Implementation of on-site isolation method for single-phase grounding faults in distribution networks based on resistive phase detection technology
In the small current grounding system of distribution network,the single-phase grounding fault isolation technology mainly includes power frequency parameter method,high frequency parameter method and external signal method,but there are prob-lems such as poor detectability,many interference factors and low fault tolerance rate.The current distribution and zero sequence ad-mittance phase Angle characteristics of the system are analyzed.The amplification effect of the different resistance values of the system neutral point on the fault current amplitude and the phase shift effect of the zero sequence admittance phase Angle are studied.In this paper,a method based on the resistive phase detection technique is proposed to realize the isolation of single-phase grounding fault in situ,which makes the fault characteristic measure have high detectability and the fault path have identifiability.The true type experi-ments show that the resistive phase protection is not affected by the interference factors such as the fault medium characteristic of the ground point,arc suppression coil,power flow direction and installation direction,and the protection resistance is as high as 3kΩ.The protection technology is mature,low cost,easy to realize,simple parameter setting,and can be widely popularized.
distribution networksmall current grounding systemSingle-phase Grounding FaultDynamic resistancephase protectionhigh resistance grounding
孙立成、王明、张征凯、贾延海、张宇、李元香、ZHANG Zhngrui
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国网安徽省电力有限公司电力科学研究院,合肥 230601
国网安徽省电力有限公司,合肥 230000
国网安徽省电力有限公司马鞍山供电公司,安徽马鞍山 243000
State Grid Anhui Electric Power Supply Company Ma'anshan Electric Power Co.,Ltd.,Ma'anshan,Anhui,243000,China
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