An electric fire prevention apparatus is provided to prevent the electric fire by detecting a short circuit, an electric leakage, an arc, and a tracking through measurement of current and voltage signals on a line. A voltage detection unit(11) detects a voltage signal on a line from a voltage sensor. A current detection unit(12) detects a current signal on the line from a current sensor. An A/D converter(20) converts the detected analog signal into a digital signal. A signal processor(30) performs one or more among functions to decide a short circuit by comparing a slope of an effective value with a reference value by calculating one or more among the effective value, a delay time, harmonics, and a shoulder value, to decide an electric leakage by comparing a leakage current with the reference value, to decide the generation of the tracking by comparing the rate of increase of the harmonics with the reference value in an electric leakage state, and to decide the generation of the arc by comparing the effective value of the current, the width of the shoulder, the delay time, the rate of increase of the harmonics with the reference values. A display unit(41) displays the process result of the signal processor.
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机译：提供一种电气防火装置，通过测量线路上的电流和电压信号来检测短路，漏电，电弧和跟踪，以防止电气火灾。电压检测单元（11）从电压传感器检测在线上的电压信号。电流检测单元（12）从电流传感器检测在线上的电流信号。 A / D转换器（20）将检测到的模拟信号转换为数字信号。信号处理器（30）通过计算有效值，延迟时间，谐波和肩值中的一个或多个，将有效值的斜率与参考值进行比较，从而执行一项或多项功能来确定短路，通过将泄漏电流与参考值进行比较来确定漏电，通过在漏电状态下将谐波的增加速率与参考值进行比较来确定跟踪的产生，并通过以下方式确定电弧的产生：将电流的有效值，肩宽，延迟时间，谐波的增加速率与参考值进行比较。显示单元（41）显示信号处理器的处理结果。
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