Digital self-healing low-voltage power capacitor

Abstract

The utility model relates to the technical field of power capacitors, and discloses a digital self-healing low-voltage power capacitor, which comprises a shell and a movable plate, an assembly frame is arranged beside the shell, at least two stacking frames are arranged in the shell, an outer frame is arranged in each stacking frame, and a capacitor core is arranged in each outer frame. A temperature sensor for monitoring the operating temperature of the capacitor core is arranged in the shell, and a metalized film for repairing the capacitor core is arranged in the outer frame. The self-healing repairing effect can be achieved through the metallized film in an auxiliary mode, when the capacitor core is subjected to electric breakdown, metal particles are directionally migrated and deposited in a damaged area under the action of an electric field, and self-recovery of the insulation performance is achieved. The movable plate and the clamping frame form a mechanical meshing structure through the protruding blocks, so that the assembly anti-shearing strength is improved. And through the synergistic effect, the electrical reliability of the capacitor unit is ensured, and the long-term stability of the mechanical structure is ensured.

Description

Technical Field

[0001] This utility model relates to the field of power capacitor technology, specifically to a digital self-healing low-voltage power capacitor. Background Technology

[0002] Digital self-healing low-voltage power capacitors, as an important power compensation device, play a key role in reactive power compensation and stable operation of power systems.

[0003] For example, the low-voltage self-healing reactive power compensation capacitor disclosed in Chinese Patent Publication No. CN206098160U is equipped with temperature and humidity sensors to detect the capacitor's operating temperature and humidity in a timely manner and display this information on an LED screen to prevent damage to the equipment. Indicator lights are also connected to monitor the capacitor's operating status. This existing device is fixed in an electrical cabinet using a mounting bracket and connected to an external circuit via terminals. However, in practical applications, although this device is equipped with safety protection devices such as temperature and humidity sensors and overpressure relief valves, its self-healing capability is often limited when a fault occurs inside the capacitor. Especially when the capacitor suffers damage such as electrical breakdown, if the self-healing response is not timely or effective, it may lead to a decrease in the internal insulation performance of the capacitor, or even cause a more serious failure. Utility Model Content

[0004] The purpose of this invention is to provide a digital self-healing low-voltage power capacitor. The self-healing effect can be assisted by a metallized film. When the capacitor core is subjected to electrical breakdown, the metal particles migrate directionally under the action of the electric field and deposit in the damaged area, thereby achieving autonomous recovery of insulation performance.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a digital self-healing low-voltage power capacitor, comprising a shell and a movable plate, wherein an assembly frame is provided on the side of the shell, and at least two stacking frames are provided inside the shell, each stacking frame having an outer frame, and a capacitor core is provided in the outer frame.

[0006] The housing is equipped with a temperature sensor for monitoring the operating temperature of the capacitor core.

[0007] The outer frame is provided with a metallized film for repairing the capacitor core.

[0008] Preferably, two assembly racks are provided, each with a connection hole. The two assembly racks are symmetrically distributed on both sides of the outer shell with the center line of the outer shell as the axis of symmetry.

[0009] Preferably, one end of the outer frame has a wire hole, and the other end of the outer frame is provided with an overpressure relief valve. The pressure relief channel of the overpressure relief valve is connected to the inside of the outer frame.

[0010] Preferably, the metallization film is disposed in the wire harness array of the capacitor core in any one or more combinations of wire harness gap filling, wire harness surface covering, and wire harness end sealing.

[0011] Preferably, the inner wall of the outer shell is fixed with two sets of card holders, and the bottom end of the movable plate is fixed with a plug-in plate that is plugged into and installed with the card holders.

[0012] Preferably, the contact surfaces of the card holder and the plug-in plate are provided with protrusions to improve friction.

[0013] Preferably, the movable plate is provided with a connecting panel, and at least three wiring terminals are provided on the outside of the connecting panel. The wiring terminals are connected by wires, and a discharge resistor is provided on the connected wires.

[0014] Preferably, the connection panel has a mounting slot, and the temperature sensor is located in the mounting slot.

[0015] Compared with the prior art, this utility model provides a digital self-healing low-voltage power capacitor, which has the following beneficial effects:

[0016] 1. This digital self-healing low-voltage power capacitor utilizes a metallized film to aid in self-healing. When the capacitor core experiences electrical breakdown, metal particles migrate directionally under the influence of an electric field and deposit in the damaged area, achieving autonomous restoration of insulation performance. This self-healing mechanism shortens fault repair time and reduces the risk of unplanned downtime. Simultaneously, the mechanical interlocking structure formed by the protrusions between the movable plate and the mounting bracket enhances the shear strength of the assembly, effectively resisting structural deformation caused by transportation vibrations and thermal expansion and contraction. The synergistic effect of these two mechanisms ensures both the electrical reliability of the capacitor unit and the long-term stability of the mechanical structure, thereby increasing the mean time between failures (MTBF) of this digital self-healing low-voltage power capacitor.

[0017] 2. This digital self-healing low-voltage power capacitor features a temperature sensor embedded in the mounting slot of the connection panel, enabling real-time acquisition and digital transmission of the capacitor core's operating temperature, thus identifying the risk of thermal runaway in advance. When the decomposition of the medium causes abnormal internal pressure, the overpressure relief valve automatically opens, releasing pressure and restoring the seal in a short time to prevent rupture. This dual-safety digital mechanism of monitoring and pressure relief enhances the equipment's safety level and improves fault protection response speed, making it suitable for industrial scenarios with stringent requirements for power supply continuity. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the three-dimensional structure of a digital self-healing low-voltage power capacitor according to this utility model. Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of a digital self-healing low-voltage power capacitor according to this utility model. Figure 2 ;

[0020] Figure 3 This is a schematic diagram of the internal structure of the outer shell of a digital self-healing low-voltage power capacitor according to the present invention.

[0021] Figure 4 This is a schematic diagram of the internal structure of the outer frame of a digital self-healing low-voltage power capacitor according to the present invention.

[0022] Figure 5 This is a schematic diagram of a partial disassembly of a digital self-healing low-voltage power capacitor according to the present invention.

[0023] In the diagram: 1. Outer shell; 2. Assembly frame; 21. Connecting hole; 31. Stacking rack; 32. Outer frame; 321. Capacitor core; 322. Metallized film; 323. Wiring hole; 324. Overpressure relief valve; 41. Card holder; 42. Movable plate; 421. Plug-in plate; 422. Protrusion block; 51. Connecting panel; 52. Temperature sensor; 53. Wiring terminal; 54. Discharge resistor. Detailed Implementation

[0024] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0025] Example 1: Please refer to Figures 1-4 This utility model provides a technical solution: a digital self-healing low-voltage power capacitor, including a housing 1 and a movable plate 42. An assembly frame 2 is arranged on the side of the housing 1, and four stacking frames 31 are arranged inside the housing 1. Each stacking frame 31 has an outer frame 32, and a capacitor core 321 is arranged in the outer frame 32. Through the combination design of the modular stacking frame 31 and the outer frame 32, the capacitor unit is compactly arranged, which increases the capacitance density per unit volume, and facilitates independent replacement of faulty units, reducing maintenance costs.

[0026] Furthermore, there are two assembly racks 2, each with a connection hole 21. The two assembly racks 2 are symmetrically distributed on both sides of the outer casing 1 with the center line of the outer casing 1 as the axis of symmetry. The symmetrical double assembly rack 2 structure allows the equipment to be installed in the low-voltage capacitor cabinet from both directions, adapting to different cabinet layout requirements.

[0027] Furthermore, a wire-passing hole 323 is provided at one end of the outer frame 32. The wire-passing hole 323 is configured to allow the lead wires 321a of the capacitor core 321 to pass through and form an electrical connection with the external terminal 53. An overpressure relief valve 324 is provided at the other end of the outer frame 32. The pressure relief channel of the overpressure relief valve 324 is connected to the inside of the outer frame 32. This facilitates rapid pressure relief and reduces the possibility of damage to the capacitor core 321.

[0028] Furthermore, a metallization film 322 for repairing the capacitor core 321 is disposed within the outer frame 32. The metallization film 322 is disposed in the wire harness array of the capacitor core 321 in a manner that fills the wire harness gaps. The flexible-filled metallization film 322 is typically made by depositing metal particles (such as zinc, aluminum, etc.) on an insulating material (such as a polypropylene film). Under normal circumstances, these metal particles are non-conductive, and the film remains in an insulating state. When the capacitor core 321 is subjected to voltage fluctuations, overloads, or electrical breakdowns during operation, the capacitor core 321 may be damaged. When damage occurs, the electric field strength in the damaged area increases. Under the action of a strong electric field, the metal particles in the metallization film 322 begin to redistribute and move towards the damaged area. These metal particles accumulate in the damaged area and form conductive channels. The formation of conductive channels triggers a self-healing reaction. Under the action of the electric field, the metal particles continue to deposit into the damaged area, gradually filling the damaged area. As metal particles are deposited, the conductivity of the damaged area gradually decreases, and the electric field strength also weakens. When the damaged area is completely filled by metal particles, the conductive channel disappears, the insulation performance of capacitor core 321 is restored, the service life of the capacitor is extended, and the reliability and stability are improved.

[0029] Furthermore, the movable plate 42 is provided with a connection panel 51, and at least three wiring terminals 53 are provided on the outside of the connection panel 51. The wiring terminals 53 are connected by wires, and a discharge resistor 54 is provided on the connected wires. The integrated design of the discharge resistor 54 and the wiring terminals 53 can suppress the closing inrush current, meet the standard requirements, and at the same time reduce the number of external components and reduce the system complexity.

[0030] Furthermore, a temperature sensor 52 for monitoring the operating temperature of the capacitor core 321 is provided in the housing 1. A mounting slot is provided in the connection panel 51, and the temperature sensor 52 is located in the mounting slot. The embedded installation of the temperature sensor 52 improves the temperature measurement accuracy and avoids damage from external forces. The traceability of historical data supports the prediction of the capacitor's health status and reduces the number of unexpected downtimes.

[0031] Example 2: Please refer to Figure 5Furthermore, in conjunction with Embodiment 1, two sets of card holders 41 are fixed to the inner wall of the outer shell 1, and a plug-in plate 421 for plugging into and installing with the card holders 41 is fixed to the bottom end of the movable plate 42. The contact surfaces of the card holders 41 and the plug-in plate 421 are both provided with protrusions 422 to improve friction. The mechanical interlocking design of the protrusions 422 enhances the shear strength of the card holders 41 and the plug-in plate 421, avoiding poor contact problems caused by transportation impacts.

[0032] In actual operation, during assembly, the capacitor core 321 is first installed into the outer frame 32. The filling method of the metallized film 322 is selected according to the wire harness array structure; gap filling can be used to complete the dielectric repair layer. The assembled outer frame 32 is embedded into the stacking rack 31, and multiple stacking racks 31 are vertically stacked inside the outer casing 1 according to the designed number of layers to form a capacitor unit array. Then, the movable plate 42 is connected to the bracket 41 on the inner wall of the outer casing 1 via the plug-in plate 421. The mechanical interlocking structure of the protrusion 422 improves shear strength and ensures structural stability during transportation and operation. After the connecting panel 51 is fixed to the movable plate 42, the lead wires of the capacitor core 321 are passed through the wire hole 323 and electrically connected to the terminal block 53 on the connecting panel 51. The matching discharge resistor 54 suppresses inrush current. Finally, the temperature sensor 52 is embedded into the reserved mounting slot of the connecting panel 51, completing the deployment of the digital monitoring system. The outer casing 1 achieves standardized installation through the symmetrical connecting holes 21 on both sides of the assembly rack 2.

[0033] During operation, when the capacitor core 321 experiences electrical breakdown or overload impact, the electric field distortion in the damaged area triggers a self-healing mechanism: metal particles in the metallization film 322 migrate towards the defect under the influence of a strong electric field, forming a conductive channel that induces local melting. Metal vapor, driven by the electric field, is directionally deposited into the breakdown channel, rebuilding the dielectric isolation layer. As the thickness of the deposited layer increases, the local electric field strength gradually decreases to below the safe threshold, completing the autonomous recovery of insulation performance. Temperature sensor 52 collects core temperature data in real time and transmits it to the monitoring system via a digital interface. If extreme conditions such as dielectric decomposition cause an abnormal increase in internal pressure, the pressure relief channel of the overpressure relief valve 324 automatically opens, releasing the overpressure gas. After the overpressure relief valve 324 is released, its sealing structure automatically resets, ensuring safe operation of the equipment.

[0034] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A digital self-healing low-voltage power capacitor, comprising a housing (1) and a movable plate (42), characterized in that, An assembly rack (2) is provided on the side of the outer casing (1). At least two stacking racks (31) are provided inside the outer casing (1). Each stacking rack (31) is provided with an outer frame (32). A capacitor core (321) is provided in the outer frame (32). A temperature sensor (52) for monitoring the operating temperature of the capacitor core (321) is provided in the outer casing (1). A metallized film (322) for repairing the capacitor core (321) is provided in the outer frame (32).

2. The digital self-healing low-voltage power capacitor according to claim 1, characterized in that: There are two assembly frames (2), and each assembly frame (2) has a connection hole (21); the two assembly frames (2) are symmetrically distributed on both sides of the outer shell (1) with the center line of the outer shell (1) as the axis of symmetry.

3. The digital self-healing low-voltage power capacitor according to claim 1, characterized in that: One end of the outer frame (32) is provided with a wire hole (323), and the other end of the outer frame (32) is provided with an overpressure relief valve (324); the pressure relief channel (324a) of the overpressure relief valve (324) is connected to the inside of the outer frame (32).

4. A digital self-healing low-voltage power capacitor according to claim 1, characterized in that: The metallization film (322) is disposed in the wire harness array of the capacitor core (321) in any one or more combinations of wire harness gap filling, wire harness surface covering, and wire harness end sealing.

5. A digital self-healing low-voltage power capacitor according to claim 1, characterized in that: Two sets of card holders (41) are fixed on the inner wall of the outer shell (1), and a plug plate (421) that is plugged into and installed with the card holders (41) is fixed at the bottom of the movable plate (42).

6. A digital self-healing low-voltage power capacitor according to claim 5, characterized in that: The contact surfaces of the card holder (41) and the plug plate (421) are provided with protrusions (422) to improve friction.

7. A digital self-healing low-voltage power capacitor according to claim 1, characterized in that: The movable plate (42) is provided with a connecting panel (51), and at least three wiring terminals (53) are provided outside the connecting panel (51). The wiring terminals (53) are connected by wires, and a discharge resistor (54) is provided on the connected wires.

8. A digital self-healing low-voltage power capacitor according to claim 7, characterized in that: The connection panel (51) has an installation slot, and the temperature sensor (52) is located in the installation slot.

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