Plum blossom contact monitoring sensor, plum blossom contact assembly and circuit breaker

Abstract

The invention provides a tulip contact monitoring sensor, a tulip contact assembly and a circuit breaker, the tulip contact monitoring sensor is provided with an annular shell, the annular shell comprises a first semi-ring shell and a second semi-ring shell, and the first semi-ring shell and the second semi-ring shell are connected through a telescopic structure. The telescopic structure is used for adjusting the area size of the central through hole; a circuit board is mounted in the circuit cavity, and the circuit board is arranged around the central through hole; the circuit board located in the first circuit cavity is movably arranged in the first circuit cavity in the telescopic direction of the telescopic structure, and the circuit board located in the second circuit cavity is fixedly arranged. A magnetic ring is mounted on the circuit board, and the magnetic ring is arranged around the central through hole; a coil is arranged on at least one part of the peripheral wall of the magnetic ring and electrically connected with the circuit board. By applying the tulip contact monitoring sensor, the current measurement precision of the monitoring sensor can be improved, and the electricity taking stability is ensured.

Description

Technical Field

[0001] The present invention relates to the field of sensor technology, and in particular to a plum blossom contact monitoring sensor, a plum blossom contact assembly using the plum blossom contact monitoring sensor, and a circuit breaker using the plum blossom contact assembly. Background Art

[0002] The safe operation of switchgear in power equipment has always been a key focus for industry professionals. The safe operation of high-voltage switchgear is particularly important. The healthy operating status of high-voltage switchgear is primarily reflected in the connection between the contact fingers and the static contacts of the circuit breaker. Wear and aging during connection often lead to poor contact, or excessive load current can cause rapid heating of the connecting parts, leading to spontaneous combustion and explosions, resulting in significant economic losses. Therefore, using sensors to monitor the working status of the circuit breaker's contact fingers is a common practice.

[0003] Existing plum blossom contact sensors usually include a magnetic ring, a coil and a circuit board. The magnetic ring is used to sense the changes in the magnetic field generated by the plum blossom contact, and the coil converts it into an electrical signal, which is used to power the circuit board and is collected, processed and transmitted by the circuit on the circuit board.

[0004] The traditional magnetic ring and circuit board layout method has many technical defects. On the one hand, most sensors use a single-sided or partial magnetic ring layout structure, and the magnetic field of the plum blossom contact can only partially pass through the magnetic ring, resulting in incomplete electrical signals induced by the magnetic ring, which in turn causes distortion and insufficient accuracy of monitoring data. For example, a single-sided magnetic ring cannot uniformly collect the circular magnetic field around the cable, is easily interfered by the environmental magnetic field, and is difficult to accurately reflect the actual current value. In addition, the magnetic ring and circuit board structure of traditional sensors are fixed, making it difficult to adapt to plum blossom contacts of different sizes. If plum blossom contacts of different specifications need to be monitored, the entire sensor often needs to be replaced, resulting in increased use costs and poor flexibility.

[0005] Therefore, a more optimized sensor installation structure needs to be considered. Summary of the Invention

[0006] The first object of the present invention is to provide a monitoring sensor with a plum blossom contact that can improve the current measurement accuracy of the monitoring sensor and ensure the stability of power supply.

[0007] The second object of the present invention is to provide a plum blossom contact assembly that can improve the current measurement accuracy of the monitoring sensor and ensure the stability of power supply.

[0008] A third object of the present invention is to provide a circuit breaker that can improve the current measurement accuracy of a monitoring sensor and ensure the stability of power supply.

[0009] In order to achieve the above-mentioned first purpose, the plum blossom contact monitoring sensor provided by the present invention is provided with an annular shell, and a central through hole is provided in the middle area of ​​the annular shell along the axial direction; the annular shell includes a first semi-annular shell and a second semi-annular shell, and the first semi-annular shell and the second semi-annular shell are connected by a telescopic structure, and the telescopic structure is used to adjust the area size of the central through hole; the first semi-annular shell is provided with a first circuit cavity, and the second semi-annular shell is provided with a second circuit cavity, and the first circuit cavity and the second circuit cavity cooperate to form a circuit cavity surrounding the central through hole; a circuit board is installed in the circuit cavity, and the circuit board is arranged around the central through hole; the circuit board located in the first circuit cavity is movably arranged in the first circuit cavity along the telescopic direction of the telescopic structure, and the circuit board located in the second circuit cavity is fixedly arranged; a magnetic ring is installed on the circuit board, and the magnetic ring is arranged around the central through hole; a coil is provided on at least a portion of the outer peripheral wall of the magnetic ring, and the coil is electrically connected to the circuit board.

[0010] As can be seen from the above scheme, in the present invention's contactor monitoring sensor, the annular housing, with its first and second circuit cavities forming a circuit cavity surrounding the central through-hole, has a circuit board and magnetic ring arranged circumferentially around the central through-hole. This allows the sensor to comprehensively monitor magnetic field or current changes around the contactor, avoiding localized blind spots and improving the integrity and accuracy of data acquisition. Furthermore, the enclosed magnetic ring design minimizes magnetic conduction losses, ensuring power draw at extremely low currents and ensuring stable power supply. Furthermore, the annular housing, consisting of a first and second half-ring housing connected by a telescopic structure, dynamically adjusts the diameter of the central through-hole according to the actual size of the contactor, allowing the sensor to accommodate contactors of varying specifications without requiring customization for specific models, significantly improving installation versatility. Furthermore, the circuit board within the first circuit cavity is movable along the telescopic structure, while the circuit board within the second circuit cavity is fixed. This allows the movable circuit board to adapt to housing expansion and contraction, while the fixed circuit board maintains the core circuit's position, preventing circuit connection failures due to mechanical displacement and ensuring circuit stability.

[0011] In a further solution, a first arc-shaped portion is provided on one side of the magnetic ring located in the first circuit cavity, and a second arc-shaped portion is provided on one side of the magnetic ring located in the second circuit cavity, and the first arc-shaped portion and the second arc-shaped portion are arranged concentrically; the magnetic ring is also provided with a first straight portion and a second straight portion, and the first end of the first arc-shaped portion is connected to the first end of the second arc-shaped portion through the first straight portion, and the second end of the first arc-shaped portion is connected to the second end of the second arc-shaped portion through the second straight portion.

[0012] It can be seen that the first arc-shaped portion and the second arc-shaped portion are concentrically arranged so that the center line of the magnetic circuit of the magnetic ring coincides with the central through hole (the axis of the plum blossom contact). When current flows through the plum blossom contact, the alternating magnetic field is evenly distributed along the concentric arc surface, and the magnetic ring can more efficiently gather magnetic flux, reduce leakage magnetic loss, and improve the stability of the coil induction signal. At the same time, the first straight portion and the second straight portion can maintain the shape of the magnetic ring stable when the annular shell moves in a telescopic manner, avoiding the magnetic circuit from being broken due to deformation. The concentric first arc-shaped portion and the second arc-shaped portion maintain the coaxiality of the magnetic ring and the plum blossom contact during the telescopic movement of the annular shell, maintaining the consistency of the magnetic field induction.

[0013] In a further scheme, the telescopic structure includes a connecting boss and a boss accommodating position, and the connecting boss can be telescopically adjusted and inserted into the boss accommodating position; the first semi-ring shell is provided with a first connecting end and a second connecting end, and the second semi-ring shell is provided with a third connecting end and a fourth connecting end; the first connecting end and the third connecting end are connected through a telescopic structure, one of the first connecting end and the third connecting end is provided with a connecting boss, and the other is provided with a boss accommodating position; the second connecting end and the fourth connecting end are connected through a telescopic structure, one of the second connecting end and the fourth connecting end is provided with a connecting boss, and the other is provided with a boss accommodating position.

[0014] It can be seen that the telescopic structure can dynamically adjust the combined inner diameter of the two semi-ring shells by setting the connecting boss and the boss accommodating position, ensuring that the sensor can tightly wrap contacts of different sizes, avoiding the problem of monitoring data deviation due to too loose size or unable to be installed due to too tight size.

[0015] In a further solution, a circuit through groove is provided on the connecting boss, and the first circuit cavity and the second circuit cavity are connected through the circuit through groove; the first straight portion and the second straight portion are located in the corresponding circuit through grooves.

[0016] It can be seen that the connecting boss is provided with a circuit through groove for connecting the first circuit cavity and the second circuit cavity, thereby preventing the first semi-ring shell and the second semi-ring shell from damaging the circuit during movement.

[0017] In a further solution, at least a portion of the circuit groove is a sealing section, and the sealing section is used to prevent the circuit groove from being exposed when the first semi-annular shell and the second semi-annular shell are in a stretched state.

[0018] Thus, the sealing section prevents the circuit trough from being exposed, effectively preventing rain, condensation, and dust from entering the trough, thereby preventing short circuits or corrosion of the wires. Furthermore, it prevents external high voltage from affecting the circuits in the trough.

[0019] In a further solution, the connecting boss is provided with a spring groove, and a compression spring is installed in the spring groove; the boss accommodating position is provided with a spring stopper, which can be movably inserted into the spring groove and is located near the first side of the spring groove; the first end of the compression spring abuts against the spring stopper, and the second end of the compression spring abuts against the second side of the spring groove.

[0020] As can be seen, by providing a compression spring with its first end abutting the spring stop and its second end abutting the second side of the spring slot, the compression spring provides a preload during sensor installation, automatically contracting the first and second half-ring housings and thereby clamping the contacts. This eliminates the need for manual knob adjustments or snaps, improving installation efficiency. Furthermore, during operation of electrical equipment, the contacts experience temperature fluctuations due to load changes, causing their outer diameter to expand or contract. The spring-type structure dynamically compensates for dimensional changes through elastic expansion and contraction, avoiding the loosening or overtightening problems associated with traditional rigid clamps caused by thermal expansion and contraction.

[0021] In a further solution, the first semi-annular shell and the second semi-annular shell are both provided with at least two inwardly buckled claws, and the claws are arranged along the outer circumference of the annular shell.

[0022] It can be seen that by providing an inward-facing clamp, the plum blossom contact can be clamped to facilitate installation.

[0023] In order to achieve the second purpose of the present invention, the present invention provides a plum blossom contact assembly, including a plum blossom contact and a plum blossom contact monitoring sensor, wherein the plum blossom contact monitoring sensor is mounted on the plum blossom contact; the plum blossom contact monitoring sensor adopts the above-mentioned plum blossom contact monitoring sensor.

[0024] In order to achieve the third object of the present invention, the present invention provides a circuit breaker, including a plum blossom contact assembly, and the plum blossom contact assembly adopts the above-mentioned plum blossom contact assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of an embodiment of the plum blossom contact assembly of the present invention.

[0026] Figure 2 It is a structural diagram of the plum blossom contact monitoring sensor in the embodiment of the plum blossom contact assembly of the present invention.

[0027] Figure 3 It is a structural exploded view of the plum blossom contact monitoring sensor in the embodiment of the plum blossom contact assembly of the present invention.

[0028] Figure 4 This is a structural diagram of the plum blossom contact monitoring sensor in the embodiment of the plum blossom contact assembly of the present invention after hiding the first bottom shell and the second bottom shell.

[0029] Figure 5It is a structural diagram of the first upper shell and the second upper shell of the plum blossom contact monitoring sensor in the retracted state in an embodiment of the plum blossom contact assembly of the present invention.

[0030] Figure 6 It is a structural diagram of the first upper shell and the second upper shell of the plum blossom contact monitoring sensor in the stretched state in the embodiment of the plum blossom contact assembly of the present invention.

[0031] Figure 7 It is a structural diagram of the plum blossom contact monitoring sensor in a stretched state in an embodiment of the plum blossom contact assembly of the present invention.

[0032] Figure 8 It is a diagram of the installation structure of the circuit board and the magnetic ring in the embodiment of the plum blossom contact assembly of the present invention.

[0033] Figure 9 It is a structural diagram of the magnetic ring in an embodiment of the plum blossom contact assembly of the present invention.

[0034] Figure 10 This is a structural diagram of the plum blossom contact monitoring sensor in the embodiment of the plum blossom contact assembly of the present invention after the first lower shell and the second lower shell are hidden in the stretched state.

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0036] Plum blossom contact assembly embodiment:

[0037] like Figure 1 As shown, in this embodiment, the plum blossom contact assembly includes a plum blossom contact 1 and a plum blossom contact monitoring sensor 2. The plum blossom contact 1 is provided with a plurality of plum blossom contact fingers 11, and the upper ends of the plum blossom contact fingers 11 are fitted with spring coils 12, which are used to tighten the plum blossom contact fingers 11. The specific structure of the plum blossom contact 1 is well known to those skilled in the art and will not be described in detail here. The plum blossom contact monitoring sensor 2 is installed at the upper end of the plum blossom contact 1 and is used to monitor the plum blossom contact 1 for temperature, partial discharge, pressure, tension, distance, etc. In this embodiment, the plum blossom contact monitoring sensor 2 is used to monitor the temperature and current signals of the plum blossom contact 1.

[0038] In this embodiment, see Figure 2 and Figure 3 The plum blossom contact monitoring sensor 2 is provided with an annular shell, which is made of high-temperature resistant insulating material. The annular shell is made of high-temperature resistant insulating material, which can meet the high-voltage insulation and explosion-proof requirements and avoid the risk of electrical accidents.

[0039] A central through hole 9 is provided in the middle area of ​​the annular shell and extends axially therethrough. The annular shell includes a first semi-annular shell 21 and a second semi-annular shell 22, which are connected by a telescopic structure. Both the first semi-annular shell 21 and the second semi-annular shell 22 are provided with at least two inwardly buckled claws 23, which are arranged along the outer circumference of the annular shell. The telescopic structure is used to adjust the size of the area enclosed by the claws 23 and the size of the central through hole 9. When the plum blossom contact monitoring sensor 2 is installed on the plum blossom contact 1, the claws 23 engage with the spring coil 12. Preferably, the claws 23 are formed by extending from the bottom of the annular shell, and the claws 23 are integrally formed with the annular shell, so that the claws 23 and the annular shell form a rigid whole, thereby preventing the claws 23 from falling off or deforming.

[0040] In this embodiment, the first semi-annular housing 21 includes a first upper housing 211 and a first bottom housing 212, which are detachable. The second semi-annular housing 22 includes a second upper housing 221 and a second bottom housing 222, which are detachable.

[0041] In this embodiment, the telescopic structure includes a connecting boss 24 and a boss receiving position 25. The connecting boss 24 is telescopically and adjustably inserted into the boss receiving position 25. By providing the connecting boss 24 and the boss receiving position 25, the telescopic structure can dynamically adjust the combined inner diameter of the two semi-annular shells, ensuring that the sensor can tightly wrap around contacts of different sizes, avoiding problems such as monitoring data deviation due to too loose a size or installation failure due to too tight a size.

[0042] The first semi-annular housing 21 is provided with a first connecting end 26 and a second connecting end 27, while the second semi-annular housing 22 is provided with a third connecting end 28 and a fourth connecting end 29. The first and third connecting ends 26 and 28 are connected by a telescopic structure. One of the first and third connecting ends 26 and 28 is provided with a connecting boss 24, and the other is provided with a boss receiving position 25. The second and fourth connecting ends 27 and 29 are connected by a telescopic structure. One of the second and fourth connecting ends 27 and 29 is provided with a connecting boss 24, and the other is provided with a boss receiving position 25. In this embodiment, the first and second connecting ends 26 and 27 are provided with boss receiving positions 25, while the third and fourth connecting ends 28 and 29 are provided with connecting bosses 24. The first and second semi-annular housings 21 and 22 are connected by a symmetrical double telescopic structure at both ends, forming a stable support frame. This prevents sensor deflection due to contact vibration or installation stress, and ensures that the two semi-annular housings maintain coaxial motion during opening and closing, preventing axial deviation.

[0043] In this embodiment, see Figure 4 、 Figure 5 and Figure 6The connecting boss 24 is provided with a spring slot 241, in which a compression spring 242 is mounted. The boss receiving portion 25 is provided with a spring stop 251, which is movably inserted into the spring slot 241 and located near the first side of the spring slot 241. The first end of the compression spring 242 abuts the spring stop 251, while the second end of the compression spring 242 abuts the second side of the spring slot 241. By providing the compression spring 242, with the first end abutting the spring stop 251 and the second end abutting the second side of the spring slot 241, during installation, the compression spring 242 provides a preload force, automatically contracting the first and second half-ring housings 21 and 22, thereby securing the contacts. This eliminates the need for manual adjustment knobs or latches, improving installation efficiency. Furthermore, during operation of electrical equipment, the contacts may expand or contract in diameter due to temperature fluctuations caused by load changes. The spring-loaded structure dynamically compensates for dimensional changes through elastic expansion and contraction, preventing traditional rigid clips from becoming loose or overtightened due to thermal expansion and contraction.

[0044] In this embodiment, the first semi-annular housing 21 is provided with a first circuit cavity 213, which is formed by the cooperation of the first upper housing 211 and the first bottom housing 212. The second semi-annular housing 22 is provided with a second circuit cavity 223, which is formed by the cooperation of the second upper housing 221 and the second bottom housing 222. The first circuit cavity 213 and the second circuit cavity 223 cooperate to form a circuit cavity surrounding the central through hole 9. The connecting boss 24 is provided with a circuit groove 243, through which the first circuit cavity 213 and the second circuit cavity 223 are connected. By providing the circuit groove 243, the connecting boss 24 is used to connect the first circuit cavity 213 and the second circuit cavity 223, thereby preventing damage to the circuit during movement of the first and second semi-annular housings 21 and 22. The first circuit cavity 213 and the second circuit cavity 223 cooperate to form a circuit cavity for accommodating the circuit board 4. A magnetic ring 5 and a coil (not shown) for drawing power are also provided in the circuit cavity. By inductively drawing power through the magnetic ring 5 and the coil, a passive setting of the sensor can be realized, which is convenient for installation.

[0045] In this embodiment, see Figure 7 At least a portion of circuit channel 243 is sealed with a sealing section 2431. This section prevents exposure of circuit channel 243 when the first and second semi-annular housings 21 and 22 are in the extended state. This sealing section prevents exposure of circuit channel 243, effectively blocking rain, condensation, and dust from entering circuit channel 243, preventing short circuits or corrosion of the wires. Furthermore, it prevents external high voltage from affecting the circuitry within circuit channel 243.

[0046] Depend on Figure 4It can be seen that a circuit board 4 is installed in the circuit cavity, and the circuit board 4 is arranged around the central through hole 9. The circuit board 4 located in the first circuit cavity 213 is movably arranged in the first circuit cavity 213 along the extension direction of the telescopic structure, and the circuit board 4 located in the second circuit cavity 223 is fixed. In this embodiment, two limiting grooves 41 are provided on the circuit board 4 located in the second circuit cavity 223, and two limiting posts 7 are provided in the second circuit cavity 223. The limiting posts 7 cooperate with the limiting grooves 41 to limit the position of the circuit board 4, so that the circuit board 4 is fixed in the second circuit cavity 223. The circuit board 4 located in the first circuit cavity 213 can move along the direction of the telescopic structure, and the circuit board 4 in the second circuit cavity 223 is fixed. It can adapt to the extension and contraction of the shell through the movable circuit board 4, and can also keep the position of the core circuit stable through the fixed circuit board 4, thereby avoiding circuit connection failure due to mechanical displacement and ensuring the stability of the circuit.

[0047] See also Figure 8 A magnetic ring 5 is mounted on the circuit board 4 and is arranged around the central through hole 9. A coil (not shown) is provided on at least a portion of the outer peripheral wall of the magnetic ring 5. The coil is electrically connected to the circuit board 4. By providing the coil and the magnetic ring 5, the magnetic field of the plum blossom contact 1 can be sensed and converted into an electrical signal for providing power to the circuit board 4. At the same time, the current can be detected by the circuit in the circuit board 4 to determine whether the current of the plum blossom contact is normal. The technology for inductively drawing power through the magnetic ring 5 and the coil is well known to those skilled in the art and will not be described in detail here.

[0048] See also Figure 9 A first arc-shaped portion 51 is provided on one side of the magnetic ring 5 located in the first circuit cavity 213, and a second arc-shaped portion 52 is provided on one side of the magnetic ring 5 located in the second circuit cavity 223. The first arc-shaped portion 51 and the second arc-shaped portion 52 are concentrically arranged, that is, the first arc-shaped portion 51 and the second arc-shaped portion 52 have the same center A. In this embodiment, the coil is arranged on the second arc-shaped portion 52. The first arc-shaped portion 51 and the second arc-shaped portion 52 are concentrically arranged so that the center line of the magnetic circuit of the magnetic ring 5 coincides with the axis of the central through hole 9. When the plum blossom contact is flowing, the alternating magnetic field is evenly distributed along the concentric arc surface, and the magnetic ring 5 can more efficiently gather magnetic flux, reduce leakage magnetic loss, and improve the stability of the coil induction signal.

[0049] The magnetic ring 5 is further provided with a first straight portion 53 and a second straight portion 54. The first end of the first curved portion 51 is connected to the first end of the second curved portion 52 via the first straight portion 53, and the second end of the first curved portion 51 is connected to the second end of the second curved portion 52 via the second straight portion 54. The first straight portion 53 and the second straight portion 54 are located within the corresponding circuit grooves 243. The first straight portion 53 and the second straight portion 54 maintain the shape of the magnetic ring 5 stable during the expansion and contraction of the annular housing, preventing the magnetic circuit from being broken due to deformation. The concentric first curved portion 51 and the second curved portion 52 ensure the coaxiality of the magnetic ring 5 and the plum blossom contact during the expansion and contraction of the annular housing, maintaining the consistency of the magnetic field induction.

[0050] In this embodiment, when the first half-ring shell 21 and the second half-ring shell 22 are in the contracted state, Figure 4 As shown, the magnetic ring 5 is located in the first circuit cavity 213 on the side away from the central through hole 9. When the first half ring shell 21 and the second half ring shell 22 are in the stretched state, as shown in FIG. Figure 10 As shown, the magnetic ring 5 is located in the first circuit cavity 213 on one side close to the central through hole 9 .

[0051] In addition, in this embodiment, the plum blossom contact monitoring sensor is further provided with a temperature probe 6 , which is exposed outside the annular housing and located at the bottom of the annular housing. The temperature probe 6 is used to monitor the temperature of the plum blossom contact fingers 11 .

[0052] When installing the plum blossom contact monitoring sensor of this embodiment, first, manually pull apart the first half-ring shell 21 and the second half-ring shell 22, so that the first half-ring shell 21 and the second half-ring shell 22 are in a stretched state. Figure 7 Next, clamp the plum blossom contact monitoring sensor on the top of the plum blossom contact 1, and make the temperature probe 6 abut the top of any group of plum blossom contact fingers 11, then release the tension of your hand to make the clamping claw 23 engage with the spring coil 12, thus completing the installation.

[0053] As can be seen from the above, in the plum blossom contact monitoring sensor of the present invention, the annular shell cooperates with the first circuit cavity 213 and the second circuit cavity 223 to form a circuit cavity surrounding the central through hole 9, and the circuit board 4 and the magnetic ring 5 are arranged around the circumference of the central through hole 9, so that the sensor can monitor the magnetic field or current changes around the plum blossom contact in all directions, avoid local monitoring blind spots, and improve the integrity and accuracy of data collection. Moreover, the closed design of the magnetic ring 5 can ensure the lowest magnetic conductivity loss, ensure that it can draw power under extremely low current conditions, and ensure the stability of power drawing. At the same time, the annular shell is connected by a telescopic structure composed of a first semi-annular shell 21 and a second semi-annular shell 22, and the diameter of the central through hole 9 can be dynamically adjusted according to the actual size of the plum blossom contact 1, so that the sensor can adapt to plum blossom contacts 1 of different specifications without the need for customization for specific models, which significantly improves the installation versatility.

[0054] Circuit breaker example:

[0055] In this embodiment, the circuit breaker includes a plum blossom contact assembly, and the plum blossom contact assembly adopts the plum blossom contact assembly of the above embodiment.

[0056] It should be noted that the above are only preferred embodiments of the present invention, but the design concept of the invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept also fall within the scope of protection of the present invention.

Claims

1. A plum blossom contact monitoring sensor, provided with an annular shell, wherein the middle area of ​​the annular shell is provided with a central through hole extending axially therethrough, characterized in that: The annular shell includes a first semi-annular shell and a second semi-annular shell, wherein the first semi-annular shell and the second semi-annular shell are connected by a telescopic structure, and the telescopic structure is used to adjust the area size of the central through hole; The first semi-ring housing is provided with a first circuit cavity, and the second semi-ring housing is provided with a second circuit cavity, and the first circuit cavity and the second circuit cavity cooperate to form a circuit cavity surrounding the central through hole; A circuit board is installed in the circuit cavity, and the circuit board is arranged around the central through hole; The circuit board located in the first circuit cavity is movably arranged in the first circuit cavity along the telescopic direction of the telescopic structure, and the circuit board located in the second circuit cavity is fixedly arranged; A magnetic ring is mounted on the circuit board, and the magnetic ring is arranged around the central through hole; A coil is provided on at least a portion of the outer peripheral wall of the magnetic ring, and the coil is electrically connected to the circuit board.

2. The plum blossom contact monitoring sensor according to claim 1, characterized in that: A first arc-shaped portion is provided on one side of the magnetic ring located in the first circuit cavity, and a second arc-shaped portion is provided on one side of the magnetic ring located in the second circuit cavity, wherein the first arc-shaped portion and the second arc-shaped portion are concentrically arranged; The magnetic ring is further provided with a first straight portion and a second straight portion, the first end of the first arcuate portion is connected to the first end of the second arcuate portion through the first straight portion, and the second end of the first arcuate portion is connected to the second end of the second arcuate portion through the second straight portion.

3. The plum blossom contact monitoring sensor according to claim 2, characterized in that: The telescopic structure includes a connecting boss and a boss receiving position, and the connecting boss is telescopically and adjustably inserted into the boss receiving position; The first half-ring shell is provided with a first connecting end and a second connecting end, and the second half-ring shell is provided with a third connecting end and a fourth connecting end; The first connecting end and the third connecting end are connected via the telescopic structure, one of the first connecting end and the third connecting end is provided with the connecting boss, and the other is provided with the boss receiving position; The second connecting end and the fourth connecting end are connected via the telescopic structure. One of the second connecting end and the fourth connecting end is provided with the connecting boss, and the other is provided with the boss receiving position.

4. The plum blossom contact monitoring sensor according to claim 3, characterized in that: The connecting boss is provided with a circuit through groove, and the first circuit cavity and the second circuit cavity are connected through the circuit through groove; The first straight portion and the second straight portion are located in the corresponding circuit through grooves.

5. The plum blossom contact monitoring sensor according to claim 4, characterized in that: At least a portion of the circuit through groove is a sealing section, and the sealing section is used to prevent the circuit through groove from being exposed when the first semi-annular shell and the second semi-annular shell are in a stretched state.

6. The plum blossom contact monitoring sensor according to claim 3, characterized in that: The connecting boss is provided with a spring groove, and the spring groove is installed with a compression spring; The boss receiving position is provided with a spring stopper, which can be movably inserted into the spring slot and is located near the first side of the spring slot; The first end of the compression spring abuts against the spring stopper, and the second end of the compression spring abuts against the second side of the spring slot.

7. The plum blossom contact monitoring sensor according to any one of claims 1 to 6, characterized in that: The first semi-annular shell and the second semi-annular shell are both provided with at least two inwardly buckled grips, and the grips are arranged along the outer circumference of the annular shell.

8. A plum blossom contact assembly, comprising a plum blossom contact and a plum blossom contact monitoring sensor, wherein the plum blossom contact monitoring sensor is mounted on the plum blossom contact; characterized in that: The plum blossom contact monitoring sensor adopts the plum blossom contact monitoring sensor according to any one of claims 1 to 7.

9. A circuit breaker comprising a plum blossom contact assembly, characterized in that: The plum blossom contact assembly adopts the plum blossom contact assembly described in claim 8.

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