CN107800123B - Main insulation structure device and method of a vertical high temperature superconducting resistance current limiter - Google Patents

Abstract

The embodiment of the invention provides a kind of Main Insulation Structure of Electric device and method of vertical high-temperature superconduction resistance-type current restrictor.The device includes: outgoing line unit, superconduction resistance current limiting unit, low-temperature (low temperature) vessel, paper insulation and liquid nitrogen, two outgoing line units in center and connection that superconduction resistance current limiting unit is placed in inside device are drawn to outside device, low-temperature (low temperature) vessel is cylindrical structure, paper insulation is cylindrical structure, paper insulated outer diameter is identical as the internal diameter of low-temperature (low temperature) vessel, paper insulation is placed in the inside of low-temperature (low temperature) vessel, liquid nitrogen is placed between paper insulation and superconduction resistance current limiting unit, the composite insulation structure of liquid nitrogen and paper insulation composition, the common operating voltage and surge voltage for bearing high-temperature superconductor resistance-type current restrictor.The embodiment of the present invention can reduce the overall dimension of Main Insulation Structure of Electric device under the premise of meeting major insulation resistance to pressure request, reduce the equipment land occupation demand of superconductive current limiter, and improve the effective rate of utilization of liquid nitrogen.

Description

Main insulation structure device and method of a vertical high temperature superconducting resistance current limiter

technical field

The invention relates to the technical field of fault current limiters, in particular to a main insulation structure device and method for a vertical high temperature superconducting resistance current limiter.

Background technique

Resistive high temperature superconducting current limiter is a new type of fault current limiting equipment that utilizes the superconducting state-normal state rapid transition characteristics of high temperature superconductors. It has fast response speed, low normal operation loss, and integrates detection, triggering, current limiting and It is an ideal current-limiting technology and device development plan for power systems, with features such as the integration of automatic recovery functions, and has broad prospects and huge market demand potential.

The resistive superconducting current limiter utilizes the second-generation high-temperature superconducting tape-wound superconducting resistive current-limiting unit that has been commercially produced. The superconducting current limiting unit is arranged inside the cryogenic container filled with liquid nitrogen. On the one hand, liquid nitrogen is used as the refrigerant of the superconducting resistor current limiting unit to maintain the superconducting state of the superconductor; on the other hand, liquid nitrogen is also used as the main insulation of the superconducting current limiter to withstand the working voltage and impulse voltage of the system.

The insulation structure design with liquid nitrogen as the main insulation has relatively stable performance in the steady state operation of the superconducting current limiter. However, during the current limiting transient process of the superconducting current limiter, there is a risk of insulation failure. It is mainly reflected in: the fault current causes the superconducting resistor current-limiting unit to quench, and the current-limiting unit absorbs a large amount of fault current energy, which is transferred to the liquid nitrogen around the superconducting resistor current-limiting unit in a short time, causing the liquid nitrogen Vaporization eventually releases the energy in the form of nitrogen gas. Due to the large amount of nitrogen gas produced by the vaporization of liquid nitrogen, the main insulation of liquid nitrogen becomes a gas-liquid two-phase insulation. The existence of bubbles will cause local concentration of the electric field, which greatly increases the possibility of partial discharge. During the movement of the bubbles, there is also the possibility of connecting into a line, which will provide a channel for the discharge.

One method of using liquid nitrogen to design the main insulation in the prior art is: in order to ensure safety, design according to the insulation standard of nitrogen and leave a margin.

The disadvantage of using liquid nitrogen in the above-mentioned prior art for main insulation design is that although this design based on the worst case can meet the insulation requirements, due to the large margin, the resistance of the resistive superconducting current limiter The size of the Dewar is large, and the utilization rate of liquid nitrogen is low.

Contents of the invention

In order to solve the above-mentioned problems in the prior art, an embodiment of the present invention provides a main insulation structure device and method for a vertical high temperature superconducting resistance current limiter.

In order to achieve the above object, the present invention has taken the following technical solutions:

According to one aspect of the present invention, a main insulation structure device of a vertical high temperature superconducting resistance current limiter is provided, which is characterized in that it includes: an outlet unit, a superconducting resistance current limiting unit, a cryogenic container, paper insulation and liquid Nitrogen, the superconducting resistance current-limiting unit is placed in the center of the device and connected to the two outlet units, the outlet units lead out of the device, the paper insulation is placed inside the cryogenic container, the Liquid nitrogen is placed between the paper insulation and the superconducting resistor current limiting unit, and the composite insulation structure composed of the liquid nitrogen and the paper insulation can jointly withstand the working voltage and impact of the high temperature superconducting resistor type current limiter Voltage.

Preferably, the paper insulation is mechanically connected and fixed to the cryogenic container to prevent displacement of the paper insulation during operation.

Preferably, the paper insulation is a multi-layer concentric structure made of paper insulation materials, and the paper insulation is a cylindrical structure as a whole.

Preferably, the gaps between adjacent layers of the paper insulation materials are glued and filled into one entity by dipping as required, or the gaps are left without filling.

Preferably, the outer diameter of the paper insulation is the same as the inner diameter of the cryogenic vessel.

Preferably, said paper insulation material has good mechanical properties at low temperatures and good forming properties at room temperature;

The paper insulating material is selected from cable paper, insulating cardboard or PPLP.

Preferably, the cryogenic container is a cylindrical structure, the paper insulation is placed on the inner side of the cylinder of the cryogenic container, and the cylindrical top surface and cylindrical bottom surface of the cryogenic container are insulated from the liquid nitrogen with a sufficient margin. distance.

According to another aspect of the present invention, there is provided a main insulation method for a vertical high temperature superconducting resistance current limiter, characterized in that it includes:

Preforming the paper insulation, winding the paper insulation material to form a multi-layer concentric cylinder structure to obtain the formed paper insulation;

According to the design parameters of the composite insulation structure, the paper insulation is installed inside the cryogenic container, the paper insulation is close to the inner surface of the cylinder of the cryogenic container, and liquid nitrogen is filled inside the paper insulation to obtain a composite insulation structure;

The superconducting resistor current-limiting unit is placed at the center of the composite insulating structure, and the composite insulating structure is used to jointly bear the working voltage and the impulse voltage of the superconducting resistor current-limiting unit.

Preferably, according to the design parameters of the composite insulation structure, the paper insulation is installed inside the cryogenic container, the paper insulation is close to the inner side of the cylinder of the cryogenic container, and the inside of the paper insulation is filled with liquid Nitrogen results in a composite insulating structure consisting of:

The design parameters are determined by the partial pressure insulation strength that the device needs to withstand, and the design parameters specifically include: the thickness d _paper of the paper insulation, the space length d liquid nitrogen of the _{liquid nitrogen} ;

With the composite insulation structure, the liquid nitrogen and the paper insulation jointly withstand the working voltage and the impulse voltage, and the electric field relationship is as follows when working in a steady state:

E _paper d _paper + E _{liquid nitrogen} d _{liquid nitrogen} = V _{main insulation voltage} (1)

From the above formula:

E _{liquid nitrogen} d _{liquid nitrogen} = V _{main insulation voltage} - E _paper d _paper (2)

In the above two formulas, according to the value of V _{main insulation voltage} , it is calculated: the thickness d _paper of the paper insulation and the space length d liquid nitrogen of the _{liquid nitrogen} , and by increasing the thickness d _paper of the paper insulation, reduce The voltage value that the liquid nitrogen must withstand.

Preferably, the use of a composite insulation structure to jointly bear the working voltage and the impulse voltage of the superconducting resistance current limiting unit includes:

The radial main insulating electric field formed in the device is jointly borne by the paper insulation on the cylindrical side of the cryogenic container and the liquid nitrogen;

The main insulating electric field of the cylindrical top surface and the cylindrical bottom surface of the cryogenic container in the device is borne by liquid nitrogen.

It can be seen from the technical solutions provided by the above embodiments of the present invention that the embodiments of the present invention provide a main insulation structure device and method for a vertical high temperature superconducting resistance current limiter, on the premise of meeting the withstand voltage requirements of the main insulation In this way, the external dimension of the superconducting current limiter can be reduced, the equipment occupation requirement of the superconducting current limiter can be reduced, and the effective utilization rate of liquid nitrogen can be improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and will become apparent from the description, or may be learned by practice of the invention.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is the schematic diagram of the main insulation structure device of a kind of vertical high temperature superconducting resistance type current limiter provided by the embodiment of the present invention;

Fig. 2 is a schematic diagram of the composition of the paper insulation structure of the main insulation structure device of a vertical high temperature superconducting resistance type current limiter provided by the embodiment of the present invention;

Fig. 3 is a flow chart of the manufacturing method steps of the main insulation structure of a vertical high temperature superconducting resistance type current limiter provided by the embodiment of the present invention;

Among them, 1-outlet unit, 2-superconducting resistance current limiting unit, 3-cryogenic container, 4-paper insulation, 5-liquid nitrogen, 41-paper insulation material, 42-the gap between adjacent layers of paper insulation.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and/or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Additionally, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in commonly used dictionaries should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as herein explain.

In order to facilitate the understanding of the embodiments of the present invention, several specific embodiments will be taken as examples for further explanation below in conjunction with the accompanying drawings, and each embodiment does not constitute a limitation to the embodiments of the present invention.

Embodiment one

In order to reduce the size of the superconducting current limiter and reduce the equipment footprint requirements of the superconducting current limiter on the premise of meeting the main insulation withstand voltage requirements, a vertical high temperature superconducting resistor is designed in the embodiment of the present invention Main insulation structure device and method of type current limiter. The insulating structure device proposed in the embodiment of the present invention is a composite structure. The insulating structure in the device includes liquid nitrogen and paper insulating material. The paper insulating material is used to form a multi-layer concentric structure and compounded with liquid nitrogen, which can jointly withstand high-temperature superconductivity. The operating voltage and impulse voltage of the resistive current limiter, and by increasing the thickness of the paper insulation to reduce the voltage value that the liquid nitrogen must withstand, thereby reducing the space length of the liquid nitrogen, so that the overall size of the main insulation structure device is reduced, Improve the effective utilization of liquid nitrogen.

The structural diagram of the main insulation structure device of a vertical high temperature superconducting resistance current limiter provided by the embodiment of the present invention is shown in Figure 1. The device includes: an outlet unit 1, a superconducting resistance current limiting unit 2, and a cryogenic container 3. Paper insulation 4 and liquid nitrogen 5, cryogenic container 3 is a cylindrical structure, paper insulation 4 is a cylindrical structure, the outer diameter of paper insulation 4 is the same as the inner diameter of cryogenic container 3; superconducting resistance current limiting unit 2 In the center of the device, the superconducting resistance current limiting unit 2 is connected to two outlet units 1, and the two outlet units 1 are led out of the device, the paper insulation 4 is placed inside the cryogenic container 3, and the liquid nitrogen 5 is placed in the paper insulation 4 Between the current limiting unit 2 and the superconducting resistor.

The device provided by the embodiment of the present invention is a main insulation structure that can be used for a vertical high temperature superconducting resistance current limiter, and the main insulation structure is a composite insulation structure made of liquid nitrogen and paper.

The specific composition structure of the device provided by the embodiment of the present invention is as follows:

(1) Paper insulation

Paper insulation is a multi-layer concentric structure composed of paper insulation materials, and the paper insulation is a cylindrical structure as a whole.

A schematic diagram of the composition of the paper insulation structure of the main insulation structure device of a vertical high temperature superconducting resistance current limiter provided by the embodiment of the present invention is shown in Figure 2. The paper insulation material is tightly wound in a spiral form to a given thickness to form multiple layers Concentric structure, the given thickness is determined by the designed partial voltage insulation strength; there is a certain gap between the adjacent layers of the multi-layer concentric structure, according to the needs of the actual situation, the gap between the adjacent layers of insulating materials can be impregnated and other ways to glue and fill to become a solid body, or not to fill and keep the gap.

Among them, the conditions that paper insulation materials need to meet are: good mechanical properties at low temperature and good forming properties at room temperature; therefore, paper insulation materials can be selected from cable paper, insulating cardboard, PPLP (polypropylene laminated paper) and other materials.

(2) Composite insulation structure

The composite insulation structure includes: paper insulation and liquid nitrogen, and the liquid nitrogen is placed inside the paper insulation.

The composite insulation structure first preforms the paper insulation on the outside according to the design parameters. The design parameters are determined by the partial voltage insulation strength designed by the device. The design parameters specifically include: the thickness of the paper insulation d _paper , the space length of liquid nitrogen d _{liquid nitrogen} .

Preforming the paper insulation means that the paper insulation material is wound outside to form a multi-layer concentric cylindrical structure to obtain the formed paper insulation, and the outer diameter of the paper insulation matches the inner diameter of the cryogenic container, and then the paper insulation is integrated Mounted inside the cryogenic vessel and filled with liquid nitrogen on the inside of the paper insulation.

(3) Main insulation structure device

The main insulation structure device includes: a composite insulation structure and a low-temperature container, the composite insulation structure is placed inside the low-temperature container, and the low-temperature container is cylindrical as a whole.

The composite insulation structure is arranged close to the inner side of the cylinder of the cryogenic vessel (that is, the zero potential side) in the vertical high-temperature superconducting resistance type current limiter system, and the composite insulation structure and the cryogenic vessel are mechanically connected and fixed to prevent the composite insulation structure from The paper insulation in has shifted during operation.

The composite insulation structure is placed on the inner side of the cylinder of the low-temperature container, which is mainly to consider the integration of the current limiter system, the convenience of assembly and the reliability of the insulation. However, the main insulation design of the top and bottom surfaces of the cryogenic vessel is still carried out in the traditional way, that is, a sufficient margin of nitrogen insulation distance is considered.

Those skilled in the art should understand that the aforementioned winding of paper insulation into a cylindrical structure based on the cylindrical cryogenic vessel in the superconducting current limiter system is only a technical solution to better illustrate the embodiment of the present invention. It is not intended to limit the embodiments of the present invention. Any method of determining the shape of the paper insulation according to the shape of the cryogenic vessel in the superconducting current limiter system is included in the scope of the embodiments of the present invention.

According to the above-mentioned device, the steps of the main insulation method for the vertical high-temperature superconducting resistance current limiter are shown in Figure 3, specifically as follows:

Step S310: Preforming the paper insulation, winding it with paper insulation materials to form a multi-layer concentric cylinder structure, and obtaining the formed paper insulation.

To preform the paper insulation, that is, first use the paper insulation material to be tightly wound in a spiral form to a given thickness to form a multi-layer concentric structure, and obtain the formed paper insulation; there is a certain gap between adjacent layers of the multi-layer concentric structure, According to the needs of the actual situation, the gap between adjacent layers of insulating materials can be glued and filled into one entity by dipping, or not filled to keep the gap; and the outer diameter of the paper insulation matches the inner diameter of the cryogenic container.

Step S320: According to the design parameters of the composite insulation structure, install paper insulation of a given thickness inside the cryogenic container, the paper insulation is close to the inner side of the cylinder of the cryogenic container, and the inside of the paper insulation is filled with liquid nitrogen to obtain a composite insulation structure.

In the case of not using the main insulation structure device described in the embodiment of the present invention, liquid nitrogen is used as the main insulation to bear all the working voltage and impulse voltage. Especially in the process of current limiting impact, due to the vaporization of liquid nitrogen, the risk of insulation failure is relatively high. After adopting the main insulation structure device described in the embodiment of the present invention, the liquid nitrogen and the paper insulation can bear the working voltage and the impulse voltage together. In this way, the electric field relationship in steady state operation is:

E _paper d _paper + E _{liquid nitrogen} d _{liquid nitrogen} = V _{main insulation voltage} (1)

So, you can get:

E _{liquid nitrogen} d _{liquid nitrogen} = V _{main insulation voltage} - E _paper d _paper (2)

It can be seen from formula (1) that the design parameters of the composite insulation structure are determined by the partial voltage insulation strength that the device should bear. The design parameters specifically include: the thickness of paper insulation _dpaper , the space length of liquid nitrogen d _{liquid nitrogen} , According to the V _{main insulation voltage} can be calculated: the thickness of paper insulation d _paper and liquid nitrogen space length d _{liquid nitrogen} .

It can be seen from formula (2) that by increasing the thickness of the paper insulation, the voltage value that liquid nitrogen must withstand can be reduced. Especially in the flow-limiting impact process, although the vaporization of liquid nitrogen produces a large number of bubbles, these bubbles are only distributed in the liquid nitrogen space. Due to the shielding effect of the paper insulation, these air bubbles do not degrade the insulation performance of the paper insulation.

Step S330: placing the superconducting resistor current-limiting unit at a central position inside the composite insulation structure, and using the composite insulation structure to jointly bear the working voltage and the impulse voltage of the superconducting resistor current-limiting unit.

Using the main insulation method of the vertical high temperature superconducting resistance type current limiter provided by the embodiment of the present invention to design the insulation structure, the main insulation electric field in the radial direction is jointly borne by the paper insulation and liquid nitrogen close to the cryogenic container wall; and the low temperature The main insulating electric field of the cylinder top and bottom of the container is still only borne by liquid nitrogen.

In addition, considering that the resistivity and relative permittivity of the paper insulating material are greater than that of liquid nitrogen, after adopting the composite insulating structure device described in the embodiment of the present invention, the necessary liquid nitrogen space length d _{liquid nitrogen} of the device can be reduced In other words, in the device proposed in the embodiment of the present invention, the external dimensions of the cryogenic container are reduced, and the effective utilization rate of liquid nitrogen is improved.

By using the main insulation method of the vertical high-temperature superconducting resistance current limiter provided by the embodiment of the present invention, a main insulation structure device with simple overall structure and uncomplicated manufacturing process can be obtained.

Embodiment two

This embodiment provides a main insulation structure device of a vertical high temperature superconducting resistance type current limiter.

Fig. 1 is a schematic diagram of a main insulation structure device of a vertical high temperature superconducting resistance current limiter provided by an embodiment of the present invention. The superconducting current limiter system applying the composite main insulation structure described in the embodiment of the present invention mainly includes: an outlet unit 1 , a superconducting resistor current limiting unit 2 , a cryogenic container 3 , paper insulation 4 and liquid nitrogen 5 . The paper insulation 4 has a cylindrical structure, and the outer diameter of the paper insulation 4 matches the inner diameter of the cryogenic container 3. After the paper insulation 4 is formed by winding the outside, it is installed inside the cryogenic container 3 and connected to the cylinder of the cryogenic container 3. The side walls are mechanically fixed to prevent the paper insulation 4 from shifting during operation.

According to the composite insulation structure design in Figure 1, the main insulation electric field in the radial direction is jointly borne by the paper insulation 3 and the liquid nitrogen 5 close to the side wall of the cryogenic container. However, the main insulating electric field on the top and bottom of the thermostat cylinder is still only supported by liquid nitrogen.

Fig. 2 is a schematic diagram of the structural composition of the paper insulation of the main insulation structure device of a vertical high temperature superconducting resistance current limiter provided by an embodiment of the present invention. Paper insulating material 41 such as cable paper, insulating cardboard, and PPLP is tightly wound in a spiral form to a given thickness, which is determined by the designed partial voltage insulation strength. The gaps 42 between adjacent layers of insulating materials 41 may be filled by gluing by means of dipping or the like, or may not be filled.

In summary, the embodiment of the present invention designs a main insulation structure device and method for a vertical high-temperature superconducting resistance current limiter, which can reduce the superconducting current limit on the premise of meeting the main insulation withstand voltage requirements. The outline scale of the device reduces the equipment occupation requirements of the superconducting current limiter. The insulating structure device designed in the embodiment of the present invention is a composite structure. The insulating structure in the device includes liquid nitrogen and paper insulating material. The paper insulating material is used to form a multi-layer concentric structure and compounded with liquid nitrogen to jointly withstand the high temperature superconducting resistance type. The operating voltage and impulse voltage of the current limiter, and by increasing the thickness of the paper insulation, the voltage value that the liquid nitrogen must withstand is reduced, thereby reducing the space length of the liquid nitrogen, reducing the overall size of the main insulation structure device, and improving the liquid nitrogen. Effective utilization of nitrogen. The embodiment of the present invention has simple structure, uncomplicated manufacturing process, high production efficiency, and can meet the requirement of mass production.

Those skilled in the art can understand that the accompanying drawing is only a schematic diagram of an embodiment, and the modules or processes in the accompanying drawing are not necessarily necessary for implementing the present invention.

It can be seen from the above description of the implementation manners that those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general hardware platform. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products can be stored in storage media, such as ROM/RAM, disk , CD, etc., including several instructions to make a computer device (which may be a personal computer, server, or network device, etc.) execute the methods described in various embodiments or some parts of the embodiments of the present invention.

Each embodiment in this specification is described in a progressive manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device or system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and for relevant parts, refer to part of the description of the method embodiments. The device and system embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, It can be located in one place, or it can be distributed to multiple network elements. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. It can be understood and implemented by those skilled in the art without creative effort.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (9)

1. a kind of Main Insulation Structure of Electric device of vertical high-temperature superconduction resistance-type current restrictor characterized by comprising outgoing line unit, Superconduction resistance current limiting unit, low-temperature (low temperature) vessel, paper insulation and liquid nitrogen, the superconduction resistance current limiting unit are placed in the center inside device Position simultaneously connects two outgoing line units, and the outgoing line unit is drawn outward from the top of the low-temperature (low temperature) vessel, multilayer concentric The paper insulation of structure is placed in the inside of the low-temperature (low temperature) vessel, and the liquid nitrogen is placed in the paper insulation and the superconduction resistance limits It flows between unit, the composite insulation structure of the liquid nitrogen and paper insulation composition is common to bear high-temperature superconductor resistor-type current limliting The operating voltage and surge voltage of device.

2. the Main Insulation Structure of Electric device of vertical high-temperature superconduction resistance-type current restrictor according to claim 1, which is characterized in that The paper insulation and the low-temperature (low temperature) vessel carry out mechanical connection fixation, for preventing the paper insulation to be displaced in operation.

3. the Main Insulation Structure of Electric device of vertical high-temperature superconduction resistance-type current restrictor according to claim 2, which is characterized in that The paper insulation is made of isolit, and paper insulation is generally columnar structured.

4. the Main Insulation Structure of Electric device of vertical high-temperature superconduction resistance-type current restrictor according to claim 1, which is characterized in that Gap between isolit described in adjacent layer, carrying out glued filling as desired by impregnation method becomes an entity, Or without filling retention gap.

5. the Main Insulation Structure of Electric device of vertical high-temperature superconduction resistance-type current restrictor according to claim 1, which is characterized in that The paper insulated outer diameter is identical as the internal diameter of the low-temperature (low temperature) vessel.

6. the Main Insulation Structure of Electric device of vertical high-temperature superconduction resistance-type current restrictor according to claim 1, which is characterized in that The low-temperature (low temperature) vessel is cylindrical structure, and the paper insulation is placed in the cylinder medial surface of the low-temperature (low temperature) vessel, the low-temperature (low temperature) vessel Cylinder top surface and bottom cylindrical face and the liquid nitrogen at a distance of sufficient surplus nitrogen gas insulating distance.

7. a kind of design method of the major insulation of vertical high-temperature superconduction resistance-type current restrictor, based on any one of claim 1-6 institute The device stated characterized by comprising

It is preforming to paper insulation progress, multi-concentric cylindrical structure is formed with the isolit coiling, is obtained into The paper insulation of type；

According to the design parameter of composite insulation structure, the paper insulation is mounted on to the inside of the low-temperature (low temperature) vessel, the paper is exhausted Edge is close to the cylinder medial surface of the low-temperature (low temperature) vessel, and in paper insulated inside, filling liquid nitrogen obtains composite insulation structure；

The superconduction resistance current limiting unit is placed in the center inside the composite insulation structure, utilizes composite insulation structure The operating voltage and surge voltage of the superconduction resistance current limiting unit are born jointly.

8. the design method of the major insulation of vertical high-temperature superconduction resistance-type current restrictor according to claim 7, feature exist In the paper insulation is mounted on the inside of the low-temperature (low temperature) vessel by the design parameter according to composite insulation structure, described Paper insulation is close to the cylinder medial surface of the low-temperature (low temperature) vessel, and in paper insulated inside, filling liquid nitrogen obtains composite insulation structure, wraps It includes:

The design parameter is that the partial pressure dielectric strength being subjected to by device determines that design parameter specifically includes: the paper The thickness d of insulation_Paper, the space length d of the liquid nitrogen_{Liquid nitrogen}；

Using the composite insulation structure, the liquid nitrogen and the paper insulation bear operating voltage and surge voltage jointly, steady When state works, electric field relationship are as follows:

E_Paperd_Paper+E_{Liquid nitrogen}d_{Liquid nitrogen}=V_{Major insulation voltage} (1)

It is obtained from above formula:

E_{Liquid nitrogen}d_{Liquid nitrogen}=V_{Major insulation voltage}-E_Paperd_Paper (2)

In above-mentioned two formula, according to V_{Major insulation voltage}Value be calculated: the paper insulated thickness d_PaperIt is long with the space of the liquid nitrogen Spend d_{Liquid nitrogen}, and by increasing the paper insulated thickness d_Paper, reduce the voltage value that the liquid nitrogen must endure as.

9. the design method of the major insulation of vertical high-temperature superconduction resistance-type current restrictor according to claim 7, feature exist In the operating voltage and surge voltage for bearing the superconduction resistance current limiting unit jointly using composite insulation structure, comprising:

The radial major insulation electric field formed in the device, the paper insulation and the liquid by the low-temperature (low temperature) vessel cylindrical side Nitrogen is born jointly；

The major insulation electric field of the cylinder top surface of the low-temperature (low temperature) vessel and bottom cylindrical face in the device, is born by liquid nitrogen.