JPS6025834Y2 - Surge arrester with disconnector for compact power substation equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lightning arrester with a disconnector for a compact volume transformer.

In general, compact power receiving and transforming equipment is equipped with lightning arresters to absorb abnormal voltages that occur in the power system, such as lightning surges and switching surges that occur when switching circuit breakers, etc. Also, withstand voltage tests of cables and switchgear A disconnect switch is provided to disconnect the lightning arrester in the event of a surge arrester.

However, since a disconnector is provided in addition to the lightning arrester, this is not preferable from the viewpoint of downsizing the power receiving and transforming device.

An object of the present invention is to eliminate the above-mentioned drawbacks and provide a lightning arrester with a disconnector for a reduced-sized power substation device, which makes it possible to downsize the reduced-sized power receiving/transforming device.

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

Figures 1 and 2 show the normal state and disconnected state of the lightning arrester, respectively, where 1 is a lightning arrester element made of a non-linear resistor, 2 is a capacitor cone with the surge arrester element 1 built in, and the lightning arrester element 1 and the capacitor cone 2 are used to provide lightning protection. This constitutes the main body 3.

4 is a grounding container of the oil-filled switchgear, 5 is a case provided in the grounding container 4, and the lightning arrester main body 3 is inserted into the case 5,
A conductive member 7 attached to the upper end of the capacitor cone 2 and in contact with the upper electrode 6 of the lightning arrester element 1 is fixed with a bolt 9 via an oil-tight packing 8.

14 is an electrode provided at the bottom of the arrester element 1; 15 is a conductor provided at the bottom of the electrode 14; the lower end of the conductor 15 (
It is also the lower end of the capacitor cone 2.

) is formed with a movable side contact 16.

Reference numeral 17 denotes a fixed contact provided in the case 5, and the fixed contact 17 is removably fitted into the movable contact 16.

The grounded container 4 and case 5 are filled with oil.

Further, FIG. 3 shows a single line diagram of the oil-filled switchgear. 10 is a lightning arrester according to this embodiment, 11 is a cable head, 12 is a disconnector with a grounding mechanism, and 13 is a breaker.

In the lightning arrester having the above configuration, when performing a dielectric strength test of the cable or switchgear, remove the bolt 9 in the normal length state shown in Fig. 1, and pull up the lightning arrester body 3 with a manual jack or the like to fit it into the fixed side contact 17. As shown in FIG. 2, the movable side contact 16 that was in contact with the fixed side contact 17 is separated from the fixed side contact 17 to perform a disconnection operation, and the lightning arrester 10 is electrically disconnected from the switching device.

As described above, in the present invention, the main body of the lightning arrester is movably provided in the case formed inside the grounding container of the oil-filled switchgear, and in this way, each component of the switchgear, including the lightning arrester, is placed in the same container. In addition, since the lightning arrester itself has a disconnection function, there is no need to install a disconnector in the oil-immersed switchgear, and it is possible to downsize the oil-immersed switchgear and power receiving and transforming equipment, including the oil-immersed switchgear. .

In addition, since the case is filled with oil, the arrester body is immersed in oil, and a capacitor cone is formed around the arrester body to make the electric field uniform in the arrester body. As a result, the spacing between the contacts and the spacing between the arrester body and the case can be reduced, which also promotes miniaturization.

Furthermore, by covering the main body of the lightning arrester with the case, it is possible to prevent damage to the lightning arrester from spreading to other equipment in the escape switch.

[Brief explanation of drawings]

1 and 2 are longitudinal sectional front views of the lightning arrester according to the present invention in a normal state and a disconnected state, respectively, and FIG. 3 is a single line diagram of an oil-immersed switchgear using the lightning arrester according to the present invention. 1... Lightning arrester element, 2... Capacitor cone, 3... Lightning arrester body, 4... Earthing container, 5... Case, 16 ...Movable side contact, 17...Fixed side contact.

Claims (1)

[Scope of utility model registration request] A lightning arrester body consisting of a lightning arrester element built in a capacitor cone, which is activated by a non-linear resistor, is movably provided in a case formed in the grounding container of the oil-filled switchgear. A disconnector for a compact volume transformer, characterized in that an electrically connected movable contact is provided, and the movable contact is brought into contact with and separated from a fixed contact provided in the case by movement of the lightning arrester body. Lightning arrester.