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21.发明授权Circuit interrupter providing protection and waveform capture for harmonic analysis 失效电路断路器为谐波分析提供保护和波形捕获
公开(公告)号：US5600527A
公开(公告)日：1997-02-04
申请号：US363193
申请日：1994-12-22
IPC分类号： G01R23/20 , G01R21/133 , H02H1/00 , H02H3/04 , H02H3/093 , H02H3/10 , H02H3/50 , H02H3/52 , H02H3/00
CPC分类号： G01R21/133 , H02H3/0935 , H02H1/0007 , H02H3/04 , H02H3/50
摘要： A circuit breaker with a digital trip unit has a protection mode and a waveform capture mode of operation. In the protection mode, an equivalent sampling technique based upon pairs of samples spaced 90 electrical degrees apart with a pattern of delays between pairs is used to digitize the waveforms in the protected electrical system. Synchronous sampling is used in the waveform capture mode. The value of each sample is monitored in the waveform capture mode and a transfer is made back to the protection mode if a threshold value indicating an overcurrent condition is exceeded. The percentage total harmonic distortion, and per harmonic distortion for harmonics, up to and including the 27th are sequentially presented on a display on the front panel of the circuit breaker and can be transmitted along with the raw waveform data to a remote processor.
摘要翻译： 具有数字跳闸单元的断路器具有保护模式和波形捕捉操作模式。 在保护模式中，使用基于成对的样本的等效采样技术，其间隔90度电角度与成对之间的延迟模式间的数字化，以保护电气系统中的波形。 在波形捕捉模式下使用同步采样。 如果超过表示过电流条件的阈值，则以波形捕获模式监视每个采样的值，并将转移回保护模式。 直到并包括第27次谐波的总谐波失真和谐波失真百分比顺序呈现在断路器的前面板上的显示器上，并且可以与原始波形数据一起传输到远程处理器。
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22.发明授权Circuit and method for DC content protection of parallel VSCF power systems 失效并联VSCF电力系统直流内容保护的电路和方法
公开(公告)号：US4905117A
公开(公告)日：1990-02-27
申请号：US240185
申请日：1988-09-02
申请人： Mirza A. Beg
发明人： Mirza A. Beg
CPC分类号： H02J3/36 , H02H3/50 , Y02E60/60 , Y10T307/576 , Y10T307/724
摘要： A method of selectively isolating faulty channels in a parallel electric power system having at least two controllable AC power sources includes the steps of producing a DC content signal representative of the magnitude of DC voltage in an AC output of one of the power sources and producing a differential current signal representative of differential DC current flowing in connected phases of the power sources. The DC content and differential current signals are combined to produce an error signal which is used to control the operation of the first power source, thereby reducing the magnitude of DC voltage in its output. When the error signal exceeds a predetermined threshold level, a trip signal can be produced and used to selectively isolate a failed channel in the power system. Following isolation of the channels, the differential current signal is disabled such that the error signal is only representative of the DC content signal for split channel operation.
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公开(公告)号：US4879623A
公开(公告)日：1989-11-07
申请号：US803285
申请日：1985-12-02
CPC分类号： H02H7/0833 , H02H3/50
摘要： Motor control systems having solid-state components are commonly used on industrial vehicles such as lift trucks. Such solid-state components are easily damaged by excessive transient voltages. The subject invention includes a power supply for supplying direct current to a motor circuit, wherein the direct current has a nominal direct current voltage value and as associated transient voltage component. A pulse control circuit supplies current pulses from the power supply to a motor. A sensing device controllably produces a fault signal in response to the amplitude and frequency of occurrence of the transient voltage component exceeding a predetermined maximum value. An override circuit receives the fault signal and responsively modifies the current pulses delivered from the power supply to the associated motor.
摘要翻译： 具有固态部件的电动机控制系统通常用于诸如起重车的工业车辆上。 这种固态元件容易被过大的瞬态电压损坏。 本发明包括用于向电动机电路提供直流电的电源，其中直流具有标称直流电压值和相关联的瞬态电压分量。 脉冲控制电路将来自电源的电流脉冲提供给电动机。 感测装置响应于超过预定最大值的瞬态电压分量的发生的振幅和频率可控地产生故障信号。 超控电路接收故障信号并且响应地修改从电源传送到相关联的电动机的电流脉冲。
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公开(公告)号：US4556842A
公开(公告)日：1985-12-03
申请号：US517497
申请日：1983-07-26
申请人： Mark A. Rosswurm
发明人： Mark A. Rosswurm
CPC分类号： H02H3/50 , G01R19/0015
摘要： The DC content of an AC waveform is detected by a digital filter which partially filters each phase of the waveform and applies the filtered waveforms sequentially through a multiplexer to a sample and hold circuit which measures the instantaneous value of each phase at two points which are spaced an exact odd number of half cycles apart. The time interval between the measurement points is adjusted according to variations in the AC waveform frequency to maintain required spacing. The measured instantaneous values are fed by an analog to digital converter and to a microprocessor system which averages the two readings to generate a signal corresponding to the DC content for each phase.
摘要翻译： AC波形的直流内容由数字滤波器检测，该数字滤波器部分滤波波形的每一相，并将经滤波的波形顺序地通过多路复用器施加到采样和保持电路，该采样和保持电路测量两相间隔的每个相位的瞬时值 一个确切奇数的半个周期。 根据交流波形频率的变化调整测量点之间的时间间隔，以保持所需的间隔。 测量的瞬时值由模数转换器和微处理器系统馈送，微处理器系统对两个读数进行平均以产生对应于每相的DC内容的信号。
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公开(公告)号：US4326230A
公开(公告)日：1982-04-20
申请号：US165809
申请日：1980-07-03
申请人： Michael Becker , Klaus Renz , Manfred Weibelzahl , Alfons Fendt , Dusan Povh , Gerhard Schuch , Hermann Waldmann
发明人： Michael Becker , Klaus Renz , Manfred Weibelzahl , Alfons Fendt , Dusan Povh , Gerhard Schuch , Hermann Waldmann
摘要： A circuit for monitoring the voltage stress of a capacitor which produces an over-stress indicator signal responsive to the over-voltage history of the capacitor. If the measured voltage stress of the capacitor exceeds a predetermined over-voltage value, a characteristic-curve generator, having a predetermined transfer function, produces an output signal which is responsive to the measured voltage stress of the capacitor and the transfer function of the characteristic-curve generator. This signal is combined with a further signal which is responsive to a predetermined permissible continuous operation voltage value. The combined signals are conducted to an integrator having a predetermined integration time constant for producing an overload signal. The overload signal at the output of the integrator is a measure of the state of stress of the capacitor. Circuitry may be provided for disconnecting the capacitor from a transmission line in response to the output signal of the integrator. Also, plural capacitor voltage stress monitoring stages may be combined to monitor the capacitor voltage stress in a plurality of over-voltage ranges.
摘要翻译： 用于监测电容器的电压应力的电路，其产生响应于电容器的过电压历史的过应力指示器信号。 如果电容器的测量电压应力超过预定的过电压值，则具有预定传递函数的特性曲线发生器产生响应于测量的电容器的电压和特性的传递函数的输出信号 曲线发生器。 该信号与响应于预定允许的连续工作电压值的另一信号组合。 组合的信号被传导到具有预定积分时间常数的积分器，以产生过载信号。 积分器输出端的过载信号是电容器应力状态的测量。 可以提供电路，用于响应于积分器的输出信号将电容器与传输线路断开。 此外，可以组合多个电容器电压应力监测级以监测多个过电压范围内的电容器电压应力。
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公开(公告)号：US4152656A
公开(公告)日：1979-05-01
申请号：US808527
申请日：1977-06-21
申请人： Janos Udvardi-Lakos
发明人： Janos Udvardi-Lakos
摘要： Apparatus for the rapid monitoring of an alternating (a-c) variable with respect to amplitude, frequency and phase which includes a generator circuit for forming, from an actual a-c voltage imaging the monitored a-c variable, a reference a-c voltage of predetermined amplitude and frequency which is linked to the former in rigid phase relationship, and comparators for comparing individual signals of the generator circuit with the instantaneous values of the actual value a-c voltage, permitting recognition of disturbances in a time which is substantially shorter than one period of the a-c variable monitored.
摘要翻译： 用于快速监测相对于振幅，频率和相位的交流（ac）变量的装置，其包括用于从对所监视的交流变量成像的实际交流电压形成预定幅度和频率的参考交流电压的发生器电路， 与刚性相位关系的前者相关联，以及用于将发电机电路的各个信号与实际值交流电压的瞬时值进行比较的比较器，允许在比所监测的交流变量的一个周期短的时间内识别干扰。
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公开(公告)号：US2368084A
公开(公告)日：1945-01-30
申请号：US45642642
申请日：1942-08-27
申请人： GEN MOTORS CORP
发明人： ALEXANDER DONALD F
IPC分类号： H02H3/50
CPC分类号： H02H3/50
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公开(公告)号：US11451047B2
公开(公告)日：2022-09-20
申请号：US15942020
申请日：2018-03-30
申请人： TechHold, LLC
发明人： David Anderson , Greg Fuchs , Frederick R. Faxvog
摘要： A circuit includes a detector and controller circuit configured to detect a high field RF (radio frequency) electromagnetic fields indicating a potential of an electromagnetic pulse event capable of damaging electrical equipment connected to a power grid. The circuit also includes controller receiving an input from the detector circuit, the controller being included within a shielded enclosure and configured to initiate an event in response to detection of the high field electromagnetic pulse field to remove the electrical equipment from the power grid.
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公开(公告)号：US11088526B2
公开(公告)日：2021-08-10
申请号：US16305109
申请日：2016-05-31
发明人： Peter Schegner , Jörg Meyer , Karsten Wenzlaff
摘要： An arcing fault recognition unit is for an electric low-voltage circuit. In an embodiment, the arcing fault recognition unit includes at least one current sensor for periodically ascertaining electric current values in the electric circuit, the current sensor being connected to an analysis unit which is designed in such a way that an arcing fault recognition signal is output when a variation in the rate of current rise exceeds a first threshold value or drops below a second threshold value.
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公开(公告)号：US20200321768A1
公开(公告)日：2020-10-08
申请号：US16305109
申请日：2016-05-31
发明人： Peter SCHEGNER , Joerg MEYER , Karsten WENZLAFF
摘要： An arcing fault recognition unit is for an electric low-voltage circuit. In an embodiment, the arcing fault recognition unit includes at least one current sensor for periodically ascertaining electric current values in the electric circuit, the current sensor being connected to an analysis unit which is designed in such a way that an arcing fault recognition signal is output when a variation in the rate of current rise exceeds a first threshold value or drops below a second threshold value.
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