| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 41 | Method and apparatus for predicting the zero crossing of the alternating | JP2002502800 | 2001-06-07 | JP4666880B2 | 2011-04-06 | ラース ジョンソン，; マグナス バックマン，; パー ラーソン， |
| 42 | Method and apparatus for predicting the zero crossing of the alternating | JP2002502800 | 2001-06-07 | JP2003536211A | 2003-12-02 | ラース ジョンソン，; マグナス バックマン，; パー ラーソン， |
| (57)【要約】 電流経路（２）における電流を遮断するために電流経路に配設された電気開閉装置（１）を開放するのに最適の時間を決定するために電流経路において故障電流が発生した後に交流のゼロ交差を予測する装置（１４）は、電流経路における電流を検出することができる部材（１５）を具備する。 構造（１９）は、検出された交流値に基づいて電流の直流レベルと経時的な直流レベルの減衰を計算し、さらに、少なくとも当該電流検出を通じて得られた電流値、計算された直流レベル、計算された直流減衰および交流の時間周期に関する情報に基づいて交流の未来のゼロ交差時間を予測することができる。 | ||||||
| 43 | Method and apparatus for control of parallel-off of generator | JP2000210679 | 2000-07-06 | JP2001224134A | 2001-08-17 | NANBA SHIGEAKI; UDA KENGO; FUKAI MASAYUKI |
| PROBLEM TO BE SOLVED: To provide a method and an apparatus, for the control of the parallel- off of a generator, in which the sound-side generator shaft of a generator main circuit can be protected from a generator-current zero-point transition phenomenon. SOLUTION: When the possibility of generation of the generator-current zero-point transition phenomenon can be estimated, individual electrical accident elements which cause the phenomenon, or the signal of the output of a generator lockout relay which integrates the elements in terms of a circuit, are used. A time delay by a timer is caused deliverately. Synchronization of an event is prevented. Alternatively, when the event can be estimated through calculation, the output of the reactive power of the generator is increased. As a result, a generator-excitation current control operation, in which the generator is paralleled off in such a way that the AC current amplitude of a sound-shaft generator is increased and that a current zero pint is eliminated is constituted, so as to be built in a control mechanism. | ||||||
| 44 | Phase control switching device | JP36290598 | 1998-12-21 | JP2000188044A | 2000-07-04 | ITO HIROMOTO; KAYAMA HARUHIKO; HIDAKA MIKIO |
| PROBLEM TO BE SOLVED: To quickly, accurately size the current zero point of accident current wave from, control asymmetrical current, and diagnose the soundness of a breaker by installing a current zero point selecting means which selects the current zero point and uses as a target breaking point, and an operation starting means which calculates operation synchronizing time, sends a control operation instruction of a power switch, and starts the operation of the power switch. SOLUTION: Current or current gradient flowing between terminals on the fixed side and the moving side of a breaker 2 connected to a power bus bar 5 is measured with a current measuring part 71 or a current gradient measuring part 72, a measured value is converted into voltage, to input in a reference phase detecting part 41A. When an opening instruction is sent to the breaker 2, the reference phase detecting part 41A measures current zero point time and a current gradient zero point time of each phase, and detects a reference point every 1/4 cycles. Current wave form is predicted based on detected reference points, an opening phase control operation based on optional time is made possible, and short circuit fault current or load current is accurately interrupted in short control time and prescribed arc time. COPYRIGHT: (C)2000,JPO | ||||||
| 45 | 3-phase shortcircuit current interrupting method | JP18965883 | 1983-10-11 | JPS6082016A | 1985-05-10 | NAKAJIMA MASATOSHI; MORITA AKIRA |
| 46 | Power switchgear | US13818837 | 2011-10-06 | US09324521B2 | 2016-04-26 | Yuta Nakayama; Tomotaka Yano; Taehyun Kim |
| A vacuum valve includes a fixed side electrode on a fixed side current-carrying shaft and a movable side electrode on a movable side current-carrying shaft. An opening and closing unit is coaxially disposed with the movable side current-carrying shaft, and drives the movable side current-carrying shaft. A chattering suppression structure is coaxially disposed with the fixed side current-carrying shaft on the fixed side of the vacuum valve, and suppresses chattering. The opening and closing unit includes an electromagnetic operating mechanism which drives the movable side current-carrying shaft when energized. A contact pressure spring is coaxially disposed with the electromagnetic operating mechanism, and applies contact pressure between the movable side electrode and the fixed side electrode during contact closing of the vacuum valve. A release spring is coaxially disposed with the electromagnetic operating mechanism, and assists driving force of the electromagnetic operating mechanism during contact opening of the vacuum valve. | ||||||
| 47 | Pole-mounted hook device for electric utility applications | US11868754 | 2007-10-08 | US07775570B2 | 2010-08-17 | Todd Taylor |
| A hook device for coupling with a universal pole such as a utility pole or hot stick performs a plurality of functions including at least physically engaging a component of a utility device. The hook device has a base having an axis with a pole attachment for coupling with the universal pole. An arm extends from the base along the axis of the base at the arm's upper portion and bends at an elbow at a right angle extending in a forearm, which, together with the axis of the base define a first plane. A hook portion is connected to the forearm and has a geometry in a second plane at the first angle from the axis of the forearm. An end portion is connected to the hook portion and has the same axis as the forearm. A finger is angled from the axis of the forearm at the third angle and angled from the axis of the base at the second angle. | ||||||
| 48 | POLE-MOUNTED HOOK DEVICE FOR ELECTRIC UTILITY APPLICATIONS | US11868754 | 2007-10-08 | US20090091147A1 | 2009-04-09 | Todd Taylor |
| A hook device for coupling with a universal pole such as a utility pole or hot stick performs a plurality of functions including at least physically engaging a component of a utility device. The hook device has a base having an axis with a pole attachment for coupling with the universal pole. An arm extends from the base along the axis of the base at the arm's upper portion and bends at an elbow at a right angle extending in a forearm, which, together with the axis of the base define a first plane. A hook portion is connected to the forearm and has a geometry in a second plane at the first angle from the axis of the forearm. An end portion is connected to the hook portion and has the same axis as the forearm. A finger is angled from the axis of the forearm at the third angle and angled from the axis of the base at the second angle. | ||||||
| 49 | Method and device for prediction of a zero-crossing alternating current | US10297402 | 2001-06-07 | US07010436B2 | 2006-03-07 | Per Larsson; Magnus Backman; Lars Jonsson |
| An apparatus (14) for detecting a zero-crossing of an alternating current after occurrence of a fault in a current path (2) for determining a suitable time for opening an electric switching device (2) arranged in the current path for breaking the current in the current path comprises members (15) adapted to detect the current in the current path. An arrangement (19) is adapted to calculate the dc-level of the current and the decay of the dc-level with time on the basis of values of the alternating current detected and also predict the time for a future zero-crossing of the alternating current on the basis of at least current values obtained through said current detection, the dc-level calculated, the dc-decay calculated and information about the period time of the alternating current. | ||||||
| 50 | Method and device for prediction of a zero-crossing alternating current | US10297402 | 2003-06-04 | US20040090719A1 | 2004-05-13 | Per Larsson; Magnus Backman; Lars Jonsson |
| An apparatus (14) for detecting a zero crossing of an alternating current after occurrence of a fault in a current path (2) for determining a suitable time for opening an electric switching device (2) arranged in the current path for breaking the current in the current path comprises members (15) adapted to detect the current in the current path. An arrangement (19) is adapted to calculate the dc-level of the current and the decay of the dc-level with time on the basis of values of the alternating current detected and also predict the time for a future zero-crossing of the alternating current on the basis of at least current values obtained through said current detection, the dc-level calculated, the dc-decay calculated and information about the period time of the alternating current. | ||||||
| 51 | Method and system for real-time prediction of zero crossings of fault currents | US09467139 | 1999-12-20 | US06597999B1 | 2003-07-22 | Gautam Sinha; William James Premerlani; Vlatko Vlatkovic |
| A method for predicting zero crossings of fault currents in a multi-phase power system includes sensing a fault current in each respective phase, estimating parameters of a model of each respective fault current, and independently using the estimated parameters for each respective fault current to predict a zero crossing of the respective fault current. | ||||||
| 52 | Phase control switching system | US09339678 | 1999-06-24 | US06172863B2 | 2001-01-09 | Hiroki Ito; Haruhiko Kohyama; Mikio Hidaka |
| A phase control switching system for controlling opening and closing timings of a power switching device to suppress the occurrence of an exciting rush current or a make-and-break surge voltage which is severe to system equipment such as a transformer, a reactor and a capacitor bank, or for controlling an arcing time of a circuit breaker to put the circuit breaker into operation for the arcing time leading to no-re-ignition or for the optimal breaking time. In the phase control switching system, a current measuring section or a current gradient measuring section is provided to measure a current value or a current gradient value of a current to be broken or introduced, and a reference phase detecting section estimates a current zero point of a current waveform on the basis of the measurements. Subsequently, a control section, upon receipt of an opening/closing command, an opening phase control operation using an arbitrary time point after the current waveform estimation as a reference. | ||||||
| 53 | Method of controlling transient recovery voltage and gas insulation switch gear using the same | US529398 | 1995-09-18 | US5821496A | 1998-10-13 | Eisaku Mizufune; Takashi Sato; Katsuichi Kashimura; Osamu Koyanagi; Yoshihito Asai; Yukio Korosawa |
| The steep initial rate of rise of the transient recovery voltage across the poles of a circuit breaker just after a fault current break is decreased. The breaking performance in the case of a short-circuit fault to ground taking place in an electrical power transmission system at relatively as near a place as several kilometers apart from the circuit breaker, that is a short-line-fault is improved by a saturable reactor having a capacitor connected in parallel therewith to the circuit breaker in series. As a result, as the saturable reactor changes from the magnetically saturated state to the unsaturated state just before the zero point of the fault current, the self-inductance of the saturable reactor gradually increases and an LC resonance is produced between the self-inductance of the saturable reactor and the capacitor connected to the saturable reactor in parallel. Therefore, the peak value and the time period of the current flowing from the saturable reactor can be controlled to control the initial rate of rise of the transient recovery voltage. | ||||||
| 54 | Predictive control circuit and method for circuit interrupter | US576247 | 1995-12-21 | US5793594A | 1998-08-11 | James K. Niemira; Raymond P. O'Leary |
| A control circuit and method are provided for a circuit interrupter that predicts the occurrence of fault-current zero crossings. This prediction is utilized to control the operation of a circuit interrupter at a desirable point in the periodic wave form of the fault current. For example, the control circuit is useful to control a synchronous interrupter by accurately generating a trip signal to the synchronous interrupter for operation in the vicinity of the zero crossing of the current wave form. In a preferred arrangement, the control circuit utilizes the quotient of a sensed current signal and the time rate of change of the sensed current signal. In one specific arrangement for circuit environments that might include conditions that could lead to false results, the time rate of change of the quotient is utilized to provide a control signal. | ||||||
| 55 | Synchronization of switchgear switching to waveform indices | US503460 | 1995-07-17 | US5679986A | 1997-10-21 | Arthur H. Iversen |
| There is described method and apparatus to obtain synchronized switching of switchgear. A superposition of forces is used wherein the moving contacts of switchgear driven by a conventional operating mechanism has a secondary force, either opposing or aiding, superimposed upon the mechanism force under predetermined conditions to incrementally either slow down or speed up the moving contact. The computed secondary force is applied by a small servo-motor attached to the moving contact shaft. The energy of the secondary force is derived from a real time comparison of the measured position of the moving contact with its preprogrammed position in ROM at each predetermined point on the voltage or current waveform. From this comparison the required pulse energy is calculated and fed to the servo-motor which translates into the secondary force of appropriate duration thereby making the necessary incremental velocity correction. These corrections cause the moving contact to follow a preprogrammed time-distance curve such that there is a smooth time convergence of contact make and the zero voltage cross-over. The secondary force is much smaller than the mechanism force and serves only to correct for changes in moving contact travel time to closure caused by environmental effects such as temperature, pressure and age, as well as from waveform changes due to waveform distortion and frequency changes. | ||||||
| 56 | Grounding switch gear device | US225979 | 1994-04-12 | US5543597A | 1996-08-06 | Atsuji Watanabe; Youichi Ohshita; Masatomo Ohno; Masanori Tsukushi; Shunji Tokuyama |
| A first puffer chamber is formed by a puffer cylinder having a substantially cylindrical flange portion and a shaft portion, and a fixedly disposed piston. The piston is formed in a cylindrical shape sealed with respect to an external space, and is constituted to be accommodated in the flange portion of the puffer cylinder at the circuit breaking position of the circuit breaking unit. The internal space of the piston is constituted as a second puffer chamber which is designed to communicate with the first puffer chamber. The gas accumulated in the second puffer chamber is continuously blown out toward between the electrodes, thereby prolonging an effective interruptable arc time span without increasing the size of the circuit interrupting unit and operating unit. | ||||||
| 57 | Alternating current circuit breaker having a control for timing opening relative to the current wave | US3555354D | 1969-03-11 | US3555354A | 1971-01-12 | KOTOS PETER |
| Discloses a fault current responsive opening control for an AC circuit breaker which is capable of fully separating its contacts within an operating time of less than 4 milliseconds following reception of a tripping signal from the control. The control comprises means for measuring during each full loop of fault current the time period from zero crossing to peak current. Means responsive to the length of this time period delivers a tripping signal to the circuit breaker at a point between peak current and the immediately following current zero if the measured time period exceeds a preselected value at least as great as said operating time.
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| 58 | Circuit breaker control circuit | US29471363 | 1963-07-12 | US3292047A | 1966-12-13 | HUAN LEE CHIA |
| 59 | Circuit interrupter control responsive to wave form | US30756663 | 1963-09-09 | US3243656A | 1966-03-29 | JOHN BAUDE |
| 60 | Synchronously tripped circuit breaker | US44672042 | 1942-06-12 | US2372139A | 1945-03-20 | SICKLE ROSWELL C VAN |
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