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| 摘要: |
| 为解决接地网及其他谐波对接地网接地电阻测量的影响,提高测量精度,采用正弦脉宽调制SPWM (Sinusoidal Pulse-Width Modulation)、数字频率合成DDFS(Direct Digital Frequency Synthesis)及微处理器控制技术,研制出了多功能接地电阻测量装置.该装置基于变频测量原理控制电源按设定的频率点输出交流信号,并经电流极注入接地网(频率范围30～70 Hz),在对电压极、电流极的测量值进行数字滤波及离散傅里叶变换DFT(Discrete Fourier Transfom)后,依据获得的电压、电流同相分量计算出接地网接地阻抗及阻性分量.型式试验及现场测量结果表明,该装置操作方便、性能稳定,有效地消除了工频干扰以及谐波干扰,测量数据准确可靠,符合<接地装置特性参数测量导则>对接地网接地电阻测量的要求,适合接地网接地阻抗、土壤电阻率、导通电阻的测量. |
| 关键词: 接地网 接地电阻测量装置 变频测量 数字滤波 离散傅里叶变换 |
| DOI： |
| 分类号:TM934.15 |
| 基金项目: |
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| Multi-functional grounding resistance measuring equipment |
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NI Wei1 ZHANG Yue2
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| Abstract: |
| A multi-functional grounding resistance measuring equipment based on SPWM(Sinusoidal Pulse-Width Modulation),DDFS(Direct Digital Frequency Synthesis) and microprocessor control technology is developed to reduce the influences of grounding grids and harmonics and improve measurement precision.Based on variable-frequency measurement principle,it injects AC signal with preset frequency(30~70 Hz) into grounding grids via current probe and calculates the grounding impedance and resistance based on the co-phase c... |
| Key words: grounding grids grounding resistance measuring equipment variable-frequency measurement digital filtering DFT |
