Mitsubishi Denki Kabushiki Kaisha

Toshiaki Yoshizumi

Mikio Hidaka

Yoshiki Hirano

Tsutomu Sugiyama

Masaki Kuzumoto

Hajime Nakatani

Koji Ohta

Yasuhiro Tanimura

Nobuya Nakajima

Hideo Ichimura

Takashi Yonezawa

Ichiro Yamasaki

Mamoru Hosomi

Akiyoshi Yoshioka

Akiyoshi Onuma

Isao Nishio

A volatile organic compound treatment apparatus including an adsorber coming into contact with a gas to be treated and adsorbing volatile organic compounds; a plurality of pairs of electrodes, divided into a plurality of groups, which generate electric discharge so that a part of the adsorber is exposed to the electric discharge; and an electric discharge control mechanism for controlling whether or not the electric discharge is generated in what pair of the electrodes by applying a voltage to every group of the pair of electrodes such that different parts of the adsorber are sequentially exposed to the electric discharge.

Volatile organic compound treatment apparatus

In a double-break type circuit breaker having resistor contacts which are to be connected in parallel with main contacts in not only closing operation but also breaking operation, the resistor contacts are opened by a force due to loading of elastic members in the breaking operation and the elastic members are loaded for storing the driving force In the closing operation.

Circuit breaker and driving mechanism thereof

In a stationary contact unit of a gas circuit breaker, an arc-quenching cylinder for passing an arc-quenching insulation gas is formed in a substantially semicircular shape, and the stationary contact unit is supported by an insulation frame which is disposed beneath the dent part of the semicircular portion of the arc-quenching cylinder. The insulation frame is prevented from the degradation of dielectric strength between the stationary contact unit and a grounded tank, and the size of the gas circuit breaker is decreased.

Gas circuit breaker

In a closing operation of a circuit breaker with resistor contact, a resister contact is closed prior to closing of a main contact by the same first hydraulic operation system. In opening operation, the resistor contact is driven by a second hydraulic operation system used to close the main contact after operating the main contact by the first hydraulic operation system. Opening timing of the resistor contact is controlled by a mechanical interlock mechanism or hydraulic control circuit.

Circuit breaker

A double-break type circuit breaker includes two resistor contacts which are to be connected in parallel with respectively two main contacts when the main contacts are closed. An engagement mechanism is provided for linking the main contacts operated by a first hydraulic operation apparatus and the resistor contacts operated by a second hydraulic operation apparatus.

A hydraulic operating apparatus for a circuit interrupter comprises a conversion unit for converting input information from the exterior concerning a speed control pattern into an electrical signal for driving a linear or servo motor according to the closing and interrupting commands, the motor drive signal provided from the converting means being transmitted to the motor such that the displacement of the motor causes the hydraulic control valve apparatus to be operated to switch the fluid passages to selectively drive the hydraulic cylinder in different directions, and that the position during the switching of the hydraulic control valve driven by the motor is made different from the final stop position at its interruption or closed state to provide a throttle effect of a throttle in the hydraulic control valve thereby controlling the speed of the hydraulic cylinder. The hydraulic operating apparatus may comprise a conversion unit for converting contact closing and opening commands into an electrical signal for driving a linear or servo motor.

Hydraulic control valve apparatus

This invention relates to an enclosed D.C. converting station having enclosed 3-arm integral type bulbs constructed integrally with bulbs for three arms of the same polarity side of bulb arms for forming a 3-phase bridge circuit.

Enclosed D.C. converting station

In an interrupter, an insulated nozzle is disposed in the vicinity between a pair of contact elements and is adapted to extinguish an arc occurring between the contact elements by blowing an insulating gas thereto. This insulated nozzle is formed from a fluoroplastic and boron nitride mixed thereinto, the mixed proportion of boron nitride being within a range of weight percentages of 0.3 to 1.0.

Insulated nozzle for use in an interrupter

A hydraulic operating apparatus in which a differential piston is used as a drive unit, and in which the differential piston is driven by applying a high pressure fluid on a large piston face side through a hydraulic pressure control device for controlling the hydraulic pressure, and a high pressure fluid always being applied on the small piston face side. The hydraulic operating apparatus is constructed such that a high pressure fluid is applied concurrently on both piston faces when the differential piston stops at its receded position, and a thrust generated due to the difference between the forces applied on the both piston faces is held in check by a holding device acting on the differential piston or its extension. The differential piston is moved forward upon the removal of the holding force of the holding device, and the piston is moved backward upon the removal of the high pressure fluid on the large piston face side.

Hydraulic operating apparatus for electric circuit breaker

High-voltage thyristor conversion/inversion apparatus

A high-voltage thristor converter and control therefor includes a plurality of thyristor modules and a transducer for feeding a control signal to each of the thyristor modules in response to an external operation command. The transducer produces an electrical control signal which is directed to a laser beam irradiator which converts the control signal into a laser beam signal. The laser beam signal is directed to a light sensitive element in the thyristor module for converting the laser beam signal into an electric control signal to trigger a thyristor element in the module.

High-voltage thyristor converter and laser with mirror control therefor

A spring-operated mechanism for actuating a switch gear, etc. comprises a cam member secured to a crankshaft and adapted to be moved thereby. Cam grooves are formed in the cam member such that the distance from the center of the crankshaft is smallest at the middle portion of the groove and progressively increases towards the extremities of the groove. A rod is provided with a pin at one end adapted to be rolled at each end within the cam grooves, and at the other end the rod is provided with a spring support. A stationary member is provided with guide elements to cause the rod to move linearly, and a spring is disposed between the stationary member and the spring support, whereby the spring is adapted to store compressive energy when the crankshaft is rotated through a predetermined angle by a driving source, and, through a further revolution of the crankshaft, the spring releases the stored energy to accelerate the revolution of the crankshaft.

Spring-operated mechanism

A disconnecting switch including a hollow cylindrical shield of an electrically conducting material including a circular opening, a spring loaded arcing contact member, a main stationary contact member disposed within the shield to be slightly spaced from the plane of the opening and surround the arcing contact member, and a toroidal electrode disposed in the opening and having a curved surface externally protruding beyond the plane of the opening. The arcing and main contact members are connected to the shield while the electrode is connected to the shield through a resistor. At the open position the arcing contact member slightly protrudes beyond the plane of the opening. At the closed position a movable contact member engages both the main contact member and the arcing contact member at its retroggessing position.

Resistor-type disconnecting switch for circuit breaker

A circuit including arcing contacts is connected in parallel with main contacts of a disconnector to facilitate interruption of a loop current caused through the disconnector when switching main bus bars in a power station. A switching surge suppression resistor is adapted to be inserted in and removed from the circuit of the arcing contacts. Plural pairs of arcing contacts are provided in the circuit of arcing contacts.

Gas insulated disconnector

The invention relates to a mechanism for adjusting the speed of movement of an arcing contact for a switching apparatus for preventing main contacts of the apparatus from being damaged by arcing. A support that supports an arcing contact and a cylinder accommodating a piston secured to the support are formed respectively with nozzle grooves and nozzle holes. The nozzle grooves and nozzle holes serve to communicate the inside and outside of the cylinder and adjust the speed of movement of the arcing contact according to the movement of the arcing contact. The way in which the speed of movement of the arcing contact is adjusted can be varied by varying the shape and length of the grooves formed in the support.

Growing community of inventors

Amagasaki, Japan

Toshiaki Yoshizumi