配電變壓器繞組故障在線診斷方法研究
發(fā)布時間：2018-07-13 11:49
【摘要】：配電變壓器在配電系統(tǒng)中承擔著電壓變換、電能分配的重要任務(wù)，其安全可靠運行對保障配電系統(tǒng)的穩(wěn)定運行具有重大意義。配電網(wǎng)的規(guī)劃、建設(shè)和發(fā)展現(xiàn)狀，導(dǎo)致配電變壓器運行環(huán)境惡劣、變壓器事故頻發(fā)，且配電變壓器的檢修以計劃檢修為主，影響配電網(wǎng)的電能質(zhì)量和供電可靠性，因此配電系統(tǒng)需要一種適合配電變壓器狀態(tài)檢修的繞組故障在線診斷方法。由于現(xiàn)有的變壓器繞組故障在線診斷方法不適合配電變壓器繞組故障診斷且配電變壓器繞組故障診斷缺少診斷依據(jù)及量化標準，因此本文正向計算繞組故障時變壓器內(nèi)部電磁參數(shù)及繞組末端電流和等效短路阻抗，建立繞組故障診斷依據(jù)及量化標準，并通過繞組末端電流電壓信號計算繞組短路阻抗逆向診斷繞組故障的研究具有重要的意義。 本文在配電變壓器繞組故障調(diào)查及變壓器參數(shù)模型的基礎(chǔ)上，基于有限元方法建立配電變壓器的靜磁場和場路耦合瞬態(tài)磁場的模型，利用ANSOFT軟件正向分析計算配電變壓器的繞組短路、繞組絕緣老化及繞組變形故障時變壓器漏磁場的分布、繞組電動力及繞組電流和等效短路阻抗，為配電變壓器繞組故障診斷提供依據(jù)和量化標準。建立了基于繞組末端電壓和電流信號計算變壓器繞組短路阻抗逆向診斷繞組故障的在線診斷系統(tǒng)，并通過變壓器吊罩檢查，驗證繞組故障診斷系統(tǒng)的準確性。本文的主要工作內(nèi)容如下： ①簡述配電變壓器繞組故障診斷背景及意義，闡述變壓器參數(shù)模型及繞組故障診斷研究現(xiàn)狀，確定變壓器繞組故障診斷方法，調(diào)查配電變壓器繞組故障種類及產(chǎn)生原因。 ②基于有限元理論建立變壓器靜磁場及場路耦合瞬態(tài)磁場模型。靜磁場模型用于計算變壓器空載、額定負載、外部短路時變壓器漏磁場分布及繞組電動力。場路耦合瞬態(tài)磁場模型用于計算繞組故障時變壓器內(nèi)部電磁參數(shù)和繞組電動力，繞組末端的電流及等效短路阻抗，并用短路試驗計算驗證場路耦合瞬態(tài)模型的正確性。 ③建立配電變壓器繞組匝間短路和繞組對地短路的場路耦合繞組故障模型，正向計算短路故障前后變壓器漏磁場分布、繞組電動力、繞組末端電流和等效短路阻抗，為繞組短路故障診斷提供依據(jù)和量化標準。 ④建立配電變壓器繞組軸向位移變形及繞組絕緣介質(zhì)老化的場路耦合故障模型，正向計算繞組故障時變壓器漏磁場分布、繞組電動力、繞組末端電流和繞組等效短路阻抗，，為繞組潛在故障在線診斷提供依據(jù)和量化標準。 ⑤建立通過繞組末端電流電壓參數(shù)計算繞組短路阻抗逆向診斷繞組故障的在線診斷系統(tǒng)，并建立實驗平臺，驗證在線測量繞組短路阻抗的準確性及進行誤差分析。 ⑥建立配電變壓器繞組故障在線診斷平臺，通過在線繞組短路阻抗測量及變壓器吊罩繞組檢查，確定變壓器繞組故障在線診斷方法的準確性。
[Abstract]:Distribution transformer takes on the important task of voltage conversion and power distribution in the distribution system. Its safe and reliable operation is of great significance to ensure the stable operation of the distribution system. The planning, construction and development of distribution network lead to the poor operating environment of distribution transformer, frequent accidents of transformer, and the maintenance of distribution transformer is mainly based on planned maintenance, which affects the power quality and reliability of distribution network. Therefore, distribution system needs a method of winding fault on-line diagnosis suitable for condition maintenance of distribution transformer. The existing on-line diagnosis methods of transformer winding fault are not suitable for distribution transformer winding fault diagnosis and the fault diagnosis of distribution transformer winding lacks diagnostic basis and quantification standard. Therefore, in this paper, the inner electromagnetic parameters and the end current and equivalent short circuit impedance of the transformer are calculated forward, and the diagnostic basis and quantification standard of the winding fault are established. It is of great significance to calculate the winding short circuit impedance by using the winding terminal current and voltage signal to diagnose the winding fault. Based on the fault investigation of distribution transformer windings and the transformer parameter model, the model of static magnetic field and field-circuit coupled transient magnetic field of distribution transformer is established based on finite element method in this paper. The distribution of magnetic leakage magnetic field, winding electric force, winding current and equivalent short circuit impedance of distribution transformer are calculated by ANSOFT software when winding short circuit, winding insulation aging and winding deformation fault are analyzed. It provides basis and quantification standard for winding fault diagnosis of distribution transformer. An on-line fault diagnosis system based on winding terminal voltage and current signals for reverse diagnosis of transformer winding short-circuit impedance is established. The accuracy of winding fault diagnosis system is verified by transformer hood inspection. The main work of this paper is as follows: 1. The background and significance of winding fault diagnosis of distribution transformer are briefly described. The transformer parameter model and the status quo of winding fault diagnosis are described, and the fault diagnosis method of transformer winding is determined. Based on the finite element theory, the transient magnetic field model of transformer coupled with static magnetic field and field circuit is established. The static magnetic field model is used to calculate the leakage magnetic field distribution and the electric force of the winding when the transformer has no load, rated load and external short circuit. The field circuit coupled transient magnetic field model is used to calculate the internal electromagnetic parameters of the transformer, the electrodynamic force of the winding, the current at the end of the winding and the equivalent short circuit impedance. The correctness of the field-circuit coupling transient model is verified by short-circuit test. (3) the fault model of the field-circuit coupling winding is established for the inter-turn short circuit of the winding of distribution transformer and the short-circuit of the winding to the ground. Forward calculation of transformer leakage magnetic field distribution, winding electromotive force, winding end current and equivalent short circuit impedance before and after short-circuit fault, This paper provides the basis and quantification standard for fault diagnosis of short circuit winding. 4. The field circuit coupling fault model of axial displacement deformation of distribution transformer winding and aging of insulation medium of winding is established, and the leakage magnetic field distribution of transformer when winding fault is calculated in the forward direction. Winding electromotive force, winding end current and winding equivalent short circuit impedance, This paper provides the basis and quantification standard for on-line diagnosis of potential winding faults. 5. An on-line diagnosis system for the reverse diagnosis of winding fault by calculating winding short-circuit impedance through winding terminal current and voltage parameters is established, and an experimental platform is established. To verify the accuracy of on-line measurement of winding short-circuit impedance and to analyze the error. (6) the on-line fault diagnosis platform of distribution transformer windings is established, and the on-line winding short-circuit impedance measurement and transformer hoisting winding inspection are carried out. The accuracy of on-line diagnosis method of transformer winding fault is determined.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM421
本文編號：2119273
[Abstract]:Distribution transformer takes on the important task of voltage conversion and power distribution in the distribution system. Its safe and reliable operation is of great significance to ensure the stable operation of the distribution system. The planning, construction and development of distribution network lead to the poor operating environment of distribution transformer, frequent accidents of transformer, and the maintenance of distribution transformer is mainly based on planned maintenance, which affects the power quality and reliability of distribution network. Therefore, distribution system needs a method of winding fault on-line diagnosis suitable for condition maintenance of distribution transformer. The existing on-line diagnosis methods of transformer winding fault are not suitable for distribution transformer winding fault diagnosis and the fault diagnosis of distribution transformer winding lacks diagnostic basis and quantification standard. Therefore, in this paper, the inner electromagnetic parameters and the end current and equivalent short circuit impedance of the transformer are calculated forward, and the diagnostic basis and quantification standard of the winding fault are established. It is of great significance to calculate the winding short circuit impedance by using the winding terminal current and voltage signal to diagnose the winding fault. Based on the fault investigation of distribution transformer windings and the transformer parameter model, the model of static magnetic field and field-circuit coupled transient magnetic field of distribution transformer is established based on finite element method in this paper. The distribution of magnetic leakage magnetic field, winding electric force, winding current and equivalent short circuit impedance of distribution transformer are calculated by ANSOFT software when winding short circuit, winding insulation aging and winding deformation fault are analyzed. It provides basis and quantification standard for winding fault diagnosis of distribution transformer. An on-line fault diagnosis system based on winding terminal voltage and current signals for reverse diagnosis of transformer winding short-circuit impedance is established. The accuracy of winding fault diagnosis system is verified by transformer hood inspection. The main work of this paper is as follows: 1. The background and significance of winding fault diagnosis of distribution transformer are briefly described. The transformer parameter model and the status quo of winding fault diagnosis are described, and the fault diagnosis method of transformer winding is determined. Based on the finite element theory, the transient magnetic field model of transformer coupled with static magnetic field and field circuit is established. The static magnetic field model is used to calculate the leakage magnetic field distribution and the electric force of the winding when the transformer has no load, rated load and external short circuit. The field circuit coupled transient magnetic field model is used to calculate the internal electromagnetic parameters of the transformer, the electrodynamic force of the winding, the current at the end of the winding and the equivalent short circuit impedance. The correctness of the field-circuit coupling transient model is verified by short-circuit test. (3) the fault model of the field-circuit coupling winding is established for the inter-turn short circuit of the winding of distribution transformer and the short-circuit of the winding to the ground. Forward calculation of transformer leakage magnetic field distribution, winding electromotive force, winding end current and equivalent short circuit impedance before and after short-circuit fault, This paper provides the basis and quantification standard for fault diagnosis of short circuit winding. 4. The field circuit coupling fault model of axial displacement deformation of distribution transformer winding and aging of insulation medium of winding is established, and the leakage magnetic field distribution of transformer when winding fault is calculated in the forward direction. Winding electromotive force, winding end current and winding equivalent short circuit impedance, This paper provides the basis and quantification standard for on-line diagnosis of potential winding faults. 5. An on-line diagnosis system for the reverse diagnosis of winding fault by calculating winding short-circuit impedance through winding terminal current and voltage parameters is established, and an experimental platform is established. To verify the accuracy of on-line measurement of winding short-circuit impedance and to analyze the error. (6) the on-line fault diagnosis platform of distribution transformer windings is established, and the on-line winding short-circuit impedance measurement and transformer hoisting winding inspection are carried out. The accuracy of on-line diagnosis method of transformer winding fault is determined.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM421
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