Self-energy-taking type all-insulation built-in isolation solid-sealed polar pole

Abstract

The invention discloses a self-energy-taking type all-insulation built-in isolation solid-sealed polar pole which comprises an upper wire inlet conducting rod, a vacuum arc-extinguishing chamber and a current transformer which are fixedly sealed in the solid-sealed polar pole, and further comprises an electrified display electricity taking ring, a lower wire outlet conducting rod and an electricity taking capacitor, the built-in isolation solid-sealed polar pole forms a conductive electric connection path; an electrified display electricity taking ring is fixed at the position, where the current transformer is poured, in the solid-sealed polar pole through an insulating bracket; and the electricity taking capacitor is connected from the lower wire outlet conducting rod through a wire and outputs alternating current voltage. According to the invention, visual observation of the position state of the direct-acting isolation knife is realized, and the problem that the internal condition of an isolation fracture cannot be directly observed by conventional equipment is solved. The design of the live-line display electricity taking ring improves the accuracy and safety of live-line detection. In addition, through cooperative work of the power taking capacitor, the transformer, the rectifier bridge and other elements, stable direct-current working voltage is provided for a follow-up circuit, and stable operation of the whole system is ensured.

Description

Technical Field

[0001] This invention relates to the field of built-in isolation and solid-sealed pole technology, specifically to a self-powered, fully insulated built-in isolation and solid-sealed pole. Background Technology

[0002] Built-in isolated solid-sealed poles are key components of medium-voltage switchgear. They utilize an epoxy resin vacuum casting process to solidify the vacuum interrupter, conductive circuit, and insulation support structure into a single unit, offering advantages such as high mechanical strength, strong environmental resistance, and stable insulation performance. Currently, while solid-sealed poles achieve equipment miniaturization through modular design, their functions are mainly focused on current switching and insulation isolation, lacking status visualization and live monitoring capabilities.

[0003] Traditional built-in isolated and solid-sealed poles have the following obvious drawbacks: First, they lack status monitoring methods. The poles are completely sealed with opaque epoxy resin, making it impossible for maintenance personnel to directly observe the wear of the contacts in the internal vacuum interrupter, arc generation, and degradation of the insulating medium. This makes fault prediction difficult, and maintenance relies on power outages for disassembly and inspection, affecting the continuity of power supply. Second, the energized state is not visible. There is no integrated energization display device, making it difficult to intuitively determine whether the equipment is energized during operation. In complex operating conditions, misjudgments can easily lead to operational risks, endangering the safety of maintenance personnel. Third, the level of intelligence is insufficient. Status monitoring relies heavily on external sensors, which suffers from complex installation, signal interference, and low reliability, failing to meet the requirements of smart grids for real-time equipment status perception. Summary of the Invention

[0004] This invention proposes a self-powered, fully insulated, built-in isolation solid-sealed pole, specifically a built-in isolation solid-sealed pole with an observation window and a live display function. Through the integrated observation window design, a high-strength transparent observation window is embedded at a specific position on the solid-sealed pole body, seamlessly bonded with an optically transparent medium and epoxy resin, to achieve visual monitoring of the internal isolation contact status while ensuring overall insulation performance; the built-in live display module provides a visual display through light signals under the overall operating conditions of the circuit breaker, helping maintenance personnel to quickly identify the equipment potential.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A self-powered, fully insulated, internally isolated, and solid-sealed pole post includes an upper incoming conductive rod, a vacuum interrupter, and a current transformer, all of which are solid-sealed within the pole post. It also includes a live display power-taking ring, a lower outgoing conductive rod, and a power-taking capacitor. Install spring contact fingers into the upper and lower isolation knife holders; then install the upper and lower isolation knife holders and the flexible connection into the solid-sealed pole in sequence and connect the flexible connection and the moving end of the vacuum interrupter with the circuit breaker insulating pull rod; finally, install the direct-acting isolation knife and the isolation insulating pull rod into the isolation chamber, so that the built-in isolation solid-sealed pole forms a conductive electrical connection path. At the location where the current transformer is cast inside the solid-sealed pole, a live-in display ring is fixed by an insulating bracket. The capacitor draws power from the lower conductive rod via a wire and outputs AC voltage.

[0006] Furthermore, an installation hole is provided at the designated position of the solid-sealed electrode post, which is located at the contact point between the direct-acting isolation knife and the upper isolation knife seat inside the solid-sealed electrode post.

[0007] Furthermore, a transparent observation window made of high-strength transparent tempered glass is embedded in the mounting hole.

[0008] Furthermore, the transparent observation window adopts a stepped structure design on all four sides.

[0009] Furthermore, the part of the transparent observation window that contacts the solidified electrode post has been meticulously polished, and the solidification technology is used to cast the solidified electrode post into a single piece.

[0010] Furthermore, the transparent observation window is made of 12mm thick transparent tempered glass with a light transmittance of 85% to 87%, a dielectric strength of ≥25kV / mm, a window thickness of 12mm, a minimum dielectric strength of 300kV, and a bending strength of ≥120MPa.

[0011] Furthermore, after the live display power-taking ring is sealed with epoxy resin insulating material, it forms a concentric circle structure with the lower outgoing conductive rod, thus constituting the high-voltage arm capacitor C power-taking ring.

[0012] Furthermore, the live display power-taking ring adopts a ring electrode structure.

[0013] Furthermore, the live display power take-off ring is made of annular brass mesh or semi-conductive paper and fixed inside the current transformer with insulating material.

[0014] Furthermore, a high-voltage capacitor C1 is formed inside the current transformer between the lower outgoing conductive rod and the energized display tapping ring, and a low-voltage capacitor C2 is formed between the energized tapping ring and the current transformer, so that the two capacitors C1 and C2 and the outgoing conductive rod (10) form a voltage divider; according to the capacitor voltage divider formula: the voltage UL of the low-voltage capacitor C2 is: .

[0015] As can be seen from the above technical solution, the self-powered, fully insulated, built-in isolation solid-sealed pole of the present invention solves the shortcomings of existing equipment in terms of operating status monitoring, live status sensing, and power supply to subsequent circuits. By setting a transparent observation window on the solid-sealed pole, the position status of the direct-acting isolation blade is directly observed, solving the problem that previous equipment could not directly observe the internal condition of the isolation break. At the same time, the design of the live display power-taking ring enables the equipment to sense the live status in real time based on the principle of capacitive voltage division, improving the accuracy and safety of live detection. In addition, the present invention also provides a stable DC operating voltage for subsequent circuits through the coordinated work of components such as the power-taking capacitor, transformer, and rectifier bridge, ensuring the stable operation of the entire system.

[0016] Specifically, the present invention has the following beneficial effects: 1. Visual monitoring: Through the transparent observation window, operators can intuitively and clearly observe the position and status of the direct-acting isolating knife, and understand the operation of the equipment in a timely manner, which improves the convenience and accuracy of equipment operation status monitoring.

[0017] 2. Reliable live detection: The live display power tap ring is based on the principle of capacitive voltage division, which can sense the live state in real time and indirectly reflect the live state of the live body by measuring the voltage across the two ends of the power tap ring, thus improving the accuracy and reliability of live detection.

[0018] 3. Stable power supply system: The coordinated operation of components such as the power-taking capacitor, transformer and rectifier bridge provides a stable DC operating voltage for the subsequent circuits, ensuring the stable operation and accurate monitoring of the entire equipment.

[0019] 4. Excellent sealing performance: The transparent observation window and the solid-sealed electrode adopt a stepped structure design and are integrally molded by grinding and casting, which ensures a tight bond between the resin and the glass, ensuring the sealing performance of the observation window, preventing external impurities and gases from entering the solid-sealed electrode, and extending the service life of the equipment.

[0020] 5. Compact structure and high integration: This invention integrates multiple functional components inside the solid-sealed pole, making the entire device structure more compact and with higher integration, which is conducive to the miniaturization and modular design of the device. Attached Figure Description

[0021] Figure 1 This is a front view schematic diagram of the built-in isolation and solid-sealed pole in an embodiment of the present invention; Figure 2 This is a side view schematic diagram of the built-in isolation and solid-sealed pole in an embodiment of the present invention; Figure 3 This is a schematic diagram of the AA cross-section (closed state) of an embodiment of the present invention; Figure 4This is a schematic diagram of the AA cross-section (opening state) of an embodiment of the present invention; Figure 5 This is an enlarged schematic diagram of part C in embodiment C of the present invention; Figure 6 This is a schematic cross-sectional view of BB in an embodiment of the present invention; Figure 7 This is an enlarged schematic diagram of part D in embodiment D of the present invention; Figure 8 This is a schematic diagram of the live display power tapping ring according to an embodiment of the present invention; Figure 9 This is a schematic diagram illustrating the self-powered principle of an embodiment of the present invention; Figure 10 This is a schematic diagram of the shape of the observation window according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the charged display structure according to an embodiment of the present invention; Figure 12 This is a detailed diagram illustrating the self-powering principle of an embodiment of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0023] The self-powered, fully insulated, built-in isolation solid-sealed pole described in this embodiment includes an upper inlet conductive rod 2, a vacuum interrupter 3, a flexible connection 4, a circuit breaker insulating pull rod 5, an upper isolation knife seat 6, a spring contact finger 7, a current transformer 8, a live display power-taking ring 9, a lower outlet conductive rod 10, a direct-acting isolation knife 11, a lower isolation knife seat 12, an isolation insulating pull rod 13, a transparent observation window 14, and a power-taking capacitor 15.

[0024] The solid-sealed pole post 1 contains an upper inlet conductive rod 2, a vacuum interrupter 3, a current transformer 8, a live indicator power take-up ring 9, a lower outlet conductive rod 10, and a power take-up capacitor 15. Spring contact fingers 7 are installed inside the upper isolation knife holder 6 and the lower isolation knife holder 12. The upper isolation knife holder 6, the lower isolation knife holder 12, and the flexible connection 4 are then installed in sequence inside the solid-sealed pole post 1, and the flexible connection 4 and the moving end of the vacuum interrupter 3 are connected by the circuit breaker insulating pull rod 5. Finally, the direct-acting isolation knife 11 and the isolation insulating pull rod 13 are installed into the isolation chamber, so that the built-in solid-sealed pole post forms a conductive electrical connection path.

[0025] The following combination Figures 1-7 Detailed explanation: This embodiment provides a self-powered, fully insulated, internally isolated, solid-sealed pole with a visible break and a live indicator function; including: A mounting hole is provided at a specific location on the solid-sealed pole 1, at the contact point between the direct-acting isolator 11 and the upper isolator seat 6 inside the solid-sealed pole 1. A transparent observation window 14 made of high-strength transparent tempered glass is carefully embedded in the mounting hole. The setting of the transparent observation window 14 allows the operator to intuitively and clearly observe the position status of the direct-acting isolator 11, opening up a visual window for monitoring the equipment operation status, and effectively improving the convenience and accuracy of equipment operation monitoring.

[0026] When the direct-acting isolating knife 11 comes into contact with or moves away from the isolating upper knife holder 6 during its up-and-down movement, the staff can observe the internal condition of the isolation break in real time through the transparent observation window 14, including whether the isolating knife is in the closed or open state, so as to grasp the operating status of the equipment in a timely manner and provide strong support for the maintenance and management of the equipment.

[0027] To ensure a good seal between the transparent observation window 14 and the solidified electrode post 1, the transparent observation window 14 adopts a stepped structure design on all four sides. Simultaneously, the contact area between the transparent observation window 14 and the solidified electrode post is meticulously polished, and advanced sealing technology is used to cast it integrally with the solidified electrode post 1. This process effectively ensures a tight bond between the resin and the glass, guaranteeing reliable sealing performance at the observation window, preventing external impurities and gases from entering the solidified electrode post, and ensuring the normal operation of the equipment.

[0028] Furthermore, such as Figure 10 As shown, in this embodiment, the transparent observation window is made of 12mm thick transparent tempered glass: its light transmittance is 85%~87%, dielectric strength is ≥25kV / mm, the observation window thickness is 12mm, and its minimum dielectric strength is 300kV, which fully meets the requirements of 12kV product power frequency withstand voltage (42kV / 48kV) and lightning impulse withstand voltage (75kV / 85kV) test; the most critical bending strength is ≥120MPa, which fully meets the requirements of transparent observation window for outdoor use; The transparent observation window has an elliptical structure with stepped design on all four sides. The exposed part is a 25×45 oval shape. The 2.5mm steps on all four sides and the resin contact surface are roughened to ensure the bonding between the resin and the glass, thereby ensuring a good seal at the observation window.

[0029] like Figure 8 , Figure 9 and Figure 11As shown, a live display charging ring 9 is cleverly fixed to the location where the current transformer 8 is cast inside the solidified pole 1 via an insulating bracket. This structural design is based on the principle of capacitive voltage division and can sense the energized state of the equipment in real time. After the live display charging ring 9 is sealed with epoxy resin insulating material, it forms a concentric circle structure with the lower lead conductor rod 10, constituting a high-voltage arm capacitor C charging ring. When an electric field exists around the lower lead conductor rod 10, a charge will be induced on the live display charging ring 9. According to the capacitive voltage division formula, V charging ring = V charged body × (C charging ring / (C total)), where V charging ring represents the voltage across the charging ring, V charged body is the voltage of the charged body, C charging ring is the capacitance between the charging ring and the charged body, and C total covers the total capacitance of the entire circuit, including the charging ring capacitance and the input capacitance of subsequent circuits. When the electric field strength of the lower lead conductor rod 10 increases, the amount of charge induced by the live display charging ring 9 increases accordingly, and the voltage across its ends also increases. By accurately measuring the voltage across the live display ring 9, the live state of the live body can be indirectly and accurately reflected, providing an important basis for the live detection of equipment.

[0030] The live display power-taking ring 9 typically employs a ring electrode structure. When an electric field is generated around the downstream conductive rod 10, the electric field lines pass through the power-taking ring, inducing a charge on the surface of the live display power-taking ring 9. These induced charges then create a potential difference between the live display power-taking ring 9 and subsequent circuitry, providing a basis for subsequent signal processing and live state determination.

[0031] like Figure 11 As shown, in one embodiment, the live display power-taking ring is fixed inside the current transformer using an annular brass mesh or semi-conductive paper through insulating material; thus, a high-voltage capacitor C1 is formed between the lower lead-out conductive rod and the live display power-taking ring, and a low-voltage capacitor C2 is formed between the live display power-taking ring and the current transformer, forming a voltage divider between the two capacitors C1 and C2 and the lead-out conductive rod; according to the capacitor voltage divider formula, the voltage UL of the low-voltage capacitor C2 is:

[0032] Because UL is expected to be a very low safety voltage, it is usually designed as C1. C2 (i.e., the capacitance of the high-voltage arm capacitor C1 is much smaller than the capacitance of the low-voltage arm capacitor C2). According to the formula, most of the voltage will drop across C1, which has a larger capacitive reactance, while only a very small voltage will be distributed across C2. UL can directly drive and light a neon lamp or, after rectification, light an LED lamp to achieve a live indicator function.

[0033] Capacitive voltage divider principle, capacitor calculation formula: , ; : Absolute dielectric constant (F / M) of the insulating medium; ln: Natural logarithm.

[0034] In addition, the built-in isolation and solid-sealed terminal 1 also contains a power-taking capacitor 15, whose main function is to utilize the external AC power supply (V) through capacitor voltage division, current limiting, rectification, and filtering to stably provide DC operating voltage (V+ and V-) for subsequent circuits. The specific implementation is as follows: Capacitor 15 is connected to the lower output conductive rod 10 via a wire and outputs AC voltage V. This AC voltage V is then divided by capacitors C1 and C2. By appropriately selecting the capacitance values ​​of C1 and C2, the input AC voltage V can be divided into two parts: one part provides the necessary voltage to the primary winding of the transformer, and the other part forms a stable reference potential through grounding (PE), creating favorable potential conditions for the normal operation of subsequent circuits and ensuring the stable operation of the entire system.

[0035] The voltage across the transformer windings is obtained by voltage division using capacitor C2. Driven by alternating current, the transformer windings generate an alternating magnetic field. According to the principle of electromagnetic induction, the transformer windings can induce a corresponding alternating voltage. Subsequently, the rectifier bridge efficiently converts the alternating voltage output from the transformer secondary windings into DC operating voltages (V+ and V-), providing stable power support for the normal operation of subsequent circuits and ensuring reliable operation and accurate monitoring of the entire device.

[0036] like Figure 12 As shown, the self-powering principle of this invention is as follows: Utilizing a capacitor voltage divider circuit design, the input voltage Un is proportionally distributed to the output terminal. The internal TVS is a transient voltage suppressor that absorbs voltage spikes using its module group (when an overvoltage occurs at the input terminal Un (such as a lightning strike or switch surge), the TVS module group quickly conducts, clamping the overvoltage to a safe value). This protects the downstream circuitry, preventing high voltage from damaging low-voltage components C' and C''. The internal rectifier bridge utilizes the unidirectional conduction characteristic of diodes to convert AC to DC. The internal RC structure C'' and R1 absorbs overvoltage, suppresses voltage change rate, dissipates energy, dampens oscillations, and protects the circuit. Through these modules, the device provides a safe and stable power supply.

[0037] formula for partial pressure ratio:

[0038] The low-voltage value UL can be calculated using the voltage division ratio K. .

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-powered fully insulated built-in isolated solid-sealed pole, a solid-sealed pole (1) is internally solid-sealed with an upper incoming line conducting rod (2), a vacuum interrupter (3), and a current transformer (8), characterized in that, It also includes the charged display power ring (9), the lower outgoing line conductive rod (10), and the power capacitor (15). The spring contact finger (7) is installed in the isolation upper knife seat (6) and the isolation lower knife seat (12); then the isolation upper knife seat (6), the isolation lower knife seat (12), and the flexible connection (4) are sequentially installed in the solid-sealed pole (1) and connected with the vacuum arc-extinguishing chamber (3) moving end by the circuit breaker insulation pull rod (5); finally, the direct-acting isolation knife (11) and the isolation insulation pull rod (13) are installed in the isolation chamber, so that the built-in isolation solid-sealed pole forms a conductive electrical connection path. The charged display power ring (9) is fixed by an insulating support at the position of the current transformer (8) in the solid-sealed pole (1). The power capacitor (15) is connected from the lower outgoing line conductive rod (10) by a wire and outputs an alternating voltage.

2. The self-capacitance fully insulated isolated solid-sealed pole as claimed in claim 1, wherein: A mounting hole is provided at a set position of the solid-sealed pole (1), which is at the contact position of the direct-acting isolation knife (11) and the isolation upper knife seat (6) inside the solid-sealed pole (1).

3. The self-capacitance fully insulated isolated solid-sealed pole as claimed in claim 2, wherein: The transparent observation window (14) made of high-strength transparent tempered glass is embedded in the mounting hole.

4. The self-capacitance fully insulated isolated solid-sealed pole as claimed in claim 3, wherein: The transparent observation window (14) is designed with a stepped structure on four sides.

5. The self-capacitance fully insulated isolated solid-sealed pole as claimed in claim 4, wherein: The contact part of the transparent observation window (14) and the solid-sealed pole is finely polished, and the integral molding is poured with the solid-sealed pole (1) by using the solid sealing technology.

6. The self-capacitance fully insulated isolated solid-sealed pole as claimed in claim 3, wherein: The transparent observation window (14) is made of 12mm thick transparent tempered glass, with a light transmittance of 85%-87%, a dielectric strength of ≥25kV / mm, an observation window thickness of 12mm, a minimum dielectric strength of 300kV, and a bending strength of ≥120MPa.

7. The self-capacitance fully insulated isolated solid-sealed pole as claimed in claim 1, wherein: After the charged display power ring (9) is solidified by an epoxy resin insulating material, it forms a concentric circle structure with the lower outgoing line conductive rod (10) to constitute a high-voltage arm capacitor C power ring.

8. The self-capacitance fully insulated isolated solid-sealed pole as claimed in claim 7, characterized in that: The charged display power ring (9) adopts a ring electrode structure.

9. The self-capacitance fully insulated isolated solid-sealed pole as claimed in claim 7, characterized in that: The charged display power ring (9) is fixed inside the current transformer (8) by an insulating material, which is a ring-shaped brass mesh or a semi-conductive paper.

10. The self-capacitance fully insulated isolated solid-sealed pole according to claim 9, characterized in that: A high-voltage capacitor C1 is formed between the lower outgoing line conductive rod (10) and the charged display power ring (9) inside the current transformer (8), and a low-voltage capacitor C2 is formed between the charged power ring and the current transformer, so that the two capacitors C1 and C2 and the outgoing line conductive rod (10) constitute a voltage divider; according to the capacitor voltage division formula, the voltage UL of the low-voltage capacitor C2 is: 。

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