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发明公开
CN104330676A 一种变电站过电压智能监测系统及方法 无效 - 驳回

一种变电站过电压智能监测系统及方法
摘要：
本发明公开了一种变电站过电压智能监测系统及方法，该方法包括以下步骤：步骤1：采集过电压信号；采用过电压传感器检测是否有过电压发生，取零序信号分量U0(n)超过0.1的时刻为过电压发生时刻；截取过电压发生时刻前的时间段tf＝20ms，过电压发生时刻后的时间段tt＝40ms为过电压计算时间段，共计60ms；以200kHz采用频率获取过电压时间段的U0(n)；步骤2：提取U0(n)的时域特征、频域特征和时频特征；步骤3：对过电压信号进行故障分类。该变电站过电压智能监测系统及方法易于实施，能自动进行故障分类及预警。
摘要（英）：

The invention discloses a transformer substation overvoltage intelligence monitoring system and a transformer substation overvoltage intelligence monitoring method. The transformer substation overvoltage intelligence monitoring method includes following steps: step 1, collecting overvoltage signals, using an overvoltage sensor to detect whether overvoltage occurs, and using the moment when a zero sequence signal component U0(n) exceeds 0.1 as an overvoltage occurrence moment; intercepting a time period tf of 20ms before the overvoltage occurrence moment and a time period tt of 40ms after the overvoltage occurrence moment, using the sum of the time period tf and the time period tt, equal to 60ms, as an overvoltage calculation time period, and using frequency of 200kHz to obtain the zero sequence signal component U0(n) in the overvoltage time period; step 2, extracting time domain features, frequency domain features and time frequency features of the zero sequence signal component U0(n); step 3, performing fault classification on the overvoltage signals. The transformer substation overvoltage intelligence monitoring system and the transformer substation overvoltage intelligence monitoring method are easy to implement, and can automatically perform the fault classification and early warning.

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