CN111856380B - Oil-immersed upright current transformer defect checking system - Google Patents
Oil-immersed upright current transformer defect checking system Download PDFInfo
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- CN111856380B CN111856380B CN202010729776.2A CN202010729776A CN111856380B CN 111856380 B CN111856380 B CN 111856380B CN 202010729776 A CN202010729776 A CN 202010729776A CN 111856380 B CN111856380 B CN 111856380B
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Abstract
The invention provides a defect checking system for an oil-immersed vertical current transformer, which comprises an information input module, a testing device, a sample detection device, a central processing module, a disassembly process recording module, a defect diagnosis module and an information output module. The system realizes the preliminary judgment of the defects based on the defect information and the historical test data of the defect oil immersion upright current transformer. By utilizing the disassembly method and the defect checking method of the system built-in, the internal defect condition of the oil-immersed upright current transformer is associated with the external test and detection result, and a direct and effective diagnosis basis is provided. Aiming at the condition of not checking the results, the system can start a current transformer operation characteristic simulation test platform for simulating the degradation development process of the current transformer. Namely: the system improves the accuracy of the defect diagnosis result, is favorable for solving the production problem and accumulating the defect investigation experience, and lays a technical foundation for constructing the defect investigation expert library.
Description
Technical Field
The invention belongs to the field of electrical engineering, and relates to a defect checking system for an oil-immersed upright current transformer, which is used for checking the defect cause of the oil-immersed upright current transformer.
Background
The oil-immersed vertical current transformer has a wide application range in an electric field.
The standard and regulation stipulate that routine tests of the oil-immersed vertical current transformer have items such as dielectric loss, capacitance, insulation resistance test, detection of dissolved gas in oil and the like, the types of the items are relatively few, and the period is generally three years. The oil-immersed current transformer belongs to less-oil electrical equipment, and is not suitable for frequent sampling in operation, so that the detection and tracking of insulating oil products cannot be carried out. Based on the current situation, once a defect occurs in the oil-immersed upright current transformer, the defect often appears as an emergency event, and in addition, the historical test data of the oil-immersed upright current transformer is difficult to support the defect reason analysis due to the fact that the test items are few and the test period is long.
Equipment disassembly is a common means of analyzing and verifying the cause of defects in electrical equipment. In the face of the dilemma that the historical test result is difficult to support defect analysis, the disassembling means is particularly important for diagnosing and analyzing the defect cause of the oil-immersed upright current transformer. However, the oil immersed vertical current transformer is manufactured by a plurality of manufacturers, structural terms of components of the vertical current transformer are not unified, and the disassembly process is not professional and comprehensive. The defect inspection process of the oil-immersed defect upright current transformer is not smooth or no result is generated in the defect inspection process due to the situations that the defect position is not found due to improper disassembly, necessary tests are omitted in the disassembly process, and the defect reason cannot be effectively presumed.
In view of this, it is necessary to develop a set of defect troubleshooting system for the oil-immersed vertical current transformer, standardize the defect troubleshooting process for the oil-immersed vertical current transformer, and solve the practical problems of production. Meanwhile, the method is beneficial to accumulating the defect troubleshooting experience of the oil-immersed vertical current transformer, and lays a technical foundation for constructing a defect troubleshooting expert library of the oil-immersed vertical current transformer.
Disclosure of Invention
The invention provides a defect checking system for an oil-immersed vertical current transformer, and aims to standardize the defect checking process of the oil-immersed vertical current transformer and improve the accuracy of a defect diagnosis result.
The invention aims to realize the defect checking system, and the defect checking system comprises an information input module, a testing device, a sample detection device, a central processing module, a disassembly process recording module, a defect diagnosis module and an information output module;
recording the oil immersed upright current transformer to be checked as a transformer to be checked;
the information input module is unidirectionally connected with the central processing module and the disassembling process recording module, transmits the structural information, the defect information and the historical test data of the mutual inductor to be checked to the central processing module, and transmits the structural information of the mutual inductor to be checked to the disassembling process recording module;
the test device at least comprises: the device comprises an insulation resistance tester, a direct current resistance tester, a high-voltage dielectric loss and capacitance tester, a partial discharge tester, an oil dissolved gas tester, an oil moisture content tester and an oil voltage withstand detector, wherein the insulation resistance tester, the direct current resistance tester, the high-voltage dielectric loss and capacitance tester and the partial discharge tester are used for testing the electrical parameters of the mutual inductor to be checked, and the oil dissolved gas tester, the oil moisture content tester and the oil voltage withstand detector are used for detecting the insulating oil performance of the mutual inductor to be checked; the testing device is connected with the central processing module in a one-way mode and used for transmitting the testing and detection results of the testing device to the central processing module;
the sample detection device is bidirectionally connected with the disassembly process recording module, receives disassembly, detection and sampling commands of the disassembly process recording module, photographs the disassembly process and detects the taken sample according to the disassembly and investigation steps of the mutual inductor to be investigated prestored by the disassembly process recording module, and transmits the photographed photographs and sample detection information to the disassembly process recording module; the sample detection device comprises a camera, a galvanometer scanner, an element energy spectrum analyzer and a temperature-controllable sample soaking device and is used for shooting a sample taken in the disassembling process of the mutual inductor to be inspected and detecting the sample taken in the disassembling process of the mutual inductor to be inspected;
the disassembly process recording module is connected with the sample detection device in a bidirectional way and is connected with the defect diagnosis module in a unidirectional way; the disassembly process recording module sends disassembly, detection and sampling commands to the sample detection device according to the pre-stored disassembly and investigation steps of the mutual inductor to be investigated, receives pictures and sample detection information obtained by the sample detection device, and transmits the integrated disassembly information to the defect diagnosis module after matching and corresponding to the disassembly steps of the mutual inductor to be investigated;
the central processing module is connected with the information input module, the testing device and the defect diagnosis module in a one-way mode; the central processing module receives the information transmitted by the information input module and the test device, screens and combs the information, and then transmits effective information obtained after screening and combing of the mutual inductor to be checked to the defect diagnosis module;
the defect diagnosis module is connected with the central processing module, the disassembly process recording module and the information output module in a one-way mode; the defect diagnosis module receives effective information of the mutual inductor to be checked after screening and combing, which is transmitted by the central processing module, receives disassembly information integrated by the disassembly process recording module, analyzes and diagnoses the defect cause of the mutual inductor to be checked, and transmits the defect cause to the information output module.
Preferably, the information input module and the information output module are connected with the power company production management system through an internal network.
Preferably, the test device further comprises an insulating paper moisture content test device, an insulating oil pour point detector, a flash point detector and an acid value detector.
Preferably, the sample detection device further comprises a furfural content detector and an insulating paper moisture content detector.
Preferably, the disassembling and checking step of the mutual inductor to be checked comprises the following steps:
step 1, collecting structural information of a mutual inductor to be checked;
step 2, developing a diagnostic test before disassembling the mutual inductor to be checked:
step 3.1, checking the sealing condition and emptying the insulating oil;
step 3.2, separating the body;
step 3.3, disassembling the body and gradually checking the defects of the body;
step 3.4, measuring the size of the primary conductor;
step 4, calculating and checking the actually measured inter-screen capacitance between the adjacent main capacitive screens;
and 5, detecting the samples taken in the step 2 and the step 3.
Preferably, the defect diagnosis module is also in bidirectional communication connection with an oil-immersed upright current transformer operating characteristic simulation test platform; if the defect diagnosis module does not give the defect cause of the current transformer to be checked, the defect diagnosis module sends a starting simulation test signal to the oil-immersed upright current transformer operating characteristic simulation test platform; after the simulation test is finished, the simulation test platform for the operating characteristics of the oil-immersed upright current transformer transmits the simulation test result of the oil-immersed upright current transformer test sample to the defect diagnosis module, and the defect diagnosis module transmits the defect similarity comparison result to the information output module after integrating the simulation test result.
Preferably, the oil-immersed upright current transformer operating characteristic simulation test platform comprises a controllable temperature test box, an oil-immersed upright current transformer test sample placed in the controllable temperature test box, a sensor group, a current generating device, a voltage generating device, a temperature control device and a detection device, and is used for simulating the operating conditions of the oil-immersed upright current transformer in different environmental temperatures and temperature variation processes and under rated operating conditions, and researching the degradation development process of an insulating medium of the oil-immersed upright current transformer.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention develops a defect checking system for an oil-immersed upright current transformer, which can be used for defect diagnosis of the oil-immersed upright current transformer and solves the practical difficulty of production.
2. The oil-immersed vertical current transformer defect checking system developed by the invention is connected with a production management system of an electric power company, and can radiate a full-electric-network oil-immersed vertical current transformer with the effects that: the method can quickly obtain the defect information and historical test data of the defective oil-immersed upright current transformer and the operation information of the oil-immersed upright current transformer at the same interval, the same manufacturer and the same batch. The method is beneficial to accumulating the defect troubleshooting experience of the oil-immersed upright current transformer, is beneficial to finding out the familial defect of the oil-immersed upright current transformer, and can lay a technical foundation for constructing a defect troubleshooting expert library of the oil-immersed upright current transformer.
3. The invention discloses a defect troubleshooting system of an oil-immersed upright current transformer, and the built-in logic of the system relates to a defect troubleshooting method of the oil-immersed upright current transformer, which comprises the following steps:
firstly, based on the defect information, the historical test data and the equipment structure information of the defect oil-immersed upright current transformer obtained by the information input module, the central processing module classifies and combs test items and results according to delivery tests, handover tests, each state overhaul test and defect finding time, test items pointing to defects and change conditions of the test items can be obtained after troubleshooting, effective information after screening and combing of the defect oil-immersed upright current transformer is formed, and preliminary judgment of the defects is achieved.
And secondly, the defect diagnosis module receives effective information after screening and combing of the defect oil-immersed upright current transformer transmitted by the central processing module, the disassembly process recording module matches the disassembly step with the effective information after screening and combing of the defect oil-immersed upright current transformer to form integrated disassembly information, and the information relates the internal defect condition of the transformer to be inspected with external test and detection results, so that an effective diagnosis basis is provided for defect diagnosis.
And thirdly, the oil-immersed upright current transformer defect troubleshooting system is connected with a current transformer operating characteristic simulation test platform and can be used for researching the development process of defects such as 'non-vacuum oil injection' defect, 'insufficient drying' and the like introduced in the process manufacturing process. Namely: the defect occurrence and development process caused by improper process factors and process implementation is brought into the research range for the first time, and the defect causes are not limited to the operation of the power transformer, namely the research time range is expanded to the equipment manufacturing stage. Meanwhile, the current transformer operating characteristic simulation test platform can simulate the operating conditions of the oil-immersed upright current transformer under rated operating conditions in different environmental temperatures between-40 ℃ and 60 ℃ and in the temperature variation process, so as to research the degradation development process of the insulating medium of the oil-immersed upright current transformer; the system considers the influence of the operating environment temperature on the generation and development of the defects, and is more beneficial to comprehensively examining and predicting the cause of the defects.
In conclusion, the oil-immersed vertical current transformer defect checking system adopts a defect checking thought of progressive layer by layer, has stronger technical guidance and is easier for technical personnel to master.
4. The oil-immersed upright current transformer defect troubleshooting system is internally provided with a disassembling method and a defect troubleshooting method of the oil-immersed upright current transformer, and the disassembling troubleshooting process is guided step by step according to the method. Namely: the standardized disassembly and defect troubleshooting method of the oil-immersed upright current transformer can effectively avoid the problems that the defect position cannot be found due to improper disassembly, the defect reason cannot be effectively presumed due to omission of necessary tests in the disassembly process and the like, and improves the effectiveness of disassembly analysis.
5. Manufacturing processes, material quality, operating conditions, installation processes, environmental conditions, operating maintenance measures, and the like are all factors that affect the operating conditions of electrical equipment. The oil-immersed upright current transformer defect troubleshooting system is provided with an electric performance testing device such as an insulation resistance tester and an insulating oil performance testing device such as an oil pressure resistance detector, and is also provided with an auxiliary testing device such as a microscope scanner, an element energy spectrum analyzer and a temperature-controllable sample soaking device. The device can be used for electron microscope scanning and element energy spectrum analysis of high-voltage cable paper tapes, color-changing aluminum foil paper or copper woven bags; the constant-temperature soaking test of suspected abnormal materials in a new insulating oil reagent at 60-65 ℃ can be carried out. Namely: the defect inspection system is assisted by means of microscopic detection, material performance detection and the like, perfects the defect inspection process of the oil-immersed upright current transformer, and can be more favorable for assisting in evidence of the cause of defect formation.
Drawings
Fig. 1 is a structural diagram of a defect inspection system of an oil-immersed vertical current transformer.
Fig. 2 is a structural diagram of an oil-immersed upright current transformer operating characteristic simulation test platform.
Fig. 3 is a schematic diagram of a process of disassembling the oil-immersed vertical current transformer and checking defects of the oil-immersed vertical current transformer.
Fig. 4 is a schematic structural diagram of the oil-immersed vertical current transformer.
Fig. 5 is a left side view of fig. 4.
Fig. 6 is a top view of fig. 4.
Fig. 7 is a schematic diagram of a primary winding structure of a 110kV oil-immersed vertical current transformer.
Fig. 8 is a schematic sectional view of a primary winding structure of a 110kV oil-immersed upright current transformer.
In fig. 1: 1. an information input module; 2. a testing device; 3. a sample detection device; 4. a central processing module; 5. disassembling the process recording module; 6. a defect diagnosis module; 7. an information output module; 21. an insulation resistance tester; 22. a direct current resistance tester; 23. high voltage dielectric loss and capacitance testing device; 24. a partial discharge test device; 25. a dissolved gas detection device in oil; 26. a moisture content detector in the oil; 27. An oil pressure resistance detector; 31. a camera; 32. a galvano-mirror scanner; 33. an elemental energy spectrum analyzer; 34. controllable temperature sample soak device.
In fig. 2, 35, a temperature controlled test chamber; 36. testing an oil-immersed upright current transformer; 37. a box body; 38. a box door; 39. a high voltage bushing; 40. a smooth metal conductive rod; 41. a primary terminal; 42. a primary winding; 43. a porcelain bushing; 44. a secondary terminal; 45. an oil tank; 46. a thermocouple sensor B; 47. an ultrasonic sensor; 48. an ultrahigh frequency sensor; 49. thermocouple sensor a.
In fig. 4-8, in which: 51. an oil level observation window; 52. an expander housing; 53. an oil drain valve; 54. A secondary winding lead-out wire; 55. a secondary terminal plate; 56. an upper pressing ring; 57. pressing a ring; 58. an expander; 59. a primary terminal; 60. a primary switching terminal; 61. a primary terminal connection location; 62. a secondary terminal; 63. an oil tank; 64. a porcelain bushing; 65. a primary winding; 66. a fiberglass strapping tape; 67. a pressure relief device; 68. a support; 69. a primary conductor; 70. a secondary winding; 71. a low voltage screen; 72. a low voltage screen lead-out wire; 73. knotting positions of the outgoing lines of the low-voltage screen; 74. a low-pressure screen soldering position; 75. a middle screen; 76. a high voltage screen; 77. a high-voltage screen lead-out wire; 78. end screen; 79. the outermost layer of high-voltage cable paper tape; 70. an innermost high-voltage cable paper tape; 81. primary winding main insulation; 82. semicircular U-shaped guide rod.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Fig. 1 is a structural diagram of a defect inspection system of an oil-immersed vertical current transformer. The figure shows that the oil-immersed upright current transformer defect checking system comprises an information input module 1, a testing device 2, a sample detection device 3, a central processing module 4, a disassembly process recording module 5, a defect diagnosis module 6 and an information output module 7.
And recording the oil immersed vertical current transformer to be checked as the transformer to be checked.
The information input module 1 is unidirectionally connected with the central processing module 4 and the disassembling process recording module 5, transmits the structural information, the defect information and the historical test data of the mutual inductor to be checked to the central processing module 4, and transmits the structural information of the mutual inductor to be checked to the disassembling process recording module 5.
In this embodiment, the structural information is obtained through a design drawing and a file of the transformer to be checked, and at least includes:
the materials of the low-voltage screen 71 and the high-voltage screen 76 of the mutual inductor to be checked; the material and total number of intermediate screens 75; the number of end screens 78 between adjacent main capacitive screens; designed inter-panel capacitance c between adjacent main capacitive panelsi(ii) a The total oil quantity of the mutual inductor to be checked and the weight of the insulating oil of the mutual inductor body to be checked.
In this embodiment, the defect information and the historical test data at least include: the defect information and the historical test data of the mutual inductor to be checked and the operation information of the oil-immersed upright current mutual inductor at the same interval, the same manufacturer and the same batch.
The test device 2 comprises at least: an insulation resistance tester 21, a direct current resistance tester 22, a high voltage dielectric loss and capacitance tester 23, a partial discharge tester 24, an oil dissolved gas detector 25, an oil moisture content detector 26 and an oil withstand voltage detector 27. The insulation resistance tester 21, the direct current resistance tester 22, the high-voltage dielectric loss and capacitance tester 23 and the partial discharge tester 24 are used for testing electrical parameters of the mutual inductor to be checked, and the dissolved gas in oil detector 25, the moisture content in oil detector 26 and the oil voltage resistance detector 27 are used for detecting the insulation oil performance of the mutual inductor to be checked. The testing device 2 is connected with the central processing module 4 in a one-way mode and used for transmitting the testing and detecting results of the testing device 2 to the central processing module 4. In this embodiment, the testing device further comprises an insulating paper moisture content testing device, an insulating oil pour point detector, a flash point detector and an acid value detector.
The sample detection device 3 is connected with the disassembly process recording module 5 in a two-way mode, receives disassembly, detection and sampling commands of the disassembly process recording module 5, takes pictures of the disassembly process and detects the taken samples according to the disassembly and investigation steps of the mutual inductor to be investigated prestored in the disassembly process recording module 5, and transmits the shot pictures and the sample detection information to the disassembly process recording module 5. The sample detection device 3 comprises a camera 31, a microscope scanner 32, an element energy spectrum analyzer 33 and a temperature-controllable sample soaking device 34, and is used for shooting a sample taken in the process of disassembling the mutual inductor to be inspected and detecting the sample taken in the process of disassembling the mutual inductor to be inspected. In this embodiment, the sample detection device 3 further includes a furfural content detector and a cardboard moisture content detector.
The disassembly process recording module 5 is connected with the sample detection device 3 in a bidirectional way and is connected with the defect diagnosis module 6 in a unidirectional way. The disassembling process recording module 5 sends disassembling, detecting and sampling commands to the sample detection device 3 according to the pre-stored disassembling and inspecting steps of the mutual inductor to be inspected, receives the pictures and the sample detection information obtained by the sample detection device 3, and transmits the integrated disassembling information to the defect diagnosis module 6 after matching and corresponding to the disassembling steps of the mutual inductor to be inspected.
The central processing module 4 is connected with the information input module 1, the testing device 2 and the defect diagnosis module 6 in a one-way mode. The central processing module 4 receives the information transmitted by the information input module 1 and the testing device 2, screens and combs the information, and then transmits the screened and combed effective information of the mutual inductor to be checked to the defect diagnosis module 6.
In this embodiment, screening and combing of the troubleshooting mutual inductor refer to: classifying and carding test items and results according to delivery tests, handover tests, various state overhaul tests and defect finding time, and obtaining test items pointing to defects and change conditions thereof after troubleshooting to form effective information after screening and carding of the defected oil-immersed vertical current transformer.
The defect diagnosis module 6 is connected with the central processing module 4, the disassembly process recording module 5 and the information output module 7 in a one-way mode. The defect diagnosis module 6 receives the screened and sorted effective information of the mutual inductor to be checked transmitted by the central processing module 4, receives the disassembly information integrated by the disassembly process recording module 4, analyzes and diagnoses the defect cause of the mutual inductor to be checked, and transmits the defect cause to the information output module 7.
In this embodiment, the information input module 1 and the information output module 7 are connected to the power company production management system 9 through an internal network, and are configured to directly capture the structural information, the defect information, and the historical test result of the transformer to be inspected from the power company production management system 9, and transmit the inspection result to the power company production management system 9.
Fig. 3 is a schematic view of a process of disassembling an oil-immersed vertical current transformer and inspecting defects thereof, and it can be seen from the schematic view that in this embodiment, the disassembling and inspecting steps of the transformer to be inspected include:
step 1, collecting structural information of a mutual inductor to be checked;
step 2, developing a diagnostic test before disassembling the mutual inductor to be checked;
step 3.1, checking the sealing condition and emptying the insulating oil;
step 3.2, separating the body;
step 3.3, disassembling the body and gradually checking the defects of the body;
step 3.4, measuring the size of the primary conductor;
step 4, calculating and checking the actual inter-screen capacitance between each middle screen and each high-voltage screen;
and 5, detecting the samples taken in the step 2 and the step 3.
Specifically, the disassembling and checking contents in each step are as follows:
step 1, collecting structural information of a mutual inductor to be checked, and recording the collected structural information into the oil-immersed upright current transformer defect checking system. The structural information is obtained by using an equipment structure drawing of the oil-immersed vertical current transformer, and at least comprises the following steps:
materials of the low-pressure screen 71 and the high-pressure screen 76: aluminum foil paper and semi-conductive paper, or copper braided belt;
material and total number of intermediate screens 75: aluminum foil paper and semi-conductive paper, or aluminum foil paper;
the number of end screens 78 between adjacent main capacitive screens;
designed inter-panel capacitance c between adjacent main capacitive panelsi；
The total oil quantity of the mutual inductor to be checked and the weight of the insulating oil of the mutual inductor body to be checked.
Step 2, developing test diagnosis before disassembling the mutual inductor to be investigated, comprising:
and the electrical test is used for testing the electrical parameters of the mutual inductor to be checked and recording the test result into the oil-immersed vertical current mutual inductor defect checking system. In the present embodiment, the electrical test refers to testing the electrical parameters of the transformer to be inspected by using the insulation resistance tester 21, the dc resistance tester 22, the high voltage dielectric loss and capacitance tester 23, and the partial discharge tester 24.
The oil drain valve 53 on the oil tank 63 is unscrewed, the oil drain valve 53 and the small vacuum oil storage container are connected by a sampling hose, the insulating oil is sampled, and the oil drain valve 53 is closed after sampling. In the present embodiment, before the diagnostic test before disassembly of the mutual inductor to be investigated is carried out, the oil level indication indicated by the oil level observation window 51 is observed and recorded. In this example, the amount of oil sampled is not less than 1000 ml; the insulating oil can also increase the detection items such as pour point, flash point, oil body resistivity, gas content and the like
The positions of the oil level observation window 51, the oil drain valve 53 and the oil tank 63 are shown in fig. 5, that is, the structure of the mutual inductor to be examined related to the present embodiment is shown in fig. 4, 5 and 6. Fig. 7 is a schematic diagram of a primary winding structure of a 110kV oil-immersed vertical current transformer. Fig. 8 is a schematic sectional view of a primary winding structure of a 110kV oil-immersed upright current transformer.
step 3.1, checking the sealing condition and emptying the insulating oil;
dismantling the expander outer cover 52, unscrewing the pressure release device 67, judging the sealing condition of the expander according to the air flow sound at the moment of unscrewing the pressure release device 67, and recording;
and (3) unscrewing the oil drain valve 53 on the oil tank 63 to drain oil, connecting the oil drain valve 53 and the small vacuum oil storage container by using a sampling hose when the oil allowance in the oil tank 63 is 1/2-1/3 of the total oil amount, sampling insulating oil, and draining the oil in the mutual inductor body to be checked after sampling is finished.
Step 3.2, separating the body;
detaching the secondary terminal plate 55, and nipping the secondary winding lead 54 connected to the secondary terminal plate 55 and the low-voltage screen lead 72 of the primary winding 65;
removing the expander 58;
dismantling the upper pressing ring 56 and the lower pressing ring 57, respectively checking the use state of the sealing rubber gasket at the compression joint of the upper pressing ring 56 and the lower pressing ring 57, and photographing and recording; if the sealing rubber gasket is torn and/or bulges and/or is not tightly sealed, sampling the sealing rubber gasket; in the present embodiment, the primary terminal 59 and the primary swap terminal 60 are connected to the upper pressing ring 56, and the primary terminal 59 and the primary swap terminal 60 are removed together when the upper pressing ring 56 is removed;
the metal lead wire at the primary terminal connection position 61 is pinched off to separate the primary conductor 69 from the primary terminal 59;
if the mutual inductor to be checked is a porcelain bushing outlet wire, the porcelain bushing 64 is removed; if the mutual inductor to be checked is an outlet wire of the oil conservator, the oil conservator is removed while the porcelain bushing 64 is removed;
and separating the transformer body to be inspected, specifically, hoisting the transformer body to be inspected by using a top crane, and dismantling the oil tank 63.
Step 3.3, disassembling the body and gradually checking the defects of the body;
step 3.3.1, dismantling the secondary winding 70;
removing the bracket 18, cutting the fiberglass strapping tape 66, and separating the secondary winding 70;
checking whether the high-voltage cable paper tape overlapped by the secondary winding 70 and the secondary winding lead-out wire 54 has the abnormal phenomena of ablation and/or carbonization and/or X wax precipitation, and taking a picture and recording;
3.3.2, removing the low-voltage screen 71, and testing dielectric loss and capacitance between the low-voltage screen 71 and the high-voltage screen 76;
checking whether the appearance of the primary winding 65 is deformed;
checking whether the outermost high-voltage cable paper tape 79 overlapped by the primary winding 65 has the abnormal phenomena of ablation and/or carbonization and/or X wax precipitation, and taking a picture and recording;
whether the abnormal phenomena of abrasion and/or cracking and/or ablation and/or carbonization exist in the high-voltage cable paper tape at the positions where the low-voltage screen outgoing line 72 and the high-voltage screen outgoing line 77 which are led out from the outer surface of the primary winding 65, and photographing and recording are carried out;
connecting the high-voltage screen outgoing line 77 with the primary conductor 69, and then grounding to prepare for dielectric loss and capacitance measurement test;
the wallpaper cutter is used for cutting and peeling off the outermost high-voltage cable paper tape 79 laminated on the outer layer of the primary winding 65 layer by layer along the horizontal direction until the low-voltage screen 71 of the primary winding 65 is exposed;
checking the appearance of the low-voltage screen 71, checking whether the aluminum foil paper and/or the semiconductive paper forming the low-voltage screen 71 has cracks and/or ablation abnormal phenomena, and whether the aluminum foil paper or the copper woven belt has color change abnormal phenomena, and if the color change abnormal phenomena exist, respectively sampling at color change positions and non-color change positions; taking a picture and recording;
checking the low-voltage screen lead wire 72, checking whether the abnormal phenomena of ablation and/or carbonization exist at the low-voltage screen lead wire knotting position 73 and the low-voltage screen soldering position 74, and taking a picture and recording;
respectively testing the dielectric loss between the low-voltage screen 71 and the high-voltage screen 76 and the capacitance between the low-voltage screen 71 and the high-voltage screen 76 by using a dielectric loss and capacitance testing device under the conditions that the applied voltage is 3kV and 5kV, and recording;
stripping the low-voltage screen 71 and a low-voltage screen lead wire 72 welded on the low-voltage screen 21;
3.3.3, removing the intermediate screens 75 one by one, and testing dielectric loss and capacitance between each intermediate screen 75 and each high-voltage screen 76;
the high-voltage screen 76 is a screen 0, the low-voltage screen 71 is a screen k +1, the total number of the intermediate screens 75 is k, k is a positive integer, and any one of the k intermediate screens 75 is marked as an i screen, i is 1, 2. The high-voltage screen 76, the middle screen 75 and the low-voltage screen 71 are collectively called as main capacitive screens, and multiple layers of high-voltage cable paper tapes are overlapped among the main capacitive screens;
peeling off the high-voltage cable paper tape overlapped outside the i screen, specifically, utilizing a wallpaper cutter to cut and peel off the high-voltage cable paper tape overlapped outside the i screen layer by layer along the horizontal direction, checking whether the peeled high-voltage cable paper tape has an abnormal phenomenon of ablation and/or carbonization and/or X wax precipitation, and whether the high-voltage cable paper tape initial overlapping position has an abnormal phenomenon of binding cavity and/or deformation, and taking a picture and recording; in the disassembly and investigation process, sampling white glue for bonding the high-voltage cable paper tape at the initial overlapping position of the high-voltage cable paper tape;
carrying out appearance inspection on the i screen, checking whether the aluminum foil paper and/or the semi-conductive paper forming the i screen has cracks and/or ablation abnormal phenomena, photographing and recording;
testing the dielectric loss Tan between the i screen and the 0 screen by using a dielectric loss and capacitance testing device under the conditions that the applied voltage is 3kV and 5kVi/0And a capacitance Ci/0And recording; dielectric loss between the low-voltage screen 71 and the high-voltage screen 76, and capacitance between the low-voltage screen 71 and the high-voltage screen 76 are recorded as dielectric loss Tank+1/0And a capacitance Ck + 1/0;
peeling off the i screen, and after disassembling the i screen until the high-voltage screen 76 of the primary winding 65 is exposed, the disassembling process of the intermediate screen 75 is finished;
step 3.3.4, removing the high-voltage screen 76;
checking whether the appearance of the high-voltage screen 76 and the high-voltage screen lead-out wire 77 have abnormal phenomena or not, wherein the checking method is the same as that for the low-voltage screen 71 and the low-voltage screen lead-out wire 72 in the step 3.3.2, and photographing and recording;
stripping the high-voltage screen 76 and a high-voltage screen lead wire 77 welded on the high-voltage screen 76;
checking the overlapping condition of the innermost high-voltage cable paper tape 80 of the primary winding 75, checking whether transition unevenness and/or protrusion abnormal phenomena exist or not, and taking a picture and recording; sampling the innermost high-voltage cable paper tape 80 of the primary winding 65 lap;
horizontally and layer-by-layer cutting and stripping the innermost high-voltage cable paper tape 80 of the primary winding 65 by using a wallpaper cutter;
step 3.3.2, step 3.3.3 and step 3.3.4 are processes of gradually disassembling and inspecting the primary winding 65 layer by layer from outside to inside, and the mutual inductor to be inspected is placed on the insulating support in the disassembling and inspecting processes; the number of end screens 78 between two adjacent main capacitive screens is checked and recorded during the main capacitive screen peeling process.
Step 3.4, measuring the size of the primary conductor 69;
the upper, middle and lower parts of the metal rods on the two sides of the U-shaped primary conductor 69 and the bottom part of the U-shaped primary conductor are selected, the diameter of the primary conductor 69 is tested respectively, and the diameter is recorded.
If the primary conductor 69 is formed by semicircular "U" shaped guide rods 82, it is necessary to detect whether the transition of the high voltage cable paper 80 laminated in the primary winding 65 is not smooth and/or the abnormal phenomenon of protrusion is caused by the fact that the two semicircular "U" shaped guide rods 82 do not meet the design tolerance and/or the offset of the butt joint face.
And (4) recording all the records in the step (3) into a defect checking system of the oil-immersed vertical current transformer.
Step 4, calculating and checking the actually measured inter-screen capacitance between the adjacent main capacitive screens;
and 5, detecting the samples taken in the step 2 and the step 3.
And (3) detecting the oil sample of the insulating oil obtained in the step (2) and the step (3.1), specifically, detecting the insulating oil performance of the transformer to be detected by using an oil dissolved gas detection device 25, an oil moisture content detector 26 and an oil pressure resistance detector in the oil immersion upright current transformer defect detection system to detect the insulating oil 27, and recording the detection result.
Respectively detecting a sample of the innermost high-voltage cable paper tape 80 and a sample of an aluminum foil paper or a copper woven bag by using a microscope scanner 32 and an element energy spectrum analyzer 33 in the oil-immersed upright current transformer defect checking system, and recording detection results;
respectively and separately soaking samples of white glue, a sealing rubber mat, aluminum foil paper or a copper woven bag in a new insulating oil reagent of a temperature-controllable sample soaking device in an oil-immersed upright current transformer defect inspection system for 72 hours in a constant temperature environment of 60-65 ℃, detecting the soaked reagent after one week, and recording the detection result;
and (5) recording all detection results into the oil-immersed vertical current transformer defect inspection system.
Fig. 4-8 show the structure of the oil-immersed vertical current transformer, and as can be seen from fig. 4-8, the structure and components of the oil-immersed vertical current transformer in the present invention are as follows:
and sequentially removing the expander outer cover 52, emptying the insulating oil of the transformer body to be inspected by using the oil drain valve 53, removing the secondary terminal board 55, removing the expander 58, the upper pressing ring 56, the lower pressing ring 57, the primary terminal 59, the primary change-over terminal 60, removing the porcelain bushing 64 and the oil tank 63, and separating to obtain the transformer body to be inspected.
Namely: the ware body of waiting to investigate the mutual-inductor includes: a bracket 68, a primary conductor 69, a primary winding 65, a secondary winding 70, and auxiliary materials such as lead wires and terminals, a glass fiber binding tape 66, etc., of the primary conductor 69, the primary winding 65, and the secondary winding 70, which are connected to the removed parts. Wherein: the primary conductor 69 and the primary terminal 59 are connected by a metal lead wire at the primary terminal connection position 61. The secondary winding lead wire 54, which is a lead wire of the secondary winding 70, is connected to a secondary terminal plate 55 fixed to the outer surface of the oil tank 63. The lead lines of the primary winding 65, i.e., the low-voltage panel lead line 72 and the high-voltage panel lead line 77, the low-voltage panel lead line 72 is fixed to the secondary terminal plate 55, and the high-voltage panel lead line 77 is connected to the primary conductor 69.
The number of the main capacitive screen and the end screen 78 of the primary winding 65 of the oil-immersed vertical current transformer is determined by the primary rated current of the oil-immersed vertical current transformer. The sequence of the main capacitive screen from outside to inside is as follows: low pressure screen 71, respective intermediate screens 75 and high pressure screen 76; a plurality of end shields 78 between adjacent main capacitive shields are used to improve the electric field distribution of the primary winding 65. Wherein: the main capacitive screen and end screen 78 are collectively referred to as the capacitive screen of primary winding 65; and high-voltage cable paper tapes with certain thickness are stacked and wrapped between two adjacent capacitive screens according to design requirements. The adjacent capacitive screens and the high-voltage cable paper tapes between the capacitive screens, the outermost high-voltage cable paper tape 79 coated outside the low-voltage screen 71 and the outermost inner high-voltage cable paper tape 80 coated outside the high-voltage screen 76 form a primary winding main insulation 81.
In this embodiment, the defect diagnosis module 6 is further connected with an oil-immersed upright current transformer operating characteristic simulation test platform 8 in a bidirectional communication manner. If the defect diagnosis module 6 does not give the defect cause of the current transformer to be checked, the defect diagnosis module 6 sends a starting simulation test signal to the oil-immersed upright current transformer operating characteristic simulation test platform 8; after the simulation test is finished, the simulation test platform for the operating characteristics of the oil-immersed upright current transformer transmits the simulation test result of the oil-immersed upright current transformer test article 36 to the defect diagnosis module 6, and the defect diagnosis module 6 integrates the simulation test result and then transmits the defect similarity comparison result to the information output module 7.
Fig. 2 is a structural diagram of an oil-immersed upright current transformer operating characteristic simulation test platform.
As can be seen from fig. 2, the operation characteristic simulation test platform 8 for the oil-immersed vertical current transformer includes a temperature-controllable test box 35, an oil-immersed vertical current transformer sample 36 placed in the temperature-controllable test box 35, a sensor group, a current generation device, a voltage generation device, a temperature control device, and a detection device, and is used for simulating the operation conditions of the oil-immersed vertical current transformer in different environmental temperatures and temperature variation processes and under rated operation conditions, and researching the degradation development process of an insulating medium of the oil-immersed vertical current transformer.
Specifically, the oil-immersed upright current transformer operating characteristic simulation test platform 8 structurally comprises a temperature-controllable test box 35, an oil-immersed upright current transformer test sample 36 placed in the temperature-controllable test box 35, a sensor group, a current generation device, a voltage generation device, a temperature control device and a detection device, wherein the temperature control range in the temperature-controllable test box is-40 ℃ to 60 ℃.
The oil-immersed upright current transformer test article 36 is an oil-immersed upright current transformer entity device, and the structural components at least comprise: the transformer comprises a primary terminal 41, a primary winding 42, a porcelain bushing 43, a secondary terminal 44, a secondary terminal board and an oil tank 45, wherein the secondary terminal 44 is connected with a current generating device through a lead, and an oil drain valve is arranged at the bottom of the oil tank 45.
The temperature-controllable test chamber 35 is composed of a chamber body 37 and a chamber door 38, and the chamber door 38 is closed during testing, so that the inner cavity of the temperature-controllable test chamber 35 is sealed.
The box body 37 is a cuboid with a cavity, and the wall of the box body 37 consists of a metal outer plate, a heat tracing band heating layer, a metal inner plate and an insulating layer from outside to inside; a high-voltage bushing 39 is embedded in the center of the top of the box 37, the top and the bottom of the high-voltage bushing 39 are respectively connected with a smooth metal conducting rod 40, the smooth metal conducting rod 40 on the top of the high-voltage bushing 39 is connected with a voltage generating device, and the smooth metal conducting rod 40 on the bottom of the high-voltage bushing 39 is connected with a primary terminal 41 of the oil-immersed upright current transformer test piece 36.
The sensor group includes thermocouple sensor a49, thermocouple sensor B46, ultrasonic sensor 47, and uhf sensor 48. Thermocouple sensor a49 is embedded in primary winding 42, thermocouple sensor B46 is embedded in the wall of tank 37, and ultrasonic sensor 47 and uhf sensor 48 are applied to the outer surface of tank 45.
The temperature control device comprises an air compressor, an electric heating device and a box body temperature monitoring display instrument and is used for setting and controlling the temperature in the temperature-controllable test box 35, and a lead wire of the thermocouple sensor B46 is connected with a matched interface of the box body temperature monitoring display instrument.
The detection device comprises a test article outer surface temperature detection device, a test article inner temperature detection device, an insulation performance detection device and a discharge signal detection device. Wherein, the device for detecting the outer surface temperature of the test sample comprises an infrared thermal imager and a picture processing instrument. The device for detecting the internal temperature of the test sample comprises a temperature monitor, and a lead wire of a thermocouple sensor A49 is connected with a matched interface of the temperature monitor. The insulation performance detection device at least comprises a dissolved gas detector in oil, an insulating oil voltage withstand detector, an insulating oil moisture detector, an insulating resistance tester and a dielectric loss factor tester. The discharge signal detection device at least comprises an ultrahigh frequency partial discharge detector and an ultrasonic partial discharge detector, wherein a guide line of the ultrahigh frequency sensor 48 is connected with a matched interface of the ultrahigh frequency partial discharge detector, and a guide line of the ultrasonic sensor 47 is connected with the ultrasonic partial discharge detector through a preamplifier.
Therefore, the oil-immersed vertical current transformer operation characteristic simulation test platform is provided with the temperature control device, the outer surface temperature detection device, the test article internal temperature detection device, the insulation performance detection device and the discharge signal detection device, so that the real-time monitoring of the operation state of the oil-immersed vertical current transformer in different environments between 40 ℃ below zero and 60 ℃ can be realized, and the electrical performance of the oil-immersed vertical current transformer can be tested and evaluated. Namely: the oil-immersed upright current transformer operation characteristic simulation test platform can be used for researching the development process of defects such as 'non-vacuum oil injection' defect, 'insufficient drying' and the like introduced in the process manufacturing process. Namely: the defect generation and development process caused by improper process factors and process implementation is brought into the research range for the first time, and the defect causes are not limited to the operation of the power transformer any more.
In this embodiment, specifically, the simulation test platform 8 transmits the simulation test result of the oil-immersed upright current transformer test sample to the defect diagnosis module 6, and the defect diagnosis module 6 integrates the simulation test result and then transmits the defect similarity comparison result to the information output module 7. Namely: after the two systems (or platforms) are in butt joint, the simulation result of the simulation test platform 8 can be compared with the test and detection results of the mutual inductor to be checked or the oil-immersed upright current transformer running on site, so that the cause of the defect or fault oil-immersed upright current transformer can be deduced, and the completeness of the checking process of the defect checking of the oil-immersed upright current transformer is improved.
Claims (7)
1. The oil-immersed upright current transformer defect troubleshooting system is characterized by comprising an information input module (1), a testing device (2), a sample detection device (3), a central processing module (4), a disassembly process recording module (5), a defect diagnosis module (6) and an information output module (7);
recording the oil immersed upright current transformer to be checked as a transformer to be checked;
the information input module (1) is unidirectionally connected with the central processing module (4) and the disassembling process recording module (5), transmits the structural information, the defect information and the historical test data of the mutual inductor to be checked to the central processing module (4), and transmits the structural information of the mutual inductor to be checked to the disassembling process recording module (5);
the test device (2) comprises at least: the device comprises an insulation resistance tester (21), a direct current resistance tester (22), a high-voltage dielectric loss and capacitance tester (23), a partial discharge tester (24), an oil dissolved gas tester (25), an oil moisture content tester (26) and an oil voltage withstand detector (27), wherein the insulation resistance tester (21), the direct current resistance tester (22), the high-voltage dielectric loss and capacitance tester (23) and the partial discharge tester (24) are used for testing electrical parameters of the mutual inductor to be inspected, and the oil dissolved gas tester (25), the oil moisture content tester (26) and the oil voltage withstand detector (27) are used for detecting the insulating oil performance of the mutual inductor to be inspected; the testing device (2) is unidirectionally connected with the central processing module (4) and is used for transmitting the testing and detecting results of the testing device (2) to the central processing module (4);
the sample detection device (3) is bidirectionally connected with the disassembling process recording module (5), receives disassembling, detecting and sampling commands of the disassembling process recording module (5), photographs the disassembling process and detects the taken sample according to the disassembling and inspecting steps of the mutual inductor to be inspected, which are prestored in the disassembling process recording module (5), and transmits the photographed photographs and sample detection information to the disassembling process recording module (5); the sample detection device (3) comprises a camera (31), a microscope scanner (32), an element energy spectrum analyzer (33) and a temperature-controllable sample soaking device (34) and is used for shooting a to-be-inspected mutual inductor disassembling process and detecting a sample taken in the to-be-inspected mutual inductor disassembling process;
the disassembly process recording module (5) is connected with the sample detection device (3) in a bidirectional way and is connected with the defect diagnosis module (6) in a unidirectional way; the disassembly process recording module (5) sends disassembly, detection and sampling commands to the sample detection device (3) according to the pre-stored disassembly and investigation steps of the mutual inductor to be investigated, receives pictures and sample detection information obtained by the sample detection device (3), and transmits the integrated disassembly information to the defect diagnosis module (6) after matching and corresponding to the disassembly steps of the mutual inductor to be investigated;
the central processing module (4) is unidirectionally connected with the information input module (1), the test device (2) and the defect diagnosis module (6); the central processing module (4) receives the information transmitted by the information input module (1) and the testing device (2), screens and combs the information, and then transmits effective information obtained after screening and combing of the mutual inductor to be inspected to the defect diagnosis module (6);
the defect diagnosis module (6) is unidirectionally connected with the central processing module (4), the disassembly process recording module (5) and the information output module (7); the defect diagnosis module (6) receives effective information of the mutual inductor to be checked after screening and combing, which is transmitted by the central processing module (4), receives disassembly information integrated by the disassembly process recording module (5), analyzes and diagnoses the defect cause of the mutual inductor to be checked, and transmits the defect cause to the information output module (7).
2. The oil immersed vertical current transformer defect checking system according to claim 1, wherein the information input module (1) and the information output module (7) are connected with a power company production management system (9) through an internal network.
3. The oil-immersed vertical current transformer defect inspection system according to claim 1, wherein the test device (2) further comprises an insulating paper moisture content test device, an insulating oil pour point detector, a flash point detector and an acid value detector.
4. The oil-immersed upright current transformer defect inspection system according to claim 1, wherein the sample detection device (3) further comprises a furfural content detector and an insulating paper moisture content detector.
5. The oil-immersed upright current transformer defect inspection system according to claim 1, wherein the step of disassembling and inspecting the transformer to be inspected comprises the steps of:
step 1, collecting structural information of a mutual inductor to be checked;
step 2, developing a diagnostic test before disassembling the mutual inductor to be checked;
step 3, disassembling the mutual inductor to be inspected, and gradually inspecting defects;
step 3.1, checking the sealing condition and emptying the insulating oil;
step 3.2, separating the body;
step 3.3, disassembling the body and gradually checking the defects of the body;
step 3.4, measuring the size of the primary conductor;
step 4, calculating and checking the actually measured inter-screen capacitance between the adjacent main capacitive screens;
and 5, detecting the samples taken in the step 2 and the step 3.
6. The oil-immersed upright current transformer defect troubleshooting system of claim 1, characterized in that the defect diagnosis module (6) is further in bidirectional communication connection with an oil-immersed upright current transformer operating characteristic simulation test platform (8); if the defect diagnosis module (6) does not give the defect cause of the current transformer to be checked, the defect diagnosis module (6) sends a starting simulation test signal to the oil-immersed upright current transformer operation characteristic simulation test platform (8); after the simulation test is finished, the simulation test platform (8) transmits the simulation test result of the oil-immersed vertical current transformer test sample to the defect diagnosis module (6), and the defect diagnosis module (6) transmits the defect similarity comparison result to the information output module (7) after integrating the simulation test result.
7. The oil-immersed vertical current transformer defect troubleshooting system of claim 5, characterized in that the oil-immersed vertical current transformer operating characteristic simulation test platform (8) comprises a temperature-controllable test box (35), an oil-immersed vertical current transformer test article (36) placed in the temperature-controllable test box (35), a sensor group, a current generating device, a voltage generating device, a temperature control device and a detection device, and is used for simulating operating conditions of the oil-immersed vertical current transformer in different environmental temperatures and temperature variation processes and under rated operating conditions, and researching the degradation development process of an insulating medium of the oil-immersed vertical current transformer.
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