A stroke on-line monitoring device for vacuum circuit breaker

Abstract

The application discloses a kind of stroke on-line monitoring device of vacuum circuit breaker, including data collector, opening current sensor, closing current sensor and self-adapting angle displacement sensor;The data collector is used for data acquisition, analysis and processing;The opening current sensor is used to induct the operating current of the opening process of vacuum circuit breaker, and the closing current sensor is used to induct the operating current of the closing process of vacuum circuit breaker;The sensor of the angle inductor is used for the displacement monitoring of vacuum circuit breaker.The application adopts non-contact angle displacement sensor, avoids the eccentric problem of main shaft, angle displacement inductor is fixed on rotating main shaft, angle displacement resolver is fixed on fixed structural member not in contact with rotating main shaft, and they are not in contact with each other, the eccentricity of rotating main shaft cannot cause damage to non-contact angle displacement sensor, and realizes the real-time, reliable monitoring of vacuum circuit breaker displacement.

Description

Technical Field

[0001] This invention relates to the field of power technology, and in particular to an online monitoring device for the travel of a vacuum circuit breaker. Background Technology

[0002] The core component of armored switchgear is the vacuum circuit breaker.

[0003] Vacuum circuit breakers are responsible for the critical high-voltage power control functions of switchgear. Key mechanical characteristic parameters of the vacuum circuit breaker's opening and closing process, such as speed, opening distance, and overtravel, directly reflect the equipment status of the circuit breaker and are the core of online monitoring. Obtaining these parameters requires online monitoring of the circuit breaker's opening and closing stroke; therefore, online monitoring of the stroke is crucial for the online monitoring of the mechanical characteristics of vacuum circuit breakers.

[0004] The closing process of a vacuum circuit breaker is as follows: Pressing the closing control key (or turning on the power supply to the closing electromagnet) transmits the signal to the energy storage holding stop via the linkage mechanism. The energy storage holding stop rotates, disengaging from the cam mechanism. The closing spring releases energy, driving the four-bar linkage mechanism to move. The four-bar linkage mechanism drives the rotating main shaft to rotate, which in turn drives the insulating pull rod to move. The insulating pull rod pushes the moving contact upward, engaging with the stationary contact, thus completing the closing action. Similarly, the opening process is similar to the closing process, except that the steps and rotation direction are reversed. Ultimately, the rotating main shaft rotates in the opposite direction, driving the insulating pull rod to move in the opposite direction. The insulating pull rod pushes the moving contact downward, causing the moving contact to separate from the stationary contact, thus completing the opening action.

[0005] Theoretically, the opening and closing stroke of a vacuum circuit breaker can be obtained by monitoring any one of the four-bar linkage, the rotating spindle, or the insulating tie rod. However, since the four-bar linkage and the insulating tie rod are usually inside the circuit breaker, stroke sensors cannot be installed after the vacuum circuit breaker is assembled. Therefore, the best object for monitoring the stroke of a vacuum circuit breaker is the rotating spindle. At the same time, the movement trajectory of the rotating spindle is circular, and the opening and closing stroke curve of the handcart-type vacuum circuit breaker can be easily obtained through a rotary stroke sensor.

[0006] During the opening and closing process of a vacuum circuit breaker, the movement trajectory of the rotating spindle is not a standard arc, but rather involves jitter and eccentricity. Conventional contact-type travel sensors are easily damaged and are not suitable for monitoring the travel of vibrating circuit breakers.

[0007] Rotary encoders can monitor circular motion, but conventional integrated rotary encoders are large and difficult to install inside vacuum circuit breakers. In addition, due to the eccentricity of the rotation of vacuum circuit breakers, the spindle of conventional integrated rotary encoders cannot adapt to this eccentricity and is easily damaged. Tests have shown that conventional integrated encoders, when forcibly installed on the rotating spindle of vacuum circuit breakers, have a service life of no more than 200 cycles, which cannot meet the machine life design requirement of 16,000 cycles for vacuum circuit breakers.

[0008] Therefore, those skilled in the art are dedicated to developing an online travel monitoring device for vacuum circuit breakers to solve the problems of excessively large sensor size, difficult installation, and inability to adapt to the eccentricity of the rotating spindle. Summary of the Invention

[0009] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is how to design an online travel monitoring device for a vacuum circuit breaker to solve the problems of excessively large sensor size, difficult installation, and inability to adapt to the eccentricity of the rotating spindle.

[0010] To achieve the above objectives, the present invention provides an online travel monitoring device for a vacuum circuit breaker, characterized in that it includes a data acquisition unit, a tripping current sensor, a closing current sensor, and an adaptive angle displacement sensor.

[0011] The data acquisition device is used for data acquisition, analysis, and processing;

[0012] The tripping current sensor is used to sense the operating current during the tripping process of the vacuum circuit breaker, determine the energizing time of the tripping coil, and simultaneously start sampling of the tripping stroke.

[0013] The closing current sensor is used to sense the operating current during the closing process of the vacuum circuit breaker, determine the energizing time of the closing coil, and simultaneously start sampling of the closing stroke.

[0014] The angle sensor is used to monitor the displacement of the vacuum circuit breaker.

[0015] Furthermore, the angle displacement sensor includes an angle sensor, a sensor mounting base, an angle decoder, a decoder housing, a gasket, a front locking ring, a middle locking ring, a rear locking ring, and a fixed spindle;

[0016] The fixed spindle is a metal round bar; the fixed spindle is provided with external threads, which match the internal threads of the decoder outer cover, the internal threads of the front locking ring, and the internal threads of the rear locking ring.

[0017] Furthermore, a sensing magnetic strip is provided at the center of the angle sensor; and six reinforcing screw holes are provided on the side of the sensor mounting base.

[0018] The sensing magnetic strip is square and is embedded in the recessed hole in the center of the angle sensor base;

[0019] The shape of the sensing magnetic strip matches the concave hole in the center of the angle sensor.

[0020] Furthermore, the sensor mounting base is cylindrical; the side of the sensor mounting base is provided with 6 reinforcing screw holes; the inner concave surface of the sensor mounting base is provided with 6 recessed holes.

[0021] Furthermore, the angle decoder is used to analyze the rotation angle sensed by the angle sensor and convert the rotation angle into an output voltage or current;

[0022] The control lines of the angle decoder include at least a positive DC power line, a negative DC power line, and an output signal line;

[0023] The control line of the angle decoder is connected to the data acquisition unit. The data acquisition unit provides power to the angle decoder and samples and calculates the output signal of the angle decoder.

[0024] Furthermore, the decoder casing is a concave, hollow cylindrical shape;

[0025] The hollow portion of the decoder housing is a decoder embedding hole, and the size of the decoder embedding hole matches the shape of the decoder.

[0026] The depth of the decoder embedding hole is the same as the height of the decoder.

[0027] Furthermore, the gasket is used for shock absorption to prevent damage to the decoder due to improper handling when fastening the decoder and decoder housing assembly;

[0028] The gasket is a circular non-metallic sheet, preferably made of engineering plastic.

[0029] Furthermore, the front locking ring is a hollow metal ring, and the diameter of the ring hole matches the outer diameter of the fixed spindle;

[0030] The inner side of the front locking ring has an internal thread that matches the external thread of the fixed spindle.

[0031] Furthermore, the locking ring is a hollow metal ring, and the diameter of the ring hole matches the outer diameter of the fixed spindle;

[0032] The locking ring has an internal thread on its inner side, which matches the external thread of the fixed spindle.

[0033] Furthermore, the rear locking ring is a hollow metal ring, and the diameter of the ring hole matches the outer diameter of the fixed spindle;

[0034] The inner side of the rear locking ring has an internal thread that matches the external thread of the fixed spindle.

[0035] The beneficial effects of this invention are:

[0036] 1. A non-contact angular displacement sensor is adopted to avoid the problem of spindle eccentricity. The angular displacement sensor is fixed on the rotating spindle, and the angular displacement resolver is fixed on a fixed structure that does not contact the rotating spindle. The two do not contact each other, and the eccentricity of the rotating spindle will not damage the non-contact angular displacement sensor, thus realizing real-time and reliable monitoring of the displacement of the vacuum circuit breaker.

[0037] 2. By utilizing the rotating spindle mounting and debugging hole on the side of the vacuum circuit breaker and employing a sleeve-type design, the sensor can be easily installed. A fixed spindle is designed, which passes through the debugging hole of the circuit breaker and is locked to the side wall of the circuit breaker by front and rear locking rings. Non-contact sensors are fixed on the fixed spindle, thus solving the sensor installation problem. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of an online monitoring device according to a preferred embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the structure of an adaptive angular displacement sensor according to a preferred embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of the structure of an angle sensor according to a preferred embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the sensor base according to a preferred embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the structure of an angle decoder according to a preferred embodiment of the present invention;

[0043] Figure 6 This is a schematic diagram of the structure of the decoder housing according to a preferred embodiment of the present invention;

[0044] Figure 7 This is a schematic diagram of the structure of a gasket according to a preferred embodiment of the present invention;

[0045] Figure 8 This is a schematic diagram of the structure of the front compression ring in a preferred embodiment of the present invention;

[0046] Figure 9 This is a schematic diagram of the compression ring in a preferred embodiment of the present invention;

[0047] Figure 10 This is a schematic diagram of the structure of the compression ring in a preferred embodiment of the present invention;

[0048] Figure 11This is a schematic diagram of a preferred embodiment of the fixed spindle of the present invention. Detailed Implementation

[0049] The preferred embodiments of the present invention are described below with reference to the accompanying drawings to make the technical content clearer and easier to understand. The present invention can be embodied in many different forms, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0050] An online travel monitoring device for a vacuum circuit breaker, such as Figure 1 As shown, it mainly includes a data acquisition unit, a tripping current sensor, a closing current sensor, and an adaptive angle displacement sensor.

[0051] The main function of a data acquisition device is to collect, analyze, and process data.

[0052] The data acquisition unit monitors the trip current sensor and the closing current sensor in real time. When the data acquisition unit detects that the trip current sensor has a trip action current, it starts data acquisition from the trip current sensor and the adaptive angle displacement sensor.

[0053] When the data acquisition unit detects that the closing current sensor has sensed the closing action current, it starts data acquisition from the closing current sensor and the adaptive angle displacement sensor.

[0054] The data acquisition unit analyzes the collected data, extracts, saves, and transmits parameters to enable online monitoring of the mechanical characteristic parameters of the switchgear.

[0055] The data acquisition unit is installed in the instrument room of the switch cabinet;

[0056] The main function of the trip current sensor is to sense the operating current during the tripping process of the vacuum circuit breaker, determine the energizing time of the tripping coil, and simultaneously start sampling of the tripping stroke.

[0057] The trip current sensor adopts a non-contact design and only needs to be clipped onto the power supply line of the trip coil.

[0058] The main function of the closing current sensor is to sense the operating current during the closing process of the vacuum circuit breaker, determine the energizing time of the closing coil, and simultaneously start sampling of the closing stroke.

[0059] The closing current sensor adopts a non-contact design and only needs to be clipped onto the power supply line of the closing coil.

[0060] The angle displacement sensor includes an angle sensor 1, a sensor mounting base 2, an angle decoder 3, a decoder housing 4, a gasket 5, a front locking ring 6, a middle locking ring 7, a rear locking ring 8, and a fixed spindle 9, as shown. Figure 2 As shown.

[0061] The angle sensor functions to rotate with the rotating main shaft 99 of the vacuum circuit breaker, sensing the rotation angle and direction of the main shaft 99 during the opening and closing process; for example... Figure 3 As shown,

[0062] A sensing magnetic strip 11 is provided at the center of the angle sensor 1;

[0063] The sensing magnetic strip is square and is embedded in the recessed hole in the center of the angle sensor base;

[0064] The shape of the sensing magnetic strip matches the concave hole in the center of the angle sensor, and the two fit together tightly.

[0065] The bottom and sidewalls of the sensing magnetic strip are bonded to the angle sensor base as one piece using an adhesive dispensing method;

[0066] The angle sensor has two mounting holes 12, which match the mounting holes on the sensor mounting base; screws are used to fix the angle sensor to the angle sensor mounting base through these two mounting holes.

[0067] The angle sensor base is made of non-metallic material.

[0068] The sensor mounting base 2 is cylindrical; such as Figure 4 As shown,

[0069] On the front of the angle sensor 1, there are two angle sensor mounting holes 21, and the hole positions match the positions of the fixing through holes 12 of the angle sensor 1.

[0070] The sensor mounting base 2 has 6 reinforcing screw holes 22 on its side, which can be screwed into the set screws for secondary reinforcement;

[0071] The inner concave surface of the sensor mounting base 2 is designed with 6 recessed holes 23. The size of the recessed holes 23 matches the shape of the end of the rotating main shaft of the vacuum circuit breaker, and the two are in a tight fit relationship.

[0072] The sensor mounting base 2 has a hollow structure, and the size of the hollow part matches the spline 991 at the end of the circuit breaker main shaft. The two are in a tight fit relationship.

[0073] During installation, the angle sensor mounting base 2 is first coated with fixing adhesive and inserted into the spline 991 at the end of the vacuum circuit breaker rotating spindle to form a tight fit.

[0074] The adhesive used to fix the sensor mounting base 2 is preferably a fast-drying anaerobic adhesive, and the curing time of the fast-drying anaerobic adhesive is preferably within 4 hours.

[0075] After the sensor mounting base 2 is installed, do not immediately operate the vacuum circuit breaker to avoid affecting the curing of the adhesive.

[0076] The function of angle decoder 3 is to analyze the rotation angle sensed by the angle sensor and convert the rotation angle into output voltage or current; for example... Figure 5 As shown.

[0077] The control line 32 of the angle decoder 3 includes a positive DC power supply line, a negative DC power supply line, and an output signal line;

[0078] The output signal can be either voltage or current. Regardless of whether it is voltage or current, it has a fixed relationship with the rotation angle of the angle sensor, and the sensed angle can be calculated from the voltage or current value.

[0079] The control line of the angle decoder 3 is connected to the data acquisition unit. The data acquisition unit provides power to the angle decoder and samples and calculates the output signal of the angle decoder.

[0080] The control line 32 of the angle decoder 3 must have a shielding layer on the outside to prevent external interference from crosstalking the signal lines.

[0081] The output of angle decoder 3 is preferably of the current output type;

[0082] Angle decoder 3 can also use digital output, that is, the angle decoder has built-in AD sampling function and digital communication function, but the AD sampling rate must not be lower than 10K;

[0083] The angle decoder 3 is circular in shape, with the sensing area 31 at the center;

[0084] After installation, the center of the sensing area 31 coincides with the center of the sensing magnet 11 of the angle sensor.

[0085] Angle decoder 3 comes with mounting hole 33;

[0086] The control line 32 of the angle decoder 3 passes through the cable hole of the decoder housing;

[0087] The height of the angle decoder 3 matches the depth of the recess in the center of the decoder housing 4, and the bottoms of the two are flush after installation.

[0088] The decoder casing 4 is a concave, hollow cylindrical shape; for example... Figure 6 As shown,

[0089] The hollow part of the decoder outer casing 4 is the decoder embedding hole 41, and the size of the decoder embedding hole 41 matches the shape of the decoder.

[0090] The depth of the decoder embedding hole 41 is the same as the height of the decoder. After the decoder is embedded in the decoder recess, it forms a whole and presses against the end face of the fixed spindle.

[0091] The middle part of the decoder casing 4 has a cable through hole, the diameter of which is slightly larger than the sensing area of ​​the decoder;

[0092] The outer edge of the decoder cover 4 is provided with 3 decoder fixing holes 42, with an angle of 120° between the holes. The decoder fixing holes 42 match the mounting holes of the base of the decoder cover 4. The combination of the angle decoder 3 and the decoder cover 4 can be fixed on the gasket 5 and the front locking ring 6 through these 3 fixing holes.

[0093] Below the decoder housing 4, there is a cable notch 43 through which the decoder's cable extends.

[0094] During installation, apply glue to the threaded holes of the decoder housing 4 to reinforce the decoder housing 4 and the spindle after tightening.

[0095] The decoder housing is preferably made of engineering plastic.

[0096] The function of shim 5 is to absorb vibration and prevent damage to the decoder due to improper operation when tightening the assembly of angle decoder 3 and decoder housing 4; for example Figure 7 As shown,

[0097] Gasket 5 is a circular non-metallic sheet, preferably made of engineering plastic;

[0098] The shim 5 has a countersunk hole 51 for fixing, and the diameter of the hole matches the diameter of the threaded hole for fixing the center of the spindle.

[0099] The outer edge of the gasket 5 has three decoder assembly mounting holes 52, which match the mounting holes of the decoder housing 4 and the mounting holes on the outer edge of the front locking ring 6. Screws pass through these holes to fix the assembly of the angle decoder 3 and the decoder housing 4, as well as the gasket 5, onto the front locking ring 6.

[0100] The front locking ring 6 is a hollow metal ring, and the diameter of the ring hole matches the outer diameter of the fixed spindle; for example Figure 8 As shown,

[0101] The inner side of the front locking ring 6 has an internal thread that matches the external thread of the fixed spindle.

[0102] The thickness of the front locking ring 6 is not less than 5mm;

[0103] The outer edge of the front locking ring 6 has 6 fixing threaded holes 61;

[0104] The six fixing threaded holes 61 are arranged in groups of three at 120° intervals, which match the three decoder assembly fixing holes 52 on the gasket 5. During installation, the decoder assembly only needs to be rotated by a maximum of 30° to be fixed and installed.

[0105] During installation, rotate the front locking ring 6 forward and place it tightly against the back of the gasket 5. After installation, the angle sensor, sensor housing, gasket, and front locking ring form a whole.

[0106] The locking ring 7 is a hollow metal ring, and the diameter of the ring hole matches the outer diameter of the fixed spindle; for example Figure 9 As shown,

[0107] The inner side of the locking ring 7 has an internal thread that matches the external thread of the fixed spindle.

[0108] The outer diameter of the central locking ring 7 has three locking holes A71, which are locked by a Y-type wrench;

[0109] The seven locking rings are installed on the inner side of the metal plate on the side wall of the circuit breaker, inside the circuit breaker chamber.

[0110] The outer diameter of the central locking ring 7 is more than 8mm larger than the diameter of the mounting and debugging hole of the rotary spindle.

[0111] The thickness of the central locking ring 7 shall not be less than 5mm.

[0112] The rear locking ring 8 is a hollow metal ring, and the diameter of the ring hole matches the outer diameter of the fixed spindle; for example Figure 10 As shown,

[0113] The inner side of the rear locking ring 8 has an internal thread that matches the external thread of the fixed spindle.

[0114] The outer diameter of the rear locking ring 8 has 6 locking holes B81, which can be locked by a Y-type wrench;

[0115] The rear locking ring 8 is installed on the outside of the metal plate on the side wall of the circuit breaker, outside the circuit breaker compartment;

[0116] The outer diameter of the rear locking ring 8 is more than 8mm larger than the diameter of the mounting and debugging hole of the rotating spindle;

[0117] The thickness of the rear locking ring 8 shall not be less than 5mm;

[0118] During installation, the middle locking ring 7 rotates backward and the rear locking ring 8 rotates forward, clamping together to fix the rotating spindle and other components to the side baffle.

[0119] The fixed spindle 9 is a metal round bar; such as Figure 11 As shown,

[0120] The fixed spindle 9 is provided with an external thread that matches the internal thread of the middle locking ring 7, the internal thread of the front locking ring 6, and the internal thread of the rear locking ring 8.

[0121] The outer diameter of the fixed spindle 9 is slightly smaller than the diameter of the rotating spindle mounting and adjustment hole to ensure easy insertion into the rotating spindle mounting and adjustment hole;

[0122] The fixed spindle 9 can be freely adjusted in the mounting and debugging hole of the rotating spindle to ensure that after installation, the angle decoder and the angle sensor are concentric and the distance between their end faces is 1 to 2 mm.

[0123] The length of the fixed spindle should not be too long to ensure that it will not affect the pushing and pulling of the vacuum circuit breaker inside the switch cabinet after installation.

[0124] The installation steps for the angle displacement sensor are as follows:

[0125] (1) Apply glue to the inside of the angle sensor mounting base;

[0126] (2) Align the sensor mounting base with the spline at the end of the rotating spindle;

[0127] (3) Pass a flat metal rod through the mounting and debugging hole of the rotating spindle. The diameter of the metal rod should be larger than the diameter of the sensor mounting base.

[0128] (4) Place a protective pad on the outer end face of the sensor mounting base, tap the metal rod, and press the sensor mounting base into the rotating spindle so that the two fit tightly together.

[0129] (5) Screw the set screw into the threaded hole on the side of the sensor mounting base for reinforcement;

[0130] (6) Clean the outer end face of the sensor mounting base with alcohol;

[0131] (7) Fix the angle sensor to the end face of the sensor mounting base with screws;

[0132] (8) The decoder is embedded inside the decoder housing, and the decoder control line comes out from the cable hole on the decoder housing;

[0133] (9) Pass the fixed spindle through the circuit breaker test hole and extend it into the circuit breaker chamber. Then screw the front locking ring and the middle locking ring onto the fixed spindle.

[0134] (10) The shim is fixed to the fixed spindle by screws;

[0135] (11) The front locking ring rotates forward and fits tightly against the back of the gasket;

[0136] (12) Secure the decoder and decoder housing assembly and gasket to the front locking ring with screws;

[0137] (13) Adjust the position of the fixed spindle so that the angle decoder and the angle sensor are on the same horizontal line;

[0138] (14) Rotate the locking ring backward to put the locking ring into the fixed spindle, and rotate forward to initially fix the fixed spindle;

[0139] (15) Modulate the front and rear positions of the fixed spindle so that the distance between the end face of the decoder housing and the end face of the angle sensor is kept at 1 to 2 mm;

[0140] (16) Rotate the middle locking ring backward and the rear locking ring forward to clamp the metal plate on the side wall of the circuit breaker compartment in the middle; (17) Use a Y-type wrench to tighten the rear locking ring to complete the installation.

[0141] The circuit breaker is installed in the circuit breaker compartment of the switchgear. The side wall of the circuit breaker compartment is a metal plate 112. The metal plate 112 has a circuit breaker installation and adjustment hole for adjusting the position of the circuit breaker during installation. The center of this hole is on the same horizontal line as the center of the circuit breaker's main shaft. The metal plate 112 on the side wall of the circuit breaker compartment is a large plate, and its shape matches the interior structure. Due to the limited space in the circuit breaker compartment, sensors cannot be directly installed; the circuit breaker installation and adjustment hole is the optimal structural component for installing sensors.

[0142] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. An online travel monitoring device for a vacuum circuit breaker, characterized in that, Includes a data acquisition unit, a tripping current sensor, a closing current sensor, and an adaptive angle displacement sensor; The data acquisition device is used for data acquisition, analysis, and processing; The tripping current sensor is used to sense the operating current during the tripping process of the vacuum circuit breaker, determine the energizing time of the tripping coil, and simultaneously start sampling of the tripping stroke. The closing current sensor is used to sense the operating current during the closing process of the vacuum circuit breaker, determine the energizing time of the closing coil, and simultaneously start sampling of the closing stroke. The adaptive angle displacement sensor is used for monitoring the displacement of the vacuum circuit breaker; The adaptive angle displacement sensor includes an angle sensor, a sensor mounting base, an angle decoder, a decoder housing, a gasket, a front locking ring, a middle locking ring, a rear locking ring, and a fixed spindle. The fixed spindle is a metal round bar; the fixed spindle is provided with external threads, which match the internal threads of the decoder outer cover, the internal threads of the front locking ring, and the internal threads of the rear locking ring. The outer diameter of the fixed spindle is slightly smaller than the diameter of the mounting and debugging hole of the rotating spindle.

2. The online travel monitoring device for a vacuum circuit breaker as described in claim 1, characterized in that, A magnetic strip is provided at the center of the angle sensor; six reinforcing screw holes are provided on the side of the sensor mounting base. The sensing magnetic strip is square and is embedded in the recessed hole in the center of the angle sensor base; The shape of the sensing magnetic strip matches the concave hole in the center of the angle sensor.

3. The online travel monitoring device for a vacuum circuit breaker as described in claim 1, characterized in that, The sensor mounting base is cylindrical; the side of the sensor mounting base is provided with 6 reinforcing screw holes; the inner concave surface of the sensor mounting base is provided with 6 recessed holes.

4. The online travel monitoring device for a vacuum circuit breaker as described in claim 1, characterized in that, The angle decoder is used to analyze the rotation angle sensed by the angle sensor and convert the rotation angle into output voltage or current. The control lines of the angle decoder include at least a positive DC power line, a negative DC power line, and an output signal line; The control line of the angle decoder is connected to the data acquisition unit. The data acquisition unit provides power to the angle decoder and samples and calculates the output signal of the angle decoder.

5. The online travel monitoring device for a vacuum circuit breaker as described in claim 1, characterized in that, The decoder casing is a concave, hollow cylindrical shape; The hollow portion of the decoder housing is a decoder embedding hole, and the size of the decoder embedding hole matches the shape of the decoder. The depth of the decoder embedding hole is the same as the height of the decoder.

6. The online travel monitoring device for a vacuum circuit breaker as described in claim 1, characterized in that, The pads are used for shock absorption to prevent damage to the decoder due to improper handling when fastening the decoder and decoder housing assembly; The gasket is a circular piece made of engineering plastic.

7. The online travel monitoring device for a vacuum circuit breaker as described in claim 1, characterized in that, The front locking ring is a hollow metal ring, and the diameter of the ring hole matches the outer diameter of the fixed spindle. The inner side of the front locking ring has an internal thread that matches the external thread of the fixed spindle.

8. The online travel monitoring device for a vacuum circuit breaker as described in claim 1, characterized in that, The locking ring is a hollow metal ring, and the diameter of the ring hole matches the outer diameter of the fixed spindle. The locking ring has an internal thread on its inner side, which matches the external thread of the fixed spindle.

9. The online travel monitoring device for a vacuum circuit breaker as described in claim 1, characterized in that, The rear locking ring is a hollow metal ring, and the diameter of the ring hole matches the outer diameter of the fixed spindle. The inner side of the rear locking ring has an internal thread that matches the external thread of the fixed spindle.

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