Solid-sealed polar pole

Abstract

The utility model relates to the technical field of electric power, in particular to a solid-sealed polar pole, which is applied to a medium-voltage power grid and used for extracting current signals, voltage signals and a power-taking power supply from the medium-voltage power grid, and further comprises a vacuum arc-extinguishing chamber, the transition piece and the spring contact finger are movably connected to the output end of the vacuum arc-extinguishing chamber; the conducting rod is connected with the spring contact finger and extends to the wire outlet side of the medium-voltage power grid; the current and voltage sensor group comprises an incoming line side voltage sensor of which the high-voltage end is connected with the incoming line side of the medium-voltage power grid and the low-voltage end is grounded; the high-voltage end of the wire outlet side voltage sensor is connected with the conducting rod, and the low-voltage end is grounded; the zero sequence current sensor and the phase current sensor are sleeved on the conducting rod; the high-voltage low-temperature-drift ceramic capacitor is adopted, one-time integral solid sealing is achieved, meanwhile, the current and voltage sensor set and the capacitor electricity-taking power source set are integrated, one-time integral solid sealing is achieved, the manufacturing process is simplified, and the insulation reliability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power, in particular to a sealed pole. Background Art

[0002] As the crucial foundation of the Energy Internet, the security and reliability of distribution networks are crucial to the quality of power supply services. The integration of new loads, such as distributed energy resources and electric vehicles, has placed higher demands on the intelligence of distribution networks. Smart terminals are key to achieving this. As core components of medium-voltage switchgear, the performance of sealed poles directly impacts the operational reliability of distribution networks.

[0003] Existing sealed poles usually need to integrate current and voltage sensors as well as power supply devices that provide working power for smart terminals. However, in the prior art, the high-voltage capacitors of the voltage sensors used inside the sealed poles are mostly thin-film capacitors. There are some inherent disadvantages of film capacitors. For example, their operating temperature range is relatively low, which does not match the curing temperature of the epoxy resin in the manufacturing process of the sealed poles. As a result, the film capacitors cannot be sealed with the epoxy resin as a whole in one go, but need to be potted twice, which increases the complexity of the manufacturing process and may introduce insulation defects, affecting the reliability and service life of the product. In addition, the temperature drift of the film capacitor is large, and its capacitance value is significantly affected by the ambient temperature, making it difficult to ensure the accuracy of the voltage signal sampling, thereby affecting the measurement accuracy. The service life of the film capacitor is relatively short, and it may also become a bottleneck for the life of the entire sealed pole.

[0004] At the same time, existing technologies often separate current and voltage signal acquisition and power supply functions across different components, resulting in low integration and increased equipment complexity and difficulty in installation and maintenance. The challenge facing current technology is how to effectively integrate these functions into the sealed pole and achieve a single, integrated package while ensuring insulation performance and reliability.

[0005] In view of the above problems, the existing technology is in urgent need of improvement. Utility Model Content

[0006] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a sealed pole.

[0007] In order to achieve the above objectives, the technical solution adopted by the present invention is: a sealed pole, which is applied to the medium-voltage power grid to extract current signals, voltage signals and power supply from the medium-voltage power grid, and also includes: a vacuum interrupter, the input end of which is connected to the incoming line side of the medium-voltage power grid; a transition piece and a spring contact finger, which are movably connected to the output end of the vacuum interrupter; a conductive rod, which is connected to the spring contact finger and extends to the outgoing line side of the medium-voltage power grid; a current and voltage sensor group, including: an incoming line voltage sensor, the high-voltage end of which is connected to the incoming line side of the medium-voltage power grid and the low-voltage end is grounded; an outgoing line voltage sensor, the high-voltage end of which is connected to the conductive rod. The low-voltage end of the pole is grounded; the zero-sequence current sensor and phase current sensor are mounted on the conductive pole; the high-voltage, low-temperature drift ceramic capacitor is integrated into the incoming and outgoing voltage sensors; the capacitor power supply group extracts the working power from the medium-voltage power grid and is connected to the incoming or outgoing side; the bottom plate fastening assembly is connected to the circuit breaker casing and the ground; the epoxy resin is used to seal the vacuum interrupter, transition piece, spring contact finger, conductive pole, current and voltage sensor group, capacitor power supply group and bottom plate fastening assembly at one time; the silicone rubber is coated on the outer layer of epoxy resin to protect against ultraviolet rays.

[0008] Furthermore, the present application also proposes that the circuit topology of the capacitor-powered power supply group includes a first topology or a second topology.

[0009] Furthermore, the present application also proposes that the first topology is connected to the incoming line side of the medium voltage power grid, in parallel with the vacuum interrupter, and simultaneously supplies power to the vacuum interrupter, the capacitor power supply group and the incoming line side voltage sensor.

[0010] Furthermore, the present application also proposes that the second topology is connected to the outgoing line side of the conductive rod and is connected in parallel with the outgoing line side voltage sensor.

[0011] Furthermore, the present application also proposes that the circuit connection of the current and voltage sensor group includes: a zero-sequence current sensor and a phase current sensor in parallel with a current sensor sampling resistor to convert the current signal into a voltage signal; a current and voltage sensor circuit board integrated signal conditioning circuit, connecting the sampling resistor and the incoming line side voltage sensor and the outgoing line side voltage sensor.

[0012] Furthermore, the present application also proposes that the current and voltage sensor group also includes a current and voltage sensor fixing member, which is used to fix the sensor assembly.

[0013] Furthermore, the present application also proposes that the current and voltage sensor group outputs a detection signal through a current and voltage sensor aviation socket.

[0014] Furthermore, the present application also proposes that the capacitor power supply group outputs power through an aviation socket, and the power supply position can be selected from the input side or the output side.

[0015] Furthermore, the present application also proposes that the thickness of the silicone rubber layer is 1-5 mm and has an IP68 protection grade.

[0016] Furthermore, the present application also proposes that the base plate fastening assembly is also a grounding terminal, which is connected to the circuit breaker housing and the main grounding bar of the building through a copper wire.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] By adopting high-voltage, low-temperature drift ceramic capacitors and achieving one-time overall sealing, and integrating a current and voltage sensor group and a capacitor power supply group, it has the advantages of achieving one-time overall sealing, simplifying the manufacturing process, improving insulation reliability, extending service life, improving voltage signal sampling accuracy, improving measurement accuracy, and improving integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a cross-sectional view of the solid-sealed pole of the utility model Figure 1 .

[0020] Figure 2 This is a cross-sectional view of the solid-sealed pole of the utility model Figure 2 .

[0021] Figure 3 This is a schematic diagram of the principle of the line-side power-taking solid-sealed pole of the utility model.

[0022] Figure 4 This is a schematic diagram of the principle of the outgoing-side power-taking solid-sealed pole of the present utility model.

[0023] In the figure: 1. Vacuum interrupter; 2. Transition piece; 3. Spring contact; 4. Guide pole; 5. Incoming voltage sensor; 6. Outgoing voltage sensor; 7. Zero-sequence current sensor; 8. Phase current sensor; 9. Silicone rubber; 10. Current and voltage sensor fixing parts. DETAILED DESCRIPTION

[0024] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0025] like Figures 1 to 4 The encapsulated pole shown is applied to a medium voltage power grid to extract current and voltage signals and power from the medium voltage power grid, and also includes:

[0026] The input end of vacuum interrupter 1 is connected to the incoming line side of the medium voltage power grid;

[0027] The transition piece 2 and the spring contact finger 3 are movably connected to the output end of the vacuum interrupter 1;

[0028] Conductive rod 4, connected to spring contact finger 3 and extending to the outlet side of the medium voltage grid;

[0029] The current and voltage sensor group includes: an incoming voltage sensor 5, with the high-voltage end connected to the incoming side of the medium-voltage power grid and the low-voltage end grounded; an outgoing voltage sensor 6, with the high-voltage end connected to the conductive rod 4 and the low-voltage end grounded; a zero-sequence current sensor 7 and a phase current sensor 8, which are sleeved on the conductive rod 4; a high-voltage and low-temperature drift resistor, which is integrated into the incoming voltage sensor 5 and the outgoing voltage sensor 6;

[0030] The capacitor power supply group extracts the working power from the medium voltage grid and is connected to the incoming or outgoing line side;

[0031] The base plate fastening assembly is connected to the circuit breaker housing and the ground wire;

[0032] Epoxy resin is used to integrally seal the vacuum interrupter 1, transition piece 2, spring contact finger 3, conductive rod 4, current and voltage sensor group, capacitor power supply group, and bottom plate fastening assembly at one time;

[0033] Silicone rubber 9 is coated on the outer layer of epoxy resin to protect against ultraviolet rays.

[0034] The vacuum interrupter 1 is used to interrupt and close current in the medium-voltage power grid. Its input is directly connected to the incoming line of the medium-voltage power grid. The output of the vacuum interrupter 1 is movably connected via a transition piece 2 and a spring contact finger 3, allowing for a certain amount of mechanical movement. A conductive rod 4 is connected to the spring contact finger 3 and extends to the outgoing line of the medium-voltage power grid, forming a current path. A current and voltage sensor assembly is used to monitor power grid operating parameters. The incoming voltage sensor 5 has its high-voltage terminal connected to the incoming line of the medium-voltage power grid and its low-voltage terminal connected to ground, measuring the incoming voltage. The outgoing voltage sensor 6 has its high-voltage terminal connected to the conductive rod 4 and its low-voltage terminal connected to ground, measuring the outgoing voltage. A zero-sequence current sensor 7 and a phase current sensor 8 are sheathed around the conductive rod 4 to measure the current flowing through it. A high-voltage, low-drift resistor, integrated within the voltage sensor, serves as a current-limiting element. Its low-drift characteristic ensures that the voltage measurement accuracy is unaffected by temperature fluctuations. The capacitor power supply group obtains the electrical energy required for operation from the power grid, and its connection position can be selected on the incoming line side or the outgoing line side. The bottom plate fastening assembly is used to fix the entire sealed pole to the circuit breaker housing and provide electrical connection with the circuit breaker housing and the earth to achieve the grounding function. Epoxy resin is used as an insulating packaging material to seal the functional components inside at one time to form a closed and insulating structure. Silicone rubber 9 is coated on the outer surface of the epoxy resin to provide an additional protective layer, especially to prevent ultraviolet rays from aging the epoxy resin.

[0035] Specifically, this sealed pole solves the reliability, accuracy, and lifespan issues that exist in existing technologies when integrating sensors and power supply functions into sealed poles. During medium-voltage grid operation, current flows from the incoming line through the vacuum interrupter 1, transition piece 2, spring contact finger 3, and conductive rod 4 to the outgoing line. The incoming line voltage sensor 5 is connected between the incoming line and the ground to measure the incoming line voltage signal. The outgoing line voltage sensor 6 is connected between the conductive rod 4 and the ground to measure the outgoing line voltage signal. The zero-sequence current sensor 7 and phase current sensor 8 are mounted on the conductive rod 4, sensing the current flowing through the conductive rod 4 and outputting the current signal. The high-voltage, low-temperature drift resistor in the current and voltage sensor group provides stable current limiting for the voltage sensor. Due to its low temperature drift, the voltage measurement accuracy remains stable under different ambient temperatures, resolving the large temperature drift and temperature-dependent accuracy issues of traditional thin-film capacitors. The capacitor power supply group extracts electrical energy from the incoming or outgoing line to provide operating power for sensors, communication modules, or other power-requiring devices within the sealed pole. These internal components, including the vacuum arc chamber 1, the conductive path, the sensor group and the power supply group, are sealed as a whole in one go with epoxy resin. This one-time sealing process avoids the insulation defects and interface problems that may be introduced by traditional secondary potting, significantly improves the overall insulation performance and long-term operation reliability of the sealed pole, and extends the service life of the product. The base plate fastening assembly firmly installs and reliably grounds the sealed pole to ensure safe operation. The outer layer of silicone rubber 9 provides UV protection for the epoxy resin, further enhancing the weather resistance and service life of the product. Therefore, the sealed pole realizes the function of reliably extracting current and voltage signals and working power supply on the medium voltage power grid through integrated design, one-time sealing process and the use of high-precision low-temperature drift resistors and other technical means, thereby improving the reliability, measurement accuracy and service life of the product.

[0036] In some specific embodiments, the sealed pole is designed for a 10kV medium voltage power grid. The vacuum interrupter 1 has a rated voltage of 12kV and a rated current of 630A. The conductive rod 4 is made of copper and has a diameter of 20mm. The incoming voltage sensor 5 and the outgoing voltage sensor 6 adopt the principle of resistor current limiting, and have internally integrated high-voltage and low-temperature drift resistors. The zero-sequence current sensor 7 and the phase current sensor 8 adopt a small power transformer structure and are sleeved on the outer diameter of the conductive rod 4. The capacitor power supply group is connected to the incoming side and outputs a 24VAC AC power supply through capacitor current limiting to the transformer isolation. These components are placed in a mold and then injected with epoxy resin for one-time vacuum casting and curing. The outer layer of the cured epoxy resin is then covered with a layer of silicone rubber 9 with a thickness of 3mm. The base plate fastening assembly is fixed to the circuit breaker housing with M8 bolts and connected to the main grounding bar of the building using a copper wire.

[0037] As an implementation manner of the present invention, the circuit topology of the capacitor power supply group includes a first topology or a second topology.

[0038] Specifically, the capacitor power supply group is used to extract working power from the medium-voltage power grid, solving the problem in the prior art that the circuit topology of the capacitor power supply group is not specifically defined. By providing the first topology or the second topology as an optional circuit structure, the technical solution enables the capacitor power supply group to be flexibly configured according to actual needs. For example, when it is necessary to extract power on the incoming line side, the first topology can be used; when it is necessary to extract power on the outgoing line side, the second topology can be used. This selective configuration capability improves the adaptability of the sealed pole, ensuring that the internal electronic components can stably and reliably obtain the required working power, thereby ensuring the normal operation of the sealed pole.

[0039] In some specific embodiments, two groups of different high-voltage input connection points are provided on the circuit board of the capacitor power supply group. The first group of connection points is designed to be connected to the high-voltage conductor on the incoming line side inside the sealed pole to achieve power extraction of the first topology. The second group of connection points is designed to be connected to the conductive rod 4 on the outgoing line side inside the sealed pole to achieve power extraction of the second topology. During the manufacturing process of the sealed pole, the high-voltage input end of the capacitor power supply group is physically connected to the corresponding connection point according to the predetermined power extraction position requirements. For example, if the design requires power to be taken on the incoming line side, the high-voltage input end is connected to the first group of connection points; if the design requires power to be taken on the outgoing line side, it is connected to the second group of connection points. This design provides a clear implementation path, so that the capacitor power supply group can adopt different circuit topologies according to actual application requirements, thereby improving the versatility and flexibility of the product.

[0040] As an implementation mode of the present invention, the first topology is connected to the incoming line side of the medium voltage power grid, in parallel with the vacuum interrupter 1, and supplies power to external equipment.

[0041] The first topology is connected to the incoming line side of the medium-voltage grid, determining the source of power extraction and ensuring that energy is obtained from the high-voltage side of the grid. The parallel connection with the vacuum interrupter 1 allows the first topology to be directly connected across the incoming line side of the medium-voltage grid, enabling stable energy extraction from the grid voltage, and its operation is not affected by the switching state of the vacuum interrupter 1. This solves the problem of unstable power extraction. At the same time, power is supplied to external devices, clarifying the purpose and distribution of energy extracted by the first topology, ensuring that external devices require power for normal operation, achieving effective utilization and distribution of power, and improving the reliability of the entire sealed pole system.

[0042] Specifically, in the process of extracting working power from the circuit topology of the capacitor power supply group, the specific connection method and power supply object of the first topology are unclear, which may lead to unstable power extraction or inability to effectively provide working power to external devices. This solution adopts a technical solution in which the first topology is connected to the incoming line side of the medium-voltage power grid and is connected in parallel with the vacuum arc chamber 1, while supplying power to external devices. By connecting the first topology to the incoming line side of the medium-voltage power grid and in parallel with the vacuum arc chamber 1, the first topology can directly and stably obtain electrical energy from the high-voltage side of the power grid without being affected by the opening and closing state of the vacuum arc chamber 1. The extracted electrical energy is used to provide working power to external devices. In this way, the problems of unstable power extraction and inability to effectively provide working power to related components are solved, ensuring the normal operation of related functions in the sealed pole.

[0043] As an implementation mode of the present invention, the second topology is connected to the outgoing line side of the conductive rod 4 and is connected in parallel with the outgoing line side voltage sensor 6 .

[0044] Specifically, to address the technical issue of power extraction being limited to the incoming line, thus failing to meet the need for power extraction from the outgoing line, this solution provides a second circuit topology for a capacitor power supply group. This second topology is connected to the outgoing line side of the conductive rod 4 inside the encapsulated pole and connected in parallel with the outgoing line voltage sensor 6. By placing the connection point of the capacitor power supply group on the outgoing line side of the conductive rod 4, this solution enables the function of extracting operating power from the medium-voltage grid on the outgoing line side. This overcomes the limitation of extracting power only from the incoming line side, provides the ability to obtain power from the outgoing line side, and increases the flexibility and applicability of power extraction. The second topology represents a specific circuit structure for implementing the capacitor power extraction function. The connection to the outgoing line side of the conductive rod 4 clarifies the physical and electrical connection point for power extraction, namely, on the outgoing line conductor. The parallel connection with the outgoing line voltage sensor 6 further defines the connection relationship, indicating that the power extraction circuit and the outgoing line voltage sensor 6 share or are located at the same connection point, and the outgoing line voltage signal is obtained in parallel for energy conversion. These technical features work together to enable the encapsulated pole to obtain the required operating power from the outgoing line grid.

[0045] As an embodiment of the present invention, the circuit connection of the current and voltage sensor group includes:

[0046] The zero-sequence current sensor 7 and the phase current sensor 8 are connected in parallel with the current sensor sampling resistor to convert the current signal into a voltage signal;

[0047] The current and voltage sensor circuit board integrates a signal conditioning circuit, which is connected to the sampling resistor and the incoming voltage sensor 5 and the outgoing voltage sensor 6.

[0048] Specifically, the above technical solution is adopted to address the issues of converting the raw signals output by the current and voltage sensor group into usable electrical signals and the accuracy and stability of signal processing. The current signals sensed by the zero-sequence current sensor 7 and the phase current sensor 8 are transmitted through the sampling resistors connected in parallel with them to generate a voltage signal proportional to the current according to Ohm's law. This voltage signal, as well as the voltage signals directly output by the incoming voltage sensor 5 and the outgoing voltage sensor 6, are sent to the signal conditioning circuit integrated on the current and voltage sensor circuit board. The signal conditioning circuit preprocesses these raw voltage signals, for example, by increasing the signal amplitude through an amplification circuit, removing high-frequency noise through a filtering circuit, achieving electrical isolation through an isolation circuit, or adjusting the signal voltage range through a level conversion circuit. The conditioned signal has a higher signal-to-noise ratio and stability, and its voltage range meets the input requirements of subsequent digital processing units such as analog-to-digital converters. As a result, the raw signals output by the sensors are effectively converted into usable electrical signals, ensuring signal accuracy and stability, and simplifying external processing requirements.

[0049] In some specific embodiments, the output ends of the zero-sequence current sensor 7 and the phase current sensor 8 are connected in parallel with a precision sampling resistor. For example, the sampling resistor can be a metal film resistor with a resistance of 10 ohms. When the current sensor outputs a proportional current signal, a corresponding voltage drop will be generated on the resistor. A plurality of electronic components are integrated on the current and voltage sensor circuit board to form a signal conditioning circuit. The output signals of the incoming voltage sensor 5 and the outgoing voltage sensor 6 are respectively sent to their respective signal conditioning channels, which may include a buffer, an attenuator or an amplifier, and a low-pass filter. The conditioned signal is output to a connector on the circuit board, such as an aviation socket, for connection to an external control or monitoring system.

[0050] As an embodiment of the present invention, the current and voltage sensor group further includes a current and voltage sensor fixing member 10, which is used to fix the sensor assembly.

[0051] Specifically, in the process of extracting current signals and voltage signals by the current and voltage sensor group, the sensor component may have problems with uncertain position or movement. By setting a current and voltage sensor fixing part 10, the fixing part is used to fix the sensor component. The current and voltage sensor fixing part 10 fixes the zero-sequence current sensor 7, the phase current sensor 8, the sampling resistor, and the circuit board of the integrated signal conditioning circuit together to form a stable structure. This structure maintains a predetermined position during the overall epoxy resin sealing process to prevent the components from being displaced or tilted. After the sealed pole is put into operation, the fixing part continues to provide support to prevent the sensor component from moving due to vibration or temperature changes. In this way, the accurate extraction of current and voltage signals is ensured and the function of the sensor group is maintained.

[0052] As an implementation mode of the present invention, the current and voltage sensor group outputs the detection signal through the current and voltage sensor aviation socket.

[0053] The current and voltage sensor group generates a detection signal. The current and voltage sensor aviation socket provides an interface. The current and voltage sensor group outputs the detection signal through the aviation socket. The aviation socket establishes a connection point for connecting the current and voltage sensor group to an external system, enabling the external system to receive and utilize the detection signal.

[0054] Specifically, the current and voltage sensor assembly detects current and voltage signals. Outputting these detected signals for use by an external system requires an interface. By providing an aviation socket for the current and voltage sensors, which serves as a connection point between the current and voltage sensor assembly and the external system, the current and voltage sensor assembly transmits the detected signals to the external system via the aviation socket. This allows the external system to receive and process these detection signals, resolving the signal output interface issue.

[0055] As an implementation mode of the present invention, the capacitor power supply group outputs power through an aviation socket, and the power supply position can be selected from the incoming line side or the outgoing line side.

[0056] Specifically, the capacitor-powered power pack draws operating power from the medium-voltage grid to power external devices. The output of the capacitor-powered power pack is connected to an aviation receptacle. The aviation receptacle is located on the exterior of the sealed pole and provides a power output interface. Outputting power through the aviation receptacle solves the technical challenge of conveniently and reliably supplying extracted power to external devices. The aviation receptacle offers stable connections, a high level of protection, and easy plugging and unplugging, improving the reliability and usability of power output. The power draw location can be selected from either the incoming or outgoing line, addressing the technical challenge of power draw point flexibility. This means that during the design and installation of the sealed pole, power can be drawn from either the incoming or outgoing line, depending on the actual grid connection, load distribution, or system requirements. This increases system adaptability and installation convenience. Outputting power through the aviation receptacle ensures standardized and reliable power output, while the selectable power draw location provides system configuration flexibility, enhancing the practicality of the sealed pole in various application scenarios.

[0057] As an embodiment of the present invention, the 9 layers of silicone rubber have a thickness of 1-5 mm and have an IP68 protection grade.

[0058] The silicone rubber 9, with a thickness of 1-5mm, provides a physical barrier to block UV rays from the epoxy resin, slowing its aging. It also has an IP68 rating, meaning it completely blocks dust ingress and can withstand prolonged immersion in water at a certain pressure.

[0059] Specifically, the silicone rubber 9 is coated on the outer layer of epoxy resin to protect against ultraviolet rays. However, in this process, the protective ability of the silicone rubber 9 may not be sufficient to cope with long-term complex environmental factors, affecting the long-term stable operation and service life of the solid-sealed pole. The above problem is solved by limiting the layer thickness and protection level of the silicone rubber 9. The combination of the layer thickness control of the silicone rubber 9 and the IP68 protection level enhances the weather resistance and environmental adaptability of the solid-sealed pole, and improves the reliability and service life of the solid-sealed pole. This protection level ensures that the external insulation layer of the solid-sealed pole is protected from erosion by solid particles and moisture in the environment, maintaining the stability of the insulation performance.

[0060] In some embodiments, the thickness of the silicone rubber 9 layer is set to 3 mm. The silicone rubber 9 material and coating process are selected to ensure that the external insulation layer of the sealed pole meets the IP68 protection level. For example, the silicone rubber 9 material can be evenly coated on the outer surface of the epoxy resin by molding to form a protective layer of uniform thickness. As a result, the sealed pole can effectively resist ultraviolet radiation, dust intrusion, and water immersion, extending its service life.

[0061] As an embodiment of the present invention, the base plate fastening assembly is also a grounding terminal, which is connected to the circuit breaker housing and the ground wire through a copper wire.

[0062] The baseplate fastening assembly grounding terminal provides a connection point. A copper conductor acts as a conductive medium, connecting the grounding terminal to the circuit breaker housing and the building's main grounding bar. The grounding terminal provides a standardized connection interface. The copper conductor provides a conductive path. Connecting to the circuit breaker housing and the building's main grounding bar connects the baseplate fastening assembly of the encapsulated pole to the equipment's grounding system and the building's main grounding system.

[0063] Specifically, the baseplate fastening assembly is used to connect to the circuit breaker housing and the earth. However, in this process, the specific structure and connection medium of the baseplate fastening assembly to achieve connection with the circuit breaker housing and the main grounding bar of the building are not defined. The baseplate fastening assembly grounding terminal provides a connection point. The grounding terminal is connected through a copper wire, which serves as a conductive medium to connect the grounding terminal to the circuit breaker housing and the main grounding bar of the building. The provision of a grounding terminal provides a standardized connection interface. The use of copper wire provides a conductive path. Connected to the circuit breaker housing and the main grounding bar of the building, the baseplate fastening assembly of the sealed pole is connected to the grounding system of the equipment and the main grounding system of the building. These technical features work together to clarify the grounding connection method of the baseplate fastening assembly and provide a specific structure and medium for achieving grounding, thereby solving the problem of the specific structure and connection medium for the baseplate fastening assembly to achieve connection with the circuit breaker housing and the main grounding bar of the building being undefined, providing a clear grounding path, and improving the safety of equipment operation.

[0064] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and description only describe the principles of the present invention. Various changes and improvements are possible without departing from the spirit and scope of the present invention. Such changes and improvements are within the scope of the present invention as claimed, and the scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealed pole, used in a medium voltage power grid, to extract current signals, voltage signals and power supply from the medium voltage power grid, characterized in that: Also includes: A vacuum interrupter (1), wherein the input end of the vacuum interrupter (1) is connected to the incoming line side of the medium voltage power grid; The transition piece (2) and the spring contact finger (3) are movably connected to the output end of the vacuum interrupter (1); A conductive rod (4) connected to the spring contact finger (3) and extending to the outlet side of the medium voltage power grid; The current and voltage sensor group comprises: an incoming line voltage sensor (5), the high-voltage end of which is connected to the incoming line side of the medium-voltage power grid, and the low-voltage end is grounded; an outgoing line voltage sensor (6), the high-voltage end of which is connected to the conductive rod (4), and the low-voltage end is grounded; a zero-sequence current sensor (7) and a phase current sensor (8), which are sleeved on the conductive rod (4); and a high-voltage, low-temperature drift ceramic capacitor, which is integrated into the incoming line voltage sensor (5) and the outgoing line voltage sensor (6); The capacitor power supply group extracts the working power from the medium voltage grid and is connected to the incoming or outgoing line side; The base plate fastening assembly is connected to the circuit breaker housing and the ground wire; Epoxy resin is used to integrally seal the vacuum interrupter (1), the transition piece (2), the spring contact finger (3), the conductive rod (4), the current and voltage sensor group, the capacitor power supply group, and the base plate fastening assembly at one time; Silicone rubber (9) is coated on the outer layer of epoxy resin to protect against ultraviolet rays.

2. The sealed pole according to claim 1, characterized in that: The circuit topology of the capacitor-powered power supply group includes a first topology or a second topology.

3. The sealed pole according to claim 2, characterized in that: The first topology is connected to the incoming line side of the medium voltage power grid and is connected in parallel with the vacuum interrupter (1), and simultaneously supplies power to the vacuum interrupter (1), the capacitor power supply group, and the incoming line voltage sensor (5).

4. The sealed pole according to claim 3, characterized in that: The second topology is connected to the outgoing line side of the conductive rod (4) and is connected in parallel with the outgoing line side voltage sensor (6).

5. The sealed pole according to claim 1, characterized in that: The circuit connection of the current and voltage sensor group includes: The zero-sequence current sensor (7) and the phase current sensor (8) are connected in parallel with the current sensor sampling resistor to convert the current signal into a voltage signal; The current and voltage sensor circuit board integrates a signal conditioning circuit, and is connected to a sampling resistor and an incoming line voltage sensor (5) and an outgoing line voltage sensor (6).

6. The sealed pole according to claim 5, characterized in that: The current and voltage sensor group further comprises a current and voltage sensor fixing member (10), and the current and voltage sensor fixing member (10) is used to fix the sensor assembly.

7. The sealed pole according to claim 6, characterized in that: The current and voltage sensor group outputs detection signals through the current and voltage sensor aviation socket.

8. The sealed pole according to claim 1, characterized in that: The capacitor power supply group outputs power through an aviation socket, and the power supply position can be selected from the incoming line side or the outgoing line side.

9. The sealed pole according to claim 1, characterized in that: The thickness of the silicone rubber (9) layer is 1-5 mm and has an IP68 protection grade.

10. The sealed pole according to claim 1, characterized in that: The bottom plate fastening assembly is also a grounding terminal, which is connected to the circuit breaker housing and the ground wire through a copper wire.

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