需要金幣： 1000 個(gè)金幣 |
資料包括：完整論文 |  |
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| 轉(zhuǎn)換比率：金額 X 10=金幣數(shù)量， 例100元=1000金幣 | 論文字?jǐn)?shù)：12398 |  | |
| 折扣與優(yōu)惠：團(tuán)購(gòu)最低可5折優(yōu)惠 - 了解詳情 | 論文格式：Word格式(*.doc) |  |
摘要:變壓器利用電磁感應(yīng)原理把一種電壓的交流電能轉(zhuǎn)變?yōu)轭l率相同的另一種電壓的交流電能，在電力系統(tǒng)中，需要用變壓器將電壓升級(jí)進(jìn)行遠(yuǎn)距離傳輸，以降低線路損耗，當(dāng)電能到達(dá)用戶區(qū)后，再采用不同等級(jí)的變壓器將電能降壓使用。因此，變壓器的正常運(yùn)行對(duì)保持系統(tǒng)的穩(wěn)定性與安全有著特殊的意義。本課題利用MATLAB/SIMULINK軟件，設(shè)計(jì)一個(gè)變壓器差動(dòng)保護(hù)仿真系統(tǒng)，通過仿真來驗(yàn)證差動(dòng)保護(hù)正確性和合理性。實(shí)施縱差動(dòng)保護(hù)要解決好以下幾個(gè)問題：如何正確識(shí)別勵(lì)磁涌流和短路電流；解決好躲開區(qū)外短路故障時(shí)差動(dòng)回路中的不平衡電流和保護(hù)靈敏度間的矛盾；外部短路故障切除電壓恢復(fù)的暫態(tài)過程中，保證差動(dòng)保護(hù)不誤動(dòng)作；電流互感器飽和不應(yīng)影響縱差動(dòng)保護(hù)正確動(dòng)作等問題。 關(guān)鍵詞 縱差動(dòng)保護(hù)；SIMULINK；仿真；躲開故障
Abstract:Transformer using the principle of electromagnetic induction to a voltage alternating current can change another voltage of the same frequency of the AC power, in the power system, need to use the transformer voltage upgrade for long-distance transmission, in order to reduce the loss of line, when the energy reaches the user area, then the different level of transformer power step-down use, therefore, the normal operation of the transformer has a special meaning for maintaining stability and security system. This topic using MATLAB/SIMULINK software, the design of a transformer differential protection simulation system, the simulation to verify the correctness and rationality of the differential protection. The implementation of differential protection to solve the following problems: how to correctly identify the inrush current and short circuit current; solve from external short-circuit fault time difference between loop of the unbalanced current and the transient protection sensitivity; external fault with voltage recovery, assurance of differential protection misoperation; current transformer saturation should not affect the correct operation of differential protection. Keywords Longitudinal differential protection Simulink Simulation Avoid fault |
