公开(公告)号：US06744391B2

公开(公告)日：2004-06-01

申请号：US10147641

申请日：2002-05-16

申请人： Travis L. Mooney ,  Tony J. Lee ,  Bruce A. Hall

发明人： Travis L. Mooney ,  Tony J. Lee ,  Bruce A. Hall

IPC分类号： H03M100

CPC分类号： H02H1/0007 ,  G01R19/2509 ,  H02H3/38

摘要： The system includes a unipolar A/D converter, which samples analog signal inputs thereto, the A/D converter being used in a protective relay for electric power systems. The unipolar A/D converter is responsive to input voltage values and current values from the power line to produce corresponding digital signals. The A/D converter has a ground pin voltage reference at least as negative as the most negative point of the input signal to be processed.

摘要翻译： 该系统包括单模A / D转换器，其对模拟信号输入进行采样，该A / D转换器用于电力系统的保护继电器。 单极A / D转换器响应来自电源线的输入电压值和电流值，产生相应的数字信号。 A / D转换器的接地引脚电压基准至少与要处理的输入信号的最大负点一样负。

公开(公告)号：US06910804B2

公开(公告)日：2005-06-28

申请号：US10658858

申请日：2003-09-09

申请人： Carl V. Mattoon ,  Travis L. Mooney

发明人： Carl V. Mattoon ,  Travis L. Mooney

IPC分类号： G01K7/16 ,  G01K7/20 ,  G01K7/21 ,  G01K15/00 ,  H04B3/02 ,  H04B3/28

CPC分类号： H04B3/02 ,  G01K1/026 ,  G01K7/20 ,  G01K15/00 ,  H04B3/28

摘要： An RTD system includes multiple pluralities of RTDs and RTD bank assembly to which each plurality of RTDs are connected. Each RTD bank assembly includes a current source for the RTDs connected thereto, a multiplexer switching system for switching the current source successively between the RTDs, and a measurement function for measuring the voltage drop across the RTDs produced by the current source. The system includes a circuit for determining resistance of the RTD from the current applied thereto and the voltage drop there across. The system further includes a plurality of low pass filters associated, respectively, with each RTD, wherein the low pass filters are charged before the voltage measurement is made. The system includes a precharging arrangement where the low pass filter associated with the next RTD in a voltage sampling sequence is precharged, so that the delay between sampling of the voltage from the low pass filters associated with successive RTDs is significantly reduced. The system further includes low pass filters associated with calibration resistors which permit sampling of voltage values from the RTDs prior to the low pass filters associated therewith being fully charged, without error which would otherwise occur.

摘要翻译： RTD系统包括多个RTD和RTD组合组合，多个RTD连接到该组件。 每个RTD组组件包括用于连接到其上的RTD的电流源，用于在RTD之间连续切换电流源的多路开关系统和用于测量由电流源产生的RTD上的电压降的测量功能。 该系统包括用于从施加到其上的电流确定RTD的电阻和其上的电压降的电路。 该系统还包括分别与每个RTD相关联的多个低通滤波器，其中在进行电压测量之前对低通滤波器进行充电。 该系统包括预充电装置，其中与电压采样序列中的下一RTD相关联的低通滤波器被预充电，使得来自与连续RTD相关联的低通滤波器的电压的采样之间的延迟显着降低。 该系统还包括与校准电阻器相关联的低通滤波器，其允许在与其相关联的低通滤波器完全充电之前从RTD采样电压值，否则将发生错误。