本文選題：零序電流互感器 + 零序保護�。� 參考：《華南理工大學》2014年碩士論文

【摘要】：隨著東莞市城市的發(fā)展，東莞電網(wǎng)加速進行城網(wǎng)改造，大部分配網(wǎng)將逐步以電纜線路取代架空線路，電網(wǎng)結(jié)構(gòu)也將由單電源、輻射形供電發(fā)展為多電源環(huán)形供電，以提高供電可靠性。中性點經(jīng)小電阻接地方式配置簡單、動作迅速，更適應(yīng)于大中城市以電纜出線為主的配電網(wǎng)絡(luò)。然而相對于中性點消弧線圈接地方式，10kV配電網(wǎng)采用中性點經(jīng)小電阻接地方式在我國投入運行時間不長，許多問題尚有待深入研究。 據(jù)統(tǒng)計，目前東莞電網(wǎng)中曾發(fā)生過多起由于二次設(shè)備失常引發(fā)的問題，其中既包含零序電流互感器選型、安裝的問題又包含零序電流互感器檢測、維護的問題。零序電流互感器作為系統(tǒng)核心部件之一，對保護、測量裝置至關(guān)重要，其合理選用和運行將極大提高電網(wǎng)安全性和可靠性。因此，對零序電流互感器進行系統(tǒng)研究，對選型、安裝方面存在的問題進行排查，對運行、維護方面的措施進行升級改善，將能有效提高東莞電網(wǎng)的運行效益，，更有助于國內(nèi)配電網(wǎng)建設(shè)與運行的經(jīng)驗積累。 本論文首先從理論上分析了電流互感器的工作原理及特性，剖析其誤差構(gòu)成及原因，介紹了電流互感器的型號及其指標含義，并對電流互感器進行分類歸納，列舉保護用電流互感器的精度及選型要求。在此基礎(chǔ)上，闡述了零序電流互感器有別于一般電流互感器的特殊之處，展示了常用的零序電流互感器型號和種類，分析了零序電流互感器在線路零序保護、變壓器零序保護、發(fā)電機零序保護、小接地系統(tǒng)故障選線、漏電保護等系統(tǒng)中的應(yīng)用方式和工作原理。從工程實用的角度，歸納了對零序TA在各主要指標方面的選取原則和要求，對零序TA的安裝要求和注意點進行了說明，對零序TA在運行維護進行了介紹。本文重點對東莞供電局一例10kV主變保護越級跳閘案例進行了回顧分析，發(fā)現(xiàn)一種導致零序保護拒動的零序TA的典型錯誤接法，并制定了該類零序TA的改進安裝工藝。針對東莞供電局對中低壓零序TA升流試驗作業(yè)中存在的不足，提出一種加裝了零序TA升流線的創(chuàng)新性升流試驗法，明顯提高了作業(yè)效率和安全系數(shù)。
[Abstract]:With the development of Dongguan city, Dongguan power grid will accelerate the urban network transformation. Most distribution networks will replace overhead lines with cable lines gradually. The power network structure will also be developed from single power supply, radiation power supply to multi-power ring power supply. To improve the reliability of power supply. The neutral point is easy to be configured through the small resistance grounding mode, and it is more suitable for the distribution network with cable outlet in large and medium cities. However, compared with the neutral arc-suppression coil grounding mode, it is not long for 10kV distribution network to use the neutral grounding method with small resistance, and many problems need to be studied deeply. According to statistics, there have been many problems caused by secondary equipment aberrations in Dongguan power grid at present, including the selection of zero-sequence current transformers, the problems of installation and the problems of detection and maintenance of zero-sequence current transformers. As one of the core components of the system, the zero-sequence current transformer is very important to the protection and measurement device. Its reasonable selection and operation will greatly improve the security and reliability of the power network. Therefore, the system research on zero sequence current transformer, the problems in selection and installation, the upgrading and improvement of operation and maintenance measures will effectively improve the operation efficiency of Dongguan power network. More conducive to domestic distribution network construction and operation of the accumulation of experience. In this paper, the working principle and characteristic of current transformer are analyzed theoretically, the error structure and reason are analyzed, the model of current transformer and its index meaning are introduced, and the current transformer is classified and summarized. The accuracy and selection requirements of current transformers for protection are listed. On this basis, the special features of zero-sequence current transformer are expounded, and the types and types of zero-sequence current transformer in common use are shown. The zero-sequence current transformer is analyzed in line zero-sequence protection and transformer zero-sequence protection. The application mode and working principle of generator zero sequence protection, fault line selection of small grounding system, leakage protection and so on. From the point of view of engineering practice, the selection principles and requirements of zero sequence TA in each main index are summarized, the installation requirements and attention points of zero sequence TA are explained, and the operation and maintenance of zero sequence TA are introduced. In this paper, a case of 10kV main transformer protection overstep tripping in Dongguan Power supply Bureau is reviewed and analyzed. It is found that a typical misconnection method of zero-sequence TA, which leads to zero sequence protection rejection, is found, and the improved installation technology of this kind of zero-sequence TA is established. In view of the shortcomings of Dongguan Power supply Bureau in the operation of low and medium voltage zero sequence TA upflow test, an innovative up-current test method with zero sequence TA upflow line is put forward, which obviously improves the working efficiency and safety factor.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM452

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