CN206249973U - A kind of anti-thunder insulator for bare conductor - Google Patents

Abstract

This application provides a lightning protection insulator for bare wires, which is a new type of lightning protection insulator with a fault indicator for 10KV overhead bare wires. The insulator body and the fault indicator are used together. The insulator body includes a gap. During the process, when a lightning overvoltage strikes, as long as the magnitude of the overvoltage endangers the safety of the system, the gap between the copper sheets inside the insulator will be turned on instantaneously, and the overvoltage will leak into the ground through the resistor sheet, thereby avoiding Overvoltage builds up an arc and burns the wires, causing large-scale power outages or secondary accidents in the system, ensuring safe operation of the system. The utility model has the advantages of simple structure, good use effect, good economy and practicability, and is suitable for popularization and use. In addition, because this product is safe and reliable, it can greatly reduce the operation time and difficulty, gain valuable time for the power system to troubleshoot in time, effectively reduce the waste of resources, and save the limited space on the operation surface.

Description

A Lightning Protection Insulator for Bare Conductors

technical field

The utility model relates to the technical field of power transmission and protection equipment, in particular to a lightning protection insulator for bare wires.

Background technique

In overhead distribution lines, bare conductors play a pivotal role in power distribution operation and are an essential part. With the passage of time, the bare overhead conductors are exposed to the air for a long time, and the surface of the bare conductors is partially oxidized to form an oxide layer, which makes the bare conductors partially insulated. network, lightning strike disconnection accidents and line tripping caused by lightning strikes. Therefore, it is of great significance to speed up the research on measures to prevent insulator flashover, disconnection and tripping caused by lightning strikes on bare conductors to ensure the safe and reliable operation of distribution networks.

Utility model content

In view of this, the utility model provides a lightning protection insulator for bare wires to solve the problems of insulator flashover, disconnection and tripping caused by lightning strikes of bare wires in the prior art.

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

A lightning protection insulator for bare wires, comprising:

an insulator body and a fault indicator arranged under the insulator body, the insulator body and the fault indicator are fixedly connected by nuts;

The insulator body includes: an upper fitting, an umbrella body and a lower fitting, the lower end of the upper fitting is embedded and fixedly connected with the upper end of the umbrella body, the upper end of the lower fitting is embedded and fixedly connected with the lower end of the umbrella body, the upper A cavity is formed between the fittings, the umbrella body and the lower fittings, an insulating tube is arranged in the cavity, and two opposite tapered copper sheets and The resistor sheet, the two tapered copper sheets and the resistor sheet form a gap; the top of the insulator body includes a groove (108) for installing bare wires;

The fault indicator includes a signal acquisition system, a measurement control unit, a detonation unit, and an identification band action mechanism that are connected in sequence and form an integrated structure; the identification band action mechanism is provided with the identification band, and when the insulator body fails , the identification tape floats out from the fault indicator to indicate the fault point.

Preferably, the identification tape is an identification tape made of reflective material.

Preferably, the signal acquisition system is a current transformer.

Preferably, the measurement control unit includes a current measurement circuit, a comparator circuit, a trigger circuit and a protection circuit connected in sequence.

Preferably, the resistor sheet is a nonlinear zinc oxide resistor sheet.

Preferably, the umbrella is a porcelain umbrella or a vulcanized silicone rubber umbrella.

Preferably, a rubber insulating pad is provided between the fault indicator and the insulator body.

It can be seen from the above technical scheme that the lightning protection insulator for bare wires provided by the utility model is a new type of lightning protection insulator with a fault indicator for 10KV overhead bare wires. The insulator body and the fault indicator are used together. The insulator The main body includes a gap. During use, when there is a lightning overvoltage, as long as the magnitude of the overvoltage endangers the safety of the system, the gap between the copper sheets inside the insulator will be turned on instantly, and the overvoltage will pass through the resistor sheet. Leaking into the ground, so as to avoid burning the wire due to overvoltage arc building, causing large-scale power outages or secondary accidents in the system, and ensuring the safe operation of the system. The utility model has the advantages of simple structure, good use effect, good economy and practicability, and is suitable for popularization and use.

In addition, the fault indicator collects the current signal. When the current value does not reach the set value, the detonation action will not be started. When the current value reaches the set value, the detonation action will be started, and the identification tape will float out to indicate the damage of the lightning protection insulator. This product is safe and reliable, which paves the way for the wide application of lightning protection insulators, greatly reduces the operation time and difficulty, wins precious time for the power system to troubleshoot in time, effectively reduces the waste of resources, and saves the limited space of the operation surface, as well as self-recovery Designed to achieve true maintenance-free operation.

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.

Fig. 1 is a structural schematic diagram of a lightning protection insulator provided by the utility model;

Fig. 2 is a schematic diagram of the internal circuit structure of the fault indicator provided by the embodiment of the utility model.

detailed description

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 utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Please refer to Fig. 1, the utility model embodiment provides a lightning protection insulator, including: an insulator body 1 and a fault indicator 2 arranged under the insulator body 1, the insulator body 1 and the fault indicator 2 is fixedly connected by nut 3.

Wherein, the insulator body 1 includes: an upper fitting 101, an umbrella body 102 and a lower fitting 103, the lower end of the upper fitting 101 is embedded and fixedly connected with the upper end of the umbrella body 102, and the upper end of the lower fitting 103 is embedded and fixedly connected with the lower end of the umbrella body 102 , A cavity is formed between the upper fitting 101, the umbrella body 102 and the lower fitting 103, an insulating tube 104 is arranged in the cavity, and two opposite The tapered copper sheet 107 and the resistor sheet 105, two tapered copper sheets 107 and the resistor sheet 105 form a gap 106; the top of the insulator body 1 includes a groove 108 for installing bare wires.

The lightning protection insulator provided by the utility model is provided with an internal gap 106, and the discharge of the internal gap 106 is more stable. The internal gap 106 is composed of an upper fitting 101 , a lower fitting 103 , two tapered copper sheets 107 , a resistance sheet 105 and an insulating tube 104 . When the lightning acts, it discharges through the gap group, and when the lightning does not act, it isolates the line voltage through the gap to avoid the aging of the resistor sheet.

Among them, the resistor 105 is preferably a non-linear zinc oxide resistor, and the zinc oxide resistor is coated with a nano-scale high-resistance slurry, which has excellent high-current impact resistance. The insulating tube 104 is an epoxy lead rod, which has good bending resistance, and its mechanical load capacity is the same as that of ordinary insulators. In this embodiment, the specific material of the umbrella 102 of the insulator body is not limited, and it may be a vulcanized silicone rubber umbrella or a porcelain umbrella. Optionally, the porcelain umbrella body is used in this embodiment. Compared with the vulcanized silicone rubber umbrella body, the porcelain umbrella body can effectively improve the aging resistance and greatly increase the service life of the insulator body.

In this embodiment, the top of the insulator body 1 includes a groove 108 for installing bare wires. The bare wire is a 10KV overhead bare wire; because the lightning protection insulator provided by the utility model has a gap inside, even if the overhead bare wire is exposed to the air for a long time, a layer of oxide layer is formed on the surface of the bare wire, which makes the bare wire Local insulation, the setting of the internal gap of the lightning protection insulator, when there is a lightning strike overvoltage, as long as the amplitude of the overvoltage endangers the safety of the system operation, the gap inside the insulator will be turned on instantly, and the overvoltage will pass through the nonlinear resistor On the other hand, it can greatly reduce the line trip rate caused by lightning strikes and effectively improve the reliability of power supply.

As shown in Figure 2, the fault indicator 2 includes a signal acquisition system 21, a measurement control unit 22, a detonating unit 23 and an identification band action mechanism 24 connected in sequence and forming an integrated structure; the identification band action mechanism 24 is provided with an identification band 201, When the insulator body 1 fails, the identification tape 201 floats out from the fault indicator 2 to indicate the fault point. Wherein, the signal acquisition system 21 is a current transformer, and the measurement control unit 22 includes a current measurement circuit 221 , a comparator circuit 222 , a trigger circuit 223 and a protection circuit 224 connected in sequence.

In this embodiment, the fault indicator adopts current control action, and the fault indicator is passive, requiring no maintenance. The fault indicator collects the current signal. When the current value does not reach the set value, the detonation action will not be started. When the current value reaches the set value, the detonation action will be started, and the identification tape will float out to indicate the damage of the lightning protection insulator. This product is safe and reliable, which paves the way for the wide application of lightning protection insulators, greatly reduces the operation time and difficulty, wins precious time for the power system to troubleshoot in time, effectively reduces the waste of resources, and saves the limited space of the operation surface, as well as self-recovery Designed to achieve true maintenance-free operation.

In this embodiment, a rubber insulating pad is also provided between the fault indicator 2 and the insulator body 1 . The insulator body 1 and the fault indicator 2 are fixed on the cross arm through the screw end of the lower fitting 103 and the nut 3 . A rubber insulation pad can also be included between the fault indicator 2 and the cross arm for insulation.

The lightning protection insulator provided by the utility model organically combines an insulator, a lightning arrester and a fault indicator, and adopts a column structure and a built-in gap design. The lightning protection insulator provided by the utility model, on the one hand, acts as an insulator at normal voltage, and when lightning overvoltage strikes, as long as the amplitude of the overvoltage endangers the safety of the system, the gap inside the insulator will be instantly turned on , the overvoltage is leaked into the ground through the non-linear resistor, so as to play the role of a lightning arrester; on the other hand, it can greatly reduce the line tripping rate caused by lightning strikes, and effectively improve the reliability of power supply.

In addition, the insulator cleverly uses the oxide layer of the bare overhead wire as the discharge medium, thereby forming a stable discharge gap between the core wire of the bare wire and the fittings, and forming a series gap together with the built-in gap of the lightning protection insulator, thereby effectively solving the problem of It solves the problems of other similar lightning protection devices in the wiring construction, greatly improves the labor efficiency, reduces the labor intensity of the construction workers, and improves the reliability of the action at the same time.

Further, due to the addition of a fault indicator, once the insulator body fails, the fault point can also be displayed through the fault indicator, which reduces the need to find the fault point after the overhead bare wire is intact and the lightning protection insulator is damaged by lightning, saving labor. Find time and effort.

The lightning protection insulator provided by the utility model has at least the following advantages:

(1) The insulator and the fault indicator are combined into one, thereby avoiding repeated construction, effectively reducing the labor intensity of construction workers, improving work efficiency, and at the same time ensuring the limited space of the tower to the greatest extent.

(2) The device has an internal gap for more stable discharge. When the lightning acts, it discharges through the gap group, and when the lightning does not act, it isolates the line voltage through the gap to avoid the aging of the zinc oxide resistor sheet.

(3) When the lightning protection insulator body fails (internal insulation failure), the lightning protection insulator fault indicator starts to act, and the indicator floats out of the identification tape. The identification tape is made of reflective material, which is convenient for line inspection to find fault points, greatly reduces the inspection time and work intensity of line inspectors, and wins valuable time for timely restoration of normal power supply. The indicator is passive and maintenance-free.

(4) The protection level and action stability of the device will not be affected by humans.

(5) The resistance sheet and the gap are inserted into the epoxy lead rod, which has good bending resistance, and its mechanical load capacity is the same as that of ordinary insulators. The installation of this device is the same as that of ordinary insulators. Install.

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.

It should also be noted that in this article, relational terms such as first and second etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations Any such actual relationship or order exists between. Moreover, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that an article or device comprising a set of elements includes not only those elements but also other elements not expressly listed, Or also include elements inherent in the article or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in an article or device comprising the aforementioned element.

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.

Claims (7)

1. A lightning protection insulator for bare wires, characterized in that it comprises: An insulator body (1) and a fault indicator (2) arranged under the insulator body (1), the insulator body (1) and the fault indicator (2) are fixedly connected by a nut (3); The insulator body (1) includes: an upper fitting (101), an umbrella body (102) and a lower fitting (103), the lower end of the upper fitting (101) is embedded and fixedly connected to the upper end of the umbrella body (102), the The upper end of the lower fittings (103) is embedded and fixedly connected with the lower end of the umbrella body (102), and a cavity is formed between the upper fittings (101), the umbrella body (102) and the lower fittings (103). An insulating tube (104) is provided in the cavity, and two opposite tapered copper sheets (107) and resistance sheet (105), the two tapered copper sheets (107) and the resistance sheet (105) form a gap (106); the top of the insulator body (1) includes a groove (108) for installing bare wires ; The fault indicator (2) includes a signal acquisition system (21), a measurement control unit (22), a detonating unit (23) and an identification band action mechanism (24) connected in sequence and forming an integrated structure; the identification band action mechanism (24) is provided with the identification tape (201), when the insulator body (1) fails, the identification tape (201) floats out from the fault indicator (2) to indicate the fault point. 2. The lightning protection insulator for bare wires according to claim 1, characterized in that, the identification tape (201) is an identification tape made of reflective material. 3. The lightning protection insulator for bare conductors according to claim 2, characterized in that the signal acquisition system (21) is a current transformer. 4. The lightning protection insulator for bare conductor according to claim 3, characterized in that, the measurement control unit (22) comprises a current measurement circuit (221), a comparator circuit (222), a trigger circuit connected in sequence (223) and protection circuit (224). 5. The lightning protection insulator for bare wires according to claim 1, characterized in that, the resistor (105) is a non-linear zinc oxide resistor. 6. The lightning protection insulator for bare wires according to claim 1, characterized in that, the umbrella (102) is a porcelain umbrella or a vulcanized silicon rubber umbrella. 7. The lightning protection insulator for bare wires according to claim 1, characterized in that a rubber insulating pad is provided between the fault indicator (2) and the insulator body (1).