Abstract: A hermetic portion on the side of a main body portion of a gas insulated switchgear and a hermetic portion of a bushing tank which has polymer bushings connected to the main body portion are configured separately, and electrical connection between the main body portion side and the bushing tank is carried out in an open portion. A mid tank is provided in the rear of the main body portion in which a switching apparatus is housed, and conductor portions which are horizontally led out from the main body portion are led into the mid tank, bent upward, and connected to bushings on the top of the mid tank. Cables are extended downward from the bottom of the bushing tank disposed above the mid tank via a support panel, and in the open portion, the cables are connected to the bushings.

Abstract: A bushing tank having power receiving lead-in bushings of three phases to which conductor portions extended rearward of a main body portion in which a switching device is housed are connected is included, and the power receiving lead-in bushings of the three phases are disposed at an upper surface portion of the bushing tank at equal intervals in a circumferential direction such that end portions thereof are inclined outward so as to be separated from each other, and one of the power receiving lead-in bushings of the three phases is disposed along a front-rear direction of the main body portion. Owing to this configuration, it is possible not only to ensure insulation distances between the end portions of the power receiving lead-in bushings but also to ensure insulation distances between lead-in wires regardless of a power receiving lead-in direction.

Abstract: A bushing tank having power receiving lead-in bushings of three phases to which conductor portions extended rearward of a main body portion in which a switching device is housed are connected is included, and the power receiving lead-in bushings of the three phases are disposed at an upper surface portion of the bushing tank at equal intervals in a circumferential direction such that end portions thereof are inclined outward so as to be separated from each other, and one of the power receiving lead-in bushings of the three phases is disposed along a front-rear direction of the main body portion. Owing to this configuration, it is possible not only to ensure insulation distances between the end portions of the power receiving lead-in bushings but also to ensure insulation distances between lead-in wires regardless of a power receiving lead-in direction.

Abstract: A hermetic portion on the side of a main body portion of a gas insulated switchgear and a hermetic portion of a bushing tank which has polymer bushings connected to the main body portion are configured separately, and electrical connection between the main body portion side and the bushing tank is carried out in an open portion. A mid tank is provided in the rear of the main body portion in which a switching apparatus is housed, and conductor portions which are horizontally led out from the main body portion are led into the mid tank, bent upward, and connected to bushings on the top of the mid tank. Cables are extended downward from the bottom of the bushing tank disposed above the mid tank via a support panel, and in the open portion, the cables are connected to the bushings.

Abstract: The present invention implements a power generation system in which an improved efficiency of fuel combustion and effective purification of exhaust gas can be attained with the use of radiation energies caused by alpha-decay of a natural radioactive element. Namely, radiation energies and neutrons caused by alpha-decay of the natural radioactive element which emits 0.6 becquerels/g or more of alpha rays are irradiated to a supply fuel and intake air, necessary for combustion in a combustion equipment in a power generation system using a fossil fuel, to transform oxygen contained in the intake air into active oxygen which is to be used in a fuel activator (5) and air activator (2) to implement a complete combustion of the mixture of the intake air and supply fuel. Also, a neutron irradiator (3) is provided to irradiate neutrons also caused by the alpha-decay. A water activator (9) with an aeration unit is provided to activate water supplied to a steam generator.

Abstract: A method for cleaning exhaust gas for internal combustion engines or combustion equipment is provided, which comprises the steps of: irradiating air, which is introduced through the air inlet of the engine or equipment, with .alpha.-rays by alpha-decay thereof, to thereby transform diatomic oxygen in the air into a powerful oxidizing active oxygen while transforming, by fission, a part of nitrogen in the air into a monatomic oxygen and monatomic hydrogen, and supplying the combustion equipment or internal combustion engine with the air containing the active oxygen, monatomic oxygen and hydrogen to reduce toxic components from the exhaust gas. An exhaust gas cleaning apparatus for internal combustion engines or other combustion equipment is also provided, which comprises a natural radioactive element which emits 0.001 to 0.6 becquerels of .alpha.-rays by alpha-decay thereof.