高海拔地区长隧洞高压进洞供电技术研究

Technologies of high-voltage power supply for long tunnel in high-altitude locality

随着隧洞进深加长,低压进洞不能满足施工要求,根据用电情况结合高海拔缺氧地区降效问题,研究高压进洞技术,确定变压器容量及电缆规格。实践证明,在距离洞口一定长度后,采用干式变压器进洞,解决了电压不足、电气设备无法启动等问题,确保了隧洞正常施工。详细介绍了高压进洞设计方法和相关技术措施,为类似工程提供设计和施工经验。

Low-voltage power supply cannot meet the requirement of tunneling along with deepening of tunnel excavation in high-altitude locality. Technologies of high-voltage power supply？for long tunnel are studied by taking the electricity utilization and potential deficiency as a result of high altitude into consideration, which helps to determine the transformer capacityand cable specification. When the tunnel gets longer and deeper, drytype transformer should be employed for？preventing under-voltage and failure of electrical equipment, in order to keep normal tunnel excavation. Design and technologies involved with high-voltage power entering into？tunnel are introduced in detail, which shall provide experiences for similar projects.