几个典型倒闸操作中对内部过电压的限制措施.pdfVIP

29 5 Vol 29, No 5 2006 10 Sichuan Electric Pow er T echnology Oct , 2006 ( , 614000) : 内部过电压又称操作过电压或谐振过电压, 对电气设备的安全运行和操作人员的人身安全构成严重威胁 过对几 个典型倒闸操作中( 中性点直接接地系统中停送主变, 带专用旁路母线的变电站进行代路操作, 中性点非直 接接地系统中, 投运电磁式电压互感器, 中性点直接接地系统中母线转热备用) 内部过电压产生的机理, 以及防止过 电压产生的防范措施的作用机理进行 一般性分析, 说明在进行倒闸操作的过程中, 有可能产生内部过电压, 而针对不 同的系统, 不同的设备, 采取不同的防范措施, 则完全可以防止过电压的产生, 从而有效地保护电气设备和操作人员 的人身安全 : ; ; Abstract: Internal overvoltage is called sw itching overvoltage or resonance overvoltage, and it threatens the safe operation of electrical equipm ent and the personal security of operating personnel Through analyzing the mech anism of internal overvoltage com ing into be ing and the m echanism of preventive measures in several typical sw itching operations ( stopping main transform er in neutral point di rectly earthed system , substituting the circu it of substation w ith special byp ass bus; putting electromagnetic potential transformer into operation in the system w ith non- directly earthed neutral; changing busbar to hot standby in neutral point directly earthed system) , it is illustrated that overvoltage w ill com e into being during the process of sw itching operation, so diff erent preventive m easures should be adopted aiming at difference power system and electrical equipment to prevent overvoltage from com ing into being completely and to ensure the security of electrical equipment and operating personnel eff ectively Key words: sw itching operation ; overvoltage; preventive measure :TM862 : A : 1003- 6954( 2006) 05- 0016- 05 , , , , , , , , , , , , ,