JPH03182017A - Lightning arrester for power transmission lines - Google Patents

Abstract

PURPOSE:To make maintenance and inspection of a lightning arrester easy by supporting a lead wire on the steel tower and connecting the wire from electric discharge gaps to a lightning arrester installed in a place remote from a power line while supported by a steel tower. CONSTITUTION:When lightning hits power lines 4a, 4b, 4c or a steel tower 7, electric discharge is caused between gaps 5 in series and lightning current runs to lightning arresters 1a, 1b, 1c through lead wires 2a-2c. If the period from the starting of the current running to the lead wires 2a-2c and reaching the lightning arresters 1a-1c to the returning of reflected waves to the power lines 4a-4c is, for example, at most 0.1mus and the period is short enough as that level, without troubles, the power-transmission wires 4a-4c are protected from lightning. Consequently, the installation point of each of lightning arresters 1a-1c may be remote from the power lines 4a-4c and thus maintenance and inspection of the lightning arresters are carried out at low place.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lightning arrester used to prevent snow damage accidents on power transmission lines.

[Conventional technology]

Figure 2 shows, for example, a conventional lightning arrester for power transmission lines shown in page 13 of NGK Review Sales 49 supplementary volume published in March 1989.
1 is the electrode protruding from the power line 4, 5 is the lightning arrester 1 and the electrode 4
1, 6 is a suspension insulator that supports the power line 4, 7 is a steel tower, and 8 is an arm extending from the steel tower 7 and supporting the suspension insulator 6 and the lightning arrester 1.

Next, the operation will be explained. When the steel tower 7 or the power line 4 is struck by lightning, a large voltage is generated between the power line 4 and the arm 8. The part of the power line 4 that has the weakest dielectric strength against lightning voltage is set to be the part of the series gap 5. When the series gap 5 is discharged, the lightning current flows to the arrester 1, and the voltage drop of the arrester 1 is transferred to the power line. 4 and the arm 8, but the voltage drop is sufficiently lower than the voltage that discharges the suspension insulator 6, etc., so when the lightning voltage that occurs on the power line 4 is reduced, it does not directly discharge between the power line 4 and the arm 8. Since the lightning arrester 1 blocks the current flowing through the series gap 5,
In this way, the lightning strike voltage can be quickly removed without stopping power transmission by not flowing an alternating current due to the commercial frequency voltage that is constantly applied to the power line 4.

[Problem to be solved by the invention]

Conventional lightning arresters for power transmission lines are configured as described above, so when maintaining and inspecting the lightning arrester, it is necessary to get close to the power line and it is necessary to shut off the power, and the lightning arrester is located at the end of the arm. Therefore, there were problems such as inconvenience in maintaining and inspecting the lightning arrester.

This invention was made in order to solve the above-mentioned problems, and provides a lightning arrester for power transmission lines that allows lightning arresters to be maintained and inspected without power outage, and that allows for easy maintenance and inspection of the lightning arrester. With the goal.

[Means to solve the problem]

The lightning arrester for a power transmission line according to the present invention is one in which a plurality of lightning arresters are installed together on a pedestal in which the lightning arrester is installed at a low position on a steel tower, and each lightning arrester is connected to a series gap of each power line by a lead wire. .

[Effect]

In the lightning arrester for power transmission lines according to the present invention, the lightning arresters are arranged together at a low position on the tower, so that they are isolated from the power lines and can be maintained and inspected in one place.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 is a layout diagram showing the configuration of a lightning arrester for power transmission lines.
, lb, and lc are lightning arresters, and 2a, 2b, and 2c are the lightning arresters 1a and lb.

Lead wire attached to one end of 1c, 3 is lead wire 2
Support insulator supporting a, 2b, 2c, 5 is power line 4
a.

4b, 4c and the lead wires 2a, 2b, 2c, a series gap 9 is attached to the tower 7, and the lightning arrester 1a.

This is the stand on which Ib and lc are installed, and 6 to 8 are the same as the conventional equipment.

Next, the operation will be explained. Power lines 4a, 4b, 4
When there is a lightning strike on the lightning arresters 1a, 1b, and 7, electric discharge occurs in the series gap 5, similar to the conventional device, and lightning current flows through the lead wires 2a, 2b, and 2c to the lightning arresters 1a, Ib, and Ic. After the above-mentioned current starts flowing through the lead wires 2a, 2b, and 2c, the lightning arrester 1a.

The reflected waves reach power lines 4a, 4b,
The time it takes to return to 4c is from power lines 4a, 4b,
4c, but the above-mentioned time depends on the discharge voltage of the suspension insulator 6, for example, 0. 1, u or less, and if it is short like this, the power lines 4a, 4b, and 4c can be protected from lightning strikes without any problem.Therefore, each lightning arrester should be installed by extending the lead wire 2a from the top power line 4a to a lower position by about 15 m. Since it can be installed in the same location as other lightning arresters and isolated from the power lines 4a, 4b, and 4c, maintenance and inspection can be performed at a lower location without having to move around on the tower 7.

In the above embodiment, the lead wires 2a, 2b, and 2c are supported by the support insulator 3, but the lead wires 2a, 2b, and 2c are
If a, 2b, 2c are electric cables, support insulator 3
It is also possible to omit the above and attach a direct type cable to the steel tower 7.

〔Effect of the invention〕

As described above, according to the present invention, the lightning arrester is isolated from the power line at a low location on the steel tower, and a plurality of lightning arresters can be placed in the same place, so there is no need to interrupt the power outage during maintenance and inspection. This has the effect of making maintenance and inspection easier.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a route showing the configuration of an embodiment of the present invention;
FIG. 2 is a perspective view of a conventional lightning arrester for power transmission lines. In the figure, la, lb, lc are lightning arresters, 2a,
2b, 2c are lead wires, 3 is support insulator, 4a, 4b
, 4c is a power line, 5 is a series gap, 6 is a suspension insulator,
7 is a steel tower, 8 is an arm, and 9 is a pedestal. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] A lightning arrester is installed on a transmission line tower through a power line and a discharge gap, characterized in that a lead wire from the gap is supported by the tower and connected to the lightning arrester installed at a location away from the power line. Lightning arrester for power transmission lines.