Switch of high-voltage electric apparatus

Abstract

To provide a switch of a high-voltage electric apparatus that 1. downsizes a UAS or suppresses an electric spark and arc generation in the UAS, and 2. contributes to prevention of global warming by reducing the use of a global warming gas enclosed in a UGS.SOLUTION: According to the present invention: 1. an electric power switch is inserted into a box body (for example a UAS); 2. nitrogen gas is enclosed in the box body (the UAS) at a pressure of 0.98 MPa (it is known by Paschen's law that a discharge starting voltage (insulation breakdown voltage) increases approximately in proportion to a gas pressure by increasing a gas pressure); 3. a cutting-off performance of the electric power switch (the UAS) is enhanced.

Description

[Technical Field]

[0001] This invention is an improvement of the UGS (Under Ground Gas Switch) and UAS (Under Ground Air Switch). The following modifications are made to the UAS housing (the can containing the switch). 1. Attach a sealing gasket to the box to prevent compressed air from leaking from the box. 2. A pressure gauge and a pressure drop indicator are added to the housing. 3. The UAS box is filled with dried compressed air or nitrogen at 0.98 MPa. Technical background

[0002] There are UGS and UAS switches as prior art of this type, but the following improvements can be expected by sealing dry air (preferably nitrogen) at 0.98 MPa. Taking into account impurities in the atmosphere, the breakdown voltage is as follows: Atmosphere: 1 atmosphere, electrode distance: 1 mm, breakdown voltage: approx. 1 kV Atmosphere: 2 atmospheres, electrode distance: 1 mm, breakdown voltage: approx. 2 kV Using the above characteristics, when the atmosphere is 0.98 MPa (approximately 10 atmospheres) and the electrode distance is 1 mm, the breakdown voltage is approximately 10 kV. Although this may differ from the actual situation, the improvement in the insulation capacity of UAS is certain. [Prior art documents]

[0003] [Patent documents] [Patent documents] UAS, UGS

[0004] [Non-patent literature] [Non-patent literature] ReferencesPaschen's Law Summary of the Invention [Problem to be solved by the invention]

[0005] Countermeasures against global warming and miniaturization of electrical equipment switches [Means for solving the problem]

[0006] Increasing the pressure inside the housing of an electrical equipment switch increases the breakdown voltage. [Effects of the Invention]

[0007] The miniaturization of UAS allows for a smaller installation surface. With a UGS, if SF6 gas leaks from inside the housing, the on / off switch becomes unusable, but with the product of this invention, if a pressure drop occurs, a valve or the like is installed in advance, and dry air or nitrogen is sealed in at the specified amount, allowing the switch to be opened and closed in an emergency.

Claims

1. The switch used in the electrical equipment is inserted into the sealed box, and a valve and a pressure gauge are attached.

2. By pressurizing and sealing air or nitrogen into the housing through the valve installed as described in claim 1, the electrical insulation performance can be improved according to the pressure.

3. If the pressure in the box drops, pressurize it with compressed air or compressed nitrogen, and when the gauge pressure returns to the specified value, the insulation performance can be restored.