CN203673900U - 10 kV distribution circuit lightning protection apparatus - Google Patents

Abstract

The embodiment of the utility model provides a 10kV wiring circuit lightning protection device, the device includes: an insulator; The hardware chassis is provided with metal electrodes; the epoxy cylinder arranged inside the insulator, the epoxy cylinder includes a gap cylinder, and the first tapered copper sheet set on the top of the gap cylinder is set on the The second tapered copper sheet at the bottom end of the gap cylinder, and the zinc oxide resistance sheet arranged below the second tapered copper sheet. Since the epoxy cylinder is arranged inside the insulator, the clearance of the gap cylinder in the epoxy cylinder will not be changed by external factors after the on-line operation.

Description

A Lightning Protection Device for 10kV Wiring Circuit

technical field

The utility model relates to the field of databases, in particular to a 10kV wiring circuit lightning protection device. the

Background technique

Among the total trip times of 10kV distribution lines, lightning strikes account for about 40% to 70%. In areas with complex terrain, high soil resistance, and frequent lightning strikes, the failure rate caused by lightning strikes is higher. With the popularization and use of insulated wires, the number of lightning disconnection faults is also increasing, which makes lightning protection technology a research direction that must be paid attention to in distribution network lines. the

The lightning protection device in the prior art includes an overvoltage protector. The overvoltage protector is composed of a metal ring, a zinc oxide arrester and a grounding plate. Zinc arresters guide the lightning current into the earth. In the prior art, the air gap is used to break down the lightning current. If the space gap is large enough, it is enough to eliminate the arcing of the power frequency continuous current, and the size of the air gap is easily changed by external factors after the online operation. the

Utility model content

In view of this, the utility model provides a 10kV wiring circuit lightning protection device to overcome the problem in the prior art that the size of the air gap is easily changed by external factors after it is put into operation. the

In order to achieve the above object, the utility model provides the following technical solutions:

A 10kV wiring circuit lightning protection device, including:

insulator;

a fitting top cap arranged on the top of the insulator, and the fitting top cap is provided with electrodes;

a metal fitting chassis arranged at the bottom of the insulator, and the metal fitting chassis is provided with metal electrodes;

an epoxy cylinder disposed inside the insulator, the epoxy cylinder includes a gap cylinder, a first tapered copper sheet disposed at the top end of the gap cylinder, a second tapered copper sheet disposed at the bottom end of the gap cylinder, A zinc oxide resistance sheet arranged under the second tapered copper sheet. the

Wherein, the lightning protection device is a lightning protection device with a height of 280 mm. the

Wherein, the insulator is an insulator with an insulation distance of 190 mm. the

Wherein, the gap cylinder is a gap cylinder with a height of 80 mm. the

Wherein, the epoxy cylinder is an epoxy cylinder of glass fiber. the

Wherein, the gap cylinder is a ceramic gap cylinder. the

Wherein, the zinc oxide resistor sheet includes three zinc oxide resistors. the

Among them, also include:

Set the screws on the hardware chassis. the

Among them, also include:

A load insulating jacket arranged on the outer surface of the insulator. the

It can be known from the above technical solutions that, compared with the prior art, the embodiment of the present invention provides a 10kV wiring circuit lightning protection device. Since the epoxy cylinder is arranged inside the insulator, the gap between the gap cylinder in the epoxy cylinder It will not be changed by external factors after going online. the

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description It is only an embodiment of the utility model, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work. the

Fig. 1 is a structural schematic diagram of a 10kV wiring circuit lightning protection device provided by the embodiment of the present invention;

Fig. 2 is a structural schematic diagram of an epoxy cylinder disposed inside an insulator in a lightning protection device for a 10kV wiring circuit provided by an embodiment of the present invention. the

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work, all belong to the protection scope of the present invention. the

Please refer to accompanying drawing 1, which is a structural schematic diagram of a 10kV wiring circuit lightning protection device provided by an embodiment of the present utility model. The device includes: an insulator 101, a fittings top cap 102, a fittings chassis 103 and an epoxy cylinder, wherein:

The fitting top cap 102 is arranged on the top of the insulator 101 , the fitting chassis 103 is arranged on the bottom of the insulator 101 , and the epoxy barrel is arranged inside the insulator 101 . the

The metal top cap is provided with electrodes. The electrode does not need to puncture or strip the wire, and does not damage the insulation layer of the wire. the

The height of the lightning protection device provided by the embodiment of the present invention may be 280 mm, and the insulation distance of the insulator 101 may be 190 mm. the

The outer structure of the insulator 101 may be umbrella-shaped, and the umbrella-shaped structure may be called an umbrella group. the

Since the epoxy cylinder is disposed inside the insulator 101, it is not shown in FIG. 1 . the

Please refer to Fig. 2, which is a structural schematic diagram of the epoxy cylinder arranged inside the insulator in a 10kV wiring circuit lightning protection device provided by the embodiment of the present utility model. The epoxy cylinder includes: a gap cylinder 201, a first tapered copper sheet 202, the second tapered copper sheet 203 and the zinc oxide resistance sheet 204, wherein:

The first tapered copper sheet 202 is arranged on the top of the gap cylinder 201 , the second tapered copper sheet 203 is arranged on the bottom of the gap cylinder 201 , and the zinc oxide resistance sheet 204 is arranged below the second tapered copper sheet 203 . the

A zinc oxide resistor chip can include three zinc oxide resistors. the

The height of the gap cylinder 201 may be 80mm. the

The height of the gap cylinder 201 should comply with the power frequency discharge voltage ≥ 26kV and the impulse discharge voltage < 80kV. This function is mainly achieved by adjusting the height of the gap cylinder 201 and the material of the ceramic cylinder. the

The material of the epoxy cylinder can be glass fiber to increase the bending load resistance of the lightning protection device. The material of the gap cylinder can be ceramic, and the gap cylinder is the inner gap, which provides a channel for the lightning current and extinguishes the arc of the power frequency current in time. , the zinc oxide resistor is mainly responsible for leading the lightning current into the ground, and due to the nonlinear effect of the zinc oxide resistor, it can cut off the power frequency freewheeling even if there is a power frequency freewheeling flow. the

The main function of zinc oxide resistors is to release lightning current and suppress power frequency freewheeling. The amplitude of lightning current is between 4kA-20kA, and the maximum amplitude of power frequency freewheeling current is 15kA. The realization of this function is mainly determined by the diameter, thickness and quantity of zinc oxide resistors. The development and use of zinc oxide resistors is the key to ensure that the lightning protection device prevents lightning tripping. the

The epoxy barrel of the lightning protection device is made of glass fiber, which is the key to distinguish it from ordinary insulators. The use of glass fiber improves the bending load performance of the lightning protection device, which can meet the bending load requirements of 10kV insulators. the

The material of the first tapered copper sheet and the second tapered copper sheet is pure copper and plays a conductive role. the

The working process of the lightning protection device provided by the embodiment of the utility model is as follows: when the 10kV line is struck by lightning and the overvoltage does not reach the flashover voltage of the insulator, the inner gap starts to discharge, and when the overcurrent reaches a certain value, the channel of the zinc oxide resistor is opened, and the The excess current is discharged to the earth. When erected on an insulated wire, the power frequency freewheeling current cannot enter the inside of the insulator. Even if the power frequency freewheeling current starts arcing, the 80mm air gap is enough to extinguish the arc, and the power frequency freewheeling current can be cut off in time to prevent the line from tripping. the

The nonlinearity of the zinc oxide resistor means that under the lightning current, the zinc oxide resistor shows low impedance, while under the power frequency current, the zinc oxide resistor shows high impedance. the

Power frequency freewheeling: When electrical equipment discharges under the action of overvoltage, when the overvoltage disappears, then there will be power frequency current flowing, this current is the so-called power frequency freewheeling. (The power frequency refers to the nominal frequency value of the AC power system. The power frequency of my country's power system is 50Hz). the

According to the function of the lightning protection device, and referring to the technical conditions of the composite post insulator and the performance index of the post insulator for 10kV overhead conductors, the main electrical performance, mechanical performance and test requirements of the lightning protection device provided by the embodiment of the utility model are shown in the table 1. The inner gap distance of the lightning protection device should be enough to extinguish the power frequency arc, and the lightning protection device should pass the high-current impact withstand test, for example, it can withstand 4/10μs, 65kA high-current impact twice. The lightning protection device should pass the insulation test of the composite jacket, the lightning impulse withstands 125kV, positive and negative polarity each 15 times, the power frequency dry withstands 45kV, and the wet withstands 45kV for 1min each. The lightning protection device provided by the embodiment of the utility model can all realize the above indicators. the

Table 1

System voltage (kV) 10 Rated voltage (kV) 12 Impulse and discharge voltage (kV) <80 Shock resistance (kV) 125 Working discharge voltage (kV) ≥26 Power frequency tolerance (kV/1min) 45 2mS square wave (A) 200 Structure height (mm) 280 U5kA residual voltage (kV) <40 Insulation distance(mm) 190 Bending compound (kN) 6 Creepage distance (mm) 420

The 10kV wiring circuit lightning protection device provided by the embodiment of the utility model may also include screws arranged on the chassis of the hardware. the

The 10kV wiring circuit lightning protection device provided by the embodiment of the present invention may also include a load insulating jacket arranged on the outer surface of the insulator. the

To sum up, compared with the overvoltage protector in the prior art, the biggest advantage of the lightning protection device is that the lightning protection device integrates the outer gap of the overvoltage protector into the inside of the insulator, thereby transforming the discharge of the outer gap into the inner gap Discharge to ensure the stability of the discharge voltage. the

The overvoltage protectors in the prior art require the metal ring and the insulator to be in the concentric circle position during installation, but after long-term operation, most of them have a partial ring phenomenon, so that the metal ring and the insulator are not in the concentric circle position , and even the metal ring directly contacts the insulator, causing its discharge voltage to be unstable. In the final analysis, its operation problem is caused by its structural factors, and the outer gap discharge is the root of its easy problems. However, the lightning protection device provided by the embodiment of the utility model integrates the advantages of the overvoltage protector, and transfers the discharge gap to the inside of the insulator, thereby avoiding the occurrence of this problem. the

In addition, in terms of installation, the overvoltage protector in the prior art requires the vertical distance between the metal ring and the wire to be 80±10mm, and the insulator and the metal ring are in concentric circles, all of which increase the difficulty of installing the overvoltage protector , and the installation method of the lightning protection device provided by the embodiment of the utility model is the same as that of an ordinary insulator, and there is no need to adjust the distance, and the installation is simple and convenient. the

It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts in each embodiment, refer to each other, that is, Can

The above description of the disclosed embodiments enables those skilled in the art to realize or use the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein. the

Claims (9)

1. a 10kV wiring circuit lightning protection device, is characterized in that, comprising:

Insulator;

Be arranged on the gold utensil top cap on described insulator top, described gold utensil top cap is provided with electrode;

Be arranged on the gold utensil chassis of described insulator bottom, described gold utensil chassis is provided with metal electrode;

Be arranged on the epoxy cylinder of described insulator inside, described epoxy cylinder comprises gap cylinder, be arranged at the first taper copper sheet on cylinder top, described gap, be arranged at the second taper copper sheet of cylinder bottom, described gap, be arranged on the zinc oxide resistance sheet of described the second taper copper sheet below.

2. 10kV wiring circuit lightning protection device according to claim 1, is characterized in that, described lightning protection device is the lightning protection device for 280mm highly.

3. 10kV wiring circuit lightning protection device according to claim 1, is characterized in that, described insulator is that insulation distance is the insulator of 190mm.

4. 10kV wiring circuit lightning protection device according to claim 1, is characterized in that, described gap cylinder is the gap cylinder for 80mm highly.

5. 10kV wiring circuit lightning protection device according to claim 1, is characterized in that the epoxy cylinder that described epoxy cylinder is glass fibre.

6. 10kV wiring circuit lightning protection device according to claim 1, is characterized in that, described gap cylinder is ceramic gap cylinder.

7. 10kV wiring circuit lightning protection device according to claim 1, is characterized in that, described zinc oxide resistance sheet comprises three ZnO resistors.

8. 10kV wiring circuit lightning protection device according to claim 1, is characterized in that, also comprises:

Be arranged on the screw on described gold utensil chassis.

9. 10kV wiring circuit lightning protection device according to claim 1, is characterized in that, also comprises:

Be arranged on the load insulating coating of described outer surface of insulator.

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