WO2019210457A1

WO2019210457A1 - Soft conductor high-voltage capacitor

Info

Publication number: WO2019210457A1
Application number: PCT/CN2018/085295
Authority: WO
Inventors: 王春华; 顾明锋; 宋玉锋; 顾曹新; 姚卫东; 丁菊; 顾勇
Original assignee: 江苏现代电力科技股份有限公司
Priority date: 2018-05-02
Filing date: 2018-05-02
Publication date: 2019-11-07

Abstract

Provided is a soft conductor high-voltage capacitor, containing an outer housing (1), a capacitive element (3), a medium (2), a high-voltage flexible conductor (4), and a sealing element (5); the outer housing (1) is a sealed housing; the medium (2) is filled in a sealed accommodating cavity in the outer housing (1); the capacitive element (3) is arranged in the inner accommodating cavity of the outer housing (1) and is immersed in the medium (2); the high-voltage flexible conductor (4) is fixed to the upper side of the outer housing (1) by means of the sealing element (5), and the two high-voltage flexible conductors (5) are connected to the two terminals of the capacitor element (3), respectively. A flexible conductor is used as the terminal for the capacitor, thus reducing the volume of the entire capacitor; furthermore, the flexible conductor is convenient to connect low in cost, and is more flexible for installation and lighter in weight.

Description

Soft wire high voltage capacitor

Technical field

The present invention relates to a high voltage capacitor, and more particularly to a flexible wire high voltage capacitor.

Background technique

A high voltage capacitor (formerly known as a phase shifting capacitor) is one of the reactive power sources of the power system and is used to increase the power factor of the power grid. The high voltage capacitor is mainly composed of an outlet ceramic sleeve, a capacitor component group and a casing. The outer casing is sealed and welded with a thin steel plate, and the outer porcelain sleeve is welded to the outer casing. The terminal is led out of the outlet bushing. The capacitive component group (also called the core) in the outer casing is connected by a plurality of capacitive components. The capacitor element is made of capacitor paper, film paper composite or pure film as a medium, and is made of aluminum-platinum as a plate. In order to meet the voltage withstand voltage requirements of various voltage levels, the capacitive elements can be connected in series or in parallel. The capacitive element group of a single three-phase capacitor is connected in a triangular shape inside the casing. In a high-voltage capacitor with a voltage of 10 kV or less, a fuse is connected to each of the capacitor elements as an internal short-circuit protection of the capacitor. Some capacitors are equipped with discharge resistors. When the capacitor is disconnected from the grid, it can be discharged through the discharge resistor. Under normal conditions, the residual voltage of the capacitor can be reduced to less than 75V after 10 minutes.

In the power industry, capacitors are a common electrical component. The current 3kV-20kV capacitors are high-voltage ceramic bottles because of their high voltage levels. This method is bulky, heavy, and costly. There are space requirements and restrictions.

Summary of the invention

The technical problem to be solved by the present invention is to provide a flexible wire high voltage capacitor which is small in size and low in cost.

In order to solve the above technical problems, the technical solution adopted by the present invention is:

A flexible wire high voltage capacitor, comprising: a casing, a capacitor element, a medium, a high voltage flexible wire and a sealing component, the casing is a sealed casing, the medium is filled in a sealed cavity in the casing, and the capacitor component is disposed in the casing cavity The inside is immersed in the medium, and the high-voltage flexible wire is fixed to the upper side of the casing through the sealing member and the two high-voltage flexible wires are respectively connected to the two terminals of the capacitor element.

Further, the high voltage flexible wire comprises a conductor and an insulating layer, the insulating layer is coated on the outside of the conductor and the thickness of the insulating layer is at least twice the diameter of the conductor.

Further, the sealing element comprises a sealing seat and a sealing cover, the sealing seat is fixed on the upper side of the outer casing, the sealing seat is provided with a through hole for the high-voltage soft wire to pass through, and the upper end of the sealing seat through hole is provided with a plurality of notches, the notch The upper end of the sealing seat is opened downward along the axial direction of the sealing seat and a plurality of notches are equally spaced along the circumference of the sealing seat at the upper end of the sealing seat. The outer side of the sealing seat is provided with an external thread, and the inner side of the sealing cover is arranged to match the external thread of the sealing seat. The internal thread has a through hole for the high-voltage flexible wire to pass through the upper end of the sealing cover, and the sealing cover is disposed on the sealing seat to be screwed with the sealing seat.

Further, the sealing element comprises a connecting portion, an O-ring and a plurality of screws, the connecting portion is a disc shape protruding from the high-voltage flexible wire, and the connecting portion is integrally formed with the high-voltage flexible wire, the lower side of the connecting portion and the upper side of the outer casing A screw hole is opened in the upper part, and a plurality of screws are inserted into the screw hole from the inner side of the outer casing to fix the connecting portion, and the O-ring is disposed inside the connecting portion.

Further, the medium is a capacitor oil, and the capacitor oil comprises one or more of benzyl toluene, diarylethane, and phenylethylphenylethane.

Further, the insulating layer of the high-voltage flexible wire is made of silicone rubber, fluororubber or Teflon.

Further, the outer casing is made of a stainless steel plate seal welded.

Compared with the prior art, the invention has the following advantages and effects: the invention adopts a soft wire as the lead end of the capacitor, thereby reducing the volume of the entire capacitor, and the flexible wire is convenient to connect, the cost is low, and the installation is more convenient. Flexible and lightweight.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic illustration of a flexible wire high voltage capacitor of the present invention.

2 is a schematic view of a high voltage flexible wire of the present invention.

Figure 3 is a schematic view of Embodiment 1 of the sealing member of the present invention.

Figure 4 is a schematic view of a second embodiment of the sealing member of the present invention.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings.

Example 1:

As shown, a flexible wire high voltage capacitor of the present invention comprises a casing 1, a capacitor element 3, a medium 2, a high voltage flexible wire 4 and a sealing member 5, the casing 1 being a sealed casing, and the medium 2 being filled in the casing 1 In the sealed cavity, the capacitive element 3 is disposed in the inner cavity of the outer casing 1 and immersed in the medium 2. The high-voltage flexible wire 4 is fixed on the upper side of the outer casing 1 through the sealing element 5 and the two high-voltage flexible wires 4 and the two capacitive elements 3, respectively. Connected to the pole.

The high-voltage flexible wire 4 comprises a conductor 6 and an insulating layer 7, and the insulating layer 7 is coated on the outside of the conductor 6 and the thickness of the insulating layer 7 is at least twice the diameter of the conductor 6.

The sealing member 5 comprises a sealing seat 8 and a sealing cover 9 fixed on the upper side of the outer casing 1. The sealing seat 8 is provided with a through hole through which the high-voltage flexible wire 4 passes and the sealing seat 8 is provided with a plurality of notches at the upper end of the through hole. 10, the notch 10 is opened downward from the upper end of the sealing seat 8 along the axial direction of the sealing seat 8 and a plurality of notches 10 are distributed at equal intervals along the circumferential direction of the sealing seat 8 at the upper end of the sealing seat 8, and the outer side of the sealing seat 8 is provided with an external thread. The inner side of the sealing cover 9 is provided with an internal thread matching the external thread of the sealing seat 8. The upper end of the sealing cover 9 is provided with a through hole for the high-voltage flexible wire 4 to pass through and the sealing cover 9 is covered on the sealing seat 8 to be screwed with the sealing seat 8. .

The medium 2 is a capacitor oil, and the capacitor oil contains one or more of benzyl toluene, diarylethane, and phenylethylphenylethane. The insulating layer 7 of the high-voltage flexible wire 4 is made of silicone rubber, fluororubber or Teflon. The outer casing 1 is made of a stainless steel plate seal welded.

Example 2:

A flexible wire high voltage capacitor comprises a casing 1, a capacitor element 3, a medium 2, a high voltage flexible wire 4 and a sealing member 5, the casing 1 is a sealed casing, and the medium 2 is filled in a sealed cavity in the casing 1, the capacitor element 3 Provided in the inner cavity of the outer casing 1 and submerged in the medium 2, the high-voltage flexible wire 4 is fixed to the upper side of the outer casing 1 by the sealing member 5 and the two high-voltage flexible wires 4 are respectively connected to the two terminals of the capacitive element 3.

The sealing member 5 includes a connecting portion 11, an O-ring 12 and a plurality of screws 13, the connecting portion 11 is in the shape of a disc protruding from the high-voltage flexible wire 4, and the connecting portion 11 is integrally formed with the high-voltage flexible wire 4, and the connecting portion 11 is under A screw hole is formed in the upper side of the side and the outer casing 1, and a plurality of screws 13 are inserted into the screw holes from the inner side of the outer casing 1 to lock the fixed connecting portion 11, and the O-ring 12 is disposed inside the connecting portion 11.

The above description in this specification is merely illustrative of the invention. A person skilled in the art can make various modifications or additions to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the scope of the present specification or beyond the scope defined by the claims. It belongs to the scope of protection of the present invention.

Claims

A flexible wire high voltage capacitor, comprising: a casing, a capacitor element, a medium, a high voltage flexible wire and a sealing component, the casing is a sealed casing, the medium is filled in a sealed cavity in the casing, and the capacitor component is disposed in the casing cavity The inside is immersed in the medium, and the high-voltage flexible wire is fixed to the upper side of the casing through the sealing member and the two high-voltage flexible wires are respectively connected to the two terminals of the capacitor element.
A soft wire high voltage capacitor according to claim 1, wherein said high voltage flexible wire comprises a conductor and an insulating layer, and the insulating layer is coated on the outside of the conductor and the thickness of the insulating layer is at least twice the diameter of the conductor.
A flexible wire high voltage capacitor according to claim 1, wherein said sealing member comprises a sealing seat and a sealing cover, wherein the sealing seat is fixed on the upper side of the outer casing, and the sealing seat is provided with a passage for the high-voltage flexible wire to pass through. The hole and the upper end of the sealing seat through hole are provided with a plurality of notches, the notch is opened downward from the upper end of the sealing seat along the axis of the sealing seat, and a plurality of notches are distributed at the upper end of the sealing seat at equal intervals along the circumference of the sealing seat, and the outer side of the sealing seat is disposed There is an external thread, and the inner side of the sealing cover is provided with an internal thread matched with the external thread of the sealing seat. The upper end of the sealing cover is provided with a through hole for the high-voltage soft wire to pass through and the sealing cover is disposed on the sealing seat to be screwed with the sealing seat.
A flexible wire high voltage capacitor according to claim 1, wherein said sealing member comprises a connecting portion, an O-ring and a plurality of screws, and the connecting portion is a disk shaped to protrude from the high-voltage flexible wire and the connecting portion The utility model is integrally formed with the high-voltage flexible wire, and a screw hole is formed on the lower side of the connecting portion and the upper side surface of the outer casing, and a plurality of screws are inserted into the screw hole through the inner side of the outer casing to fix the connecting portion, and the O-ring is disposed inside the connecting portion.
A soft wire high voltage capacitor according to claim 1, wherein said medium is a capacitor oil, and said capacitor oil comprises one of benzyl toluene, diarylethane, phenylethylphenylethane or Several.
A soft wire high voltage capacitor according to claim 2, wherein the insulating layer of the high voltage flexible wire is made of silicone rubber, fluororubber or Teflon.
A soft wire high voltage capacitor according to claim 1, wherein said outer casing is formed by sealing welding of a stainless steel plate.