Research on safety protection monitoring device for high-voltage cable joint
高压电缆接头安全防护监测装置研究

摘要

本文研制了高压电缆接头安全防护监测装置，主要由光纤光栅解调仪、光纤光栅温度传感器和全氟己酮灭火装置组成。光纤光栅温度传感器安装在中间接头冷缩绝缘管的外表面，在大电流和高电压的情况下，中间接头因为大接触电阻或局部放电等情况产生的热量通过冷缩绝缘管，传递到光纤光栅温度传感器，进而导致反射波长的移位，最终达到对电缆中间接头温度的实时在线监测，温度超过一定报警值时联动全氟己酮装置进行降温灭火，达到电缆接头防护的目的。

Abstract

This study developed a safety protection monitoring device for high-voltage cable joints, primarily comprising a fiber Bragg grating demodulator, fiber Bragg grating temperature sensors, and a perfluorohexanone fire suppression system. The fiber Bragg grating temperature sensors are installed on the outer surface of the cold-shrink insulation tube of the cable intermediate joint. Under high-current and high-voltage conditions, heat generated by factors such as excessive contact resistance or partial discharge is transferred through the cold-shrink insulation tube to the sensors. This heat transfer induces a shift in the reflected wavelength, enabling real-time online temperature monitoring of the cable intermediate joint. When temperatures exceed a preset threshold, the system triggers the perfluorohexanone fire suppression device to achieve cooling and fire extinguishing, thus fulfilling the purpose of protecting cable joints.