insulating core increases the insulativity and the high temperature resistance of the transformer. The safety is improved.
Further, the flow restrictor further comprises a liquid nitrogen circulating device, and the liquid nitrogen circulating device comprises a case, a compressor arranged in the case, a liquid nitrogen compression pipe connected with the compressor and a cooling pipe.
Further, the liquid nitrogen compression pipe is communicated with a nitrogen extraction port of the upper cover of the liquid nitrogen container, and the cooling pipe is provided with a liquid nitrogen reduction inlet communicated with the liquid nitrogen container. And recycling the liquid nitrogen.
Further, the flow restrictor further comprises a liquid nitrogen return tank communicated with the liquid nitrogen container, the liquid nitrogen return tank comprises a shell, a drying chamber and a liquefying chamber, and the drying chamber and the liquefying chamber are arranged in the shell and are communicated with each other.
Furthermore, the liquid nitrogen backflow box is connected with a first pipeline through the upper cover of the liquid nitrogen container, and is connected with a second pipeline through the lower cover of the liquid nitrogen container.
Liquid nitrogen is an industrial refrigerant with ideal effect. The vaporization of the liquid nitrogen needs to absorb a large amount of heat, so that the heat generated by quench of the superconducting element is absorbed, the heat is eliminated in a short time, and the cooling effect is achieved.
The liquid nitrogen reflux box can recycle liquid nitrogen, so that the cost is saved. When the gaseous nitrogen circulates, the water is absorbed, the purity is improved, and the cooling effect is improved.
Further, the drying chamber comprises an inlet pipe, a drying layer, a circulation layer and an outlet pipe in sequence, wherein the drying layer and the circulation layer are arranged alternately.
Furthermore, the lower end of the drying chamber is provided with a water accumulation area. The drying chamber is detachably connected, and the water accumulation area is used for draining water.
Further, the liquefaction chamber is provided with a booster pump.
Furthermore, a display screen, a control button and a handle are arranged on the shell. The display screen displays the temperature, pressure and current parameters of the liquid nitrogen reflux box.
Furthermore, an insulating umbrella skirt is arranged on the outer side of the insulating core. Fire prevention, fire retardation, insulation, high temperature resistance and the like.
Compared with the prior art, the utility model discloses following beneficial effect has: the superconducting power transformer has the advantages that short-circuit current is effectively restrained, the insulativity of the transformer is increased, load consumption and heat loss are reduced, the working efficiency is improved, superconductor induction is sensitive, quench reaction is rapid, and the transformer is effectively protected.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a side view of the present invention.
FIG. 3 is a schematic view of the construction of the induction core.
FIG. 4 is a schematic diagram of another embodiment of a flow restrictor in combination with a liquid nitrogen return tank.
FIG. 5 is a schematic side view of a liquid nitrogen container.
Fig. 6 is a schematic view of the winding of a superconductor with a wire.
FIG. 7 is a schematic view of a liquid nitrogen reflux box.
FIG. 8 is a schematic view of the internal structure of a liquid nitrogen reflux box.
Fig. 9 is a schematic view of the structure of the drying chamber.
In the figure: the device comprises a transformation unit 1, a current limiter 2, an insulating core 3, a green plaster column 4, an insulating layer 5, an epoxy resin layer 6, a liquid nitrogen container 7, liquid nitrogen 8, a superconductor 9, a conducting rod 10, an immersion end 11, a connecting end 12, a conducting wire 13, a heat-conducting insulating elastic rubber sleeve 14, a case 15, a compressor 16, a liquid nitrogen compression pipe 17, a cooling pipe 18, a nitrogen extraction port 19, a liquid nitrogen reduction inlet 20, a liquid nitrogen return box 21, a shell 22, a drying chamber 23, a liquefaction chamber 24, a first pipeline 25, a second pipeline 26, an inlet pipe 27, a drying layer 28, a circulation layer 29, an outlet pipe 30, a water accumulation area 31, a booster pump 32, a display screen 33, a control button 34, a handle 35 and an insulating umbrella skirt 36.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and embodiments, wherein the positional relationship described herein is consistent with the positional relationship of the drawings, and is for convenience of description only and does not limit the structure of the present invention.
The utility model relates to a superconductive current-limiting transformer, as shown in fig. 1, 2 and 3, including vary voltage unit 1 and current limiter 2, vary voltage unit and current limiter set up from beginning to end. The transformation unit comprises a transformer shell, an iron core and a coil sleeved on the iron core, wherein the coil is a cylinder with an oval cross section and is wound on the iron core. The transformer shell is provided with four insulation cores 3, a green paste mud column 4 is arranged in the middle inside the insulation cores, an insulation layer 5 and an epoxy resin layer 6 are sequentially wrapped outside the green paste mud column, and an insulation umbrella skirt 30 is arranged outside the insulation cores. The insulating layer has high breakdown strength, low dielectric loss, relatively high insulation resistance, and stable insulation performance for a long time.
The flow restrictor is further provided with a case 15, a compressor 16 is arranged in the case, one end of the compressor 16 is connected with a cooling pipe 18, the other end of the compressor 16 is connected with a liquid nitrogen compression pipe 17, the liquid nitrogen compression pipe is communicated with three nitrogen extraction ports 19 of an upper cover of a liquid nitrogen container, and the cooling pipe is provided with a liquid nitrogen reduction inlet 20 communicated with the liquid nitrogen container. The evaporated nitrogen gas is discharged from the nitrogen gas extraction port, passes through the liquid nitrogen compression pipe, the compressor, the cooling pipe and the liquid nitrogen reduction inlet and returns to the liquid nitrogen container again. The product can be used repeatedly.
As shown in fig. 5 and 6, the restrictor comprises a liquid nitrogen container 7 provided with two conductive rods 10 having an immersion end 11 immersed in liquid nitrogen and a connection end 12 disposed outside the liquid nitrogen container, liquid nitrogen 8 inside the liquid nitrogen container and a superconductor 9 immersed in liquid nitrogen,
the connecting end is used for connecting a transformation unit or a transformer. The superconductor is connected with the immersion ends of the two conducting rods; a lead 13 is arranged between the immersion ends of the two conducting rods and is connected with the superconductor in parallel, a section of the superconductor is sleeved with a heat-conducting insulating elastic rubber sleeve 14, and a section of the lead is densely wound on the heat-conducting insulating elastic rubber sleeve at intervals. The wire is insulated from the superconductor. The wire directly transfers heat to the superconductor, so that the quenching effect is rapid and the sensitivity is high.
As shown in fig. 4 and 8, in another embodiment, the flow restrictor further comprises a liquid nitrogen return tank 21 communicating with the liquid nitrogen container, the liquid nitrogen return tank comprising a housing 22, a drying chamber 23 and a liquefaction chamber 24, the drying chamber and the liquefaction chamber being arranged within the housing and communicating with each other. The liquid nitrogen reflux box is connected with a first pipeline 25 with the upper cover of the liquid nitrogen container, and is connected with a second pipeline 26 with the lower cover of the liquid nitrogen container. The gaseous nitrogen absorbs moisture through the drying chamber, enters the liquefaction chamber, is liquefied into liquid nitrogen, and flows back to the liquid nitrogen container.
As shown in fig. 7 and 9, the drying chamber includes an inlet pipe 21, a drying layer 22, a flow-through layer 23, and an outlet pipe 24 in this order, the drying layer and the flow-through layer being alternately arranged. The lower end of the drying chamber is provided with a water accumulation area 25. The collected moisture can automatically accumulate in the stagnant zone. The liquefaction chamber is provided with a booster pump 26 to increase the fluidity of the circulation system. A display screen 27, control buttons 28 and a handle 29 are provided on the housing.
The present invention is not limited to the above-described embodiments, and various changes can be made without departing from the gist of the present invention within the scope of knowledge possessed by a person skilled in the art.
Claims (10)
1. A superconducting current limiting transformer, characterized by: the transformer comprises a transformation unit and a current limiter, wherein the transformation unit comprises a transformer shell, an iron core and a coil sleeved on the iron core, the transformer shell is provided with an insulating core, a green plaster mud column is arranged in the middle inside the insulating core, and an insulating layer and an epoxy resin layer are sequentially wrapped outside the green plaster mud column;
the current limiter comprises a liquid nitrogen container, liquid nitrogen in the liquid nitrogen container and a superconductor immersed in the liquid nitrogen, the liquid nitrogen container is provided with two conducting rods, the conducting rods are provided with immersion ends immersed in the liquid nitrogen and connecting ends arranged outside the liquid nitrogen container, and the superconductor is connected with the immersion ends of the two conducting rods;
the wire is arranged between the immersion ends of the two conducting rods and connected with the superconductor in parallel, a section of the superconductor is sleeved with a heat-conducting insulating elastic rubber sleeve, and a section of the wire is wound on the heat-conducting insulating elastic rubber sleeve at intervals.
2. The superconducting current-limiting transformer of claim 1, wherein: the flow restrictor further comprises a liquid nitrogen circulating device, and the liquid nitrogen circulating device comprises a case, a compressor arranged in the case, a liquid nitrogen compression pipe connected with the compressor and a cooling pipe.
3. The superconducting current-limiting transformer of claim 2, wherein: the liquid nitrogen compression pipe is communicated with a nitrogen extraction port of the upper cover of the liquid nitrogen container, and the cooling pipe is provided with a liquid nitrogen reduction inlet communicated with the liquid nitrogen container.
4. The superconducting current-limiting transformer of claim 1, wherein: the flow restrictor further comprises a liquid nitrogen return box communicated with the liquid nitrogen container, the liquid nitrogen return box comprises a shell, a drying chamber and a liquefying chamber, and the drying chamber and the liquefying chamber are arranged in the shell and are communicated with each other.
5. The superconducting current-limiting transformer of claim 4, wherein: the liquid nitrogen backflow box is connected with a first pipeline through the upper cover of the liquid nitrogen container, and is connected with a second pipeline through the lower cover of the liquid nitrogen container.
6. The superconducting current-limiting transformer of claim 4, wherein: the drying chamber comprises an inlet pipe, a drying layer, a circulation layer and an outlet pipe in sequence, wherein the drying layer and the circulation layer are arranged alternately.
7. The superconducting current-limiting transformer of claim 4, wherein: the lower end of the drying chamber is provided with a water accumulation area.
8. The superconducting current-limiting transformer of claim 4, wherein: the liquefaction chamber is provided with a booster pump.
9. The superconducting current-limiting transformer of claim 4, wherein: the shell is provided with a display screen, a control button and a handle.
10. The superconducting current-limiting transformer of claim 1, wherein: and an insulating umbrella skirt is arranged on the outer side of the insulating core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921711865.3U CN210467554U (en) | 2019-10-14 | 2019-10-14 | Superconducting current-limiting transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921711865.3U CN210467554U (en) | 2019-10-14 | 2019-10-14 | Superconducting current-limiting transformer |
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| CN210467554U true CN210467554U (en) | 2020-05-05 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110534322A (en) * | 2019-10-14 | 2019-12-03 | 浙江宝威电气有限公司 | A kind of superconducting current-limiting transformer |
| CN111899959A (en) * | 2020-07-19 | 2020-11-06 | 张晓卫 | Air-cooled energy-saving distribution transformer |
| WO2023182963A1 (en) * | 2022-03-22 | 2023-09-28 | T.C. Ankara Universitesi Rektorlugu | A superconductor protection unit |
-
2019
- 2019-10-14 CN CN201921711865.3U patent/CN210467554U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110534322A (en) * | 2019-10-14 | 2019-12-03 | 浙江宝威电气有限公司 | A kind of superconducting current-limiting transformer |
| CN111899959A (en) * | 2020-07-19 | 2020-11-06 | 张晓卫 | Air-cooled energy-saving distribution transformer |
| WO2023182963A1 (en) * | 2022-03-22 | 2023-09-28 | T.C. Ankara Universitesi Rektorlugu | A superconductor protection unit |
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