CN115223795A

CN115223795A - Composite dielectric high-voltage capacitor and corresponding distribution network series compensation device

Info

Publication number: CN115223795A
Application number: CN202211138978.5A
Authority: CN
Inventors: 范彦峰; 范泽宇
Original assignee: Shaanxi Sifang Huaneng Electric Equipment Co ltd
Current assignee: Shaanxi Sifang Huaneng Electric Equipment Co ltd
Priority date: 2022-09-19
Filing date: 2022-09-19
Publication date: 2022-10-21
Anticipated expiration: 2042-09-19
Also published as: CN115223795B

Abstract

The application discloses composite dielectric high voltage capacitor and net series compensation arrangement that joins in marriage that corresponds, the condenser includes: the inner rod is of a hollow structure, the interior of the inner rod is provided with a storage cavity, and insulating oil is stored in the storage cavity; the capacitor core is arranged on the outer side surface of the inner rod and formed by laminating electrodes and composite media, two ends of the capacitor core are respectively inserted into the storage cavity, and insulating oil is soaked in the capacitor core; the connecting columns are respectively arranged at two ends of the inner rod, the two connecting columns are made of metal materials, and the two connecting columns are respectively and electrically connected with the two electrodes in the capacitor core. This application is through storing insulating oil in interior pole to insert interior pole with the end of condenser core, make the condenser core can soak in insulating oil, ensured the job stabilization nature of condenser, not only greatly reduced the quantity of insulating oil, need not to adopt metal casing moreover, further reduced the weight and the volume of condenser, be favorable to the miniaturization and the lightweight design of condenser.

Description

Composite dielectric high-voltage capacitor and corresponding distribution network series compensation device

Technical Field

The application relates to the technical field of power electronics, in particular to a composite dielectric high-voltage capacitor and a corresponding distribution network series compensation device.

Background

Distribution network series compensation is a technology adopted in high-voltage or low-voltage power transmission at present. After the distribution network series compensation device is configured on the power transmission line, the power quality at the tail end of the power grid can be effectively improved, and the normal operation of various electrical equipment is ensured.

The distribution network series compensation device comprises a large number of electric elements such as capacitors, isolating switches and the like. Because the distribution network series compensation device is an independent device and needs to occupy extra space during installation, how to reduce the volume and the weight of the distribution network series compensation device is always a concern of an inner scholars. Among the electrical components, the capacitor is the core device of the whole distribution network series compensation device. In order to improve the operation stability of the capacitor, an oil-filled capacitor is generally used. The dielectric and the electrode soaked in the oil can be in a stable environment for a long time, so that the service life and the working stability of the capacitor can be improved.

However, in the currently used oil-filled capacitor, a metal housing is mostly used to seal oil therein, so that the weight and volume of the capacitor are further increased, which is very disadvantageous to the miniaturization and weight reduction of the capacitor.

Disclosure of Invention

The embodiment of the application provides a composite medium high-voltage capacitor and a corresponding distribution network series compensation device, and aims to solve the problem that the volume and the weight of an oil-immersed capacitor are large in the prior art.

In one aspect, an embodiment of the present application provides a composite dielectric high-voltage capacitor, including:

the inner rod is of a hollow structure and made of an insulating material, a storage cavity is formed in the inner rod, and insulating oil is stored in the storage cavity;

the capacitor core is arranged on the outer side surface of the inner rod and formed by laminating electrodes and composite media, two ends of the capacitor core are respectively inserted into the storage cavity, and insulating oil is soaked in the capacitor core;

and the two connecting columns are respectively arranged at two ends of the inner rod, are made of metal materials and are respectively and electrically connected with the two electrodes in the capacitor core.

On the other hand, the embodiment of the application further provides a distribution network series compensation device with a composite medium high-voltage capacitor, which comprises:

a box body;

and the compensation circuit is arranged in the box body and comprises the composite medium high-voltage capacitor.

In the application, the composite medium high-voltage capacitor and the corresponding distribution network series compensation device have the following advantages:

the insulating oil is stored in the inner rod, and the tail end of the capacitor core is inserted into the inner rod, so that the capacitor core can be soaked in the insulating oil, the working stability of the capacitor is ensured, the using amount of the insulating oil is greatly reduced, a metal shell is not required, the weight and the volume of the capacitor are further reduced, and the miniaturization and lightweight design of the capacitor are facilitated.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic external structural diagram of a composite dielectric high-voltage capacitor provided in an embodiment of the present application;

fig. 2 is a schematic axial sectional view of a composite dielectric high-voltage capacitor according to an embodiment of the present disclosure;

fig. 3 is a schematic radial sectional view of a composite dielectric high-voltage capacitor according to an embodiment of the present invention;

FIG. 4 is an enlarged view of a portion of the area A in FIG. 3 according to an embodiment of the present disclosure;

fig. 5 is a partially enlarged schematic view of a region a in fig. 3 according to another embodiment of the present application.

The reference numbers illustrate: 100-main body, 110-inner rod, 111-storage cavity, 120-capacitor core, 121-bending part, 130-coating layer, 131-outer partition body, 140-guide plate, 150-baffle and 200-connecting column.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Fig. 1 to 5 are schematic structural diagrams of a composite dielectric high-voltage capacitor provided in an embodiment of the present application. The embodiment of the application provides a composite dielectric high-voltage capacitor, includes:

the inner rod 110 is of a hollow structure, the inner rod 110 is made of an insulating material, a storage cavity 111 is formed in the inner rod, and insulating oil is stored in the storage cavity 111;

the capacitor core 120 is arranged on the outer side surface of the inner rod 110, the capacitor core 120 is formed by stacking electrodes and composite media, two ends of the capacitor core 120 are respectively inserted into the storage cavity 111, and insulating oil is soaked in the capacitor core 120;

the connecting posts 200 are respectively disposed at both ends of the inner rod 110, the two connecting posts 200 are made of a metal material, and the two connecting posts 200 are respectively electrically connected with two electrodes in the condenser core 120.

For example, the inner rod 110 may be made of plastic, rubber, etc., and both ends thereof may be provided with grooves matching the size of the connecting column 200, and the connecting column 200 may be inserted into the grooves. The capacitor core 120 includes at least two layers of electrodes and a composite medium disposed between the two layers of electrodes, and the composite medium is made of an insulating material, for example, various films, paper, and the like. In order to increase the amount of the insulating oil entering the capacitor core 120, a thin film layer with strong oil absorption capacity can be added inside the capacitor core 120, and after the thin film layer together with other composite media and electrodes are inserted into the inner rod 110, the insulating oil can be absorbed through siphon action and the other composite media and the electrodes can be infiltrated.

In one possible embodiment, the number of capacitor cores 120 is plural, and plural capacitor cores 120 are connected in parallel in sequence.

For example, since the absorption capacity of the capacitor core 120 for the insulating oil is limited, when the length of the capacitor core 120 is large, the amount of the insulating oil in the area near the center may be much smaller than the amount of the insulating oil in the areas near the both ends, resulting in the failure of the insulating oil to be effectively impregnated in the capacitor core 120. To address this problem, the present application shortens the length of a single capacitor core 120 and increases the number of capacitor cores 120, thereby increasing the uniformity of the insulating oil in each capacitor core 120 as much as possible without substantially changing the overall capacity.

When the number of the capacitor cores 120 is multiple, the corresponding electrodes can be connected by using a conducting wire, for example, the multiple positive electrodes are connected together, and the multiple negative electrodes are also connected together, and the electrically connected electrodes are electrically connected with the corresponding connecting posts 200 through the lead-out pieces, so that the parallel connection of the multiple capacitor cores 120 is realized, and the overall capacity of the capacitor is increased.

In one possible embodiment, the capacitor core 120 is stacked on the outer side of the inner rod 110, the capacitor core 120 is externally provided with a cladding layer 130, and the cladding layer 130 is made of an insulating material.

The condenser core 120 is a thin and flexible structure, and can be folded in half, and then the two ends of the condenser core are inserted into the inner rod 110, and the portions of the condenser core located outside the inner rod 110 are folded in sequence to form a multi-layer structure and then surround the inner rod 110. In order to reduce or even avoid evaporation of the insulating oil in the capacitor core 120, the capacitor core 120 may be sealed with an insulating film and then folded together with the insulating film so that the insulating oil can flow only inside the insulating film.

After the capacitor core 120 is completely folded, the cover layer 130 can be wrapped on the side of the capacitor core 120 opposite to the inner rod 110, so that the position of the capacitor core 120 is fixed, and the capacitor is integrated.

In one possible embodiment, the inner side of the cladding 130 is provided with an outer spacer 131 between two adjacent capacitor cores 120.

Illustratively, the outer spacers 131 are raised structures made of the same material or different materials as the cladding layer 130, and after the outer spacers 131 are inserted between two connected capacitor cores 120, the capacitor cores 120 can be confined between two adjacent outer spacers 131.

In a possible embodiment, the outer side of the inner rod 110 is provided with an inner partition between two adjacent condenser cores 120.

For example, the inner partition has the same function as the outer partition 131, and the capacitor of the present application may be provided with both the inner partition and the outer partition 131, or with one of them. And the corresponding outer partition 131 and the inner partition can be connected by the partition, so that the limiting effect on the capacitor core 120 is further improved.

In a possible embodiment, a plug hole is provided on the side of the inner rod 110, into which plug hole the end of the capacitor core 120 is plugged.

Illustratively, the insertion holes may be uniformly arranged on the side of the inner rod 110, and the width of the insertion holes corresponds to the thickness of a single layer of the capacitor core 120, and the length of the insertion holes corresponds to the width of a single layer of the capacitor core 120, so that the ends of the capacitor core 120 may be inserted into the insertion holes and remain stable.

Further, since the side wall of the inner rod 110 is thin, it is difficult to secure the stability of the condenser core 120 by the insertion hole alone, and therefore, the guide plate 140 is provided outside the insertion hole on the side surface of the inner rod 110 of the present application, and the direction of the guide plate 140 is the same as the center line direction of the insertion hole. The number of the guide plates 140 is at least two, and the side surfaces of at least two guide plates 140 close to the insertion hole are flush with the edge of the insertion hole, i.e. the distance between two opposite guide plates 140 is the same as the size of the insertion hole in the corresponding direction.

The guide plate 140 may be disposed on the inner or outer side of the inner rod 110.

In a possible embodiment, the end of the guiding plate 140 is provided with a baffle 150, the end of the capacitor core 120 is bent to form a bent portion 121, and the bent portion 121 abuts against the baffle 150 after the end of the capacitor core 120 is inserted into the insertion hole.

Illustratively, after the guide plate 140 is adopted, although the stability of the capacitor core 120 inserted into the insertion hole can be improved to some extent, the capacitor core can still be pulled out when a strong external force is applied. The present application thus also provides a baffle 150 at the end of one of the guide plates 140 parallel to the outer side of the inner rod 110 and extending towards the opposite other guide plate 140. After the tail end of the capacitor core 120 is bent and forms the bent part 121, the bent part 121 is integrally inserted into the insertion hole, then the bent part 121 is naturally opened under the elastic action and inserted below the baffle 150, when the capacitor core 120 is pulled by external force, the baffle 150 can prevent the capacitor core 120 from being separated from the insertion hole, and the insertion stability of the capacitor core 120 is improved.

The embodiment of the application also provides a join in marriage net series compensation arrangement with compound medium high voltage capacitor, includes:

a box body;

and the compensation circuit is arranged in the box body and comprises the composite dielectric high-voltage capacitor.

Illustratively, the composite dielectric high-voltage capacitor may be provided in the compensation circuit in a plurality of parallel connections.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A composite dielectric high voltage capacitor, comprising:

the inner rod (110) is of a hollow structure, the inner rod (110) is made of an insulating material, a storage cavity (111) is formed in the inner rod, and insulating oil is stored in the storage cavity (111);

the capacitor core (120) is arranged on the outer side surface of the inner rod (110), the capacitor core (120) is formed by laminating electrodes and composite media, two ends of the capacitor core (120) are respectively inserted into the storage cavity (111), and the insulating oil is soaked in the capacitor core (120);

the connecting columns (200) are respectively arranged at two ends of the inner rod (110), the two connecting columns (200) are made of metal materials, and the two connecting columns (200) are respectively and electrically connected with two electrodes in the capacitor core (120).

2. The composite dielectric high-voltage capacitor as claimed in claim 1, wherein the number of the capacitor cores (120) is plural, and the plural capacitor cores (120) are connected in parallel in sequence.

3. The composite dielectric high-voltage capacitor as claimed in claim 2, wherein the capacitor core (120) is stacked on the outer side surface of the inner rod (110), a cladding layer (130) is arranged outside the capacitor core (120), and the cladding layer (130) is made of an insulating material.

4. A composite dielectric high voltage capacitor according to claim 3, characterized in that an outer spacer (131) is arranged on the inner side of the cladding (130) between two adjacent capacitor cores (120).

5. A composite dielectric high voltage capacitor as claimed in claim 2, characterized in that an inner partition is arranged on the outer side of the inner rod (110) between two adjacent capacitor cores (120).

6. A composite dielectric high voltage capacitor according to claim 2, characterized in that the respective electrodes of a plurality of said capacitor cores (120) are connected by means of wires, and the electrically connected electrodes are electrically connected to the corresponding connection posts (200) by means of tabs.

7. The composite dielectric high-voltage capacitor as claimed in claim 1, wherein a plug hole is provided on the side surface of the inner rod (110), and the end of the capacitor core (120) is plugged into the plug hole.

8. The composite dielectric high-voltage capacitor as claimed in claim 7, wherein a guide plate (140) is arranged on the side of the inner rod (110) outside the insertion hole, and the direction of the guide plate (140) is the same as the direction of the center line of the insertion hole.

9. The composite dielectric high-voltage capacitor as claimed in claim 8, wherein a baffle (150) is disposed at the end of the guide plate (140), the end of the capacitor core (120) is bent to form a bent portion (121), and after the end of the capacitor core (120) is inserted into the insertion hole, the bent portion (121) abuts against the baffle (150).

10. A distribution network series compensation device with a composite medium high-voltage capacitor is characterized by comprising:

a box body;

a compensation circuit disposed within the housing, the compensation circuit comprising the composite dielectric high voltage capacitor of any one of claims 1-9.