阅读说明：本技术 一种高压电容器的心子及高压电容器 (Core of high-voltage capacitor and high-voltage capacitor ) 是由 国江 马跃 黄想 林浩 陈江波 严飞 朱庆东 黄有祥 姜胜宝 吴永利 倪学锋 于 2020-07-30 设计创作，主要内容包括：本发明公开了一种高压电容器的心子和高压电容器,所述心子包括：多个串联的元件单元和与每个元件单元并联的放电电阻；每个元件单元包括：多个并联的电容元件和与每个电容元件串联的内熔丝；每个内熔丝和其两端的连接线弯设于两个电容元件之间的区域；所述装置包括：箱体、绝缘紧箍夹板和心子；所述心子和所述绝缘紧箍夹板位于所述箱体内部,箱体内部填充有绝缘油,所述心子浸设于所述绝缘油中；所述绝缘紧箍夹板,夹设于所述心子的两端,以避免高压电容器内部有悬浮电位。本发明的高压电容器具有大容量且体积比特性小的优点,同时减小了设备的重量,降低了安装难度,对于有我国输变电工程用并联电容器具有重要的理论和应用价值。(The invention discloses a core of a high-voltage capacitor and the high-voltage capacitor, the core comprises: a plurality of series-connected element units and a discharge resistor connected in parallel to each element unit; each element unit includes: a plurality of capacitive elements in parallel and an internal fuse in series with each capacitive element; each internal fuse and the connecting wires at two ends of the internal fuse are bent and arranged in the area between the two capacitance elements; the device comprises: the box body, the insulating tightening clamp plate and the core; the core and the insulating tightening clamp plate are positioned in the box body, insulating oil is filled in the box body, and the core is immersed in the insulating oil; insulating tight clamp plate presss from both sides and locates the both ends of heart to avoid high-voltage capacitor inside to have the suspension electric potential. The high-voltage capacitor has the advantages of high capacity and small volume ratio, reduces the weight of equipment, reduces the installation difficulty, and has important theoretical and application values for the parallel capacitor for power transmission and transformation projects in China.)

1. A core for a high voltage capacitor, said core comprising: a plurality of series-connected element units and a discharge resistor connected in parallel to each element unit; each element unit includes: a plurality of capacitive elements in parallel and an internal fuse in series with each capacitive element; each internal fuse and the connecting lines at both ends thereof are bent at a region between the two capacitive elements.

2. The heart according to claim 1, characterized in that said capacitive element comprises: two plates and an interpolar dielectric located between the two plates.

3. The core of claim 2, wherein the pole plate is aluminum foil; the polar plate adopts a folded edge protruding structure.

4. The core as claimed in claim 2, wherein the interpolar dielectric is a multilayer high temperature resistant polypropylene film.

5. A high voltage capacitor, comprising: -a box, insulating clinch clips and a core as claimed in any one of claims 1 to 4; wherein the content of the first and second substances,

the core and the insulating tightening clamp plate are positioned in the box body, insulating oil is filled in the box body, and the core is immersed in the insulating oil;

insulating tight clamp plate presss from both sides and locates the both ends of heart to avoid high-voltage capacitor inside to have the suspension electric potential.

6. A high-voltage capacitor according to claim 5, characterized in that the compression factor of the insulating clamping straps is a preset threshold value.

7. The high voltage capacitor of claim 5, wherein the predetermined threshold is 1.

8. A high-voltage capacitor according to claim 5, characterized in that a plurality of outlet bushings are pierced through the end cap of the tank.

9. The high voltage capacitor of claim 8 wherein said outlet sleeve is a one-piece crimp sleeve.

10. A high-voltage capacitor according to claim 5, wherein 2 lifting holes are provided on both sides of the case.

Technical Field

The present invention relates to the field of power equipment technology, and more particularly, to a core of a high voltage capacitor and a high voltage capacitor.

Background

At present, the volume ratio characteristic of the advanced capacitor produced abroad reaches 0.07L/kvar, and the field strength reaches (58-71) V/mum. Compared with the technical level of foreign advanced capacitors, the field intensity of the capacitors produced in China can reach (51-57) V/mum, the volume ratio characteristic is 0.105L/kvar, and the volume ratio characteristic index of the capacitors is about 50 percent higher than that of foreign capacitors. Taking a capacitor with the capacity of 556kvar and vertically and horizontally installed as an example, the occupied area of domestic products is 49 percent larger than that of foreign products, and the weight of the products is 41 percent higher. There is a great gap between domestic power capacitors and foreign advanced capacitors. From the economic and environmental protection perspective, the capacitor with the high capacity-to-ratio characteristic can greatly reduce the floor area of the capacitor device; from the operability perspective, the weight reduction of the capacitor can greatly reduce the workload during installation, improve the installation convenience and improve the shock resistance.

Therefore, a high-voltage capacitor with high capacitance and high-ratio characteristics needs to be researched.

Disclosure of Invention

The invention provides a core of a high-voltage capacitor and the high-voltage capacitor, which are used for solving the problem of how to improve the capacity and the characteristics of the high-voltage capacitor.

In order to solve the above-mentioned problems, according to an aspect of the present invention, there is provided a core for a high voltage capacitor, the core comprising: a plurality of series-connected element units and a discharge resistor connected in parallel to each element unit; each element unit includes: a plurality of capacitive elements in parallel and an internal fuse in series with each capacitive element; each internal fuse and the connecting lines at both ends thereof are bent at a region between the two capacitive elements.

Preferably, wherein the capacitive element comprises: two plates and an interpolar dielectric located between the two plates.

Preferably, wherein the plate is an aluminum foil; the polar plate adopts a folded edge protruding structure.

Preferably, wherein the interpolar dielectric is a multilayer high temperature resistant polypropylene film.

According to another aspect of the present invention, there is provided a high voltage capacitor, the apparatus comprising: -a box, insulating clinch clips and a core as claimed in any one of claims 1 to 4; wherein the content of the first and second substances,

the core and the insulating tightening clamp plate are positioned in the box body, insulating oil is filled in the box body, and the core is immersed in the insulating oil;

insulating tight clamp plate presss from both sides and locates the both ends of heart to avoid high-voltage capacitor inside to have the suspension electric potential.

Preferably, the compression factor of the insulating fastening splint is a preset threshold value.

Preferably, wherein the preset threshold is 1.

Preferably, a plurality of wire outlet sleeves penetrate through the end cover of the box body.

Preferably, the outgoing line sleeve is an integrated crimping sleeve.

Preferably, two sides of the box body are provided with 2 hoisting holes.

The high-voltage capacitor has important theoretical and application values for parallel capacitor units for power transmission and transformation projects in China, can be widely applied to parallel capacitor compensation devices for 35kV-1000kV transformer substations, can generate good economic benefits, and meets the requirements of national energy conservation and emission reduction and resource conservation-building society.

Drawings

A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:

FIG. 1 is a schematic structural diagram of a core of a high voltage capacitor according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a high voltage capacitor according to an embodiment of the present invention;

fig. 3 is an exemplary diagram of a high voltage capacitor according to an embodiment of the present invention.

Detailed Description

The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the invention and to fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.

Unless otherwise defined, 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. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.

The embodiment of the invention provides a core of a high-voltage capacitor and the high-voltage capacitor, wherein the high-voltage capacitor has the advantages of high capacity and small volume ratio, the weight of equipment is reduced, and the installation difficulty is reduced.

Fig. 1 is a schematic structural view of a core of a high voltage capacitor according to an embodiment of the present invention. As shown in fig. 1, the embodiment of the present invention provides a core 100 of a high voltage capacitor, the core including: a plurality of series-connected element units 101 and a discharge resistor 102 connected in parallel to each element unit; each element unit 101 includes: a plurality of capacitive elements 1011 connected in parallel and an internal fuse 1012 connected in series with each capacitive element 1011; each internal fuse 1012 and the connecting lines at both ends thereof are bent at a region between the two capacitive elements 1011.

In an embodiment of the present invention, the core includes 4 element units connected in series and a discharge resistor connected in parallel to each element unit; each element unit includes 16 capacitive elements connected in parallel and an internal fuse connected in series with each capacitive element. The internal fuse is hidden, and each internal fuse and the connecting line at two ends of the internal fuse are bent and arranged between two adjacent capacitance elements nearest to the internal fuse. The capacity of each high-voltage capacitor can reach 668kvar, and the field intensity is not lower than 63 kV/mm.

Preferably, wherein the capacitive element comprises: two plates and an interpolar dielectric located between the two plates.

Preferably, wherein the plate is an aluminum foil; the polar plate adopts a folded edge protruding structure.

Preferably, wherein the interpolar dielectric is a multilayer high temperature resistant polypropylene film.

In the implementation method of the invention, the interelectrode medium of the capacitor element is a 3-layer high-temperature-resistant polypropylene film, and the stable temperature of the film performance is 20 ℃ higher than that of the conventional film; the polar plate adopts the aluminium foil, and thickness is 0.005mm, and the aluminium foil adopts hem bulge structure, consequently can not appear the electric field distortion electricity, can effectively reduce the partial discharge of component.

Fig. 2 is a schematic structural diagram of a high-voltage capacitor according to an embodiment of the invention. As shown in fig. 2, the high-voltage capacitor 200 according to the embodiment of the present invention includes: a box body 201, an insulating clamping plate 202 and a core 203. The structure of the core 203 is the same as that of the core 100, and will not be described herein.

Preferably, the core 203 and the insulating clamping plate 202 are located inside the box 201, the box 201 is filled with insulating oil, and the core 203 is immersed in the insulating oil.

Preferably, the insulating clamping plate 202 is clamped at two ends of the core 203 to avoid a floating potential inside the high-voltage capacitor.

Preferably, the compression factor of the insulating fastening splint is a preset threshold value.

Preferably, wherein the preset threshold is 1.

Preferably, a plurality of wire outlet sleeves penetrate through the end cover of the box body.

Preferably, the outgoing line sleeve is an integrated crimping sleeve.

Preferably, two sides of the box body are provided with 2 hoisting holes.

In the embodiment of the invention, the impregnant with excellent high temperature resistance and ageing resistance is used as the insulating oil, and the breakdown voltage of the insulating oil is reduced by not more than 10% through a 1000-hour heat ageing test at 180 ℃. The core is clamped by an insulating tightening clamp plate, the suspension potential in the capacitor is avoided, and the compression coefficient of the insulating tightening clamp plate is 1. The box body is formed by bending and welding stainless steel plates. The size of the box body is 383mm multiplied by 179mm multiplied by 857mm, the volume is 58.7L, the capacity of the capacitor unit is 668kvar, and the volume ratio characteristic can be ensured to be not more than 0.09L/kvar. Two little sides of box have welded 2 hoisted holes, supply transport and installation to use. There are 2 wire sleeve pipes on the end cover of box, and wire sleeve pipe is the integral type crimping sleeve pipe of 10 skirts, and the creep distance is 620mm, and the clear distance is 225mm, can satisfy 50/125kV insulation level's requirement to integral type crimping sleeve pipe can effectively prevent the oil leakage.

In the embodiment of the invention, the high-voltage capacitor with large capacity and high specific gravity should be designed to have the field strength not lower than 63kV/mm, the capacity not lower than 668kvar, the volume specific gravity not higher than 0.09L/kvar and the loss not higher than 0.018%. The altitude of the capacitor installation and operation area should not exceed 1000m, and the ambient air temperature is (-40-50) DEG C. Specifically, the high-voltage power capacitor with high capacity-to-ratio characteristics should meet the following performance requirements:

(1) deviation of capacitance

The deviation between the measured capacitance of the capacitor (corrected to 20 ℃) and its nominal value should not exceed-1% - + 3%.

(2) Loss tangent (tan delta)

The loss tangent (tan delta) of the capacitor at 20 ℃ should not be more than 0.00018 at rated voltage and rated frequency.

(3) Relationship between loss tangent (tan. delta.), capacitance, and temperature

And measuring the loss tangent, the capacitance and the temperature of the capacitor in a temperature range of-40-80 ℃ to make a correlation curve, wherein in the temperature range, the absolute value of the temperature coefficient of capacitance of the capacitor is not more than 0.0004/K, and the loss tangent is not more than 0.0003. The measurement temperature points were-40 deg.C, -20 deg.C, 0 deg.C, 20 deg.C, 40 deg.C, 60 deg.C, and 80 deg.C. The test was performed after the oven temperature was raised to each temperature point for at least 8h or the medium temperature was raised to each temperature point for 2 h.

(4) Level of insulation

The insulation level of the capacitor was 50/125 kV.

(5) Inter-terminal voltage test

The dielectric between the two terminals of the capacitor should be able to withstand a mains ac test voltage of 2.15UN for 10 s.

(6) Discharge resistor

The internal discharging resistance of the capacitor can make the residual voltage self-maintain within 10minAnd the voltage is reduced to below 50V.

(7) Partial discharge performance

1) Delivery test

In the inter-terminal voltage test process of the factory test, the partial discharge of the capacitor is monitored. After the terminal test voltage lasts for 10s, the voltage is firstly reduced to 1.2UN and kept for 1min, then the voltage is increased to 1.5 UN and kept for lmin, and the partial discharge level is not increased in the last 1 min.

In the pole-to-shell voltage test process of a factory test, the pole-to-shell partial discharge of the capacitor is monitored. At a specified value of 40pC, the extinction voltage of the capacitor electrode-to-case partial discharge should be not less than 1.2 times the maximum operating line voltage ULm (ULm-17.3 kV).

2) Type test

Pressurizing (no more than 2.15UN) at normal temperature for 1s after the initiation of inter-electrode partial discharge, reducing the pressure to 1.35UN for 10min, and then increasing the pressure to 1.6UN for 10min, wherein the partial discharge amount between the capacitor electrodes should be no more than 40 pC.

The partial discharge extinction voltage between electrodes of the capacitor should be not less than 1.2UN at a low temperature (-40 ℃).

The extinguishing voltage of the partial discharge of the capacitor electrode to the shell should not be lower than 1.2 times the highest operating line voltage ULm (applied voltage is not more than 35kV) at normal temperature.

The specified value of the inter-electrode and electrode-to-case partial discharge amount of the capacitor is 40 pC.

(8) Heat stability test

The capacitor cooling air temperature was 55 ℃ during the thermal stability test.

(9) Mechanical strength of bushing and lead-out terminal

The capacitor's bushing should be able to withstand a horizontal pull of 500N and the outgoing terminals should be able to withstand a torque of 40N · m.

(10) Withstand blasting energy

The capacitor shell can bear the explosion energy of not less than 15 kJ.

Fig. 3 is an exemplary diagram of a high voltage capacitor according to an embodiment of the present invention. As shown in fig. 3, the high voltage capacitor includes: core, box, insulating tight hoop splint, play line sleeve pipe and hole for hoist. The core comprises 4 element units connected in series and a discharge resistor connected with each element unit in parallel; each element unit includes 16 capacitive elements in parallel and an internal fuse in series with each capacitive element. The internal fuse is of a hidden structure, and each internal fuse and the connecting wires at two ends of the internal fuse are bent between two adjacent capacitor elements closest to the internal fuse, so that the specified discharge requirement can be met. The core is clamped by an insulating tightening clamping plate, so that the suspended potential in the capacitor is avoided. Each capacitor element is of a full-film structure, the interpolar medium is a 3-layer high-temperature-resistant polypropylene film (2 multiplied by RR0.0100mm + RR0.0103mm), the stable temperature of the film performance is 20 ℃ higher than that of the conventional film, the field intensity is 64.59MV/m, and the compression coefficient k is 1; the polar plate adopts aluminium foil 1235 model, 0.005mm, and the aluminium foil adopts hem bulge structure, can not appear electric field distortion electricity, effectively reduces the component partial discharge. The box body is formed by bending and welding stainless steel plates. The size of the box body is 383mm multiplied by 179mm multiplied by 857mm, the volume is 58.7L, the capacity of the capacitor unit is 668kvar, and the volume ratio characteristic can be ensured to be not more than 0.09L/kvar. Two little sides of box have welded 2 hoist and mount holes, supply transport and installation to use. The wire outgoing sleeve pipe adopts 10 skirt integral type crimping sleeve pipes, and the creep distance is 620mm, and the clear distance is 225mm, can satisfy 50/125kV insulation level's requirement, and integral type crimping sleeve pipe can effectively prevent the oil leakage. In an embodiment of the invention, to ensure that the total temperature rise is not greater than 25.6 ℃, the total loss should not exceed 0.156W/kvar, to ensure that the total weight is not greater than 88kg, and the weight ratio characteristic is not greater than 0.132kg/kvar, the parameters affecting loss, temperature and weight are set as in table 1. The field intensity of the high-voltage capacitor is not lower than 63kV/mm, the capacity is not lower than 668kvar, the volume ratio characteristic is not higher than 0.09L/kvar, and the loss is not higher than 0.018%.

TABLE 1 high-Capacity-to-ratio-characteristic capacitor cell Primary design calculation parameters

The invention has been described with reference to a few embodiments. However, as is known to the person skilled in the art, other embodiments than the ones disclosed above are equally possible within the scope of the invention, as defined by the appended patent claims.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inside", "outside", and the like are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which should be construed to be within the scope of the claims.