本文選題：暫態(tài)行波 + 故障測距�。� 參考：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：輸配電線路作為電網(wǎng)骨架,對社會經(jīng)濟(jì)有著重大影響。為了保證線路故障后電能安全穩(wěn)定地輸送,應(yīng)快速準(zhǔn)確地確定故障點(diǎn)位置以便及時排除故障、恢復(fù)供電,由于我國配電網(wǎng)主要采用小電流接地系統(tǒng),因此對小電流接地系統(tǒng)單相接地故障測距的研究有重大意義。配電網(wǎng)結(jié)構(gòu)復(fù)雜,分支較多,相比雙端法,單端測距更具優(yōu)勢,因此本文以單端測距法作為基礎(chǔ)原理進(jìn)行研究。本文分析了單相接地故障時暫態(tài)行波的特征,通過相模變換獲取了行波的線模分量和零模分量。線模分量較穩(wěn)定,通常用作測距,然而零模分量中同樣包含故障信息,充分利用其特性可進(jìn)一步提高故障測距結(jié)果的準(zhǔn)確性。通過分析零模分量的傳輸特性可知,零模分量高頻部分波速比低頻更高,但衰減也更大,因此不同頻帶下的初始波速與反射波速有較大差異。零模分量波速隨故障距離增加而單調(diào)降低,因此反射波波速必小于初始波速�；诖颂卣骺蓪�(shí)現(xiàn)零模波速的估算,選取某一頻帶,該頻帶下的波速較為穩(wěn)定,零模初始波速與零模第一次反射波速最為接近,可將該頻帶的反射波速作為初始波速實(shí)現(xiàn)測距。由于波速存在衰減,基于模量傳輸時差的測距方法仍有一定誤差,因此可將其結(jié)果作為初步故障距離實(shí)現(xiàn)進(jìn)一步測距。利用初始故障距離小于實(shí)際故障距離這一特征減小波頭的搜尋范圍,通過故障點(diǎn)反射波頭與對端母線反射波頭到達(dá)時間的特定關(guān)系同時確認(rèn)兩個波頭,將對應(yīng)時間帶入測距公式得到更精確的故障距離。
[Abstract]:Transmission and distribution lines, as the backbone of the grid, have a great impact on the social economy. In order to ensure the safe and stable transmission of electric energy after line failure, the location of fault point should be determined quickly and accurately in order to troubleshoot the fault in time and restore the power supply. Since the distribution network of our country mainly adopts the small current grounding system, Therefore, it is of great significance to study the single-phase grounding fault location of low-current grounding system. The structure of distribution network is complex and there are many branches. Compared with two-terminal method, single-terminal ranging has more advantages. Therefore, the single-terminal ranging method is used as the basic principle in this paper. In this paper, the characteristics of transient traveling wave in single-phase grounding fault are analyzed, and the linear mode component and zero mode component of traveling wave are obtained by phase mode transformation. The linear mode component is more stable and is usually used for fault location. However, the zero-mode component also contains fault information, so the accuracy of fault location results can be further improved by making full use of its characteristics. By analyzing the transmission characteristics of the zero mode component, it can be seen that the high frequency partial wave velocity of the zero mode component is higher than that of the low frequency band, but the attenuation is also greater, so the initial wave velocity and the reflection wave velocity are different from each other in different frequency bands. The zero mode component wave velocity decreases monotonously with the increase of fault distance, so the reflected wave velocity must be less than the initial wave velocity. Based on this characteristic, the zero mode wave velocity can be estimated, and the wave velocity in a certain frequency band is relatively stable. The initial wave velocity of zero mode is the most close to the first reflected wave velocity of zero mode, and the reflected wave velocity of this frequency band can be used as the initial wave velocity to realize ranging. Due to the attenuation of wave velocity, there are still some errors in the ranging method based on Modulus transmission time difference, so the result can be used as the initial fault distance to realize the further location. By using the feature that the initial fault distance is smaller than the actual fault distance, the search range of the wave head is reduced, and the two wave heads are confirmed simultaneously by the specific relationship between the arrival time of the fault point reflection wave head and the opposite end bus reflection wave head. A more accurate fault distance is obtained by bringing the corresponding time into the range finding formula.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM755

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