CN112816859A - On-line monitoring and intelligent evaluation system for on-off coil state of circuit breaker - Google Patents
On-line monitoring and intelligent evaluation system for on-off coil state of circuit breaker Download PDFInfo
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
Abstract
The invention discloses a circuit breaker opening and closing coil state online monitoring and intelligent evaluation system, which comprises: the circuit breaker comprises a sensor assembly, a circuit breaker mechanical state sensing device, a display and a three-way isolation power supply; the circuit breaker mechanical state sensing device is respectively connected with the sensor assembly, the display and the three-way isolation power supply; the sensor assembly collects opening and closing coil current signals, contact travel signals and vibration signals of the circuit breaker in different fault states; the circuit breaker mechanical state sensing device extracts and analyzes characteristic parameters of a current signal, a contact travel signal and a vibration signal of a switching-on/off coil, and classifies and judges faults by using a support vector machine; the display is used for displaying the fault diagnosis result. The method can acquire the characteristic parameters under various fault states, enrich and improve the sample data of the characteristic parameters, quantize the state of the closing coil and improve the diagnosis accuracy.
Description
Technical Field
The invention relates to the technical field of fault diagnosis of circuit breakers, in particular to an on-line monitoring and intelligent evaluation system for the on-off state of a switching coil of a circuit breaker.
Background
The high-voltage circuit breaker is one of the most important power equipment in a power system, not only plays a role in controlling the current of a live switch normal load, but also plays a role in protecting the load, the on/off and the on/off of abnormal current within a specified time, and the reliability of the high-voltage circuit breaker is directly related to the safe and stable operation of the power system. In the actual operation process of a power grid, common faults of the opening and closing coils of the circuit breaker include power supply voltage drop, poor contact of a power supply loop, iron core jamming and the like, and the faults can cause starting delay of the movable iron core and too low movement speed, so that the circuit breaker is rejected. If the failure is not detected in time, an accident such as a fire may be caused.
At present, a substation mainly overhauls a high-voltage circuit breaker opening and closing coil regularly, but the high-voltage circuit breaker regular overhaul system is large in blindness and needs to be disassembled, and new problems can be brought in the disassembling and assembling process frequently. Two methods are mainly adopted when fault diagnosis is carried out on the split switching-on coil: firstly, finding out a characteristic value from the current waveform of the opening and closing coil, and judging the working state of the coil through the characteristic value; and secondly, establishing an envelope curve of a mechanical stroke curve and a current curve of the opening and closing coil, considering the envelope curve to be normal, and otherwise, determining the envelope curve to be a fault.
For the characteristic value method, the fault judgment principle is that the characteristic value does not exceed a certain limit on time fluctuation and amplitude fluctuation. When the characteristic value has a large difference in time or amplitude, the action is considered to have a fault. However, the eigenvalue is obtained by analyzing the physical process, the analysis process often requires human input with professional knowledge, and the extracted eigenvalue cannot necessarily realize optimal distinction between normal and fault, which has certain limitations.
For the envelope curve method, from the contact separation time during opening or the contact time during closing to the contact stroke termination time, the upward and downward adjustment of a contact stroke curve by 5% is taken as a standard envelope curve, and when an actual curve exceeds the envelope curve range, a fault is considered to occur. The standard is for the contact travel curve and not for the opening and closing coil current curve. Although the envelope method is simple and easy to implement, the difference of coil models is not considered, and only the floating range of the curve is determined empirically.
Therefore, how to provide an on-line monitoring and intelligent evaluation system for the state of the opening and closing coil of the circuit breaker, which integrates field detection, analysis and judgment and state evaluation, can monitor equipment in real time, and has high intelligent degree and wide applicability, is a problem that needs to be solved urgently by technical personnel in the field.
Disclosure of Invention
In view of this, the invention provides an on-line monitoring and intelligent evaluation system for the state of a switching-on/off coil of a circuit breaker, which can acquire characteristic parameters in various fault states, enrich and perfect sample data of the characteristic parameters, quantize the state of the switching-on coil, and improve diagnosis accuracy.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a circuit breaker divide-shut brake coil state on-line monitoring and intelligent evaluation system, includes: the circuit breaker comprises a sensor assembly, a circuit breaker mechanical state sensing device, a display and a three-way isolation power supply; the mechanical state sensing device of the circuit breaker is provided with a display interface, a power supply interface and a sensor interface;
the signal input ends of the sensor assemblies are respectively and electrically connected with the relevant detection nodes of the current collection test platform of the opening and closing coil of the circuit breaker, and the signal output ends of the sensor assemblies are respectively and electrically connected with the sensor interfaces in a one-to-one correspondence manner; the display is electrically connected with the display interface; the three isolated power supplies are electrically connected with the power interface;
the sensor assembly is used for acquiring opening and closing coil current signals, contact travel signals and vibration signals of the circuit breaker opening and closing coil current acquisition test platform under different fault states of the simulated circuit breaker;
the circuit breaker mechanical state sensing device is used for extracting characteristic parameters of current signals, contact travel signals and vibration signals of the opening and closing coils, analyzing relative changes and change reasons between the characteristic parameters in each fault state and the characteristic parameters in a normal state, and classifying and judging faults by using a support vector machine;
the display is used for displaying the classification judgment result of the mechanical state sensing device of the circuit breaker on the current fault.
Preferably, in the on-line monitoring and intelligent evaluation system for the state of the opening and closing coil of the circuit breaker, the sensor assembly comprises a vibration sensor, a hall current sensor and an angular displacement sensor; the signal output end of the vibration sensor, the signal output end of the Hall current sensor and the signal output end of the angular displacement sensor are respectively connected with the sensor interfaces in a one-to-one correspondence manner;
the vibration sensor is used for collecting vibration signals generated by contact collision in the opening and closing processes of the circuit breaker;
the Hall current sensor is used for collecting current signals of the opening and closing coils when the circuit breaker operates;
the angular displacement sensor is used for acquiring a circuit breaker contact stroke signal.
Preferably, in the on-line monitoring and intelligent evaluation system for the state of the opening and closing coil of the circuit breaker, a display control module and a main control chip are integrated in the mechanical state sensing device of the circuit breaker; an RTOS system program is loaded in the main control chip; the display control module is electrically connected with the display; the main control chip is electrically connected with the sensor interface and the display control module respectively.
Preferably, in the on-line monitoring and intelligent evaluation system for the state of the opening and closing coil of the circuit breaker, a busbar is further included; the circuit breaker mechanical state sensing device is also provided with a busbar interface; one end of the busbar is connected with the busbar interface, and the other end of the busbar is connected with other experimental equipment; and the main control chip acquires relevant data of other experimental equipment through the busbar.
Preferably, in the on-line monitoring and intelligent evaluation system for the state of the opening and closing coil of the circuit breaker, the main control chip acquires a plurality of groups of opening and closing coil current signals, contact travel signals and vibration signals under different fault states through the sensor interface, extracts characteristic parameters, screens the characteristic parameters by using a principal component analysis method, and establishes a characteristic parameter sample library under the normal state and the fault state of the opening and closing coil; and classifying and judging the current fault state by combining a support vector machine with the characteristic parameter sample library.
Preferably, in the on-line monitoring and intelligent evaluation system for the state of the opening and closing coil of the circuit breaker, an LED indicator lamp is embedded in the display; the LED indicator light is used for sending corresponding indication signals to the working state, the communication state and the fault state of the display.
Preferably, in the on-line monitoring and intelligent evaluation system for the state of the opening and closing coil of the circuit breaker, the sensor assembly further comprises an infrared sensor; a temperature monitoring module and an alarm module are integrated in the mechanical state sensing device of the circuit breaker; the signal input end of the infrared sensor is connected with the corresponding detection node of the current collection test platform of the opening and closing coil of the circuit breaker, and the signal output end of the infrared sensor is electrically connected with the temperature monitoring module; the alarm module is electrically connected with the temperature monitoring module;
the temperature monitoring module is used for analyzing the temperature data of each detection node and triggering the alarm module to give an alarm when the temperature data exceeds a threshold value.
Preferably, in the on-line monitoring and intelligent evaluation system for the state of the opening and closing coil of the circuit breaker, a mobile terminal is further included; a wireless communication module is integrated in the mechanical state sensing device of the circuit breaker; the main control chip is in wireless communication with the mobile terminal through the wireless communication module.
Preferably, in the on-line monitoring and intelligent evaluation system for the state of the opening and closing coil of the circuit breaker, the wireless communication module is a 5g communication module, a ZigBee module, a WiFi module or a bluetooth module.
Preferably, in the on-line monitoring and intelligent evaluation system for the state of the opening and closing coil of the circuit breaker, the display is connected with the display interface through an RS485 bus.
According to the technical scheme, compared with the prior art, the on-line monitoring and intelligent evaluation system for the on-off state of the circuit breaker switching-on and switching-off coil is disclosed and provided, and compared with the prior art, the on-off state monitoring and intelligent evaluation system simulates the faults of voltage drop fault, poor contact fault of a switching-on and switching-off coil loop, turn-to-turn short circuit fault of the switching-on and switching-off coil and the like through a current collection test platform of the switching-on and switching-off coil of the circuit breaker, and collects data signals of current signals, contact travel signals, vibration signals and the like of the switching-; and then, extracting characteristic parameters in each data signal by using a mechanical state sensing device of the circuit breaker, and researching and analyzing the corresponding relation between the state of the opening and closing coil and the current curve by analyzing the change rule of the current curve when the opening and closing coil is normal and has a fault. On the basis, quantitative indexes such as current curve time, wave crest and trough parameters, curve fractal dimension and the like are introduced, characteristic parameters representing the state of the opening and closing coil are combed, and a principal component analysis method is used for screening the characteristic parameters, so that a characteristic parameter sample library for normal and fault opening and closing coils is established, the characteristic parameters are enriched, the characteristics of multiple types, large information coverage and large data volume are realized, and a basis is provided for accurate diagnosis of faults.
The invention also fuses a plurality of characteristic parameters to form a characteristic parameter set for expressing different opening and closing coil states, and the diagnosis accuracy is determined by comparing the diagnosis accuracy of the support vector machine model optimized by different artificial intelligence algorithms (particle swarm optimization, cuckoo optimization, genetic algorithm and the like), so that the optimal support vector machine model parameter applied to the opening and closing coil state diagnosis is determined, and the opening and closing coil state diagnosis method with multi-parameter fusion is constructed, and the diagnosis method is verified in the field, monitoring data is continuously accumulated, and the diagnosis accuracy is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a structural block diagram of a circuit breaker opening and closing coil state online monitoring and intelligent evaluation system provided by the invention;
FIG. 2 is a flow chart illustrating fault diagnosis of a circuit breaker according to the present invention;
fig. 3a and 3b are schematic structural diagrams of the current collection test platform of the circuit breaker opening and closing coil provided by the invention when the current collection test platform is in different actions;
fig. 4 is a schematic circuit diagram of the experimental platform for collecting the current of the switching-on and switching-off coil of the circuit breaker provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention discloses an on-line monitoring and intelligent evaluation system for the state of a switching-on/off coil of a circuit breaker, including: the circuit breaker comprises a sensor assembly 1, a circuit breaker mechanical state sensing device 2, a display 3 and a three-way isolation power supply 4; the circuit breaker mechanical state sensing device 2 is provided with a display interface 201, a power interface 202 and a plurality of sensor interfaces 203;
the signal input end of the sensor assembly 1 is electrically connected with the relevant detection node of the current collection test platform of the opening and closing coil of the circuit breaker respectively, and the signal output end is electrically connected with each sensor interface 203 in a one-to-one correspondence manner; the display 3 is connected with the display interface 201 through an RS485 bus.
The three-way isolation power supply 4 is electrically connected with the power interface 202;
the sensor assembly 1 is used for acquiring opening and closing coil current signals, contact travel signals and vibration signals of the opening and closing coil current acquisition test platform of the circuit breaker in different fault states of the simulated circuit breaker;
the circuit breaker mechanical state sensing device 2 is used for extracting characteristic parameters of current signals, contact travel signals and vibration signals of the opening and closing coils, analyzing relative changes and change reasons between the characteristic parameters in each fault state and the characteristic parameters in a normal state, and classifying and judging faults by using a support vector machine;
the display 3 is used for displaying the classification judgment result of the current fault by the circuit breaker mechanical state sensing device 2.
As shown in fig. 3a-3b, the experimental platform for collecting the current of the opening and closing coil of the circuit breaker comprises a motion simulation part, a control circuit part and a signal collection part. The motion simulation part consists of a frame 10, a movable iron core, a switching-on and switching-off coil 20, a pawl 30, a pressure spring 40 and a lock bolt 50; the signal acquisition part consists of a data acquisition card, an upper computer, a voltage probe and a current sensor.
A lock hole is arranged in the middle of the pawl 30 and is fixed through a screw rod, so that the pawl 30 can only rotate; the upper end of the latch 30 is provided with a metal rod for limiting the position of the latch 30, and the position of the latch 30 is fixed through the metal rod; a compression spring 40 is provided at the lower end of the catch 30 for the resetting process of the catch 30. A compression spring is also attached to the left side of the pawl 30. when the pawl 40 is in the upright position, the left compression spring 30 is at its original length and when the pawl 30 is pushed to the left by the compression spring 40, the lower compression spring 40 is compressed to provide the pushing force for resetting the pawl 30.
The detailed movement process of the action part is as follows:
1) and the upper computer sets the conduction time interval of the power switch through the data acquisition card. The hand wheel of the pressure spring is rotated to adjust the elasticity of the pressure spring, so that the pressure for keeping the pawl is always provided in the movement process of the iron core.
2) The opening and closing coil is conducted under the control of an upper computer, the movable iron core is attracted, the pawl is pushed, the pawl moves under the action of the pressure spring, the auxiliary switch 60 is switched off from the closed state, if the opening of the auxiliary switch is delayed, the circuit is switched off by the delay relay, and the current of the data acquisition card sampling coil is transmitted to the upper computer.
3) The compression spring releases thrust under the action of the direct current motor, the pawl returns to the horizontal position under the action of the counter-force spring, the pawl returns to the vertical position under the action of self gravity and the spring, the whole mechanism resets, and the compression spring provides the thrust to tightly push the pawl to wait for next action.
4) And (3) repeating the steps 2) and 3) according to the switching-on and switching-off times set by the upper computer.
As shown in fig. 4, the switching-on/off coil control circuit part mainly comprises a power supply, a relay, a manual button, a resistor, a time relay and a switching-on/off coil;
the power supply is obtained by 220V single-phase alternating current rectification and filtering; the relay and the manual switch can be connected or disconnected with the circuit; the time relay contact is a normally closed contact, and is disconnected after delaying for 300ms, so that the coil is prevented from being burnt down due to overlong power-on time.
The direct current power supply required by the experiment is composed of 220V single-phase alternating current, an alternating current voltage regulator and a rectification filter circuit, and the output direct current power supply is continuously adjustable from 0V to 250V.
Specifically, the sensor assembly 1 includes a vibration sensor 101, a hall current sensor 102, and an angular displacement sensor 103; the signal output end of the vibration sensor 101, the signal output end of the hall current sensor 102 and the signal output end of the angular displacement sensor 103 are respectively connected with the sensor interfaces 203 in a one-to-one correspondence manner;
the vibration sensor 101 is used for collecting vibration signals generated by contact collision in the opening and closing processes of the circuit breaker;
the Hall current sensor 102 is used for collecting current signals of the opening and closing coils when the circuit breaker operates;
the angular displacement sensor 103 is used for collecting a circuit breaker contact stroke signal.
The hall current sensor 102 is selected in view of nominal measurement current, turns ratio, linearity range, response time, etc., and requires that the current sensor respond quickly enough and that the coil current does not exceed 10A. The Hall current sensor 102 in the embodiment of the invention adopts a single-turn through type 1:1000 zero-flux Hall current sensor, can electrically isolate the main circuit of the circuit breaker from the mechanical state sensing device 2 of the circuit breaker, has better performance than a common mutual inductance winding, and has the advantages of high response speed, high precision and good stability.
The angular displacement sensor 103 should be selected mainly in terms of linearity, output smoothness, response speed, and the like. Since the circuit breaker is a snap-action device, the sensor should have a high sensitivity; the opening distance of the breaker contact is generally in the millimeter level, so that the requirements on the linearity and consistency of the sensor are high.
The frequency range of vibration signals generated by contact collision in the switching-on and switching-off process of the circuit breaker is about 2.5-5 kHz and cannot exceed 10kHz, and according to the model selection reference method, the installation resonant frequency of the vibration sensor 101 should not exceed 30 kHz.
A display control module 204 and a main control chip 205 are integrated in the circuit breaker mechanical state sensing device 2; an RTOS system program is loaded in the main control chip 205; the display control module 204 is electrically connected with the display 3; the main control chip 205 is electrically connected to the sensor interface 203 and the display control module 204, respectively. The software loaded by the main control chip 205 adopts a Real Time Operating System (RTOS) which is completely developed and maintained by a domestic team, and the Real-Time meaning of the System is that an external event is correctly and timely responded within Time constraint, and during the period, data analysis, calculation and other work can be completed inside the System; while outside the time constraints, the system may idle to accomplish other free tasks.
The main control chip 205 analyzes and processes the status signals acquired by each sensor assembly 1, acquires key information and performs parameter calculation, and simultaneously performs man-machine interaction on the result and a display through an RS-485 bus to complete functions of liquid crystal display, fault alarm and the like. Data generated in the operation process of the main control chip 205 can be arranged into icons or curves through the display 3 to be displayed, and the test state of the circuit breaker can be displayed constantly.
In one embodiment, further comprises a busbar 5; the circuit breaker mechanical state sensing device is also provided with a busbar interface 206; one end of the busbar 5 is connected with the busbar interface 206, and the other end is connected with other experimental equipment; the main control chip 205 acquires relevant data of other experimental devices through the busbar 5. The arrangement of the busbar 5 can realize the connection between the circuit breaker mechanical state sensing device 2 and other experimental equipment (such as a switch cabinet) and obtain various test data.
An LED indicator lamp 301 is embedded in the display 3; the LED indicator lamp 301 is used for sending corresponding indication signals to the working state, the communication state and the fault state of the display 3.
In the actual operation process, due to the self service life limitation, power consumption and other reasons of the liquid crystal display of the display 3, the display needs to be in a black screen standby state most of the time, so that the LED indicator lamp 301 needs to be matched with the current operation state of the display 3, including the self state of the monitoring device, the working state of the electrical equipment, the communication state and the like, and sends an indication signal when the electrical equipment fails.
In one embodiment, the sensor assembly 1 further comprises an infrared sensor 104; the circuit breaker mechanical state sensing device 2 is internally integrated with a temperature monitoring module 207 and an alarm module 208; the signal input end of the infrared sensor 104 is connected with the corresponding detection node of the circuit breaker opening and closing coil current acquisition test platform, and the signal output end is electrically connected with the temperature monitoring module 207; the alarm module 208 is electrically connected with the temperature monitoring module 207;
the temperature monitoring module 207 is configured to analyze temperature data of each detection node, and trigger the alarm module 208 to issue an alarm when the temperature data exceeds a threshold.
After the temperature monitoring module 207 receives the temperature data transmitted from the infrared sensor 104, the temperature data needs to be processed and analyzed, and a specific temperature data processing algorithm is included in the process of processing the data. For example, an intuitive threshold method is selected to process and analyze the temperature data transmitted by the detection node, and if the received temperature data value is higher than a preset threshold, an instruction is sent to perform an alarm action.
In other embodiments, a mobile terminal 6 is also included; a wireless communication module 209 is integrated in the circuit breaker mechanical state sensing device 2; the main control chip 205 wirelessly communicates with the mobile terminal 6 through the wireless communication module 209. The wireless communication module 209 is a 5g communication module, a ZigBee module, a WiFi module or a bluetooth module. The diagnosis result generated by the main control chip 205 can be uploaded to the mobile terminal 6 in real time, and the worker can know the current state of the circuit breaker at any time.
The main control chip 205 acquires a plurality of groups of opening and closing coil current signals, contact travel signals and vibration signals under different fault states through the sensor interface 203, extracts characteristic parameters, screens the characteristic parameters by using a principal component analysis method, fuses different types of characteristic parameters, and establishes a characteristic parameter sample library under the normal state and the fault state of the opening and closing coil; and classifying and judging the current fault state by using the support vector machine optimized by the artificial intelligence algorithm and combining the characteristic parameter sample library.
As shown in fig. 2, the specific process of diagnosing the fault in the present invention is as follows:
simulating relevant actions of the circuit breaker by using a circuit breaker opening and closing coil current acquisition test platform;
collecting vibration signals generated by contact collision in the opening and closing processes of the circuit breaker by using a vibration sensor; processing the vibration signal by adopting a short-time energy method, and determining the just-in-just-out time;
collecting a circuit breaker contact stroke signal by using an angular displacement sensor, preprocessing the circuit breaker contact stroke signal, and converting the preprocessed circuit breaker contact stroke signal into linear displacement by using a table look-up method;
collecting current signals of a switching-on and switching-off coil when the circuit breaker operates by using a Hall current sensor, and determining an action starting moment;
the main control chip calculates the parameters to obtain mechanical parameters such as opening and closing time, just opening and just closing time, stroke, over travel and the like; classifying and judging the current fault state of the circuit breaker by using a support vector machine in combination with the currently acquired mechanical parameters;
and outputting the diagnosis result.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a circuit breaker divide-shut brake coil state on-line monitoring and intelligent evaluation system which characterized in that includes: the circuit breaker comprises a sensor assembly, a circuit breaker mechanical state sensing device, a display and a three-way isolation power supply; the mechanical state sensing device of the circuit breaker is provided with a display interface, a power supply interface and a plurality of sensor interfaces;
the signal input ends of the sensor assemblies are respectively and electrically connected with the relevant detection nodes of the current collection test platform of the opening and closing coil of the circuit breaker, and the signal output ends of the sensor assemblies are respectively and electrically connected with the sensor interfaces in a one-to-one correspondence manner; the display is electrically connected with the display interface; the three isolated power supplies are electrically connected with the power interface;
the sensor assembly is used for acquiring opening and closing coil current signals, contact travel signals and vibration signals of the circuit breaker opening and closing coil current acquisition test platform under different fault states of the simulated circuit breaker;
the circuit breaker mechanical state sensing device is used for extracting characteristic parameters of current signals, contact travel signals and vibration signals of the opening and closing coils, analyzing relative changes and change reasons between the characteristic parameters in each fault state and the characteristic parameters in a normal state, and classifying and judging faults by using a support vector machine;
the display is used for displaying the classification judgment result of the mechanical state sensing device of the circuit breaker on the current fault.
2. The on-line monitoring and intelligent evaluation system for the state of the opening and closing coils of the circuit breaker according to claim 1, wherein the sensor assembly comprises a vibration sensor, a Hall current sensor and an angular displacement sensor; the signal output end of the vibration sensor, the signal output end of the Hall current sensor and the signal output end of the angular displacement sensor are respectively connected with the sensor interfaces in a one-to-one correspondence manner;
the vibration sensor is used for collecting vibration signals generated by contact collision in the opening and closing processes of the circuit breaker;
the Hall current sensor is used for collecting current signals of the opening and closing coils when the circuit breaker operates;
the angular displacement sensor is used for acquiring a circuit breaker contact stroke signal.
3. The on-line monitoring and intelligent evaluation system for the state of the opening and closing coil of the circuit breaker according to claim 1, wherein a display control module and a main control chip are integrated in the mechanical state sensing device of the circuit breaker; an RTOS system program is loaded in the main control chip; the display control module is electrically connected with the display; the main control chip is electrically connected with the sensor interface and the display control module respectively.
4. The on-line monitoring and intelligent evaluation system for the state of the opening and closing coil of the circuit breaker according to claim 3, characterized by further comprising a busbar; the circuit breaker mechanical state sensing device is also provided with a busbar interface; one end of the busbar is connected with the busbar interface, and the other end of the busbar is connected with other experimental equipment; and the main control chip acquires relevant data of other experimental equipment through the busbar.
5. The on-line monitoring and intelligent evaluation system for the state of the opening and closing coil of the circuit breaker according to claim 3, characterized in that the main control chip acquires a plurality of groups of opening and closing coil current signals, contact travel signals and vibration signals under different fault states through the sensor interface, extracts characteristic parameters, screens the characteristic parameters by using a principal component analysis method, fuses different types of characteristic parameters, and establishes a characteristic parameter sample library under the normal state and the fault state of the opening and closing coil; and classifying and judging the current fault state by combining the feature parameter sample library with the support vector machine optimized by the artificial intelligence algorithm.
6. The on-line monitoring and intelligent evaluation system for the state of the opening and closing coil of the circuit breaker according to claim 1, wherein an LED indicator lamp is embedded in the display; the LED indicator light is used for sending corresponding indication signals to the working state, the communication state and the fault state of the display.
7. The on-line monitoring and intelligent evaluation system for the state of the opening and closing coil of the circuit breaker according to claim 1, wherein the sensor assembly further comprises an infrared sensor; a temperature monitoring module and an alarm module are integrated in the mechanical state sensing device of the circuit breaker; the signal input end of the infrared sensor is connected with the corresponding detection node of the current collection test platform of the opening and closing coil of the circuit breaker, and the signal output end of the infrared sensor is electrically connected with the temperature monitoring module; the alarm module is electrically connected with the temperature monitoring module;
the temperature monitoring module is used for analyzing the temperature data of each detection node and triggering the alarm module to give an alarm when the temperature data exceeds a threshold value.
8. The on-line monitoring and intelligent evaluation system for the state of the opening and closing coil of the circuit breaker according to claim 3, characterized by further comprising a mobile terminal; a wireless communication module is integrated in the mechanical state sensing device of the circuit breaker; the main control chip is in wireless communication with the mobile terminal through the wireless communication module.
9. The on-line monitoring and intelligent evaluation system for the state of the opening and closing coil of the circuit breaker according to claim 8, wherein the wireless communication module is a 5g communication module, a ZigBee module, a WiFi module or a Bluetooth module.
10. The on-line monitoring and intelligent evaluation system for the state of the opening and closing coil of the circuit breaker according to claim 1, wherein the display is connected with the display interface through an RS485 bus.
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