Abstract: A monitoring method that can detect a sign of disconnection of a heat generation source is provided. Further, a highly reliable semiconductor device is provided. The monitoring method uses a first control device that samples outputs of a plurality of thermometers at a first frequency (100 Hz sampling in S10) and controls a plurality of heat generation sources based on temperature information obtained by sampling, and a second control device that forms information based on temperature information obtained by sampling at the first frequency (100 Hz sampling in S20) and pieces of heat-generation-source information obtained by sampling of outputs of the respective heat-generation sources at the first frequency (100 Hz sampling in S20). Based on the temperature information obtained by sampling at the first frequency (100 Hz sampling in S20) and the pieces of heat-generation-source information obtained by sampling at the first frequency (100 Hz sampling in S20), states of the heat generation sources are monitored.

Abstract: A monitoring method that can detect a sign of disconnection of a heat generation source is provided. Further, a highly reliable semiconductor device is provided. The monitoring method uses a first control device that samples outputs of a plurality of thermometers at a first frequency (100 Hz sampling in S10) and controls a plurality of heat generation sources based on temperature information obtained by sampling, and a second control device that forms information based on temperature information obtained by sampling at the first frequency (100 Hz sampling in S20) and pieces of heat-generation-source information obtained by sampling of outputs of the respective heat-generation sources at the first frequency (100 Hz sampling in S20). Based on the temperature information obtained by sampling at the first frequency (100 Hz sampling in S20) and the pieces of heat-generation-source information obtained by sampling at the first frequency (100 Hz sampling in S20), states of the heat generation sources are monitored.

Abstract: The present invention is provided to satisfy insulation and conductivity performance requirements, to reduce the size of a gas insulated bus, and also to make conditioning for a particle more reliable. In a gas insulated bus having a conductor supported in a cylindrical metal container via an insulator, insulating gas being contained in the metal container, the metal container has an expanded diameter part formed over a given range in an area of the metal container in which the insulator is positioned and a reduced diameter part formed over the entire area of the metal container except for the expanded diameter part. Thus, when the temperature of the insulator increases during conduction, heat from the insulator is transferred to the metal container via a large space in the expanded diameter part and released to the air through a large outer surface of the expanded diameter part of the metal container.

Abstract: The present invention is provided to satisfy insulation and conductivity performance requirements, to reduce the size of a gas insulated bus, and also to make conditioning for a particle more reliable. In a gas insulated bus having a conductor supported in a cylindrical metal container via an insulator, insulating gas being contained in the metal container, the metal container has an expanded diameter part formed over a given range in an area of the metal container in which the insulator is positioned and a reduced diameter part formed over the entire area of the metal container except for the expanded diameter part. Thus, when the temperature of the insulator increases during conduction, heat from the insulator is transferred to the metal container via a large space in the expanded diameter part and released to the air through a large outer surface of the expanded diameter part of the metal container.

Abstract: Flanges 1A, 2A of metal containers 1, 2 are connected by a plurality of stud bolts 4 through an insulating spacer 3. An antenna body 10 having a planar antenna 11 and an insulating cover 12 is mounted at least on the outer peripheral surface of the insulating spacer 3. In the antenna body 10, an L-shaped support plate 13 is secured on the upper surface of the antenna body 10. And, the support plate 13 is fixed to a mounting plate 15 and a connecting means 16. Or the support plate 13 is fixed directly to the stud bolts 4.

Abstract: An insulating spacer 10 includes a molded insulator 11 having a central conductor 12. The molded insulator 11 part is disposed between the flanges 1A, 2A of metal containers 1, 2 and is coupled by through bolts 5. The peripheral dimension of the molded insulator 11 is smaller than the flanges 1A, 2A, and the insulating spacer 10 is provided with a thin section 11A, one lateral side of which is formed into a thin ring shape. A ring-shaped metal fitting 14 having a cross-sectional L-shape is fitted onto the thin section 11A of the molded insulator 11, the ring-shaped metal fitting 14 defining the dimensions of the space between the flanges 1A, 2A and forming a current path between the metal containers 1, 2. The ring-shaped metal fitting 14 is affixed to the thin section 11A of the molded insulator 11 by multiple tightening bolts 15.

Abstract: Disclosed is a gas-insulated switchgear device, in which a space for dismantlement and inspection work which facilitates the dismantlement and inspection work of circuit breakers at the time of the occurrence of accidents of the circuit breakers are provided and an installation area for the gas-insulated switchgear device can be reduced. The gas-insulated switchgear device includes a pair of spaced apart main bus lines, three circuit breakers connected between the main bus lines, a common space for dismantlement and inspection work provided between two of the three circuit breakers, and branch bus lines provided above the common dismantlement and inspection work space using the common dismantlement and inspection work space and disposed in such a manner that insulatedly leading-out directions of the branch bus lines cross in order to balance voltage.

Abstract: In the measurement of partial discharge, a voltage detected by an antenna is input to a spectrum analyzer and a phase difference between an operating voltage and a power supply of the spectrum analyzer is obtained by phase domain analysis using the spectrum analyzer. Based on the phase difference and the voltage phase shift associated with the input impedance of a signal converter circuit, the time axis displayed on the screen of the spectrum analyzer is compensated. After the compensation has been carried out, the voltage detected by the antenna is input into the spectrum analyzer and the partial discharge pattern which synchronizes with the operating voltage is measured by phase domain analysis using the spectrum analyzer.

Abstract: Disclosed is a gas-insulated switchgear device, in which a space for dismantlement and inspection work which facilitates the dismantlement and inspection work of circuit breakers at the time of the occurrence of accidents of the circuit breakers are provided and an installation area for the gas-insulated switchgear device can be reduced. The gas-insulated switchgear device includes a pair of spaced apart main bus lines, three circuit breakers connected between the main bus lines, a common space for dismantlement and inspection work provided between two of the three circuit breakers, and branch bus lines provided above the common dismantlement and inspection work space using the common dismantlement and inspection work space and disposed in such a manner that insulatedly leading-out directions of the branch bus lines cross in order to balance voltage.

Abstract: In the measurement of partial discharge, a voltage detected by the antenna is input into a spectrum analyzer and a phase difference between an operating voltage and a power supply of the spectrum analyzer is obtained by phase domain analysis using the spectrum analyzer. Based on the phase difference and the voltage phase shift associated with input impedance of the signal converter circuit, the time axis displayed on the screen of the spectrum analyzer is compensated. After the compensation has been carried out, the voltage detected by the antenna is input into the spectrum analyzer, the partial discharge pattern which synchronizes with the operating voltage is measured by phase domain analysis using the spectrum analyzer.

Abstract: In the measurement of partial discharge, a voltage detected by an antenna is input to a spectrum analyzer and a phase difference between an operating voltage and a power supply of the spectrum analyzer is obtained by phase domain analysis using the spectrum analyzer. Based on the phase difference and the voltage phase shift associated with the input impedance of a signal converter circuit, the time axis displayed on the screen of the spectrum analyzer is compensated. After the compensation has been carried out, the voltage detected by the antenna is input into the spectrum analyzer and the partial discharge pattern which synchronizes with the operating voltage is measured by phase domain analysis using the spectrum analyzer.

Abstract: A thin film detection electrode is formed on an insulating substrate. The resulting detection electrodes are light-weight, and have a very high dimensional accuracy so that the number of the parts supporting the detection electrodes is small and the size of the detection electrodes becomes very small. By an increase in the dimensional accuracy of the detection electrodes, reduction in insulating properties due to a water content in a insulating gas can be measured in addition to measurement of electromagnetic wave.

Abstract: Prior to the measurement of partial discharge, a voltage detected by the antenna is inputted into a spectrum analyzer, a phase difference between an operating voltage and a power supply of the spectrum analyzer is obtained by phase domain analysis using the spectrum analyzer. Based on the phase difference and the voltage phase shift associated with input impedance of the signal converter circuit, the time axis displayed on the screen of the spectrum analyzer is compensated. After the compensation has been carried out, the voltage detected by the antenna is inputted into the spectrum analyzer, the partial discharge pattern which synchronizes with the operating voltage is measured by phase domain analysis using the spectrum analyzer.

Abstract: In order to shorten the length of connection buses and reduce a cost, in the present invention, a plurality of T-branched circuit breaker units 12 are arranged in a direction perpendicular to the T-branch direction, and the plurality of circuit breaker units 12 are connected by first connection bus units 14 and second connection bus units 15 in series alternately in a rectangular wave shape on a horizontal plane of approximately the same height as the T-branch portions of the circuit breaker units 12. Thereby, first connection buses 5 and second connection buses 6 are stretched around on the horizontal plane of the same height as the T-branch portions of the circuit breaker units 12, but not stretched around in an up and down direction. Therefore, the length of the connection buses can be reduced, and the cost also can be reduced.

Abstract: A gas insulated switchgear includes a plurality of T-branched circuit breaker units arranged in a direction perpendicular to the T-branch direction, and connected by first connection bus units and second connection bus units in series alternately in a rectangular wave shape on a horizontal plane of approximately the same height as the T-branch portions of the circuit breaker units. First connection buses and second connection buses are arranged around on the horizontal plane of the same height as the T-branch portions of the circuit breaker units, but are not arranged in an up and down direction.