内蒙古电力技术
內矇古電力技術
내몽고전력기술
Inner Mongolia Electric Power
2015年
5期
72-74
,共3页
10 kV线路%低频减载保护%铁磁谐振%单相接地%测频%二次消谐
10 kV線路%低頻減載保護%鐵磁諧振%單相接地%測頻%二次消諧
10 kV선로%저빈감재보호%철자해진%단상접지%측빈%이차소해
10 kV lines%under-frequency loading shedding%ferro-resonance%single-phase earthing%frequency measurement%secondary harmonic elimination
某变电站10 kV系统发生接地故障，引起多条10 kV线路低频减载保护连续误动作。通过对现场故障录波波形及UT-9911A线路保护装置低频减载保护频率算法进行分析，认为10 kV系统单相接地引起的铁磁谐振导致母线电压严重畸变，保护装置测频出错，进而造成低频减载保护误动作。更换二次消谐装置后该变电站再未发生同类故障。并就此类故障提出相应的防范措施。
某變電站10 kV繫統髮生接地故障，引起多條10 kV線路低頻減載保護連續誤動作。通過對現場故障錄波波形及UT-9911A線路保護裝置低頻減載保護頻率算法進行分析，認為10 kV繫統單相接地引起的鐵磁諧振導緻母線電壓嚴重畸變，保護裝置測頻齣錯，進而造成低頻減載保護誤動作。更換二次消諧裝置後該變電站再未髮生同類故障。併就此類故障提齣相應的防範措施。
모변전참10 kV계통발생접지고장，인기다조10 kV선로저빈감재보호련속오동작。통과대현장고장록파파형급UT-9911A선로보호장치저빈감재보호빈솔산법진행분석，인위10 kV계통단상접지인기적철자해진도치모선전압엄중기변，보호장치측빈출착，진이조성저빈감재보호오동작。경환이차소해장치후해변전참재미발생동류고장。병취차류고장제출상응적방범조시。
Grounding fault occured in the 10 kV power system in some substation, which caused protection misoperation of some 10 kV lines constantly. The analysis of fault waveform and frequency algorithm of under-frequency load shedding device concluded that ferro-resonance was the cause of protection misoperation of under-frequency load shedding, leading to bus voltage aberrance seriously, wrong frequency measurement for protection device, which caused protection misoperation. And take the measurement of replaying the secondary harmonic elimination. Simultaneously, some preventive measures were raised to avoid the same faults.
