JPS62290308A - Steel tower - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Object of the Invention] (Field of Industrial Application) The present invention relates to steel towers, and particularly to prevention of lightning disasters in substations.

(Prior Art) As shown in Fig. 2, a conventional substation tower supports an overhead ground wire 2 at the top of a support section 1 of the tower, and connects the overhead ground wire with an insulator 4 to the support section 1 of the tower. A power line 3 is supported below 2. At points A and B, substation equipment 1 such as a transformer, a disconnector, a lightning arrester, an instrument transformer, an instrument current transformer, etc. are connected to the power line 3 at points A and B. Another fictitious one!
2 is provided above the power line 3 to obtain a shielding effect, as described above, to prevent lightning strikes from directly hitting the power line 3.

(Problem to be solved by the invention) In Figure 2, at point P and t4! When a lightning current flows through the support part 1 of the steel tower and the overhead ground wire 2, the potential at point P increases impulsively, and the potential at the support point Q of the insulator chain 4 also increases almost proportionally. Then, an FM'A electric voltage is applied to both ends of the insulator chain 4, and when this impact voltage exceeds the breakdown voltage between both ends of the insulator chain 4, a flashover occurs. As a result, lightning surge voltage enters the power line 3 and threatens the insulation of the substation equipment connected to points A and B.6 The present invention has been made in consideration of the above points, and has achieved its purpose. The object of the present invention is to provide a steel tower that prevents the insulation of substation equipment from being compromised even if a direct lightning strike occurs on the supporting part of the tower for an overhead ground wire.

[Structure of the invention]

(Means and effects for solving the problem) A steel tower installed in a substation is installed to support the overhead ground wire, and another power line support tower installed in parallel with this tower supports the power line with an insulator chain to support the power line below the overhead ground wire. By arranging and forming a power line on the power line and connecting the substation's electrical equipment to this power line, even if the support tower supporting the overhead ground wire is struck by lightning, the power line support tower on the power line side can be installed separately. In addition, since the power line is installed below the overhead ground wire, there is no impact voltage applied between both ends of the insulator chain, which occurs in the past, and this prevents the insulator chain from being shattered by lightning strikes. Because it can do so, the insulation of various electrical devices connected to this power line is not impaired.

(Example) An example of the steel tower of the present invention will be described below with reference to FIG. The same parts as in FIG. 2 are given the same reference numerals. An overhead ground wire 2 is supported at the top of a support tower 10 of a steel tower in a substation, and a power line support tower 11 is provided in parallel with this support tower 10. This power line support tower 11 supports the power line 3 via the insulator 4,
This power line 3 is arranged below the overhead ground wire 2. Furthermore, various electric devices (not shown) of a substation are connected to points A and B of this power line 3.

Even if there is a lightning strike at point P of the support tower 10 that supports the overhead ground wire 2 and the potential at point P rises shockingly, the power line support tower 11 that supports the power line 3 via the insulator 4 is 10
Since the power line 2 is arranged separately and in parallel with the overhead ground wire 2, and the power line 2 is arranged below the overhead ground wire 2, the potential of the power line support tower 11 does not rise. Therefore, an impact voltage due to a lightning strike is not applied between both ends of the insulator chain 4, and a flashover between both ends of the insulator chain 4 is prevented.

〔Effect of the invention〕

As explained above, according to the present invention, the power line is supported via an insulator chain on a power line support tower installed in parallel with the support tower supporting the overhead ground wire, and the power line is arranged below the overhead ground wire. By installing T:! on the overhead ground wire or the support tower supporting it at the substation. Even if there is a power line, no WI shock potential is applied between both ends of the insulator chain that supports the power line of the power line support tower, thus preventing the insulator chain from flashing and preventing lightning surge voltage from entering the power line. is,
It is possible to provide a steel tower that can prevent insulation breakdown of various electrical devices connected to power lines.

[Brief explanation of the drawing]

FIG. 1 is a front view of a steel tower according to the present invention, and FIG. 2 is a front view of a conventional steel tower.

Claims (1)

[Claims] The power line is supported by a support tower supporting an overhead ground wire, and a separate power line support tower installed in parallel with the support tower through an insulator chain, and the power line is disposed below the overhead ground wire. Steel tower.