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JPH08103021A |
PURPOSE: To provide a system for safely and automatically managing the power source to supply power to indoor or the entire building which can cope with the leakage, etc., of combustible gas. CONSTITUTION: The concentration of the city g...
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JPH08101246A |
PURPOSE: To provide a device for rapidly detecting the abnormal part (failure) of an underground transmission line for example the contact failure of a bond wire. CONSTITUTION: An ultraviolet detection pipe 1 is provided at a part to be ...
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JPH0830697B2 |
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JPH0883909A |
PURPOSE: To obtain a semiconductor integrated circuit preventing breakage of a voltage driving type power control element of an external circuit without letting a through current flow to it even if an earthing terminal turns open. CONSTI...
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JPH0879923A |
PURPOSE: To obtain a ground fault locator for GIS in which the ground fault occurring in the tank of gas circuit breaker can be discriminated from normal current interruption. CONSTITUTION: A ground fault is located by measuring the gas ...
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JPH0879965A |
PURPOSE: To accurately locate an accident point when an accident occurs at the time of shifting from grounding to short-circuiting in a transmission line by performing a grounding detection mode with a high detection sensitivity when a g...
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JPH0879926A |
PURPOSE: To obtain an optical detector which can endure the gas tightness and the high pressure of gas insulated switchgear sufficiently and a gas insulated switchgear in which the fault point can be searched quickly with no error throug...
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JPH0879966A |
PURPOSE: To prevent causes of pressure increase from being recognized by mistake and to accurately locate an accident point by comparing the line voltage of a bus with an arc voltage when a short-circuiting accident occurs in a gas insul...
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JPH0879968A |
PURPOSE: To easily replace a protection board when a failure occurs by mounting a fuse and ZNR on one board as a protection board and connecting the protection board between a power supply and an electrical equipment so that it can be re...
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JPH0827303B2 |
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JPH089648Y2 |
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JPH0868823A |
PURPOSE: To provide an abnormality detector for a gas insulated electrical machinery and apparatus, wherein the noises caused by thunderbolt surging and the like do not occur during the transmission of the pressure signal and the tempera...
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JPH0862082A |
PURPOSE: To provide an inspection device for more positively and accurately detecting the failure in a pressure sensor. CONSTITUTION: The gas pressure of a gas insulation electric equipment 1 is measured by a pressure sensor 4 and temper...
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JPH0865887A |
PURPOSE: To improve reliability in operation and reduce an operation time, by detecting a short-circuit current by a photo-magnetic sensor and putting a reactor in a make state directly in a circuit according to a detection signal. CONST...
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JPH088464Y2 |
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JPH086358Y2 |
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JPH0850160A |
PURPOSE: To provide a standardizing method of locating an accident point for gas insulation switchgear in which a rise of gas pressure caused by earth is discriminated from a pressure rise caused by the interruption of a load current so ...
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JPH0847166A |
PURPOSE: To detect failure of heating source control relay without increase in the number of parts by comparing a temperature detection signal during OFF control of the heating source control relay with a preset irregular temperature sig...
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JPH0837721A |
PURPOSE: To secure safety of 24-hour operating equipment by automatically interrupting the power supply to the equipment when an abnormal high temperature or a drop in resilient spring pressure is detected at the part a power supply plug...
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JPH0832361A |
PURPOSE: To prevent overheat of a power transistor(TR) without the use of a large sized heat sink and to prevent flowing of a large current that might destroy a load or the circuit. CONSTITUTION: This amplifier circuit is constituted of ...
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JPH088184B2 |
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JPH083146Y2 |
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JPH083147Y2 |
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JPH088181B2 |
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JPH083145Y2 |
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JPH0823628A |
PURPOSE: To provide an accident point locating device for a gas insulated switch gear which is improved in reliability by eliminating a blind spot for locating a fault spot. CONSTITUTION: One-phase outputs of potential transformers LPT1 ...
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JPH0819171A |
PURPOSE: To easily test a gas detection in a distribution board to which a gas piece is applied by a method wherein a gas-piece mounting stand to which the gas piece is attached is heated. CONSTITUTION: A terminal screw 22 which is used ...
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JPH083509B2 |
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JPH081773B2 |
A gas insulated switchgear including a hermetic vessel 21 for containing therein an electrically insulating gas comprises a switching apparatus which is to be disposed at an end of a region to be protected and including at least two circ...
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JPH07123331B2 |
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JPH07123330B2 |
PURPOSE:To automatically notify the occurrence and occurring time of abnormal overheat by periodically detecting the current, temperature of a conductive part and the outer air temperature thereby predicting the temperature variation amo...
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JPH0756580Y2 |
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JPH07123332B2 |
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JPH07319574A |
PURPOSE: To evade a temperature abnormal state satisfactorily by detecting the abnormality of temperature at an arbitrary place in a device rack and increasing/decreasing a clock frequency in each functional board. CONSTITUTION: A temper...
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JPH07312824A |
PURPOSE: To provide a safety device having a device for monitoring the accumulation of a gas in a limited space and for generating an audio signal or a visual signal, when the level of the accumulated gas exceeds a predetermined value. C...
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JPH07109428B2 |
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JPH07100419B2 |
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JPH07280878A |
PURPOSE: To provide a monitor-controlling device of high reliability and simple structure, by which a pressure gas insulating-type shielded electric wire having plural zones, is monitored, and the zone having the problem is detected. CON...
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JPH0746011Y2 |
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JPH0746010Y2 |
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JPH0797885B2 |
PURPOSE:To easily detect a malfunctioned position by connecting a plurality of gas sensors responding to gas except insulation gas in a metal vessel in which the gas and electric device body are sealed, and detecting the response of the ...
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JPH07264770A |
PURPOSE: To provide complete protection from the heat generation of a power supply device by detecting temperature rising in the heated part of the power supply device and the atmospheric temperature in the power supply device for the op...
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JPH07261834A |
PURPOSE: To provide the plant equipment monitor device which can detect abnormality of the equipment by grasping minute variation of a detection signal. CONSTITUTION: The plant equipment monitor device which detects the abnormality of th...
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JPH07256148A |
PURPOSE: To provide a highly reliable overrotation preventive controller of rotors by a hardware device capable of preventing the overrotation of rotors according to the information indicating the max. permissible number of revolutions r...
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JPH0789710B2 |
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JPH0789705B2 |
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JPH0787670B2 |
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JPH07245871A |
PURPOSE: To prevent undue temperature rise of a high voltage transformer for microwave oven by sensing the temperature of the high voltage transformer directly and regulating power supply thereto. CONSTITUTION: A thermostat TH is bonded ...
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JPH07245869A |
PURPOSE: To detect the deterioration of insulation without using GPT and further specify the position of insulation deterioration for every three-phase cable (feeder) and for every phase. CONSTITUTION: In electric equipment in which a pl...
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JPH0785278B2 |
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