公开(公告)号：US5552952A

公开(公告)日：1996-09-03

申请号：US327759

申请日：1994-10-21

申请人： Kenneth C. Kramer ,  Roy S. Baker

发明人： Kenneth C. Kramer ,  Roy S. Baker

IPC分类号： H02H3/08 ,  H02H3/10 ,  H02H3/14 ,  H02H3/16 ,  H02H3/20 ,  H02H3/24 ,  H02H3/347 ,  H02H7/122 ,  H02H7/125 ,  H02H3/00

CPC分类号： H02H7/1255

摘要： A protection circuit for a bridge rectifier having a plurality of ac inputs coupled to a plurality of line voltages, and a dc output, comprises monitoring circuits coupled to the line voltages for monitoring the line voltages and generating sequential line-to-line voltage signals, conduction circuits coupled to the monitoring circuits for conducting that portion of each of the sequential line-to-line voltage signals having a given polarity, the conducting circuits generating sequential half wave voltage signals having a given polarity magnitude, and discriminating circuits coupled to the conducting circuits for discriminating a faulted rectifier by monitoring the given polarity magnitude of each of the sequential half wave voltage signals. The discriminating circuits generate a protection signal in response to one of the magnitudes of the sequential half wave voltages signals being less than a threshold.

摘要翻译： 一种用于具有耦合到多个线路电压的多个交流输入和直流输出的桥式整流器的保护电路，包括监控与线路电压相关联的电路，用于监视线路电压并产生顺序的线间电压信号， 耦合到监控电路的导通电路，用于传导具有给定极性的每个顺序线间电压信号的那部分，导电电路产生具有给定极性幅度的顺序半波电压信号，以及鉴别电路耦合到导通 用于通过监视每个顺序半波电压信号的给定极性幅度来识别故障整流器的电路。 识别电路响应于顺序半波电压信号的大小之一小于阈值而产生保护信号。

公开(公告)号：US5521787A

公开(公告)日：1996-05-28

申请号：US98539

申请日：1993-07-28

申请人： Roy S. Baker ,  Kenneth C. Kramer

发明人： Roy S. Baker ,  Kenneth C. Kramer

IPC分类号： H02H3/34 ,  H02H3/00

CPC分类号： H02H3/34

摘要： A system of protection which utilizes a simple circuit for the detection and isolation of single and multiple phase to phase and phase to neutral faults between a multi-phase source of electrical energy and a power conversion device driven therefrom. The circuit comprises a current transformer positioned at the neutral aspect of each phase winding of the multi-phase source of electrical energy. These current transformers sense the current generated by the source of electrical energy and produce a signal of proportional magnitude thereby. These proportional sense signals from each of the individual current transformers are transmitted to a controller which vectorially adds these signals to produce a single summed output signal. The controller monitors the percent ripple content of the summed output signal and generates an output protection signal if the percent ripple content of the monitored summed output signal exceeds a predetermined threshold value for a predetermined time interval. Means are provided responsive to the output protection signal for de-energizing the multi-phase source of electrical energy.

摘要翻译： 一种保护系统，其利用简单的电路来检测和隔离多相电能源与从其驱动的电力转换装置之间的单相和多相相到中间故障。 该电路包括位于多相电能源的每个相绕组中性方面的电流互感器。 这些电流互感器感测由电能源产生的电流，从而产生比例大小的信号。 来自每个单独电流互感器的这些比例感测信号被传送到控制器，该控制器对这些信号进行矢量地相加以产生单个相加的输出信号。 控制器监视相加的输出信号的纹波百分比百分比，并且如果所监视的相加的输出信号的纹波百分比在预定的时间间隔内超过预定阈值，则产生输出保护信号。 提供响应于输出保护信号的装置，用于使多相电能源断电。