传统保护存在后备保护动作时间过长和不能区分线路过载与故障等不足。
The traditional protection has some shortcomings: long operation time of backup protection, not distinguishing overload from fault of line and so on.
多普勒负反应性反馈效应能在保护动作延迟的时间内将功率限制在可接受的水平。
The negative Doppler effect will limits the power to an acceptable level during the time delay for protective action.
对它们使用的特点，如动作时间、保护范围和通流能力等进行了分析和比较。
The operating characteristics of these methods such as response time, scope of protection and capability of current are analysed and compared with.
其基本保护采用零序过电压保护，动作时间采用反时限特性；
The inverse time delay characteristic is adopted by the basic zero-sequence over-voltage protection.
实验结果表明，动作时间及电流动作值精度在2%以内，保护装置运行稳定可靠。
Test results show that time duration and current operating value precision are less than 2%, and the functions of the protection device are reliable.
本文的目的在于论述与安全有关的漏电保护的两个参数——动作电阻值和动作时间。
This paper is to demonstrate two parameters of earth-leakage protection relevant to safety-value of operating resistance and operating time.
本文的目的在于论述与安全有关的漏电保护的两个参数——动作电阻值和动作时间。
This paper is to demonstrate two parameters of earth-leakage protection relevant to safety-value of operating resistance and operating time.
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