高压GIS壳体环流及损耗计算模型研究
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TM85

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国网辽宁省电力有限公司科技项目2018YF-55


Circulation and loss calculation model of high voltage GIS shell
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State Grid Liaoning Electric Power Co. , Ltd. . Science and Technology Project 2018 yf-55

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    摘要:

    高压气体绝缘全封闭组合电器(GIS)壳体环流会产生很大的环流损耗,引起设备发热,长期运行将直接影响系统的输送容量和设备绝缘性能。文中为提高GIS壳体环流计算精度,简化计算程序,提高工程设计人员及现场运维人员使用效率,应用大电流母线和工程电磁场基础理论,提出空心电流互感器原理,建立GIS壳体环流等效模型。针对550 kV GIS稳态运行及短路故障工况,对不同位置壳体、短接线、接地线环流进行等效计算,给出环流及损耗分布规律。计算结果表明:550 kV GIS稳态运行时,位于进、出线端的短接线环流值大于其他位置;故障状态下故障点就近接地线上电流值最大;接地线和短接线计算电流大于实测值,主要为接地电阻分布引起。通过计算可给出GIS系统损耗总量,为GIS实际运行提供理论指导。

    Abstract:

    High-voltage gas insulate switchgear(GIS) shell circulation is the main cause of operating losses in substations. Circulation can cause the device to heat up. If the substation is operated for a long time, the transmission capacity of the power system and the insulation performance of the equipment will be seriously affected. The purpose of this article is to simplify the loss calculation procedure and improve the calculation accuracy of GIS shell circulation and the efficiency of engineering designers and on-site operation and maintenance. The basic theory of high current bus and engineering electromagnetic field is applied. Based on the principle of hollow current transformers, an equivalent model of GIS shell circulation is established. For steady-state operation of 550 kV GIS and short-circuit fault conditions, circulating currents of shells, short wiring, and grounding wires at different locations are calculated. The circulation and loss distribution rules are given. The calculation results show that when the 550 kV GIS is in steady-state operation, the short-circuit circulating current value at the inlet and outlet ends is greater than other locations; the current value at the fault point near the ground wire is the largest in the fault state; the calculated current of the ground wire and the short wire is greater than the measured value, mainly it is caused by the distribution of grounding resistance. The total loss of GIS system is given through calculation, which gives theoretical guidance for the actual operation of GIS.

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赵义松,宋成伟,邢凯,刘馨然,王飞鸣,郎福成.高压GIS壳体环流及损耗计算模型研究[J].电力工程技术,2021,40(1):201-207

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历史
  • 收稿日期:2020-07-29
  • 最后修改日期:2020-09-03
  • 录用日期:2020-08-04
  • 在线发布日期: 2021-02-03
  • 出版日期: 2021-01-28