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Although the first thesis on Ferroresonance was published in 1920, FR is still not a fully understood phenomenon. This thesis focuses on single phase FR in Gas Insulated Switchgearwith inductive potential transformers, fed by the circuit breaker grading capacitance. In principle, FR is a forced oscillation in a non-linear series resonance circuit including a capacitance and non-linear inductance, which shows significantly distorted voltage and current waveforms.

中文摘要虽然第一篇有关铁磁共振（Ferroresonance，简称FR）的文献早在1920年即被发表，但是此一特殊的现象至今仍然未被完全了解，本论文将讨论电力系统中之气封绝缘开关设备（Gas Insulated Switchgear，简称GIS），由於断路器的极间电容和电感型比压器（Potential Transformer，简称PT）的非线性电感所构成的单相铁磁共振；理论上，铁磁共振是由电容和非线性电感所构成的非线性串联共振，造成电压和电流波形明显的畸变。

In this thesis, soft starter equipment realized by thyristors power transform circuit is studied. To improve equipment performance, we apply variable reactance technique to AC motor soft starter study. The high voltage AC working winding of reactance is in series with motor winding, while low voltage control winding and thyristors groupware with intelligent controller constitute close loop circuit. We adopt thyristor phase control voltage-regulator mode to control low voltage winding, then control the reactance of high voltage winding, and then arrive at the goal-control the current and voltage of motor AC to realize motor soft starting.

本文研究由晶闸管功率变换电路实现的软起动器装置，为了提高装置的性能，将可变电抗技术应用于交流电机软起动研究中，电抗器的高压交流工作绕组与电动机绕组串接，低压控制绕组与带智能控制器的晶闸管组件组成闭合回路，采用晶闸管相控方式控制低压绕组，从而控制高压绕组的阻抗，以达到对电机电流与电压的控制，最终实现电机软起动的目的。

A type of short circuit protection circuit.

一种短路保护电路。

Can be used for the calculation of power system symmetrical short-circuit short-circuit calculation.

详细说明：可以用来进行电力系统短路计算中对称短路计算。

This paper also discusses how to select the appropriate circuit parameters according to short-circuit current margin.

分析了短路故障时的电路工况，并讨论了如何根据短路电流裕量来选择合适的电路参数。

During the hardware circuit design, the signal conditioning circuit and the DAQ card is important to whole system's accuracy.

在硬件电路设计中，信号调理电路和数据采集卡是整个系统测量精度的关键环节。

During the hardware circuit design, the signal conditioning circuit and the DAQ card isimportant to whole system's accuracy.

在硬件电路设计中，信号调理电路和数据采集卡是整个系统测量精度的关键环节。

The signal conditioning circuit and digital circuit are illustrated.

文中介绍了信号调理电路和数字化电路的组成。

Control circuit using PLC control, so that the circuit is simple and easy maintenance.

控制电路采用PLC控制，使到电路简洁，维修方便。

This paper designs hardware of a single-phase bridge medium-frequency inverter including of main circuit and control circuit.

介绍了单相全桥式逆变的400Hz中频电源主电路设计以及基于80C196MC的控制电路设计。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。