WO2023093660A1 - Dispositif et procédé d'évaluation de degré de déformation d'enroulement de transformateur basé sur une détection sans interruption de courant - Google Patents

Dispositif et procédé d'évaluation de degré de déformation d'enroulement de transformateur basé sur une détection sans interruption de courant Download PDF

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Publication number
WO2023093660A1
WO2023093660A1 PCT/CN2022/133136 CN2022133136W WO2023093660A1 WO 2023093660 A1 WO2023093660 A1 WO 2023093660A1 CN 2022133136 W CN2022133136 W CN 2022133136W WO 2023093660 A1 WO2023093660 A1 WO 2023093660A1
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WIPO (PCT)
Prior art keywords
phase
detection coil
winding
transformer
signal
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PCT/CN2022/133136
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English (en)
Chinese (zh)
Inventor
俞华
李劲松
董理科
陈青松
刘宏
李国栋
李帅
杨虹
刘杨
毕建刚
常文治
胡帆
王强
赵金
刘建华
邢秀峰
梁基重
芦竹茂
原辉
王帅
程胤璋
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国网山西省电力公司电力科学研究院
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Application filed by 国网山西省电力公司电力科学研究院 filed Critical 国网山西省电力公司电力科学研究院
Priority to JP2023516799A priority Critical patent/JP7461568B2/ja
Publication of WO2023093660A1 publication Critical patent/WO2023093660A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/62—Testing of transformers

Definitions

  • the invention belongs to the technical field of power equipment quality detection, and in particular relates to a transformer winding deformation evaluation device and method based on non-stop detection.
  • Winding deformation is a common problem in transformer operation. Under normal circumstances, a transformer with deformed windings will continue to operate for a period of time, but if it cannot be properly repaired, the cumulative effect caused by the deformation of the windings will further develop, eventually leading to damage to the transformer and affecting the reliability of power supply.
  • the traditional transformer winding deformation detection mainly relies on frequency response detection of power failure, short-circuit impedance and other methods. The biggest problems of these methods are: first, the power failure of the transformer is required, which affects the reliability of power supply; second, these detection methods have their own shortcomings.
  • the frequency response detection is too sensitive, and the detection results of short-circuit impedance detection are subject to large interference factors under small current detection, which is prone to large deviations, which seriously affects the evaluation and diagnosis of transformer winding deformation. Once the degree of transformer winding deformation cannot be misjudged, it may aggravate the damage of the transformer and even cause a large-scale power outage.
  • the patent technology CN202011528297.0 in the prior art discloses a method and device for on-line monitoring of power transformer winding deformation. , real-time feedback of winding deformation.
  • the patent has a single monitoring signal, which cannot overcome the detection error caused by the disturbance of the external and internal components of the transformer winding, and the accuracy is not high.
  • the present invention overcomes the deficiencies in the prior art, and provides a transformer winding deformation evaluation device and method based on non-stop detection.
  • the degree of deformation provides a decision-making basis for transformer maintenance and avoids the expansion of transformer faults.
  • the invention is of great significance for preventing transformer damage and improving operational reliability.
  • a transformer winding deformation evaluation device based on non-stop detection including: a vibration sensor, a capacitive current sampling box, a signal processing unit, an upper detection coil and a lower detection coil, and the six capacitive current sampling boxes are respectively arranged on the medium voltage sleeve of the transformer
  • the vibration sensor is set at the center of the transformer oil tank, and there are multiple transformers inside the transformer.
  • Transformer windings are A-phase transformer windings, B-phase transformer windings, and C-phase transformer windings.
  • the transformer windings include: core main column, upper iron yoke, lower iron yoke, low-voltage winding, medium-voltage winding and high-voltage winding.
  • the low-voltage winding, medium-voltage winding and high-voltage winding are sequentially sleeved on the main column of the iron core from the inside to the outside.
  • the upper detection coil is set on the The lower end of the upper iron yoke, and the upper detection coil is located directly above between the medium voltage winding and the low voltage winding, the lower detection coil is arranged at the upper end of the lower iron yoke, and the lower detection coil is located at the
  • the capacitive current sampling box, the vibration sensor, the upper detection coil, and the lower detection coil are all connected to the signal processing unit directly below the low-voltage winding and the main column of the iron core.
  • both the upper detection coil and the lower detection coil have a circular structure
  • the value of the diameter of the upper detection coil is the difference between the radius of the medium-voltage winding and the radius of the low-voltage winding
  • the value of the diameter of the lower detection coil is The difference between the radius of the low-voltage winding and the radius of the main column of the iron core.
  • both the upper detection coil and the lower detection coil are connected to the signal processing unit through the detection coil signal line, and the outside of the detection coil signal line is provided with insulating cardboard and a ferromagnetic shielding sheet, that is, the detection coil There are insulating cardboard and ferromagnetic shielding sheets between the signal line and the transformer shell, the upper iron yoke or the lower iron yoke, which play a shielding effect on the detection coil signal line and overcome the complex leakage magnetic field of the transformer. Signal line interference.
  • the detection coil signal line includes: a detection coil signal line A and a detection coil signal line B, the detection coil signal line A and the detection coil signal line B cooperate to realize the signal transmission of a detection coil, and the ferromagnetic shielding sheet A magnetic circuit dividing line is provided, and the ferromagnetic shielding sheet is divided into a ferromagnetic shielding sheet A and a ferromagnetic shielding sheet B by the magnetic circuit dividing line, and one end of the ferromagnetic shielding sheet A and the ferromagnetic shielding sheet B is connected, so
  • the ferromagnetic shielding sheet A corresponds to the position of the detection coil signal line A
  • the ferromagnetic shielding sheet B corresponds to the position of the detection coil signal line B
  • the magnetic circuit dividing line is set on the ferromagnetic shielding sheet
  • the method for evaluating the degree of transformer winding deformation based on non-stop detection using the above-mentioned device includes the following steps:
  • Winding deformation signal monitoring by extracting the monitoring signal of the vibration sensor for analysis and identification, the effective value of each harmonic component and the peak value of the characteristic frequency of the voltage signal are extracted; through six capacitive current sampling boxes, the medium voltage bushing phase A, The capacitive current of phase B and phase C and the capacitive current of phase A, phase B and phase C of the low-voltage bushing; through the upper detection coil and the lower detection coil, respectively monitor the change of the magnetic flux leakage signal caused by the deformation of the winding;
  • Relative capacitance ratio monitoring real-time extraction of the data in the sampling box of the capacitance current of phase A, phase B, and phase C of the medium voltage bushing, and obtaining the corresponding capacitance currents I 12A , I 12B of phase A, phase B, and phase C of the medium voltage bushing respectively , I 12C , whose initial currents are I 02A , I 02B , and I 02C ; real-time extraction of the data in the sampling box of the capacitance current of phase A, phase B, and phase C of the low-voltage bushing to obtain phase A, phase B, and phase C of the low-voltage bushing
  • the corresponding capacitive currents I 11A , I 11B , and I 11C respectively, and their initial currents are I 01A , I 01B , and I 01C ;
  • Flux leakage signal monitoring U b1A , U b1B , and U b1C are obtained from the upper detection coils respectively arranged at the A-phase transformer winding, B-phase transformer winding, and C-phase transformer winding, respectively representing the upper parts of A-phase, B-phase, and C-phase
  • the strength of the leakage magnetic field signal is obtained from the lower detection coils at the A-phase transformer winding, B-phase transformer winding, and C-phase transformer winding respectively to obtain U b2A , U b2B , and U b2C , which represent the phase A, phase B, and phase C respectively.
  • the intensity of the leakage magnetic field signal at the lower part
  • the transformer winding has general deformation
  • the present invention has the following beneficial effects.
  • the invention solves the problems of inaccurate transformer winding deformation monitoring and low reliability caused by traditional monitoring technology, and evaluates the degree of transformer winding deformation in real time through non-stop detection, which is conducive to timely discovery of latent deformation of transformer windings and timely formulation of transformer maintenance.
  • the strategy ensures the safe and reliable operation of the transformer, which is of great significance to ensure the reliability of the grid power supply.
  • Fig. 1 is a structural schematic diagram of the present invention.
  • Fig. 2 is a schematic diagram of the detection coil of the present invention.
  • Fig. 3 is a schematic diagram of the ferromagnetic shielding sheet of the present invention.
  • 1 is the fuel tank
  • 2 is the vibration sensor
  • 3 is the capacitive current sampling box
  • 4 is the signal processing unit
  • 5 is the upper detection coil
  • 6 is the lower detection coil
  • 7 is the medium voltage bushing
  • 8 is the low voltage bushing
  • 9 is the main column of the iron core
  • 10 is the upper iron yoke
  • 11 is the lower iron yoke
  • 12 is the low-voltage winding
  • 13 is the medium-voltage winding
  • 14 is the high-voltage winding
  • 15 is the detection coil signal line
  • 16 is insulating cardboard
  • 17 is the detection coil Signal line A
  • 18 is the detection coil signal line B
  • 19 is the magnetic circuit dividing line
  • 20 is the ferromagnetic shielding sheet A
  • 21 is the ferromagnetic shielding sheet B.
  • the transformer winding deformation evaluation device based on non-stop detection includes: vibration sensor 2, capacitive current sampling box 3, signal processing unit 4, upper detection coil 5 and lower detection coil 6, the six described
  • the capacitive current sampling boxes 3 are respectively arranged at the end screens of the A phase, B phase, and C phase of the medium voltage bushing 7 and the A phase, B phase, and C phase end screens of the low voltage bushing 8 of the transformer.
  • the sensor 2 is set at the center of the oil tank 1 of the transformer.
  • Figure 1 is an oil-immersed transformer, and its oil tank is the shell of the transformer.
  • each of the transformer windings includes: core main column 9, upper iron yoke 10, lower iron yoke 11, low voltage winding 12, medium voltage winding 13 and high voltage winding 14, the low voltage winding 12 , the medium-voltage winding 13 and the high-voltage winding 14 are sequentially sleeved on the main column 9 of the iron core from the inside to the outside, the upper detection coil 5 is arranged at the lower end of the upper iron yoke 10, and the upper detection coil 5 is located at Directly above between the medium voltage winding 13 and the low voltage winding 12, the lower detection coil 6 is arranged on the upper end of the lower iron yoke 11, and the lower detection coil 6 is located between the low voltage winding 12 and the iron core Right below the main columns 9 , the capacitive current sampling box 3 , the vibration sensor 2 , the upper detection coil 5 , and
  • Both the upper detection coil 5 and the lower detection coil 6 have a circular structure, the value of the diameter of the upper detection coil 5 is the difference between the radius of the medium voltage winding 13 and the radius of the low voltage winding 12, and the diameter of the lower detection coil 6 is The value of is the difference between the radius of the low-voltage winding 12 and the radius of the main post 9 of the iron core.
  • Both the upper detection coil 5 and the lower detection coil 6 are connected to the signal processing unit 4 through the detection coil signal line 15, and the outside of the detection coil signal line 15 is provided with an insulating cardboard 16 and a ferromagnetic shielding sheet, that is, the There are insulating cardboards and ferromagnetic shielding sheets between the signal wires of the detection coil and the transformer shell, the upper iron yoke or the lower iron yoke.
  • the detection coil signal line 15 includes: a detection coil signal line A17 and a detection coil signal line B18, and the detection coil signal line A17 and the detection coil signal line B18 cooperate to realize signal transmission of a detection coil, and the ferromagnetic
  • the shielding sheet is provided with a magnetic circuit dividing line 19, and the ferromagnetic shielding sheet is divided into a ferromagnetic shielding sheet A20 and a ferromagnetic shielding sheet B21 by the magnetic circuit dividing line 19, and the ferromagnetic shielding sheet A20 and the ferromagnetic shielding sheet B21 One end is connected, the ferromagnetic shielding sheet A20 corresponds to the position of the detection coil signal line A17, and the ferromagnetic shielding sheet B21 corresponds to the position of the detection coil signal line B18.
  • the evaluation method of transformer winding deformation degree based on non-stop detection includes the following steps:
  • Winding deformation signal monitoring by extracting the monitoring signal of the vibration sensor for analysis and identification, the effective value of each harmonic component and the peak value of the characteristic frequency of the voltage signal are extracted; through six capacitive current sampling boxes, the medium voltage bushing phase A, The capacitive current of phase B and phase C and the capacitive current of phase A, phase B and phase C of the low-voltage bushing; through the upper detection coil and the lower detection coil, respectively monitor the change of the magnetic flux leakage signal caused by the deformation of the winding;
  • Relative capacitance ratio monitoring real-time extraction of the data in the sampling box of the capacitance current of phase A, phase B, and phase C of the medium voltage bushing, and obtaining the corresponding capacitance currents I 12A , I 12B of phase A, phase B, and phase C of the medium voltage bushing respectively , I 12C , whose initial currents are I 02A , I 02B , and I 02C ; real-time extraction of the data in the sampling box of the capacitance current of phase A, phase B, and phase C of the low-voltage bushing to obtain phase A, phase B, and phase C of the low-voltage bushing
  • the corresponding capacitive currents I 11A , I 11B , and I 11C respectively, and their initial currents are I 01A , I 01B , and I 01C ;
  • Flux leakage signal monitoring U b1A , U b1B , and U b1C are obtained from the upper detection coils respectively arranged at the A-phase transformer winding, B-phase transformer winding, and C-phase transformer winding, respectively representing the upper parts of A-phase, B-phase, and C-phase
  • the strength of the leakage magnetic field signal is obtained from the lower detection coils at the A-phase transformer winding, B-phase transformer winding, and C-phase transformer winding respectively to obtain U b2A , U b2B , and U b2C , which represent the phase A, phase B, and phase C respectively.
  • the intensity of the leakage magnetic field signal at the lower part
  • the transformer winding has general deformation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

L'invention concerne un dispositif et un procédé d'évaluation de degré de déformation d'enroulement de transformateur sur la base d'une détection sans interruption de courant. Le dispositif d'évaluation comprend : un capteur de vibrations (2), des boîtiers d'échantillonnage de courant capacitif (3), une unité de traitement de signal (4), des bobines de détection supérieures (5) et des bobines de détection inférieures (6). Le capteur de vibrations (2) est disposé au centre d'un réservoir d'huile de transformateur (1), plusieurs enroulements de transformateur sont disposés sur un transformateur, les bobines de détection supérieures (5) sont disposées à l'extrémité inférieure d'une culasse en fer supérieure (10), et les bobines de détection inférieures (6) sont disposées à l'extrémité supérieure d'une culasse en fer inférieure (11). Les boîtiers d'échantillonnage de courant capacitif (3), le capteur de vibrations (2), les bobines de détection supérieures (5) et les bobines de détection inférieures (6) sont tous connectés à l'unité de traitement de signal (4). La méthode d'évaluation comprend les étapes suivantes : la surveillance du signal de déformation de l'enroulement, l'analyse de l'extraction du signal de déformation de l'enroulement et l'évaluation du degré de déformation de l'enroulement.
PCT/CN2022/133136 2021-11-23 2022-11-21 Dispositif et procédé d'évaluation de degré de déformation d'enroulement de transformateur basé sur une détection sans interruption de courant WO2023093660A1 (fr)

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JP2023516799A JP7461568B2 (ja) 2021-11-23 2022-11-21 無停電検出に基づく変圧器の巻線変形程度評価装置及び方法

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CN202111392730.7 2021-11-23
CN202111392730.7A CN114200349B (zh) 2021-11-23 2021-11-23 基于不停电检测的变压器绕组变形程度评估方法

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CN114200349B (zh) * 2021-11-23 2023-10-13 国网山西省电力公司电力科学研究院 基于不停电检测的变压器绕组变形程度评估方法

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CN202582602U (zh) * 2012-04-26 2012-12-05 江苏骏龙电力科技股份有限公司 变压器运行状态综合监测系统
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