中性点灵活接地技术在桐乡电网20 kV改造中的应用
|
摘要
首先对桐乡地区进行20 kV改造后出现的20 kV馈线高跳闸率进行分析,明晰配网中性点以单一经小电阻接地是问题所在;其次从国内外研究现状出发,借鉴10 kV层面混合接地的相关思路,提出在20 kV层面开展灵活接地的设想,确立技术原理、划设工作流程;再次结合桐乡电网实际运行工况,就20 kV灵活接地的实现进行一、二次设计和定值整定,重点对与消弧线圈并接的小电阻的投切回路作了双重化配置,以及小电阻投入失败的应急补救设计;最后以2个变电所实际运行数据为依托,分析了灵活接地的投运功效。
Firstly, the high tripping rate of 20 kV feeder line after 20 kV reconstruction in Tongxiang area is analyzed, and it is clear that the reason is that the neutral point of distribution network is grounded by a single small resistance. Then, based on the research status home and abroad, the idea of developing flexible grounding at 20 kV level is proposed based on the relevant ideas of 10 kV hybrid grounding, with the technical principle and working flow being set up. Combined with the actual operating conditions of Tongxiang power grid, the first and second circuit design and setting of 20 kV flexible grounding are carried out, with emphasis on the dual configuration of the switching circuit of small resistance parallel to the arc suppression coil, and the remedial design of the failure of small resistance switching in emergency. Finally, based on the actual operation data of two substations, the commissioning effect of the flexible grounding was analyzed.
Firstly, the high tripping rate of 20 kV feeder line after 20 kV reconstruction in Tongxiang area is analyzed, and it is clear that the reason is that the neutral point of distribution network is grounded by a single small resistance. Then, based on the research status home and abroad, the idea of developing flexible grounding at 20 kV level is proposed based on the relevant ideas of 10 kV hybrid grounding, with the technical principle and working flow being set up. Combined with the actual operating conditions of Tongxiang power grid, the first and second circuit design and setting of 20 kV flexible grounding are carried out, with emphasis on the dual configuration of the switching circuit of small resistance parallel to the arc suppression coil, and the remedial design of the failure of small resistance switching in emergency. Finally, based on the actual operation data of two substations, the commissioning effect of the flexible grounding was analyzed.
引文
[1]贾晨曦,杨龙月,杜贵府.全电流补偿消弧线圈关键技术综述[J].电力系统保护与控制,2015,20(9):46-49.
[2]马春艳,袁兆强.关于配电系统中性点接地方式的探讨[J].自动化技术与应用,2006,25(2):74-76.
[3]朱维明,徐建强,仇群辉,等.关于20 k V配电网灵活接地方式若干问题的探讨[J].浙江电力,2012,40(7):6-9.
[4]刘健,刘超,张小庆,等.配电网多级继电保护配合的关键技术研究[J].电力系统保护与控制,2015(9):94-98.
[5]Xiangjun Zeng,Yao Xu,Yuanyuan Wang.Some novel techniques for insulation parameters measurement and petersen-coil control in distribution systems[J].IEEE Transactions on Industrial Electronics,2010,57(4):1445-1451.
[6]李甜甜.20 kV配电网中性点接地方式与继电保护改造的研究[D].北京:北京交通大学,2010:72.
[7]王斌.配网20 kV改造中灵活接地的设计及应用[J].中国电业(技术版),2015,22(8):101-107.
[8]周灵江,陈希存,赵张磊,等.20 kV配电网中性点接地方式的切换控制[J].电气技术,2015,17(6):54-58.
[9]马勇,魏旭,周志成,等.配电网灵活接地方式运行特性的仿真研究[J].江苏电机工程,2011,33(15):102-104.
[10]苑经纬,宋云东,张新宇,等.基于灵活选线的谐振接地方式适应性分析及应用研究[J].东北电力技术,2018(9):46-49.
[2]马春艳,袁兆强.关于配电系统中性点接地方式的探讨[J].自动化技术与应用,2006,25(2):74-76.
[3]朱维明,徐建强,仇群辉,等.关于20 k V配电网灵活接地方式若干问题的探讨[J].浙江电力,2012,40(7):6-9.
[4]刘健,刘超,张小庆,等.配电网多级继电保护配合的关键技术研究[J].电力系统保护与控制,2015(9):94-98.
[5]Xiangjun Zeng,Yao Xu,Yuanyuan Wang.Some novel techniques for insulation parameters measurement and petersen-coil control in distribution systems[J].IEEE Transactions on Industrial Electronics,2010,57(4):1445-1451.
[6]李甜甜.20 kV配电网中性点接地方式与继电保护改造的研究[D].北京:北京交通大学,2010:72.
[7]王斌.配网20 kV改造中灵活接地的设计及应用[J].中国电业(技术版),2015,22(8):101-107.
[8]周灵江,陈希存,赵张磊,等.20 kV配电网中性点接地方式的切换控制[J].电气技术,2015,17(6):54-58.
[9]马勇,魏旭,周志成,等.配电网灵活接地方式运行特性的仿真研究[J].江苏电机工程,2011,33(15):102-104.
[10]苑经纬,宋云东,张新宇,等.基于灵活选线的谐振接地方式适应性分析及应用研究[J].东北电力技术,2018(9):46-49.