發(fā)布時間：2019-03-30 16:34

【摘要】：剩余電流保護器已在低壓配電網(wǎng)全面推廣應(yīng)用,但是由于其質(zhì)量、安裝及環(huán)境、管理困難等各方面因素,剩余電流保護器拒動、誤動還是經(jīng)常發(fā)生。因此電力企業(yè)提出建設(shè)剩余電流智能巡檢系統(tǒng),以加強對剩余電流保護器監(jiān)管力度,確保剩余電流保護器的可靠運行。智能巡檢系統(tǒng)一般由便攜式剩余電流保護器測試儀、剩余電流保護器后臺管理數(shù)據(jù)庫等模塊構(gòu)成。現(xiàn)場測試儀器識別剩余電流保護器的編號并且在線測量剩余電流保護器的動作特性參數(shù),測試數(shù)據(jù)自動存儲并遠傳至后臺數(shù)據(jù)庫,測試數(shù)據(jù)為剩余電流保護器運行狀態(tài)評價提供重要依據(jù)。目前電力系統(tǒng)廣泛開展電氣設(shè)備狀態(tài)維修的管理模式,本文針對配電網(wǎng)剩余電流保護器的運行狀態(tài)評價方法進行深入研究,對剩余電流保護器運行狀態(tài)進行評價并用于智能巡檢系統(tǒng)。實現(xiàn)剩余電流保護器狀態(tài)評價和預(yù)警,對于確保剩余電流保護器安全可靠運行,提高供電可靠性和安全用電具有重要意義。本文首先分析各類剩余電流保護器的結(jié)構(gòu)原理,三級剩余電流保護配置模式,不同接地系統(tǒng)中剩余電流保護器的接線方式,以及各種故障模式機理及產(chǎn)生的原因。在此基礎(chǔ)上,確定表征剩余電流保護器運行狀態(tài)的各個指標(biāo),包括動作電流、動作時間、試跳情況、環(huán)境氣候等。為了使求取的指標(biāo)權(quán)重更加貼近剩余電流保護器真實的運行狀態(tài),本文采用模糊層次分析法搭建層次分析評價體系,對各種狀態(tài)信息量進行兩兩分析比較,求得各個底層指標(biāo)元素的權(quán)重。最后提出了基于模糊綜合評價的剩余電流保護器綜合評價方法,該方法綜合考慮反映剩余電流保護器運行狀態(tài)的各種狀態(tài)信息,并建立合理的評價集,然后通過專家、工作人員等統(tǒng)籌狀態(tài)評價中主、客觀因素為每個指標(biāo)進行打分,再利用指派法確定每個評價集的隸屬度,然后根據(jù)最大隸屬度原則評價剩余電流保護器最終的狀態(tài)。最后,應(yīng)用案例表明該方法能有效評價剩余電流保護器的狀態(tài)。
[Abstract]:The residual current protector has been widely used in the low voltage distribution network. However, due to its quality, installation and environment, management difficulties and other factors, the residual current protector has refused to operate, and misoperation is still a frequent occurrence. In order to strengthen the supervision of the residual current protector and ensure the reliable operation of the residual current protector, the intelligent inspection system of the residual current is put forward by the electric power enterprise to strengthen the supervision of the residual current protector. Intelligent inspection system is usually composed of portable residual current protector tester, background management database of residual current protector and so on. The field testing instrument identifies the number of the residual current protector and on-line measures the operating characteristic parameters of the residual current protector, and automatically stores and transmits the test data to the background database. The test data provides an important basis for the evaluation of the operation state of the residual current protector. At present, the management mode of state-of-the-art maintenance of electrical equipment is widely carried out in power system. In this paper, the evaluation method of operating state of residual current protector in distribution network is studied deeply. The operating state of the residual current protector is evaluated and used in the intelligent inspection system. It is of great significance for ensuring the safe and reliable operation of the residual current protector and improving the reliability of power supply and safe use of electricity to realize the evaluation and early warning of the status of the residual current protector. This paper first analyzes the structure principle of all kinds of residual current protectors, the configuration mode of three-stage residual current protection, the connection mode of residual current protectors in different grounding systems, and the mechanism and causes of various fault modes. On the basis of this, each index of the operating state of the residual current protector is determined, including the operation current, the operation time, the trial jump condition, the environment climate and so on. In order to make the index weight more close to the real operation state of the residual current protector, this paper uses the fuzzy analytic hierarchy process (AHP) to set up the AHP evaluation system, and makes a pairwise analysis and comparison of the information quantity of various states. The weights of each underlying index element are obtained. Finally, a comprehensive evaluation method of residual current protector based on fuzzy comprehensive evaluation is proposed. The method considers all kinds of state information which reflect the operating state of residual current protector, and establishes a reasonable evaluation set, and then passes the experts, and then gives a comprehensive evaluation method of residual current protector based on fuzzy comprehensive evaluation. According to the principle of maximum membership degree, the final state of the residual current protector is evaluated according to the principle of maximum membership degree, then the membership degree of each evaluation set is determined by the assignment method, and the subjective and objective factors are graded for each index in the evaluation of the overall state of the staff and so on. Finally, the application case shows that the method can effectively evaluate the state of the residual current protector.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM774

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本文編號：2450274