本文選題：真空斷路器　切入點：35kV并聯(lián)電抗器　出處：《浙江大學》2014年碩士論文　論文類型：學位論文

【摘要】：真空斷路器具有滅弧能力強、可靠性高、使用壽命長、無火災危害、合適頻繁操作等優(yōu)點,在10及以下系統(tǒng)已經(jīng)得到廣泛的應用。近年來,真空斷路器用于投切35kV并聯(lián)電抗器的情況逐漸增多,然而根據(jù)實際運行經(jīng)驗,發(fā)生變電站內(nèi)斷路器相間絕緣擊穿、母線壓變高壓熔絲熔斷等過電壓事故屢見不鮮,危害電力設備安全,影響電力系統(tǒng)的正常運行。這證明了現(xiàn)有的常規(guī)過電壓裝置保護效果不佳,對35kV系統(tǒng)使用真空斷路器投切并聯(lián)電抗器引起的過電壓保護值得進一步研究。 本文基于EMTP計算程序,以浙江省某220kV變電站為依托,仿真模擬了真空斷路器投切35kV并聯(lián)電抗器引起的過電壓事故。根據(jù)故障錄波圖,分析了過電壓的產(chǎn)生機理與條件,并進行了仿真復現(xiàn)。研究表明,截流效應是真空斷路器投切時不可避免的,但截流值一般可以得到有效限制；復燃現(xiàn)象與真空斷路器的觸頭材質(zhì)、操作機構(gòu)等有關,一般具有很大的隨機性；三相同時開斷過電壓會引起較高的截流與電弧重復燃燒,在非首開相引起較高幅值的過電壓,是引起較高過電壓幅值的主要原因。 基于仿真模型,本文還重點研究了目前的三種過電壓過電壓保護裝置,分別進行了保護效果分析比較。結(jié)果顯示,常規(guī)三星型避雷器與四星型避雷器對相對地過電壓的保護效果相差不多,而四星型避雷器的相間過電壓保護效果明顯優(yōu)于三星型避雷器。針對真空斷路器投切并聯(lián)電抗器引起的過電壓,使用阻容吸收器的保護效果優(yōu)于兩種避雷器。接著本文比較了不同過電壓保護安裝方案下的過電壓保護效果,結(jié)果顯示母線側(cè)同樣需要安裝過電壓保護器以限制母線側(cè)過電壓。在第5章中還介紹了一種斷路器末端投切保護方案,該方案以增設一臺斷路器為代價限制過電壓,其優(yōu)點在于增設斷路器的方法簡單,不必考慮安裝過電壓保護裝置時過電壓保護裝置本身的安全與可靠性問題。最后本文對考慮遠景時的雷擊侵入波與鐵磁諧振進行了概述。
[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.

【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM472

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本文編號：1576164