500kV以上超高电压等级油浸式变压器荧光光纤温度监测系统研究

Fluorescence Fiber Temperature Monitoring System Reserach Used for Above 500kV Ultra High Voltage Level Oil-immersed Transformers

超高压油浸式变压器内部绕组温度实时监测是保障变压器可靠运行的重要部分,现有的超高压油浸式变压器内部绕组温度是通过绕组温度计算模型推算而来。变压器内部热点温度,除了线圈发热通过热传递引起其他位置温度的变化外,还与变压器线圈附近的磁通量有关,通过模型推算变压器内部温度分布,误差较大。本文论述了基于荧光余晖衰减特性与温度关系,研究出一种荧光光纤温度传感技术,给出了传感器荧光材料特性、结构封装,验证了传感器的测温精度和所使用材料的安全可靠性。该温度监测系统已经成功应用500kV以上超高压等级油浸式变压器中,实现了超高压油浸式变压器内部绕组温度真正意义上的在线监测。

Internal winding temperature real-time monitoring is an important part of guarantee reliable operation in ultra high voltage level oil-immersed transformers, the existing way to measure internal winding temperature through calculation and winding temperature calculation model. The impact of transformers internal hot-spot temperature is not only the coil temperature fever caused by heat transfer to other position changes but also the magnetic flux close to the transformer coil. Through the model calculated the temperature distribution inside the transformer have big error. This paper discusses based on the fluorescent light attenuation and temperature, find a fluorescence optical fiber temperature sensing technology, provide fluorescent sensor material properties and package structure, Verify the temperature measurement precision of the sensor and the safety and reliability of the used materials. The temperature monitoring system has been successfully applied above 500 kV ultra high voltage level oil-immersed transformers, realize the ultrahigh pressure oil-immersed transformer winding temperature on-line monitoring.