多回并列直埋电缆热特性的影响因素分析

多回并列敷设电缆的热阻特性是影响直埋电缆输送能力的重要因素,而其热阻特性又与电缆的敷设方式或布局结构显著相关.以土壤中直埋的XLPE电力电缆为例,探索了多回并列敷设电缆的回数和层数、布置方式、回间距等对电缆热特性的影响,并据此找出了优化的敷设方式,为实际的电缆敷设施工提供了理论依据.研究结果表明,土壤中直埋电缆应尽量采用单层布置,最好不超过2层,回间净距以不小于2倍单回外径为好.

Influencing factors of thermal characteristics of multiloop paratactic buried cables

Thermal resistance characteristics strongly influence the current-carrying capacity of power cable in multiloop paratactic systemoflaying,while the thermal resistance of cable is closely related with its laying method or structure significantly.Based on the example of XLPE power cables buried in soil,this paper deeply studies the relationship between multicircuit power cable thermal resistance characteristics and its influencing factors such as their layout structure,circuit number,layers,gap distance,etc.And then the optimal systemoflaying is found,which provides a theoretical basis for the actual cable laying construction.So far as buried cables is concerned,the better systemoflaying can be summarized as follows:It would be best to take use of single-layer arrangement;two layers should not be exceeded;and the clear distance between them would be best if it is not less than twice larger than outer diameter of single circuit.