Plunger contact monitoring sensor, plunger contact assembly, and circuit breaker

Abstract

The utility model provides a kind of plum blossom contact monitoring sensor, plum blossom contact assembly and circuit breaker, the plum blossom contact monitoring sensor is provided with annular shell, annular shell includes first half ring shell and second half ring shell, first half ring shell and second half ring shell are connected by telescopic structure, telescopic structure is used to adjust the area size of center through-hole;Circuit cavity is equipped with circuit board, and circuit board is arranged around center through-hole;The circuit board in first circuit cavity is movably arranged in first circuit cavity along the telescopic direction of telescopic structure, and the circuit board in second circuit cavity is fixedly arranged;Magnetic ring is installed on circuit board, and magnetic ring is arranged around center through-hole;At least a part of the outer wall of magnetic ring is provided with coil, and coil is electrically connected with circuit board.The plum blossom contact monitoring sensor of the utility model can improve the current measurement accuracy of monitoring sensor and ensure the power stability.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, specifically 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 Technology

[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 one such focus. The healthy operating status of high-voltage switchgear is mainly reflected in the contact points between the stylus contacts and stationary contacts of the circuit breaker. Wear and aging during insertion and removal often lead to poor contact, or overload current can cause rapid heating of the connecting parts, resulting in spontaneous combustion and explosion, causing significant economic losses. Therefore, monitoring the operating status of the stylus contacts of circuit breakers using sensors is a common method.

[0003] Existing plum blossom contact sensors typically include a magnetic ring, a coil, and a circuit board. The magnetic ring is used to sense 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 to be collected, processed, and transmitted by the circuits on the circuit board.

[0004] Traditional magnetic ring and circuit board layouts have several technical drawbacks. Firstly, most sensors employ a single-sided or partial magnetic ring arrangement, meaning the magnetic field of the L-shaped contact can only partially pass through the ring. This results in incomplete electrical signals induced by the ring, leading to distorted and inaccurate monitoring data. For instance, a single-sided magnetic ring cannot uniformly collect the annular magnetic field around the cable, making it susceptible to interference from ambient magnetic fields and unable to accurately reflect the actual current value. Secondly, the fixed magnetic ring and circuit board structure of traditional sensors makes it difficult to adapt to different sizes of L-shaped contacts. Monitoring different specifications of L-shaped contacts often requires replacing the entire sensor, increasing operating costs and reducing flexibility.

[0005] Therefore, a more optimized sensor mounting structure needs to be considered. Utility Model Content

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

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

[0008] The third objective of this invention is to provide a circuit breaker that can improve the accuracy of current measurement by monitoring sensors and ensure power supply stability.

[0009] To achieve the aforementioned first objective, the plum blossom contact monitoring sensor provided by this utility model is provided with an annular housing, and a central through hole extending axially is provided in the middle region of the annular housing; the annular housing includes a first semi-annular housing and a second semi-annular housing, which are connected by a telescopic structure for adjusting the size of the central through hole area; the first semi-annular housing is provided with a first circuit cavity, and the second semi-annular housing is provided with a second circuit cavity, which 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 movable 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 plum blossom contact monitoring sensor of this utility model, the annular shell forms a circuit cavity surrounding the central through hole through the cooperation of the first circuit cavity and the second circuit cavity. The circuit board and the magnetic ring are arranged around the circumference of the central through hole, which allows the sensor to monitor the magnetic field or current changes around the plum blossom contact from all directions, avoiding local monitoring blind spots and improving the integrity and accuracy of data acquisition. Moreover, the closed design of the magnetic ring can ensure the lowest magnetic conduction loss, ensuring that it can draw power under extremely low current conditions and ensuring power supply stability. At the same time, the annular shell is connected by the first half-ring shell and the second half-ring shell through a telescopic structure, which can dynamically adjust the diameter of the central through hole according to the actual size of the plum blossom contact, so that the sensor can be adapted to plum blossom contacts of different specifications without the need for separate customization for specific models, which significantly improves the versatility of installation. Meanwhile, the circuit board located in the first circuit cavity can move along the telescopic structure, while the circuit board in the second circuit cavity is fixedly set. It can adapt to the expansion and contraction of the shell by moving the circuit board, and it can keep the position of the core circuit stable by fixing the circuit board, avoiding circuit connection failure due to mechanical displacement and ensuring circuit stability.

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

[0012] Therefore, the first and second arc-shaped portions are concentrically arranged, aligning the center line of the magnetic circuit of the magnetic ring with the central through-hole (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 surfaces, allowing the magnetic ring to more efficiently concentrate magnetic flux, reduce leakage magnetic loss, and improve the stability of the coil's induced signal. Simultaneously, the first and second straight portions maintain the shape stability of the magnetic ring during the expansion and contraction of the annular shell, preventing magnetic circuit breakage due to deformation. The concentric first and second arc-shaped portions also ensure the coaxiality of the magnetic ring and the plum blossom contact during the expansion and contraction of the annular shell, maintaining the consistency of the magnetic field induction.

[0013] In a further embodiment, the telescopic structure includes a connecting boss and a boss receiving position, the connecting boss being telescopically adjustable and inserted into the boss receiving position; the first semi-annular housing is provided with a first connecting end and a second connecting end, and the second semi-annular housing is provided with a third connecting end and a fourth connecting end; the first connecting end and the third connecting end are connected by 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 receiving position; the second connecting end and the fourth connecting end are connected by 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 receiving position.

[0014] As can be seen, the telescopic structure, through the combination of connecting bosses and boss receiving positions, can dynamically adjust the combined inner diameter of the two semi-ring shells, ensuring that the sensor can tightly wrap the contacts of different sizes, avoiding problems such as monitoring data deviation due to excessively loose dimensions or installation failure due to excessively tight dimensions.

[0015] In a further embodiment, a circuit through slot is provided on the connecting boss, and the first circuit cavity and the second circuit cavity are connected through the circuit through slot; the first straight part and the second straight part are located in the corresponding circuit through slot.

[0016] Therefore, it can be seen that by setting a circuit through groove, the connecting boss is used to connect the first circuit cavity and the second circuit cavity, which can prevent the first half-ring shell and the second half-ring shell from damaging the circuit during movement.

[0017] In a further embodiment, at least a portion of the circuit through-slot is a sealed section, which is used to prevent the circuit through-slot from being exposed when the first semi-ring housing and the second semi-ring housing are in a stretched state.

[0018] Therefore, by incorporating a sealed section, the circuit channel can be prevented from being exposed, effectively blocking rainwater, condensation, and dust from entering the circuit channel and preventing short circuits or corrosion of the wires. Simultaneously, it prevents external high-voltage electricity from affecting the circuitry within the circuit channel.

[0019] In a further embodiment, the connecting boss is provided with a spring groove, and a compression spring is installed in the spring groove; a spring stop is provided at the boss receiving position, and the spring stop can be movably inserted into the spring groove and is located on the first side close to the spring groove; the first end of the compression spring abuts against the spring stop, and the second end of the compression spring abuts against the second side of the spring groove.

[0020] Therefore, by setting a compression spring, with its first end abutting against the spring stop and its second end abutting against the second side of the spring groove, the sensor installation process is facilitated. The compression spring provides pre-tension, automatically causing the first and second semi-ring housings to contract and secure the contacts, eliminating the need for manual adjustment of knobs or clips and improving installation efficiency. Furthermore, during power equipment operation, the contacts experience temperature fluctuations due to load changes, causing the outer diameter to expand or contract. The spring-type structure dynamically compensates for these dimensional changes through elastic expansion and contraction, avoiding the loosening or over-tightening problems caused by thermal expansion and contraction inherent in traditional rigid clamps.

[0021] In a further embodiment, both the first and second semi-annular shells are provided with at least two inwardly snapping catches, which are arranged along the outer periphery of the annular shells.

[0022] Therefore, it can be seen that by setting an inward-facing clamp, it can be used to lock the sprite contact, making installation easier.

[0023] To achieve the second objective of this utility model, this utility model 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 installed on the plum blossom contact; the plum blossom contact monitoring sensor adopts the aforementioned plum blossom contact monitoring sensor.

[0024] To achieve the third objective of this utility model, this utility model provides a circuit breaker, including a plum blossom contact assembly, wherein the plum blossom contact assembly adopts the above-mentioned plum blossom contact assembly. Attached Figure Description

[0025] Figure 1 This is a structural diagram of an embodiment of the plum blossom contact assembly of this utility model.

[0026] Figure 2 This is a structural diagram of the plum blossom contact monitoring sensor in an embodiment of the plum blossom contact assembly of this utility model.

[0027] Figure 3 This is an exploded view of the structure of the plum blossom contact monitoring sensor in an embodiment of the plum blossom contact assembly of this utility model.

[0028] Figure 4 This is a structural diagram of the plum blossom contact monitoring sensor after the first and second bottom shells are hidden in an embodiment of the plum blossom contact assembly of this utility model.

[0029] Figure 5This 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 this utility model.

[0030] Figure 6 This is a structural diagram of the first upper shell and the second upper shell of the plum blossom contact monitoring sensor in a stretched state in an embodiment of the plum blossom contact assembly of this utility model.

[0031] Figure 7 This 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 this utility model.

[0032] Figure 8 This is a diagram showing the installation structure of the circuit board and magnetic ring in an embodiment of the plum blossom contact assembly of this utility model.

[0033] Figure 9 This is a structural diagram of the magnetic ring in an embodiment of the plum blossom contact assembly of this utility model.

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

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

[0036] Example of a plum blossom contact assembly:

[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 multiple plum blossom contact fingers 11, and a spring coil 12 is fitted onto the upper end of each plum blossom contact finger 11. The spring coil 12 is used to tighten the plum blossom contact fingers 11. The specific structure of the plum blossom contact 1 is a structure 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 measurement, partial discharge, pressure, tension, distance measurement, 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 equipped with an annular housing, which is made of high-temperature resistant insulating material. This annular housing can meet the requirements of high-voltage insulation and explosion-proof, and avoid the risk of electrical accidents.

[0039] A central through hole 9 extending axially is provided in the central region of the annular housing. The annular housing includes a first semi-annular housing 21 and a second semi-annular housing 22, which are connected by a telescopic structure. Both the first semi-annular housing 21 and the second semi-annular housing 22 are provided with at least two inwardly engaged latches 23, which are arranged along the outer periphery of the annular housing. The telescopic structure is used to adjust the size of the area enclosed by the latches 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 latches 23 engage with the spring coil 12. Preferably, the latches 23 extend from the bottom of the annular housing and are integrally formed with the annular housing, so that the latches 23 and the annular housing form a rigid whole, preventing the latches 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 detachably installed. The second semi-annular housing 22 includes a second upper housing 221 and a second bottom housing 222, which are also detachably installed.

[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 adjustablely inserted into the boss receiving position 25. The telescopic structure, through the cooperation of the connecting boss 24 and the boss receiving position 25, can dynamically adjust the combined inner diameter of the two semi-annular housings, ensuring that the sensor can tightly wrap around contacts of different sizes, avoiding problems such as monitoring data deviation due to excessive looseness or installation failure due to excessive tightness.

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

[0043] In this embodiment, see Figure 4 , Figure 5 and Figure 6The connecting boss 24 is provided with a spring groove 241, and a compression spring 242 is installed in the spring groove 241. The boss receiving position 25 is provided with a spring stop 251, which is movably inserted into the spring groove 241 and located on the first side near the spring groove 241. The first end of the compression spring 242 abuts against the spring stop 251, and the second end of the compression spring 242 abuts against the second side of the spring groove 241. By providing the compression spring 242, with its first end abutting against the spring stop 251 and its second end abutting against the second side of the spring groove 241, it is convenient to use the preload provided by the compression spring 242 during installation to automatically contract the first half-ring housing 21 and the second half-ring housing 22, thereby locking the contacts. This eliminates the need for manual adjustment of knobs or clips, improving installation efficiency. Simultaneously, during the operation of the power equipment, the contacts experience temperature fluctuations due to load changes, causing the outer diameter to expand or contract accordingly. The spring-type structure dynamically compensates for dimensional changes through elastic expansion and contraction, avoiding the loosening or over-tightening problems caused by thermal expansion and contraction of traditional rigid clamps.

[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 a first upper housing 211 and a 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 a second upper housing 221 and a 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 through groove 243, through which the first circuit cavity 213 and the second circuit cavity 223 are connected. By providing the circuit through groove 243, the connecting boss 24 can connect the first circuit cavity 213 and the second circuit cavity 223, thus preventing damage to the circuit when the first semi-annular housing 21 and the second semi-annular housing 22 move. 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 power extraction are also provided in the circuit cavity. Power is extracted by induction through the magnetic ring 5 and the coil, which can realize the passive setting of the sensor and facilitate installation.

[0045] In this embodiment, see Figure 7 At least a portion of the circuit channel 243 is a sealed section 2431. The sealed section 2431 is used to prevent the circuit channel 243 from being exposed when the first semi-annular housing 21 and the second semi-annular housing 22 are in a stretched state. By providing the sealed section 2431, the circuit channel 243 can be prevented from being exposed, effectively blocking rainwater, condensation, and dust from entering the circuit channel 243, and preventing short circuits or corrosion of the wires. At the same time, it prevents external high-voltage electricity from affecting the circuit in the circuit channel 243.

[0046] Depend on Figure 4It is known that a circuit board 4 is installed inside 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 movable in the first circuit cavity 213 along the telescopic direction of the telescopic structure, while the circuit board 4 located in the second circuit cavity 223 is fixedly installed. In this embodiment, the circuit board 4 located in the second circuit cavity 223 is provided with two limiting grooves 41, and the second circuit cavity 223 is provided with two limiting posts 7. The limiting posts 7 are engaged with the limiting grooves 41 to limit and fix the circuit board 4 in the second circuit cavity 223. The circuit board 4 located in the first circuit cavity 213 can move along the telescopic direction, while the circuit board 4 located in the second circuit cavity 223 is fixedly installed. This arrangement allows the movable circuit board 4 to adapt to the telescopic movement of the shell, while the fixed circuit board 4 maintains the stability of the core circuit, avoiding circuit connection failure due to mechanical displacement and ensuring circuit stability.

[0047] See Figure 8 A magnetic ring 5 is mounted on the circuit board 4, surrounding the central through hole 9. At least a portion of the outer peripheral wall of the magnetic ring 5 is provided with a coil (not shown), which is electrically connected to the circuit board 4. By setting the coil and the magnetic ring 5, the magnetic field of the sprite contact 1 can be sensed and converted into an electrical signal, used to provide power to the circuit board 4. Simultaneously, the circuitry in the circuit board 4 can detect the current to determine whether the current in the sprite contact is normal. The technology of using the magnetic ring 5 and the coil for inductive power extraction is well-known to those skilled in the art and will not be described in detail here.

[0048] See Figure 9 The magnetic ring 5 has a first arc-shaped portion 51 on one side within the first circuit cavity 213 and a second arc-shaped portion 52 on one side within the second circuit cavity 223. The first arc-shaped portion 51 and the second arc-shaped portion 52 are concentrically arranged, meaning they share the same center A. In this embodiment, the coil is disposed on the second arc-shaped portion 52. The concentric arrangement of the first arc-shaped portion 51 and the second arc-shaped portion 52 ensures that the magnetic circuit centerline of the magnetic ring 5 coincides with the axis of the central through hole 9. When current flows through the plum blossom contact, the alternating magnetic field is uniformly distributed along the concentric arc surface, allowing the magnetic ring 5 to more efficiently concentrate magnetic flux, reduce leakage magnetic loss, and improve the stability of the coil induction signal.

[0049] The magnetic ring 5 is also provided with a first straight section 53 and a second straight section 54. The first end of the first arc-shaped section 51 is connected to the first end of the second arc-shaped section 52 through the first straight section 53, and the second end of the first arc-shaped section 51 is connected to the second end of the second arc-shaped section 52 through the second straight section 54. The first straight section 53 and the second straight section 54 are located in corresponding circuit slots 243. The first straight section 53 and the second straight section 54 can maintain the shape stability of the magnetic ring 5 during the telescopic movement of the annular shell, avoiding magnetic circuit breakage due to deformation. The concentric first arc-shaped section 51 and the second arc-shaped section 52 maintain the coaxiality of the magnetic ring 5 and the plum blossom contact during the telescopic movement of the annular shell, thus maintaining the consistency of magnetic field induction.

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

[0051] In addition, in this embodiment, the plum blossom contact monitoring sensor is also equipped 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 11.

[0052] In this embodiment, when installing the plum blossom contact monitoring sensor, firstly, manually pull apart the first semi-ring housing 21 and the second semi-ring housing 22 to put the first semi-ring housing 21 and the second semi-ring housing 22 in a stretched state, such as... Figure 7 The state shown is as follows. Next, the sprite contact monitoring sensor is clipped onto the top of the sprite contact 1, and the temperature probe 6 is brought into contact with the top of any set of sprite contact fingers 11. Then, the pulling force is released, so that the clamp 23 engages with the spring ring 12, thereby completing the installation.

[0053] As described above, in the plum blossom contact monitoring sensor of this utility model, the annular housing forms a circuit cavity surrounding the central through hole 9 through the cooperation of the first circuit cavity 213 and the second circuit cavity 223. The circuit board 4 and the magnetic ring 5 are arranged around the circumference of the central through hole 9, which enables the sensor to monitor the magnetic field or current changes around the plum blossom contact from all directions, avoiding local monitoring blind spots and improving the integrity and accuracy of data acquisition. Moreover, the closed design of the magnetic ring 5 ensures the lowest magnetic conduction loss, ensuring that it draws power under extremely low current conditions and ensuring power supply stability. At the same time, the annular housing is connected by the first half-annular housing 21 and the second half-annular housing 22 through a telescopic structure, which can dynamically adjust the diameter of the central through hole 9 according to the actual size of the plum blossom contact 1, so that the sensor can be adapted to plum blossom contacts 1 of different specifications without the need for separate customization for specific models, which significantly improves the versatility of installation.

[0054] Circuit breaker example:

[0055] In this embodiment, the circuit breaker includes a plum blossom contact assembly, which adopts the plum blossom contact assembly described in the above embodiment.

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

Claims

1. A plum blossom contact monitoring sensor, comprising an annular housing, wherein a central through hole extending axially is provided in the central region of the annular housing, characterized in that, The annular shell includes a first semi-annular shell and a second semi-annular shell, which are connected by a telescopic structure. The telescopic structure is used to adjust the size of the area of ​​the central through hole. The first semi-annular housing is provided with a first circuit cavity, and the second semi-annular housing is provided with a second circuit cavity. 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 inside 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 disposed within the first circuit cavity along the telescopic direction of the telescopic structure, while the circuit board located in the second circuit cavity is fixedly disposed. A magnetic ring is mounted on the circuit board, and the magnetic ring is arranged around the central through hole; At least a portion of the outer peripheral wall of the magnetic ring is provided with a coil, and the coil is electrically connected to the circuit board.

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

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, wherein the connecting boss is telescopically and adjustablely inserted into the boss receiving position. The first semi-ring housing is provided with a first connecting end and a second connecting end, and the second semi-ring housing is provided with a third connecting end and a fourth connecting end; The first connecting end and the third connecting end are connected by a 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 by 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 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 slot, and the first circuit cavity and the second circuit cavity are connected through the circuit through slot. The first straight section and the second straight section are located in the corresponding circuit through slots.

5. The plum blossom contact monitoring sensor according to claim 4, characterized in that: At least a portion of the circuit through-slot is a sealed section, which is used to prevent the circuit through-slot from being exposed when the first semi-annular housing and the second semi-annular housing 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 a compression spring is installed in the spring groove; The boss receiving position is provided with a spring stop block, which can be movably inserted into the spring groove and is located on the first side close to the spring groove. The first end of the compression spring abuts against the spring stop, and the second end of the compression spring abuts against the second side of the spring groove.

7. The plum blossom contact monitoring sensor according to any one of claims 1 to 6, characterized in that: Both the first semi-annular shell and the second semi-annular shell are provided with at least two inwardly snapping catches, which are arranged along the outer periphery 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 is the plum blossom contact monitoring sensor according to any one of claims 1 to 7.

9. A circuit breaker, comprising a sprite-shaped contact assembly, characterized in that: The plum blossom contact assembly is the plum blossom contact assembly as described in claim 8.

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