A fuse detection system and method

Abstract

The application provides a fuse detection system and a detection method, and belongs to the technical field of fuse characteristic detection. A power supply is connected with a voltage regulation module through a switch module, the voltage regulation module is connected with the interface of a measured fuse through a commutation module, the voltage regulation module is connected with a control module through a current collection module, and the control module is connected with the voltage regulation module. The test method is as follows: connecting the measured fuse with the fuse interface in the detection system; selecting a test current according to the fuse specification; pressing the power button to start the power input, and outputting the power supply to the fuse for testing; the PLC controller detects the current output to the fuse in real time through a current transformer; when the current changes, the output voltage of the frequency conversion electronic source and the effective number of turns of the primary winding of the transformer are controlled to adjust the voltage input to the fuse, so that the current input to the fuse is maintained unchanged; and the fuse melting time in the fuse is recorded. The application improves the detection precision of the fuse current time characteristic.

Description

Technical Field

[0001] This invention belongs to the field of fuse characteristic detection technology. Specifically, this invention relates to a fuse detection system and detection method. Background Technology

[0002] As a core overcurrent protection component in circuit systems, fuses are widely used in various fields such as power, electronics, and communications. Their fusing characteristics, such as fusing time and current carrying capacity, directly determine the safety and reliability of the circuit system. Therefore, accurate testing of fuses is crucial during production, factory inspection, and on-site maintenance. Currently, the commonly used fuse testing methods in the industry mainly rely on simple testing circuits or general testing equipment, but these methods have many shortcomings in practical applications and are difficult to meet testing requirements.

[0003] Chinese Patent 204189753U discloses a smart fuse, in which the three-phase lines at the lower end of the fuse are connected. The smart fuse is equipped with a smart control unit, and the three-phase lines at the lower end of the fuse are connected to the smart control unit. The smart control unit includes a fuse status detection unit, a fuse current detection unit for detecting the current in the fuse, and a central control unit. The detection results of the fuse status detection unit and the fuse current detection unit are sent to the central control unit connected to these two units. The central control unit issues instructions based on the detection results.

[0004] Existing technologies mainly rely on simple detection circuits, which suffer from insufficient detection accuracy. Summary of the Invention

[0005] The present invention aims to provide a fuse detection system and detection method to improve the detection accuracy of fuse current time characteristics.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] This invention provides a fuse detection system, including a switching module, a voltage regulation module, a control module, a commutation module, and a current acquisition module. The power supply is connected to the input terminal of the voltage regulation module through the switching module. The output terminal of the voltage regulation module is connected to the interface of the fuse under test through the commutation module. The output terminal of the voltage regulation module is connected to the input terminal of the control module through the current acquisition module. The output terminal of the control module is connected to the input terminal of the voltage regulation module.

[0008] The switching module uses a switch button and a contactor KM1. The power supply is connected to the voltage regulation module through the main contacts of the contactor KM1, and the power supply is connected to the coil of the contactor KM1 through the switch button.

[0009] The voltage regulation module includes a frequency converter, a contactor, and a multi-tap transformer. The frequency converter is connected to the multi-tap transformer via the contactor.

[0010] The frequency conversion electronic source includes frequency conversion electronic source 1 and frequency conversion electronic source 2. The contactors include contactors KM2, KM3, KM4, KM5, KM6, KM12, KM13, and KM14. The transformer includes a large transformer and a small transformer. The positive output terminal of frequency conversion electronic source 1 is connected to taps 1, 2, and 3 on the primary side of the large transformer via contactors KM2, KM3, KM4, and KM5, respectively. The negative output terminal of frequency converter 1 is connected to tap 4 on the primary side of the large transformer via tap 5. The negative output terminal of frequency converter 1 is connected to tap 6 on the primary side of the large transformer via contactor KM5. Taps 4 and 6 are connected via contactor KM6. The positive output terminal of frequency converter 2 is connected to taps 1, 2, and 3 on the primary side of the small transformer via contactors KM12, KM13, and KM14, respectively. The negative output terminal of frequency converter 2 is connected to tap 4 on the primary side of the small transformer.

[0011] The control module uses a PLC controller.

[0012] The commutation module includes a large commutation device and a small commutation device. The large commutation device is connected in parallel with the secondary side of the large transformer, and the small commutation device is connected in parallel with the secondary side of the small transformer.

[0013] The current acquisition module uses a current transformer.

[0014] This invention provides a detection method for a fuse detection system:

[0015] Step 1: Connect the fuse to be tested to the fuse interface in the testing system;

[0016] Step 2: Select the test current according to the fuse specifications;

[0017] Step 3: Press the power button to turn on the power input and output power to the fuse for testing;

[0018] Step 4: The PLC controller detects the current output to the fuse in real time through the current transformer; when the current changes, it controls the output voltage of the frequency converter and the effective number of turns of the primary winding of the transformer to adjust the voltage input to the fuse and maintain the current input to the fuse constant.

[0019] Step 5: Record the fuse blowing time in the fuse box.

[0020] In step two, the test current and test circuit resistance information are input into the PLC controller via computer. The PLC controller calculates the voltage value and switches the voltage level through the commutation module.

[0021] The current transformer detects the current value every 0.5ms and outputs it to the PLC controller.

[0022] The technical effects of this invention are as follows:

[0023] (1) This invention has the advantage of constant and controllable test current. The current acquisition module uses a current transformer, which can proportionally convert the large current output by the transformer into a small current, making it convenient for the PLC controller to detect in real time. During the detection process, as the current carrying time increases, the fuse heats up, causing the resistance to increase, which in turn causes the current to change. At this time, the PLC controller collects the primary current data in real time through the current transformer, responds to the current change in a timely manner, and dynamically adjusts the voltage input to the fuse by adjusting the output voltage of the frequency converter and the effective number of turns of the primary winding of the transformer, thereby maintaining a constant test current. This effectively avoids the influence of current fluctuations on the fuse melting time recording and greatly improves the detection accuracy.

[0024] (2) This invention has the advantage of precise and controllable voltage output. The voltage regulation module uses a variable frequency electronic source and a multi-tap transformer in combination with the precise control of the PLC controller to achieve flexible adjustment and stable output of the test voltage. Among them, the variable frequency electronic source is based on AC-DC-AC conversion and PWM modulation technology, which can convert the input fixed frequency and fixed voltage AC power into a high-quality sine wave with both frequency and voltage that can be precisely adjusted; the multi-tap transformer controls the contactor to open and close through the PLC controller, switching different taps on the primary side to change the effective number of turns, thereby adjusting the output voltage. The two work together to accurately output the required voltage according to the test requirements, providing a stable and accurate power supply foundation for fuse detection, avoiding deviations in test data caused by voltage fluctuations, and ensuring the accuracy and reliability of the test results.

[0025] (3) This invention has the advantages of rich detection ranges and strong compatibility, which can meet the detection needs of fuses of different specifications. At the same time, it is equipped with four fuse interfaces to adapt to various types of fuses under test, without the need for frequent changes of testing fixtures. In addition, the commutation module, through large and small commutation devices and large and small transformers, realizes flexible switching between high voltage and low voltage ranges. The PLC controller can automatically calculate the required test voltage according to the test current and test circuit resistance, and switch the corresponding range, further improving the system's adaptability to fuses of different specifications and expanding the application range of the system.

[0026] (4) The present invention has the advantages of high automation, convenient operation and high detection efficiency. The system adopts a PLC controller as the control core. The test current and test circuit resistance information can be input through the computer. The PLC controller automatically calculates the test voltage, controls the switching of the phase module, and adjusts the voltage and current. No manual intervention is required throughout the process. During the detection process, the PLC controller collects current data in real time, dynamically adjusts parameters, and automatically records the fuse blowing time, which reduces the error of manual operation and saves the time of manual duty and data recording. Attached Figure Description

[0027] This manual includes the following figures, which illustrate the following:

[0028] Figure 1 This is a logical structure block diagram of a fuse detection system and detection method according to the present invention;

[0029] Figure 2 This is a circuit diagram of a fuse detection system and detection method according to the present invention;

[0030] Figure 1 The modules are labeled as follows: 1. Switching module; 2. Voltage regulation module; 3. Control module; 4. Commutation module; 5. Current acquisition module. Detailed Implementation

[0031] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0032] This invention provides a fuse detection system, including a switching module, a voltage regulation module, a control module, a commutation module, and a current acquisition module. The power supply is connected to the input terminal of the voltage regulation module through the switching module. The output terminal of the voltage regulation module is connected to the interface of the fuse under test through the commutation module. The output terminal of the voltage regulation module is connected to the input terminal of the control module through the current acquisition module. The output terminal of the control module is connected to the input terminal of the voltage regulation module.

[0033] The switching module uses a switch button and a contactor KM1. The power supply is connected to the voltage regulation module through the main contacts of the contactor KM1, and the power supply is connected to the coil of the contactor KM1 through the switch button.

[0034] The voltage regulation module includes a frequency converter, a contactor, and a multi-tap transformer. The frequency converter is connected to the multi-tap transformer via the contactor.

[0035] The frequency converter includes frequency converter 1 and frequency converter 2; the contactors include contactors KM2, KM3, KM4, KM5, KM6, KM12, KM13, and KM14; and the transformers include a large transformer and a small transformer. In this embodiment of the invention, the large transformer is specifically model HUB-BYQ120, and the small transformer is specifically model HUB-BYQ015. The positive output terminal of frequency converter 1 is connected to contactors KM2, KM3, KM4, and KM5. Connect taps 1, 2, 3, and 5 to the primary side of the large transformer respectively. Connect the negative output terminal of frequency converter 1 to tap 4 on the primary side of the large transformer. Connect the negative output terminal of frequency converter 1 to tap 6 on the primary side of the large transformer via contactor KM5. Connect taps 4 and 6 via contactor KM6. Connect the positive output terminal of frequency converter 2 to taps 1, 2, and 3 on the primary side of the small transformer via contactors KM12, KM13, and KM14 respectively. Connect the negative output terminal of frequency converter 2 to tap 4 on the primary side of the small transformer.

[0036] The control module uses a PLC controller.

[0037] The commutation module includes a large commutation device and a small commutation device. The large commutation device is connected in parallel with the secondary side of the large transformer, and the small commutation device is connected in parallel with the secondary side of the small transformer.

[0038] The current acquisition module uses a current transformer.

[0039] This invention provides a detection method for a fuse detection system:

[0040] Step 1: Connect the fuse to be tested to the fuse interface in the testing system;

[0041] Step 2: Select the test current according to the fuse specifications;

[0042] Step 3: Press the power button to turn on the power input and output power to the fuse for testing;

[0043] Step 4: The PLC controller detects the current output to the fuse in real time through the current transformer; when the current changes, it controls the output voltage of the frequency converter and the effective number of turns of the primary winding of the transformer to adjust the voltage input to the fuse and maintain the current input to the fuse constant.

[0044] Step 5: Record the fuse blowing time in the fuse box.

[0045] In step two, the test current and test circuit resistance information are input into the PLC controller via computer. The PLC controller calculates the voltage value and switches the voltage level through the commutation module.

[0046] The current transformer detects the current value every 0.5ms and outputs it to the PLC controller. The invention is described in detail below.

[0047] This invention provides a fuse detection system, including a switch module, a voltage regulation module, a control module, a commutation module, and a current acquisition module. The switch module includes a switch button (SA1) and a contactor KM1. When the switch button is pressed, the coil of contactor KM1 is energized, contactor KM1 closes, and power is input. The switch button controls its opening and closing by controlling the energization of the coil of contactor KM1.

[0048] The voltage regulation module includes a frequency converter, a contactor, and a multi-tap transformer. The frequency converter is a device that converts a fixed-frequency, fixed-voltage AC input into a high-quality AC output with precisely adjustable frequency and voltage. Its core technology is AC-DC-AC conversion and PWM modulation, producing a near-ideal sine wave output. In this invention, the frequency converter is used to control the voltage output. The multi-tap transformer refers to a transformer with multiple terminals (tap) on the same winding (primary side in this invention). By switching different taps, the effective number of turns is changed, thereby obtaining various output voltages or adjusting the turns ratio. In this invention, the PLC controller controls the opening and closing of the contactor to switch different taps on the primary side of the transformer to change the effective number of turns. The frequency converter, contactor, and multi-tap transformer work together, controlled by the PLC controller, to accurately output the required voltage.

[0049] The control module uses a PLC controller to control the voltage output of the frequency converter and the contactor on the primary side of the transformer, and to detect the current input of the current transformer.

[0050] The commutation module includes a large commutation device and a small commutation device. In the embodiment of the present invention, the specific model of the large commutation device is HUB-HXQ001, and the specific model of the small commutation device is HUB-HXQ002. They are used to switch voltage inputs. In the embodiment of the present invention, the frequency converter 1 and the large transformer work together to output a large voltage, and the frequency converter 2 and the small transformer work together to output a small voltage. The PLC controller calculates the output of the test voltage based on the test current and the test circuit resistance, and switches the voltage level through the commutation module.

[0051] The current acquisition module uses a current transformer to convert the large current output by the transformer into a smaller current proportionally. The PLC controller controls the test voltage input to the fuse according to the current change to maintain a constant current.

[0052] The connection relationship of a fuse detection system according to the present invention is described in detail below.

[0053] The power supply is connected to frequency converter 1 and frequency converter 2 via contactor KM1. Phase C of the power line is connected to the neutral (N) wire via a switch button and the coil of contactor KM1. The positive output terminal of frequency converter 1 is connected to taps 1, 2, 3, and 5 on the primary side of the large transformer via contactors KM2, KM3, KM4, and KM5, respectively. The negative output terminal of frequency converter 1 is connected to tap 4 on the primary side of the large transformer. The output terminal is connected to tap 6 on the primary side of the large transformer via contactor KM5, and taps 4 and 6 are connected via contactor KM6; the positive output terminal of the frequency converter 2 is connected to taps 1, 2, and 3 on the primary side of the small transformer via contactors KM12, KM13, and KM14 respectively, and the negative output terminal of the frequency converter 2 is connected to tap 4 on the primary side of the small transformer; the large commutation device is connected in parallel with the secondary side of the large transformer, and the small commutation device is connected in parallel with the secondary side of the small transformer. The large transformer is connected in series with contactors KM7, KM8, KM9, KM10, and KM11 via current transformer TA1 to the current detection terminal of the PLC controller. The small transformer is connected in series with contactors KM15 and KM16 via current transformer 2TA1 to the current detection terminal of the PLC controller. The small transformer is connected in series with contactors KM17 and KM18 via current transformer 3TA1 to the current detection terminal of the PLC controller. The secondary sides of the large and small transformers are respectively connected to fuse interfaces. There are four types of fuse interfaces in this invention.

[0054] The following describes in detail the detection method of the fuse detection system of the present invention.

[0055] Connect the fuse under test to the fuse interface in the testing system, select the test current according to the fuse specifications, input the test current and test circuit resistance information into the PLC controller via computer, calculate the test voltage, and control the commutation module to switch the voltage level.

[0056] Press the switch button to turn on the power input. The power is output through the frequency converter and transformer to the fuse for testing. This invention tests the output AC current of the fuse and has multiple selectable ranges, including (0~10)A, (0~50)A, (0~200)A, (0~1000)A, (0~2000)A, (0~5000)A, and (0~8000)A.

[0057] During the test, as the current-carrying time increases, the fuse wire in the fuse heats up, and the fuse resistance increases. The PLC controller monitors the current output to the fuse in real time through a current transformer. When the current changes, it controls the output voltage of the frequency converter and the effective number of turns of the primary winding of the transformer to adjust the voltage input to the fuse, thus maintaining a constant current input to the fuse. The fuse blowing time is recorded.

[0058] In this embodiment of the invention, the current transformer detects the current value every 0.5ms and outputs it to the PLC controller.

[0059] The beneficial effects of the present invention are described in detail below.

[0060] This invention offers the advantage of a constant and controllable test current. The current acquisition module utilizes a current transformer, which proportionally converts the large current output from the transformer into a smaller current, facilitating real-time monitoring by the PLC controller. During the testing process, as the current-carrying time increases, the fuse heats up, leading to increased resistance and subsequent current changes. The PLC controller then acquires the primary current data in real-time through the current transformer, responding promptly to these changes. By adjusting the output voltage of the frequency converter and the effective number of turns in the transformer's primary winding, the voltage input to the fuse is dynamically adjusted, thus maintaining a constant test current. This effectively avoids the impact of current fluctuations on the fuse melting time recording, significantly improving testing accuracy.

[0061] This invention offers the advantage of precise and controllable voltage output. The voltage regulation module employs a variable frequency electronic power source and a multi-tap transformer, combined with precise control from a PLC controller, to achieve flexible adjustment and stable output of the test voltage. The variable frequency electronic power source, based on AC-DC-AC conversion and PWM modulation technology, can convert a fixed-frequency, fixed-voltage AC input into a high-quality sine wave with both frequency and voltage precisely adjustable. The multi-tap transformer, controlled by the PLC controller, switches contactors to change the effective number of turns, thereby adjusting the output voltage. The combined effect of these two components allows for precise output of the required voltage according to testing needs, providing a stable and accurate power supply foundation for fuse testing, avoiding deviations in test data caused by voltage fluctuations, and ensuring the accuracy and reliability of the test results.

[0062] This invention boasts advantages such as a rich variety of testing ranges and strong compatibility, meeting the testing needs of fuses of different specifications. Simultaneously, it features four fuse interfaces, adapting to various types of fuses under test, eliminating the need for frequent changes in testing fixtures. Furthermore, the commutation module, through large and small commutation devices and large and small transformers, enables flexible switching between high and low voltage ranges. The PLC controller can automatically calculate the required test voltage based on the test current and test circuit resistance, and switch the corresponding range accordingly, further enhancing the system's adaptability to different fuse specifications and expanding its application scope.

[0063] This invention has the advantages of high automation, convenient operation, and high testing efficiency. The system uses a PLC controller as the control core. The test current and test circuit resistance information can be input through a computer, and the PLC controller will automatically calculate the test voltage, control the commutation module to switch gears, and adjust the voltage and current. No manual intervention is required throughout the process. During the test, the PLC controller collects current data in real time, dynamically adjusts parameters, and automatically records the fuse blowing time, reducing human operation errors and saving time for manual monitoring and data recording.

[0064] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A fuse detection system, characterized in that: It includes a switching module, a voltage regulation module, a control module, a commutation module, and a current acquisition module. The power supply is connected to the input terminal of the voltage regulation module through the switching module. The output terminal of the voltage regulation module is connected to the interface of the fuse under test through the commutation module. The output terminal of the voltage regulation module is connected to the input terminal of the control module through the current acquisition module. The output terminal of the control module is connected to the input terminal of the voltage regulation module.

2. The fuse detection system as described in claim 1, characterized in that: The switching module uses a switch button and a contactor KM1. The power supply is connected to the voltage regulation module through the main contacts of the contactor KM1, and the power supply is connected to the coil of the contactor KM1 through the switch button.

3. The fuse detection system as described in claim 1, characterized in that: The voltage regulation module includes a frequency converter, a contactor, and a multi-tap transformer. The frequency converter is connected to the multi-tap transformer via the contactor.

4. The fuse detection system as described in claim 3, characterized in that: The frequency conversion electronic source includes frequency conversion electronic source 1 and frequency conversion electronic source 2. The contactors include contactors KM2, KM3, KM4, KM5, KM6, KM12, KM13, and KM14. The transformer includes a large transformer and a small transformer. The positive output terminal of frequency conversion electronic source 1 is connected to taps 1, 2, and 3 on the primary side of the large transformer via contactors KM2, KM3, KM4, and KM5, respectively. The negative output terminal of frequency converter 1 is connected to tap 4 on the primary side of the large transformer via tap 5. The negative output terminal of frequency converter 1 is connected to tap 6 on the primary side of the large transformer via contactor KM5. Taps 4 and 6 are connected via contactor KM6. The positive output terminal of frequency converter 2 is connected to taps 1, 2, and 3 on the primary side of the small transformer via contactors KM12, KM13, and KM14, respectively. The negative output terminal of frequency converter 2 is connected to tap 4 on the primary side of the small transformer.

5. The fuse detection system as described in claim 1, characterized in that: The control module uses a PLC controller.

6. The fuse detection system as described in claim 1, characterized in that: The commutation module includes a large commutation device and a small commutation device. The large commutation device is connected in parallel with the secondary side of the large transformer, and the small commutation device is connected in parallel with the secondary side of the small transformer.

7. The fuse detection system as described in claim 1, characterized in that: The current acquisition module uses a current transformer.

8. A detection method for a fuse detection system as described in any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Connect the fuse to be tested to the fuse interface in the testing system; Step 2: Select the test current according to the fuse specifications; Step 3: Press the power button to turn on the power input and output power to the fuse for testing; Step 4: The PLC controller detects the current output to the fuse in real time through a current transformer; When the current changes, the output voltage of the frequency converter and the effective number of turns of the primary winding of the transformer are controlled to adjust the voltage input to the fuse and maintain the current input to the fuse constant. Step 5: Record the fuse blowing time in the fuse box.

9. The detection method of the fuse detection system as described in claim 8, characterized in that: In step two, the test current and test circuit resistance information are input into the PLC controller via computer. The PLC controller calculates the voltage value and switches the voltage level through the commutation module.

10. The detection method of the fuse detection system as described in claim 8, characterized in that: The current transformer detects the current value every 0.5ms and outputs it to the PLC controller.

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