220kV变电站地下电缆工频磁场长、短期变化规律分析

Analysis on long-term and short-term varying trends of magnetic fields induced by underground cables in 220kV transformer substation

本文收集了北京地区一个典型220 k V变电站厂界处220 k V地下电缆的工频磁场自动监测系统3年的数据,通过工频磁感应强度与电流强度相关性分析及监测数据长期、短期、瞬时变化规律分析,发现工频磁感应强度与电流强度具有强相关性;且工频磁感应强度冬季高于夏季,工作日高于周末,一天中峰值出现在9~10点与18~22点;针对变化规律得出的结论可为相关的实际监测工作提供借鉴。

Quantity of magnetic flux density data for 3 years are retrieved from the automatic monitoring system located in the boundary of 220 k V transformer substation for monitoring magnetic fields generated from 220 k V underground cables,and analysis on long- term,short- term,instantaneous monitoring data as well as the correlation between power frequency magnetic flux density and current density are carried out. It is revealed that magnetic flux density is significantly related to current density,the magnetic flux density in winter and work days are higher than that in summer and weekends respectively,and peak magnetic flux density within one day presents in 9- 10 AM and 18- 22 PM.Based on the analysis results,some suggestions in terms of in- situ measurements are put forward.