Transformer dc blocking device with capacitor self-checking function

Abstract

The application relates to the field of transformer direct-current isolation devices, and particularly discloses a transformer direct-current isolation device with a capacitor self-checking function, which comprises a machine body, a capacitor group, a zinc oxide group and a bypass switch are arranged in the machine body, the capacitor group is electrically connected with a capacitor self-checking module, the capacitor group comprises a plurality of capacitors, the transformer is connected in series with the capacitor group through wires, the capacitor group and the zinc oxide group are connected in parallel through wires, and the zinc oxide group and the bypass switch are connected in parallel through wires; the capacitor self-checking module comprises an acquisition unit, a verification unit, a signal processing unit and a pre-warning unit. When the application is used, the voltage between the two ends of the capacitor can be monitored in real time, and the pre-warning level of the monitoring result can be displayed externally, so that people can intuitively observe the voltage between the two ends of the capacitor.

Description

Technical Field

[0001] This invention relates to the field of transformer DC blocking equipment technology, and in particular to a transformer DC blocking device with capacitor self-testing function. Background Technology

[0002] A transformer is a device that uses the principle of electromagnetic induction to change alternating current voltage. Its main components are the primary coil, the secondary coil, and the iron core (magnetic core). The main functions of a transformer include voltage transformation, current transformation, impedance transformation, isolation, and voltage stabilization (magnetic saturation transformer). According to its use, it can be divided into power transformers and special transformers.

[0003] When a single-phase grounding or asymmetrical short-circuit fault occurs during the use of a DC blocking device, the inrush current of the capacitor flows through the capacitors inside the device. This causes the voltage across the capacitor bank to rise rapidly. Typically, zinc oxide components are needed to limit the voltage across the capacitor bank. However, when the connection between the zinc oxide components and the capacitor bank is unstable or loose, or when the capacitors themselves are damaged or otherwise malfunctioning, external personnel cannot promptly assess the capacitors' condition. Furthermore, the capacitor bank itself cannot perform autonomous monitoring during use, resulting in inadequate protection and timely maintenance of the capacitors during DC blocking device operation. Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides a transformer DC blocking device with capacitor self-test function.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A transformer DC blocking device with capacitor self-test function includes a body, inside which a capacitor bank, a zinc oxide bank, and a bypass switch are installed. The capacitor bank is electrically connected to a capacitor self-test module, and the capacitor bank includes several capacitors. The transformer is connected in series with the capacitor bank via a wire. The capacitor bank and the zinc oxide bank are connected in parallel via a wire. The zinc oxide bank and the bypass switch are connected in parallel via a wire.

[0007] The capacitor self-test module includes a data acquisition unit, a verification unit, a signal processing unit, and an early warning unit;

[0008] The acquisition unit is used to acquire the real-time voltage across the capacitor bank and send the acquired real-time voltage to the verification unit.

[0009] The verification unit is used to verify the accuracy of the received real-time voltage and send the verification result to the signal processing unit.

[0010] The signal processing unit is configured to receive the verification result, compare the verification result with a preset warning voltage value to determine the warning level, and send the warning level to the warning unit;

[0011] The warning unit includes a warning light and a plurality of warning lamps. The warning unit determines the number of warning lamps to be activated according to the received warning level. When all the warning lamps are turned on, the warning light is automatically turned on.

[0012] Optionally, the process by which the verification unit performs accuracy verification on the received real-time voltage includes:

[0013] Calculating a standard voltage value using a preset voltage operation rule,

[0014] The preset voltage operation rule includes: U 准 = E * U 实 ;

[0015] U 准 is the standard voltage value after verification of the voltage across the capacitor bank, that is, the verification result, U 实 is the actually measured voltage value across the capacitor bank, and E is a preset balance coefficient;

[0016] When there is poor contact in the capacitor bank, both the measured U 准 and U 实 are zero.

[0017] Optionally, the process of determining the warning level according to the verification result includes:

[0018] Comparing the verification result with a preset warning voltage value, where the warning voltage value includes U1, U2, U3, U4......Un;

[0019] When 0 < U 准 < U1, it is a safe voltage level, U 准 ≥ U1 is a dangerous voltage level, and there is one warning level between adjacent warning voltage values, and each warning level includes the minimum endpoint of the interval, U 准 = 0 is the warning level.

[0020] Preferably, a mounting plate is installed on the inner wall of the body. A plurality of capacitors are installed on the top of the mounting plate. Connecting rods are installed at both ends of the top of the capacitor. Limiting holes are formed through the outer wall of the connecting rod. A protective shell is installed above the capacitor, and the top end of the capacitor is located inside the protective shell. A plurality of connecting mechanisms are installed on the top of the capacitor. Mounting holes are formed at both ends of the top of the body. Guide cylinders are installed at both ends of the top of the protective shell. The top end of the guide cylinder passes through the mounting hole and is installed with a concave fixing plate, and the fixing plate is communicated with the inside of the guide cylinder.

[0021] Preferably, the connecting mechanism includes a fixing plate, with placement grooves at both ends of the inner wall of the fixing plate. The fixing plate is installed on the top of two adjacent capacitors, and the connecting rods of the top of the two adjacent capacitors near the fixing plate are located at the inner ends of the fixing plate. A first screw is installed at both inner ends of the fixing plate, with one end of the first screw passing through a limiting hole and being installed on the fixing plate by threads.

[0022] Preferably, a second screw is installed in the limiting hole on each of the two connecting rods near the inner wall of the machine body. The end of the second screw near the inner wall of the machine body has a connecting hole. An insulating pad is installed on both the first screw and the second screw, and one side of the insulating pad abuts against the outer wall of the connecting rod.

[0023] Preferably, a rotating plate is rotatably mounted on one side of the protective shell, and a limiting plate is installed on the side of the rotating plate near the capacitor. The limiting plate has a plurality of limiting grooves equidistantly opened on the side near the capacitor, and the inner wall of the limiting groove abuts against the outer wall of the capacitor.

[0024] Preferably, conductive plates are installed at both ends of the inner top of the protective shell, and the bottom of the two conductive plates abuts against the top of the two connecting rods near the inner walls of the two sides of the body. A warning light is installed on the top of the body, and a siren is installed inside the warning light. Several warning lights are installed on the outer wall of the warning light. Several springs are installed between the top of the protective shell and the inner top of the body.

[0025] Preferably, the bottom of both sides of the guide cylinder is provided with through holes, the bottom of the fixed plate is provided with air vents at both ends, a bracket is installed on the inner wall of the fixed plate, a fan blade is installed on the top of the bracket, a protective net is installed on the top of the inner wall of the fixed plate, and the fan blade is located below the protective net.

[0026] Preferably, a placement plate is installed on the inner wall of the machine body, and a partition is installed at the end of the placement plate away from the inner wall of the machine body. The two ends of the partition are respectively installed on the inner bottom of the machine body and the opposite side of the installation plate. Several zinc oxide valve plate assemblies are installed on the top of the placement plate and the inner bottom of the machine body. A bypass switch box is installed on the inner bottom of the machine body. The bypass switch box and the zinc oxide valve plate assemblies are respectively located on both sides of the partition.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. In this invention, several warning lights can illuminate according to the voltage across the capacitor bank, and the number of warning lights illuminated can be adjusted according to the warning level of the voltage across the capacitor bank. When the voltage across the capacitor bank is too high, causing all the warning lights to illuminate, the warning light will illuminate, and at the same time, the siren inside the warning light will sound to alert people in the surrounding area. The warning lights can display the warning level of the voltage across the capacitor bank in real time to the outside world through the number of warning lights illuminated. When there is a poor connection in the capacitor bank, the warning light will flash continuously, and the staff can observe the voltage across the capacitor bank at any time through the warning lights. During use, there is no need for personnel to manually check the voltage across the capacitor bank, making it more convenient to use and enabling self-testing of the capacitor bank.

[0029] 2. During use, several capacitors can be connected in series through the fixing plate, which can support and fix the position of several capacitors. The connection effect of several capacitors is better and the connection is more stable. When it is not necessary to monitor the voltage at both ends of the capacitor bank, the operator can rotate the fixing plate when connecting the capacitors in series, so that the top of the fixing plate supports the protective shell. The conductive plate on the top of the protective shell cannot be connected to the connecting rod. The operator can adjust the installation method of the fixing plate according to the usage requirements.

[0030] 3. When handling and storing capacitors, the fixing plate can be inserted into the top of the capacitor. The two placement slots at the top of the fixing plate can protect the two connecting rods on the top of the capacitor, preventing the connecting rods from being bumped by the staff during handling and storage, which could cause deformation of the capacitor connecting rods and unstable current transmission during use. When installing and using the capacitor, the staff can simply remove the fixing plate, making the installation and disassembly of the capacitor more convenient. Attached Figure Description

[0031] Figure 1 This is a circuit diagram of a transformer DC blocking device with capacitor self-test function proposed in this invention;

[0032] Figure 2 This is a schematic diagram of a transformer DC blocking device with capacitor self-test function proposed in this invention;

[0033] Figure 3 This is a perspective view of a transformer DC blocking device with capacitor self-testing function proposed in this invention;

[0034] Figure 4 This is a schematic diagram of the protective shell installation structure of a transformer DC blocking device with capacitor self-test function proposed in this invention.

[0035] Figure 5This is a schematic diagram of the installation structure of the limiting plate of a transformer DC blocking device with capacitor self-test function proposed in this invention;

[0036] Figure 6 This is a schematic diagram of the protective shell structure of a transformer DC blocking device with capacitor self-test function proposed in this invention;

[0037] Figure 7 This is a schematic diagram of a capacitor bank structure for a transformer DC blocking device with capacitor self-testing function proposed in this invention.

[0038] Figure 8 This is a cross-sectional view of the guide cylinder of a transformer DC blocking device with capacitor self-testing function proposed in this invention;

[0039] Figure 9 This is a schematic diagram of the fixing plate structure of a transformer DC blocking device with capacitor self-testing function proposed in this invention;

[0040] Figure 10 This is a schematic diagram of a warning light structure for a transformer DC blocking device with capacitor self-testing function proposed in this invention.

[0041] In the diagram: 1. Body; 2. Mounting plate; 3. Capacitor; 4. Protective shell; 5. Mounting hole; 6. Guide cylinder; 7. Fixing plate; 8. Warning light; 9. Rotating plate; 10. Spring; 11. Through hole; 12. Connecting rod; 13. Conductive sheet; 14. Limiting plate; 15. Limiting groove; 16. Fixing plate; 17. Placement groove; 18. First screw; 19. Insulating pad; 20. Zinc oxide valve plate assembly; 21. Warning light; 22. Second screw; 23. Connecting hole; 24. Vent; 25. Bracket; 26. Protective net; 27. Fan blade; 28. Bypass switch box; 29. ​​Partition plate; 30. Placement plate; D: AC transformer; C: Capacitor bank; FR: Zinc oxide bank; K: Bypass switch. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0043] Reference Figure 1-10 A transformer DC blocking device with capacitor self-test function includes a body 1. The body 1 is equipped with a capacitor bank, a zinc oxide bank and a bypass switch. The capacitor bank is electrically connected to a capacitor self-test module. The capacitor bank includes several capacitors 3. The transformer is connected in series with the capacitor bank through a wire. The capacitor bank and the zinc oxide bank are connected in parallel through a wire. The zinc oxide bank and the bypass switch are connected in parallel through a wire.

[0044] The capacitor self-checking module includes an acquisition unit, a verification unit, a signal processing unit, and an early warning unit;

[0045] The acquisition unit is used to acquire the real-time voltage at both ends of the capacitor bank and send the acquired real-time voltage to the verification unit;

[0046] The verification unit is used to perform accuracy verification on the received real-time voltage and send the verification result to the signal processing unit;

[0047] The signal processing unit is used to receive the verification result, compare the verification result with a preset early warning voltage value to determine the early warning level, and send the early warning level to the early warning unit;

[0048] The early warning unit includes a warning lamp 8 and several early warning lamps 21. The early warning unit determines the number of activated early warning lamps 21 according to the received early warning level. When all the early warning lamps 21 are turned on, the warning lamp 8 is automatically turned on.

[0049] As a technical optimization scheme of the present invention, the process of the verification unit performing accuracy verification on the received real-time voltage includes:

[0050] Calculating the standard voltage value using a preset voltage operation rule,

[0051] The preset voltage operation rule includes: U 准 = E * U 实 ;

[0052] U 准 is the standard voltage value after voltage verification at both ends of the capacitor bank, that is, the verification result, U 实 is the actually measured voltage value at both ends of the capacitor bank, and E is a preset balance coefficient;

[0053] When there is poor contact in the capacitor bank, both the measured U 准 and U 实 are zero.

[0054] As a technical optimization scheme of the present invention, the process of determining the early warning level according to the verification result includes:

[0055] Comparing the verification result with a preset early warning voltage value. The early warning voltage value includes U1, U2, U3, U4......Un; the values of U1, U2, U3, U4......Un increase in sequence.

[0056] When 0 < U 准 < U1 is the safe voltage level, U 准≥U1 represents a dangerous voltage level. A warning level is defined as the interval between two adjacent warning voltage values, and each warning level includes the minimum endpoint of the interval. 准 =0 represents the warning level. When the voltage level is safe, warning light 21 will not be activated. Each warning level corresponds to a set of warning lights 21 that are activated. The higher the warning level, the more warning lights 21 are activated. After all warning lights 21 are activated, warning light 8 will turn on, allowing staff to promptly check the capacitor bank's operating status using warning light 8. If U 准 If U ≥ Un, then all warning lights 21 will turn on, and warning light 8 will turn on accordingly. During operation, poor contact at the capacitor bank terminals will cause U to... 准 When the alert level is 0, all warning lights 21 will flash to alert external personnel, allowing them to promptly detect the issue and perform timely maintenance on the DC isolation equipment. External personnel can monitor the voltage on the capacitor bank in real time by observing the number of illuminated warning lights 21. The control of the number of illuminated warning lights 21 utilizes existing technology and will not be elaborated upon here.

[0057] As a technical optimization of the present invention, an mounting plate 2 is installed on the inner wall of the body 1. Several capacitors 3 are mounted on the top of the mounting plate 2. Connecting rods 12 are installed at both ends of the top of each capacitor 3. Limiting holes are formed through the outer walls of the connecting rods 12. A protective shell 4 is installed above the capacitors 3, with the top of the capacitors 3 located inside the protective shell 4. Several connecting mechanisms are installed on the top of the capacitors 3. Mounting holes 5 are formed at both ends of the top of the body 1. Guide cylinders 6 are installed at both ends of the top of the protective shell 4. The top of the guide cylinder 6 passes through the mounting holes 5 and is fitted with a concave fixing plate 7, which communicates with the interior of the guide cylinder 6. During use, the protective shell 4 protects and shields the capacitors 3, while simultaneously monitoring the voltage across the capacitors 3 in real time, allowing staff to quickly understand the usage status of the capacitors 3.

[0058] As a technical optimization of the present invention, the connecting mechanism includes a fixing plate 16. Placement slots 17 are provided at both ends of the inner wall of the fixing plate 16. The fixing plate 16 is installed on the top of two adjacent capacitors 3, and the connecting rods 12 of the top of the two adjacent capacitors 3 are located at the inner ends of the fixing plate 16. First screws 18 are installed at both inner ends of the fixing plate 16. One end of the first screw 18 passes through a limiting hole and is threaded onto the fixing plate 16. The first screws 18 can connect the two adjacent capacitors 3 in series and effectively fix the position of the capacitors 3. When the capacitors 3 are placed outside, the fixing plate 16 can be flipped and placed on top of the capacitors 3, so that the top ends of the two connecting rods 12 on the top of the capacitors 3 are located inside the placement slots 17. The fixing plate 16 provides good protection for the connecting rods 12, and makes it easier for workers to remove and use the fixing plate 16 when installing the capacitors 3.

[0059] As a technical optimization of the present invention, a second screw 22 is installed in the limiting hole of the two connecting rods 12 near the inner wall of the two sides of the body 1. The end of the second screw 22 near the inner wall of the body 1 has a connecting hole 23. An insulating pad 19 is installed on the first screw 18 and the second screw 22, and one side of the insulating pad 19 abuts against the outer wall of the connecting rod 12. The second screw 22 can be connected to the bypass switch box 28 and the zinc oxide valve plate group 20 through the connecting wire. When connecting, one end of the connecting wire is inserted into the connecting hole 23 on the second screw 22, which is more convenient to use.

[0060] As a technical optimization of the present invention, a rotating plate 9 is rotatably installed on one side of the protective shell 4. A limiting plate 14 is installed on the side of the rotating plate 9 near the capacitor 3. A plurality of limiting grooves 15 are equidistantly opened on the side of the limiting plate 14 near the capacitor 3, and the inner wall of the limiting grooves 15 abuts against the outer wall of the capacitor 3. When in use, the limiting plate 14 can clamp and fix the position of a plurality of capacitors 3, making the capacitors 3 more stable when in use.

[0061] As a technical optimization of the present invention, conductive plates 13 are installed at both ends of the inner top of the protective shell 4, and the bottom of the two conductive plates 13 respectively abuts against the top of the two connecting rods 12 near the inner walls of the two sides of the body 1. A warning light 8 is installed on the top of the body 1, and a siren is installed inside the warning light 8. Several warning lights 21 are installed on the outer wall of the warning light 8. Several springs 10 are installed between the top of the protective shell 4 and the inner top of the body 1. When in use, the springs 10 can push the protective shell 4 to descend, so that the conductive plates 13 can better connect with the connecting rods 12 at the top of the capacitor 3. At the same time, the protective shell 4 and the mounting plate 2 can clamp the upper and lower ends of several capacitors 3.

[0062] As a technical optimization of the present invention, through holes 11 are provided on both sides of the bottom of the guide cylinder 6, and air outlets 24 are provided through both ends of the inner bottom of the fixed plate 7. A bracket 25 is installed on the inner wall of the fixed plate 7, and a fan blade 27 is installed on the top of the bracket 25. A protective net 26 is installed on the top of the inner wall of the fixed plate 7, and the fan blade 27 is located below the protective net 26. When the protective shell 4 is lowered, the fixed plate 7 can limit the movement distance of the guide cylinder 6 and the protective shell 4. At this time, the fan blade 27 drives the air inside the machine body 1 to circulate. When the protective shell 4 is raised, the fan blade 27 can blow the top of the machine body 1 through the air outlet 24, and clean the dust on the top of the machine body 1 and the surface of the warning light 8, so that the staff can check the number of lights lit by the warning light 21. When in use, the staff can turn the fan blade 27 off and on according to the usage situation. When other ventilation devices are installed inside the machine body 1, the fixed plate 7 and the fan blade 27 only serve the functions of limiting and cleaning the warning light 21.

[0063] As a technical optimization of the present invention, a placement plate 30 is installed on the inner wall of the body 1. A partition plate 29 is installed at the end of the placement plate 30 away from the inner wall of the body 1. The two ends of the partition plate 29 are respectively installed on the inner bottom of the body 1 and the opposite side of the mounting plate 2. A plurality of zinc oxide valve plate groups 20 are installed on the top of the placement plate 30 and the inner bottom of the body 1. A bypass switch box 28 is installed on the inner bottom of the body 1. The bypass switch box 28 and the zinc oxide valve plate groups 20 are respectively located on both sides of the partition plate 29. In use, the zinc oxide valve plate groups 20 and the bypass switch box 28 are connected by a connecting wire to protect the capacitor bank during use.

[0064] In use, transformer D is connected in series with capacitor bank C via a conductor, while capacitor bank C and zinc oxide bank FR are connected in parallel via a conductor. Zinc oxide bank FR and bypass switch K are also connected in parallel via a conductor. During use, the end of capacitor bank furthest from transformer D is connected to the grounding wire. When the voltage across capacitor bank C is too high, the current transmitted through transformer D flows through zinc oxide bank FR. When bypass switch K is closed, the current transmitted through transformer D flows from bypass switch K to the grounding wire.

[0065] During overall installation, the operator rotates the rotating plate 9 and pushes the protective shell 4 upwards, allowing several capacitors 3 to be placed side-by-side on top of the mounting plate 2. These capacitors 3 are connected in series via the fixing plate 16. During installation, the fixing plate 16 is placed on top of two adjacent capacitors 3, with one of the connecting rods 12 on top of each capacitor 3 located at opposite ends inside the fixing plate 16. The operator inserts the first screw 18 into the limiting hole within the connecting rod 12, with one end of the first screw 18 threaded onto the fixing plate 16. The other end of the first screw 18 is separated from the connecting rod 12 by an insulating pad 19. As the first screw 18 rotates and moves towards the connecting rod 12, the connecting rod 12 compresses the insulating pad 19, preventing friction damage to the surface of the connecting rod 12 during installation. This provides better protection for the connecting rod 12 during use. Simultaneously, the fixing plate 16 is more stable during installation and use, preventing loosening. The fixing plate 16 allows several capacitors 3 to be connected in series.

[0066] The operator connects the capacitor 3, zinc oxide valve plate assembly 20, and bypass switch box 28 to each other using connecting wires. During connection, one end of the connecting wire can be directly inserted into the connecting hole 23 on the second screw 22, making installation easier. The operator releases the protective shell 4, and the spring 10 pushes the protective shell 4 downwards. Simultaneously, the conductive plates 13 at both ends of the top of the protective shell 4 also descend with it, abutting against the connecting rods 12 at the top of the two capacitors 3 near the inner wall of the body 1. The limiting plate 14 on the side of the rotating plate 9 also rotates towards the capacitors 3, causing the inner wall of the limiting groove 15 to abut against the outer wall of the capacitors 3. During use, the limiting groove 15 effectively limits the position of the capacitors 3, preventing them from wobbling. Furthermore, the protective shell 4, through the push of the spring 10 and the cooperation of the mounting plate 2, clamps and limits the upper and lower ends of several capacitors 3.

[0067] During use, the two conductive plates 13 are connected to a preset voltage detection device to monitor the voltage across the capacitor bank. Several warning lights 21 illuminate based on the monitored voltage data. When the voltage across the capacitor bank is too high, causing all warning lights 21 to illuminate, the warning light 8 illuminates, and simultaneously, the siren inside the warning light 8 sounds, alerting personnel around the machine 1. Under other voltage conditions, personnel can determine the voltage level by observing the number of illuminated external warning lights 21 and perform corresponding maintenance operations. The warning lights 8 and 21 can be connected to an external preset circuit for power supply.

[0068] When the capacitor 3 is placed or stored outside and not in use, the staff can remove the fixing plate 16 and place both ends of the fixing plate 16 on top of the capacitor 3, with both ends of the fixing plate 16 abutting against the inner wall of the groove on the top of the capacitor 3. The top ends of the two connecting rods 12 on the top of the capacitor 3 are inserted into the limiting groove 15 on the top of the fixing plate 16. The fixing plate 16 can protect and shield the top connection of the connecting rods 12 through the limiting groove 15, preventing the staff from colliding with the connecting rods 12 when placing and transporting the capacitor 3. It can provide good protection for the connecting rods 12 when in use.

[0069] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A transformer DC blocking device with capacitor self-test function, comprising a body (1), characterized in that, The body (1) is equipped with a capacitor bank, a zinc oxide bank and a bypass switch. The capacitor bank is electrically connected to the capacitor self-test module. The capacitor bank includes several capacitors (3). The transformer is connected in series with the capacitor bank through a wire. The capacitor bank and the zinc oxide bank are connected in parallel through a wire. The zinc oxide bank and the bypass switch are connected in parallel through a wire. The inner wall of the body (1) is equipped with an installation plate (2), and a number of capacitors (3) are installed on the top of the installation plate (2). Connecting rods (12) are installed at both ends of the top of the capacitors (3). Limiting holes are opened through the outer wall of the connecting rods (12). A protective shell (4) is installed above the capacitors (3), and the top of the capacitors (3) is located inside the protective shell (4). A number of connecting mechanisms are installed on the top of the capacitors (3). Mounting holes (5) are opened at both ends of the top of the body (1). Guide cylinders (6) are installed at both ends of the top of the protective shell (4). The top of the guide cylinder (6) passes through the mounting hole (5) and is equipped with a concave fixing plate (7). The fixing plate (7) is connected to the interior of the guide cylinder (6). The connecting mechanism includes a fixing plate (16), and both ends of the inner wall of the fixing plate (16) are provided with placement grooves (17). The fixing plate (16) is installed on the top of two adjacent capacitors (3), and the connecting rods (12) of the top of the two adjacent capacitors (3) near the fixing plate (16) are respectively located at the inner ends of the fixing plate (16). The inner ends of the fixing plate (16) are each equipped with a first screw (18). One end of the first screw (18) passes through the limiting hole and is installed on the fixing plate (16) by thread. The capacitor self-test module includes a data acquisition unit, a verification unit, a signal processing unit, and an early warning unit; The acquisition unit is used to acquire the real-time voltage across the capacitor bank and send the acquired real-time voltage to the verification unit. The verification unit is used to verify the accuracy of the received real-time voltage and send the verification result to the signal processing unit. The signal processing unit is used to receive the verification result, compare the verification result with the preset warning voltage value, determine the warning level, and send the warning level to the warning unit; The warning unit includes a warning light (8) and several warning lights (21). The warning unit determines the number of warning lights (21) to be activated based on the received warning level. When all the warning lights (21) are turned on, the warning light (8) will turn on automatically.

2. The transformer DC blocking device with capacitor self-test function according to claim 1, characterized in that, The process by which the verification unit verifies the accuracy of the received real-time voltage includes: The standard voltage value is calculated using preset voltage calculation rules; The preset voltage calculation rules include: ； The standard voltage value after verification of the voltage across the capacitor bank is the verification result. The voltage across the capacitor bank is the actual measured value, and E is the preset balance coefficient. When poor contact occurs in the capacitor bank, the measured and All are zero.

3. A transformer DC blocking device with capacitor self-test function according to claim 2, characterized in that, The process of determining the warning level based on the verification results includes: The verification result is compared with the preset warning voltage value, which includes U1, U2, U3, U4...Un; when For safety voltage levels, The voltage level is defined as a dangerous voltage level. Each warning level is defined by the interval between two adjacent warning voltage values, and each warning level includes the minimum endpoint of the interval. Alert level.

4. A transformer DC blocking device with capacitor self-test function according to claim 3, characterized in that, A second screw (22) is installed in the limiting hole on the two connecting rods (12) near the inner wall of the body (1). A connecting hole (23) is opened through one end of the second screw (22) near the inner wall of the body (1). An insulating pad (19) is installed on the first screw (18) and the second screw (22), and one side of the insulating pad (19) abuts against the outer wall of the connecting rod (12).

5. A transformer DC blocking device with capacitor self-test function according to claim 4, characterized in that, A rotating plate (9) is rotatably installed on one side of the protective shell (4). A limiting plate (14) is installed on the side of the rotating plate (9) near the capacitor (3). A number of limiting grooves (15) are equidistantly opened on the side of the limiting plate (14) near the capacitor (3), and the inner wall of the limiting groove (15) abuts against the outer wall of the capacitor (3).

6. A transformer DC blocking device with capacitor self-test function according to claim 5, characterized in that, The protective shell (4) has conductive plates (13) installed at both ends of its inner top. The bottom of the two conductive plates (13) abuts against the top of the two connecting rods (12) that are close to the inner walls of the body (1) on both sides. The top of the body (1) is equipped with a warning light (8), and a siren is installed inside the warning light (8). Several warning lights (21) are installed on the outer wall of the warning light (8). Several springs (10) are installed between the top of the protective shell (4) and the inner top of the body (1).

7. A transformer DC blocking device with capacitor self-test function according to claim 6, characterized in that, The guide cylinder (6) has through holes (11) on both sides of the bottom. The bottom of the fixed plate (7) has air vents (24) at both ends. A bracket (25) is installed on the inner wall of the fixed plate (7). A fan blade (27) is installed on the top of the bracket (25). A protective net (26) is installed on the top of the inner wall of the fixed plate (7), and the fan blade (27) is located below the protective net (26).

8. A transformer DC blocking device with capacitor self-test function according to claim 7, characterized in that, A placement plate (30) is installed on the inner wall of the body (1). A partition plate (29) is installed at one end of the placement plate (30) away from the inner wall of the body (1). The two ends of the partition plate (29) are respectively installed on the inner bottom of the body (1) and the opposite side of the installation plate (2). Several zinc oxide valve plate groups (20) are installed on the top of the placement plate (30) and the inner bottom of the body (1). A bypass switch box (28) is installed on the inner bottom of the body (1). The bypass switch box (28) and the zinc oxide valve plate groups (20) are located on both sides of the partition plate (29).

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