Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Mitsubushi Denki Kabushiki Kaisha

Naoki Ochi

Ikuro Suga

Kenro Mitsuda

Sadayuki Matsumoto

Makoto Seto

Yoshiyuki Takuma

Hikozo Morisita

Shinzou Ogura

Chiharu Umeno

Kazuhiro Nakazaki

Provided is an electric double layer capacitor including a large capacity single cell having a large electrostatic capacity and a small capacity single cell are connected to the same exterior case in parallel, and a thickness of a separator of the large capacity single cell is made thicker than a thickness of a separator of the small capacity single cell. With this structure, a supply amount of an electrolyte solution to the large capacity single cell is markedly increased compared with the small capacity single cell, thereby being capable of preventing degradation of the large capacity single cells and the small capacity single cells and providing the electric double layer capacitor having an excellent cycle life and having a large power storage amount while keeping characteristics capable of instantaneously allowing large current to flow.

Electric double layer capacitor

A current transformer includes transformer units combined into a bundle, each of the transformer units including an annular iron core surrounding a bus conductor and a secondary winding wound around the iron core for measuring an electric current flowing through the bus conductor, and a shield winding wound around the bundle of the transformer units. The secondary winding may be provided with an air gap in which no secondary winding is present, located at a portion of the current transformer in a direction of a resultant vector, perpendicular to a line connecting bus conductors neighboring the bus conductor to be measured and passing through the bus conductor to be measured. A second air gap may be provided at the position opposite the air gap of the transformer, relative to the bus conductor to be measured, and the shield winding may be divided into two parts at the air gap and opposite the air gap relative to the bus conductor to be measured.

Current transformer

At both ends parts of a specified section of a high tension line and close to it, a first Faraday device and a second Faraday device are disposed, and an output end of the first Faraday device is connected to the input end of the second Faraday device through a polarization plane retaining type optical fiber. A light having a linear-polarized polarization plane is inputted from a polarizer to the input end of the first Faraday device. The light output from the second Faraday device is led through an analyzer to a photoelectric device, whose output is processed by an electric circuit consisting of only one band-pass filter, only one DC filter, only one divider, and a judgment circuit.

Apparatus for detecting failure in power system

An optical instrument transformer can measure both current and voltage of the primary conductor. Measurement of current is made through modulation effect of a light signal by the optical magnetic-field sensor, and measurement of voltage is made through modulation effect of a light signal by the optical electric-field sensor, by measuring the voltage between a conductor member and an upper flange the of the a bushing, which has a value divided in a dividing ratio determined by the capacitance between the conductor member (4a) and the upper flange and the capacitance between the upper flange and ground.

Optical instrument transformer

An optical current transformer, which uses a Faraday cell for detecting the intensity of a magnetic flux induced in a circular iron core, has plural windings having the same number of turns provided on the core in a manner that overall width of the windings are evenly wound along the whole part of the circular iron core, and terminal of the windings having the same polarities are commonly connected by cables.

Optical current transformer

An optical transformer comprises at least two potential dividing capacitors connected in series to each other are connected between a high-voltage conductor and an intermediate electrode or between the intermediate electrode and the ground, and optical voltage sensors connected in parallel to the respective potential dividing capacitors and capable of modulating light in accordance with voltage. In another form, the optical transformer has a single potential dividing capacitor connected between a high-voltage conductor and an intermediate electrode or between the intermediate electrode and the ground, and at least two circuits connected in parallel with the potential dividing capacitor, each circuit including a series the connection of an optical voltage sensor for modulating light in accordance with the voltage and a resistor or an impedance.

Growing community of inventors

Amagasaki, Japan

Naoki Ochi