浅谈卡鲁玛尾水隧洞项目10kV高压进洞方法

Discussion on 10 kV High Voltage Tunnel Entry Method for Karuma Tailrace Tunnel Project

乌干达卡鲁玛水电站尾水隧洞划分为8号、9号、尾水三个支洞施工段分区施工,施工过程中隧洞内使用电气设备有混凝土地泵车、多臂钻机、水泵排水系统、通风机以及照明和施工使用的各类小型电动工具,由于作业面距离洞口较远,电气设备功率较大,必须把10 kV高压引入洞内降压为400 V才能满足电气设备的使用。因此如何选用适应的10 kV配电设备,电气材料,保障合格的电力电源以及配电系统的安全运行,笔者以8号支洞施工区为例,阐述了选用原则和计算方法,可供类似工程参考借鉴。

The tailrace tunnel of Karuma Hydropower Station in Uganda is divided into three branch tunnel construction sections:N0.8 and No.9,and the tailrace.During the construction process,the electrical equipment used in the tunnel includes concrete pump trucks,multi-arm drilling machines,water pump drainage systems,ventilators,lighting and various types of small power tools used in construction.Due to the far distance between the working face and the tunnel opening and the high power of electrical equipment,it is necessary to introduce l0 kV high voltage into the tunnel and reduce the voltage to 400 V to meet the use of electrical equipment.Therefore,how to choose suitable l0 kV distribution equipment,electrical materials,ensure qualified power supply and safe operation of safe operation of the distribution system.This article takes the construction area of the No.8 adit as an example to organize the selection principles and calculation methods,which can provide reference for similar projects.