Full-time domain deformation characteristics of water drop on sheds edge causing insulation failure of large-diameter composite post insulators under heavy rainfall

IF 1.4 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

Iet Science Measurement & Technology Pub Date : 2021-12-25 DOI:10.1049/smt2.12096

Lin Yang, Gaofeng Shang, Yifan Liao, Yijie Sun, Yanpeng Hao, Licheng Li

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Abstract

Insulation failures caused by water drops deformation on insulator sheds edge greatly threaten the stable operation of power grid. However, only few studies have focused on water drops deformation characteristics on insulator sheds edge. In this paper, full-time domain deformation of water drop was defined. The rain tests were performed to study the deformation of water drops and obtain water drops parameters under DC voltage. The water drops deformation parameter was selected according to the state of water drops when arc is generated. A fluid-electric field coupling method is employed to establish simulation model to study the influence of water drops initial diameter, initial mass flow rate, DC voltage, and conductivity on water drops deformation. It is indicated that water drops maximum deformation length before first break in simulation is in good consistency with that obtained from rain tests. The water drops initial diameter, initial mass flow rate, and DC voltage significantly influence the deformation of water drops on sheds edge. Moreover, the water drops may even bridge adjacent sheds in some cases. In contrast, the effect of water drops conductivity on the water drops deformation is not apparent.

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暴雨作用下棚边水滴导致大直径复合柱式绝缘子绝缘破坏的全时域变形特征

绝缘子边缘水滴变形引起的绝缘子失效严重威胁着电网的稳定运行。然而，针对绝缘子棚边缘水滴变形特性的研究较少。本文定义了水滴的全时域变形。通过降雨试验研究了直流电压下水滴的变形，得到了水滴的参数。根据电弧产生时水滴的状态选择水滴变形参数。采用流-电场耦合方法建立仿真模型，研究水滴初始直径、初始质量流量、直流电压、电导率对水滴变形的影响。结果表明，模拟得到的水滴首次破裂前最大变形长度与降雨试验结果吻合较好。水滴的初始直径、初始质量流量和直流电压对水滴在棚边的变形有显著影响。此外，在某些情况下，水滴甚至可能架起相邻的棚屋。相比之下，水滴导电性对水滴变形的影响不明显。

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来源期刊

Iet Science Measurement & Technology 工程技术-工程：电子与电气

CiteScore

4.30

自引率

7.10%

发文量

审稿时长

7.5 months

期刊介绍： IET Science, Measurement & Technology publishes papers in science, engineering and technology underpinning electronic and electrical engineering, nanotechnology and medical instrumentation.The emphasis of the journal is on theory, simulation methodologies and measurement techniques. The major themes of the journal are: - electromagnetism including electromagnetic theory, computational electromagnetics and EMC - properties and applications of dielectric, magnetic, magneto-optic, piezoelectric materials down to the nanometre scale - measurement and instrumentation including sensors, actuators, medical instrumentation, fundamentals of measurement including measurement standards, uncertainty, dissemination and calibration Applications are welcome for illustrative purposes but the novelty and originality should focus on the proposed new methods.