[1]王麗麗,劉宏亮,高樹國,等.特高壓變壓器中局部放電脈沖電流傳播特性的仿真研究[J].高壓電器,2018,54(11):227-232.[doi:10.13296/j.1001-1609.hva.2018.11.033]
 WANG Lili,LIU Hongliang,GAO Shuguo,et al.Simulation on Propagation Characteristics of Partial Discharge Current in UHV Transformers[J].High Voltage Apparatus,2018,54(11):227-232.[doi:10.13296/j.1001-1609.hva.2018.11.033]
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特高壓變壓器中局部放電脈沖電流傳播特性的仿真研究()
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《高壓電器》[ISSN:1001-1609/CN:61-11271/TM]

卷:
第54卷
期數:
2018年11期
頁碼:
227-232
欄目:
電力變壓器局部放電檢測及狀態評估
出版日期:
2018-11-05

文章信息/Info

Title:
Simulation on Propagation Characteristics of Partial Discharge Current in UHV Transformers
作者:
王麗麗1劉宏亮1高樹國1範輝1齊輝2
1. 國網河北省電力有限公司電力科學研究院, 石家莊 050021; 2. 國網河北省有限公司石家莊分公司, 石家莊 050021
Author(s):
WANG Lili1 LIU Hongliang1 GAO Shuguo1 FAN Hui1 QI Hui2
1. State Grid Hebei Electric Power Co., Ltd. Electric Power Research Institute, Shijiazhuang 050021, China; 2. State Grid Hebei Electric Power Co., Ltd. Shijiazhuang Power Supply Branch, Shijiazhuang 050021, China
關鍵詞:
特高壓變壓器 多導體傳輸線 局部放電 傳播特性 有限元
Keywords:
UHV transformer MTL PD propagation characteristics FEM
DOI:
10.13296/j.1001-1609.hva.2018.11.033
文獻標志碼:
A
摘要:
特高壓變壓器是特高壓輸電系統的核心部分,局部放電的有效檢測是保證其安全可靠運行的重要手段。而局部放電信號在繞組中傳播會出現衰減畸變,給准確判斷變壓器故障帶來困難。爲了研究局部放電在特高壓變壓器中的傳播特性,基于多導體傳輸線理論,結合特高壓變壓器單相五柱式結構特點,建立三維有限元簡化單柱模型,計算了繞組的電阻、電容和電感分布參數。通過求解傳輸線方程得到特高壓變壓器中部出線處發生局部放電時繞組各匝響應,分析了局部放電信號在繞組中的傳播規律。局部放電信號在繞組中以一定速度傳播,繞組電壓出現持續時間較長的低頻率振蕩,而電流幅值沿著繞組傳播有明顯衰減,主要通過繞組與鐵心或者箱體之間的電容流入大地。
Abstract:
Effective detection of partial discharge(PD)in ultra high voltage(UHV)transformer is very important to ensure safe and reliable operation of UHV power transmission system. Propagation of PD signal in transformer windings causes signal attenuation and distortion, which makes accurate fault diagnosis of transformer difficult. In this paper, a finite element model of one-pole transformer winding is established based on the theory of multi-conductor transmission line(MTL)and the single-phase 5-pole structure features of a UHV transformer to study the propagation characteristics of PD signals. The distribution parameters of resistance, capacitance and inductance of the windings are calculated. By solving the MTL equation,the response of each turn in the winding is obtained while PD occurs at the outlet of the UHV transformer. The propagation characteristics of PD are analyzed. Results show that: 1)the PD signal propagates in the winding at a certain speed; 2)the voltage has low-frequency oscillation with a long duration; and 3)the current attenuates significantly along the winding and flows mainly into the ground through the capacitance between the winding and the core or transformer case.

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備注/Memo

備注/Memo:
收稿日期:2018-03-27; 修回日期:2018-05-19.王麗麗(1986—),女,工程師,主要從事電氣設備試驗及故障診斷工作。 劉宏亮(1980—),男,正高級工程師,主要從事電氣設備試驗及故障診斷工作。
更新日期/Last Update: 2018-11-25