[1]王昊晴,孙 岗,王宁华,等.特高压气体绝缘输电线路壳体出厂试验气密性检测方法研究[J].高压电器,2020,56(03):197-202.[doi:10.13296/j.1001-1609.hva.2020.03.029 ]
 WANG Haoqing,SUN Gang,WANG Ninghua,et al.Research on Air Tightness Detection Method for Enclosure Routine Test of UHV Gas-insulated Transmission Line[J].High Voltage Apparatus,2020,56(03):197-202.[doi:10.13296/j.1001-1609.hva.2020.03.029 ]
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特高压气体绝缘输电线路壳体出厂试验气密性检测方法研究()
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《高压电器》[ISSN:1001-1609/CN:61-11271/TM]

卷:
第56卷
期数:
2020年03期
页码:
197-202
栏目:
技术讨论
出版日期:
2020-03-30

文章信息/Info

Title:
Research on Air Tightness Detection Method for Enclosure Routine Test of UHV Gas-insulated Transmission Line
作者:
王昊晴1 孙 岗2 王宁华2 张鹏飞2 李向阳1 林金阳1 刘 宁1
(1. 中国电力科学研究院有限公司, 北京 100192; 2. 国家电网有限公司, 北京 100031)
Author(s):
WANG Haoqing1 SUN Gang2 WANG Ninghua2 ZHANG Pengfei2 LI Xiangyang1LIN Jinyang1 LIU Ning1
(1. China Electric Power Research Institute Co., Ltd., Beijing 100192, China; 2. State Grid Corporation of China,Beijing 100031, China)
关键词:
气体绝缘金属封闭输电线路 气密性 氦检漏 出厂试验
Keywords:
gas-insulated transmission line(GIL) air tightness helium leakage detection routine test
DOI:
10.13296/j.1001-1609.hva.2020.03.029
摘要:
正在建设的淮南—南京—上海1 000 kV交流特高压输变电工程长江大跨越的跨江输电采用了气体绝缘输电线路(gas?insulated transmission line, GIL),其GIL单个单元最大长度为18 m,外径达到900 mm,因此与一般的气体绝缘封闭开关设备(GIS)相比,GIL相对具有更大的发生内部绝缘气体泄漏的可能性。为了保证GIL运行时的绝缘强度并防止外界环境对于GIL内部的影响,以往要求小于等于0.5%/年的泄漏率已经不能满足,本工程将该要求提高到小于等于0.01%/年。文中的目的是研究在型式试验和出厂试验的气密性检测中可行的方法,并通过试验确定对提高出厂试验的效率极为关键的充氦保压时间这一参数。试验中分析了两种常见的气密性检测方法,提出为满足本工程要求应该使用真空箱氦检漏的气密性检测方案,然后利用标准漏率的漏孔和18 m GIL试品工件试验研究和论证了特高压长距离GIL壳体气密性检测中的充氦保压时间。试验结果表明真空箱氦检漏法足以满足本工程要求的GIL单元的气密性检测精度和效率,试验得到的充氦保压时间也为将真空箱氦检漏法推广用于特高压GIL的气密性出厂试验提供了依据。
Abstract:
Gas-insulated Transmission Line (GIL) is very suitable for the power transmission across the Changjiang River in Huainan-Nanjing-Shanghai 1000 kV UHV project because of its high reliability and long endurance. Because the size of GIL unit in this project are 18 m in length and 900 mm in diameter, the probability of leakage is higher than GIS whose leakage rate is ≤ 0.5% per year in standard, and the leakage rate is prescribed as ≤ 0.01% per year in this project in order to enhance the dielectric strength and to avoid the external influence. The object of this paper is to obtain an air tightness method that is useful in type test and routine test, and to determine the duration in keeping Helium pressure for leakage detection that is important for accuracy and efficiency in routine test. In the test, two common methods of air tightness detection are analyzed, and the air tightness detection scheme of helium leak detection of vacuum box is proposed to meet the requirements of the project. In addition, the duration in keeping Helium pressure for leakage detection of GIL is studied with standard leakage unit and 18 m GIL unit, respectively. The experimental results indicate that Helium leakage detection method is enough for leakage detection with the required accuracy and efficiency. Moreover, the duration in keeping Helium pressure is useful for employing Helium leakage detection in the routine test of UHV GIL.

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备注/Memo

备注/Memo:
收稿日期:2019-12-20; 修回日期:2020-02-24 基金项目:国家电网公司特高压工程专项(长距离特高压GIL型式试验及气密性出厂、交接试验技术研究)。 Project Supported by UHV Projects of SGCC(Study in Routine Test and Commissioning Test for Ultra High Voltage Gas-insulated Line with Long Distance).王昊晴(1987—),男,硕士,工程师,研究方向为高压开关设备运行和试验检测技术以及真空开断技术。
更新日期/Last Update: 2020-03-15