A line wave distance measuring type primary and secondary fusion complete set pole-mounted circuit breaker

Abstract

The application relates to a traveling wave distance measurement type primary and secondary fusion complete set pole-mounted circuit breaker, and relates to the technical field of power devices.The circuit breaker comprises a cabinet and a plurality of solid-sealed poles arranged at intervals on the cabinet, the solid-sealed pole comprises an insulating shell and a load end conducting rod transversely arranged, an installation cavity is arranged around the load end conducting rod in the insulating shell, a traveling wave combined current sensor and a zero sequence current sensor are embedded in the installation cavity, a metal shielding heat exchange assembly is arranged in the installation cavity and is separated to form a first cavity, a second cavity and a heat dissipation cavity, the traveling wave combined current sensor is located in the first cavity, the zero sequence current sensor is located in the second cavity, an electromagnetic partition is formed between the two, a heat conduction path is formed between the first cavity, the second cavity and the heat dissipation cavity and is matched with heat exchange with the outside, the metal shielding heat exchange assembly weakens the coupling trend of signals of different frequency bands, heat is diffused outward through partitioned heat exchange, and the sensor detection stability is maintained and the thermal environmental conditions are improved.

Description

Technical Field

[0001] This application relates to the field of power device technology, and in particular to a traveling wave ranging type integrated primary and secondary pole-mounted circuit breaker. Background Technology

[0002] Currently, circuit breakers are control devices used in power systems to achieve line protection and fault isolation, and are typical electrical components. A traditional integrated primary and secondary pole-mounted circuit breaker is defined as follows: the primary device is responsible for current switching, and the secondary device is responsible for monitoring and control; the two are connected via an external cable.

[0003] In the integrated primary and secondary pole-mounted circuit breakers of related technologies, traveling wave combined current sensors are mainly used to capture high-frequency (kHz to MHz level) and weak fault transient current traveling wave signals, while zero-sequence current sensors are mainly used to measure power frequency (50Hz) zero-sequence current. Furthermore, in actual manufacturing, the traveling wave combined current sensor and the zero-sequence current sensor are typically fitted adjacent to each other on the outer periphery of the load-side conductive rod.

[0004] Through research, the inventors discovered that when the traveling wave combined current sensor and the zero-sequence current sensor are nested adjacently on the outer periphery of the load-end conductive rod, signal interference often occurs between the two. At the same time, the traveling wave combined current sensor and the zero-sequence current sensor also often overheat, which leads to a reduction in the service life of the primary and secondary integrated pole-mounted circuit breaker. Summary of the Invention

[0005] This application provides a traveling wave ranging type integrated primary and secondary pole-mounted circuit breaker to at least partially solve the above-mentioned technical problems.

[0006] To achieve the above objectives, according to a first aspect of this application, a traveling wave ranging type integrated primary and secondary pole-mounted circuit breaker is provided, comprising: Chassis; A plurality of solid-sealed poles are arranged at intervals on the chassis. Each solid-sealed pole includes an insulating shell and a load-end conductive rod. The insulating shell is installed on the chassis, and the load-end conductive rod is inserted laterally into the insulating shell and extends out from one side of the insulating shell. A traveling wave combined current sensor has a mounting cavity provided inside the insulating housing on the outer periphery of the conductive rod at the load end, and the traveling wave combined current sensor is embedded in the mounting cavity; A zero-sequence current sensor is embedded in the mounting cavity and arranged adjacent to the traveling wave combined current sensor along the axial direction of the load-end conductive rod; and A metal-shielded heat exchange assembly is installed in the mounting cavity, which divides the mounting cavity into a first chamber, a second chamber, and a heat dissipation chamber. The traveling wave combined current sensor is located in the first chamber, and the zero-sequence current sensor is located in the second chamber. The first chamber and the second chamber are electromagnetically isolated. The heat dissipation chamber is in heat exchange cooperation with the outside world, the first chamber, and the second chamber.

[0007] Using the above technical solution, the traveling wave combined current sensor is located in the first chamber, and the zero-sequence current sensor is located in the second chamber. The first and second chambers are electromagnetically isolated by a metal-shielded heat exchange component. Therefore, signal interference between the traveling wave combined current sensor and the zero-sequence current sensor is unlikely, allowing both to maintain a certain level of operational stability. Simultaneously, during continuous operation, when the traveling wave combined current sensor and the zero-sequence current sensor generate heat, the heat generated can be transferred from the first and second chambers to the heat dissipation chamber through the heat exchange performance of the metal-shielded heat exchange component, and then transferred to the outside environment. At the same time, the first and second chambers maintain isolation from the outside environment, preventing electromagnetic leakage. This effectively ensures the operation of both the traveling wave combined current sensor and the zero-sequence current sensor while also dissipating heat, thereby increasing the service life of the integrated primary and secondary pole-mounted circuit breaker.

[0008] Optionally, the solidified pole further includes an insulating support casting body, which is disposed inside the insulating shell and located on the outer periphery of the load-end conductive rod, and the mounting cavity is formed inside the insulating support casting body.

[0009] By adopting the above technical solution, the setting of the insulating support casting body can achieve insulation between the traveling wave combined current sensor and the zero-sequence current sensor and the load-end conductive rod, and provide a supporting foundation for the traveling wave combined current sensor and the zero-sequence current sensor when they are sleeved on the outer periphery of the load-end conductive rod, thus making the installation stability of the entire solid-sealed pole higher.

[0010] Optionally, a heat exchange plate is embedded in the insulating support casting body, and the heat exchange plate, the insulating support casting body, and a portion of the metal shielding heat exchange assembly define the heat dissipation chamber.

[0011] The above technical solution is adopted: by setting up heat exchange plates, the heat dissipation chamber is separated from the outside world by only one heat exchange plate. However, the heat exchange plate also has heat exchange performance, which can dissipate the heat in the heat dissipation chamber to the outside atmosphere through the heat exchange plate, thereby allowing the temperature of the heat dissipation chamber to gradually decrease. In addition, the heat exchange plate can also isolate the heat dissipation chamber from the outside world, preventing external impurities from entering the heat dissipation chamber.

[0012] Optionally, the metal shielded heat exchange assembly includes a heat exchange tube and a shielding annular plate. The heat exchange tube is disposed in the mounting cavity and is coaxially arranged with the load-end conductive rod. The shielding annular plate is connected to the inner peripheral wall of the heat exchange tube and is coaxially arranged with the load-end conductive rod. The tube end of the heat exchange tube abuts against the inner end wall of the mounting cavity, and the inner ring edge of the shielding annular plate abuts against the inner ring wall of the mounting cavity. The first chamber and the second chamber are both located inside the heat exchange tube and are located on both sides of the shielding annular plate, respectively. The heat dissipation chamber is defined by the outer tube wall of the heat exchange tube, the inner side wall of the heat exchange plate, and the inner end wall of the insulating support casting.

[0013] The above technical solution involves using a shielding annular plate within the heat exchange tube to isolate a first chamber and a second chamber. This shielding annular plate also provides electromagnetic shielding, reducing signal interference between the traveling wave combined current sensor in the first chamber and the zero-sequence current sensor in the second chamber. Simultaneously, a heat dissipation chamber is defined between the outer wall of the heat exchange tube, the inner wall of the heat exchange fins, and the inner end wall of the insulating support casting. This positions the first and second chambers further away from the heat exchange fins, thus reducing the likelihood of electromagnetic leakage and ensuring the stability of the first and second chambers.

[0014] Optionally, the shielding annular plate is slidably connected to the heat exchange tube along the axial direction of the heat exchange tube.

[0015] The above technical solution is adopted because different traveling wave ranging type integrated primary and secondary pole-mounted circuit breakers have different models. Therefore, the traveling wave combined current sensor and the zero-sequence current sensor installed with them are often different in size. However, in most cases, the traveling wave combined current sensor is mainly used to capture high-frequency (kHz to MHz level) weak fault transient current traveling wave signals, which is the main basis for fault judgment of the circuit breaker. Therefore, the design size of the traveling wave combined current sensor is larger than that of the zero-sequence current sensor. At this time, the shielding ring plate can be slid to one side of the second chamber, so that the volume of the first chamber increases and the volume of the second chamber decreases. This allows the first chamber to be adapted to the traveling wave combined current sensor with a larger design size, and greatly increases the adaptability of the traveling wave ranging type integrated primary and secondary pole-mounted circuit breaker.

[0016] It is worth noting that since zero-sequence current sensors are mainly used to measure zero-sequence current at the power frequency (50Hz), the design size of zero-sequence current sensors does not need to be particularly large. As long as they can measure zero-sequence current at the power frequency (50Hz), the size requirement of zero-sequence current sensors is relatively lower.

[0017] Optionally, sliding blocks are provided on opposite sides of the shielding annular plate, and sliding grooves are provided in the inner wall of the heat exchange tube along the length of the heat exchange tube, with the sliding blocks slidingly engaging with the sliding grooves; The cross-sectional shape of the sliding block and the sliding groove is T-shaped or trapezoidal.

[0018] Using the above technical solution: when it is necessary to adjust the volume of the first chamber and the second chamber, the sliding block can be pushed directly along the length of the sliding groove, and then the shielding annular plate can be moved along the axial direction of the heat exchange tube, thereby achieving the effect of convenient adjustment.

[0019] Optionally, an insulating rubber layer is provided on the outer peripheral wall of the sliding block, and the insulating rubber layer is pressed and fitted with the inner wall of the sliding groove.

[0020] The above technical solution is adopted: by setting the insulating rubber layer, the sliding block can be pressed against the current position when it moves to the required position, so that the position of the shielding ring plate can be relatively locked and it is not easy to slide on its own.

[0021] Optionally, a strip-shaped hole is formed through the wall of the heat exchange tube along its thickness direction, and the length direction of the strip-shaped hole is consistent with and connected to the length direction of the sliding groove; A movable baffle is connected to the sliding block. The movable baffle includes an axial plate segment and a radial plate segment that are vertically connected. The axial plate segment extends in the same direction as the sliding groove and is connected to the sliding block. The radial plate segment is vertically connected to the end of the axial plate segment away from the sliding block. The opposing side walls of the axial plate segment slide against the two opposing inner side walls of the strip hole. The strip hole has the same width as the sliding groove. The radial plate segment is directly opposite the first side wall of the strip hole, and a heat exchange channel is defined between the radial plate segment and the second side wall of the strip hole. The heat exchange channel connects the first chamber and the heat dissipation chamber.

[0022] The above technical solution allows for heat exchange between the first and second chambers via the outer walls of heat exchange tubes and the heat dissipation chamber. This ensures that the heat generated by both the traveling wave combined current sensor and the zero-sequence current sensor can be transferred to the heat dissipation chamber. However, as mentioned earlier, in most cases, the traveling wave combined current sensor is primarily used to capture high-frequency (kHz to MHz) and weak fault transient current traveling wave signals, serving as the main basis for fault diagnosis in circuit breakers. Therefore, the traveling wave combined current sensor has a higher priority than the zero-sequence current sensor, meaning its heat dissipation priority is also higher. In this case, the first chamber can be directly connected to the heat dissipation chamber via heat exchange channels formed within the slotted holes. This results in a better heat dissipation effect for the traveling wave combined current sensor compared to the zero-sequence current sensor.

[0023] However, although the heat dissipation priority of the traveling wave combined current sensor is higher than that of the zero-sequence current sensor, it does not mean that the zero-sequence current sensor does not need heat dissipation. Therefore, the size of the heat exchange channel can be adapted to the size of the traveling wave combined current sensor. That is, when the design size of the traveling wave combined current sensor is not very large, the heat exchange channel does not need to be particularly large, so that the heat entering the heat dissipation chamber through the heat exchange channel in the first chamber does not need to be particularly urgent. When the design size of the traveling wave combined current sensor is larger, since the larger traveling wave combined current sensor requires a larger first chamber to accommodate it, the shielding ring plate will move towards the second chamber side before the larger traveling wave combined current sensor is installed in the first chamber. At this time, the sliding block will drive the radial plate segment in the moving baffle to move towards the first side wall of the strip hole, that is, gradually away from the second side wall of the strip hole. At this time, the width of the heat exchange channel will become larger to accommodate the larger traveling wave combined current sensor.

[0024] Based on this, the width of the heat exchange channel is automatically adjusted according to the different design sizes of the traveling wave combined current sensors installed in the first chamber. That is, if a larger traveling wave combined current sensor requires a stronger heat dissipation effect, the width of the heat exchange channel will automatically increase. Conversely, if a relatively smaller traveling wave combined current sensor does not require a good heat dissipation effect, the width of the heat exchange channel can be adaptively reduced. This allows the entire traveling wave ranging type primary and secondary integrated pole-mounted circuit breaker to be adaptively adjusted to accommodate traveling wave combined current sensors of different design sizes, thereby improving the service life of the entire equipment.

[0025] Optionally, the heat exchange plates and the heat exchange tubes are both made of high thermal conductivity insulating engineering plastics or high thermal conductivity insulating engineering ceramic materials; And / or, the shielding annular plate is made of silicon steel, permalloy, or nickel-iron alloy. And / or, the insulating support casting is made of epoxy resin material.

[0026] Optionally, the insulating shell is further provided with a vacuum interrupter, and the first chamber is closer to the vacuum interrupter than the second chamber.

[0027] This application has at least the following beneficial technical effects: 1. By setting up an installation cavity around the conductive rod at the load end within an insulating shell, and dividing the installation cavity into a first chamber, a second chamber, and a heat dissipation chamber using a metal shielded heat exchange assembly, the traveling wave combined current sensor and the zero-sequence current sensor are located in independent spatial regions, and an electromagnetic isolation structure is formed between the two chambers. This weakens the coupling tendency between signals of different frequency bands from a structural path perspective, which is beneficial to maintaining the independence and stability of their respective detection signals. At the same time, the metal shielded heat exchange assembly, in addition to achieving electromagnetic shielding, also acts as a heat conduction channel, allowing the heat generated in the first and second chambers to be transferred to the heat dissipation chamber, and gradually diffused through the heat exchange relationship between the heat dissipation chamber and the outside world, thereby alleviating the phenomenon of local heat accumulation to a certain extent. In addition, the first and second chambers operate in a structural environment isolated from the outside world, which is beneficial to reducing the risk of electromagnetic leakage. With the establishment of a heat conduction path, the internal sensors maintain a relatively stable working state in the electromagnetic and thermal environment, thereby improving the overall operational reliability and service life of the device. 2. By setting strip-shaped holes on the heat exchanger tube wall and using a movable baffle structure, an adjustable heat exchange channel is formed between the first chamber and the heat dissipation chamber. Structurally, this creates a direct heat exchange channel that is distinct from the conduction path of the heat exchanger tube wall, thereby enhancing the heat dissipation capacity of the first chamber to a certain extent. Simultaneously, the movable baffle moves along the sliding groove with the sliding block, and the relative position change between its radial plate segment and the sidewall of the strip-shaped hole corresponds to the change in the width of the heat exchange channel. This allows the flow cross-section of the heat exchange channel to change synchronously with the adjustment of the shielding annular plate position, increasing the volume of the first chamber to accommodate larger dimensions. In the case of a traveling wave combined current sensor, the width of the heat exchange channel is increased accordingly, which is beneficial to matching the heat dissipation requirements under high heat load conditions. When the volume of the first chamber is small, the width of the heat exchange channel is relatively reduced, which is beneficial to maintaining the overall coordination of heat exchange. In addition, this structure achieves adaptive adjustment of heat exchange capacity through mechanical linkage, which can match the heat dissipation requirements of sensors of different sizes without additional control components. Thus, while taking into account the heat dissipation differences between traveling wave combined current sensors and zero-sequence current sensors, it is beneficial to maintain the operational stability and long-term reliability of the device under various operating conditions. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0030] Figure 1 This is a schematic diagram of the overall structure of the traveling wave ranging type primary and secondary integrated pole-mounted circuit breaker provided in the embodiments of this application; Figure 2 This is a side sectional view of the traveling wave ranging type primary and secondary integrated pole-mounted circuit breaker provided in the embodiments of this application; Figure 3 This is a partial cross-sectional view of the traveling wave ranging type primary and secondary integrated pole-mounted circuit breaker provided in the embodiments of this application; Figure 4 yes Figure 3 An enlarged schematic diagram of part A in the middle; Figure 5 This is a partial structural diagram showing the connection relationship between the heat exchange tube and the shielding annular plate in an embodiment of this application; Figure 6 yes Figure 5 Enlarged view of part B in the image.

[0031] Explanation of reference numerals in the attached figures: 1. Chassis; 2. Solid-sealed pole; 21. Insulating shell; 211. Vacuum interrupter; 22. Load-end conductive rod; 23. Insulating support casting; 3. Traveling wave combined current sensor; 4. Mounting cavity; 41. First chamber; 42. Second chamber; 43. Heat dissipation chamber; 5. Zero-sequence current sensor; 6. Metal shielded heat exchange assembly; 61. Heat exchange tube; 611. Sliding groove; 612. Strip hole; 6121. Heat exchange channel; 62. Shielding annular plate; 621. Sliding block; 622. Insulating rubber layer; 7. Heat exchange fins; 8. Moving baffle; 81. Axial plate segment; 82. Radial plate segment. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0033] This application provides a traveling wave ranging type integrated primary and secondary pole-mounted circuit breaker. Please refer to [link to relevant documentation]. Figure 1 and Figure 2 The circuit breaker includes a chassis 1, a solid-sealed pole 2, a traveling wave combined current sensor 3, a zero-sequence current sensor 5, and a metal-shielded heat exchange assembly 6.

[0034] For example, the chassis 1 serves as an integral load-bearing structure, and multiple solid-sealed poles 2 are arranged at intervals along the length of the chassis 1. Each solid-sealed pole 2 includes an insulating shell 21 and a load-end conductive rod 22. The insulating shell 21 adopts an integral casting structure and is fixedly installed on the chassis 1. The load-end conductive rod 22 is arranged to penetrate the insulating shell 21 laterally and one end extends to the outside of the insulating shell 21 for connection with external power lines.

[0035] For example, an annular space is formed inside the insulating housing 21 around the outer periphery of the load-end conductive rod 22 and an installation cavity 4 is provided. The installation cavity 4 extends axially along the load-end conductive rod 22, and both the traveling wave combined current sensor 3 and the zero-sequence current sensor 5 are embedded in the installation cavity 4.

[0036] Specifically, the traveling wave combined current sensor 3 and the zero-sequence current sensor 5 are arranged adjacent to each other along the axial direction of the load-end conductive rod 22. They are used to sense current signals of different frequency bands, respectively. The traveling wave combined current sensor 3 is used to capture high-frequency transient traveling wave signals, and the zero-sequence current sensor 5 is used to detect power frequency zero-sequence current signals.

[0037] For example, a metal shielded heat exchange assembly 6 is further provided inside the mounting cavity 4. The metal shielded heat exchange assembly 6 has a hollow partition structure and cooperates with the inner wall of the mounting cavity 4 in the radial and axial directions, thereby dividing the mounting cavity 4 into a first chamber 41, a second chamber 42 and a heat dissipation chamber 43 located in the area between or adjacent to the two.

[0038] Specifically, the first chamber 41 is used to accommodate the traveling wave combined current sensor 3, and the second chamber 42 is used to accommodate the zero-sequence current sensor 5.

[0039] In some exemplary embodiments, the metal-shielded heat exchange assembly 6 is made of a metal material with high thermal conductivity and electromagnetic shielding capability. Its structure continuously surrounds the first chamber 41 and the second chamber 42, forming an isolation path at the electromagnetic level. This makes it difficult for the electromagnetic field generated by the high-frequency traveling wave signal during its propagation in the first chamber 41 to couple into the second chamber 42. At the same time, the low-frequency magnetic field change corresponding to the zero-sequence current sensor 5 is also difficult to couple back into the first chamber 41. This reduces the crosstalk tendency between signals of different frequency bands to a certain extent, which is beneficial to maintaining the independence and stability of their respective measurement signals.

[0040] For example, the metal shielded heat exchange component 6 forms a heat conduction contact path with the inner walls of the first chamber 41 and the second chamber 42. When the traveling wave combined current sensor 3 or the zero-sequence current sensor 5 generates heat during operation, the heat can be conducted along its outer surface to the metal shielded heat exchange component 6 and further conducted to the heat dissipation chamber 43 area. The heat dissipation chamber 43 and the external environment form a heat exchange relationship through the preset heat conduction path or indirect heat exchange interface in the insulating shell 21, so that the heat gradually diffuses to the outside. Combined with the high thermal conductivity of the metal material and the intermediate buffer structure of the heat dissipation chamber 43, the heat distribution inside the first chamber 41 and the second chamber 42 tends to be uniform and transferred to the outside, which is beneficial to reduce the phenomenon of local temperature rise concentration, thereby improving the thermal stability of the sensor during long-term operation to a certain extent.

[0041] In addition, the first chamber 41 and the second chamber 42 are structurally independent and separated by the metal shielded heat exchange component 6. The two are electrically isolated from the outside world by the insulating shell 21. While maintaining the electromagnetic shielding effect, the heat conduction path is also established, so that the internal components can maintain a relatively stable working state in complex electromagnetic and thermal environments, which is beneficial to extending the reliable service life of the whole machine under long-term outdoor operation conditions.

[0042] In some implementations, such as Figure 1 , Figure 2 and Figure 3 As shown, the solid-sealed pole 2 also includes an insulating support casting body 23, which is integrally formed inside the insulating shell 21 and covers the outer periphery of the load-end conductive rod 22. The mounting cavity 4 is directly opened inside the insulating support casting body 23 and extends along the axial direction of the load-end conductive rod 22.

[0043] For example, the insulating support casting body 23 can be made of epoxy resin or other casting materials with good electrical insulation properties and mechanical strength. During the molding process, it forms a close fit with the load end conductive rod 22, structurally constructing a continuous insulating isolation layer. This ensures that the traveling wave combined current sensor 3 and the zero-sequence current sensor 5 are electrically isolated from the conductive parts when they are arranged around the load end conductive rod 22. At the same time, the insulating support casting body 23 forms a boundary for the mounting cavity 4 in the radial direction, providing a stable mounting base for the traveling wave combined current sensor 3 and the zero-sequence current sensor 5.

[0044] It is understandable that under external vibration or electrodynamic action, the insulating casting can provide a constraint and support effect on the sensor structure, thereby reducing the tendency of sensor position displacement or loosening to a certain extent, which is beneficial to maintaining the assembly stability and long-term operational reliability of the solidified pole 2 overall structure.

[0045] For example, a heat exchange plate 7 is pre-embedded inside the insulating support casting body 23. The heat exchange plate 7 can be made of a metal material with high thermal conductivity and form an embedded fit with the insulating support casting body 23 during the casting process. One side of the heat exchange plate 7 is arranged adjacent to the heat dissipation chamber 43, and the other side extends toward the outer wall of the insulating shell 21 or is adjacent to the external heat exchange interface.

[0046] It is understandable that the boundary structure of the heat dissipation chamber 43 is defined by the spatial cooperation between the heat exchange plate 7, the insulating support casting body 23 and the metal shield heat exchange component 6. In the heat conduction path, the heat accumulated in the heat dissipation chamber 43 can be transferred to the heat exchange plate 7 through the metal shield heat exchange component 6, and then diffused to the external environment through the heat exchange plate 7. Since the heat exchange plate 7 has high thermal conductivity, it forms a low thermal resistance channel in the heat flow path, which is beneficial to accelerate the process of heat transfer from the inside of the heat dissipation chamber 43 to the outside, so that the temperature inside the heat dissipation chamber 43 shows a gradual downward trend.

[0047] Meanwhile, the heat exchange plate 7 forms an isolation interface between the heat dissipation chamber 43 and the outside world. This interface is a solid structure and is integrated with the insulating support casting body 23. While ensuring the continuity of the heat conduction channel, it forms a blocking path for external dust, water vapor and other impurities, thereby maintaining the stability of the internal environment of the heat dissipation chamber 43 to a certain extent, and is beneficial to forming a relatively stable working space for the internal sensors in conjunction with the metal shielded heat exchange component 6.

[0048] In some implementations, such as Figure 3 , Figure 4As shown, the metal shielded heat exchange assembly 6 includes a heat exchange tube 61 and a shielding annular plate 62. The heat exchange tube 61 is arranged inside the mounting cavity 4 and extends coaxially along the axis of the load-end conductive rod 22. The heat exchange tube 61 has a hollow cylindrical structure, and its axis is consistent with the load-end conductive rod 22, thereby forming an annular gap structure in the radial direction for other components to be arranged.

[0049] For example, the shielding annular plate 62 is connected to the inner peripheral wall of the heat exchange tube 61 and located in the middle region of the inner cavity of the heat exchange tube 61. The central hole of the shielding annular plate 62 is coaxially arranged with the load end conductive rod 22. The inner ring edge of the shielding annular plate 62 forms an abutting fit with the inner ring wall of the mounting cavity 4. This abutting relationship constructs a continuous annular shielding path in the structure. At the same time, the tube end of the heat exchange tube 61 forms an abutting relationship with the inner end wall of the mounting cavity 4, which defines the position of the heat exchange tube 61 in the axial direction, so that the heat exchange tube 61 forms a stable support structure in the mounting cavity 4.

[0050] It is understandable that, in terms of spatial division, both the first chamber 41 and the second chamber 42 are located inside the heat exchange tube 61 and on both sides of the shielding annular plate 62. The shielding annular plate 62 divides the inner cavity of the heat exchange tube 61 in the axial direction, thereby accommodating the traveling wave combined current sensor 3 and the zero-sequence current sensor 5 in independent chamber spaces. Since the shielding annular plate 62 is made of a conductive metal material, it forms a shielding interface under the action of an electromagnetic field. The electromagnetic fields generated by the high-frequency traveling wave signal and the power frequency signal during their propagation in their respective chambers are difficult to couple across this interface, thereby reducing the signal interference tendency between different sensors to a certain extent and helping to maintain the independence of the detection signal.

[0051] Meanwhile, the outer wall of the heat exchange tube 61, the inner wall of the heat exchange plate 7, and the inner end wall of the insulating support casting 23 together form a heat dissipation chamber 43. The heat dissipation chamber 43 is located outside the heat exchange tube 61 and forms an indirect thermal connection path with the first chamber 41 and the second chamber 42. During the heat conduction process, the heat generated in the first chamber 41 and the second chamber 42 can be transferred to the heat dissipation chamber 43 through the wall of the heat exchange tube 61, and then diffused to the outside through the heat exchange plate 7. Since the first chamber 41 and the second chamber 42 are located inside the heat exchange tube 61 and relatively far away from the heat exchange plate 7, they form a multi-layered barrier path with the external environment, which creates additional attenuation on the electromagnetic propagation path, which is beneficial to reduce the tendency of electromagnetic leakage. At the same time, the multi-layered structure provides a buffer in the mechanical and thermal environment, thereby maintaining the working stability of the internal sensor to a certain extent.

[0052] In some implementations, such as Figure 5 , Figure 6 As shown, the shielding annular plate 62 is slidably connected to the inner cavity of the heat exchange tube 61 along the axial direction of the heat exchange tube 61.

[0053] Specifically, the shielding annular plate 62 is not a fixed installation structure, but a partition member with an adjustable position formed inside the heat exchange tube 61. Its axial position corresponds to the boundary position between the first chamber 41 and the second chamber 42. By changing this boundary position, the axial length of the two chambers can be redistributed.

[0054] In practical applications, the traveling wave combined current sensor 3 and zero-sequence current sensor 5 corresponding to different models of traveling wave ranging type primary and secondary integrated pole-mounted circuit breakers differ in terms of external dimensions and installation requirements. The traveling wave combined current sensor 3 is used to collect high-frequency transient signals and has high requirements for magnetic circuit structure and coil layout. Its overall size is usually relatively large. On the other hand, the zero-sequence current sensor 5 is mainly for power frequency signal measurement, and its structural size has relatively compressed space. Therefore, by moving the shielding annular plate 62 along the axial direction of the heat exchange tube 61 towards the second chamber 42, the axial volume of the first chamber 41 increases accordingly, and the axial volume of the second chamber 42 decreases accordingly. This structure provides adjustable chamber volume without changing the overall external dimensions, which is beneficial for adapting to the sensor arrangement requirements of different size combinations, thereby improving the versatility and adaptability of the whole structure to a certain extent.

[0055] For example, each of the opposite sides of the shielding annular plate 62 is provided with a sliding block 621, and the inner wall of the heat exchange tube 61 is provided with a sliding groove 611 along its length. The sliding block 621 is embedded in the sliding groove 611 and forms a sliding fit relationship with the sliding groove 611. The sliding groove 611 extends axially and passes through a predetermined adjustment stroke range. The movement path of the sliding block 621 in the sliding groove 611 defines the movement trajectory of the shielding annular plate 62, so that the shielding annular plate 62 remains coaxial with the axis of the heat exchange tube 61 during the adjustment process.

[0056] For example, in order to avoid tilting or shifting to a certain extent and thus affecting the separation effect of the first chamber 41 and the second chamber 42, the cross-sectional shape of the sliding block 621 and the sliding groove 611 can be T-shaped or trapezoidal. Such structures form a limiting boundary in the radial direction, which has a covering and restraining effect on the sliding block 621 during the sliding process, thereby reducing the possibility of the sliding block 621 disengaging from the sliding groove 611 to a certain extent and improving the guiding stability.

[0057] In some embodiments, an insulating rubber layer 622 is provided on the outer peripheral wall of the sliding block 621. The insulating rubber layer 622 and the inner wall of the sliding groove 611 form a compression fit relationship. This compression fit is due to the elastic deformation characteristics of the rubber material. After the sliding block 621 moves to the target position, the insulating rubber layer 622 generates contact pressure on the inner wall of the sliding groove 611 under the action of the recovery tendency, thereby forming frictional resistance at the contact interface. This frictional resistance provides a position holding effect for the shielding ring plate 62, so that it maintains a relatively stable position under the condition of no external force, which is beneficial to reduce the tendency of the shielding ring plate 62 to shift position due to vibration or electrodynamic force during operation.

[0058] At the same time, the insulating rubber layer 622 has electrical insulation properties, forming an insulating isolation interface between the sliding block 621 and the heat exchange tube 61, thereby reducing the possibility of forming a conductive path to a certain extent, and helping to maintain the electromagnetic isolation effect between the chambers in conjunction with the overall structure of the metal shielded heat exchange assembly 6, thus forming a coordinated relationship between structural adjustment and electromagnetic performance.

[0059] In some implementations, combined Figure 3 , Figure 4 A strip-shaped hole 612 is provided through the wall of the heat exchange tube 61 along its thickness direction. The strip-shaped hole 612 extends axially along the heat exchange tube 61, and its length direction is consistent with the extension direction of the sliding groove 611 and they are interconnected, thereby constructing a through channel between the inside and outside of the heat exchange tube 61 and forming a local opening area in the spatial structure.

[0060] For example, a movable baffle 8 is connected to the sliding block 621. The movable baffle 8 includes an axial plate segment 81 and a radial plate segment 82. The axial plate segment 81 is fixedly connected to the sliding block 621 and extends along the sliding groove 611. The radial plate segment 82 is perpendicularly connected to the end of the axial plate segment 81 away from the sliding block 621 and extends toward the location of the strip hole 612.

[0061] Specifically, the two side walls of the axial plate segment 81 respectively form a sliding contact relationship with the two opposite inner side walls of the strip hole 612. This contact relationship defines the movement path of the movable baffle 8 in the strip hole 612, so that the movable baffle 8 maintains a stable posture during the movement of the sliding block 621. The strip hole 612 and the sliding groove 611 are consistent in the width direction, so that the combined structure of the sliding block 621 and the movable baffle 8 forms a continuous transition interface during the movement.

[0062] Furthermore, the radial plate segment 82 is disposed opposite to the first side end wall of the strip hole 612, and forms a gap space between it and the second side end wall of the strip hole 612. This gap space constitutes a heat exchange channel 6121, which connects the first chamber 41 and the heat dissipation chamber 43, forming a direct connection in the heat conduction path. Compared with the method of conduction only through the wall of the heat exchange tube 61, the heat exchange channel 6121 provides an additional heat release path for the first chamber 41. The heat generated during the operation of the traveling wave combined current sensor 3 can be partially diffused to the heat dissipation chamber 43 through this channel, thereby enhancing the heat dissipation capacity of the first chamber 41 to a certain extent.

[0063] It is understandable that, further combined with the axially adjustable structure of the shielding annular plate 62, when the shielding annular plate 62 moves towards the second chamber 42 to expand the volume of the first chamber 41, the sliding block 621 moves synchronously along the sliding groove 611 and drives the moving baffle 8 to shift as a whole. The position of the radial plate segment 82 relative to the first side end wall of the strip hole 612 changes, and the distance between it and the second side end wall increases accordingly. This results in a corresponding expansion of the flow cross-sectional size of the heat exchange channel 6121, forming a channel size relationship that adjusts with the change of the chamber volume. This relationship allows the heat dissipation channel to expand synchronously when the volume of the first chamber 41 increases, which is beneficial for matching the higher heat load generated by the larger traveling wave combined current sensor 3 during operation.

[0064] When the shielding ring plate 62 moves in the opposite direction, the radial plate segment 82 gradually approaches the second side wall of the strip hole 612, and the width of the heat exchange channel 6121 decreases accordingly, thus forming a restricted state on the heat exchange path. This reduces the direct heat exchange between the first chamber 41 and the heat dissipation chamber 43. This structure meets the requirements of sensor layout of different sizes while enabling the heat dissipation path to have linkage adjustment characteristics. Without introducing additional control structure, the heat exchange capacity is matched by mechanical position change, which is beneficial to maintaining the thermal balance between the sensors under different working conditions, and to a certain extent takes into account the heat dissipation difference requirements between the traveling wave combined current sensor 3 and the zero-sequence current sensor 5.

[0065] It is worth noting that since both the first chamber 41 and the second chamber 42 are connected to the heat dissipation chamber 43 through the outer wall of the heat exchange tube 61, the heat generated by the traveling wave combined current sensor 3 and the zero-sequence current sensor 5 during operation can be transferred to the heat dissipation chamber 43. However, as mentioned earlier, in most cases, the traveling wave combined current sensor 3 is mainly used to capture high-frequency (kHz to MHz level) weak fault transient current traveling wave signals, which is the main basis for fault judgment of the circuit breaker. Therefore, the priority of the traveling wave combined current sensor 3 is higher than that of the zero-sequence current sensor 5, that is, the heat dissipation priority of the traveling wave combined current sensor 3 is also higher than that of the zero-sequence current sensor 5. Therefore, in this case, the first chamber 41 and the heat dissipation chamber 43 can be directly connected through the heat exchange channel 6121 formed in the strip hole 612. In this way, the heat dissipation effect of the traveling wave combined current sensor 3 will be better than that of the zero-sequence current sensor 5.

[0066] However, although the heat dissipation priority of the traveling wave combined current sensor 3 is higher than that of the zero-sequence current sensor 5, it does not mean that the zero-sequence current sensor 5 does not need heat dissipation. Therefore, the size of the heat exchange channel 6121 can be adapted to the size of the traveling wave combined current sensor 3. That is, when the design size of the traveling wave combined current sensor 3 is not very large, the heat exchange channel 6121 does not need to be particularly large, so that the heat entering the heat dissipation chamber 43 through the heat exchange channel 6121 in the first chamber 41 does not need to be particularly urgent; however, when the design size of the traveling wave combined current sensor 3 is larger, since the larger traveling wave combined current sensor 3 requires a larger first chamber 41 to fit, the shielding ring plate 62 will move towards the second chamber 42 before the larger traveling wave combined current sensor 3 is installed in the first chamber 41. At this time, the sliding block 621 will drive the radial plate segment 82 in the moving baffle 8 to move towards the first side end wall close to the strip hole 612, that is, gradually away from the second side end wall of the strip hole 612. At this time, the width of the heat exchange channel 6121 will become larger to fit the larger traveling wave combined current sensor 3.

[0067] Based on this, the width of the heat exchange channel 6121 is automatically adjusted according to the different design sizes of the traveling wave combined current sensors 3 installed in the first chamber 41. That is, if the larger traveling wave combined current sensor 3 requires a stronger heat dissipation effect, the width of the heat exchange channel 6121 will automatically increase. Conversely, if the relatively smaller traveling wave combined current sensor 3 does not require a good heat dissipation effect, the width of the heat exchange channel 6121 can be adaptively reduced. This allows the entire traveling wave ranging type primary and secondary integrated pole-mounted circuit breaker to be adaptively adjusted to accommodate traveling wave combined current sensors 3 of different design sizes, thereby improving the service life of the entire equipment.

[0068] In some embodiments, both the heat exchange plate 7 and the heat exchange tube 61 are made of high thermal conductivity insulating engineering plastic or high thermal conductivity insulating engineering ceramic material. The high thermal conductivity insulating engineering plastic may include a composite resin system filled with thermally conductive filler, and the high thermal conductivity insulating engineering ceramic may be made of materials such as alumina or aluminum nitride. These materials maintain high thermal conductivity while having good electrical insulation properties, thereby forming a structural unit that combines thermal conductivity and insulation in the heat conduction path.

[0069] It is understood that the heat exchange plate 7 is located between the heat dissipation chamber 43 and the outside world, and the heat exchange tube 61 is located between the first chamber 41, the second chamber 42 and the heat dissipation chamber 43. When the internal sensor generates heat, the heat can be transferred to the outside through the heat exchange tube 61 and further diffused to the external environment through the heat exchange plate 7. Since the material itself has electrical insulation capability, it isolates the current path while forming a heat flow channel, thereby reducing the tendency of conductive coupling to a certain extent, which is beneficial to maintaining the electrical stability of the sensor detection environment.

[0070] For example, the shielding ring plate 62 is made of silicon steel, permalloy, or nickel-iron alloy. These materials have high magnetic permeability and can form a magnetic flux concentration path under the action of an electromagnetic field, thereby constructing an effective electromagnetic shielding interface between the first chamber 41 and the second chamber 42. Under the condition of coexistence of high-frequency traveling wave signals and power frequency signals, magnetic fields of different frequency bands produce an attenuation effect at this interface, which is beneficial to reducing the degree of signal coupling.

[0071] For example, the insulating support casting body 23 is made of epoxy resin material. After curing, the epoxy resin forms a dense structure and has good mechanical strength and insulation properties. It forms a covering and supporting relationship for the load end conductive rod 22 and various sensors inside the solidified pole post 2, providing a stable installation foundation in terms of structure. At the same time, it forms a continuous insulating medium in terms of electrical level, which is beneficial to maintaining the stability of the electric field distribution in the internal space. Furthermore, a vacuum interrupter 211 is set inside the insulating shell 21. The vacuum interrupter 211 is used to perform the arc extinguishing function during the current interruption process. It may generate electromagnetic disturbances and local temperature rise during operation.

[0072] In some implementations, combined Figure 2 The insulating outer shell 21 is also provided with a vacuum interrupter 211, and the first chamber 41 is closer to the vacuum interrupter 211 than the second chamber 42.

[0073] It is understandable that the traveling wave combined current sensor 3 is installed closer to the vacuum interrupter 211, so as to minimize the loss and reflection of the traveling wave signal on the conductive rod path before it reaches the sensor.

[0074] Meanwhile, combined with the electromagnetic shielding characteristics of the shielding ring plate 62, the traveling wave combined current sensor 3, which is deployed close to the ground, has a shorter propagation distance in the transient signal acquisition path, which is beneficial to improving the response capability to high-frequency transient characteristics. At the same time, the shielding ring plate 62 is located between the two chambers, forming an isolation boundary for the second chamber 42 in terms of structure, thereby reducing the electromagnetic influence on the zero-sequence current sensor 5 during the operation of the vacuum interrupter 211 to a certain extent. In addition, with the heat conduction path of the multi-layer structure, each functional unit can maintain a relatively stable working state in the electromagnetic and thermal environment.

[0075] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0076] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0077] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0078] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A traveling wave ranging type integrated primary and secondary pole-mounted circuit breaker, characterized in that, include: Chassis (1); A number of solid-sealed poles (2) are arranged at intervals on the chassis (1). Each solid-sealed pole (2) includes an insulating shell (21) and a load-end conductive rod (22). The insulating shell (21) is installed on the chassis (1). The load-end conductive rod (22) is inserted laterally into the insulating shell (21) and extends out from one side of the insulating shell (21). The traveling wave combined current sensor (3) has an installation cavity (4) located on the outer periphery of the load end conductive rod (22) inside the insulating shell (21), and the traveling wave combined current sensor (3) is embedded in the installation cavity (4); A zero-sequence current sensor (5) is embedded in the mounting cavity (4) and arranged adjacent to the traveling wave combined current sensor (3) along the axial direction of the load-end conductive rod (22); and A metal-shielded heat exchange assembly (6) is installed in the mounting cavity (4) and divides the mounting cavity (4) into a first chamber (41), a second chamber (42) and a heat dissipation chamber (43). The traveling wave combined current sensor (3) is located in the first chamber (41), and the zero-sequence current sensor (5) is located in the second chamber (42). The first chamber (41) and the second chamber (42) are electromagnetically isolated. The heat dissipation chamber (43) is in heat exchange cooperation with the outside world, the first chamber (41) and the second chamber (42).

2. The traveling wave ranging type integrated primary and secondary pole-mounted circuit breaker according to claim 1, characterized in that, The solidified pole (2) also includes an insulating support casting body (23), which is disposed inside the insulating shell (21) and located on the outer periphery of the load end conductive rod (22). The mounting cavity (4) is opened inside the insulating support casting body (23).

3. A traveling wave ranging type integrated primary and secondary pole-mounted circuit breaker according to claim 2, characterized in that, The insulating support casting body (23) is embedded with heat exchange plates (7), and the heat exchange plates (7), the insulating support casting body (23), and the metal shielding heat exchange assembly (6) partially define the heat dissipation chamber (43).

4. A traveling wave ranging type integrated primary and secondary pole-mounted circuit breaker according to claim 3, characterized in that, The metal shielded heat exchange assembly (6) includes a heat exchange tube (61) and a shielding annular plate (62). The heat exchange tube (61) is located in the mounting cavity (4) and is coaxially arranged with the load end conductive rod (22). The shielding annular plate (62) is connected to the inner peripheral wall of the heat exchange tube (61) and is coaxially arranged with the load end conductive rod (22). The tube end of the heat exchange tube (61) abuts against the inner end wall of the mounting cavity (4), and the inner ring edge of the shielding annular plate (62) abuts against the inner ring wall of the mounting cavity (4). The first chamber (41) and the second chamber (42) are both located inside the heat exchange tube (61) and on both sides of the shielding annular plate (62). The heat dissipation chamber (43) is defined by the outer wall of the heat exchange tube (61), the inner wall of the heat exchange plate (7), and the inner end wall of the insulating support casting body (23).

5. A traveling wave ranging type integrated primary and secondary pole-mounted circuit breaker according to claim 4, characterized in that, The shielding annular plate (62) is slidably connected to the heat exchange tube (61) along the axial direction of the heat exchange tube (61).

6. A traveling wave ranging type integrated primary and secondary pole-mounted circuit breaker according to claim 5, characterized in that, Sliding blocks (621) are provided on opposite sides of the shielding annular plate (62), and sliding grooves (611) are provided in the inner wall of the heat exchange tube (61) along the length of the heat exchange tube (61). The sliding blocks (621) and the sliding grooves (611) are slidably engaged. The cross-sectional shape of the sliding block (621) and the sliding groove (611) is T-shaped or trapezoidal.

7. A traveling wave ranging type integrated primary and secondary pole-mounted circuit breaker according to claim 6, characterized in that, An insulating rubber layer (622) is provided on the outer peripheral wall of the sliding block (621), and the insulating rubber layer (622) is pressed and fitted with the inner wall of the sliding groove (611).

8. A traveling wave ranging type integrated primary and secondary pole-mounted circuit breaker according to claim 6, characterized in that, The heat exchange tube (61) has a strip-shaped hole (612) extending through its thickness along the tube wall. The length direction of the strip-shaped hole (612) is consistent with and connected to the length direction of the sliding groove (611). A movable baffle (8) is connected to the sliding block (621). The movable baffle (8) includes a vertically connected axial plate segment (81) and a radial plate segment (82). The axial plate segment (81) extends in the same direction as the sliding groove (611) and is connected to the sliding block (621). The radial plate segment (82) is vertically connected to the end of the axial plate segment (81) away from the sliding block (621). The opposing side walls of the axial plate segment (81) slide against the two opposing inner side walls of the strip hole (612). The strip hole (612) has the same width as the sliding groove (611). The radial plate segment (82) is directly opposite the first side wall of the strip hole (612), and a heat exchange channel (6121) is defined between the radial plate segment (82) and the second side wall of the strip hole (612). The heat exchange channel (6121) connects the first chamber (41) and the heat dissipation chamber (43).

9. A traveling wave ranging type integrated primary and secondary pole-mounted circuit breaker according to any one of claims 4 to 8, characterized in that, The heat exchange plate (7) and the heat exchange tube (61) are both made of high thermal conductivity insulating engineering plastic or high thermal conductivity insulating engineering ceramic material; And / or, the shielding annular plate (62) is made of silicon steel, permalloy, or nickel-iron alloy; And / or, the insulating support casting (23) is made of epoxy resin material.

10. A traveling wave ranging type integrated primary and secondary pole-mounted circuit breaker according to any one of claims 1 to 8, characterized in that, The insulating outer shell (21) is further provided with a vacuum interrupter (211), and the first chamber (41) is closer to the vacuum interrupter (211) than the second chamber (42).

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