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JP2004071651 |
To provide an on-load tap changer which can be simplified and reduced in size without impairing the necessary functions.The on-load tap changer 1 is provided with a plurality of vacuum valve opening/closing mechanisms 1. Each of the mech...
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JP2004064842 |
To provide a current limiting device of smaller size, less weight, and lower cost.A first iron core 2C and a second iron core 2D magnetically saturate when no current flows a coil 3 and when a load current is energized to the coil 3. If ...
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JP2004047612 |
To provide a step-down type DC-DC converter which maintains high efficiency even when a load current is small, and to provide a variable smoothing inductor for use in the same.The reducing type DC-DC converter is constituted by employing...
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JP3518010 |
PURPOSE: To make it possible to precisely adjust the title reactor device and to simplify the short-circuit operation of a coil by a method wherein a motor is used for movement of a bucking cylinder, and this bucking cylinder performs an...
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JP2004039958 |
To provide a vacuum valve on-load tap changer which is intended to miniaturize by making compact a change-over switch and a cam mechanism for driving the change-over switch.A vacuum valve Ma or Mc constituting a change-over switch SW is ...
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JP2004023013 |
To make an accurate maintenance and inspection period informing by predicting the electrical lifetime of a tap changer, and to reduce wasteful consumption of electrical components.In a controller 6, a breaker-state signal (1) from a brea...
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JP2004023026 |
To provide a vacuum valve type on-load tap changer in which the off-operation starting point of a vacuum valve forming a changer switch is prevented from varying.Outside a main cam mechanism for driving a vacuum valve M2 forming a change...
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JP2004015043 |
To realize a magnetic tap transformer having a small leakage impedance which can switch the tap of a power transformer with switching operation of a magnetic circuit.In an induction type voltage regulating transformer in which an opposin...
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JP3509984 |
PURPOSE: To provide the voltage regulation board of the transformer with the load-time tap switch which can regulate a voltage properly and speedily after power source recovery even if the power source of a motor-driven operation mechani...
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JP3507638 |
To provide a high efficiency and low loss thyristor type pulse discharge circuit by reducing a voltage drop of a thyristor when a pulse current starts to flow. An electromagnetic assisting type discharge circuit is structured so that a t...
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JP3502516 |
To detect primary side voltage lowering and a system voltage lowering phenomenon without the arrangement of PT, etc., on the transformer primary side by calculating the primary side voltage of a transformer through the use of a winding i...
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JP2003332145 |
To solve the problem that zero phase current is large and noise to a communication line to generate electromagnetic inductive obstacle and it is afraid that reliability may be damaged to quality of electric power because short circuit im...
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JP3491380 |
PURPOSE: To provide a stationary induction apparatus in which load loss and short-circuit mechanical force in the axial direction are reduced and the manufacturing steps and its cost are also reduced. CONSTITUTION: A low-voltage winding ...
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JP2003309022 |
To provide a roller contactor for a tap selector, which is small in shape and cheap, and a tap selector using the contactor.The roller controller comprises an upper and lower pair of rollers 12 held on a body 10. A collector contact 2 an...
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JP2003299361 |
To solve the problem that since a conventional low-voltage automatic voltage regulator is provided only in a device for a single-phase load, if a demander requiring a three-phase load is located at a remote place, it is necessary to wire...
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JP2003297648 |
To prevent failure expansion by protecting a winding of a transformer when a vacuum valve used for a change-over switch of an on-load tap changer is abnormal, and warning the outside for the abnormality.For the change-over switch of the ...
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JP3480038 |
PURPOSE: To provide a gas insulated stationary induction device that decreases the construction cost of an underground transformer substation drastically by simplifying and miniaturizing the three-phase device. CONSTITUTION: The three un...
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JP2003229315 |
To provide a three-phase variable inductance device, which can be made smaller because no mechanical operation is required, has an excellent response property and high strength against an overcurrent and overvoltage, and is suitable for ...
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JP2003217948 |
To improve the operation rate of a transformer by detecting vacuum leakage of a vacuum switch tube, in a on-load tap changer using the vacuum switch tube in a running state of the transformer.This on-load tap changer comprises a decompos...
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JP3446336 |
PURPOSE: To enable this device to start quick-break operation from the position of maximum flexure of a power-accumulating spring by providing an idle clutch, and pulling off a latching lever through this. CONSTITUTION: In case of changi...
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JP2003188031 |
To provide a on-load tap changer which is compact, has high performance, can prevent a short-circuit accident from occurring by detecting an abnormality fast even in the case that a vacuum valve cannot be isolated and can achieve superio...
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JP2003185690 |
To provide a power transformer whose life diagnostic accuracy can be enhanced by reducing the computational error of a maximum winding temperature to a minimum.In the power transformer, a transformer mainframe having a winding is housed ...
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JP2003168612 |
To provide an electromagnetic apparatus which is less affected by a load current flowing through a three-phase main winding, formed into a three-phase integral structure, can be reduced in higher harmonics without using an insulating fil...
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JP3439692 |
To provide a flux controlled electromagnetic apparatus in which opposite laminated iron cores are in the same laminated direction as a laminated electromagnetic steel plate in a pair of cut-core contacts and which comprises an electromag...
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JP3439620 |
To make on-load a tap switcher smaller and lighter using a vacuum switch. An input axis 20 and an output axis 22 are disposed concentrically, and the input axis 20 of a force-accumulating mechanism drive by accumulating drive power in a ...
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JP3435228 |
PURPOSE: To provide a knockdown transformer which has a large size and can be transported while its tap leads and LTC are connected to each other and fitted to a divided tank. CONSTITUTION: In a knockdown transformer which is disassemble...
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JP2003133147 |
To realize a significant energy-saving effect by changing the procedure but not using any excessive material.Five taps 6 are attached between 6,450 V and 6, 750 V in the service range. Pitch 75 V is raised or lowered by about 1.14% with ...
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JP3424947 |
PURPOSE: To obtain a polarity switch of tap selector for swithcing a tap coil to a constant potential during the switching period of a preliminary selector or switch. CONSTITUTION: This polarity switch is formed of at least one fixed pol...
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JP3416809 |
PURPOSE: To improve the dimension, weight, conversion efficiency, reliability, switching noise, manufacturing cost, etc., of an electricity regulator by providing one winding wound by an arbitrary number of turns on the secondary side an...
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JP3418630 |
PURPOSE: To realize a horizontal installation type resin mold transformer wherein the tap switching operation of coils is easy, by installing tap switching terminals of a coil at a distance within almost one-half of the average height fr...
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JP2003109829 |
To provide a tap change-over unit under load high in reliability of operation in a small-sized and simple constitution.In the tap change-over unit under load comprising a change-over switch for changing over a plurality of taps having a ...
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JP2003100529 |
To provide such an on-load tap changing device that can detect an abnormality therein accompanied by an increase in temperature of insulation oil in a switchgear room and that not accompanied thereby, in the on-load tap changing device w...
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JP2003077729 |
To improve unbalance attenuation characteristics against the ground by reducing the winding resistance deviation between coils without losing leakage inductance, line capacity, winding working efficiency, and the like in a choke coil hav...
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JP2003068539 |
To provide an electromagnetic equipment that has a simple structure of a magnetic circuit and a wind dress of winding, at the same time, does not require any insulating films, at the same time, reduces a harmonic current, and can vary re...
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JP3403930 |
To enhance testing efficiency in testing the transformation ratio of a transformer by improving the workability. The voltage of the secondary winding 24S of a boosting transformer 24 is measured, as a voltage value in proportion to itsel...
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JP2003061358 |
To prevent increase in size of a coil and shorten the time required for design of a power supply. A coil 4 for control of harmonics is provided between an input terminal 2 and a rectifying circuit 3, so that two conductive wires wound ar...
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JP3400960 |
To provide an automatic voltage controller for preventing the generation of large surge currents or large surge voltages, and for preventing the inter-phase balance of a transformer from being lost even when a load is unbalanced, and for...
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JP2003031426 |
To solve the problem that, if the selection of a plurality of LTC transformers connected in parallel is based on a predetermined order of priority, the tap of the LTC transformer having the highest priority is most frequently changed to ...
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JP2003031427 |
To solve the problem that the conventional three-phase on-load voltage-phase regulating transformer is composed of a main transformer and a separate phase shifter, and needs an area for installing both the main transformer and the phase ...
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JP3391104 |
PURPOSE: To eliminate a rotating mechanism and to simply automatically regulate a voltage by variably controlling a voltage to be applied to the primary winding of a transformer by polarity switching in response to detected voltage. CONS...
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JP2003017339 |
To provide a choke coil capable of decreasing power loss in a power supply circuit and the number of components.A tap 15 is arranged in the center of a main winding 11, a sub-winding 16 is wound from the tap 15 along the main winding 11,...
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JP3385731 |
PURPOSE: To reduce costs a of manufacture of a device and of set up in filed by unifying housing panels of control equipment, etc. CONSTITUTION: In a drive box 36, a special panel 40 is fixed through an insulator 41, and the special pane...
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JP3387238 |
PURPOSE: To realize compactness and to eliminate the need for labor and time for regular maintenance and correction of failures by forming the device of a common control part and three cassette method assembly bodies and by mounting the ...
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JP3387285 |
To prevent chattering at the time of closing a vacuum switch and to ensure a stabilized trip performance regardless of the contacting state of the contact. When a disc cam 40 is rotating, rollers 51, 52 move in the switching groove of th...
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JP2003007549 |
To prevent deterioration of working efficiency of a coil winding, in a single phase transformer which can switch a tap voltage, caused by the work for guiding an intermediate guiding tap wire by automatically and temporarily interrupting...
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JP2003007550 |
To provide a limit switch manipulation mechanism of manual handle which can be manufactured in a shorter period than that of a prior art with less number of components.In the limit switch manipulation mechanism of manual handle 3, when a...
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JP2002359126 |
To provide an inductance component which can obtain proper magnetic bias effect by increasing an insertion amount of a permanent magnet without changing a gap amount. A permanent magnet 13 is disposed in a gap t1 between cores 11, 12 whe...
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JP3378340 |
PURPOSE: To suppress an overcurrent generated at the time of switching a tap, by a method wherein a timer having a time limit adequate to sufficient attenuation of the amount of biased magnetization is used for setting an interval of the...
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JP2002319512 |
To suppress temperature rise at the time of changeover from a first tap to a second tap to contrive miniaturization of an on-load tap changer.In an on-load tap changer, a second tap is operated next to a first tap 13 insulated with insul...
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JP2002291150 |
To provide a commercially usable current limiter device by solving various problems in currently proposed current limiter devices.In this current limiter device with a saturable DC reactor, a DC output terminal of a full wave rectifier i...
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