Multi-loop and unequal-section cable cluster laying method

Abstract

The invention provides a multi-loop and unequal-section cable cluster laying method. The method comprises the steps that the cable cluster laying mode, environment parameters and structural parameters and calculation parameters of cables in a cable cluster are obtained; a cable cluster carrying capacity optimized design mathematic model is established according to the cable cluster laying mode, the environment parameters and the structural parameters and the calculation parameters of the cables in the cable cluster; iteration is carried out through a barrier function, the cable cluster carrying capacity optimized design mathematic model is solved, and the cable cluster carrying capacity is obtained; whether laying of the multi-loop and unequal-section cable cluster is reasonable or not is judged according to the carrying capacity of the cable cluster, and if not, the cable cluster carrying capacity and / or arrangement are / is adjusted. Optimization from two aspects including the carrying capacity running optimization and line arrangement optimization can be achieved through the multi-loop and unequal-section cable cluster laying method. The dynamitic running load is more flexible and accurate. Meanwhile, the optimization result can serve as a cable dispatching running reference basis.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method for laying multi-circuit cables with unequal cross-sections. Background technique [0002] Underground cables are the main form of urban power transmission, and the cable ampacity is an important parameter in cable design and operation. If the cable load current is higher than the rated ampacity, the service life of the cable will be shortened, and the operational reliability will be reduced. Can not give full play to the transmission capacity of the cable. When the cable group is laid, in order to improve the transmission capacity of the cable and the utilization rate of the cable, the calculation of the cable ampacity is an important parameter. The optimization of the ampacity of the cable group is to adjust the cable current value (including adjusting the amplitude and phase), and to improve the cable utilization efficiency and reduce the cable loss under the...

AI Technical Summary

Problems solved by technology

Use the formula method to iteratively calculate the cable ampacity. When the number of cables is large, the iterative method to determine the cable ampacity is not accurate enough and the convergence is not good enough.

In addition, for multi-circuit cable groups of different types with different loads, it is very cumbersome to use the formula iterative method to calculate the ampacity, and it is necessary to constantly correct the value of the ampacity and check whether each cable exceeds the allowable value of the operating temperature.

[0004] In short, the existing methods are not accurate in calculating the ampacity of multiple circuits with different cross-section cables in non-standard laying cable systems, the calculation process is complicated and cumbersome, and has great limitations

Images