The level value for environmental noise when calculating the necessary protective space of shortwave wireless receiver in the design of high voltage trolly wire was discussed .

本文就高压 架空 送 电 线路设计中， 按 实际 工程 情况计算短波无线电收信 台所需防护间距时，环境噪声电平取值问题进行了初步探讨。

Selection of electric circuitry of trolly wire and positioning electric pole

山区 架空电力线路的 路径选择和杆塔定位

Computer relay protection system and fiber - optic isolation detecting contral used in HV and large current of an electric railway trolly wire

电力铁路高压 直流 牵引 电网光纤隔离监控及计算机继电保护系统

Copper alloy which has high strength and high conductivity is a kind of important function material . And it is extensively applied to the down-lead frame of integrate circuit the head of resistance welding the trolly wire of electric engine and so on .

高强度高导电率铜作为一种重要的功能材料广泛应用于集成电路引线框架、电阻焊、电气机 车架 空线等。

With the need of the modern city development at present more and more the middle-low voltage power supply networks transport the electric power from trolly wire to electric power electric cable .

随着现代化城市建设的需求，目前，越来越多的中低压配电系统由 架 空线 转化 成电力电缆输送电能。