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在电力电缆、橡套电缆和矿用电缆的结构计算中,经常碰到两个主线加一个地线或者三个主线加一个地线的结构形式,即我们通常称作的二大一小和三大一小.对二大一小的结构,虽然在新标准中取消了,但在新产品设计和计算时仍遇到这种形式的产品.因此,正确地计算这些结构参数,就显得特别需要了.尤其对于三大一小的结构形式在橡套电缆和矿用电缆中是大量使用的.正确地计算这些参数,对确定电缆的结构、计算材料使用量都具有现实的意义.
Structural calculation of power cables, rubber cables and mining cables, often encounter two main plus a ground or three main plus a ground structure, that is, we usually called the two big one small and three Although the two smaller structures, which were eliminated from the new standard, still encounter this form of product design and calculation of new products, it is particularly necessary to calculate these structural parameters correctly Especially for the three major and minor structural forms in the rubber cables and mining cables is widely used.Calculating these parameters correctly, to determine the structure of the cable, calculate the material usage has a realistic meaning.