Reinforced insulation high-voltage-resistant composite ceramic capacitor and high-voltage solid-sealed polar pole

Abstract

The utility model discloses a reinforced insulation high-voltage-resistant composite ceramic capacitor and a high-voltage solid-sealed polar pole. The reinforced insulation high-voltage-resistant composite ceramic capacitor comprises a first high-voltage ceramic capacitor, a second high-voltage ceramic capacitor and a third high-voltage ceramic capacitor which are connected in sequence, the top end of the first high-voltage ceramic capacitor is provided with a first metal electrode plate which is fit and fixedly connected with the top surface of a core body of the first high-voltage ceramic capacitor, and the bottom surface of the core body of the first high-voltage ceramic capacitor is fit and connected with the top surface of the second metal electrode plate. The top surface of the core body of the second high-voltage ceramic capacitor is in fit connection with the bottom surface of the second metal electrode plate; the bottom surface of the core body of the second high-voltage ceramic capacitor is in fit connection with the top surface of the third metal electrode plate, and the top surface of the core body of the third high-voltage ceramic capacitor is in fit connection with the bottom surface of the third metal electrode plate. And the bottom end of the third high-voltage ceramic capacitor is a fourth metal pole plate which is in fit and attached connection with the bottom surface of the core body of the third high-voltage ceramic capacitor. The utility model has the technical advantages of compact structure and high pressure resistance.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage composite ceramic capacitors, in particular to a voltage sensor at the high-voltage end of a high-voltage solid-sealed pole column. Background Art

[0002] The high-voltage deep-fusion solid-sealed pole column adopts an epoxy resin encapsulation technology, integrating a vacuum interrupter, a voltage sensor, etc., to realize the opening and closing of high-voltage lines, voltage detection, etc. It has a compact structure, light weight, and requires no maintenance, meeting the needs of the development of distribution network automation, miniaturization, and intellectualization. In practical applications, the capacitive sensor used for voltage detection at the high-voltage end in the high-voltage deep-fusion solid-sealed pole column adopts a traditional high-voltage ceramic capacitor. Due to the limited space inside the solid-sealed pole column housing, the volume of the high-voltage ceramic capacitor is also limited, resulting in limited voltage resistance. During the process of repeatedly closing and opening the solid-sealed pole column, the voltage with too high an impact during the operation instant may break down the high-voltage ceramic capacitor, leading to relatively serious accidents.

[0003] In addition, the bonding performance between the traditional high-voltage ceramic capacitor and the epoxy resin used for its solid sealing cannot be effectively guaranteed, and it is difficult to ensure the electrical insulation performance and partial discharge performance of the high-voltage ceramic capacitor. Therefore, it also increases the probability of breakdown of the high-voltage ceramic capacitor under high voltage.

[0004] In addition, the traditional high-voltage ceramic capacitor is sensitive to the external temperature, which easily causes the voltage error measured by the voltage sensor at the high-voltage end in the solid-sealed pole column to exceed the specified value. Summary of the Utility Model

[0005] To solve the technical problems existing in the background art, the utility model proposes a reinforced insulation high-voltage resistant composite ceramic capacitor and a high-voltage solid-sealed pole column with high voltage resistance, a compact structure, good electrical performance, and self-temperature compensation.

[0006] The reinforced insulation high-voltage resistant composite ceramic capacitor includes: a first high-voltage ceramic capacitor, a second high-voltage ceramic capacitor, and a third high-voltage ceramic capacitor connected in sequence; the top end of the first high-voltage ceramic capacitor is a first metal electrode plate that is adaptively and fixedly connected to the top surface of the core body of the first high-voltage ceramic capacitor, the bottom surface of the core body of the first high-voltage ceramic capacitor is adaptively and connected to the top surface of the second metal electrode plate, and the top surface of the core body of the second high-voltage ceramic capacitor is adaptively and connected to the bottom surface of the second metal electrode plate; the bottom surface of the core body of the second high-voltage ceramic capacitor is adaptively and connected to the top surface of the third metal electrode plate, the top surface of the core body of the third high-voltage ceramic capacitor is adaptively and connected to the bottom surface of the third metal electrode plate, and the bottom end of the third high-voltage ceramic capacitor is a fourth metal electrode plate that is adaptively and connected to the bottom surface of the core body of the third high-voltage ceramic capacitor.

[0007] Preferably, there is a circle of first protrusions extending upward around the top surface periphery of the core body of the second high-voltage ceramic capacitor, the height of the first protrusions is not higher than that of the first high-voltage ceramic capacitor, the material of the first protrusions is ceramic, and there is a first gap between the first protrusions and the outer peripheral surface of the first high-voltage ceramic capacitor.

[0008] Preferably, there is a circle of second protrusions extending downward around the bottom surface periphery of the core body of the second high-voltage ceramic capacitor, the height of the second protrusions is not lower than that of the third high-voltage ceramic capacitor, the material of the second protrusions is ceramic, and there is a second gap between the second protrusions and the outer peripheral surface of the third high-voltage ceramic capacitor.

[0009] Preferably, the ceramic substrates of the first high-voltage ceramic capacitor and the third high-voltage ceramic capacitor are of negative temperature coefficient material, and the ceramic substrate of the third high-voltage ceramic capacitor is of positive temperature coefficient material.

[0010] Preferably, the materials of the first metal electrode plate and the fourth metal electrode plate are silver.

[0011] Preferably, the materials of the second metal electrode plate and the third metal electrode plate are stainless steel. The bottom surface of the core body of the first high-voltage ceramic capacitor and the top surface of the core body of the second high-voltage ceramic capacitor are welded together with the second metal electrode plate by silver-copper solder; the bottom surface of the core body of the second high-voltage ceramic capacitor and the top surface of the core body of the third high-voltage ceramic capacitor are welded together with the third metal electrode plate by silver-copper solder.

[0012] A high-voltage solid-sealed pole column, and the voltage sensor at the high-voltage end of the high-voltage solid-sealed pole column is any one of the enhanced insulation and high-voltage resistant composite ceramic capacitors in the above technical solutions.

[0013] The beneficial effects of the present utility model are as follows:

[0014] The enhanced insulation and high-voltage resistant composite ceramic capacitor is a structurally compact integrated series capacitor, which saves installation space. Since the total voltage that can be borne between the external electrode plates of the capacitors after being connected in series is the sum of the voltages that the first high-voltage ceramic capacitor 1, the second high-voltage ceramic capacitor 2, and the third high-voltage ceramic capacitor 3 can bear, therefore, the voltage resistance ability of the capacitors after being connected in series is greatly increased, and the accident rate of the capacitors being broken down during use is effectively reduced.

[0015] The first protrusions, the second protrusions, the first gap, and the second gap made of ceramic material of the enhanced insulation and high-voltage resistant composite ceramic capacitor can increase the creepage distance, enhance the insulation performance of the enhanced insulation and high-voltage resistant composite ceramic capacitor, and reduce partial discharge.

[0016] The ceramic substrates of the first high-voltage ceramic capacitor and the third high-voltage ceramic capacitor are of negative temperature coefficient material, and the ceramic substrate of the third high-voltage ceramic capacitor is of positive temperature coefficient material. This structural configuration enables the enhanced insulation high-voltage composite ceramic capacitor to have temperature compensation itself. When used as a voltage sensor, it can ensure that the error of the measured voltage signal is not too large and guarantee the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. 1 is a schematic structural diagram of the enhanced insulation high-voltage composite ceramic capacitor in the top view direction.

[0018] Figure 2 FIG. 2 Figure 1 is a schematic structural diagram in the A-A direction.

[0019] Figure 3 FIG. 3 is a schematic structural diagram of the enhanced insulation high-voltage composite ceramic capacitor in the front view direction. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The present invention will be described in detail below with reference to the accompanying drawings.

[0021] As Figures 1 to 3 shown, the enhanced insulation high-voltage composite ceramic capacitor includes: a first high-voltage ceramic capacitor 1, a second high-voltage ceramic capacitor 2, and a third high-voltage ceramic capacitor 3 connected in sequence; the top end of the first high-voltage ceramic capacitor 1 is a first metal electrode plate 12 that is adaptively and fixedly connected to the top surface of the core 11 of the first high-voltage ceramic capacitor. The bottom surface of the core 11 of the first high-voltage ceramic capacitor is adaptively and fittingly connected to the top surface of the second metal electrode plate 4. The top surface of the core 21 of the second high-voltage ceramic capacitor is adaptively and fittingly connected to the bottom surface of the second metal electrode plate 4; the bottom surface of the core 21 of the second high-voltage ceramic capacitor is adaptively and fittingly connected to the top surface of the third metal electrode plate 5. The top surface of the core 31 of the third high-voltage ceramic capacitor is adaptively and fittingly connected to the bottom surface of the third metal electrode plate 5. The bottom end of the third high-voltage ceramic capacitor 3 is a fourth metal electrode plate 32 that is adaptively and fittingly connected to the bottom surface of the core 31 of the third high-voltage ceramic capacitor.

[0022] The first high-voltage ceramic capacitor 1 and the second high-voltage ceramic capacitor 2 are connected together through a common second metal electrode plate 4, and the second high-voltage ceramic capacitor 2 and the third high-voltage ceramic capacitor 3 are connected together through a common third metal electrode plate 5. Thus, the first high-voltage ceramic capacitor 1, the second high-voltage ceramic capacitor 2, and the third high-voltage ceramic capacitor 3 form a structurally compact integrated series capacitor. The first metal electrode plate 12 on the first high-voltage ceramic capacitor 1 and the fourth metal electrode plate 32 on the third high-voltage ceramic capacitor 3 form the external electrode plates of this series capacitor. Since the total voltage that can be borne between the external electrode plates of the series capacitor is the sum of the voltages that the first high-voltage ceramic capacitor 1, the second high-voltage ceramic capacitor 2, and the third high-voltage ceramic capacitor 3 can bear, therefore, the voltage resistance ability of the series capacitor is greatly increased, effectively reducing the accident rate of the capacitor being broken down during use.

[0023] As Figure 2 shown, there is a ring of first protrusions 22 extending upward around the top surface periphery of the core body of the second high-voltage ceramic capacitor 2, and the height of the first protrusions 22 is not higher than that of the first high-voltage ceramic capacitor 1. The material of the first protrusions 22 is ceramic, and a first gap 6 is left between the first protrusions 22 and the outer peripheral surface of the first high-voltage ceramic capacitor 1.

[0024] The ceramic first protrusions 22 can play a good role in external insulation for the first high-voltage ceramic capacitor 1 and the second high-voltage ceramic capacitor 2 in the enhanced insulation high-voltage resistant composite ceramic capacitor, increasing the creepage distance. When encapsulating the enhanced insulation high-voltage resistant composite ceramic capacitor, epoxy resin can be injected into the first gap 6, which not only increases the connection strength and sealing performance of the overall structure of the enhanced insulation high-voltage resistant composite ceramic capacitor, but also can further enhance the insulation performance of the high-voltage composite ceramic capacitor.

[0025] As Figure 2 shown, there is a ring of second protrusions 23 extending downward around the bottom surface periphery of the core body of the second high-voltage ceramic capacitor 2, and the height of the second protrusions 23 is not lower than that of the third high-voltage ceramic capacitor 3. The material of the second protrusions 23 is ceramic, and a second gap 7 is left between the second protrusions 23 and the outer peripheral surface of the third high-voltage ceramic capacitor 3.

[0026] The ceramic second protrusions 23 can play a good role in external insulation for the second high-voltage ceramic capacitor 1 and the third high-voltage ceramic capacitor 3 in the enhanced insulation high-voltage resistant composite ceramic capacitor, increasing the creepage distance. When encapsulating the enhanced insulation high-voltage resistant composite ceramic capacitor, epoxy resin can be injected into the second gap 7, which not only increases the connection strength and sealing performance of the overall structure of the enhanced insulation high-voltage resistant composite ceramic capacitor, but also can further enhance the insulation performance of the high-voltage composite ceramic capacitor.

[0027] The ceramic substrates of the first high-voltage ceramic capacitor 1 and the third high-voltage ceramic capacitor 3 are of negative temperature coefficient materials, and the ceramic substrate of the third high-voltage ceramic capacitor 3 is of positive temperature coefficient material.

[0028] Since temperature changes can cause the dielectric constant of the ceramic substrate to change, the capacitance of the capacitor will also change. The enhanced insulation and high-voltage resistant composite ceramic capacitor with a series structure using two ceramic materials with opposite temperature coefficients can minimize or even cancel out the capacitance change caused by heating or cooling inside, so that the overall capacitance of the enhanced insulation and high-voltage resistant composite ceramic capacitor will not change too much due to temperature changes. In practical applications, in view of the current state of the technology for manufacturing ceramic capacitors, the enhanced insulation and high-voltage resistant composite ceramic capacitor can meet the requirement that the capacitance does not fluctuate too much within the temperature range of -40°C to 70°C.

[0029] The materials of the first metal electrode plate 12 and the fourth metal electrode plate 32 are silver.

[0030] The first metal electrode plate 12 and the fourth metal electrode plate 32 are made of metal silver with good electrical conductivity and chemical stability. In practical applications, the first metal electrode plate 12 and the fourth metal electrode plate 32 can be manufactured by evaporation coating.

[0031] The materials of the second metal electrode plate 4 and the third metal electrode plate 5 are stainless steel. The bottom surface of the core 11 of the first high-voltage ceramic capacitor and the top surface of the core 21 of the second high-voltage ceramic capacitor are welded to the second metal electrode plate 4 through silver-copper solder; the bottom surface of the core 21 of the second high-voltage ceramic capacitor and the top surface of the core 31 of the third high-voltage ceramic capacitor are welded to the third metal electrode plate 5 through silver-copper solder.

[0032] Silver-copper solder has the advantages of high welding strength, low solder joints, and high cost performance, and the metal silver in it has excellent electrical conductivity. Therefore, silver-copper solder can firmly connect the core 11 of the first high-voltage ceramic capacitor, the second metal electrode plate 4, the core 21 of the second high-voltage ceramic capacitor, the third metal electrode plate 5, and the core 31 of the third high-voltage ceramic capacitor together, and can enhance the electrical conductivity of the second metal electrode plate 4 and the third metal electrode plate 5. In practical applications, the core 11 of the first high-voltage ceramic capacitor, the second metal electrode plate 4, the core 21 of the second high-voltage ceramic capacitor, the third metal electrode plate 5, and the core 31 of the third high-voltage ceramic capacitor bonded together through silver-copper solder can be placed in a vacuum high-temperature furnace and fired at 900°C for 4 hours, and then cooled by filling with nitrogen for 4 hours to make the enhanced insulation and high-voltage resistant composite ceramic capacitor.

[0033] A high-voltage solid-sealed terminal post, and the voltage sensor at the high-voltage end of the high-voltage solid-sealed terminal post is any one of the enhanced insulation and high-voltage resistant composite ceramic capacitors in the above embodiments.

[0034] The high-voltage composite ceramic capacitor with enhanced insulation in series structure can withstand a much higher voltage compared with the traditional high-voltage ceramic capacitor used in the high-voltage solid-sealed pole column. It not only increases the voltage resistance of the voltage sensor in the high-voltage solid-sealed pole column, making it less likely to be broken down by the working voltage or instantaneous overvoltage in the solid-sealed pole column, but also improves the safety and working reliability of the solid-sealed pole column. Moreover, the high-voltage composite ceramic capacitor with enhanced insulation uses coupled second metal electrode plates 2 and third metal electrode plates 5 connected by silver-copper solder between adjacent capacitors, and can be integrally formed through sintering process technology. It has a compact structure, does not occupy too much installation space in the solid-sealed pole column housing, has high connection strength, a long service life, and reliable electrical performance. In practical applications, the high-voltage composite ceramic capacitor with enhanced insulation can be applied to the voltage acquisition device at the high-voltage end of the pole-mounted circuit breaker for deep integration of 12 kV overhead line AC distribution network.

[0035] In addition, the first gap 6 and the second gap 7 of the high-voltage composite ceramic capacitor with enhanced insulation can be reserved. After the high-voltage composite ceramic capacitor with enhanced insulation is installed in the high-voltage solid-sealed pole column, epoxy resin integrally connected with the epoxy resin housing of the high-voltage solid-sealed pole column is injected into it, thereby increasing the external insulation of the high-voltage composite ceramic capacitor with enhanced insulation and reducing the occurrence of partial discharge phenomena.

[0036] Because the ceramic substrates of the first high-voltage ceramic capacitor 1 and the third high-voltage ceramic capacitor 3 are of negative temperature coefficient materials, and the ceramic substrate of the third high-voltage ceramic capacitor 3 is of positive temperature coefficient material, the high-voltage composite ceramic capacitor with enhanced insulation has its own temperature compensation. When used as a voltage sensor, it can ensure that the error of the measured voltage signal is not too large and guarantee the measurement accuracy.

[0037] As mentioned above, the above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A reinforced insulation high voltage resistant composite ceramic capacitor, characterized in that: It comprises: a first high-voltage ceramic capacitor (1), a second high-voltage ceramic capacitor (2), and a third high-voltage ceramic capacitor (3) which are connected in sequence; The top of the first high-voltage ceramic capacitor (1) is a first metal electrode plate (12) that is fitted and fixedly connected to the top surface of the core (11) of the first high-voltage ceramic capacitor, the bottom surface of the core (11) of the first high-voltage ceramic capacitor is fitted and connected to the top surface of the second metal electrode plate (4), and the top surface of the core (21) of the second high-voltage ceramic capacitor is fitted and connected to the bottom surface of the second metal electrode plate (4); The bottom surface of the core (21) of the second high-voltage ceramic capacitor is connected to the top surface of the third metal electrode plate (5) in an adaptively fitting manner, the top surface of the core (31) of the third high-voltage ceramic capacitor is connected to the bottom surface of the third metal electrode plate (5) in an adaptively fitting manner, and the bottom end of the third high-voltage ceramic capacitor (3) is a fourth metal electrode plate (32) connected to the bottom surface of the core (31) of the third high-voltage ceramic capacitor in an adaptively fitting manner.

2. The reinforced insulation high voltage resistant composite ceramic capacitor according to claim 1, characterized in that: The top surface of the core of the second high-voltage ceramic capacitor (2) is surrounded by a circle of first protrusions (22) extending upward and not higher than the first high-voltage ceramic capacitor (1); the first protrusions (22) are made of ceramic; and a first gap (6) is left between the first protrusions (22) and the outer peripheral surface of the first high-voltage ceramic capacitor (1).

3. The reinforced insulation high voltage resistant composite ceramic capacitor according to claim 1, characterized in that: The bottom surface of the core of the second high-voltage ceramic capacitor (2) is surrounded by a circle of second protrusions (23) extending downward and not lower than the third high-voltage ceramic capacitor (3); the first protrusions (23) are made of a material such that a second gap (7) is left between the second protrusions (23) and the outer peripheral surface of the third high-voltage ceramic capacitor (3).

4. The reinforced insulation high voltage resistant composite ceramic capacitor according to claim 1, characterized in that: The ceramic substrates of the first high-voltage ceramic capacitor (1) and the third high-voltage ceramic capacitor (3) are made of materials with negative temperature coefficients, and the ceramic substrate of the third high-voltage ceramic capacitor (3) is made of materials with positive temperature coefficients.

5. The reinforced insulation high voltage resistant composite ceramic capacitor according to claim 1, characterized in that: The first metal electrode plate (12) and the fourth metal electrode plate (32) are made of silver.

6. The reinforced insulation high voltage resistant composite ceramic capacitor according to claim 1, characterized in that: The second metal electrode plate (4) and the third metal electrode plate (5) are made of stainless steel; the bottom surface of the core body (11) of the first high-voltage ceramic capacitor and the top surface of the core body (21) of the second high-voltage ceramic capacitor are welded to the second metal electrode plate (4) via silver-copper solder; and the bottom surface of the core body (21) of the second high-voltage ceramic capacitor and the top surface of the core body (31) of the third high-voltage ceramic capacitor are welded to the third metal electrode plate (5) via silver-copper solder.

7. A high voltage sealed pole, characterized in that: The voltage sensor at the high-voltage end of the high-voltage sealed pole is any one of the reinforced insulation high-voltage resistant composite ceramic capacitors in claims 1 to 6.

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