JPH052542U - Lightning protection device for power transmission lines - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose is to save the installation space of the lightning arrester installed in the transmission line. [Structure] By constructing a disconnecting section 5 consisting of a fixed contact 3 and a movable contact 4 by an insulator 6 and an insulator zinc oxide arrester 10 whose one end is grounded by a ground wire 9,
It is possible to halve the installation space.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a lightning arrester used in a high-voltage or extra-high-voltage transmission line.

[0002]

[Prior Art]

 BACKGROUND ART Conventionally, lightning arresters have been used to protect the insulation of power system facilities and equipment such as transmission and transformation equipment from overvoltage such as lightning surges. Fig. 3 shows an example of the structure of the lightning arrester installed on the transmission line of high voltage (more than 7kV or less than low voltage) or extra high voltage (more than 7kV). The branch line r, s, t branched from the three-phase busbars R, S, T of the transmission line C is connected to the line switch A, and the line r is connected between this line switch A and the arrester B. They are connected by ', s', t', and one end of the arrester B is grounded.

FIG. 4 is a side view showing the installed state of the lightning arrester, but the busbars R, S, T of the power transmission line C are suspended by an insulator 2 fixed to a gate-shaped column 1, for example. The electric circuit switch A is composed of a disconnecting section 5 composed of a fixed contact 3 and a movable contact 4, and insulators 6 and 7 which insulate and support the disconnecting section 5, which are mounted on a support frame 8. Further, as the arrester B, an insulator type zinc oxide arrester 10 whose one end is normally grounded by a ground wire 9 is used and is supported by a support base 11. Here, the insulator zinc oxide arrester 10 will be described in more detail. As shown in FIG. 5, the zinc oxide elements 13 stacked in the insulator tube 12 are insulated rods (or insulating cylinders) 14, springs 15, fixed parts 16 and the like. It is maintained and connected by. Usually, pressure release parts 17 and 17 are provided on the upper and lower parts thereof, and a desiccant 18 filled with dry air or nitrogen gas is provided in order to prevent characteristic changes of the zinc oxide element due to moisture absorption and deterioration of insulation of structural parts. It is provided. Furthermore, a ground terminal 19 is provided at the lower end of the porcelain bushing 12 (see, for example, the new edition of the Electrical Engineering Handbook (edited by The Institute of Electrical Engineers, February 1988, p. 830)).

[0004]

[Problems to be solved by the device]

However, when the conventional lightning arrester as described above is adopted, there is a drawback that a lot of installation space is required. That is, for example, in the case of extra-high voltage, a distance of about 6 m is required between the gate-shaped support 1 and the support stand 8 for the electric circuit switch A in FIG. Up to 11 still requires an interval of about 6 m. Since the required width is usually 3 to 5 m, the installation area of one set of lightning arrester needs to be as large as 36 to 60 m ² . Since it is necessary to install such a lightning arrester at a predetermined interval such as 25 to 50 m, there is a problem that the installation cost becomes high.

The present invention has been made in order to solve such a problem, and an object thereof is to provide a lightning arrester for a transmission line that can be installed with a small space.

[0006]

[Means for Solving the Problems]

 The present invention is a transmission line characterized in that one insulator of an electric circuit breaker in which a disconnecting portion composed of a fixed contact and a movable contact is supported by a plurality of insulators is an insulator type zinc oxide surge arrester. Lightning arrester.

[0007]

[Work]

 According to the lightning arrester of the present invention, the conventional circuit breaker and the insulator-type zinc oxide lightning arrester are integrally configured, so that the installation required conventionally is not impaired without impairing the function of the original lightning arrester. It is possible to reduce the space by half.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the lightning arrester of the present invention includes two insulators 6 and 7 that insulate and support a disconnecting portion 5 composed of a fixed contact 3 and a movable contact 4 placed on a support base 8. In the conventional electric circuit switch A consisting of, a lightning arrester B consisting of an insulator type zinc oxide type arrester 10 of which one end is grounded by a ground wire 9 is arranged in place of one insulator 7 of the two insulators. This is what I did. Since it is necessary to twist the fixed contactor 3 and the movable contactor 4 of the electric circuit switch A in the lateral direction, as shown in FIG. It is configured to be freely contactable.

By using the lightning arrester in which the electric circuit breaker A and the lightning arrester B are integrally formed in this way, the installation space for the lightning arrester B, which has been conventionally required, is unnecessary, and the installation is performed in only half the space. It is possible to

[0010]

[Effect of the device]

 According to the present invention, the conventional circuit breaker and the lightning arrester are integrally configured, which contributes to space saving and cost saving.

[Brief description of drawings]

FIG. 1 is a partial side view showing an embodiment of a lightning arrester of the present invention.

FIG. 2 is a partial side view showing an enlarged part D of FIG.

FIG. 3 is a configuration diagram of a conventional lightning protection device.

FIG. 4 is a side view of a conventional lightning protection device.

FIG. 5 is a side sectional view of a conventional zinc oxide type arrester.

[Explanation of symbols]

 3 Fixed contactor 4 Movable contactor 5 Disconnection part 6 Insulator 8 Support stand 9 Earth wire 10 Insulator type zinc oxide type arrester 20 Brush 21 Conductive part A Electrical circuit switch B Lightning arrester

Claims (1)

[Claims for utility model registration] [Claim 1] One insulator of an electric circuit switch having a disconnection portion composed of a fixed contact and a movable contact supported by a plurality of insulators, and an insulator zinc oxide surge arrester. A lightning protection device for a transmission line characterized by the above.