基于热路法的环网柜T型电缆接头导体温度检测研究

摘要

针对目前环网柜电缆温度监测方法的不足之处,基于改进的热路模型,提出了一种环网柜T型电缆接头温度在线监测方法.该方法仅需检测出T型绝缘护套和环境温度即可反演出内部导体温度,搭建了模拟环网柜内T型连接头真实运行状况的实验平台,进行了电缆温升实验,利用实测值与计算值对比,验证了热路模型的正确性.实验数据表明:稳态时计算结果的相对误差小于5.4%;暂态时计算结果的相对误差小于9.0%.利用热路模型可以实时监测电缆接头温度状况,保障了环网柜和电缆线路的安全运行.%An on-line temperature monitoring method for T type cable joint of ring network cabinet based on improved thermal circuit model is proposed. The method can calculate the temperature of internal conductor by measuring the T type insulation sheath and the ambient temperature. A test platform is built for simulating the real running condition of T type connector in the ring network cabinet. The correctness of the thermal circuit model is verified by comparing the measured values with the calculated values. The results show that when the temperature field is in the steady state,the temperature relative error stays within 5. 4%. When the temperature field is in the transient state,the temperature relative error stays within 9. 0 %. The thermal circuit model can monitor the temperature of cable joints in real-time,the safe operation of the ring network cabinet and cable line can be ensured.