需要金幣： 1000 個金幣 |
資料包括：完整論文 |  |
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| 轉換比率：金額 X 10=金幣數(shù)量， 例100元=1000金幣 | 論文字數(shù)：7824 |  | |
| 折扣與優(yōu)惠：團購最低可5折優(yōu)惠 - 了解詳情 | 論文格式：Word格式(*.doc) |  |
摘要:本篇論文主要描述的是針對區(qū)域電網(wǎng)所產(chǎn)生的不對稱短路故障的分析及為避免故障所安裝的保護措施，即線路的三段式電流保護。及故障的排除的方法。 根據(jù)對稱分量的基本原理，即是將整個網(wǎng)絡分解為正序網(wǎng)絡、負序網(wǎng)絡、零序網(wǎng)絡三個對稱序網(wǎng)，再利用線性電路的疊加原理，對這三組對稱分量分別按對稱三相電路進行求解，然后將其結果進行疊加。其過程需要將各序網(wǎng)絡圖分別進行化簡，通過化簡結果計算三種不對稱短路故障的電流，并根據(jù)其電流對線路進行三段式電流保護的計算（即：電流速斷保護、限時電流速斷保護、定時限過電流保護），包括其整定和校驗。本設計主要選取了5個短路點，分別選取在線路L5，L6的兩側及變壓器T7和T8的兩側，并對其進行正序、負序、零序網(wǎng)絡的化簡，并對線路進行相應的保護計算。 通過對電力系統(tǒng)的了解，應在系統(tǒng)線路上裝設線路保護裝置，使其滿足校驗的條件。當電力系統(tǒng)發(fā)生短路故障時，根據(jù)不同不對稱短路故障的特點，能夠選擇合適的電力線路檢查的方法，并及時快速的檢查計算出短路故障點的地點及短路類型。根據(jù)短路情況，運用相應的方法對短路故障進行解除。 關鍵詞：不對稱網(wǎng)絡；短路故障；故障排除
ABSTRACT:This paper mainly describes the regional power grid generated by asymmetric fault analysis and in order to avoid failure of the installation of protective measures, that line the three-section current protection. And trouble shooting method. According to the basic principle of symmetrical components, that is, the entire network into network network of positive sequence, negative sequence and zero sequence three symmetric sequence network network, and then using the superposition principle for linear circuits, on the three sets of symmetrical components to solve breakdowns on the symmetrical three-phase circuit and its result stack. Process the sequence needs to be to simplify network respectively, by simplifying the results calculated three asymmetrical short-circuit fault current, and lines based on their current calculation of three-section current protection (that is, current fast-tripping protection time limits, limited to current fast-tripping protection, over current protection), including its tuning and calibration. Choose 5 main characteristics of the design, choose line L5,L6, respectively on either side and T7 and T8 on either side of the transformer, and make positive sequence, negative sequence and zero sequence network simplification and appropriate protection for line calculation. Through the understanding of power systems, installation of transmission line protection device on the line, to meet a validation condition. When the power system short-circuit fault occurs, depending on asymmetrical short-circuit fault characteristics, ability to select appropriate methods for checking of electrical wiring, and quick check in time to calculate the short circuit short circuit type and location of the point of failure. Under short circuit conditions, use the appropriate method to lift the fault. Key words: asymmetric network fault; troubleshooting |
