Novel lightweight automatic adjustment compensation inductance testing device

Abstract

The utility model discloses a novel lightweight automatic adjustment compensation inductance testing device, which relates to the technical field of electrical equipment measurement and comprises a rectification filter unit, a high-frequency conversion unit, an inversion unit, a measurement calculation unit and a DSP (digital signal processor) control unit. The output end of the rectifying and filtering unit is connected with the high-frequency conversion unit, and the output end of the high-frequency conversion unit is connected with the inversion unit; the measurement and calculation unit is used for measuring voltage and output current and sending a measurement result to the DSP control unit, the DSP control unit generates an SPWM signal according to the measurement result and sends the SPWM signal to the inversion unit, and meanwhile, the DSP control unit receives a voltage and current feedback signal of the inversion unit and transmits the feedback signal to the measurement and calculation unit. The inductance value of the compensation inductor needing to be added is calculated according to the actually measured inductance value, the manual calculation time is shortened, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power equipment measurement, in particular to a novel lightweight automatic adjustment compensation inductance testing device. Background Art

[0002] In the power industry, the rapid development of smart grids and new energy technologies is placing higher demands on the performance and testing methods of voltage transformers. Electromagnetic voltage transformers in substations play a vital role in protecting power equipment. They monitor voltage fluctuations in the grid in real time and, if the voltage exceeds a set range, promptly signal the protective device to ensure safe operation of the power equipment. Regulations require that voltage transformers undergo a triple-frequency induction withstand voltage test before a substation is commissioned.

[0003] With the current development of the power grid, GIS substations are expected to increase in number, and inductive withstand voltage tests on GIS electromagnetic voltage transformers will become increasingly frequent. This has led to test sites reaching 20 meters high, up to the fourth or even fifth floor. Without an elevator, carrying instruments weighing approximately 100 kilograms to the test site is inherently difficult. Furthermore, manual adjustment of the compensation inductor for each test is time-consuming. Furthermore, existing instruments capable of performing 220 kV voltage transformer inductive withstand voltage tests utilize a frequency converter combined with an excitation transformer, weighing approximately 50 kilograms and making them difficult to carry. Furthermore, because voltage transformer inductive withstand voltage tests present a capacitive load, compensating inductors are required in the secondary winding to reduce test equipment capacity and avoid frequency-doubling resonance, depending on the voltage level. However, calculating and selecting the compensation inductor is complex, requiring multiple adjustments to each setting, which can take up to four hours and significantly impacts work efficiency.

[0004] Therefore, there is an urgent need for a voltage transformer testing device that can automatically adjust and is lightweight to solve the above-mentioned problems of low efficiency and difficulty in portability of manual adjustment. Utility Model Content

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and to design a novel lightweight automatic adjustment compensation inductance test device. The device is portable and convenient for rapid deployment and operation on site.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] New lightweight automatic adjustment compensation inductance test device, including:

[0008] Rectification and filtering unit, high-frequency conversion unit, inverter unit, measurement and calculation unit and DSP control unit;

[0009] The output end of the rectification and filtering unit is connected to the high-frequency conversion unit, and the output end of the high-frequency conversion unit is connected to the inverter unit;

[0010] The measurement and calculation unit is used to measure the voltage and output current and send the measurement results to the DSP control unit. The DSP control unit generates an SPWM signal to the inverter unit based on the measurement results. At the same time, the DSP control unit receives the voltage and current feedback signals of the inverter unit and transmits the feedback signals to the measurement and calculation unit.

[0011] As a further technical solution of the present invention, the rectification and filtering unit includes a first rectifier bridge, a filter capacitor, and an overvoltage protection circuit composed of a thyristor and a first resistor; the thyristor is connected in parallel with the first resistor and then connected in series to the positive output end of the first rectifier bridge, the positive end of the filter capacitor is connected to the output end of the thyristor, and the negative end of the filter capacitor is connected to the negative output end of the first rectifier bridge.

[0012] As a further technical solution of the present invention, the high-frequency conversion unit includes:

[0013] A high-frequency switching conversion circuit, a high-frequency transformer, and a high-frequency rectification and filtering circuit; the high-frequency switching conversion circuit includes four semiconductor switches, outputs a pulse waveform circuit through the four semiconductor switches, the output end of the pulse waveform circuit is connected to the input end of the high-frequency transformer, the output end of the high-frequency transformer is connected to the high-frequency rectification and filtering circuit, and the high-frequency rectification and filtering circuit includes a second rectifier bridge and a second filter capacitor;

[0014] The inverter unit includes a second high-frequency switching conversion circuit, an output end of the second high-frequency switching conversion circuit is connected in series with a first inductor and a second inductor, and output ends of the first inductor and the second inductor are connected to a third capacitor.

[0015] As a further technical solution of the present invention, the high-frequency transformer is a variable-frequency transformer.

[0016] As a further technical solution of the present invention, the measurement calculation unit includes:

[0017] A voltage transformer, a current transformer, a controller and a first communication module, wherein the voltage transformer and the current transformer are connected to the controller, and the controller is connected to the first communication module.

[0018] As a further technical solution of the present invention, the DSP control unit includes:

[0019] A pulse generator, a voltage and current feedback module, a DSP chip, and a second communication module; the DSP chip is connected to the pulse generator, the output end of the voltage and current feedback module is connected to the DSP chip, and the DSP chip is connected to the second communication module.

[0020] As a further technical solution of the present invention, the first communication module and the second communication module are Bluetooth modules.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. This project uses variable frequency transformer technology to replace traditional power frequency transformer technology, optimizing the power supply structure of the test device. This significantly reduces the weight of the device and greatly improves its current-raising capacity. The use of automated adjustable inductance technology for testing effectively improves work efficiency.

[0023] 2. The automatic adjustable inductor automatically adjusts to the appropriate compensation inductance according to the inductance calculated by the instrument, which has good safety, reliability and practical economic prospects.

[0024] 3. Improve the rising current capacity. The device has a rising current capacity of more than 30A, and the power factor is greatly improved, which greatly shortens the test time, improves the safety of the test work, and reduces the risk of electric shock.

[0025] 4. The utility model calculates the inductance of the compensation inductor that needs to be added based on the actually measured inductance, thereby reducing manual calculation time and compensation inductance adjustment time and improving work efficiency.

[0026] 5. The inductance adjustment is upgraded from the original manual calculation and adjustment to automatic adjustment of the inductance value according to the parameters calculated by the frequency doubling power supply host, shortening the test time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the principle structure diagram of the new lightweight automatic adjustment compensation inductance testing device proposed in this utility model;

[0028] Figure 2 This is the control structure diagram of the new lightweight automatic adjustment compensation inductance test device proposed in this utility model;

[0029] Figure 3 This is the control circuit diagram of the new lightweight automatic adjustment compensation inductance testing device proposed in this utility model. DETAILED DESCRIPTION

[0030] The following describes the specific implementation of the utility model with reference to the accompanying drawings and embodiments:

[0031] It should be noted that the structures, colors, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this utility model without affecting the efficacy and purpose that can be achieved by the present utility model.

[0032] like Figures 1 to 3 As shown, the utility model provides a novel lightweight automatic adjustment compensation inductance testing device, comprising:

[0033] Rectification and filtering unit, high-frequency conversion unit, inverter unit, measurement and calculation unit and DSP control unit;

[0034] The output end of the rectifier and filter unit is connected to the high-frequency conversion unit, and the output end of the high-frequency conversion unit is connected to the inverter unit;

[0035] The measurement and calculation unit is used to measure the voltage and output current and send the measurement results to the DSP control unit. The DSP control unit generates an SPWM signal to the inverter unit based on the measurement results. At the same time, the DSP control unit receives the voltage and current feedback signals of the inverter unit and transmits the feedback signals to the measurement and calculation unit.

[0036] The automatic adjustment compensating inductor test device provided by the utility model is used to automatically adjust the compensating inductor during the inductive withstand voltage test of the substation voltage transformer. The inductance of the compensating inductor that needs to be increased is calculated based on the actually measured inductance, which reduces manual calculation time, improves work efficiency, and greatly improves the current rising capacity. At the same time, the use of automated adjustable inductor technology for testing effectively improves work efficiency.

[0037] In an embodiment of the present invention, the rectifier and filter unit includes a first rectifier bridge, a filter capacitor, and an overvoltage protection circuit consisting of a thyristor and a first resistor. The thyristor and the first resistor are connected in parallel and then in series with the positive output terminal of the first rectifier bridge. The positive terminal of the filter capacitor is connected to the output terminal of the thyristor, and the negative terminal of the filter capacitor is connected to the negative output terminal of the first rectifier bridge. The overvoltage protection circuit consisting of the thyristor and the first resistor can control the voltage waveform across the load, regulate the voltage, and improve power quality.

[0038] In an embodiment of the present utility model, the high-frequency conversion unit includes: a high-frequency switching conversion circuit, a high-frequency transformer, and a high-frequency rectification and filtering circuit; the high-frequency switching conversion circuit includes four semiconductor switches, and a pulse waveform circuit is output through the four semiconductor switches. The output end of the pulse waveform circuit is connected to the input end of the high-frequency transformer, and the output end of the high-frequency transformer is connected to the high-frequency rectification and filtering circuit. The high-frequency rectification and filtering circuit includes a second rectifier bridge and a second filter capacitor;

[0039] The inverter unit includes a second high-frequency switching conversion circuit, an output end of the second high-frequency switching conversion circuit is connected in series with a first inductor and a second inductor, and output ends of the first inductor and the second inductor are connected to a third capacitor.

[0040] The semiconductor switches in the high-frequency switching conversion circuit open and close rapidly at high frequencies, converting the input power into a pulse waveform. The high-frequency pulses are isolated and converted into voltage output through a high-frequency transformer, and then smoothed by a filter circuit to be converted into a stable voltage output. Due to the high frequency, the size of the transformer can be made smaller, making it lighter and more efficient.

[0041] The high-frequency transformer is a variable frequency transformer. Using variable frequency transformer technology to replace traditional industrial frequency transformer technology and optimizing the overall design can make the device weigh only one-fourth of traditional instruments, making it small, light, and easy to carry.

[0042] In an embodiment of the present invention, the measurement and calculation unit includes: a voltage transformer, a current transformer, a controller and a first communication module. The voltage transformer and the current transformer are connected to the controller, and the controller is connected to the first communication module.

[0043] In an embodiment of the utility model, the voltage transformer is used to collect the terminal voltage of the reactor; the current transformer is used to collect the current of the reactor; the control module calculates the inductance of the reactor based on the data collected by the voltage transformer and the current transformer; the first communication module is used to communicate with the DSP control unit, upload the calculated inductance of the reactor to the DSP control unit and receive control instructions from the DSP control unit.

[0044] In one embodiment of the present invention, the DSP control unit includes a pulse generator, a voltage and current feedback module, a DSP chip, and a second communication module. The DSP chip is connected to the pulse generator, the output of the voltage and current feedback module is connected to the DSP chip, and the DSP chip is connected to the second communication module. The DSP chip controls the pulse generator to generate pulse signals to control the inverter unit. The voltage and current values ​​of the inverter unit are collected and fed back to the DSP chip via the voltage and current feedback module. The pulse generator's pulse output is adjusted based on the voltage and current information fed back by the measurement and calculation unit.

[0045] In an embodiment of the present invention, wired communication or wireless communication can be used between the measurement and calculation unit and the DSP control unit. Wired communication includes but is not limited to optical fiber communication, and wireless communication includes Bluetooth communication, WiFi communication, or other wireless communication methods. Preferably, the first communication module and the second communication module are Bluetooth modules.

[0046] This project uses variable frequency transformer technology to replace traditional industrial frequency transformer technology and optimizes the power supply structure of the test device, which greatly reduces the weight of the device and greatly improves the current-raising capacity. At the same time, the use of automated adjustable inductor technology for testing effectively improves work efficiency. Optical fiber is used to transmit signals between the host and the adjustable inductor, enabling the adjustable inductor to adjust at any time according to the inductance value measured by the host.

[0047] This utility model calculates the required compensation inductor based on the actual measured inductance, reducing manual calculation time and compensation inductor adjustment time, thereby improving work efficiency. It also increases current capacity, enabling the device to achieve a current flow of over 30A, significantly improving the power factor and significantly shortening test time. This improves test safety and reduces the risk of electric shock. Inductance adjustment is upgraded from manual calculation and adjustment to automatic adjustment based on parameters measured by the frequency-multiplier power supply, shortening test time.

[0048] Brand-new technology is adopted to design a new lightweight automatic adjustment compensation inductor test device host, which improves the current output capacity of the device and reduces the weight of the host. The automated adjustable compensation inductor is designed to cooperate with the frequency doubling power supply host to achieve the purpose of improving test safety, reducing test complexity and shortening test time.

[0049] This device can be used for induced voltage withstand tests on voltage transformers in newly built substations. If this device is implemented across all newly built substations within the grid, it will reduce the workload of test personnel and shorten the testing time. This will improve tester safety and avoid potential accidents associated with prolonged testing. Comprehensive and accurate test data analysis reports can promptly and accurately identify potential voltage transformer hazards, effectively ensuring the smooth progress of the test and the timely commissioning of the new substation. The automatically adjustable inductor automatically adjusts to the appropriate compensation inductance based on the inductance calculated by the instrument, offering excellent safety, reliability, and practical economic prospects.

[0050] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. New lightweight automatic adjustment compensation inductance test device, characterized by: include: Rectification and filtering unit, high-frequency conversion unit, inverter unit, measurement and calculation unit and DSP control unit; The output end of the rectifier and filter unit is connected to the high-frequency conversion unit, and the output end of the high-frequency conversion unit is connected to the inverter unit; the measurement and calculation unit is used to measure the voltage and output current and send the measurement results to the DSP control unit, and the DSP control unit generates an SPWM signal to the inverter unit according to the measurement results. At the same time, the DSP control unit receives the voltage and current feedback signals of the inverter unit and transmits the feedback signals to the measurement and calculation unit.

2. The novel lightweight automatic adjustment and compensation inductance testing device according to claim 1 is characterized in that: The rectification and filtering unit includes a first rectifier bridge, a filter capacitor, and an overvoltage protection circuit consisting of a thyristor and a first resistor; the thyristor is connected in parallel with the first resistor and then connected in series to the positive output end of the first rectifier bridge, the positive end of the filter capacitor is connected to the output end of the thyristor, and the negative end of the filter capacitor is connected to the negative output end of the first rectifier bridge.

3. The novel lightweight automatic adjustment and compensation inductance testing device according to claim 1 is characterized in that: The high frequency conversion unit includes: A high-frequency switching conversion circuit, a high-frequency transformer, and a high-frequency rectification and filtering circuit; the high-frequency switching conversion circuit includes four semiconductor switches, outputs a pulse waveform circuit through the four semiconductor switches, the output end of the pulse waveform circuit is connected to the input end of the high-frequency transformer, the output end of the high-frequency transformer is connected to the high-frequency rectification and filtering circuit, and the high-frequency rectification and filtering circuit includes a second rectifier bridge and a second filter capacitor; The inverter unit includes a second high-frequency switching conversion circuit, an output end of the second high-frequency switching conversion circuit is connected in series with a first inductor and a second inductor, and output ends of the first inductor and the second inductor are connected to a third capacitor.

4. The novel lightweight automatic adjustment and compensation inductance testing device according to claim 3 is characterized in that: The high frequency transformer is a variable frequency transformer.

5. The novel lightweight automatic adjustment and compensation inductance testing device according to claim 1 is characterized in that: The measurement calculation unit includes: A voltage transformer, a current transformer, a controller and a first communication module, wherein the voltage transformer and the current transformer are connected to the controller, and the controller is connected to the first communication module.

6. The novel lightweight automatic adjustment and compensation inductance testing device according to claim 1 is characterized in that: The DSP control unit includes: Pulse generator, voltage and current feedback module, DSP chip, second communication module; The DSP chip is connected to the pulse generator, the output end of the voltage and current feedback module is connected to the DSP chip, and the DSP chip is connected to the second communication module.

7. The novel lightweight automatic adjustment and compensation inductance testing device according to claim 5 is characterized in that: The first communication module and the second communication module are Bluetooth modules.

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