CAJ | 학술논문

为进行超高压输电线路绝缘子串、导线和金具的机械振动疲劳性能研究,参考国内外现有试验方法和标准,采用D-300-2型振动台和KD-3正弦振动控制仪,开发了国内第1套绝缘子串振动试验系统,并在国内首次对盘形悬式绝缘子串和棒形悬式复合绝缘子串进行了大量机械振动试验研究.结果表明,试验对悬垂串绝缘子强度基本无影响,对耐张串影响较大.瓷绝缘子耐张串试验结果有不同程度的降低(约15%),玻璃绝缘子耐张串试验结果变化较小.压接式复合绝缘子经3000万次的振动试验后的机械强度有不同程度的下降,最高下降程度为14%,且分散性较大.基于大量试验研究、工程运行经验和现有技术认识,建议针对现有的技术发展现状,结合工程实际,对不同结构型式的绝缘子串的振动疲劳试验方法和试验参数的合理性及判定准则进行深入研究和探讨,以期能有效地评价其振动疲劳特性.应重点关注复合绝缘子的耐振强度的设计和选择.对于线路经过的易振区,建议采用直径≥24 mm的耐酸芯棒,并提高一个强度等级,甚至采用多串并联运行方式.
위진행초고압수전선로절연자천、도선화금구적궤계진동피로성능연구,삼고국내외현유시험방법화표준,채용D-300-2형진동태화KD-3정현진동공제의,개발료국내제1투절연자천진동시험계통,병재국내수차대반형현식절연자천화봉형현식복합절연자천진행료대량궤계진동시험연구.결과표명,시험대현수천절연자강도기본무영향,대내장천영향교대.자절연자내장천시험결과유불동정도적강저(약15%),파리절연자내장천시험결과변화교소.압접식복합절연자경3000만차적진동시험후적궤계강도유불동정도적하강,최고하강정도위14%,차분산성교대.기우대량시험연구、공정운행경험화현유기술인식,건의침대현유적기술발전현상,결합공정실제,대불동결구형식적절연자천적진동피로시험방법화시험삼수적합이성급판정준칙진행심입연구화탐토,이기능유효지평개기진동피로특성.응중점관주복합절연자적내진강도적설계화선택.대우선로경과적역진구,건의채용직경≥24 mm적내산심봉,병제고일개강도등급,심지채용다천병련운행방식.
In order to research the mechanical vibration fatigue properties of EHV overhead transmission line insulator string, wire and fittings, in the light of domestic and international existent test methods, we adopted D-300-2 type vibration table and KD-3 sinusoidal vibration control instrument, and developed a set of test requirement to meet the requirements of insulator string vibration test systems, to research porcelain and glass suspension insulator string and composite insulators by a lot of mechanical vibration test. The results show that the suspension strings test has no effect on insulator strength, but tension strings test has a greater impact; tension string strength of porcelain insulators is less than normal levels (about 15%), and glass insulator strings strength changes smaller.After 30 million times vibration test for composite insulators with press technology, the mechanical strength of the insulator decreases to some degree, the maximum decline range is 14%. Different test methods for insulator string vibration fatigue and test parameters are proposed, and the reasonableness of the criteria is discussed to effectively evaluate its vibration fatigue properties. It is advised that the design and selection of composite insulators strength should focus on vibration-resistant. For the line in vibration-prone areas, it is suggested that the core diameter of 24 mm and above with anti-acid function should be adopted, and a strength grade should be lifted, even multi-stringparallel operation mode should be adopted.