公开(公告)号：US06662124B2

公开(公告)日：2003-12-09

申请号：US10124858

申请日：2002-04-17

申请人： Edmund O. Schweitzer, III ,  Luther S. Anderson ,  Armando Guzman-Casillas ,  Gregary C. Zweigle ,  Gabriel Benmouyal

发明人： Edmund O. Schweitzer, III ,  Luther S. Anderson ,  Armando Guzman-Casillas ,  Gregary C. Zweigle ,  Gabriel Benmouyal

IPC分类号： G01R1902

CPC分类号： H02H1/0007 ,  H02H3/40

摘要： The relay system obtains voltage and current values from a power line and uses a first sampling element to sample the voltage and current values at selected intervals of time. The resulting sampled signals are used for power system-wide protection, control, monitoring and metering. The sampled signals are then resampled at a rate which is a selected multiple of the power system frequency. The results of the resampling are used by processing circuitry for protection functions including fault determinations.

摘要翻译： 继电器系统从电力线获得电压和电流值，并使用第一采样元件在选定的时间间隔对电压和电流值进行采样。 所得到的采样信号用于电力系统范围的保护，控制，监测和计量。 然后，采样信号以电力系统频率的选定倍数的速率重新采样。 重采样的结果由处理电路用于保护功能，包括故障确定。

公开(公告)号：US06308139B1

公开(公告)日：2001-10-23

申请号：US08765726

申请日：1997-06-25

申请人： Thomas Reck ,  Tevfik Sezi

发明人： Thomas Reck ,  Tevfik Sezi

IPC分类号： G01R1902

CPC分类号： G01R19/02

摘要： A digital process for determining the effective value of a periodic electric test signal is provided, where the test signal is sampled during a sampling interval that differs in duration from the period of the test signal, and after performing an analog-digital conversion of the samples, they are squared, added up and averaged. The square root of the resulting average is calculated. To be able to determine the effective value rapidly and with a high accuracy according to this invention with a sampling interval that corresponds to two periods of the electric test signal with an odd numbered M of samplings with N samples that fall in one period of the test signal, the values up to and including the Nth sample are squared and added up. To this is added a correction factor that corresponds to half of the square of a subtotal formed from one-quarter of the Nth sample and three-quarters of the (N+1)th sample, where N=(M−1)/2. Then the average is calculated over the number M/2.

摘要翻译： 提供了用于确定周期性电测试信号的有效值的数字处理，其中测试信号在与测试信号的周期不同的采样间隔期间被采样，并且在执行样本的模数转换之后 他们是平方的，加起来平均。 计算所得平均值的平方根。 为了能够根据本发明快速且高准确地确定有效值，其采样间隔对应于电测试信号的两个周期，具有奇数个M的采样，其中N个采样落在测试的一个周期内 信号，直到并包括第N个样本的值被平方并相加。 为此添加了对应于从第N个样本的四分之一和第（N + 1）个样本的四分之三形成的小计的平方的一半的校正因子，其中N =（M-1）/ 2 。 然后平均值计算在M / 2的数量。