随着电力系统网络规模的不断扩大和电压等级的不断提高，对故障选相装置的要求也不断提高。
Along with the continuous development of power system network and the continuous enhancement of voltage grade, the request is enhanced correspondingly to the fault phase selector.
随着电力设备电压等级的提高，人们对电力设备运行可靠性提出了更加苛刻的要求。
As increasing voltage grade of power electrical equipment, it is much more rigorous for the reliability of these equipment.
城市配电网因为其电压等级较低，为了提高系统供电的可靠性，曾广泛采用中性点不接地系统方式。
In distributions, because of its low-level voltage, its neutral point used to disconnect to the ground in order to improve its reliability.
提高配电网电压等级是提升城市电网供电能力的有效途径。
To lift the voltage level of distribution network is an effective method to enlarge the power supply capacity of the urban network.
电网规模的扩大、输电电压等级的提高，使得继电保护在电力系统中的地位变得更加重要。
With the expansion of power grid and the increase of the transmission voltage grade, the status of relay protection in power system is becoming more and more important.
本文就地面供电电压等级由380v提高到660v电压技术问题进行探讨。
The paper discusses the technique of increasing surface power voltage class from 380v to 660v.
随着电压等级的提高及线路结构的变化，输电线路雷击跳闸率计算法也不断地改进。
With being higher the voltage and varying of transmission line structure, the calculation method of lighting trip-out rates should be improved continually.
随着电力系统电压等级的提高、设备容量的增大，对系统安全性、稳定性的要求也越来越高。
With the increase of rated voltage and capacity of power equipment, higher reliability of power system is expected.
目前，由于系统的电网等级不断提高，操作过电压也随之不断升高，这对电气设备的正常运行造成很大的危害。
The switching over-voltage is rising in pace with the raise of the power system grade, which is very harmful to the electrical equipment in the network.
该技术可广泛应用于电压源、电流源或高等级测试系统的设计中，大大提高系统的准确度及产品生产的自动化。
The technology is extensive used for the source or high accuracy measuring and test instrument. It can greatly improve the accuracy, and greatly improves the automation for instrument production.
随着远距离输电线路电压等级的提高，大型电站中的操作过电压威胁着大型发电机的绝缘安全。
With the increment of working voltage for the long-distance transmission line, the switching overvoltage in large power stations is threatening the insulation safety of large generators.
随着电网电压等级的提高，电缆的电树枝老化问题愈显突出。
As to higher voltage rating polymer cables, electrical tree aging problem is more outstanding.
随着电网电压等级的提高，电缆的电树枝老化问题愈显突出。
As to higher voltage rating polymer cables, electrical tree aging problem is more outstanding.
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