基于信号注入法的电容电流测量仪研究
Research of Measurement Apparatus of Capacitance Current Based on Signal-injection Method
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摘要: 随着电缆在中压配电网的大量应用,系统电容电流水平不断增高。准确便捷地测量配电网系统对地电容电流成为该领域研究的热点。文章设计了一种基于信号注入法的电容电流测试仪,该测试仪采用直接数字频率合成（DDFS）技术产生变频电流信号,运用傅氏算法对中性点非直接接地系统的电容电流进行测量,具有较高的精度,使用方便、灵活。Abstract: Accompany with adoption of cable in medium voltage distribution network,the level of capa-citance current of the system increases.More and more researchers focus on how to measure the capacitance current to the ground of the distribution network system precisely and swiftly.The paper designed a measurement apparatus of capacitance current based on signal-injection method,which made use of direct digi-tal frequency synthetics(DDFS) technology to produce various frequency signal of current and made use of Fourier to measure the capacitance current of neutral non-valid grounded system.It has advantages of high precision,convenient and flexible for use.
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