A solution and system for analyzing abnormal noises in transformers

Abstract

This invention discloses a method and system for analyzing abnormal noise in transformers. The method includes: establishing a transformer simulation model; determining the transformer's simulation operating parameters based on the simulation model; obtaining the transformer's actual operating parameters; determining the cause of the abnormal noise based on the actual operating parameters and the simulation operating parameters; determining a preliminary solution based on the cause of the abnormal noise; verifying the correctness of the preliminary solution using the transformer simulation model; and if correct, determining a final rectification plan based on the preliminary solution. By adopting the above method, the problem of how to quickly analyze the cause of abnormal noise in transformers and determine a solution is solved.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and in particular to a solution and system for analyzing abnormal noises in transformers. Background Technology

[0002] As one of the three power sources in a nuclear power plant, and also the earliest available commissioning power source, the transformer provides power for the commissioning of downstream process systems in the early stages of unit commissioning. Its stability directly affects the progress of commissioning work.

[0003] However, during the initial energization of a nuclear power plant transformer, a clanging noise was emitted during the switching process, severely impacting its stable operation. Therefore, quickly analyzing the cause of the noise, determining its source, and clarifying whether it affects the long-term stable operation of the transformer are crucial. Furthermore, existing technologies, even after analyzing the cause of the noise, struggle to quickly determine a solution.

[0004] In summary, how to quickly analyze the cause of abnormal noise in a transformer and determine a solution is an urgent problem to be solved. Summary of the Invention

[0005] This invention provides a method and system for analyzing abnormal noises in transformers, addressing the urgent problem of how to quickly analyze the causes of abnormal noises in transformers and determine solutions.

[0006] According to one aspect of the present invention, a solution for analyzing abnormal noise in transformers is provided, the solution comprising:

[0007] Establish a transformer simulation model;

[0008] The simulation operating parameters of the transformer are determined based on the transformer simulation model.

[0009] Obtain the actual operating parameters of the transformer;

[0010] The cause of the abnormal noise was determined based on the actual operating parameters and the simulated operating parameters.

[0011] A preliminary solution was determined based on the cause of the abnormal noise.

[0012] The correctness of the preliminary solution was verified using the transformer simulation model.

[0013] If correct, determine the final rectification plan based on the preliminary solution.

[0014] In an optional embodiment of the present invention, the actual operating parameters include the measured waveform of the high-voltage side voltage, and the simulated operating parameters include the simulated waveform of the high-voltage side voltage; determining the cause of the abnormal noise based on the actual operating parameters and the simulated operating parameters includes:

[0015] The cause of the abnormal noise was determined based on the measured waveform of the high-voltage side voltage and the simulated waveform of the high-voltage side voltage.

[0016] In an optional embodiment of the present invention, determining the cause of the abnormal noise based on the measured waveform of the high-voltage side voltage and the simulated waveform of the high-voltage side voltage includes:

[0017] Determine whether the measured waveform of the high-voltage side voltage and the simulated waveform of the high-voltage side voltage exhibit a flat-top characteristic;

[0018] If so, the cause of the abnormal noise is determined to be excessive capacitance to ground.

[0019] In an optional embodiment of the present invention, determining a preliminary solution based on the cause of the abnormal noise includes:

[0020] When the cause of the abnormal noise is excessive capacitance to ground, the preliminary solution is to connect a parallel reactor to reduce the capacitance to ground.

[0021] Accordingly, verifying the correctness of the preliminary solution using the transformer simulation model includes:

[0022] In the transformer simulation model, a parallel reactor is connected, and it is determined whether the flat-top characteristic of the high-voltage side voltage simulation waveform disappears.

[0023] If so, the preliminary solution is confirmed to be correct;

[0024] If not, the preliminary solution is incorrect.

[0025] In an optional embodiment of the present invention, determining the final rectification plan based on the preliminary solution includes:

[0026] Obtain measured data and / or simulation data of transformer rectification after implementing the preliminary solution;

[0027] The final rectification plan is determined based on the measured data of the transformer rectification and / or the simulation data of the transformer rectification.

[0028] In an optional embodiment of the present invention, the measured data of transformer rectification includes the measured waveform of the high-voltage side rectification voltage, and the simulation data of transformer rectification includes the simulation waveform of the high-voltage side rectification voltage; determining the final rectification plan based on the measured data of transformer rectification and / or the simulation data of transformer rectification includes:

[0029] If neither the measured waveform of the high-voltage side rectification voltage nor the simulated waveform of the high-voltage side rectification voltage exhibits a flat-top characteristic, the preliminary solution will be determined as the final rectification solution.

[0030] In an optional embodiment of the present invention, the measured data of transformer rectification further includes measured abnormal noise information; the step of determining the final rectification plan based on the measured data of transformer rectification and / or the simulation data of transformer rectification includes:

[0031] If no abnormal noise is detected in the measured noise information, the preliminary solution will be determined as the final rectification solution.

[0032] In an optional embodiment of the present invention, establishing the transformer simulation model includes:

[0033] Obtain the parameters for building the transformer model;

[0034] Based on the parameters established by the transformer model, a transformer simulation model was built in the PSCAD / EMTDC environment.

[0035] According to another aspect of the present invention, a transformer abnormal noise analysis and solution system is provided, the transformer abnormal noise analysis and solution system comprising a transformer body, a monitoring device, a fault analysis device, and a simulation device;

[0036] The monitoring device is used to monitor the actual operating parameters of the transformer body;

[0037] The simulation device is used to establish a transformer simulation model;

[0038] The first input terminal of the fault analysis device is electrically connected to the monitoring device, and the second input terminal of the fault analysis device is electrically connected to the simulation device. The fault analysis device is used to execute the transformer abnormal noise analysis and solution method described in any embodiment of the present invention.

[0039] In an optional embodiment of the present invention, the monitoring device includes at least one of the following:

[0040] A current and voltage monitoring module is used to monitor at least one of the transformer high-voltage side voltage, transformer high-voltage side current, and transformer low-voltage side voltage of the transformer body.

[0041] A partial discharge monitoring module is used to monitor the partial discharge level of the transformer body.

[0042] The sound monitoring module is used to monitor the abnormal noise information of the transformer body.

[0043] The technical solution of this invention involves establishing a transformer simulation model; determining the transformer's simulation operating parameters based on the model; obtaining the transformer's actual operating parameters; determining the cause of abnormal noise based on both the actual and simulation parameters; determining a preliminary solution based on the cause; verifying the correctness of the preliminary solution using the transformer simulation model; and finally, if correct, determining a final rectification plan based on the preliminary solution. This method enables rapid analysis of the cause of transformer abnormal noise and allows for prior verification of the preliminary solution within the transformer simulation model. Only when the preliminary solution is correct is the final rectification plan determined, saving manpower costs. Therefore, it solves the problem of how to quickly analyze the cause of transformer abnormal noise and determine a solution.

[0044] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a flowchart of a transformer noise analysis and solution provided in Embodiment 1 of the present invention;

[0047] Figure 2 for Figure 1 Flowchart of the steps for establishing a transformer simulation model;

[0048] Figure 3 This is a flowchart of a transformer noise analysis and solution provided in Embodiment 2 of the present invention;

[0049] Figure 4 This is a flowchart of a transformer noise analysis and solution provided in Embodiment 3 of the present invention;

[0050] Figure 5 This is the measured waveform of the high-voltage side voltage of the transformer;

[0051] Figure 6 The simulated waveform of the high-voltage side voltage of the transformer;

[0052] Figure 7 An ultrasonic waveform obtained from monitoring the sound of a transformer;

[0053] Figure 8 This is the measured waveform of the high-voltage side voltage after the transformer is connected to a parallel reactor;

[0054] Figure 9 The simulated waveform of the high-voltage side voltage after the transformer is connected in parallel with a reactor;

[0055] Figure 10 This is a waveform of the ultrasonic signal obtained by monitoring the sound of the transformer after connecting a reactor in parallel with the transformer.

[0056] Figure 11 This is a circuit block diagram of a transformer noise analysis and solution system provided in Embodiment 4 of the present invention;

[0057] Figure 12 A schematic diagram of a transformer noise analysis and solution system provided in Embodiment 4 of the present invention;

[0058] Figure 13 A schematic diagram of the high-voltage side of a transformer for a transformer noise analysis and solution system provided in Embodiment 4 of the present invention;

[0059] Figure 14 This is a schematic diagram of the low-voltage side of a transformer in a transformer noise analysis and solution system provided in Embodiment 4 of the present invention;

[0060] Figure 15 The circuit diagram of a transformer noise analysis and solution system provided for embodiment four of the present invention is shown below.

[0061] The components include: 1. Transformer body; 11. Low-voltage side; 12. High-voltage side end screen; 13. High-voltage secondary side terminal; 14. Low-voltage secondary side terminal; 16. Transformer oil tank; 161. Low-voltage side oil tank; 162. High-voltage side oil tank; 2. Compensation module; 21. Reactor; 3. Switch module; 4. Low-voltage side grounding wire; 5. Monitoring device; 51. Current and voltage monitoring module; 52. Partial discharge monitoring module; 53. Sound monitoring module; 6. Core grounding wire; 7. Fault analysis device; 8. Simulation device. Detailed Implementation

[0062] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0063] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0064] Example 1

[0065] Figure 1 This is a flowchart illustrating a transformer noise analysis and solution method according to Embodiment 1 of the present invention. This embodiment is applicable to situations where transformers produce abnormal noise. The transformer noise analysis and solution system may include a fault analysis device. This method can be executed by the fault analysis device of the transformer noise analysis and solution system. The fault analysis device can be implemented in hardware and / or software. Figure 1 As shown, the solutions for abnormal noise from this transformer include:

[0066] S110. Establish a transformer simulation model.

[0067] A transformer simulation model is a model capable of simulating a transformer and the system in which it is applied, in order to verify the actual state of the system. A transformer simulation model can include a simplified 220kV power grid system, 220kV high-voltage cables, transformers, etc., thereby simulating the actual state of the system within the transformer simulation model.

[0068] S120. Determine the simulation operating parameters of the transformer based on the transformer simulation model.

[0069] Among them, the simulation operating parameters refer to the operating parameters obtained by the transformer simulation model during transformer operation.

[0070] S130. Obtain the actual operating parameters of the transformer.

[0071] The actual operating parameters of a transformer refer to the values ​​of various parameters obtained from actual testing of the transformer during its operation, such as current, voltage, and partial discharge.

[0072] S140. Determine the cause of the abnormal noise based on the actual operating parameters and the simulated operating parameters.

[0073] When a transformer malfunctions and produces abnormal noises, the actual operating parameters will differ from the standard parameters. If the transformer simulation model is correct, the simulation operating parameters should be the same as the actual operating parameters. Therefore, comparing the actual operating parameters and the simulation operating parameters can verify the correctness of the transformer simulation model. The simulation operating parameters also reflect the transformer's fault condition; therefore, the cause of the abnormal noise can be determined based on the actual operating parameters and the simulation operating parameters.

[0074] S150. Determine a preliminary solution based on the cause of the abnormal noise.

[0075] The preliminary solution refers to a solution that has been preliminarily determined to resolve the abnormal noise from the transformer.

[0076] S160. Verify the correctness of the preliminary solution using the transformer simulation model.

[0077] Since the transformer simulation model is a model that can simulate the transformer and the system on which the transformer is applied to verify the actual state of the system on which the transformer is applied, a preliminary solution can be implemented in the transformer simulation model before formal implementation. The transformer simulation model is used to verify in advance whether this preliminary solution can restore the simulation operation parameters to normal. If it can, it means that the preliminary solution is correct; if it cannot, it means that the preliminary solution is wrong.

[0078] If correct, proceed to step S170; if incorrect, proceed to step S120 to re-determine the transformer's simulation operating parameters so that the cause of the abnormal noise can be determined again based on the actual operating parameters and the simulation operating parameters. Alternatively, proceed to step S150 to determine other preliminary solutions.

[0079] S170. Determine the final rectification plan based on the preliminary solution.

[0080] The final rectification plan refers to the solution to the abnormal noise that is finally implemented on-site. By verifying the correctness of the preliminary solution in the transformer simulation model in advance, the final rectification plan is determined based on the preliminary solution only if the preliminary solution is correct, which can save manpower costs.

[0081] The above solution involves establishing a transformer simulation model; determining the transformer's simulation operating parameters based on the model; obtaining the transformer's actual operating parameters; then determining the cause of the abnormal noise based on both the actual and simulation parameters; determining a preliminary solution based on the cause; verifying the correctness of the preliminary solution using the transformer simulation model; and finally, if correct, determining the final rectification plan based on the preliminary solution. This method can quickly analyze the cause of transformer abnormal noise and, after determining the preliminary solution, can verify its correctness within the transformer simulation model beforehand. Only when the preliminary solution is correct is the final rectification plan determined, saving manpower costs. Therefore, it solves the problem of how to quickly analyze the cause of transformer abnormal noise and determine the solution.

[0082] In optional embodiments of the present invention, such as Figure 2 As shown, the establishment of the transformer simulation model includes:

[0083] S111, Obtain the parameters for establishing the transformer model.

[0084] Among them, transformer model establishment parameters refer to the actual parameters of the transformer required to build a transformer simulation model. These include parameters of various transformer components, the composition and related parameters of the system in which the transformer operates, and the actual parameters of the transformer can be read through a system electrical connection with the operating parameters of the actual tested transformer. For example, the system used by the transformer includes a simplified 220kV power grid system, 220kV high-voltage cables, and the transformer itself. The transformer model establishment parameters include the connection relationships between the simplified 220kV power grid system, the 220kV high-voltage cables, and the transformer, as well as various parameters of these components.

[0085] S112. Based on the parameters established by the transformer model, a transformer simulation model is built in the PSCAD / EMTDC environment.

[0086] PSCAD / EMTDC, short for Power Systems Computer Aided Design, is a widely used electromagnetic transient simulation software worldwide. EMTDC is its core simulation calculation tool, and PSCAD provides a graphical user interface for EMTDC (Electromagnetic Transients including DC). Therefore, using PSCAD / EMTDC, a transformer simulation model can be easily built given the transformer model's parameters.

[0087] Example 2

[0088] Figure 3This is a flowchart illustrating a transformer abnormal noise analysis and solution method provided in Embodiment 2 of the present invention. This embodiment is an improvement upon Embodiment 1, and optionally, the actual operating parameters include the measured waveform of the high-voltage side voltage, and the simulated operating parameters include the simulated waveform of the high-voltage side voltage. Determining the cause of the abnormal noise based on the actual operating parameters and the simulated operating parameters includes: determining the cause of the abnormal noise based on the measured waveform of the high-voltage side voltage and the simulated waveform of the high-voltage side voltage. For example... Figure 3 As shown, the solutions for abnormal noise from this transformer include:

[0089] S210. Establish a transformer simulation model.

[0090] S220. Determine the simulation operating parameters of the transformer based on the transformer simulation model.

[0091] S230. Obtain the actual operating parameters of the transformer.

[0092] S240. Determine the cause of the abnormal noise based on the measured waveform of the high-voltage side voltage and the simulated waveform of the high-voltage side voltage.

[0093] The measured high-voltage side voltage waveform refers to the voltage waveform of the transformer's high-voltage side obtained from actual testing, while the simulated high-voltage side voltage waveform refers to the voltage waveform of the transformer's high-voltage side obtained through transformer simulation modeling. If the measured and simulated high-voltage side voltage waveforms are consistent, it indicates the correctness of the transformer simulation model. During normal transformer operation, both the measured and simulated high-voltage side voltage waveforms should be consistent with the standard waveform. If the measured and simulated high-voltage side voltage waveforms differ from the standard waveform, this difference may be due to the same cause as abnormal transformer noise, reflecting the reason for the transformer's abnormality. Therefore, the cause of the abnormal noise can be determined based on the measured and simulated high-voltage side voltage waveforms.

[0094] S250. Determine a preliminary solution based on the cause of the abnormal noise.

[0095] S260. Verify the correctness of the preliminary solution using the transformer simulation model.

[0096] If correct, proceed to step S270; if incorrect, proceed to step S280 to re-determine the transformer's simulation operating parameters so that the cause of the abnormal noise can be determined again based on the actual operating parameters and the simulation operating parameters. Alternatively, proceed to step S250 to determine other preliminary solutions.

[0097] S270. Determine the final rectification plan based on the preliminary solution.

[0098] Based on the above embodiments, determining the cause of the abnormal noise based on the measured waveform of the high-voltage side voltage and the simulated waveform of the high-voltage side voltage includes:

[0099] Determine whether the measured waveform of the high-voltage side voltage and the simulated waveform of the high-voltage side voltage exhibit a flat-top characteristic.

[0100] If so, the cause of the abnormal noise is determined to be excessive capacitance to ground.

[0101] The measured and simulated waveforms of the high-voltage side voltage both exhibit a flat-top characteristic, indicating that the 220kV high-voltage cable is relatively long and has a large capacitance to ground. This leads to transformer saturation, generating pulse currents. These pulse currents cause core jerking within the transformer, resulting in abnormal noise. Therefore, the cause of the abnormal noise can be determined to be excessive capacitance to ground.

[0102] If neither the measured waveform of the high-voltage side voltage nor the simulated waveform of the high-voltage side voltage shows a flat-top characteristic, it indicates that there is no problem with the high-voltage side voltage. At this time, the waveforms of the high-voltage side current, low-voltage side current, and low-voltage side voltage can be obtained to determine the cause of the abnormal noise from the transformer.

[0103] Example 3

[0104] Figure 4 This is a flowchart illustrating a transformer noise analysis and solution method provided in Embodiment 3 of the present invention. This embodiment is an improvement upon Embodiment 2. Optionally, determining a preliminary solution based on the cause of the noise includes: if the cause of the noise is excessive ground capacitance, determining a preliminary solution is to connect a parallel reactor to reduce the ground capacitance. Correspondingly, verifying the correctness of the preliminary solution using the transformer simulation model includes: connecting a parallel reactor in the transformer simulation model and determining whether the flat-top characteristic of the high-voltage side voltage simulation waveform disappears. If yes, the preliminary solution is determined to be correct. If not, the preliminary solution is determined to be incorrect. Figure 4 As shown, the solutions for abnormal noise from this transformer include:

[0105] S310. Establish a transformer simulation model.

[0106] S320. Determine the simulation operating parameters of the transformer based on the transformer simulation model.

[0107] S330. Obtain the actual operating parameters of the transformer.

[0108] S340. Determine the cause of the abnormal noise based on the measured waveform of the high-voltage side voltage and the simulated waveform of the high-voltage side voltage.

[0109] S350. When the cause of the abnormal noise is excessive capacitance to ground, the preliminary solution is to connect a parallel reactor to reduce the capacitance to ground.

[0110] The measured and simulated waveforms of the high-voltage side voltage exhibit a flat-top characteristic, indicating that the 220kV high-voltage cable is relatively long and has a large capacitance to ground, leading to transformer saturation and the generation of pulse currents. These pulse currents cause core jerking within the transformer, resulting in abnormal noise. Therefore, the cause of the abnormal noise can be determined to be excessive capacitance to ground. Thus, the problem can be resolved by connecting a parallel reactor to reduce the capacitance to ground.

[0111] S360. Connect a reactor in parallel in the transformer simulation model and determine whether the flat-top feature of the high-voltage side voltage simulation waveform disappears.

[0112] In this process, by connecting a reactor in parallel in the transformer simulation model, the ground capacitance of the system to which the transformer is applied in the transformer simulation model can be reduced. At this time, by determining whether the flat-top characteristic of the high-voltage side voltage simulation waveform disappears, it can be determined whether the method of connecting the reactor can restore the high-voltage side voltage simulation waveform to normal, and thus determine whether the anomaly has been resolved.

[0113] If the noise disappears, the preliminary solution is confirmed to be correct, and step S370 is executed. If the noise does not disappear, the preliminary solution is incorrect, and step S320 is executed to re-determine the transformer's simulation operating parameters so that the cause of the abnormal noise can be determined again based on the actual operating parameters and the simulation operating parameters. Alternatively, step S350 can be executed to determine other preliminary solutions.

[0114] S370. Determine the final rectification plan based on the preliminary solution.

[0115] The above-mentioned method can quickly determine the cause of abnormal noise and find a preliminary solution to resolve the noise, thus solving the problem of how to quickly analyze the cause of transformer abnormal noise and determine the solution.

[0116] In an optional embodiment of the present invention, determining the final rectification plan based on the preliminary solution includes:

[0117] Obtain measured data and / or simulated data of transformer rectification after implementing the preliminary solution.

[0118] The final rectification plan is determined based on the measured data of the transformer rectification and / or the simulation data of the transformer rectification.

[0119] Among them, the measured data of transformer rectification refers to the data obtained by actually testing the transformer after implementing the preliminary solution, and the simulation data of transformer rectification refers to the data obtained by simulating the transformer through the transformer simulation model after implementing the preliminary solution.

[0120] The effectiveness of the preliminary on-site solution can be determined by using the measured data and / or simulation data of the transformer rectification, thereby determining the final rectification plan. Furthermore, since both the measured data and simulation data reflect the actual operating condition of the transformer, a judgment can be made using either the measured data or the simulation data alone, or by combining both.

[0121] Based on the above embodiments, the measured data for transformer rectification includes the measured waveform of the high-voltage side rectification voltage, and the simulation data for transformer rectification includes the simulation waveform of the high-voltage side rectification voltage; determining the final rectification plan based on the measured data and / or the simulation data for transformer rectification includes:

[0122] If neither the measured waveform of the high-voltage side rectification voltage nor the simulated waveform of the high-voltage side rectification voltage exhibits a flat-top characteristic, the preliminary solution will be determined as the final rectification solution.

[0123] The measured and simulated waveforms of the high-voltage side voltage exhibit a flat-top characteristic, indicating that the 220kV high-voltage cable is relatively long and has a large capacitance to ground, leading to transformer saturation and the generation of pulse currents. These pulse currents cause core jerking within the transformer, resulting in abnormal noise. Therefore, when the measured and simulated waveforms of the high-voltage side rectification voltage do not show a flat-top characteristic, it indicates that the capacitance to ground is no longer excessive, and the transformer is less likely to saturate and cause abnormal noise. This means that the preliminary solution effectively addresses the problem of excessive capacitance to ground and can be considered the final rectification solution.

[0124] In an optional embodiment of the present invention, the measured data of transformer rectification further includes measured abnormal noise information; the step of determining the final rectification plan based on the measured data of transformer rectification and / or the simulation data of transformer rectification includes:

[0125] If no abnormal noise is detected in the measured noise information, the preliminary solution will be determined as the final rectification solution.

[0126] The measured abnormal noise information includes whether the transformer still has abnormal noise as determined by actual testing. This can be determined by measuring the transformer using an ultrasonic sensor. If the transformer does not have abnormal noise, it means that the preliminary solution can effectively solve the transformer noise problem, and it can be determined as the final rectification solution.

[0127] The following specific embodiment illustrates the specific steps of the present invention: monitoring the actual operating parameters of the transformer to obtain the actual operating parameters of the transformer, and establishing a transformer simulation model to simulate the transformer and obtain the simulation operating parameters.

[0128] Simulate the high-voltage side voltage of a transformer using a transformer simulation model. Figure 5 This is the measured waveform of the high-voltage side voltage of the transformer. Figure 6 The high-voltage side voltage waveform of the transformer is simulated and analyzed comprehensively. Figure 5 and Figure 6 The waveform trends and characteristics show that the measured waveform of the high-voltage side voltage and the simulated waveform of the high-voltage side voltage are consistent, indicating the correctness of the transformer simulation model. Furthermore, both the measured and simulated waveforms of the high-voltage side voltage exhibit a flat-top characteristic, suggesting that the 220kV high-voltage cable is relatively long and has a large capacitance to ground, leading to transformer saturation and the generation of pulse currents. These pulse currents cause core jerking within the transformer, resulting in abnormal noise. Figure 7 The ultrasonic signal waveform obtained from monitoring the sound of the transformer was generated by... Figure 7 It can be seen that the ultrasonic sensor showed an abnormal surge in signal after the transformer was tripped, indicating that there was an abnormal noise from the transformer.

[0129] Once the abnormal noise is determined to be caused by excessive capacitance to ground, a parallel reactor is first connected in the transformer simulation model to compensate for the capacitance to ground generated by the 220kV high-voltage cable. After confirming in the transformer simulation model that the parallel reactor can compensate for the capacitance to ground generated by the 220kV high-voltage cable, it is implemented on-site.

[0130] Figure 8 This is the measured waveform of the high-voltage side voltage after the transformer is connected in parallel with a reactor. Figure 9 The simulated waveform of the high-voltage side voltage after the transformer is connected to the parallel reactor is generated by... Figure 8 and Figure 9 It can be seen that neither the measured waveform of the high-voltage side rectification voltage nor the simulated waveform of the high-voltage side rectification voltage showed a flat-top characteristic. Figure 10 This is a waveform of the ultrasonic signal obtained by monitoring the sound of the transformer after connecting a reactor in parallel with the transformer, such as... Figure 10 As shown, when monitoring abnormal noise inside the transformer with the same ultrasonic sensor, the signal peak value decreased significantly and there were no sudden increases. This indicates that connecting a shunt reactor to the transformer to compensate for the capacitance to ground can effectively solve the transformer noise problem. Therefore, the final rectification solution can be determined as connecting a shunt reactor.

[0131] Example 4

[0132] Embodiment 4 of the present invention provides a transformer abnormal noise analysis and solution system, such as... Figure 11As shown, the transformer noise analysis and solution system includes the transformer body 1, monitoring device 5, fault analysis device 7, and simulation device 8.

[0133] Monitoring device 5 is used to monitor the actual operating parameters of transformer body 1.

[0134] Simulation device 8 is used to establish a transformer simulation model.

[0135] The first input terminal of the fault analysis device 7 is electrically connected to the monitoring device 5, and the second input terminal of the fault analysis device 7 is electrically connected to the simulation device 8. The fault analysis device 7 is used to execute the transformer abnormal noise analysis and solution method of any embodiment of the present invention.

[0136] A transformer is a device that uses the principle of electromagnetic induction to change alternating current voltage. Its main components are the primary coil, the secondary coil, and the iron core (magnetic core). The transformer body 1 is the main part of the transformer.

[0137] The monitoring device 5 refers to a device capable of monitoring the actual operating parameters of the transformer body 1. Preferably, the actual operating parameters include at least one of the following: transformer high-voltage side voltage, transformer high-voltage side current, transformer low-voltage side voltage, partial discharge quantity, and noise information. Transformer high-voltage side voltage refers to the voltage value on the high-voltage side of the transformer; transformer high-voltage side current refers to the current value on the high-voltage side of the transformer; transformer low-voltage side voltage refers to the voltage value on the low-voltage side of the transformer; partial discharge refers to electrical discharge in which part of the equipment's insulation system is broken down; this discharge can occur near conductors (electrodes) or in other locations; partial discharge quantity refers to the discharge occurring in a localized area of ​​the transformer; and noise information refers to information about whether the transformer is making abnormal noises. By monitoring the transformer body 1 through the monitoring device 5, the actual operating parameters of the transformer can be easily obtained, thereby enabling the determination of whether the transformer has a fault and the cause of the fault.

[0138] Simulation device 8 refers to a device capable of establishing a transformer simulation model and simulating the transformer's operating system. The transformer simulation model may include a simplified 220kV power grid system, 220kV high-voltage cables, and the transformer itself. By comparing actual operating parameters with simulated operating parameters, it can be determined whether simulation device 8 can accurately reflect the actual operating conditions of the transformer and whether the obtained simulated operating parameters closely match the actual situation. After a fault occurs and corrective measures are determined, the effectiveness of the corresponding corrective measures can be determined first through simulation device 8 before actual application, which can reduce costs.

[0139] The above-described solution allows the fault analysis device 7 to quickly analyze the causes of abnormal transformer noise based on actual and simulated operating parameters. Furthermore, after determining a preliminary solution, it can verify the correctness of the preliminary solution within the transformer simulation model beforehand. Only if the preliminary solution is correct is the final rectification plan determined, thus saving manpower costs. Therefore, it effectively solves the problem of how to quickly analyze the causes of abnormal transformer noise and determine solutions.

[0140] In optional embodiments of the present invention, such as Figures 11-13 As shown, the monitoring device 5 includes a current and voltage monitoring module 51, which is used to monitor at least one of the transformer high-voltage side voltage, transformer high-voltage side current and transformer low-voltage side voltage of the transformer body 1.

[0141] Among them, the current and voltage monitoring module 51 refers to a module that can monitor the current value and / or voltage value. Therefore, the current and voltage monitoring module 51 can monitor at least one of the transformer high-voltage side voltage, transformer high-voltage side current and transformer low-voltage side voltage of the transformer body 1.

[0142] Based on the above embodiments, the current and voltage monitoring module 51 includes a waveform recorder, and the transformer body 1 includes a high-voltage side end screen 12, a high-voltage secondary side terminal 13, and a low-voltage side secondary side terminal 14; the waveform recorder is electrically connected to at least one of the high-voltage side end screen 12, the high-voltage secondary side terminal 13, and the low-voltage side secondary side terminal 14 to monitor at least one of the transformer high-voltage side voltage, the transformer high-voltage side current, and the transformer low-voltage side voltage during the switching process.

[0143] The measurement signal can be led out from the high-voltage side end screen 12 of the transformer body 1 and introduced into the waveform recorder via a shielded coaxial cable, so that the waveform recorder can directly measure the high-voltage side voltage of the transformer during the switching process.

[0144] The high-voltage secondary side terminal 13 of the transformer body 1 can be connected to the waveform recorder via a test cable, so that the waveform recorder can directly measure the high-voltage side current of the transformer during the switching process.

[0145] The waveform recorder can be connected to the low-voltage secondary side terminal 14 of the transformer body 1 via a test cable, so that the waveform recorder can directly measure the low-voltage side voltage of the transformer during the switching process.

[0146] By simply connecting the waveform recorder to different locations on the transformer body 1, at least one of the high-voltage side voltage, high-voltage side current, and low-voltage side voltage of the transformer can be measured during the switching process.

[0147] In optional embodiments of the present invention, such as Figure 14As shown, the monitoring device 5 includes a partial discharge monitoring module 52, which is used to monitor the partial discharge of the transformer body 1.

[0148] Among them, the partial discharge monitoring module 52 refers to a module that can monitor the partial discharge of the transformer body 1.

[0149] Based on the above embodiments, the partial discharge monitoring module 52 includes a current transformer, and the transformer body 1 also includes an iron core, which is electrically connected to an iron core grounding wire 6; the current transformer is installed on the iron core grounding wire 6 to monitor the partial discharge of the transformer body 1.

[0150] Among them, the current transformer is an instrument that converts a large primary current into a small secondary current based on the principle of electromagnetic induction for measurement. Specifically, the current transformer can be a high-frequency clamp-on current transformer. By installing the current transformer on the core grounding wire 6, the high-frequency component of the grounding current of the core and clamping parts can be measured, and the partial discharge quantity can be monitored.

[0151] In optional embodiments of the present invention, such as Figure 12 and Figure 13 As shown, the monitoring device 5 includes a sound monitoring module 53, which is used to monitor the noise information of the transformer body 1.

[0152] Among them, the sound monitoring module 53 refers to a module that can monitor the sound of the transformer body 1. By monitoring the sound of the transformer body 1, it can be determined whether the transformer is making abnormal noise.

[0153] Based on the above embodiments, the sound monitoring module 53 includes an ultrasonic sensor, and the transformer body 1 also includes a transformer oil tank 16, which includes a low-voltage side oil tank 161 and a high-voltage side oil tank 162. The ultrasonic sensor is disposed on the surface of at least one of the low-voltage side oil tank 161 and the high-voltage side oil tank 162 for monitoring the noise information of the transformer body 1.

[0154] Among them, the ultrasonic sensor is a sensor that converts ultrasonic signals into other energy signals (usually electrical signals). By placing the ultrasonic sensor on the surface of at least one of the low-voltage side tank 161 and the high-voltage side tank 162, it is possible to determine whether the low-voltage side tank 161 and the high-voltage side tank 162 of the transformer body 1 produce abnormal noises, thereby monitoring noise information.

[0155] In optional embodiments of the present invention, such as Figure 15 As shown, the transformer noise analysis and solution system also includes a compensation module 2 and a switching module 3.

[0156] The transformer body 1 includes a low-voltage side 11, which is electrically connected to a grounding wire, and the compensation module 2 is electrically connected to the grounding wire of the low-voltage side 11.

[0157] The switch module 3 is electrically connected to the compensation module 2, and the switch module 3 is used to control the activation and deactivation of the compensation module 2.

[0158] The compensation module 2 is used to connect the low-voltage side 11 and the ground when it is put into operation to reduce the capacitance to ground. The compensation module 2 is used to disconnect the electrical connection with the low-voltage side 11 when it is cut out.

[0159] The low-voltage side 11 grounding wire refers to the wire that electrically connects the low-voltage side 11 to the ground. Switch module 3 refers to the module that controls the connection and disconnection of compensation module 2. Compensation module 2 is a module that reduces the capacitance to ground. When connected, it is electrically connected between the low-voltage side 11 and the ground to reduce the capacitance to ground. When disconnected, it disconnects the electrical connection to the low-voltage side 11, and at this time, it does not reduce the capacitance to ground. Since the transformer only makes abnormal noise when the circuit breaker is open, switch module 3 allows compensation module 2 to reduce the capacitance to ground only when the transformer is open. When the transformer is operating normally without abnormal noise, not reducing the capacitance to ground does not affect the normal operation of the transformer.

[0160] Transformers typically include a high-voltage side. Figure 7 This is a waveform of an ultrasonic signal obtained from monitoring the sound of a transformer using existing technology. Figure 5 The voltage waveform on the high-voltage side of a transformer in existing technology is derived from... Figure 7 It can be seen that the existing transformer exhibited an abnormal surge in signal after tripping, resulting in unusual noises. Simultaneously, as... Figure 5 As shown, the simulated waveform on the high-voltage side of the transformer exhibits a flat-top characteristic, indicating that the 220kV high-voltage cable is relatively long and has a large capacitance to ground, leading to saturation of the transformer and the generation of pulse current. This pulse current causes the transformer core to jerk, resulting in abnormal noise. Figure 10 The ultrasonic signal waveform obtained by monitoring the sound of the transformer in the transformer noise analysis and solution system provided in Embodiment 4 of the present invention is shown below. Figure 8 The voltage waveform on the high-voltage side of the transformer in the transformer noise analysis and resolution system provided in Embodiment 4 of the present invention is obtained from... Figure 8 and Figure 10 It can be seen that the high-voltage side waveform of the transformer provided in this embodiment of the invention has disappeared, and the peak value of the transformer signal provided in this embodiment of the invention has been significantly reduced, and there is no sudden increase. This indicates that by setting the compensation module 2 to reduce the capacitance to ground, the transformer can be prevented from saturating, thereby preventing the generation of pulse current that causes the core of the transformer to jerk and produce abnormal noise. The transformer provided by this invention is not prone to abnormal noise.

[0161] The above solution, by setting up a compensation module 2 and a switch module 3, controls the activation and deactivation of the compensation module 2. When the compensation module 2 is activated, it is electrically connected between the low-voltage side 11 and ground to reduce the capacitance to ground. When the compensation module 2 is deactivated, the electrical connection with the low-voltage side 11 is disconnected. When the capacitance to ground is large, it can cause transformer saturation, resulting in pulse current. This pulse current causes core jerking within the transformer, leading to abnormal noise. By reducing the capacitance to ground when the compensation module 2 is activated, transformer saturation can be prevented, thus preventing the pulse current from causing core jerking and abnormal noise. Therefore, the problem of abnormal noise from the transformer during the tripping process, which seriously affects the stable operation of the transformer, is solved.

[0162] In optional embodiments of the present invention, such as Figure 15 As shown, one end of the switch module 3 is electrically connected to the low-voltage side 11, and the other end of the switch module 3 is electrically connected to the compensation module 2. Thus, when the switch module 3 is turned on, the low-voltage side 11 and the compensation module 2 are electrically connected, enabling the compensation module 2 to be engaged; when the switch module 3 is turned off, the compensation module 2 and the low-voltage side 11 are disconnected, enabling the compensation module 2 to be disengaged. Different states of the switch module 3 allow the compensation module 2 to be engaged and disengaged. Preferably, the switch module 3 includes at least one of a normally open switch and a normally closed switch. When the switch module 3 is a normally open switch, the initial state of the normally open switch is open, at which time the compensation module 2 and the low-voltage side 11 are disconnected. When the normally open switch is closed, the compensation module 2 and the low-voltage side 11 are electrically connected. When the normally closed switch is opened, the compensation module 2 and the low-voltage side 11 are disconnected.

[0163] In an optional embodiment of the present invention, the compensation module 2 includes a reactor 21. The reactor 21, also called an inductor, is widely used in circuits. Due to the effect of electromagnetic induction, it possesses a certain degree of inductance, which helps to prevent changes in current. Since the compensation module 2 is electrically connected between the low-voltage side 11 of the transformer and ground when activated, it achieves parallel connection with the ground capacitance, thereby reducing the overall ground capacitance.

[0164] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0165] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A transformer abnormal sound analysis solution method, characterized by, The method comprises the following steps: establishing a transformer simulation model; determining simulation operation parameters of the transformer based on the transformer simulation model; obtaining actual operation parameters of the transformer; determining an abnormal sound reason based on the actual operation parameters and the simulation operation parameters; determining a preliminary solution based on the abnormal sound reason; verifying whether the preliminary solution is correct through the transformer simulation model; if correct, determining a final rectification scheme based on the preliminary solution; the actual operation parameters comprise a high-voltage side voltage actual measurement waveform, and the simulation operation parameters comprise a high-voltage side voltage simulation waveform; the step of determining the abnormal sound reason based on the actual operation parameters and the simulation operation parameters comprises: determining the abnormal sound reason based on the high-voltage side voltage actual measurement waveform and the high-voltage side voltage simulation waveform; the step of determining the abnormal sound reason based on the high-voltage side voltage actual measurement waveform and the high-voltage side voltage simulation waveform comprises: determining whether the high-voltage side voltage actual measurement waveform and the high-voltage side voltage simulation waveform appear flat-top characteristics; if yes, determining that the abnormal sound reason is that the ground capacitance is too large; the step of determining the preliminary solution based on the abnormal sound reason comprises: when the abnormal sound reason is that the ground capacitance is too large, determining that the preliminary solution is a shunt reactor for reducing the ground capacitance; correspondingly, the step of verifying whether the preliminary solution is correct through the transformer simulation model comprises: connecting the shunt reactor in the transformer simulation model and determining whether the flat-top characteristics of the high-voltage side voltage simulation waveform disappear; if yes, determining that the preliminary solution is correct; if no, determining that the preliminary solution is incorrect; the step of determining the final rectification scheme based on the preliminary solution comprises: obtaining transformer rectification actual measurement data and / or transformer rectification simulation data after the preliminary solution is implemented; determining the final rectification scheme based on the transformer rectification actual measurement data and / or the transformer rectification simulation data.

2. The transformer abnormal sound analysis solution method according to claim 1, characterized in that, the transformer rectification actual measurement data comprise a high-voltage side rectification voltage actual measurement waveform, and the transformer rectification simulation data comprise a high-voltage side rectification voltage simulation waveform; the step of determining the final rectification scheme based on the transformer rectification actual measurement data and / or the transformer rectification simulation data comprises: when the high-voltage side rectification voltage actual measurement waveform and the high-voltage side rectification voltage simulation waveform do not appear flat-top characteristics, determining that the preliminary solution is the final rectification scheme.

3. The transformer abnormal sound analysis solution method according to claim 1, characterized by, the transformer rectification actual measurement data further comprise actual measurement abnormal sound information; the step of determining the final rectification scheme based on the transformer rectification actual measurement data and / or the transformer rectification simulation data comprises: when the actual measurement abnormal sound information does not appear abnormal sound, determining that the preliminary solution is the final rectification scheme.

4. The transformer abnormal sound analysis solution method according to claim 1, characterized by, the step of establishing the transformer simulation model comprises: obtaining transformer model establishment parameters; establishing the transformer simulation model in a PSCAD / EMTDC environment based on the transformer model establishment parameters.

5. A transformer abnormal sound analysis solution system characterized by, the transformer comprises a transformer body, a monitoring device, a fault analysis device and a simulation device; the monitoring device is used for monitoring actual operation parameters of the transformer body; the simulation device is used for establishing a transformer simulation model; The first input end of the fault analysis device is electrically connected with the monitoring device, and the second input end of the fault analysis device is electrically connected with the simulation device, and the fault analysis device is used for executing the transformer abnormal sound analysis solution method in any one of claims 1-4.

6. The transformer abnormal sound analysis solution system according to claim 5, characterized in that, The monitoring device comprises at least one of: a current-voltage monitoring module, configured to monitor at least one of a transformer high-voltage side voltage, a transformer high-voltage side current and a transformer low-voltage side voltage of the transformer body; a partial discharge quantity monitoring module, configured to monitor the partial discharge quantity of the transformer body; a sound monitoring module, configured to monitor the abnormal sound information of the transformer body.

Images