文章摘要
杨帆,李广,沈煜,等.中压配电网单相接地故障熄弧后的电气特征分析[J].电力系统自动化. DOI: 10.7500/AEPS20180911007.
, et al.Electrical Characteristics of Medium Voltage Distribution Network with Single-phase-to-ground Fault after Arc Extinction[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20180911007.
中压配电网单相接地故障熄弧后的电气特征分析
Electrical Characteristics of Medium Voltage Distribution Network with Single-phase-to-ground Fault after Arc Extinction
DOI:10.7500/AEPS20180911007
关键词: 配电网  单相接地  熄弧  系统恢复  电气特征
KeyWords: distribution network  single-phase grounding  arc-extinguishing  system recovery  electrical characteristics
上网日期:2019-02-01
基金项目:国家自然科学基金
作者单位E-mail
杨帆 国网湖北省电力有限公司电力科学研究院 yangf_82@163.com 
李广 中国石油大学(华东) lig2017@126.com 
沈煜 国网湖北省电力有限公司电力科学研究院 totoshenyu@163.com 
薛永端 中国石油大学(华东) xyd70@126.com 
彭辉 国网湖北综合能源服务有限公司 pengh9@hb.sgcc.com.cn 
徐丙垠 山东科汇电力自动化股份有限公司 xuby@vip.163.com 
摘要:
      配电网单相接地故障熄弧后的电气变化规律不仅决定过电压水平、电弧是否重燃以及重燃时的电气特征,更将对故障诊断方法的适应性与可靠性产生影响。利用配电网单相接地故障等值电路对系统故障恢复过程进行了分析,发现不同接地方式系统的零序网络在熄弧后均存在衰减的振荡过程,其中不接地系统的零序电压幅值大、振荡频率远低于工频、持续时间长,相电压存在较长时间的过电压,经消弧线圈接地系统的零序电压幅值大、振荡频率略大于工频、持续时间一般在5个周波以上,由于拍频现象会导致故障相1.1倍以内的过电压,小电阻接地系统振荡频率远高于工频且幅值小、衰减速度快。利用ATP-EMTP验证了三种接地方式系统单相接地熄弧后恢复过程符合上述规律。
Abstract:
      The electrical variation law, of the single-phase grounding fault in distribution network after arc-extinguishing, determines not only the over-voltage level, the re-ignition of the arc and the electrical characteristics during re-ignition, but also the adaptability and reliability of the fault diagnosis method. The system fault recovery process is analyzed by using the single-phase grounding fault equivalent circuit of the distribution network. It is found that there will be attenuated oscillation process after arc-extinguishing in all the zero-sequence network of different grounding systems. For ungrounded system, the zero-sequence voltage amplitude is large. Its oscillation frequency is much lower than the power frequency, and the duration is long. The overvoltage of the phase will last for a long time. For arc suppression coil grounding system, the zero sequence voltage amplitude is large. Its oscillation frequency is slightly larger than the power frequency, and the duration is generally above 5 cycles. The beat frequency phenomenon will cause overvoltage whose amplitude is within 1.1 times of the normal level on the fault phase. For low resistance grounding system, the oscillation frequency is much higher than the power frequency. Its amplitude is small and the attenuation speed is fast. The correctness of the recovery process of single-phase grounding fault after arc-extinguishing in three types of grounding systems is verified by ATP-EMTP.
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