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Patent Searching and Data


Matches 501 - 550 out of 1,978

Document Document Title
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...  
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...  
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 ...  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
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 ...  
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...  
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...  
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 ...  
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...  
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 ...  
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...  
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...  
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...  
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 ...  
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...  
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...  
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 ...  
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...  
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 ...  
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...  
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...  
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...  
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 ...  
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...  
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...  
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...  
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...  
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...  
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...  
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 ...  
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 ...  
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...  
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,...  
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...  
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 ...  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
JP2002280229
To commonly use a changeover switch in gas insulation and an oil insulation by reducing in size the dimension of the switch using a vacuum valve in a cut-off unit of an on-load tap changer.The on-load tap changer is insulated by the insu...  
JP2002280228
To form a structure, having interchangeability for use with a changeover switch using a vacuum valve in a cut-off unit of an on-load tap changer, rather than a changeover switch of a conventional on-load tap changer.The on-load tap chang...  

Matches 501 - 550 out of 1,978