电力系统保护与控制
電力繫統保護與控製
전력계통보호여공제
Power System Protection and Control
2015年
17期
87-92
,共6页
晃电%电流变化率%故障识别%直流分量%快速保护
晃電%電流變化率%故障識彆%直流分量%快速保護
황전%전류변화솔%고장식별%직류분량%쾌속보호
voltage sag%change rate of current%fault identification%DC component%rapid protection
晃电严重影响化工、冶金等工矿企业的生产安全。现有的治理晃电措施主要从用电设备着手，理想的办法是从晃电本身着手，快速切除故障或者投入备用电源，把晃电过程时间降到对用电设备影响最小。从快速切除故障方面来降低晃电的影响，分析故障前后电流采样值的大小和变化率，从而制定出以电流采样值的变化率和绝对值共同识别故障的快速保护方案。为了提高故障识别的准确性，在判断之前消除正常运行时直流分量的影响。经仿真验证，该快速保护方案能够对系统中任何类型的故障都能够快速、准确地识别出故障，在故障后5 ms使继电保护出口动作。
晃電嚴重影響化工、冶金等工礦企業的生產安全。現有的治理晃電措施主要從用電設備著手，理想的辦法是從晃電本身著手，快速切除故障或者投入備用電源，把晃電過程時間降到對用電設備影響最小。從快速切除故障方麵來降低晃電的影響，分析故障前後電流採樣值的大小和變化率，從而製定齣以電流採樣值的變化率和絕對值共同識彆故障的快速保護方案。為瞭提高故障識彆的準確性，在判斷之前消除正常運行時直流分量的影響。經倣真驗證，該快速保護方案能夠對繫統中任何類型的故障都能夠快速、準確地識彆齣故障，在故障後5 ms使繼電保護齣口動作。
황전엄중영향화공、야금등공광기업적생산안전。현유적치리황전조시주요종용전설비착수，이상적판법시종황전본신착수，쾌속절제고장혹자투입비용전원，파황전과정시간강도대용전설비영향최소。종쾌속절제고장방면래강저황전적영향，분석고장전후전류채양치적대소화변화솔，종이제정출이전류채양치적변화솔화절대치공동식별고장적쾌속보호방안。위료제고고장식별적준학성，재판단지전소제정상운행시직류분량적영향。경방진험증，해쾌속보호방안능구대계통중임하류형적고장도능구쾌속、준학지식별출고장，재고장후5 ms사계전보호출구동작。
Voltage sag seriously impacts the safety of industrial enterprise such as chemical industry, metallurgy, etc. Existing governance for voltage sag mainly adopts electrical equipment measures, the ideal way is to research voltage sag itself. The impact of voltage sag on electrical equipment can be decreased to minimum by rapidly removing faults or putting into standby power. Reducing the influence of voltage sag by using rapid removal of fault, this paper develops a rapid protection program for identifying the fault by jointly using change rate and absolute value of current sampling value before and after fault. In order to improve the accuracy of fault identification, the DC component of the normal operation should be eliminated before determination. Simulation shows the fast protection scheme is able to quickly and accurately determine any type of fault in power system and makes relay operate after fault occurred 5 ms.
