A circuit breaker electrical life and mechanical life monitoring device

Abstract

The present invention provides a circuit breaker electrical life and mechanical life monitoring device, comprising: a high-precision angle encoder and a processor installed on the main shaft of the mechanical operating mechanism of the circuit breaker; wherein the high-precision angle encoder is used to accurately measure the angle of each circuit breaker action, and the processor calculates the action stroke according to the angle measured by the high-precision angle encoder, thereby calculating the circuit breaker opening speed and closing speed. The action stroke is the distance moved within a predetermined time period after the circuit breaker is opened or before the circuit breaker is closed; the opening speed is the ratio of the distance moved by the circuit breaker contact within a predetermined time period after the opening contact is closed to the time; the closing speed is the ratio of the distance moved by the circuit breaker contact within a predetermined time period before the closing contact is closed to the time.

Description

Technical Field

[0001] The present invention relates to the field of electronic technology, and in particular to a circuit breaker electrical life and mechanical life monitoring device. Background Art

[0002] Regardless of the state of the line, such as no-load, load, short-circuit fault, etc., the circuit breaker is an important control and protection device in the power system. When the circuit breaker is controlled to operate, it is required to operate reliably or open or close the circuit, quickly cut off the line fault from the power grid line, and ensure the reliable operation of the power grid.

[0003] The function of high-voltage circuit breakers is to open, close and carry the normal current of the operating line. It can also close and open abnormal current within a specified time to protect the safe operation of the entire line.

[0004] At present, there are two main detection methods for circuit breakers: offline and online. The offline method is a scheduled maintenance method, which requires the circuit breaker to be powered off in advance and then disassembled. Frequent disassembly and detection wastes a lot of manpower and material resources, causing power outage losses and reducing equipment life. At the same time, this method also places high demands on the professionalism of personnel and there is a risk of human negligence.

[0005] In addition, the current methods for testing the life of circuit breakers are mainly scheduled maintenance and online monitoring. The scheduled maintenance method requires the circuit breaker to be shut down in advance, and then the circuit breaker is disassembled, and professional equipment and professional personnel conduct a corresponding assessment of the current life of the circuit breaker. This method will reduce the life of the circuit breaker by disassembling it. At the same time, this method also places high demands on the professionalism of the personnel and there is a risk of human negligence.

[0006] The life of a circuit breaker consists of electrical life and mechanical life. At present, the conversion method of electrical life is usually to use the cumulative breaking current of the primary circuit to judge, such as 50kAx20 times and 5kAx200 times, the burning of the arc extinguishing chamber is very different; there are also arcing time to convert the life. These conversion methods have low accuracy and cannot accurately reflect the current operating status of the circuit breaker. At the same time, the difficulty of engineering practice is relatively high. The judgment of mechanical life is also inferred based on the number of breaking times. Some abnormal wear and defects cannot be discovered in time and corresponding alarm reminders cannot be issued. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a circuit breaker electrical life and mechanical life monitoring device for real-time monitoring of the life of the circuit breaker by collecting the primary circuit breaking current and the opening and closing speed in view of the above-mentioned defects in the prior art.

[0008] According to the present invention, a circuit breaker electrical life and mechanical life monitoring device is provided, which is characterized by comprising: a high-precision angle encoder and a processor installed on the main shaft of the mechanical operating mechanism of the circuit breaker; wherein the high-precision angle encoder is used to accurately measure the angle of each circuit breaker action, and the processor calculates the action stroke according to the angle measured by the high-precision angle encoder, thereby calculating the circuit breaker opening speed and closing speed.

[0009] Preferably, the stroke of the action is the distance moved within a predetermined time period after the circuit breaker is opened or before the circuit breaker is closed; the opening speed is the ratio of the distance moved by the circuit breaker contacts within a predetermined time period after the opening contacts are closed to the time; the closing speed is the ratio of the distance moved by the circuit breaker contacts within a predetermined time period before the closing contacts are closed to the time.

[0010] Preferably, the predetermined time period is 10 ms.

[0011] Preferably, the high-precision angle encoder comprises: a shaft mounting part and an encoder body; wherein the shaft mounting part comprises a shaft coupling, a clamp and a clamp, wherein the shaft coupling is fixed to the motor spindle of the mechanical operating mechanism of the circuit breaker so as to rotate with the motor spindle; the spindle of the encoder body is mounted to the axial hole of the shaft coupling, and is clamped by the clamp and then fixed to the mechanism box housing, thereby keeping the encoder body fixed to the mechanism box housing.

[0012] Preferably, the processor collects the pulse signal output by the high-precision angle encoder in real time based on the sampling rate, obtains the time T1 through the change of the state of the opening and closing contacts, and reads the data of the high-precision angle encoder at the same time and records it as Q1.

[0013] For the opening condition, the encoder data read by the processor after 10ms is recorded as Q2;

[0014] Then the rotation angle R1 = (Q2 – Q1) / 4 * (1024 / 360);

[0015] L1 = (R1*2π) / 360 * r * K;

[0016] Among them, L1 is the opening stroke, R1 is the rotation angle, r is the shaft length, and K is the transmission ratio;

[0017] Opening speed V = L1 / 0.01;

[0018] The mechanical life of the opening loss is:

[0019] ;

[0020] V0 is the standard opening speed of the circuit breaker, and N0 is the total number of mechanical opening and closing times defined by the circuit breaker;

[0021] For the closing condition, the processor 200 reads the encoder output data 10ms before the closing contact is closed and records it as Q2.

[0022] Then the rotation angle R2 = (Q2 – Q1) / 4 * (1024 / 360);

[0023] L2 = (R2*2π ) / 360 * r * K;

[0024] L2 is the closing stroke, R2 is the rotation angle, r is the shaft length, and K is the transmission ratio;

[0025] Closing speed V = L2 / 0.01;

[0026] Closing loss mechanical life is:

[0027] ;

[0028] V0 is the standard closing speed of the circuit breaker, and N0 is the total number of mechanical opening and closing times defined by the circuit breaker.

[0029] Then the total mechanical life loss Ym = Y1+Y2.

[0030] Preferably, the processor performs the following calculations:

[0031] The calculation formula for the relative electrical wear of the circuit breaker under different breaking currents Ic is as follows:

[0032] ;

[0033] ;

[0034] Where, N is the number of times the circuit breaker is broken under the rated short-circuit current, Ic is the current breaking current, Ie is the rated short-circuit current; α and β are reference coefficients;

[0035] Calculate the cumulative relative electrical wear after n times:

[0036] ;

[0037] For a new circuit breaker, its life is defined as 100%, that is, 1;

[0038] The remaining life of the circuit breaker can be calculated as Lm = 1-(Qm+Ym).

[0039] Preferably, the circuit breaker electrical life and mechanical life monitoring device also includes: a power supply module for providing a low-voltage power supply for the entire circuit breaker electrical life and mechanical life monitoring device; a communication module for data interaction with the background host; and an Ethernet module for data interaction with the background to transmit images or curve data.

[0040] Preferably, the circuit breaker electrical life and mechanical life monitoring device further comprises: a current transformer module, which is used to measure the current size of the primary circuit.

[0041] Preferably, the circuit breaker electrical life and mechanical life monitoring device further comprises: a photoelectric encoder module for preprocessing the signal output by the high-precision angle encoder before the signal is processed by the processor.

[0042] The circuit breaker electrical life and mechanical life monitoring device according to the present invention can calculate the working current or short-circuit current each time the primary circuit is opened and closed by continuously collecting data from the current transformer through the main processor, and can calculate the loss of the electrical life of the current circuit breaker and the number of times the circuit breaker is opened and closed. The speed data of the circuit breaker when opening and closing can be calculated by collecting the angle encoder. When the opening speed slows down, the arc burning time will be prolonged, thereby accelerating the electrical wear of the circuit breaker contacts and reducing the service life of the circuit breaker. If the closing speed is too fast, the mechanical structure will bear too much stress and impact, shortening the service life. Opening and closing speeds that are too fast or too slow will have a great impact on the life of the circuit breaker.

[0043] Moreover, the circuit breaker electrical life and mechanical life monitoring device according to the present invention can calculate the circuit breaker electrical life loss and mechanical life loss through the above, and the circuit breaker life can be more comprehensively evaluated based on these two data systems, which helps to avoid misjudgment or missed judgment caused by inaccurate estimation in traditional methods.

[0044] In addition, the circuit breaker electrical life and mechanical life monitoring device according to the present invention also has a communication RS485 interface and an Ethernet port, which can upload the circuit breaker data to the smart grid in real time to ensure the timeliness and accuracy of the data, and can capture the slight changes in the circuit breaker operation in the first time, providing strong support for subsequent evaluation and prediction. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] A more complete understanding of the present invention and its attendant advantages and features will be more readily appreciated by reference to the following detailed description taken in conjunction with the accompanying drawings, in which:

[0046] Figure 1 The functional block diagram of the circuit breaker electrical life and mechanical life monitoring device according to the preferred embodiment of the present invention is schematically shown.

[0047] Figure 2 The schematic diagram of the installation structure of the high-precision angle encoder of the circuit breaker electrical life and mechanical life monitoring device according to the preferred embodiment of the present invention is schematically shown.

[0048] Figure 3 A circuit diagram schematically shows an example of a power supply module of a circuit breaker electrical life and mechanical life monitoring device according to a preferred embodiment of the present invention.

[0049] Figure 4 The circuit diagram of an example of a communication 485 module of a circuit breaker electrical life and mechanical life monitoring device according to a preferred embodiment of the present invention is schematically shown.

[0050] Figure 5 The circuit diagram schematically shows an example of an Ethernet module of a circuit breaker electrical life and mechanical life monitoring device according to a preferred embodiment of the present invention.

[0051] Figure 6 A circuit diagram schematically shows an example of a current transformer module of a circuit breaker electrical life and mechanical life monitoring device according to a preferred embodiment of the present invention.

[0052] Figure 7 A circuit diagram of an example of a photoelectric encoder module of a device for monitoring the electrical and mechanical life of a circuit breaker according to a preferred embodiment of the present invention is schematically shown.

[0053] It should be noted that the drawings are used to illustrate the present invention, rather than to limit the present invention. Note that the drawings showing the structures may not be drawn to scale. In addition, in the drawings, the same or similar elements are marked with the same or similar reference numerals. DETAILED DESCRIPTION

[0054] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0056] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0058] Figure 1 The functional block diagram of the circuit breaker electrical life and mechanical life monitoring device according to the preferred embodiment of the present invention is schematically shown.

[0059] like Figure 1 As shown, the circuit breaker electrical life and mechanical life monitoring device according to a preferred embodiment of the present invention includes: a high-precision angle encoder 100 and a processor 200 installed on the main shaft of the mechanical operating mechanism of the circuit breaker; wherein the high-precision angle encoder 100 is used to accurately measure the angle of each circuit breaker action, and the processor 200 calculates the action stroke according to the angle measured by the high-precision angle encoder 100, thereby calculating the circuit breaker opening speed and closing speed.

[0060] Specifically, for example, the stroke of the action is the distance moved within a predetermined time period (for example, 10ms) after the circuit breaker is opened or before the circuit breaker is closed; the opening speed is the ratio of the distance moved by the circuit breaker contacts within a predetermined time period (for example, 10ms) after the opening contacts are closed to the time; the closing speed is the ratio of the distance moved by the circuit breaker contacts within a predetermined time period (for example, 10ms) before the closing contacts are closed to the time.

[0061] <Example of high-precision angle encoder>

[0062] Figure 2 The schematic diagram of the installation structure of the high-precision angle encoder of the circuit breaker electrical life and mechanical life monitoring device according to the preferred embodiment of the present invention is schematically shown. This structural example is used to illustrate the preferred mode of the present invention, but not to limit the present invention.

[0063] like Figure 2As shown, the high-precision angle encoder includes: a shaft mounting part and an encoder body 101; wherein the shaft mounting part includes a coupling 102, a clamp 103 and a clamp 104, wherein the coupling 102 is fixed to the motor main shaft of the mechanical operating mechanism of the circuit breaker so as to rotate with the motor main shaft (for example, one end of the coupling 102 is fixed to the motor main shaft of the mechanical operating mechanism of the circuit breaker); the main shaft of the encoder body 101 is installed to the axial hole of the coupling 102, and is fixed to the mechanism box housing by the clamp 104 after being clamped by the clamp 103, thereby keeping the encoder body 102 fixed to the mechanism box housing.

[0064] Preferably, the clamp 104 is equipped with a universal rod 105 for adjusting the position.

[0065] Preferably, the encoder body is a photoelectric encoder with a parameter of 1024P / R, that is, 1024 pulse signals are output for one rotation.

[0066] <Calculation example>

[0067] For example, the processor 200 collects the pulse signal output by the high-precision angle encoder 100 in real time based on the sampling rate (e.g., 10 KHz), obtains the time T1 through the change of the state of the opening and closing contacts, and reads the data of the high-precision angle encoder 100 and records it as Q1.

[0068] For the opening condition, the encoder data read by the processor 200 after a predetermined time period (e.g., 10 ms) is recorded as Q2;

[0069] Then the rotation angle R1 = (Q2 – Q1) / 4 * (1024 / 360);

[0070] L1 = (R1*2π) / 360 * r * K;

[0071] Among them, L1 is the opening stroke, R1 is the rotation angle, r is the shaft length, and K is the transmission ratio;

[0072] Opening speed V = L1 / 0.01;

[0073] The mechanical life of the opening loss is:

[0074] ;

[0075] V0 is the standard opening speed of the circuit breaker, and N0 is the total number of mechanical opening and closing times defined by the circuit breaker;

[0076] For the closing situation, the processor 200 reads the output data of the encoder before the closing contact is closed for a predetermined period of time (for example, 10ms) and records it as Q2.

[0077] Then the rotation angle R2 = (Q2 – Q1) / 4 * (1024 / 360);

[0078] L2 = (R2*2π ) / 360 * r * K;

[0079] L2 is the closing stroke, R2 is the rotation angle, r is the shaft length, and K is the transmission ratio;

[0080] Closing speed V = L2 / 0.01;

[0081] Closing loss mechanical life is:

[0082] ;

[0083] V0 is the standard closing speed of the circuit breaker, and N0 is the total number of mechanical opening and closing times defined by the circuit breaker.

[0084] Then the total mechanical life loss Ym = Y1+Y2.

[0085] <Example of remaining life calculation>

[0086] The calculation formula for the relative electrical wear of the circuit breaker under different breaking currents Ic is as follows:

[0087] ;

[0088] ;

[0089] Where N is the number of times the circuit breaker is opened and closed at the rated short-circuit current. This data is a fixed value and the product introduction of the circuit breaker installed on site will have this parameter; Ic is the current breaking current and Ie is the rated short-circuit current.

[0090] At the same time, the breaking times N1 under rated current is obtained according to the circuit breaker, and this data is also a fixed parameter;

[0091] α and β are reference coefficients. Specifically, for example, the value of β is calculated by N, and the value of α is calculated by N1. The value of β is generally determined to be 1.7, but the value of α may vary due to process differences of circuit breakers of each manufacturer or the rated current breaking times under different voltage levels; therefore, the value of α needs to be determined based on the circuit breaker data installed on site.

[0092] By determining the above two parameters, we can get the corresponding allowable breaking times Ni under any breaking current, and the corresponding relative electrical wear of a single breaking is 1 / Ni. When the breaking current is less than the rated breaking current, the wear is already very small, so the rated breaking current is regarded as the rated breaking current to calculate the wear; thus, it is deduced that the cumulative relative electrical wear after n times is:

[0093] ;

[0094] For a new circuit breaker, its life is defined as 100%, that is, 1;

[0095] The remaining life of the circuit breaker can be calculated as Lm = 1-(Qm+Ym).

[0096] <System Example>

[0097] In a specific implementation, for example, the processor 200 is a microcontroller unit (MCU).

[0098] And preferably, the circuit breaker electrical life and mechanical life monitoring device according to the preferred embodiment of the present invention includes:

[0099] The power module is used to provide low-voltage power for the entire device. It also has protection circuits such as surge protection, common-mode and differential-mode interference signal protection to improve the anti-interference ability of the entire device.

[0100] Communication module, used for data exchange with the background host. For example, the physical layer that can be used is the standard 485 interface, and the laundry adopts the standard Modbus-RTU protocol;

[0101] Ethernet module, used for data interaction with the background, for example, TCP / IP protocol stack can be used, which has a faster communication rate and can transmit more images or curve data;

[0102] Current transformer module, used to measure the current size of the primary circuit;

[0103] The photoelectric encoder module is used to pre-process the signal output by the high-precision angle encoder 100 before the processor processes it.

[0104] Figure 3 The circuit diagram schematically shows an example of a power module of a circuit breaker electrical life and mechanical life monitoring device according to a preferred embodiment of the present invention. Figure 3As shown, R210 is a varistor that can effectively prevent overvoltage signals such as lightning strikes. C211, R209, CY201, CY202, FL201, C210, FL200, and C207 together form a differential mode and common mode signal Y suppression circuit, which can effectively prevent common mode and differential mode signal interference. After the power input signal enters the circuit through the J200 terminal, it passes through the above series of protection circuits and then passes through the D201 rectifier bridge to convert the AC signal into a DC signal. T200 is a transformer, and U200 is a switching power supply chip. Through a high-frequency electronic switching signal, a stable 12V low-voltage power supply is output at both ends of C204 for use by other modules. Other devices such as R200, D200, L200 in the figure together form a low-voltage power supply protection circuit.

[0105] Figure 4 The circuit diagram of the communication module example of the circuit breaker electrical life and mechanical life monitoring device according to the preferred embodiment of the present invention is schematically shown. In the figure, U302 is an RS485 communication module, which can convert the level signal of the MCU into a standard RS485 communication signal, and at the same time convert the RS485 signal on the communication bus into a level signal that the MCU can recognize; the electronic devices such as D301, D302, D303, R310\R314 in the figure are all interface protection circuits.

[0106] Figure 5 The circuit diagram of an Ethernet module example of the circuit breaker electrical life and mechanical life monitoring device according to the preferred embodiment of the present invention is schematically shown. U304 in the figure is an Ethernet communication chip with a TCP / IP protocol stack inside to realize the function of connecting the device to the Ethernet, J303 is an RJ45 network port, and the remaining resistors, capacitors and other devices are peripheral devices of the Ethernet chip.

[0107] Figure 6 The circuit diagram of the current transformer module of the circuit breaker electrical life and mechanical life monitoring device according to the preferred embodiment of the present invention is schematically shown. After the current transformer signal is connected through the sensor, the RC filter composed of R113 and C103 can filter out the clutter interference in the sensor signal, and then after passing through the U100 operational amplifier chip, the signal is amplified through a two-stage amplifier circuit and transmitted to the signal acquisition port of the main MCU for data collection, calculation and analysis. R117 and R116 in the figure form a first-stage amplifier circuit, and R119 and R118 form a second-stage amplifier circuit, which can dynamically adjust the signal amplification ratio according to the size of the signal input.

[0108] Figure 7The circuit diagram of the photoelectric encoder module of the circuit breaker electrical life and mechanical life monitoring device according to the preferred embodiment of the present invention is schematically shown. The waveform input of the encoder is limited by the D102 voltage regulator tube, and then passes through the Q102 transistor and the R110 matching resistor to transmit the waveform to the MCU for waveform acquisition and processing.

[0109] Figures 3 to 7 The specific circuit examples are only used to illustrate specific examples that may be implemented in the present invention, rather than to limit the present invention. It is sufficient that each module of the present invention can implement relevant functions to solve the technical problems to be solved by the present invention.

[0110] In addition, it should be noted that, unless otherwise specified, the terms "first", "second", "third", etc. in the specification are only used to distinguish the various components, elements, steps, etc. in the specification, and are not used to indicate the logical relationship or sequential relationship between the various components, elements, steps, etc.

[0111] It is to be understood that, although the present invention has been disclosed as a preferred embodiment, the above embodiment is not intended to limit the present invention. For any person skilled in the art, without departing from the scope of the technical solution of the present invention, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A circuit breaker electrical life and mechanical life monitoring device, characterized in that include: A high-precision angle encoder and a processor installed on the main shaft of the mechanical operating mechanism of the circuit breaker; wherein the high-precision angle encoder is used to accurately measure the angle of each circuit breaker action, and the processor calculates the action stroke according to the angle measured by the high-precision angle encoder, thereby calculating the opening speed and closing speed of the circuit breaker; Based on the sampling rate, the processor collects the pulse signal output by the high-precision angle encoder in real time, obtains the time T1 through the change of the state of the opening and closing contacts, and reads the data of the high-precision angle encoder at the same time, which is recorded as Q1. For the opening condition, the encoder data read by the processor after 10ms is recorded as Q2; Then the rotation angle R1 = (Q2 – Q1) / 4 * (1024 / 360); L1 = (R1*2π) / 360 * r * K; Among them, L1 is the opening stroke, R1 is the rotation angle, r is the shaft length, and K is the transmission ratio; Opening speed V = L1 / 0.01; The mechanical life of the opening loss is: ； V0 is the standard opening speed of the circuit breaker, and N0 is the total number of mechanical opening and closing times defined by the circuit breaker; For the closing situation, the processor reads the output data of the encoder 10ms before the closing of the closing contact and records it as Q2. Then the rotation angle R2 = (Q2 – Q1) / 4 * (1024 / 360); L2 = (R2*2π ) / 360 * r * K; L2 is the closing stroke, R2 is the rotation angle, r is the shaft length, and K is the transmission ratio; Closing speed V = L2 / 0.01; Closing loss mechanical life is: ； V0 is the standard closing speed of the circuit breaker, and N0 is the total number of mechanical opening and closing times defined by the circuit breaker; Then the total mechanical life loss is Ym = Y1+Y2; The processor performs the following calculations: The calculation formula for the relative electrical wear of the circuit breaker under different breaking currents Ic is as follows: ； ； Where, N is the number of times the circuit breaker is broken under the rated short-circuit current, Ic is the current breaking current, Ie is the rated short-circuit current; α and β are reference coefficients; Calculate the cumulative relative electrical wear after n times: ； For a new circuit breaker, its life is defined as 100%, that is, 1; The remaining life of the circuit breaker can be calculated as Lm = 1-(Qm+Ym).

2. The circuit breaker electrical life and mechanical life monitoring device according to claim 1, characterized in that: The stroke of the action is the distance moved within a predetermined time period after the circuit breaker is opened or before the circuit breaker is closed; the opening speed is the ratio of the distance moved by the circuit breaker contact within a predetermined time period after the opening contact is closed to the time; Closing speed is the ratio of the distance the circuit breaker contacts move in a predetermined period of time before the closing contacts close to the time.

3. The circuit breaker electrical life and mechanical life monitoring device according to claim 2, characterized in that: The predetermined time period is 10 ms.

4. The circuit breaker electrical life and mechanical life monitoring device according to claim 1 or 2, characterized in that: The high-precision angle encoder comprises: a shaft mounting part and an encoder body; wherein the shaft mounting part comprises a shaft coupling, a clamp and a clamp, wherein the shaft coupling is fixed to the motor main shaft of the mechanical operating mechanism of the circuit breaker so as to rotate with the motor main shaft; the main shaft of the encoder body is mounted to the shaft hole of the shaft coupling, and is clamped by the clamp and then fixed to the mechanism box housing, thereby keeping the encoder body fixed to the mechanism box housing.

5. The circuit breaker electrical life and mechanical life monitoring device according to claim 1 or 2, characterized in that Also includes: Power supply module, used to provide low voltage power supply for the entire circuit breaker electrical life and mechanical life monitoring device; Communication module, used for data interaction with the background host; Ethernet module, used to interact with the background data to transmit image or curve data.

6. The circuit breaker electrical life and mechanical life monitoring device according to claim 1 or 2, characterized in that Also includes: The current transformer module is used to measure the current in the primary circuit.

7. The circuit breaker electrical life and mechanical life monitoring device according to claim 1 or 2, characterized in that Also includes: The photoelectric encoder module is used to pre-process the signal output by the high-precision angle encoder before it is processed by the processor.

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