特高压换流变压器低频电流短路法现场加热装置研制及应用

发布时间：2018-01-23 19:36

本文关键词： 特高压换流变压器低频短路法加热现场　出处：《中国电机工程学报》2014年36期 　论文类型：期刊论文

【摘要】：与传统的滤油机热油循环方法相比,短路法具有热量从绝缘内部产生、加热效率高、干燥处理效果理想等优势,适用于特高压换流变等大型变压器的现场加热。但工频电流短路加热装置工作电压高、组成设备多、体积重量大,运输、安装、布置复杂,在变电站现场使用极不方便。为充分发挥短路法加热变压器高效、快速的优势,研制了基于超低频正弦波脉宽调制技术的低频电流短路加热装置。该装置通过降低电源频率减小变压器绕组的感抗,降低了短路加热过程的工作电压,减小了所需电源容量,使得装置构成简单、体积小、重量轻。该装置已成功应用于±800 k V特高压换流变压器的现场加热干燥处理,应用结果表明:低频电流短路法加热装置能够实现大型变压器现场快速均匀加热,并且使用方便、安全,便于现场应用。
[Abstract]:Compared with the traditional hot oil cycle method, the short-circuit method has the advantages of heat generation from the insulation, high heating efficiency, ideal drying effect and so on. It is suitable for field heating of large transformers such as UHV for rheology, but the power frequency current short circuit heating device has high working voltage, many components, large volume and weight, transportation, installation and complicated arrangement. In order to give full play to the advantages of high efficiency and speed of short-circuit heating transformer, it is extremely inconvenient to use in substation. A low frequency current short circuit heating device based on ultralow frequency sine wave pulse width modulation technology is developed. The device reduces the inductance of transformer windings and the working voltage of short circuit heating process by reducing the power supply frequency. By reducing the required power supply capacity, the device is simple in composition, small in volume and light in weight. The device has been successfully applied to the field heating and drying treatment of 卤800kV UHV converter transformer. The application results show that the low frequency current short circuit heating device can realize fast and uniform heating of large transformer, and it is easy to use, safe and convenient for field application.
【作者单位】：中国电力科学研究院;
【分类号】：TM721.1;TM41
【正文快照】： 器的现场加热干燥处理,应用结果表明:低频电流短路法加热装置能够实现大型变压器现场快速均匀加热,并且使用方便、安全,便于现场应用。0引言特高压换流变压器结构复杂、设计制造难度大,其安装工艺要求也更高。根据国内外换流变压器现场安装真空注油的工艺要求,上层油温必须精

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