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绝缘节是轨道电路赖以工作的关键部位,它的绝缘作用:一是划分区间分界点;二是保证轨道电路中的电流沿钢轨有方向地转输,通过车轮的分路检查区间的占用状态,以达到信号、联锁、闭塞设备的自动化控制的目的。由于绝缘节有这样重要的作用,所以电务和工务职工,不惜花费很大的精力维护保养,经常保持完好状态,真正起到绝缘钢轨的作用。一个大站电气集中,因为有调车作业,进路划分比较复杂,绝缘节的数量也比较多。一个有十股道,并有调车作业的车站,需装有200—250组绝缘节,占施工费的20％,占维修费的30％。
The insulation section is the key part of the track circuit to work, its insulation effect: First, the division of the demarcation interval; the second is to ensure that the track circuit current direction along the rail transit, the wheel of the shunt to check the occupancy of the interval , In order to achieve the purpose of automatic control of signals, interlocking and blocking devices. As the insulation section has such an important role, the electrician and the workers in the public service spare no effort to maintain and maintain the status quo at ordinary times, and really play the role of an insulated rail. Electrical concentration of a large station, because of shunting operations, the road is more complicated, the number of insulation section is also more. A station with ten roads and shunting operations shall be equipped with 200-250 groups of insulation sections, accounting for 20% of construction costs and 30% of maintenance costs.