CN204905826U - Take disconnector fixed interval overvoltage protection device - Google Patents

Abstract

The utility model is a fixed-gap overvoltage protector with a disconnector. The structure of the arrester with insulated wires is connected with the insulator circuit crossarm through an insulating bracket and an anti-slip installation bracket. The hoop is connected with the 10kV overhead insulated wire, and the built-in insulator of the arrester is installed on the lower part of the arrester with insulated wire. One end of the disconnector is connected, and the other end of the disconnector is connected to the B fixing hole of the anti-slip mounting bracket and insulating bracket through a bare copper wire. Advantages: The discharge gap does not need to be adjusted, and the discharge performance of the two electrodes is stable. When the arrester fails abnormally, the disconnector operates, and the ground terminal of the disconnector is automatically disconnected. Click for maintenance.

Description

Fixed gap overvoltage protector with disconnector

technical field

The utility model relates to an overvoltage protector with a disconnector and a fixed gap, which is used for overvoltage protection of power distribution grids and substations. It belongs to the field of overhead line protection of distribution network.

Background technique

The current lightning arrester is widely used in the distribution network of 10kV and above because of its good protection performance and no external environment influence. Most of the overhead insulated lines are struck by induction lightning. When the lightning overvoltage flashes over, because the overvoltage protector is connected in parallel with the line insulator, the high potential caused by the lightning current will make the series gap of the overvoltage protector act, reducing the load on the tower arm and the conductor. To ensure the insulator no longer flashover, thereby avoiding line tripping and power failure, in order to ensure the normal operation of the overvoltage protector, it is necessary to ensure that the gap distance between the external discharge electrodes is within the specified range. In the existing fixed-gap overvoltage protector technology, if the insulation is broken down by lightning, a direct grounding fault will occur on the line, affecting the normal power supply, and the maintenance is not easy to be found.

Contents of the invention

The utility model proposes a fixed-gap overvoltage protector with a detachment device, which aims to overcome the above-mentioned defects in the prior art and solve the direct grounding fault of the existing fixed-gap overvoltage protector due to insulation breakdown. And maintenance is not easy to find problems.

The technical solution of the utility model: the overvoltage protector with a fixed gap with a disconnector, its structure is that the lightning arrester 8 with an insulated wire is connected with the insulator circuit cross arm commonly used for 10kV overhead insulated lines through the insulating bracket 5 and the anti-slip mounting bracket 1, The lightning arrester 8 of the insulated wire is connected to the piercing throat hoop 13 through the insulated copper wire 7, and the piercing throat hoop 13 is connected to the 10kV overhead insulated wire 6, and the built-in insulator 10 of the lightning arrester is installed on the lower part of the lightning arrester 8 with the insulated wire, and the lightning arrester 8 with the insulated wire is connected to the built-in lightning arrester. The right discharge electrode base 9 is installed between the insulators 10, the right discharge electrode 4 is connected with the right discharge electrode base 9 by bolts, and the lower part of the built-in insulator 10 of the arrester passes through the A fixing hole 15 of the insulating bracket 5 and the disconnector 11 by bolts. One end is connected, and the other end of the disconnector 11 is connected with the B fixing hole 16 of the anti-slip mounting bracket 1 and the insulating bracket 5 through the bare copper wire 2 .

The utility model has the advantages of no need to adjust the discharge gap, and the discharge performance of the two electrodes is stable. When the arrester fails abnormally, the disconnector will act in time, so that the grounding end of the disconnector will be automatically disengaged, the arrester will stop running, and the fault arrester will be displayed. The permanent fault is separated from the mark, which is convenient for maintenance personnel to find the fault point in time for maintenance.

Description of drawings

Accompanying drawing 1, 2 are the structure diagrams of the overvoltage protector with a disconnector and a fixed gap.

In the figure, 1 is the anti-slip mounting bracket, 2 is the bare copper wire, 3 is the left discharge electrode, 4 is the right discharge electrode, 5 is the insulating bracket, 6 is the 10kV overhead insulated wire, 7 is the insulated copper wire, 8 is the insulated wire Arrester, 9 is the right discharge electrode base, 10 is the built-in insulator of the arrester, 11 is the disconnector, 12 is the wire fixing nut of the disconnector, 13 is the puncture throat hoop, 14 is the installation positioning hole, 15 is the A fixing hole, 16 is the B fixing hole.

Detailed ways

Comparing with accompanying drawings 1 and 2, its structure is that the lightning arrester 8 with insulated wires is connected with the insulator circuit crossarm commonly used in 10kV overhead insulated lines through the insulating bracket 5 and the anti-slip mounting bracket 1, and the lightning arrester 8 is connected with the puncture throat through the insulated copper wire 7 Hoop 13, puncture throat hoop 13 is connected with 10kV overhead insulated wire 6, install arrester built-in insulator 10 at the lower part of insulated wire arrester 8, and install right discharge electrode base 9 between the insulated wire arrester 8 and arrester built-in insulator 10, right The discharge electrode 4 is connected to the right discharge electrode base 9 through bolts, and the lower part of the built-in insulator 10 of the arrester is connected to one end of the disconnector 11 through the A fixing hole 15 of the insulating bracket 5 through bolts, and the other end of the disconnector 11 is passed through a bare copper wire 2. Connect with the B fixing hole 16 of the anti-slip mounting bracket 1 and the insulating bracket 5.

The anti-slip installation bracket 1 is installed and positioned through the installation positioning hole 14 and the insulating bracket 5 .

The insulating bracket 5 and the disconnector 11 are installed and positioned.

The horizontal distance between the left discharge electrode 3 and the right discharge electrode 4 is 20-80 mm.

The electrodes of the left discharge electrode 3 and the right discharge electrode 4 are spherical, conical and other shapes.

When working, when the arrester fails abnormally, the disconnector will act in time, and use the power frequency short-circuit current to heat the fast thermal resistance sheet inside the disconnector, detonate the air burst tube, automatically disconnect the ground terminal of the disconnector, and the arrester will stop running; prevent The accident was further expanded, and the fault arrester was given a visible detachment mark, so that the maintenance personnel could find the fault point in time for maintenance and replacement. The disconnector explodes into two parts, one part is still connected to the lower electrode and can be disassembled together with the arrester part. The other part of the disconnector is suspended under the fixed bracket because of the copper wire. When the arrester is in the normal working state, the disconnector does not act and shows low impedance (compared with the arrester), which does not affect the original working state of the system and the protection characteristics of the arrester, ensuring uninterrupted power supply.

Claims (4)

1. be with disconnector fixed interval (FI) overvoltage protection device, it is characterized in that the lightning arrester with insulated conductor is connected with the insulator circuit cross-arm that 10kV insulated overhead line is commonly used by insulating support and anti-slip mounting bracket, lightning arrester connects puncture larynx hoop by insulated copper wire, puncture larynx hoop connects with 10kV suspended insulated guide wire, at bottom zinc oxide surge arresters built-in insulation of having insulation conducting wire lightning arrester, right sparking electrode base is installed between having insulation conducting wire lightning arrester and lightning arrester built-in insulation, right sparking electrode is connected with right sparking electrode base by bolt, the bottom of lightning arrester built-in insulation is connected with one end of disconnector by the A fixing hole of bolt through insulating support, the other end of disconnector is by naked copper wire and anti-slip mounting bracket (1), the B fixing hole of insulating support connects.

2. band disconnector fixed interval (FI) according to claim 1 overvoltage protection device, is characterized in that described anti-slip mounting bracket installs location by mounting-positioning holes and insulating support.

3. band disconnector fixed interval (FI) according to claim 1 overvoltage protection device, is characterized in that the horizontal range between described right sparking electrode and left sparking electrode is 20 ~ 80mm.

4. band disconnector fixed interval (FI) according to claim 1 overvoltage protection device, is characterized in that the electrode of described right sparking electrode and left sparking electrode is spherical in shape, conical.