Abstract
The reliability and service life of power cables is closely related to the cable ampacity and temperature rise. Therefore, studying the temperature field distribution and the cable ampacity is helpful to improve the construction guidelines of cable manufacturers. Taking a 8.7/15 kV YJV 1 × 400 XLPE three-loop power cable as the research object, cable temperature is calculated by IEC-60287 thermal circuit method and numerical simulation method, respectively. The results show that the numerical simulation method is more in line with the actual measured temperature, and the relative error is only 0.32% compared with the actual measured temperature. The temperature field and air velocity field of cluster cables with different laying methods are analyzed by finite element method. The corresponding cable ampacity are calculated by secant method. The results show that when the cable is laid at the bottom of the cable trench, the cable current is 420 A, which is 87.5% of the regular laying. Under irregular laying mode, the temperature of cable is higher than that of regular laying mode and the cable ampacity is lower than that of regular laying mode. At the same time, a multiparameter online monitoring system is developed to online monitor the temperature, water level and smoke concentration of the cable.
Highlights
Due to mechanical damage, contact resistance of cable joint, overcurrent operation, and so on, the temperature rise of the cable exceeds the rated value, which leads to electric shock or fire, and threatens the safety of the power grid
It is necessary to simulate the distribution of temperature field and calculate cable ampacity and online monitor the temperature of cables
It can be seen that the hottest part of the cable trench is around each cable group, and the hottest spot (310.28 K) appears at the core of the first layer cable
Summary
Contact resistance of cable joint, overcurrent operation, and so on, the temperature rise of the cable exceeds the rated value, which leads to electric shock or fire, and threatens the safety of the power grid. It is necessary to simulate the distribution of temperature field and calculate cable ampacity and online monitor the temperature of cables. There are two main calculation methods for cable temperature and ampacity: one is the analytical method obeying IEC-60287 standard [1,2]. This method is suitable for direct buried cables. IEC standard makes many ideal assumptions for the calculation of the cable ampacity and temperature distribution. Compared with the analytical method, the numerical analysis method has many advantages, such as stronger operational adaptability with multiphysical field coupling analysis and simulation data is more accurate. In recent years, numerical calculation method [4,5] has become a good tool to study cable thermal problems
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