提高500kV大型变压器过载能力的研究

Research of 500 kV high-capacity transformer's overload capacity improvement

为解决500 kV大型变压器过载能力制约电网变电容量的问题,从技术角度探讨了变压器的过载能力承受范围,开展了变压器的过载理论分析,提出了包括环境温度、起始负荷、过负荷倍数、油温及热点温度等参数形成的核算边界条件,按照过载能力的核算模型校核变压器本体的过负荷能力,以尽可能释放其过载能力。研究结果表明:500 kV大容量变压器可按照环境温度35℃、起始负荷100%、过载倍数1.8倍、控制变压器油温100℃和绕组热点温度150℃,历时20 m in过载的原则进行生产及运行。

In order to solve the problems of 500 kV high-capacity transformers＇ overload ability constraining power grid capacity,the transformers＇ overload capacity withstanding scope was studied.The theory was presented and boundary conditions were made,including environment temperature,initial load,overload multiple,top oil temperature and hot-spot temperature,and the accounting model was used to check the overload capacity of transformers,which can release the transformers＇ capacity.The results show that 500 kV high-capacity transformers can be produced and run in accordance with the principles of environment temperature 35 ℃,initial load 100%,1.8 times overload,top oil temperature not exceeding 100 ℃,hot-spot temperature not exceeding 150 ℃ and the overload duration not exceeding 20 minutes.