| 1. | Negative sequence inverse time overcurrent protection
负序反时限过流保护装置 |
| 2. | Microprocessor - based inverse time over - current protection algorithm
微机反时限过流保护算法 |
| 3. | Inverse time overcurrent relay
反时限过电继电器 |
| 4. | The algorithms of microprocessor distance protection emulated and calculated in this paper are used to realize the inverse time characteristic of microprocessor distance protection
本课题仿真计算的保护算法用于实现高压线路微机距离保护的反时限。微机距离保护是高压线路的重要保护之一。 |
| 5. | The principles of hardware and software for the protection of high - voltage electromotor in quick break , inverse - time - limit and single - phase grounding are discussed with a presentation on the eatablishment of the mathematics model
摘要阐述了微机对高压电机的速断、反时限以及单相接地保护的硬件和软件原理，并对其数学模型的建立进行了讨论。 |
| 6. | But routine electronic protector ca n ' t realize the protection for counter time limit , which is matching with the graph of heat over - loading protect . it can only realize " single point protection " and ca n ' t protect the failure happened during start - up
但是常规电子式保护器无法实现与电机热过载保护特性曲线相匹配的反时限特性保护，只能实现“单点式”保护，无法保护启动过程中出现的故障。 |
| 7. | Inverse - time overcurrent protection is used in power supply installation to fit the heat characteristic of the device ' s fault current . with reference to international standard characteristic equations , the equation by the integration of current term is suitable to describe the process of heat accumulation
将反时限过流保护的概念引入智能电源系统，参考国际通用反时限控制曲线，通过构造器件的热库模型采用微处理器程控能够方便实现各种反时限控制特性。 |
| 8. | Applying relative arithmetic to all kinds of faults and calculating off - line , we can master time - distance relation chart for all kinds of faults . computation indicates : when transmission lines occur faults , the data window of protection algorithm consisting of prefault and postfault data at the same time has important significance . the following methods are useful to achieve the inverse time characteristic : calculating impedance by using flourier in a full cycle , calculating work voltage by using fault component , calculating the torque created by a phase comparator or a magnitude comparator
实际的计算表明：输电线路发生故障后，用故障前后的数据同时充满保护算法的数据窗，对于快速切除近区故障具有很重要的意义；同时利用故障前后的数据，下述方法可以比较好地实现距离保护的反时限特性：直接用全周傅里叶算法进行阻抗计算；采用工频变化量阻抗继电器进行工作电压的计算；采用转矩的思想进行转矩的计算。 |
| 9. | So it is very important to investigate the inverse time characteristic of microprocessor distance protection . this paper emulates all kinds of faults of transmission lines by using emtp , and gets relative current and voltage sample values . then many distance protection thoughts and algorithms are adopted to compare each inverse time characteristic , better arithmetic and set thoughts are got
本论文应用emtp进行输电线路各种故障情况的仿真，采样取得保护相关的电压、电流数据；采用各种距离保护思想、算法，采用c语言进行计算，比较各自的时限特性，得出反时限特性比较好的算法及其整定思路；对于各种故障情况，应用相关整定思路进行离线计算，得出各种原理的时间距离特性。 |
| 10. | In the last part of this paper , a new control theory based on fuzzy neural network of substation voltage and reactive power synthetic control is presented . besides the guarantee of reactive power equilibrium and voltage quality , this theory can minimize the oltc tap _ changers " operation times . in order to avoid the frequent action of oltc tap _ changers caused by voltage fluctuation , inverse - time is introduced to this system that enhance the quality of voltage
最后将基于神经网络的模糊控制引入变电站电压无功综合控制策略，在保证无功基本平衡和电压合格的前提下，使oltc分接头的动作次数降至最低，并引入反时限概念，解决了因电压波动引起的频繁动作，最大限度的提高了电压合格率。 |
