High-voltage circuit breaker non-contact detection system and method

Abstract

The invention relates to the technical field of circuit breaker detection, and discloses a non-contact detection system and method for a high-voltage circuit breaker, and the system comprises the steps: firstly, enabling a laser sensor to be aligned with a circuit breaker switching gate of the high-voltage circuit breaker, then enabling the laser sensor to emit laser, and carrying out the data collection of the switching-on and switching-off speeds of the circuit breaker switching gate; then analyzing the collected data, and calculating the switching-on speed and the switching-off speed of a switch of the circuit breaker; setting a threshold value for the calculated data, comparing a numerical value after each calculation with the threshold value, and comparing according to a calculated result; if the numerical value of the speed is larger than or lower than the threshold value, early warning is carried out, and early warning information is sent through an early warning device. According to the invention, the measurement of the just-opening speed, the just-closing speed, the average speed and the maximum speed of the high-voltage circuit breaker switch is completed. Operation is simple, learning operation time is shortened, and misoperation and mistaken setting are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breaker detection, and in particular to a non-contact detection system and method for a high-voltage circuit breaker. Background Art

[0002] With the development of society, people have higher and higher requirements for the safety and reliability of electricity use. High-voltage circuit breakers are the most important switching equipment in the power system. They bear the dual tasks of control and protection in the power system, and play a very important role in maintaining the safety, economy and reliable operation of the power system. The quality of its performance is directly related to the safe operation of the power system. High-voltage circuit breakers are generally composed of five parts: contacts, arc extinguishing chambers, insulating media, shell structures and motion mechanisms. Mechanical characteristic parameters are one of the important parameters for judging the performance of circuit breakers. The speed test of high-voltage circuit breakers has long been regarded as a difficulty in the field of mechanical characteristic testing of circuit breakers. The speed parameter is an important evaluation parameter for the quality of circuit breakers. It can directly reflect the mechanical coordination, electrical coordination and performance of circuit breakers in the most direct way, but the difficulty of on-site detection also leads to this parameter not playing a role in the defect analysis of circuit breakers.

[0003] In recent years, the design of high-voltage circuit breakers and GIS combination electrical appliances has become more and more compact, the size has become smaller and smaller, and the integration has become higher and higher, which has made the position of high-voltage circuit breakers for speed measurement narrower and narrower. Speed ​​sensors and fixed brackets are not easy to install or there is no place to install them. Therefore, speed measurement has become a more difficult problem. In addition, due to the limitation of the detection accuracy of existing sensors, the speed measurement calculation is the average value, not the actual instantaneous value, which will lead to deviation.

[0004] High-voltage circuit breakers are the most important switchgear in power systems. They are responsible for both control and protection. Mechanical characteristic parameters are one of the important parameters for judging circuit breaker performance. Speed ​​parameters are an important evaluation parameter for circuit breaker quality, which can directly reflect the mechanical coordination, electrical coordination and performance of circuit breakers.

[0005] The speed test of high-voltage circuit breakers has long been considered a difficult point in the mechanical characteristic test of circuit breakers. The difficulty of on-site detection has resulted in this parameter not being used in circuit breaker defect analysis.

[0006] The opening and closing speed of high-voltage circuit breakers currently on the market is one of the important factors affecting the breaking performance of circuit breakers;

[0007] If the opening and closing speed is too fast, the circuit breaker operating mechanism and transmission components will exceed the mechanical force they can withstand, causing damage to the buffer and shortening the service life of the circuit breaker; if the opening speed is too slow, the normal operating current or fault current cannot be quickly cut off, which will prolong the arcing time between the contacts and cause hazards such as contact burning or even arc extinguishing chamber explosion; if the closing speed is too slow, when the circuit breaker is closed on a short-circuit fault, it may not be able to overcome the effect of the contact closing electromotive force, thereby causing contact vibration or movement stagnation, and then causing contact burning or arc extinguishing chamber explosion.

[0008] The speed parameter is an important evaluation parameter for the quality of circuit breakers, which directly reflects the mechanical coordination, electrical coordination and performance of the circuit breaker. The speed test of high-voltage circuit breakers is a difficult point in the field of mechanical characteristic testing of circuit breakers.

[0009] Existing speed sensors are all contact sensors, mainly linear resistance sensors, rotary resistance sensors, rotary grating sensors, and acceleration sensors. These sensors need to be installed on the crank arm of the high-voltage circuit breaker mechanism box or the crank arm of the transmission connecting rod. The installation conditions are relatively harsh, otherwise there will be problems such as inaccurate speed measurement or no speed curve.

[0010] Existing sensors are prone to bumping or collision during testing, and once they hit the switch body, they can easily cause safety risks to the switch.

[0011] Therefore, in view of the above problems, a non-contact detection system and method for high-voltage circuit breaker is needed. Summary of the invention

[0012] The purpose of the present invention is to provide a non-contact detection system and method for high-voltage circuit breakers. The present invention develops a laser non-contact speed sensor, which is easy to install, will not hit the switch body, and is extremely safe. The measurement of the opening speed, closing speed, average speed, and maximum speed of the high-voltage circuit breaker switch can be completed. The operation is simple, the learning operation time is reduced, and misoperation and missetting are reduced, and the practicability is strong. It provides an accurate basis for the maintenance of high-voltage circuit breakers, ensures the opening speed of the circuit breaker through timely maintenance, and rapid disconnection can directly reduce the harm of circuit faults to the system and equipment. When the current is abnormal, the fault circuit can be quickly disconnected to block the abnormal current and reduce unnecessary economic losses.

[0013] The present invention is implemented in this way. The present invention provides a non-contact detection method for a high-voltage circuit breaker, which is specifically performed according to the following steps:

[0014] S1: First, the laser sensor is used to align the circuit breaker switch of the high-voltage circuit breaker, and then the laser sensor emits a laser to collect data on the closing and opening speeds of the circuit breaker switch;

[0015] S2: Then analyze the collected data and calculate the speed of closing and opening the circuit breaker;

[0016] The laser sensor emits a laser and irradiates it on the circuit breaker switch of the high-voltage circuit breaker. After diffuse reflection, it is determined whether there is a diffuse reflection light source reflected to the reflected light CCD detection module of the laser sensor;

[0017] If reflected light is reflected onto the reflected light CCD detection module of the laser sensor, the speed and position changes of the reflected light can be detected, and the closing or opening speed of the circuit breaker can be measured.

[0018] Furthermore, the measurement of closing or opening speed is as follows:

[0019] First, the vertical distances a, b, L and M between the laser sensor and the circuit breaker switch are measured by the laser sensor, and the x, y and horizontal displacement distance Δd' are calculated, as shown in equations (1) to (3);

[0020]

[0021] Δd′=yx (3)

[0022] Before calculating the speed of the data collected by the laser sensor, the laser signal error correction is performed on the data collected by the laser sensor;

[0023] Integrate the multiple sets of data collected, and integrate the first distance value and the first diffuse reflection position information included in each set of detection data. The first diffuse reflection position information is the light spot formed after the laser sensor to be calibrated emits laser to the measuring device and the collected laser is reflected by the receiving end of the laser sensor;

[0024] According to the multiple sets of detection data, a mapping function between the position information of the first diffuse reflection and the position information of the first light spot is determined, and the laser ranging sensor is calibrated by the mapping function, as shown in formula (4);

[0025] P=aD+b+∈ Formula (4)

[0026] Wherein, P is the position information of the first diffuse reflection, including the pixel position;

[0027] D is the first distance value, meters or centimeters;

[0028] a and b are regression coefficients, describing the linear relationship between distance and position;

[0029] ∈ is the error term, which represents the difference between the model and the actual data;

[0030] When new laser data is collected, the original data is corrected using the determined mapping function to obtain more accurate measurement results.

[0031] S3: setting a threshold for the calculated data, comparing the value after each calculation with the threshold, and comparing according to the calculated results;

[0032] S4: If the speed value is greater than or lower than the threshold, an early warning is issued and an early warning message is sent through the early warning device.

[0033] Furthermore, the present invention provides a non-contact detection system for high-voltage circuit breakers, including a data acquisition module for collecting data on laser information emitted by a laser sensor;

[0034] The data calculation module calculates the speed of opening and closing the circuit breaker switch based on the collected data;

[0035] The data sending module sends the calculated data to the monitoring end through the data sending module;

[0036] The data storage module includes a monitoring terminal, a server is provided at the monitoring terminal, the server is connected to a PC terminal, and is wirelessly connected to an intelligent terminal;

[0037] The data warning module will issue a data warning through a smart terminal, an audio and video warning device, or a pop-up window on the PC when the calculated data exceeds the threshold.

[0038] Furthermore, the data sending module includes a communication device connected to the control processing unit in the data calculation module, the communication device is a wired network card or a wireless communication device, and the wireless communication device is a 4G DTU, 5G DTU, Wifi unit or Lora unit. The smart terminal is a smart phone or a tablet computer, and there is at least one smart terminal.

[0039] The data calculation module uses a control processing unit to calculate the data, and the control processing unit uses an Arm 7 type control processing unit.

[0040] The data storage module also includes an online data storage module connected to the server, and an offline data storage module. When a failure occurs in the data sending module, the data calculated by the offline data storage module is stored offline.

[0041] Furthermore, the present invention provides a computer-readable storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a main controller, the method described in any one of the above is implemented.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1. It meets the requirements of the circuit breaker speed measurement in the power grid test regulations, overcomes the speed measurement bottleneck of the intelligent development of high-voltage circuit breakers to a certain extent, and solves the problems existing in the current high-voltage circuit breaker opening and closing speed test. The laser sensor and analysis are intelligent, simple and practical, which can well solve the problem of difficult installation of traditional high-voltage circuit breaker speed measurement sensors, making mechanical characteristic tests simpler. At the same time, the test personnel can save a lot of time for operation learning, reduce the probability of misoperation and missetting, and improve the accuracy of the test.

[0044] 2. Provide accurate basis for the maintenance of high-voltage circuit breakers. Ensure the opening speed of circuit breakers through timely maintenance. Rapid disconnection can directly reduce the harm of circuit faults to systems and equipment. When the current is abnormal, the faulty circuit can be quickly disconnected to block abnormal current and reduce unnecessary economic losses. When a fault occurs, the longer the disconnection time, the more serious the damage to the power system equipment. Generally, there are two feeder ends that serve as backup for each other in the circuit system. When one line fails, it is immediately switched to the backup line. Every extension of 1ms during this period will cause millions of yuan in losses. Therefore, accurate detection data and timely maintenance are of great significance to reducing economic losses. On the other hand, the service life of high-voltage circuit breakers can be extended by accurately detecting the speed of just opening and just closing. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 It is a schematic flow chart of the method of the present invention;

[0047] Figure 2 It is a schematic diagram of the laser speed measurement principle of the present invention;

[0048] Figure 3 It is a schematic diagram of the equivalent geometry of the laser velocity measurement of the present invention. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0050] In this embodiment, please refer to Figure 1-Figure 3 The present invention provides a non-contact detection method for a high-voltage circuit breaker, which is specifically performed in the following steps:

[0051] S1: First, the laser sensor is used to align the circuit breaker switch of the high-voltage circuit breaker, and then the laser sensor emits a laser to collect data on the closing and opening speeds of the circuit breaker switch;

[0052] S2: Then analyze the collected data and calculate the speed of closing and opening the circuit breaker;

[0053] The laser sensor emits a laser and irradiates it on the circuit breaker switch of the high-voltage circuit breaker. After diffuse reflection, it is determined whether there is a diffuse reflection light source reflected to the reflected light CCD detection module of the laser sensor;

[0054] If reflected light is reflected onto the reflected light CCD detection module of the laser sensor, the speed and position changes of the reflected light can be detected, and the closing or opening speed of the circuit breaker can be measured.

[0055] Furthermore, the measurement of closing or opening speed is as follows:

[0056] First, the vertical distances a, b, L and M between the laser sensor and the circuit breaker switch are measured by the laser sensor, and the x, y and horizontal displacement distance Δd' are calculated, as shown in equations (1) to (3);

[0057]

[0058] Δd′=yx (3)

[0059] Before calculating the speed of the data collected by the laser sensor, the laser signal error correction is performed on the data collected by the laser sensor;

[0060] Integrate the multiple sets of data collected, and integrate the first distance value and the first diffuse reflection position information included in each set of detection data. The first diffuse reflection position information is the light spot formed after the laser sensor to be calibrated emits laser to the measuring device and the collected laser is reflected by the receiving end of the laser sensor;

[0061] According to the multiple sets of detection data, a mapping function between the position information of the first diffuse reflection and the position information of the first light spot is determined, and the laser ranging sensor is calibrated by the mapping function, as shown in formula (4);

[0062] P=aD+b+∈ Formula (4)

[0063] Wherein, P is the position information of the first diffuse reflection, including the pixel position;

[0064] D is the first distance value, meters or centimeters;

[0065] a and b are regression coefficients, describing the linear relationship between distance and position;

[0066] ∈ is the error term, which represents the difference between the model and the actual data;

[0067] When new laser data is collected, the original data is corrected using the determined mapping function to obtain more accurate measurement results.

[0068] S3: setting a threshold for the calculated data, comparing the value after each calculation with the threshold, and comparing according to the calculated results;

[0069] S4: If the speed value is greater than or lower than the threshold, an early warning is issued and an early warning message is sent through the early warning device.

[0070] Furthermore, the present invention provides a non-contact detection system for high-voltage circuit breakers, including a data acquisition module for collecting data on laser information emitted by a laser sensor;

[0071] The data calculation module calculates the speed of opening and closing the circuit breaker switch based on the collected data;

[0072] The data sending module sends the calculated data to the monitoring end through the data sending module;

[0073] The data storage module includes a monitoring terminal, a server is provided at the monitoring terminal, the server is connected to a PC terminal, and is wirelessly connected to an intelligent terminal;

[0074] The data warning module will issue a data warning through a smart terminal, an audio and video warning device, or a pop-up window on the PC when the calculated data exceeds the threshold.

[0075] In this embodiment, the data sending module includes a communication device connected to the control processing unit in the data calculation module, the communication device is a wired network card or a wireless communication device, and the wireless communication device is a 4G DTU, 5G DTU, Wifi unit or Lora unit. The smart terminal is a smart phone or a tablet computer, and there is at least one smart terminal.

[0076] The data calculation module uses a control processing unit to calculate the data, and the control processing unit uses an Arm 7 type control processing unit.

[0077] The data storage module also includes an online data storage module connected to the server, and an offline data storage module. When a failure occurs in the data sending module, the data calculated by the offline data storage module is stored offline.

[0078] In this embodiment, the present invention provides a computer-readable storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a main controller, the method described in any one of the above is implemented.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A non-contact detection method for a high-voltage circuit breaker, characterized in that: Please follow the steps below: S1: First, the laser sensor is used to align the circuit breaker switch of the high-voltage circuit breaker, and then the laser sensor emits a laser to collect data on the closing and opening speeds of the circuit breaker switch; S2: Then analyze the collected data and calculate the speed of closing and opening the circuit breaker; S3: setting a threshold for the calculated data, comparing the value after each calculation with the threshold, and comparing according to the calculated results; S4: If the speed value is greater than or lower than the threshold, an early warning is issued and an early warning message is sent through the early warning device.

2. A high voltage circuit breaker non-contact detection system and method according to claim 1, characterized in that: In step S2, a laser is emitted by a laser sensor and irradiated on the circuit breaker switch of the high-voltage circuit breaker. After diffuse reflection, it is determined whether there is a diffuse reflection light source reflected to the reflected light CCD detection module of the laser sensor; If reflected light is reflected onto the reflected light CCD detection module of the laser sensor, the speed and position changes of the reflected light can be detected, and the closing or opening speed of the circuit breaker can be measured.

3. A high voltage circuit breaker non-contact detection system and method according to claim 2, characterized in that: The measurement of closing or opening speed is as follows: First, the vertical distances a, b, L and M between the laser sensor and the circuit breaker switch are measured by the laser sensor, and the x, y and horizontal displacement distance Δd' are calculated, as shown in equations (1) to (3); Δd′=yx (3).

4. A high voltage circuit breaker non-contact detection system and method according to claim 2, characterized in that: Before calculating the speed of the data collected by the laser sensor, the laser signal error correction is performed on the data collected by the laser sensor; S4.1: Integrate the multiple sets of data collected, and integrate the first distance value and the position information of the first diffuse reflection included in each set of detection data, where the position information of the first diffuse reflection is the light spot formed after the laser sensor to be calibrated emits laser to the measuring device and the collected laser is reflected by the receiving end of the laser sensor; S4.2: Determine a mapping function between the position information of the first diffuse reflection and the position information of the first light spot according to the multiple sets of detection data, and calibrate the laser ranging sensor by the mapping function, as shown in formula (4); P=aD+b+∈ Formula (4) Wherein, P is the position information of the first diffuse reflection, including the pixel position; D is the first distance value, meters or centimeters; a and b are regression coefficients, describing the linear relationship between distance and position; ∈ is the error term, which represents the difference between the model and the actual data; S4.3: When new laser data is collected, the original data is corrected using the determined mapping function to obtain a more accurate measurement result.

5. A non-contact detection system for high-voltage circuit breakers, characterized in that: It includes a data acquisition module for collecting data on laser information emitted by the laser sensor; The data calculation module calculates the speed of opening and closing the circuit breaker switch based on the collected data; The data sending module sends the calculated data to the monitoring end through the data sending module; The data storage module includes a monitoring terminal, a server is provided at the monitoring terminal, the server is connected to a PC terminal, and is wirelessly connected to an intelligent terminal; The data warning module will issue a data warning through a smart terminal, an audio and video warning device, or a pop-up window on the PC when the calculated data exceeds the threshold.

6. A non-contact detection system for high-voltage circuit breaker according to claim 5, characterized in that: The data sending module includes a communication device connected to the control processing unit in the data calculation module, wherein the communication device is a wired network card or a wireless communication device, and the wireless communication device is a 4G DTU, 5G DTU, Wifi unit or Lora unit.

7. A non-contact detection system for high-voltage circuit breaker according to claim 5, characterized in that: The smart terminal is a smart phone or a tablet computer, and there is at least one smart terminal.

8. A non-contact detection system for high-voltage circuit breaker according to claim 5, characterized in that: The data calculation module uses a control processing unit to calculate the data, and the control processing unit uses an Arm 7 type control processing unit.

9. A non-contact detection system for high-voltage circuit breaker according to claim 5, characterized in that: The data storage module also includes an online data storage module connected to the server, and an offline data storage module. When a failure occurs in the data sending module, the data calculated by the offline data storage module is stored offline.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by the main controller, the method according to any one of claims 1 to 4 is implemented.

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