CN112448189B

CN112448189B - Connector structure for ring main unit

Info

Publication number: CN112448189B
Application number: CN202011342622.4A
Authority: CN
Inventors: 张佳飞; 杨龙武; 邵伟清
Original assignee: Shanghai Pinggao Tianling Switch Co ltd; State Grid Corp of China SGCC; Pinggao Group Co Ltd
Current assignee: Shanghai Pinggao Tianling Switch Co ltd; State Grid Corp of China SGCC; Pinggao Group Co Ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2022-07-05
Anticipated expiration: 2040-11-25
Also published as: CN112448189A

Abstract

The invention discloses a connector structure for a ring main unit, which at least comprises an electrifying and current guiding unit, wherein the current guiding unit comprises: the tooth piece is provided with a plurality of outer tooth sockets at intervals; the inner side of each conducting plate is clamped into the outer tooth grooves corresponding to the tooth plates, so that the conducting plates are circumferentially distributed on the tooth plates. The invention meets the use of products with rated voltage of 36kV and rated current of 1250A, expands the products to the green and environment-friendly power transmission and distribution fields of wind energy, solar energy and the like, and can be also suitable for the power distribution field with 24kV voltage class in the traditional secondary power distribution system.

Description

Connector structure for ring main unit

Technical Field

The invention relates to the technical field of ring main units, in particular to a connector structure for a ring main unit.

Background

With high reliability, maintenance-free and environmental-friendly totally-enclosed gas-filled cabinets, the market share of distribution network systems is increased year by year, and new requirements on the capacity of a power grid are provided for the user market.

The level of the existing domestic connector is only 12kV at rated voltage, the rated current is 630A, the connector is generally applicable, and the connector can not meet the applicable requirements on dust detection in the aspect of high-voltage level and high-current application. Especially, in the large-scale new forms of energy power generation field at present, in the wind power generation field, the looped netowrk cabinet is often preferred because size advantage, but can only install in wind-powered electricity generation tower edge through the form of case altogether, can't utilize wind-powered electricity generation tower inner space. Generally, the threshold in the air inlet tower only accommodates the entrance and exit of one ring main unit, and the importance of the connector is obvious at the moment. The voltage of a ring main unit used in the wind power field is usually 24kV and 36kV, and at present, domestic manufacturers need to develop a suitable connector urgently to meet the development requirement of the field.

Disclosure of Invention

The invention provides a connector structure for a ring main unit, aiming at solving the technical problem that the existing connector cannot meet the requirement of a 36kV ring main unit.

The technical problem to be solved by the invention can be realized by the following technical scheme:

a connector structure for a ring main unit at least comprises an electrifying and current guiding unit, wherein the current guiding unit comprises:

the tooth piece is provided with a plurality of outer tooth grooves at intervals;

the inner side of each conducting plate is clamped into the outer tooth grooves corresponding to the tooth plates, so that the conducting plates are circumferentially distributed on the tooth plates.

In a preferred embodiment of the invention, each conductive sheet has a flow area of at least 36mm²。

In a preferred embodiment of the invention, the number of the outer tooth grooves on the tooth sheets is 18 or 12, and the number of the conducting strips is 18 or 12.

In a preferred embodiment of the present invention, the teeth are two pieces, and are spaced apart along the length direction of the conductive sheet.

In a preferred embodiment of the present invention, the inner ends of each conductive sheet are outwardly flared.

In a preferred embodiment of the present invention, the present invention further comprises at least one semiconductor gear ring, wherein a plurality of internal tooth grooves are arranged on the inner periphery of the semiconductor gear ring, and the outer side of each conducting strip is clamped into the corresponding internal tooth groove of the semiconductor gear ring; and a plurality of external teeth extending outwards in the radial direction are arranged on the outer periphery of the semiconductor gear ring.

In a preferred embodiment of the invention, the electric conduction plate further comprises at least one spring ring which hoops a plurality of electric conduction plates.

In a preferred embodiment of the invention, the number of the semi-conductor gear rings is two, the number of the spring rings is four, the two semi-conductor gear rings are arranged at intervals in the middle of the conducting plate, and every two spring rings are in a group and are approximately hooped at two ends of the conducting plate.

In a preferred embodiment of the invention, the ring main unit further comprises a sleeve made of a silicon rubber material, the through-current conducting unit is arranged in an inner hole of the sleeve, and the outer periphery of the sleeve is matched with the inner taper sleeves of two adjacent ring main units.

In a preferred embodiment of the invention, a semiconducting layer is provided on the inner bore wall of the sleeve, said semiconducting layer being in electrical contact with the outer teeth on the semiconducting ring gear.

Due to the adoption of the technical scheme, the invention meets the use requirements of products with rated voltage of 36kV and rated current of 1250A, expands the products into the green and environment-friendly power transmission and distribution fields of wind energy, solar energy and the like, and can also be suitable for the power distribution field with 24kV voltage class in the traditional secondary power distribution system.

Drawings

Fig. 1 is a schematic view of the assembly between the conductive sheet and the tooth sheet of the present invention.

FIG. 2 is a schematic view showing the assembly of the conductive sheet, the tooth sheet, the semiconductor ring gear and the spring ring according to the present invention.

Fig. 3 is a schematic view of the assembly between the current conducting unit and the sleeve according to the invention.

Detailed Description

The invention is further described below in conjunction with the appended drawings and the detailed description.

Referring to fig. 1, the connector structure for ring main unit shown in the figure includes an electric conduction unit 10, which includes two teeth 11 and a plurality of conductive pieces 12.

A plurality of outer tooth grooves 11a are distributed at intervals on the outer circumference of each tooth plate 11, and the number of the outer tooth grooves 11a is matched with that of the conducting plates 12. The diversion area of each conducting sheet 12 is about 36mm²Thus, if 18 conductive plates 12 are used, the number of external tooth grooves 11a is also 18. With 18 conductive sheets 12, the total flow area is about 648mm²And current capacity of 1250A is satisfied. If 12 conductive plates 12 are used, the number of external tooth grooves 11a is also 12. With 12 conductive sheets 12, the total flow area is about 432mm²And the 630A current capacity is satisfied.

In order to better clamp the conductive plates 12 into the external tooth grooves 11a of the tooth plates 11, a clamping groove 12a is also provided at a position of each conductive plate 12 corresponding to the tooth plate 11, and the clamping groove 12a and the external tooth grooves 11a are mutually embedded, so that the circumferential position and the axial position of the conductive plates 12 are limited.

During assembly, the two sheets of teeth 11 are spaced apart along the length of the conductive sheet 12 to better support the conductive sheet 12.

In order to form a better electric field at the two ends of each conductive sheet 12, the two inner ends of each conductive sheet 12 are expanded outwards in a circular arc shape.

In order to better define the radial positions of all the conductive sheets 12 and provide a constant restraining force, the electrified guide unit 10 of the present invention further includes four spring rings 15, wherein each two spring rings 15 form a group, and the two ends of a plurality of conductive sheets 12 are hooped. In order to better match the spring ring 15 with the conductive sheets 12, a spring slot 12b is respectively arranged at the two outer ends of each conductive sheet 12, and the spring ring 15 is clamped in the spring slots 12b of all the conductive sheets 12.

Referring to fig. 3, the current conducting unit 10 is disposed in an inner hole 21 of a sleeve 20 supported by silicon rubber, and in order to realize equipotential and optimize an electric field inside the sleeve 20 supported by silicon rubber, the current conducting unit 10 of the present invention further includes semiconductor ring gears 14 (of course, one semiconductor ring gear 14 or more than two semiconductor ring gears 14 may also be employed), a plurality of inner tooth sockets 14a are disposed on an inner circumferential edge of each semiconductor ring gear 14, and an outer side of each conducting strip 12 is inserted into the corresponding inner tooth sockets 14a of the semiconductor ring gears 14; further, a plurality of external teeth 14b extending radially outward are provided on the outer peripheral edge of the semiconductor ring gear 14.

In order to better clamp the semiconductor ring gear 14 on the conducting strips 12, a semiconductor ring gear clamping slot 12c is arranged at the approximate middle position of each conducting strip 12, and the inner tooth socket 14a of the semiconductor ring gear 14 is clamped in the semiconductor ring gear clamping slot 12c on the corresponding conducting strip 12.

In order to prevent the surface of the silicon rubber from being scratched when the current-carrying conduction unit 10 of the present invention is assembled in the inner hole 21 of the sleeve 20, thereby preventing the equipotential from being destroyed and causing partial discharge, a semiconductor layer 22 is provided on the inner hole wall of the sleeve 20, and the semiconductor layer 22 is in electrical contact with the outer teeth 14b of the semiconductor ring gear 14. The thickness of the semiconductor layer 22 is 2 to 3 mm.

The periphery of the sleeve 20 is matched with the inner taper sleeves of two adjacent ring main units, so that the periphery of the sleeve 20 is provided with 5% -10% of compression, and the insulating property meets the 36kV voltage level. When two adjacent ring main units are combined, the two adjacent ring main units are communicated through the connector.

The invention is simple and clear, is convenient to install, and is widely applied to new energy power transmission and distribution and secondary power distribution systems at present. A large amount of practical data show that the structure runs stably and is reasonable in design.

Claims

1. A connector structure for a ring main unit at least comprises a through-current conducting unit, and is characterized in that the through-current conducting unit comprises:

the tooth piece is provided with a plurality of outer tooth sockets at intervals;

the inner side of each conducting plate is clamped into the outer tooth grooves corresponding to the tooth plates, so that the conducting plates are circumferentially distributed on the tooth plates;

the semiconductor gear ring is characterized by further comprising at least one semiconductor gear ring and a sleeve made of silicon rubber material, a plurality of inner tooth grooves are formed in the inner periphery of the semiconductor gear ring, and the outer side of each conducting strip is clamped into the corresponding inner tooth groove of the semiconductor gear ring; a plurality of external teeth extending outwards in the radial direction are arranged on the outer periphery of the semiconductor gear ring; the through-flow conducting unit is arranged in an inner hole of the sleeve, and the periphery of the sleeve is matched with the inner taper sleeves of two adjacent ring main units;

a semiconductor layer is arranged on the inner hole wall of the sleeve and is in electric contact with the outer teeth on the semiconductor gear ring; the periphery of the sleeve is provided with 5% -10% of compression amount.

2. The connector structure for ring main unit as claimed in claim 1, wherein the conducting area of each conducting strip is at least 36mm²。

3. The connector structure for the ring main unit as claimed in claim 2, wherein the number of the external tooth grooves on the tooth plate is 18 or 12, and the number of the conductive plates is 18 or 12.

4. The connector structure for ring main units as claimed in claim 1, wherein the number of the teeth is two, and the teeth are spaced along the length direction of the conductive sheet.

5. The structure of claim 1, wherein the inner ends of each conductive plate are outwardly expanded in an arc shape.

6. The connector structure for ring main units as claimed in claim 1, further comprising at least one spring ring, wherein the spring ring hoops the plurality of conductive strips.

7. The connector structure for ring main units as claimed in claim 6, wherein the number of the semi-conductor gear rings is two, the number of the spring rings is two, the two semi-conductor gear rings are spaced apart from each other at the middle position of the conductive plate, and each spring ring is substantially held by the two ends of the conductive plate.