摘要
大型接地网由于进线回数较多,进行接地阻抗测量时必须更加考虑分流系数的影响。通过大量的实测研究,提出了大型接地网分流系数的准确测量方法和注意事项。并研究了不同强度背景干扰下分流小电流信号测试时提高信噪比的方法,提出了有针对性的抗干扰措施:提供基准相位的无线选频通讯仪应布置在变电站中央空旷地带,且不宜靠近变压器器身、干式电抗器等强辐射源,以免受强电场干扰影响无线信号传输质量;测量电缆屏蔽层的分流大小时,应同一回进线的三相同时测量,这样可以减小工频干扰的影响;一般情况下,与避雷线相连的出线龙门架有多根入地钢架或水泥杆,应每个引下杆均分别测量,而不是仅仅测量有接地引下线的杆,以免造成分流的漏测。并现场验证了新方法的准确性。
Due to the more lines of large grounding grid, the effect of the shunt coefficient must be considered in the measurement of the grounding impedance. Through a large number of testing and analysis, The author presents the accurate measurement method and note items of shunt coefficient of large grounding grid, researches the methods of improving the signal-to-noise ratio of small distribution current signal test on different background intensity interference, puts forward some corresponding anti- interference measures, and confirms the accuracy of the new method on-site. The research results have a certain reference value for testing the shunt coefficient of large grounding grid.
出处
《电瓷避雷器》
CAS
北大核心
2015年第5期134-138,共5页
Insulators and Surge Arresters
关键词
分流系数
接地网
抗干扰
接地阻抗
小信号
the shunt coefficient
grounding grid
anti-interference
grounding impedance, small signal
