CN201690227U - A kind of over-voltage protection device for overvoltage maintenance - Google Patents

Abstract

The utility model relates to an overvoltage protection device for overvoltage protection with live maintenance, which includes an insulator and a lightning arrester. The lower end is connected with the lower moving contact through a throwable and detachable drop mechanism. The utility model has the advantages of adopting multi-component combination and advanced structure, which can be detected, repaired and replaced during normal operation and electrified; the lightning arrester is easy to age after long-term operation, and when the service life is reached, the disconnector moves to produce visible signs; The ground is double-insulated to improve the reliability of operation; the detachment action is sensitive and the reliability is high.

Description

A kind of over-voltage protection device for overvoltage maintenance

technical field

The utility model relates to an overvoltage protector for distribution networks and substations, which can be used for overvoltage protection of distribution networks and substations, mainly for 10kV power transmission and transformation systems, and belongs to the technical field of overvoltage protection devices.

Background technique

Overvoltage protectors are widely used in the voltage field of 10kV and above due to their absolute advantages such as not being affected by the external environment, safe and reliable operation, and good protection characteristics, and are used to protect distribution networks and power transmission and transformation systems from overvoltages. . At present, the overvoltage of 10kV power transmission and transformation system adopts single-phase metal oxide arrester. After a period of operation, the arrester will lose its function if aging occurs. At this time there is no visible sign, and it is impossible to determine whether to replace it. When a new lightning arrester needs to be replaced, only live work or a power failure occurs when the line is switched off. Single-phase insulation is adopted, and there is no double insulation protection. All in all, the disadvantages of the existing overvoltage protectors are: live detection, maintenance and replacement are not possible; when the arrester fails, there is no visible sign; single-phase insulation reduces operational reliability.

Contents of the invention

The purpose of the utility model is to provide a metal oxide overvoltage protection device with visible fault marks for live maintenance.

In order to achieve the above purpose, the technical solution of the utility model is to provide a maintenance-type overvoltage protection device for breaking away from live electricity, including an insulator and a lightning arrester. , the lower end of the arrester is connected to the disconnector, and the lower end of the arrester is connected with the lower moving contact through a throwable and detachable drop mechanism.

The throwable and detachable drop-type mechanism includes a hoop, one end of the hoop is fixed to the lightning arrester, the other end is fixed to the lower bracket, and the contact shrapnel is connected to the lower moving contact and together with the lower moving contact Set on the lower bracket.

The utility model is that the lightning arrester and the insulator are arranged on the device which can fall freely, so as to realize free breaking.

The utility model has the advantages of adopting multi-component combination and advanced structure, which can be detected, repaired and replaced during normal operation and electrified; the lightning arrester is easy to age after long-term operation, and when the service life is reached, the disconnector moves to produce visible signs; The ground is double-insulated to improve the reliability of operation; the detachment action is sensitive and the reliability is high.

Description of drawings

Fig. 1 is a structural schematic diagram of an overvoltage protection device for overvoltage protection provided by the utility model.

Detailed ways

The utility model is described in detail below in conjunction with embodiment.

Example

As shown in Figure 1, a detached overvoltage protection device for overvoltage maintenance provided by the utility model consists of an insulator 1, an upper terminal assembly 2, an upper bracket 3, an upper moving contact 4, a lightning arrester 5, a hoop 6, Disconnector 7, contact shrapnel 8, lower bracket 9, and lower moving contact form 10.

The insulator 1 is installed on the upper end of the upper moving contact 4 through the upper terminal 2 and the upper bracket 3, and then the lightning arrester 5 is installed, the lower end of the lightning arrester 5 is connected to the disconnector 7, one end of the hoop 6 is fixed under the lightning arrester 5, and the other end is fixed on the lower bracket 9, the contact shrapnel 8 is connected to the lower moving contact 10 and installed together on the lower bracket.

The overvoltage protection device of the overvoltage protection device for breaking away from live maintenance is to skillfully install the surge arrester 5 on the throwable and detachable drop-type mechanism after refitting, so that the surge arrester can be conveniently operated with the help of the insulating switch control lever under the condition of uninterrupted power supply. Inspection, maintenance and replacement not only ensure the smooth flow of the line, but also greatly reduce the work intensity and time of power maintenance personnel, especially suitable for places where power outages are not suitable, such as communications, airports, stations, hospitals, bustling commercial areas, etc.

The live maintenance type overvoltage protector adds a disconnector 7. After the lightning arrester 5 is overcharged by lightning, if the appearance of the lightning arrester 5 is not damaged, it is difficult to find it by manual eye observation, which makes it time-consuming to find the fault point for repair. On the other hand, it has the characteristics of live maintenance. After the lightning arrester 5 fails, because it is still connected to the power grid, when replacing the new lightning arrester 5, it must either be live-worked, or the line should be switched off, which causes a lot of trouble for the repair and replacement work, and also delays the recovery of the power grid. time.

When the overvoltage protection device provided by the utility model breaks down, the power frequency short-circuit current is used to make the disconnector 7 act, so that the ground terminal of the disconnector 7 is automatically disengaged, and the lightning arrester 5 is overturned, and the operation is stopped to prevent further accidents. Expanded, and easy for maintenance personnel to find in time for maintenance and replacement. This detachment live maintenance overvoltage protection device adopts the most advanced thermal explosion detachment device in the world at present, which has the advantages of fast action speed, wide action current range, and can withstand the specified current impact and action load.

The metal oxide resistor used in arrester 5 has excellent nonlinear volt-ampere characteristics. When working, when atmospheric overvoltage or operating overvoltage occurs in the system, the metal oxide resistor shows low resistance, which limits the system overvoltage to within Low level, thus reliably protecting the power equipment; when the system is running normally, the metal oxide resistance sheet presents high resistance, and the arrester only passes the microampere current, and the system is isolated from the ground to ensure the normal operation of the system.

Claims (2)

1. one kind breaks away from hotline maintenance formula overvoltage protection; comprise insulator (1) and lightning arrester (5); it is characterized in that; insulator (1) is located at the upper end of moving contact (4) by upper connecting terminal (2) and upper bracket (3); the lower end dockingundocking device (7) of lightning arrester (5), the lower end of lightning arrester (5) by can throw, dismountable drop type mechanism links to each other with lower moving contact (10).

2. a kind of disengaging hotline maintenance formula overvoltage protection as claimed in claim 1; it is characterized in that; describedly throw, dismountable drop type mechanism comprises shroud ring (6); one end of shroud ring (6) and described lightning arrester (5) fix; the other end is fixed on the lower carriage (9); contact shell fragment (8) is connected on the lower moving contact (10), and is located on the lower carriage (9) with lower moving contact (10).

Images