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JP2914439B2 |
An LC resonant circuit for a resonant converter includes a resonant capacitor and an inductor coupled to a fixed frequency AC supply. A controlled inductor in parallel with the resonant capacitor is controlled by a DC current to vary its...
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JPH11162754A |
To provide a transformer controlling and monitoring apparatus, by which total costs necessary for control and monitoring of anomalies of a loaded tap changer and a transformer can be reduced. One side of a tap driving circuit 2 is connec...
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JPH11135337A |
To provide an under-load tap changer wherein sticking and deposition of carbon and metal powder is reduced to a minimum. A shield part 3 and a drive mechanism 6 for driving the shield part 3 are provided at a lower part and an upper part...
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JP2889700B2 |
An apparatus for providing an electrically controllable inductor uses a first and a second magnetic core (20, 24) spaced apart from one another. A DC bias coil (22) is wound on the first magnetic core (20). An inductor coil (26) is wound...
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JPH11111540A |
To restrain unnecessary tap change of an LRT of higher order system, by outputting a step-up or a step-down command to the LRT by operating an AVR in a higher order system electric station only when voltage regulation is not enabled with...
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JP2884670B2 |
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JPH11102826A |
To provide a reactor having simple configuration and enabling easy wiring. Wirings d, e, and f are connected in parallel circuit relation with wirings a, b, and c which connects a three phase alternating power source with an induction mo...
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JPH11102827A |
To widen the control range of output voltage in high reliability using less numbers of parts, wherein the required total control gain is specified by the formulas of residual magnetic flux density, total control operational magnetic flux...
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JPH1197258A |
To improve the reliability and maintainability of the motor-driven mechanism by placing terminal board in the mechanism box top. A terminal board 9 is placed in the top of the motor-drive mechanism to improve the workability because the ...
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JPH1198690A |
To supply a voltage of good quality to the load side by performing voltage compensation only for other phases than two phases sustaining a specified phase voltage when one or two phase voltage fluctuates steadily on a distribution line t...
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JPH1189103A |
To provide a non-contact type charger which can control charging current with a secondary circuit, without the use of a resistor for limiting current which presents the problem of heat generation or size increase. This non-contact type c...
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JP2871025B2 |
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JPH1169615A |
To miniaturize a neutral-point grounding apparatus in which a reactor and a resistor are installed side by side. A neutral-point grounding apparatus is constituted in such a way that a liquid resistor 5 or a ceramic resistor, which is co...
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JPH1169614A |
To miniaturize a neutral-point grounding apparatus in which a reactor and a resistor are installed side by side. A neutral-point grounding apparatus is constituted in such a way that a liquid resistance material 5, in which an electromag...
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JPH1154342A |
To provide an on-load tap changer, the changing time of which can be corrected to an appropriate value by making the stored energy of a compression spring adjustable. Bolts 23 and nuts 24 are respectively provided at the front end sectio...
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JP2859848B2 |
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JP2590619Y2 |
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JP2857623B1 |
[wrap up] [Task] In the energy storage mechanism used for the switching switch of the tap changer under load, the start time at which the swingable slave lever directly connected to the output shaft tilts from one direction to the other ...
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JPH1146444A |
To effectively correct the voltage unbalance caused by the unbalance load of specified one or two phases of a three-phase AC distribution line or the unbalance of the system impedance into a given voltage unbalance rate of the wiring lin...
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JPH118138A |
To obtain a variable phase-shifting transformer using a phase-shifting transformer as its fixed leg and using a coaxial transformer as its movable leg, by a method wherein a double radiation winding wire formed by connecting two radiatio...
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JPH118137A |
To obtain a small-sized, lightweight and low-cost non-contact contactor and a transformer tap change-over system voltage adjusting device, by a method wherein the gates of thyristors are made to drive on the basis of output signals from ...
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JPH118134A |
To prevent the generation of an electric shock accident. In a transformer 10 for receiving equipment, a low-voltage coil 16 is arranged on the outside of a high-voltage coil 14 wound on a core 12 into the form of a concentric circle sepa...
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JP2844515B2 |
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JP2839089B2 |
To provide a voltage controller, wherein load equipment is not adversely affected or the user does not become distrustful, even if there is a large difference between the output voltage of a transformer and a reference voltage. A voltage...
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JP2829508B2 |
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JPH10304566A |
To provide a power facility which is capable of controlling the voltages of the first and second secondary windings of a three-winding transformer, on the occasion of adopting this three-winding transformer of different transformer radio...
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JPH10303042A |
To control voltage at high speed by changing the current value of a control winding wire wound to a part of a first magnetic circuit, controlling the shift of magnetic flux on the first magnetic circuit and a second magnetic circuit, to ...
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JP2824035B2 |
PURPOSE: To prevent the accident of a tap switcher on loading in advance by allowing a monitoring means to calculate the amount of consumption of the contactor of a changeover switch according to a specific condition expression. CONSTITU...
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JP2820722B2 |
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JP2817647B2 |
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JP2818090B2 |
PURPOSE: To improve dielectric strength and to constitute a coil for an electro magnetic inductive machine at a low cost by shortening working hours during winding operation improved work efficiency and by making the top end part insulat...
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JPH10284332A |
To provide an operation torque diagnostic device for an on-load tap changer by which accuracy of measured value is improved and estimation and judgment can be made according to a torque value during operation and record of position in wh...
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JPH10285836A |
To improve transmission efficiency on a receiving device and meet a fluctuation in load impedance on a receiving device, by switching the connection of a leader line with a diode bridge so that conductive efficiency may be optimum in acc...
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JPH10275730A |
To provide an on-load tap changer which is housed inside such transformer vessel as a small pole transformer. To first and second frames 11 and 12, fixed contact points 1-10 are fixed, respectively. A movable contact-point conductor 15 i...
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JPH10275731A |
To provide an oil-immersed electrical equipment wherein, with less number of parts, switching operation is done with a simple structure. In an insulating oil 8 inside a transformer vessel 1, a transformer main body 3 and an on-road tap c...
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JPH10270266A |
To suppress uneven consumption of a contactor of a switching open/ close device by changing a resistance value of a limited current resistance of an on-load tap switcher. Sensors 2, 3 and 4 detecting temperature change due to the fluctua...
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JPH10241966A |
To shorten the time of restoration and to detect abnormality of a bushing at an earlier time in the case where an on-load voltage regulator side system breaks down and a main transformer is switched to a single operation. A main transfor...
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JPH10241956A |
To obtain a transformer winding which is improved in dielectric strength against impulse voltages. A high-voltage winding 50 in a transformer windings is constituted of disc windings 51 and 52 formed by continuously winding coil conducto...
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JPH10241952A |
To prevent insulating oil from flowing out owing to a siphone phenomenon communicating a manifold with an oil transportation pipe through a small- diameter conduit and a valve between the oil flow relay of the manifold and a tap change-o...
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JPH10229021A |
To take the make-and-break contact part of a check target out of a casing by arranging a second changer which selectively connects one output edge of both movable contactors of a tap selector to a device output edge, without using two di...
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JPH10223457A |
To provide a generator which is free from vibration and noise. This static magnet type of generator comprises a permanent magnet 1, a first core 2 which forms a closed magnetic path, a coupling the different poles of the permanent magnet...
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JP2785130B2 |
A contact arrangement for tap changers of tap transformers, in which the contact piece is seated with a shank (1) in a hole of a cylindrical wall (2) consisting of wound dielectric material and has a connecting surface on the one side an...
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JPH10207557A |
To securely apply a specific voltage to a load even in the case of wide-range voltage variation by detecting an input or output voltage and performing ON/OFF control over a switch according to the detection result, and holding the output...
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JPH10208954A |
To suppress uneven abrasions of the contacts of a changeover switch, by making alterable the resistance values of the current limiter resistors of an on-load tap change-over switch. A current transformer is 2 provided to sense the load c...
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JPH10208953A |
To prevent the tap shifting between LRTs by inhibiting the output of independent control signals to the LRTs when the LRTs are operated in parallel with each other by means of a power system. An arithmetic device 13 judges the state of a...
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JPH10187256A |
To linearly reduce the load voltage of large capacity by means of a mutual induction reactor that has the considerably small capacity compared with the load capacity by applying selectively the output voltage of an autotransformer to the...
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JPH10177355A |
To make it possible to install even a thin display which has a large screen at general home by equipping the mechanism with a hold part provided on the back side of the thin display and a fixture which fixes the hold part to fittings. Th...
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JPH10172840A |
To realize a small size and long-life reactor and substantially eliminate the maintenance work by providing a semiconductor active element connected in parallel to secondary winding of a reactor and control circuit for changing the imped...
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JPH10163042A |
To enable cost-reduction and miniaturization of a switching power circuit. A cross core driving transformer T1 is provided with a magnet MG to generate a steady magnetic flux c2 in the opposite direction to a magnetic flux c1 generated b...
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JPH10163043A |
To provide a power unit at a low cost wherein in the case of designing in response to a different supply voltage with the same load, for example, in the case of designing a DC 12V system and a DC 24V system, there is no need to greatly c...
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