Power transformer closing inrush current monitoring device

Abstract

The utility model relates to a closing inrush current monitoring device for a power transformer, which is connected with a cable of the power transformer and comprises a current transformer and a cable positioned on one side of the power transformer provided with an input switch and connected with the input side of the power transformer. The power supply and signal transmission module is connected with the current transformer; the signal conditioning board is connected with the power supply and signal transmission module; the acquisition module is connected with the signal conditioning board; and the computer is connected with the acquisition module. According to the utility model, the monitoring function is improved, the efficiency of monitoring the current input condition of the transformer can be improved, the instantaneous current condition can be accurately and efficiently captured, the cost is reduced, and the technical problems of complex structure and single measurement function of a measurement device in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to transformer technical field especially relates to a power transformer closing-in inrush current monitoring device. BACKGROUND

[0002] The power transformer is indispensable electrical equipment in the power transmission and distribution system, and its safety is directly related to the stability of the entire power system. Therefore, it is very important to accurately test the closing-in excitation inrush current parameters of the power transformer in the design and production links.

[0003] In the prior art (CN216013476U), a no-load current and no-load voltage measurement system of a transformer is disclosed, which comprises a measurement module, an acquisition module and a processing module. The measurement module comprises a circuit breaker, a bypass switch, a closing resistor, a current transformer and a voltage transformer. When the circuit breaker is operated to close the transformer, the excitation inrush current is rapidly reduced to a stable state by the closing resistor, i.e. the no-load current signal of the measured transformer can be measured by the current transformer and the no-load voltage signal of the measured transformer can be measured by the voltage transformer. The current signal and the voltage signal are acquired by the acquisition module, and the no-load current data and the no-load voltage data of the transformer are obtained by the processing module.

[0004] However, although the related art can measure the no-load current and no-load voltage of the transformer, the structure is complex and the measurement function is single. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies in the related art, the utility model provides a power transformer closing-in inrush current monitoring device to improve the monitoring function, improve the efficiency of monitoring the current input of the transformer, accurately and efficiently capture the instantaneous current condition, and reduce the cost, so as to solve the technical problems of complex structure and single measurement function of the measurement device in the prior art.

[0006] The utility model provides a kind of power transformer closing-in inrush current monitoring device, the cable of device connection power transformer, comprising:

[0007] Current transformer, located at the side of power transformer setting input switch, connect the cable of power transformer input side;

[0008] Power supply and signal transmission module are connected with current transformer;

[0009] Signal conditioning board is connected with power supply and signal transmission module;

[0010] Acquisition module is connected with signal conditioning board;

[0011] Computer is connected with acquisition module.

[0012] The current transformer can effectively induce the inrush current signal at the closing moment of the power transformer, and the signal conditioning board can optimize the signal quality and improve the monitoring accuracy.

[0013] In some embodiments, the current transformer further comprises:

[0014] The fixed clamp comprises a clamp opening through which the cable of the power transformer passes.

[0015] The fixed clamp ensures close contact between the current transformer and the power transformer cable, thereby improving the stability and accuracy of signal acquisition.

[0016] In some embodiments, the signal conditioning board comprises:

[0017] The first input port is connected to the power supply and signal transmission module.

[0018] The first output port is connected to the acquisition module.

[0019] The signal filtering assembly is connected to the first input port at one end and to the first output port at the other end, and has multiple series-connected triodes built-in.

[0020] The signal conditioning board effectively reduces external interference, improves signal quality and stability, and thus improves the overall measurement accuracy of the monitoring device.

[0021] In some embodiments, the signal conditioning board further comprises:

[0022] The first grounding end is connected to the signal filtering assembly at one end and grounded at the other end.

[0023] The signal conditioning board can effectively reduce the interference of ground potential difference on the signal and avoid noise caused by electrical floating.

[0024] In some embodiments, the acquisition module comprises:

[0025] The positive module comprises multiple positive input ports and a positive output port, and the multiple positive input ports are connected to the first output port of the signal conditioning board.

[0026] The negative module comprises multiple negative input ports and a negative output port, and the multiple negative input ports are connected to the first output port of the signal conditioning board.

[0027] The signal amplifier is connected to the positive output port of the positive module and the negative output port of the negative module, respectively.

[0028] The second output port is connected to the signal amplifier and to the computer.

[0029] Through the separate design of the positive and negative electrode modules, the mutual interference of positive and negative signals is effectively avoided, differential amplification of the signals is realized, and the precision and quality of the signals are ensured.

[0030] In some embodiments, the acquisition module further comprises:

[0031] The second grounding end has one end connected to the second output end and the other end grounded.

[0032] The provision of the second grounding end improves the anti-interference capability of the electrical equipment and ensures the stability of the signals during transmission without errors.

[0033] In some embodiments, the computer further comprises:

[0034] The signal receiving module is connected to the acquisition module.

[0035] The data processing module is connected to the signal receiving module.

[0036] The display module is connected to the data processing module.

[0037] The computer integrates multiple functions such as signal reception, data processing, and result display, simplifying the entire monitoring process.

[0038] In some embodiments, the computer further comprises:

[0039] The analog-to-digital conversion module has one end connected to the signal receiving module and the other end connected to the data processing module.

[0040] The analog-to-digital conversion module improves the digital processing capability of the system for analog signals, enabling more accurate acquisition of the inrush signals of the power transformer and providing high-quality digital data for the data processing module.

[0041] In some embodiments, the computer further comprises:

[0042] The digital-to-analog conversion module has one end connected to the data processing module and the other end connected to the display module.

[0043] The digital-to-analog conversion module can convert digital signals into analog signals suitable for display, ensuring the accuracy of data display.

[0044] In some embodiments, the computer further comprises:

[0045] The filter module has one end connected to the digital-to-analog conversion module and the other end connected to the display module.

[0046] The filter module can effectively eliminate high-frequency noise and unnecessary signal fluctuations, making the displayed signals smoother and more stable and improving the accuracy of the monitoring data.

[0047] Based on the above technical scheme, the high-speed current data of the power transformer no-load closing is obtained through the current transformer, and is processed through the signal conditioning board, input into the computer, and forms image information, further improves the current input condition monitoring efficiency of the transformer, and accurately and efficiently captures the instantaneous current condition. BRIEF DESCRIPTION OF DRAWINGS

[0048] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0049] Figure 1 It is a structure schematic view of an embodiment of the power transformer closing inrush current monitoring device of the present application;

[0050] Figure 2 It is a structure schematic view of an embodiment of the power transformer closing inrush current monitoring device of the present application;

[0051] Figure 3 It is a structure schematic view of an embodiment of the power transformer closing inrush current monitoring device of the present application;

[0052] Figure 4 It is a structure schematic view of an embodiment of the power transformer closing inrush current monitoring device of the present application;

[0053] Figure 5 It is a structure schematic view of an embodiment of the power transformer closing inrush current monitoring device of the present application.

[0054] In the drawings:

[0055] 101, current transformer; 102, power supply and signal transmission module; 103, signal conditioning board; 104, acquisition module; 105, computer;

[0056] 201, first input port; 202, first output port; 203, signal filtering assembly; 204, first ground terminal;

[0057] 301, positive module; 302, negative module; 303, signal amplifier; 304, third ground terminal; 305, second output port; 306, second ground terminal;

[0058] 401, signal receiving module; 402, data processing module; 403, display module;

[0059] 501, analog-to-digital conversion module; 502, digital-to-analog conversion module; 503, filtering module. DETAILED DESCRIPTION

[0060] The technical solutions in the embodiments will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0061] In the description of the present application, it should be understood that the terms "center", "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0062] The terms "first", "second", "third" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", "third" can explicitly or implicitly include one or more of the features.

[0063] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0064] As shown in the accompanying Figure 1 In one illustrative embodiment of the power transformer closing inrush current monitoring device of the present application, the power transformer closing inrush current monitoring device is connected to the cable of the power transformer, comprising:

[0065] The current transformer 101 is located on one side of the power transformer provided with an input switch and is connected to the cable of the input side of the power transformer.

[0066] The power supply and signal transmission module 102 is connected with the current transformer 101.

[0067] The signal conditioning board 103 is connected with the power supply and signal transmission module 102.

[0068] The acquisition module 104 is connected with the signal conditioning board 103.

[0069] The computer 105 is connected with the acquisition module 104.

[0070] In the above exemplary embodiment, the current transformer 101 is used to detect the current signal generated at the moment of closing the power transformer, and transmit the current signal to the power supply and signal transmission module 102. The power supply and signal transmission module 102 provides independent power supply for the current transformer 101 to reduce electromagnetic interference. At the same time, the signal of the current transformer 101 is converted into a collectable voltage signal for preliminary transmission. The signal conditioning board 103 isolates the collected signal to reduce other electrical signal interference during the collection process and improve the accuracy of the collected signal. The output port of the signal conditioning board 103 is connected with the acquisition module 104, and the acquisition module 104 collects the conditioned signal. The collected data is transmitted to the computer 105 through the acquisition module 104, and the computer 105 performs further data analysis and display processing, thereby realizing real-time monitoring of the inrush current of the power transformer at the moment of closing.

[0071] The embodiment can effectively detect the inrush current signal at the moment of closing the power transformer, and optimize the signal quality through the signal conditioning board 103 to improve the monitoring accuracy. The whole monitoring device has reasonable structure and clear module division, so that the signal collection, processing and display process are efficient and stable. The computer 105 has strong data processing capability, can analyze and store the monitoring data in real time, and is convenient for subsequent fault diagnosis and power system optimization. In addition, the installation method of the device is simple, can adapt to different models of power transformers, and has good universality.

[0072] In some embodiments, the current transformer 101 further comprises:

[0073] The fixed clamp comprises a clamp opening, and the cable of the power transformer passes through the clamp opening.

[0074] The fixed clamp can ensure the close contact between the current transformer 101 and the power transformer cable, thereby improving the stability and accuracy of signal collection. In order to adapt to power transformer cables of different diameters, the device has better adaptability.

[0075] The fixed clamp is fixedly installed, which is simple to install and can adapt to different models of power transformers, and has good universality. Further enhance the stability of the system, ensure the reliability of long-term monitoring.

[0076] In some embodiments, as shown in Figure 2 The signal conditioning board 103 comprises:

[0077] The first input port 201 is connected with the power supply and signal transmission module 102.

[0078] The first output port 202 is connected with the acquisition module 104.

[0079] The signal filtering assembly 203 is connected to the first input port 201 at one end and to the first output port 202 at the other end, and has multiple series-connected triodes built-in.

[0080] The signal conditioning board 103 conditions the input current signal to ensure signal stability and accuracy. The signal filtering assembly 203 filters and amplifies the signal through the internal series-connected triodes, eliminates high-frequency interference, and makes the signal more stable, so as to facilitate the subsequent data acquisition module 104 to perform accurate data acquisition.

[0081] The signal conditioning board 103 effectively reduces external interference, improves signal quality and stability, and thus improves the overall measurement accuracy of the monitoring device. The series-connected triodes can provide more stable gain adjustment, so that the system can work normally under different working conditions.

[0082] In some embodiments, the signal conditioning board 103 further includes:

[0083] The first grounding end 204 is connected to the signal filtering assembly 203 at one end and grounded at the other end.

[0084] The first grounding end 204 is used to provide a stable electrical ground reference to ensure the safety of the circuit and the accuracy of the signal. The signal conditioning board 103 can effectively reduce the interference of ground potential difference on the signal by connecting the grounding end to the signal filtering assembly 203, and avoid the noise influence caused by electrical floating.

[0085] The setting of the first grounding end 204 ensures the electrical stability of the power transformer closing inrush current monitoring device during operation, improves the reliability of the signal, and avoids equipment failure or measurement error caused by poor grounding, further enhancing the adaptability of the monitoring device in complex electrical environment.

[0086] In some embodiments, as shown in Figure 3 The acquisition module 104 includes:

[0087] The positive electrode module 301 includes a plurality of positive electrode input ports and a positive electrode output port, and the plurality of positive electrode input ports are connected to the first output port 202 of the signal conditioning board 103.

[0088] The negative electrode module 302 includes a plurality of negative electrode input ports and a negative electrode output port, and the plurality of negative electrode input ports are connected to the first output port 202 of the signal conditioning board 103.

[0089] The signal amplifier 303 is connected to the positive electrode output port of the positive electrode module 301 and the negative electrode output port of the negative electrode module 302, respectively.

[0090] The second output port 305 is connected to the signal amplifier 303 and the computer 105.

[0091] The acquisition module 104 is used to collect the signals processed by the signal conditioning board 103 and further amplify and process them. The positive module 301 and the negative module 302 respectively receive signals from the signal conditioning board 103 and output them to the signal amplifier 303 for further gain. The amplified signals are transmitted to the computer 105 for processing and display through the second output port 305.

[0092] By separating the positive and negative modules, the mutual interference of positive and negative signals is effectively avoided, ensuring the accuracy and quality of the signals. The configuration of the signal amplifier 303 effectively enhances the weak current signal, which can accurately reflect the changes of the power transformer closing inrush current. The second output port 305 is directly connected to the computer 105, simplifying the signal transmission path and improving the speed and accuracy of data processing.

[0093] The signal amplifier 303 can use different gain settings of the amplifier module to adapt to different specifications of power transformers. The positive and negative modules can also adjust the number of input ports according to actual needs to optimize the efficiency and reliability of signal input.

[0094] The signal amplifier 303 includes a third ground terminal 304 for reducing interference signals.

[0095] In some embodiments, the acquisition module 104 further includes:

[0096] The second ground terminal 306 has one end connected to the second output end and the other end grounded.

[0097] The second ground terminal 306 is used to provide an electrical ground reference between the signal amplifier 303 and the computer 105, ensuring that the signal will not be disturbed by electrical floating during transmission, thereby avoiding the generation of signal transmission errors. By grounding the second output end, it helps to improve the accuracy and stability of data acquisition.

[0098] The second ground terminal 306 improves the anti-interference ability of electrical equipment, ensuring the stability and accuracy of signals during transmission. Through grounding protection, it avoids electrical fluctuations or noise interference during equipment operation, allowing the acquisition module 104 to output accurate and reliable data.

[0099] In different working environments, the grounding method of the second ground terminal 306 can choose different grounding methods according to different geographical locations, equipment environments or power systems, including multi-point grounding or shielding grounding, to ensure the stability and safety of the equipment.

[0100] In some embodiments, as Figure 4As shown, the computer 105 includes:

[0101] The signal receiving module 401 is connected to the acquisition module 104.

[0102] The data processing module 402 is connected to the signal receiving module 401.

[0103] The display module 403 is connected to the data processing module 402.

[0104] The computer 105 is used to receive the data transmitted by the acquisition module 104, process the data, and display the processing results. The signal receiving module 401 receives the amplified signal from the acquisition module 104 and transmits the signal to the data processing module 402 for processing. The data processing module 402 analyzes, stores, and judges the signal, and then transmits the results to the display module 403. The display module 403 visualizes the analysis results for the staff to make judgments and operations.

[0105] The computer 105 integrates multiple functions such as signal receiving, data processing, and result displaying, simplifying the entire monitoring process. The data processing module 402 can perform in-depth analysis of the signal through algorithms to provide more accurate closing inrush current data. The display module 403 makes the monitoring results intuitive and easy to understand, facilitating real-time monitoring and subsequent decision-making by the staff.

[0106] The computer 105 can use an embedded system to realize remote storage and management of data to adapt to larger-scale monitoring needs. The display module 403 can also be replaced with a higher-resolution touch screen or a remote cloud display interface to improve the convenience of operation.

[0107] As shown in some embodiments, the computer 105 further includes: Figure 5

[0108] The analog-to-digital conversion module 501 is connected to one end of the signal receiving module 401 and the other end of the data processing module 402.

[0109] The analog-to-digital conversion module 501 converts the analog signal received from the signal receiving module 401 into a digital signal for further processing by the data processing module 402. This conversion module can select different resolutions and sampling rates to ensure accurate digitization of the signal and adapt to different frequency monitoring needs.

[0110] The analog-to-digital conversion module 501 improves the system's digital processing capability of analog signals, enabling more accurate acquisition of power transformer inrush signals and providing high-quality digital data for the data processing module 402. Digital signals are easier to store, analyze, and display, improving the performance and flexibility of the overall monitoring device.

[0111] ​In some embodiments, the computer 105 further comprises:

[0112] The digital-to-analog conversion module 502 is connected to the data processing module 402 at one end and to the display module 403 at the other end.

[0113] The digital-to-analog conversion module 502 converts the digital signal output by the data processing module 402 into an analog signal for display by the display module 403. The function of this module is to convert the processed digital data into an analog signal suitable for display, ensuring that the display module 403 can correctly display graphics, data, and alarm information.

[0114] The digital-to-analog conversion module 502 can convert digital signals into analog signals suitable for display, ensuring the accuracy of data display. Through digital-to-analog conversion, the trend of data change can be better presented, providing intuitive monitoring results for staff.

[0115] In some embodiments, the computer 105 further comprises:

[0116] The filter module 503 is connected to the digital-to-analog conversion module 502 at one end and to the display module 403 at the other end.

[0117] The filter module 503 performs filtering processing on the analog signal output by the digital-to-analog conversion module 502 to reduce high-frequency noise and interference signals, improving the stability and accuracy of the signal. After the digital-to-analog conversion module 502 converts the digital signal output by the data processing module 402 into an analog signal, the signal may contain high-frequency noise or pulse interference, which may affect the readability of the data if displayed directly. The filter module 503 uses low-pass filtering or band-pass filtering technology to process the signal, making it smooth, ensuring that the signal presented by the display module 403 is clearer and more accurate.

[0118] The filter module 503 can effectively eliminate high-frequency noise and unnecessary signal fluctuations, making the displayed signal more smooth and stable, improving the accuracy of monitoring data, enhancing system stability, reducing signal jitter, reducing the risk of misjudgment, further improving the reliability of the monitoring system, and reducing the interference of abnormal signals on the monitoring results.

[0119] Through the processing of the filter module 503, the waveform or data presented by the display module 403 is more consistent with the true closing inrush current characteristics, making it easier for monitoring personnel to analyze and judge the operating state of the equipment.

[0120] The signal receiving module 401, the data processing module 402, the analog-to-digital conversion module 501, the digital-to-analog conversion module 502, and the filter module 503 can be set in one or more chips. The display module 403 can be set as a display screen or a display page, facilitating staff to observe the change of current data.

[0121] In practical application, the current transformer 101 is arranged on the input switch side of the power transformer and connected with the cable on the input side of the power transformer. The current transformer 101 is provided with a clamp, and the cable passes through the clamp. The inrush current is formed at the moment of closing of the switch of the power transformer, the large current is converted into small current convenient for collection by the current transformer 101, and then the small current is input into the power supply and signal transmission module 102 to convert the small current into a voltage signal which can be collected.

[0122] The current transformer 101 is communicated with the signal conditioning board 103 through a signal collection line. The voltage signal is input into the signal conditioning board 103 through the signal collection line. In the signal conditioning board 103, the high frequency and electromagnetic interference are removed, and the signal is transmitted between the measured object and the data collection system by using the transformer coupling isolation method in the mode of signal isolation, so that the direct electrical connection between the measured object and the data collection system is avoided.

[0123] The transformer coupling isolation method is used for effective isolation, which can avoid the possibility of damage to the data collection system caused by the mixing of large impact voltage in the measured signal in the transmission process, can avoid the generation of measurement error by isolating the data collected from the data collection device from the ground potential and input mode, and can minimize the test interference by avoiding the mixing of unnecessary DC component in the measured signal.

[0124] The signal is input into the collection module 104, the collection module 104 uses a differential measurement system to collect at high speed, each signal can have a different reference point, and the influence of common-mode noise is effectively eliminated, the sampling precision is higher, and it is more suitable for the transient collection of closing excitation inrush current. The collected data is input into the LABVIEW system of the computer through the Universal Serial Bus 2.0, and the data is uploaded to the computer at high speed.

[0125] It can be seen from the description of the plurality of embodiments of the power transformer closing inrush current monitoring device that the power transformer closing inrush current monitoring device embodiment has at least one or more of the following advantages:

[0126] 1. The high-speed current generated when the power transformer is closed under no load is sensed by the current transformer, and the signal conditioning board is processed and input into the computer to present a current image, so that the monitoring personnel can observe in real time.

[0127] 2. The structure of the monitoring device is optimized, the clamp is used for convenient installation, and a plurality of power transformers can be adapted.

[0128] Finally, it should be explained that: the embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts of each embodiment can be referred to.

[0129] The above examples are only used to illustrate the technical solutions of the present application but not to limit it; although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical solutions of the present application, all of them should be covered in the technical solution range of the present application claimed for protection.

Claims

1. A power transformer inrush current monitoring device, characterized by, The device connects the cable of power transformer, comprising: Current transformer, located on the side of power transformer setting input switch, connecting the cable of power transformer input side; Power supply and signal transmission module, connected with current transformer; Signal conditioning board, connected with power supply and signal transmission module; Acquisition module, connected with signal conditioning board; Computer, connected with acquisition module.

2. The power transformer inrush monitoring device of claim 1, wherein, The current transformer further comprises: Fixed clamp, including clamp opening, the cable of power transformer passes through the clamp opening.

3. The power transformer inrush monitoring device of claim 1, wherein, The signal conditioning board comprises: First input port, connected with power supply and signal transmission module; First output port, connected with acquisition module; Signal filtering assembly, one end communicates with the first input port, the other end communicates with the first output port, and multiple series-connected triodes are built-in.

4. A power transformer inrush monitoring device according to claim 3, characterised in that, The signal conditioning board further comprises: First ground terminal, one end connected with signal filtering assembly, the other end grounded.

5. The power transformer inrush monitoring device of claim 1, wherein, The acquisition module comprises: Positive module, including multiple positive input ports and a positive output port, multiple positive input ports are connected with the first output port of signal conditioning board; Negative module, including multiple negative input ports and a negative output port, multiple negative input ports are connected with the first output port of signal conditioning board; Signal amplifier, connected with the positive output port of positive module and the negative output port of negative module respectively; Second output port, connected with signal amplifier, and connected with computer.

6. A power transformer inrush monitoring device according to claim 5, characterised in that, The acquisition module further comprises: Second ground terminal, one end connected with second output, the other end grounded.

7. The power transformer inrush monitoring device of claim 1, wherein, The computer comprises: Signal receiving module, connected with acquisition module; Data processing module, connected with signal receiving module; Display module, connected with data processing module.

8. A power transformer inrush monitoring device according to claim 7, characterised in that, The computer further comprises: Analog-to-digital conversion module, one end connected with signal receiving module, the other end connected with data processing module.

9. The power transformer inrush monitoring device of claim 7, wherein, The computer further comprises: Digital-to-analog conversion module, one end connected with data processing module, the other end connected with display module.

10. A power transformer inrush monitoring device according to claim 9, characterised in that, The computer further comprises: Filtering module, one end connected with digital-to-analog conversion module, the other end connected with display module.

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