真空断路器投切35kV并联电抗器的过电压仿真研究

发布时间：2018-03-06 19:28

本文选题：真空断路器　切入点：35kV并联电抗器　出处：《浙江大学》2014年硕士论文　论文类型：学位论文

【摘要】：真空断路器具有灭弧能力强、可靠性高、使用寿命长、无火灾危害、合适频繁操作等优点,在10及以下系统已经得到广泛的应用。近年来,真空断路器用于投切35kV并联电抗器的情况逐渐增多,然而根据实际运行经验,发生变电站内断路器相间绝缘击穿、母线压变高压熔丝熔断等过电压事故屡见不鲜,危害电力设备安全,影响电力系统的正常运行。这证明了现有的常规过电压装置保护效果不佳,对35kV系统使用真空断路器投切并联电抗器引起的过电压保护值得进一步研究。本文基于EMTP计算程序,以浙江省某220kV变电站为依托,仿真模拟了真空断路器投切35kV并联电抗器引起的过电压事故。根据故障录波图,分析了过电压的产生机理与条件,并进行了仿真复现。研究表明,截流效应是真空断路器投切时不可避免的,但截流值一般可以得到有效限制；复燃现象与真空断路器的触头材质、操作机构等有关,一般具有很大的随机性；三相同时开断过电压会引起较高的截流与电弧重复燃烧,在非首开相引起较高幅值的过电压,是引起较高过电压幅值的主要原因。基于仿真模型,本文还重点研究了目前的三种过电压过电压保护装置,分别进行了保护效果分析比较。结果显示,常规三星型避雷器与四星型避雷器对相对地过电压的保护效果相差不多,而四星型避雷器的相间过电压保护效果明显优于三星型避雷器。针对真空断路器投切并联电抗器引起的过电压,使用阻容吸收器的保护效果优于两种避雷器。接着本文比较了不同过电压保护安装方案下的过电压保护效果,结果显示母线侧同样需要安装过电压保护器以限制母线侧过电压。在第5章中还介绍了一种断路器末端投切保护方案,该方案以增设一台断路器为代价限制过电压,其优点在于增设断路器的方法简单,不必考虑安装过电压保护装置时过电压保护装置本身的安全与可靠性问题。最后本文对考虑远景时的雷击侵入波与铁磁谐振进行了概述。
[Abstract]:Vacuum circuit breaker with arc extinguishing capability, high reliability, long service life, no fire hazard, suitable for frequent operation and other advantages, and in 10 the following system has been widely used. In recent years, vacuum circuit breaker for switching 35kV shunt reactor situation gradually increased, but according to the actual operation experience, occurred in the substation circuit breaker and insulation breakdown, bus voltage transformer high-voltage fuse overvoltage accidents endangering the safety of power equipment, It is often seen., affecting the normal operation of power system. This proves that the existing conventional overvoltage protection device of poor effect, worthy of further research on overvoltage protection system using 35kV vacuum circuit breaker switching shunt reactor caused.
The calculation program based on EMTP, a 220kV substation in Zhejiang Province Based on the simulation of the vacuum breaker switching overvoltage accidents caused by cutting 35kV shunt reactor. According to the fault oscillograph, analyzed the voltage generating mechanism and conditions, and the simulation realization. It is indicated that the closure effect of vacuum breaker switching cut the inevitable, but the value of general closure can be effectively restrained; the contact material and the resurgence of the phenomenon of vacuum circuit breaker, operation mechanism and so on, has great randomness; at the same time the three-phase breaking overvoltage caused by high repetition and closure of arc burning, overvoltage caused by high amplitude in the first phase, is mainly caused by high voltage.
Based on the simulation model, this paper also focuses on the present three kinds of overvoltage protection devices, were carried out to compare the effect of protection. The results showed that the protective effect of conventional Samsung type lightning arrester and the four type arrester on relative overvoltage is similar, while the white four-star type lightning arrester overvoltage protection effect is better than Samsung type arrester. For over voltage of vacuum circuit breaker switching shunt reactor caused by the use of RC absorber protection is better than two. Then this paper compares the lightning arrester overvoltage protection effect overvoltage protection installation scheme. Results show that the bus side also need to install the overvoltage protector to limit bus side voltage. In the fifth chapter also introduces a kind of circuit breaker terminal switching protection scheme, the scheme for the creation of a circuit breaker limit overvoltage at the cost of the utility model has the advantages of increasing. The circuit breaker's method is simple. It doesn't need to consider the safety and reliability of overvoltage protection device when overvoltage protection device is installed. Finally, the paper summarizes the lightning invasion wave and Ferroresonance in the future.

【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM472

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