刘渠江

摘 要：随着电力系统的高速发展，大型变压器的应用需求不断提升，其一般配置有独立的变压器油冷却器及冷却器控制系统。变压器冷却系统发挥着自动调节变压器油温的作用，但是变压器冷却系统涉及的元件较多，控制逻辑比较复杂，导致变压器运行过程中故障多发。大型变压器的稳定运行离不开冷却系统的正常工作，500 kV及以上电压等级的变压器对冷却系统提出了更高的要求。冷控系统应能自动投切冷却器，以保证主变温度处于合理范围内，并能在冷却系统设备出现故障时发出相应信号提示运维人员。本文主要探讨500 kV变压器冷控系统常见的故障类型及处理措施。

关键词：变压器;冷控系统;故障类型

中图分类号：TM63文献标识码：A文章编号：1003-5168（2021）04-0063-04

Abstract： With the rapid development of the power system， the application requirements of large transformers continue to increase， which are generally equipped with independent transformer oil coolers and cooler control systems. The transformer cooling system plays the role of automatically adjusting the transformer oil temperature， but the transformer cooling system involves many components and the control logic is more complicated， which leads to frequent faults during the operation of the transformer.The stable operation of large transformer is inseparable from the normal work of the cooling system， the transformer of 500kV and above voltage level puts forward higher requirements for the cooling system. The cooling control system should be able to automatically switch the fan to ensure that the main oil temperature is in the normal range and send corresponding signals to prompt the operation and maintenance personnel when the cooling system equipment fails. This paper mainly discussed the common failure types and treatment measures of 500 kV transformer cold control system.

Keywords： transformer;cold control system;fault types

500 kV變压器是500 kV变电站的核心设备，承担着远距离输电的重要职责。变压器的安全稳定运行对区域供电可靠性具有显著影响。这就要求对变压器的故障处理准确和及时，保证变压器在良好工况下运行。大型变压器的附件较多，主要附件为冷却系统、油枕、瓦斯继电器、压力释放阀等检测或调节变压器油运行状况的元件。变压器油在变压器结构中具有重要作用。变压器油是变压器内部的绝缘和冷却介质，温度是反映其运行状况的一个主要参数。由于变压器油会随着温度异常升高而加速劣化，所以作为调节变压器油温的主要附件，变压器冷却系统的正常工作对变压器的安全运行有较大的影响。……