Reverberation time control system for a reverberation chamber

Abstract

The utility model relates to a kind of smelting power supply resonance capacitor adjusting system, adopt in the side of fixed resonance capacitor Parallel Connection several groups of vacuum contactors;Several groups of switchable resonance capacitors are connected in series in the side of vacuum contactor;The one end of the secondary coil of high-frequency transformer is connected by the one end of water-cooled cable smelting coil, the other end of the secondary coil of high-frequency transformer is connected with the one end pin of fixed resonance capacitor, the other end pin of fixed resonance capacitor is connected with the other end of smelting coil by water-cooled cable;Master control system is connected or disconnected several groups of switchable resonance capacitors by controlling vacuum contactor, switchable resonance capacitor and fixed resonance capacitor are parallel or disconnected, the optimal resonance capacitor capacity different from smelting coil is changed by parallel connection.Support vacuum smelting power supply to realize the automatic calculation and quick switching of resonance capacitor capacity after load smelting coil replacement, improve production efficiency, power efficiency and smelting quality.

Description

Technical Field

[0001] The embodiments of this utility model relate to a resonant capacitor adjustment system in the field of vacuum precision casting furnace technology, and particularly to a resonant capacitor adjustment system for a smelting power supply. Background Technology

[0002] A vacuum precision casting furnace is a melting device used to induction heat and remelt pre-alloyed high-temperature master alloy materials in a vacuum environment, and then pour them into a mold to produce the required precision castings. During production, the melting coil needs to be replaced with one of the corresponding specifications depending on the weight of the alloy to be melted. Currently, most vacuum melting power supplies use a fixed resonant capacitor configuration. When the load melting coil is changed to a different specification (e.g., from a 50kg crucible to a 1000kg crucible), the equivalent inductance differs significantly, leading to the following problems: 1) Inefficient manual intervention: Because the resonant capacitor required by the traditional vacuum melting power supply adopts a fixed connection method, the switching of the resonant capacitor capacity depends on manual calculation and manual switching, and the adjustment time is more than 1 hour, resulting in a long melting cycle and low production efficiency.

[0003] 2) Resonant circuit mismatch: Because the resonant capacitor required by the traditional vacuum melting power supply adopts a fixed connection method, the optimal resonant capacitor capacity of the circuit cannot be automatically calculated and replenished according to the working state of the circuit during the melting process, resulting in low power efficiency.

[0004] 3) Parameters cannot be saved: Since the resonant capacitor capacity required by traditional vacuum melting power supply is obtained by manual calculation, there is no electronic storage system to support the saving of the optimal resonant capacitor capacity parameters. When switching the resonant capacitor next time, it is necessary to check the manual history or recalculate, which is time-consuming and inefficient.

[0005] Based on the aforementioned shortcomings, there is a need for a resonant capacitor regulation system for a vacuum melting power supply that supports automatic calculation and rapid switching of the resonant capacitor capacity after the load melting coil is replaced (corresponding to crucibles with capacities of 50kg-1000kg), thereby improving production efficiency, energy efficiency, and melting quality. Utility Model Content

[0006] The purpose of this utility model is to provide a resonant capacitor adjustment system for a smelting power supply that automatically calculates and quickly switches the resonant capacitor capacity after the smelting coil is replaced, thereby improving production efficiency, power efficiency, and smelting quality.

[0007] To achieve the above objectives, the present invention provides a resonant capacitor regulation system for a smelting power supply, comprising: High-frequency transformer; A primary power supply is connected to one side of the high-frequency transformer. A number of fixed resonant capacitors are connected in parallel to one end of the secondary coil of the high-frequency transformer. A vacuum contactor, with several sets of vacuum contactors connected in parallel on one side of the fixed resonant capacitor; A switchable resonant capacitor, wherein several sets of the switchable resonant capacitors are connected in series on one side of the vacuum contactor; The high-frequency transformer has a secondary coil, one end of which is connected to one end of the high-frequency transformer via a water-cooled cable. One end of the secondary coil is connected to one pin of the fixed resonant capacitor, and the other pin of the fixed resonant capacitor is connected to the other end of the high-frequency transformer via the water-cooled cable. The main control system controls the vacuum contactor to connect or disconnect several sets of switchable resonant capacitors, connects or disconnects the switchable resonant capacitors from the fixed resonant capacitors, and changes the different optimal resonant capacitor capacities connected in series with the melting coil.

[0008] Furthermore, in the smelting power supply resonant capacitor adjustment system described in this utility model, the vacuum contactor and the switchable resonant capacitor constitute a switchable resonant capacitor circuit.

[0009] Furthermore, in the smelting power supply resonant capacitor adjustment system of this utility model, the high-frequency transformer, the fixed resonant capacitor, the vacuum contactor, the switchable resonant capacitor, the water-cooled cable, and the smelting coil form an RLC series resonant circuit.

[0010] Furthermore, in the smelting power supply resonant capacitor regulation system described in this utility model, the primary power supply further includes: A rectifier is connected to one side of the three-phase power supply. A filter is connected to one side of the filter on the other side of the rectifier; An inverter is connected to one side of the filter; one end of the other side of the inverter is connected to one end of the primary side of the high-frequency transformer.

[0011] A current transformer, with one end of the current transformer passing through the induction loop on the other side of the inverter; A primary-side capacitor of a high-frequency transformer, one end of which is connected to the other end of the inverter, and the other end of which is connected to the other end of the primary side of the high-frequency transformer. A first voltage sensor, one end of which is connected to one end of the primary side of the high-frequency transformer, and the other end of which is connected to the other end of the primary side of the high-frequency transformer.

[0012] Furthermore, in the smelting power supply resonant capacitor regulation system described in this utility model, the output terminals of the inverter are respectively connected to a bus, and the primary-side capacitor of the high-frequency transformer is connected in series in one of the bus outputs of the inverter; the circuit composed of the rectifier, the filter, the inverter, and the primary-side capacitor of the high-frequency transformer rectifies, filters, and inverts the input three-phase power frequency AC power into single-phase AC power with adjustable frequency and voltage, which is then supplied to the RLC series resonant circuit.

[0013] Furthermore, in the smelting power supply resonant capacitor regulation system described in this utility model, the main control system further includes: Main control board, the main control board is installed in the main control system; A power monitor, which is electrically connected to the main control board; The PLC is electrically connected to the main control board, and the main control board is electrically connected to the inverter. The field control panel is equipped with a power start button and a power stop button; the power start button and the power stop button are electrically connected to the PLC respectively.

[0014] Furthermore, in the smelting power supply resonant capacitor adjustment system of this utility model, the main control board (17) is electrically connected to the signal output terminal of the second voltage sensor (11); the voltage acquisition terminal of the second voltage sensor (11) is connected to the other end of the two water-cooled cables (12) respectively.

[0015] Furthermore, in the smelting power supply resonant capacitor regulation system of this utility model, the voltage acquisition terminal of the first voltage sensor is electrically connected to both ends of the primary coil of the high-frequency transformer, and the signal output terminal of the first voltage sensor is electrically connected to the main control board. The current transformer's sensing loop is mounted on one of the inverter's output busbars, and the current transformer's signal output terminal is electrically connected to the main control board. The main control board is electrically connected to the vacuum contactor.

[0016] Compared with the prior art, the implementation of this utility model involves connecting a primary power supply to one side of a high-frequency transformer; connecting several fixed resonant capacitors in parallel to one end of the secondary coil of the high-frequency transformer; connecting several sets of vacuum contactors in parallel to one side of the fixed resonant capacitors; connecting several sets of switchable resonant capacitors in series to one side of the vacuum contactors; connecting the other end of the secondary coil of the high-frequency transformer to one end of the melting coil via a water-cooled cable; connecting one end of the secondary coil of the high-frequency transformer to one pin of the fixed resonant capacitor; connecting the other pin of the fixed resonant capacitor to the other end of the melting coil via a water-cooled cable; and controlling the vacuum contactors to connect or disconnect several sets of switchable resonant capacitors, thereby changing the optimal resonant capacitor capacity connected in series with the melting coil.

[0017] The resonant capacitor adjustment system for the smelting power supply in this invention supports automatic calculation and rapid switching of the resonant capacitor capacity after the load smelting coil is replaced (corresponding to crucibles with capacities of 50kg-1000kg), thereby improving production efficiency, energy efficiency, and smelting quality. It has the following advantages: The required number of resonant capacitors can be automatically switched and adjusted by controlling the opening and closing of the corresponding vacuum contactor contacts through the electrical system. This avoids the need to manually switch the required resonant capacitors after changing the coil specifications, which consumes a lot of operation time, shortens the melting cycle, and improves production efficiency. The main control board configured in the vacuum melting power supply can automatically detect the power supply operating parameters (including the primary side voltage of the high-frequency transformer, the primary side current of the high-frequency transformer, and the furnace side voltage), and automatically calculate the optimal resonant capacitor capacity of the RLC series resonant circuit based on the self-test parameters, thereby improving the energy efficiency of power consumption. The main control board of the vacuum melting power supply can store the parameters of each melting coil specification separately, which can be directly called when the melting coil is replaced, without the need for manual time-consuming lookup and input of historical parameter information, thus improving work efficiency; Because the resonant capacitor adjustment system can automatically calculate and switch the optimal resonant capacitor capacity, the replaced melting coil can operate under vacuum at the optimal frequency range of the corresponding furnace capacity and close to the maximum allowable voltage of the melting coil, ensuring high-quality products are melted with high energy efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main circuit of the resonant capacitor adjustment system of this utility model; Figure 2 This is a schematic diagram of the control circuit of the resonant capacitor adjustment system of this utility model; Figure 3 This is a flowchart illustrating the operation of the resonant capacitor adjustment system of this utility model.

[0019] In the diagram: 1-Rectifier, 2-Filter, 3-Inverter, 4-Current Transformer, 5-Primary capacitor of high-frequency transformer, 6-First voltage sensor, 7-High-frequency transformer, 8-Fixed resonant capacitor, 9-Vacuum contactor, 10-Switchable resonant capacitor, 11-Second voltage sensor, 12-Water-cooled cable, 13-Smelting coil, 14-Power monitor, 15-Field control panel, 151-Power start button, 152-Power stop button, 16-PLC, 17-Main control board, 20-Primary power supply, 40-Main control system. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0021] The embodiments of this utility model relate to a resonant capacitor adjustment system for a smelting power supply, such as... Figure 1 and Figure 2 As shown, it includes: In this embodiment, a high-frequency transformer 7 is provided in the resonant capacitor regulation system of the smelting power supply; the high-frequency transformer 7 mainly plays the role of voltage transformation between the primary side and the secondary side.

[0022] A primary power supply 20 is connected to one side of the high-frequency transformer 7; the primary power supply 20 mainly provides a stable AC power supply after inversion.

[0023] Several fixed resonant capacitors 8 are connected in parallel to one end of the secondary coil of the high-frequency transformer 7; the high-frequency transformer 7, fixed resonant capacitors 8, vacuum contactor 9, switchable resonant capacitor 10, water-cooled cable 12, and melting coil 13 together form an RLC series resonant circuit.

[0024] Several sets of vacuum contactors 9 are connected in parallel to one side of the fixed resonant capacitor 8; Several sets of switchable resonant capacitors 10 are connected in series on one side of the vacuum contactor 9; the vacuum contactor 9 is used to switch the number of switchable resonant capacitors 10 connected to the circuit. By automatically controlling the opening and closing of the contacts of the vacuum contactor 9, the switchable resonant capacitors 10 can be connected in parallel or disconnected from the fixed resonant capacitor 8, thereby changing the resonant capacitance in the RLC series resonant circuit.

[0025] The other end of the secondary coil of the high-frequency transformer 7 is connected to one end of the melting coil 13 through the water-cooled cable 12. One end of the secondary coil of the high-frequency transformer 7 is connected to one pin of the fixed resonant capacitor 8. The other pin of the fixed resonant capacitor 8 is connected to the other end of the melting coil 13 through the water-cooled cable 12. The melting coil 13 plays the role of high-frequency melting.

[0026] The main control system 40 controls the vacuum contactor 9 to connect or disconnect several sets of switchable resonant capacitors 10, connecting or disconnecting the switchable resonant capacitors 10 from the fixed resonant capacitor 8, thereby changing the different optimal resonant capacitor capacities connected in series with the melting coil 13. The main control system 40 primarily controls the resonant capacitor adjustment system of the melting power supply in this invention.

[0027] The resonant capacitor adjustment system for the melting power supply in this embodiment supports automatic matching calculation and rapid switching of the resonant capacitor capacity after the load melting coil is replaced (corresponding to crucibles with capacities of 50kg-1000kg). Specific technical advantages are as follows: The power supply resonant capacitor adjustment system can automatically switch the required number of switchable resonant capacitors 10 by controlling the opening and closing of the contacts of the corresponding vacuum contactor 9. This avoids the need for manual switching of the required switchable resonant capacitors 10 after changing the specifications of the melting coil 13, which consumes a lot of operation time, shortens the melting cycle, and improves production efficiency.

[0028] The main control board 17 of the power supply resonant capacitor adjustment system is connected to the signal output terminals of the second voltage sensor 11, the current transformer 4, and the first voltage sensor 6 respectively. It can self-test the power supply operating parameters (furnace side voltage, high frequency transformer primary side current, high frequency transformer primary side voltage) and automatically calculate the optimal resonant capacitor capacity of the RLC series resonant circuit based on the parameters.

[0029] The main control board 17 of the power supply resonant capacitor adjustment system can store the parameters corresponding to each specification of melting coil 13 separately, which can be directly called when replacing melting coils without the need for manual time-consuming lookup and input of historical parameter information, thus improving work efficiency.

[0030] The power supply resonant capacitor adjustment system can automatically calculate and switch the optimal resonant capacitor capacity, so that the replaced melting coil 13 can operate under vacuum at the optimal frequency range of the corresponding furnace capacity and close to the maximum allowable voltage of the melting coil 13, ensuring high-quality products are melted with high energy efficiency.

[0031] To achieve the aforementioned technical effects, the smelting power supply resonant capacitor adjustment system in this embodiment, such as... Figure 1 and Figure 2 As shown, the vacuum contactor 9 and the switchable resonant capacitor 10 constitute a switchable resonant capacitor circuit.

[0032] To achieve the aforementioned technical effects, the smelting power supply resonant capacitor adjustment system in this embodiment, such as... Figure 1 and Figure 2 As shown, the high-frequency transformer 7, fixed resonant capacitor 8, vacuum contactor 9, switchable resonant capacitor 10, water-cooled cable 12, and melting coil 13 form an RLC series resonant circuit.

[0033] To achieve the aforementioned technical effects, the smelting power supply resonant capacitor adjustment system in this embodiment, such as... Figure 1 and Figure 2 As shown, the primary power supply 20 also includes: Connect one side of rectifier 1 to the three-phase power supply; rectifier 1 mainly rectifies the three-phase AC power supply into DC power. One side of filter 2 is connected to the other side of rectifier 1; filter 2 mainly serves the function of filtering.

[0034] Connect one side of the inverter 3 to the other side of the filter 2; the inverter 3 mainly functions to convert DC power into AC power.

[0035] One end of the other side of inverter 3 is connected to one end of the primary side of high-frequency transformer 7, and the other end of the other side of inverter 3 is connected to one end of the primary side capacitor 5 of high-frequency transformer; the other end of the primary side capacitor 5 of high-frequency transformer is connected to the other end of the primary side of high-frequency transformer 7.

[0036] The circuit consisting of rectifier 1, filter 2, inverter 3, and high-frequency transformer primary side capacitor 5 rectifies, filters, and inverts the externally input three-phase power frequency AC power into single-phase AC power with adjustable frequency and voltage, which is then used to power the RLC series resonant circuit.

[0037] To achieve the aforementioned technical effects, the smelting power supply resonant capacitor adjustment system in this embodiment, such as... Figure 1 and Figure 2 As shown, the main control system 40 also includes: Main control board 17 is set in main control system 40; control board 17 is electrically connected to vacuum contactor 9. Main control board 17 sends switching signal of switchable resonant capacitor 10 of corresponding channel to vacuum contactor 9, automatically controls vacuum contactor 9 to engage or disengage, thereby switching the corresponding resonant capacitor to RLC series resonant circuit.

[0038] The power monitor 14 is electrically connected to the main control board 17; the power monitor 14 mainly serves to input parameters and display them.

[0039] PLC16 is electrically connected to main control board 17, and main control board 17 is electrically connected to inverter 3; PLC16 plays the role of input and output control.

[0040] The on-site control panel 15 is equipped with a power start button 151 and a power stop button 152; the power start button 151 and the power stop button 152 are electrically connected to the PLC 16 respectively.

[0041] The voltage acquisition terminal of the second voltage sensor 11 is connected to the other end of the two water-cooled cables 12 respectively, and the signal output terminal of the second voltage sensor 11 is electrically connected to the main control board 17.

[0042] The induction ring of the current transformer 4 is mounted on one of the busbars output by the inverter 3; the signal output terminal of the current transformer 4 is connected to the main control board 17, transmitting the primary current acquisition signal of the high-frequency transformer 7 to the main control board 17.

[0043] One end of the first voltage sensor 6 is connected to one end of the primary side of the high-frequency transformer 7, and the other end of the first voltage sensor 6 is connected to the other end of the primary side of the high-frequency transformer 7. The signal output terminal of the first voltage sensor 6 is connected to the main control board 17, and the first voltage sensor 6 transmits the primary side voltage acquisition signal of the high-frequency transformer 7 to the main control board 17.

[0044] The main control board 17 automatically calculates the optimal resonant capacitor capacity of the RLC series resonant circuit based on the detected furnace side voltage acquisition signal, the primary side current acquisition signal of the high-frequency transformer 7, and the primary side voltage acquisition signal of the high-frequency transformer 7.

[0045] The control method of the smelting power supply resonant capacitor regulation system in this utility model, such as Figure 3 As shown, it includes the following steps: Step S1: Connect the melting coil 13 to the output terminal of the melting power supply through the water-cooled cable 12, and add the maximum allowable amount of steel to be melted into the crucible corresponding to the melting coil 13, then proceed to step S2; Step S2: Perform routine checks before power-on. After completion, supply power to the power supply and proceed to step S3. Step S3: Input the current parameters of the melting coil 13 on the screen of the power monitor 14. The power monitor 14 sends the input parameters to the main control board 17 and proceeds to step S4. Proceed to step S4: The main control board 17 performs a self-test on the power supply. After the self-test is normal, the power supply is ready and enters the standby state. Proceed to step S5. Step S5: Press the power start button 151 on the field operation console 15. PLC 16 sends an inverter start signal to the main control board 17 to control the inverter 3 to start working. The power supply runs at a low frequency. Proceed to step S6. Step S6: The main control board 17 calculates the resonant frequency of the RLC series resonant circuit under the state of connecting four sets of fixed resonant capacitors 8 based on the high-frequency transformer primary side voltage detected by the first voltage sensor 6 and the high-frequency transformer primary side current detected by the current transformer 4, and then proceeds to step S7. Step S7: Adjust the power supply to full power operation. The main control board 17 calculates the operating frequency of the RLC series resonant circuit with four fixed resonant capacitors 8 connected based on the furnace side voltage detected by the second voltage sensor 11, and proceeds to step S8. Step S8: The main control board 17 calculates the total inductance of the system based on the resonant frequency, operating frequency, furnace side voltage, and current capacitor capacity of the system series resonant circuit; the main control board 17 reads the stored optimal operating frequency range parameters of the melting coil 13 and sets them as the target value, and then uses the upper limit of the furnace side voltage as a constraint to calculate the optimal capacitor capacity and number of capacitors to be added, and proceeds to step S9. Step S9: Confirm the optimal capacity and quantity of the supplementary capacitors calculated by the system on the screen of the power monitor 14. The main control board 17 saves the parameters to the current specification melting coil parameter table of the system, which will take effect the next time the power is started. Proceed to step S10. Step S10: Press the power stop button 152 on site. PLC 16 sends an inverter stop signal to the main control board 17 to control the inverter 3 to stop working. The power supply stops running and proceeds to step S11. Step S11: Press the reset button on the main control board 17 on site. The main control board 17 resets and performs a self-test on the power system. The main control board 17 sends the corresponding channel closing signal of one or more of the switchable resonant capacitors 10 that need to be added to the vacuum contactor 9 according to the currently set melting coil specifications, and proceeds to step S12. Step S12: One or more of the corresponding vacuum contactors 9 are engaged, and the corresponding number of capacitors are added; the power supply is ready and enters the standby state, proceeding to step S13. Step S13: Press the power start button 151 on the field operation panel 15. PLC 16 sends an inverter start signal to the main control board 17 to control the inverter 3 to start working. The power system operates with optimal parameters, that is, the current melting coil operates under vacuum at the best operating frequency and close to the highest allowable voltage of the induction coil.

[0046] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A resonant capacitor regulation system for a smelting power supply, characterized in that, include: High-frequency transformer (7); A primary power supply (20) is connected to one side of the high-frequency transformer (7). A number of fixed resonant capacitors (8) are connected in parallel to one end of the secondary coil of the high-frequency transformer (7). Vacuum contactors (9) are connected in parallel to one side of the fixed resonant capacitor (8). A switchable resonant capacitor (10) is connected in series on one side of the vacuum contactor (9). The melting coil (13) is connected to one end of the secondary coil of the high-frequency transformer (7) via a water-cooled cable (12). One end of the secondary coil of the high-frequency transformer (7) is connected to one pin of the fixed resonant capacitor (8). The other pin of the fixed resonant capacitor (8) is connected to the other end of the melting coil (13) via the water-cooled cable (12). The main control system (40) controls the vacuum contactor (9) to connect or disconnect several sets of switchable resonant capacitors (10), connects or disconnects the switchable resonant capacitors (10) from the fixed resonant capacitors (8), and changes the different optimal resonant capacitor capacities connected in series with the melting coil (13).

2. The smelting power supply resonant capacitor adjustment system according to claim 1, characterized in that, The vacuum contactor (9) and the switchable resonant capacitor (10) constitute a switchable resonant capacitor circuit.

3. The smelting power supply resonant capacitor adjustment system according to claim 1, characterized in that, The high-frequency transformer (7), the fixed resonant capacitor (8), the vacuum contactor (9), the switchable resonant capacitor (10), the water-cooled cable (12), and the melting coil (13) form an RLC series resonant circuit.

4. The smelting power supply resonant capacitor adjustment system according to claim 1, characterized in that, The primary power supply (20) further includes: A rectifier (1) is connected to one side of a three-phase power supply; A filter (2) is connected to one side of the rectifier (1) on the other side; Inverter (3), one side of the inverter (3) is connected to the other side of the filter (2); one end of the other side of the inverter (3) is connected to one end of the primary side of the high-frequency transformer (7); The current transformer (4) has one end passing through the induction loop of the current transformer (4) on the other side of the inverter (3); The high-frequency transformer primary side capacitor (5) has one end connected to the other end of the inverter (3), and the other end of the high-frequency transformer primary side capacitor (5) is connected to the other end of the high-frequency transformer (7). A first voltage sensor (6) is connected at one end to one end of the primary side of the high-frequency transformer (7), and at the other end to the other end of the primary side of the high-frequency transformer (7).

5. The smelting power supply resonant capacitor adjustment system according to claim 4, characterized in that, The output terminals of the inverter (3) are connected to a bus, and the primary capacitor (5) of the high-frequency transformer is connected in series in one of the bus outputs of the inverter. The circuit composed of the rectifier (1), the filter (2), the inverter (3), and the primary capacitor (5) of the high-frequency transformer rectifies, filters, and inverts the input three-phase power frequency AC power into single-phase AC power with adjustable frequency and voltage, which is then supplied to the RLC series resonant circuit.

6. The smelting power supply resonant capacitor adjustment system according to claim 1, characterized in that, The main control system (40) also includes: Main control board (17), the main control board (17) is installed in the main control system (40); A power monitor (14) is electrically connected to the main control board (17); PLC (16), the PLC (16) is electrically connected to the main control board (17), and the main control board (17) is electrically connected to the inverter (3); The field control panel (15) is equipped with a power start button (151) and a power stop button (152); the power start button (151) and the power stop button (152) are electrically connected to the PLC (16).

7. The smelting power supply resonant capacitor adjustment system according to claim 6, characterized in that, The main control board (17) is electrically connected to the signal output terminal of the second voltage sensor (11); the voltage acquisition terminal of the second voltage sensor (11) is connected to the other end of the two water-cooled cables (12).

8. The smelting power supply resonant capacitor adjustment system according to claim 4, characterized in that, The voltage acquisition terminals of the first voltage sensor (6) are electrically connected to the two ends of the primary coil of the high-frequency transformer (7), and the signal output terminals of the first voltage sensor (6) are electrically connected to the main control board (17). The induction ring of the current transformer (4) is mounted on one of the busbars of the inverter output, and the signal output terminal of the current transformer (4) is electrically connected to the main control board (17). The main control board (17) is electrically connected to the vacuum contactor (9).

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