CN217158947U

CN217158947U - High-voltage switch cabinet with lightning arrester

Info

Publication number: CN217158947U
Application number: CN202221058592.9U
Authority: CN
Inventors: 焦小斌; 余新火
Original assignee: Zhejiang Fujie Electric Co ltd
Current assignee: Zhejiang Fujie Electric Co ltd
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-08-09
Anticipated expiration: 2032-04-28

Abstract

The utility model discloses a high tension switchgear with arrester, including the cubical switchboard and install the arrester in the cubical switchboard, the arrester includes overcoat and the zinc oxide resistance card of setting in the overcoat, and the both ends of overcoat are provided with top connection and lower clutch respectively, and fixed a plurality of zinc oxide resistance card that is provided with between top connection and the lower clutch together that is provided with, zinc oxide resistance card center is equipped with through-hole, a plurality of the through-hole constitutes the lift track, and sliding connection has conductive nut in the lift track, conductive nut and lower clutch electric connection, and threaded connection has insulating adjusting screw on the conductive nut, and insulating adjusting screw's one end and top connection rotate to be connected. Can change the distance between conductive nut and the top connection through rotating insulating adjusting screw, insert the zinc oxide resistance card of different quantity to the rated voltage of adjustment zinc oxide arrester, thereby the effectual use cost and the maintenance cost who saves the arrester in the electric wire netting.

Description

High-voltage switch cabinet with lightning arrester

Technical Field

The utility model relates to a high tension switchgear especially relates to a high tension switchgear with arrester.

Background

The lightning arrester is a device which is very commonly used in a power grid framework, wherein the zinc oxide lightning arrester has good protection performance, and the current flowing through the lightning arrester is extremely small (microampere or milliampere) at normal working voltage by utilizing the good nonlinear volt-ampere characteristic of the zinc oxide; when overvoltage acts, the resistance drops sharply, and the energy of the overvoltage is released, so that the protection effect is achieved. Different parameters and models of arresters are required for factors such as different voltage levels, different positions and different actions. At present, the lightning arrester with one type in the market only has one fixed parameter and has no capability of changing the parameter, and the type of the lightning arrester used is likely to change along with the change of the application environment, so that the use cost of the lightning arrester is high.

Chinese patent No. CN202020695887.1 discloses a parameter-adjustable lightning arrester, which is formed by connecting a plurality of zinc oxide valve plate columns in parallel, wherein each zinc oxide valve plate column is wrapped in a solid insulating medium; each zinc oxide valve plate column is formed by connecting a plurality of zinc oxide valve plate units in series; a change-over switch is connected in parallel between the valve plates of each zinc oxide valve plate unit, and two ends of each zinc oxide valve plate column are respectively provided with a column change-over switch which is respectively connected in series with the change-over switches of the valve plates of the zinc oxide valve plate units at the two ends; the parameters of the lightning arrester can be adjusted by adjusting the working states of the change-over switches. The circuit structure is complex, a plurality of change-over switches are arranged, the manufacture is inconvenient, and the cost is higher.

SUMMERY OF THE UTILITY MODEL

The utility model discloses solve the problem that above-mentioned prior art exists, provide a high tension switchgear with arrester, simple structure, it is convenient and the cost is lower to make.

The utility model provides a technical scheme that its technical problem adopted: the utility model provides a high tension switchgear with arrester, includes the cubical switchboard and installs the arrester in the cubical switchboard, and the arrester includes overcoat and the zinc oxide resistance card of setting in the overcoat, and the both ends of overcoat are provided with top connection and lower clutch respectively, fixed zinc oxide resistance card that is provided with a plurality of range upon range of between top connection and the lower clutch, zinc oxide resistance card center is equipped with through-hole, a plurality of the through-hole constitutes the lift track, and sliding connection has conductive nut in the lift track, conductive nut and lower clutch electric connection, and threaded connection has insulating adjusting screw on the conductive nut, insulating adjusting screw's one end with the top connection rotates to be connected.

Further perfection, rotate on the top connection and install the regulation head, the inner of adjusting the head and the one end fixed connection of insulating adjusting screw.

Further perfection, the upside of conductive nut is equipped with insulating gasket.

Further perfection, electrically conductive spring is fixedly connected between electrically conductive nut and the lower clutch.

Further perfection, the shapes of the lifting track and the conductive nut are hexagonal or elliptical.

The conductive nut is characterized in that a groove is formed in the side wall of the conductive nut, an elastic contact is arranged on the groove, and a fixed contact matched with the elastic contact is arranged on the inner wall of the through hole.

Further perfection, the insulation adjusting screw is a multilayer winding type complex body of impregnated resin materials, and insulation bearings are arranged at the upper end and the lower end of the insulation adjusting screw.

The utility model discloses profitable effect is: the zinc oxide arrester in the switch cabinet is connected with an external circuit through an upper joint and a lower joint, when the leakage voltage of the zinc oxide resistor disc cannot meet the requirement, the conductive nut can move up and down under the action of threads by rotating the insulating adjusting screw rod, the distance between the conductive nut and the upper joint is changed, and the zinc oxide resistor discs with different quantities are connected, so that the rated voltage of the zinc oxide arrester is adjusted, the safe and grounding operation under higher operation overvoltage and atmospheric overvoltage is ensured, the circuit structure is simple, the manufacturing is convenient and low in cost, workers can correspondingly adjust the parameters of the used arrester according to the change of an application environment, the use cost and the maintenance cost of the arrester in a power grid are effectively saved, and the service life of the switch cabinet is prolonged.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural view of the arrester;

description of reference numerals: 1. the device comprises an outer sleeve, 2, a zinc oxide resistance card, 3, an upper joint, 4, a lower joint, 5, a lifting track, 6, a conductive nut, 7, an insulating adjusting screw rod, 8, an adjusting head, 9, an insulating gasket, 10, a conductive spring, 11, an elastic contact, 12, a fixed contact, 13, an insulating bearing, 14, a switch cabinet, 15 and a lightning arrester.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

referring to figures 1-2: the embodiment of the utility model provides a high tension switchgear with arrester, includes the cubical switchboard and installs the arrester in the cubical switchboard, and the arrester includes overcoat 1 and sets up zinc oxide resistance card 2 in overcoat 1, and overcoat 1's both ends are provided with top connection 3 and lower clutch 4 respectively, fixed zinc oxide resistance card 2 that is provided with a plurality of range upon range of between top connection 3 and the

lower clutch

4, 2 centers of zinc oxide resistance card are equipped with the through-hole, a plurality of the through-hole constitutes lift track 5, and sliding connection has conductive nut 6 in the lift track 5,

conductive nut

6 and 4 electric connection of lower clutch, and threaded connection has insulating adjusting screw 7 on the conductive nut 6, insulating adjusting screw 7's one end with top connection 3 rotates and connects. The working principle is as follows: the zinc oxide arrester is an electrical product used for protecting various electrical equipment in an electric power system from being damaged by overvoltage, has good protection performance, and has the capability of absorbing various lightning overvoltage, power frequency transient overvoltage and operation overvoltage. The rated voltage of the zinc oxide arrester should be such that it is higher than the power frequency transient voltage that it may present at the installation site. The main difficulty of the lightning arrester model selection problem is the problem of determining the range of temporary overvoltage, and the rated voltage of a common zinc oxide lightning arrester is fixed and cannot be adjusted according to actual conditions, so that the requirement of a power system cannot be well met. The zinc oxide arrester is connected with an external circuit through the upper connector 3 and the lower connector 4, the nonlinear volt-ampere characteristic of the zinc oxide resistance chip 2 is very good, so that only hundreds of microamperes of current pass through the zinc oxide arrester under normal working voltage, when overvoltage invades, the current flowing through the zinc oxide resistance chip 2 is rapidly increased, the amplitude of the overvoltage is limited, the current is conducted through the upper connector 3, the zinc oxide resistance chip 2, the conductive nut 6 and the lower connector 4, the energy of the overvoltage is released, and then the zinc oxide resistance chip 2 returns to a high-resistance state, so that the power system normally works. When the zinc oxide resistor disc 2 is installed and used actually, when the leakage voltage of the zinc oxide resistor disc 2 is too small, the insulating adjusting screw 7 can be driven to rotate forwards, the conductive nut 6 is moved downwards under the action of the threads, the distance between the conductive nut 6 and the upper connector 3 is increased, and a large number of zinc oxide resistor discs 2 are connected, so that the rated voltage of the zinc oxide arrester is increased, and the zinc oxide resistor disc 2 is guaranteed not to act under the temporary overvoltage. When the leakage voltage of the zinc oxide resistance sheet 2 is overlarge, the insulating adjusting screw 7 can be driven to rotate reversely, the conductive nut 6 is moved upwards under the action of the threads, the distance between the conductive nut 6 and the upper joint 3 is shortened, and a small number of zinc oxide resistance sheets 2 are connected, so that the rated voltage of the zinc oxide lightning arrester is reduced, and the safe and earthable operation under high operation overvoltage and atmospheric overvoltage is ensured.

An adjusting head 8 is rotatably arranged on the upper joint 3, and the inner end of the adjusting head 8 is fixedly connected with one end of an insulating adjusting screw 7. The adjusting head 8 can be matched with an external screwdriver or a wrench tool so as to drive the insulating adjusting screw 7 to rotate, and the adjusting head 8 has a sealing effect and can isolate external moisture from contacting with the insulating adjusting screw 7.

And the insulating gasket 9 is arranged on the upper side of the conductive nut 6, so that breakdown between the conductive nut and the upper joint and between the conductive nut and the zinc oxide resistance card 2 can be avoided.

The conductive spring 10 is fixedly connected between the conductive nut 6 and the lower connector 4, has the functions of conducting electricity and improving operation hand feeling, and can enable the conductive nut 6 and the insulating adjusting screw 7 to be more compactly connected.

The lifting track and the conductive nut 6 are hexagonal or elliptical in shape, and the lifting track has a circumferential limiting effect on the conductive nut 6.

The side wall of the conductive nut 6 is provided with a groove, the groove is provided with an elastic contact 11, the inner wall of the through hole is provided with a fixed contact 12 matched with the elastic contact 11, the thickness of the zinc oxide resistance card 2 can be effectively controlled, and the parameter adjustment precision of the lightning arrester is improved.

The insulating adjusting screw 7 is a multilayer winding type composite body of an impregnated resin material, is made of a plastic material and has good high-voltage insulating performance, and the upper end and the lower end of the insulating adjusting screw 7 are provided with insulating bearings 13, so that the electric shock phenomenon can be avoided when the insulating adjusting screw 7 is rotated.

While the invention has been shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the appended claims.

Claims

1. The utility model provides a high tension switchgear with arrester, includes the cubical switchboard and installs the arrester in the cubical switchboard, and the arrester includes overcoat (1) and zinc oxide resistance card (2) of setting in overcoat (1), and the both ends of overcoat (1) are provided with top connection (3) and lower clutch (4) respectively, its characterized in that: the zinc oxide resistance card (2) that a plurality of range upon range of is fixed to be provided with between top connection (3) and lower clutch (4), and zinc oxide resistance card (2) center is equipped with the through-hole, a plurality of the through-hole constitutes lift track (5), and sliding connection has conductive nut (6) in lift track (5), conductive nut (6) and lower clutch (4) electric connection, and threaded connection has insulating adjusting screw (7) on conductive nut (6), the one end of insulating adjusting screw (7) with top connection (3) rotate and are connected.

2. The high-voltage switch cabinet with the lightning arrester as claimed in claim 1, characterized in that: an adjusting head (8) is rotatably mounted on the upper joint (3), and the inner end of the adjusting head (8) is fixedly connected with one end of the insulating adjusting screw rod (7).

3. The high-voltage switch cabinet with the lightning arrester as claimed in claim 1, characterized in that: and an insulating gasket (9) is arranged on the upper side of the conductive nut (6).

4. The high-voltage switch cabinet with the lightning arrester as claimed in claim 1, characterized in that: and a conductive spring (10) is fixedly connected between the conductive nut (6) and the lower joint (4).

5. The high-voltage switch cabinet with the lightning arrester as claimed in claim 1, characterized in that: the lifting track and the conductive nut (6) are hexagonal or elliptical in shape.

6. The high-voltage switch cabinet with the lightning arrester as claimed in claim 1, characterized in that: the side wall of the conductive nut (6) is provided with a groove, the groove is provided with an elastic contact (11), and the inner wall of the through hole is provided with a fixed contact (12) matched with the elastic contact (11).

7. The high-voltage switch cabinet with the lightning arrester as claimed in claim 1, characterized in that: the insulation adjusting screw rod (7) is a multilayer winding type composite body impregnated with resin materials, and insulation bearings (13) are arranged at the upper end and the lower end of the insulation adjusting screw rod (7).