Insulator type voltage limiter with grounding function

Abstract

The invention, which belongs to the technical field of lightning protection of the distribution line, provides an insulator type voltage limiter with the grounding function. The insulator type voltagelimiter is characterized in that a bleeder part includes an insulating core rod (10); an upper armour clamp (2) and a lower armour clamp (6) are fixed at the upper end and the lower end of the insulating core rod (10) respectively; the upper armour clamp (2) supports an overhead distribution line (1); an annular electrode (5) is arranged between an insulating support section (3) and a bleeder section (4); and a plurality of valve blocks (11) are arranged between the annular electrode (5) and the lower armour clamp (6) in a contact manner. Besides, a grounding part (8) is also arranged; the lower armour clamp (6) is connected to the upper end of the grounding part (8); and the lower end of the grounding part (8) is connected to the ground (9). According to the insulator type voltage limiter, because the bleeder section with the valve blocks is arranged at the lower armour clamp, the valve blocks are insulated with the overhead distribution line in a normal state, so that the valve blocks are in a low potential state and are not in conduction until being hit by lightning strikes. Therefore, the service life of each valve block is prolonged substantially.

Description

technical field [0001] An insulator type voltage limiter with a grounding function belongs to the technical field of lightning protection for distribution lines. Background technique [0002] The overhead power distribution line is a first-class power supply network directly connected to the user, and its operation stability and safety are directly related to the user's power quality and safety. Because the insulation level of distribution lines is low, the operating environment of the lines is relatively complicated, and generally no special lightning protection measures are taken, so they are very vulnerable to lightning hazards. The overvoltage caused by direct lightning and the overvoltage caused by induced lightning can cause The flashover of the line insulation causes the line to trip and blackout. In areas with strong lightning activities, lightning strikes and power outages often occur on the distribution lines, and the reliability and stability of the system power s...

AI Technical Summary

Problems solved by technology

In some areas with high soil resistivity, the grounding resistance of the tower when it is naturally grounded is difficult to meet the actual engineering requirements

At this time, even if a voltage limiter is used along the distribution line, when the line is subjected to lightning overvoltage and the current discharge device operates, due to the large grounding resistance of the tower, the lightning overvoltage on the line may still exceed the insulation level of the line at this time, resulting in Counterattack, causing line insulation flashover

[0004] In the patent No. 201320303847.8, a built-in column pressure limiter for overhead wires is disclosed, but there are still some shortcomings in this patent: (1) In this patent, through the common zinc oxide valve in this field However, in this patent, the zinc oxide valve plate is always in contact with the overhead power distribution line under normal conditions, so the zinc oxide valve plate is always at a high potential. The setting method of this valve plate and the gap must be To a certain extent, it affects the service life of the zinc oxide valve plate

(2) In this patent, the zinc oxide valve plate and the internal electrodes at both ends are set on the outside of a core tube, and then the core tube is set on the outside of the insulating mandrel, so its structure is more complicated, and at the same time it increases Difficulty of processing

Images