On-line monitoring carbon brush and carbon brush on-line monitoring system

Abstract

The invention relates to the technical field of carbon brush on-line monitoring, in particular to an on-line monitoring carbon brush and a carbon brush on-line monitoring system.The on-line monitoring carbon brush comprises an on-line monitoring carbon brush body and further comprises a temperature collecting module, an on-line monitoring module and an on-line monitoring module, the contact acquisition module is used for acquiring the contact force of the carbon brush; the data transmission module is used for transmitting data; and the interaction module is used for displaying the temperature information acquired by the temperature acquisition module and the contact force acquired by the contact acquisition module in a data form for the operation and maintenance personnel to call, and judging whether to give an alarm to the operation and maintenance personnel according to the temperature information acquired by the temperature acquisition module and the contact force information acquired by the contact acquisition module. When parameters such as the temperature, the contact condition and the abrasion condition of the carbon brush are monitored to reach a user-defined warning limit, an alarm prompt is given, so that a user can know that the operation of the carbon brush is abnormal in time, and when the carbon brush is normally operated and the temperature is normal, people do not need to supervise the carbon brush constantly, and the labor cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of carbon brush online monitoring, in particular to an online monitoring carbon brush and a carbon brush online monitoring system. Background Art

[0002] Carbon brushes are widely used in many electrical equipment as a sliding contact. When used in generator sets, they are the weak link in the operation of generators as a device for transferring energy between the fixed part and the rotating part of the generator excitation system. The stability of their operation affects the safe operation of the generator.

[0003] At present, many hydropower companies in my country still use manual handheld infrared thermometer inspections to monitor the temperature of carbon brushes. The main disadvantages of this application are as follows: ① The infrared non-contact temperature measurement result is the average temperature of the measured surface area, which cannot accurately locate the heating carbon brush; ② Infrared temperature measurement is easily affected by dust, water vapor, different surface emissivity of objects, etc., and the temperature measurement accuracy is not high, which cannot reflect the true temperature of the carbon brush; ③ The manual inspection results have a lag, and the temperature of the carbon brush cannot be monitored in real time; ④ When the number of generator carbon brushes is large, the inspection takes a lot of time, which increases the operation and maintenance cost;

[0004] Some power plants also use electrical temperature sensors for temperature monitoring, but the sensors have low reliability, are severely affected by electromagnetic interference, and frequently experience false and erroneous temperature measurements.

[0005] To this end, the present invention proposes an online monitoring carbon brush and an online monitoring system for a carbon brush. Summary of the invention

[0006] In view of the above problems or problems existing in the prior art, the present invention is proposed.

[0007] Therefore, an object of the present invention is to provide an online monitoring carbon brush.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: an online monitoring carbon brush, comprising:

[0009] An optical temperature sensor is arranged on the carbon brush.

[0010] As a preferred solution for online monitoring of carbon brushes of the present invention, a gallium arsenide temperature sensor is arranged on the carbon brush.

[0011] As a preferred solution for online monitoring of carbon brushes of the present invention, a contact sensor is arranged at the end of the carbon brush.

[0012] Beneficial effects of the online monitoring of carbon brushes of the present invention: the present invention can solve the problem of inaccurate non-contact temperature measurement by setting an optical temperature sensor, has low operation and maintenance costs, and is convenient for real-time temperature monitoring of carbon brushes.

[0013] In order to solve the above technical problems, the present invention also provides the following technical solutions: a carbon brush online monitoring system, including an online monitoring carbon brush, and also including:

[0014] A temperature acquisition module, which is used to collect the temperature of the carbon brush;

[0015] A contact collection module, which is used to collect the contact force of the carbon brush;

[0016] A data transmission module, which is used for data transmission;

[0017] The interactive module is used to display the temperature information collected by the temperature acquisition module and the contact force collected by the contact acquisition module in the form of data for the operation and maintenance personnel to call, and to determine whether to issue an alarm to the operation and maintenance personnel based on the temperature information collected by the temperature acquisition module and the contact force information collected by the contact acquisition module.

[0018] As a preferred solution of the carbon brush online monitoring system of the present invention, wherein: the interactive module includes:

[0019] A display module, which is used to display the temperature information collected by the temperature collection module and the contact force information collected by the contact collection module;

[0020] A storage module, which is used to store and record the information collected by the temperature collection module and the contact collection module;

[0021] The temperature pre-alarm module determines whether the carbon brush temperature is normal based on the temperature information collected by the temperature acquisition module, and issues an alarm if there is an abnormality;

[0022] The contact pre-alarm module determines whether the carbon brush contact is normal based on the contact force information collected by the contact acquisition module, and issues an alarm if there is any abnormality.

[0023] As a preferred solution of the carbon brush online monitoring system of the present invention, wherein: the interaction module also includes:

[0024] Communication module, which is used to realize remote communication and send alarms to operation and maintenance personnel;

[0025] A control module is used to remotely control the shutdown of the generator.

[0026] As a preferred solution of the carbon brush online monitoring system of the present invention, when the temperature information collected by the temperature collection module is too high or too low, and when the temperature difference between the carbon brushes is too large, the temperature pre-alarm module issues an alarm.

[0027] As a preferred solution of the carbon brush online monitoring system of the present invention, when the contact force collected by the contact collection module is too large or too low, and when the difference in contact force between carbon brushes is too large, the contact early alarm module issues an alarm.

[0028] As a preferred solution of the carbon brush online monitoring system of the present invention, when the temperature information collected by the temperature collection module is not between 60 and 80° C., the temperature pre-alarm module issues an alarm.

[0029] As a preferred solution of the carbon brush online monitoring system of the present invention, when the contact force collected by the contact collection module is lower than half of the initial contact force, the contact early alarm module issues an alarm.

[0030] The beneficial effects of the carbon brush online monitoring system of the present invention are as follows: when the parameters such as the carbon brush temperature, contact condition, and wear condition are monitored to reach the user-defined warning limit, an alarm prompt is issued, which helps the user to be informed in time when the carbon brush operation is abnormal. When the carbon brush operates normally and the temperature is normal, there is no need for personnel to supervise all the time, saving labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0032] Figure 1 Schematic diagram of the overall structure of online monitoring carbon brushes.

[0033] Figure 2 This is the framework diagram of the carbon brush online monitoring system.

[0034] Figure 3 This is the framework diagram of the interactive modules of the carbon brush online monitoring system. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0038] Example 1, reference Figure 1 , which is the first embodiment of the present invention, provides an online monitoring carbon brush, including setting an optical temperature sensor on the carbon brush.

[0039] In this embodiment, the fiber optic temperature measurement technology is divided into distributed fiber optic temperature measurement and point fiber optic temperature measurement, wherein the distributed fiber optic temperature measurement technology uses the nonlinear Raman effect in the optical fiber to detect the temperature information along the optical fiber direction. It has the concept of minimum spatial resolution. In the application, a section of optical fiber needs to be coiled into an optical fiber coil, which is large in size, complicated in installation process and has hidden dangers; the measurement cycle is long, the price is expensive, and the construction and debugging process are cumbersome, which is difficult to apply to the temperature measurement scenarios of generator sets and carbon brushes. Among them, there are three main point fiber optic temperature measurement technologies suitable for carbon brush temperature measurement: gallium arsenide fiber temperature measurement, fluorescent fiber temperature measurement and fiber Bragg grating temperature measurement.

[0040] Preferably, a gallium arsenide temperature sensor is provided on the carbon brush.

[0041] It should be noted that:

[0042] GaAs fiber temperature measurement: Based on the characteristic that the wavelength of light absorbed by GaAs crystal changes with temperature, the temperature is analyzed by monitoring the change of the wavelength of light returned from the crystal; the important feature of demodulation is the wavelength of light, which is not affected by the fiber transmission distance, so the fiber laying distance can be customized, the bending radius is small, and the construction is not easily damaged. The temperature sensing material is GaAs crystal, which is stable and highly consistent;

[0043] Fluorescent fiber temperature measurement: Based on the characteristic that the duration of light emission after fluorescent substances are excited by light is related to the ambient temperature, the temperature is analyzed by monitoring the intensity of the afterglow light energy returned by the fluorescent substances. Its temperature sensor is small in size and simple in process, but the important feature of its temperature demodulation is light intensity. Affected by the optical fiber transmission distance and switching, its switching optical fiber has certain limitations. The installation position of the temperature demodulator is also limited. It may be installed in a strong magnetic or high-voltage environment, affecting the performance of the equipment.

[0044] Fiber Bragg grating temperature measurement: Based on the thermal expansion and contraction of materials and the Bragg principle, a grid with a specific spacing is made on the optical fiber. When the ambient temperature changes, the grid spacing will cause the wavelength of the reflected light from the grid to change. Based on this principle, the temperature is analyzed by monitoring the return or by the change in the wavelength of the light. The important feature of demodulation is the spectrum, which is not affected by the fiber transmission distance, but the measurement result is easily affected by the deformation of the temperature sensing point. It can measure the temperature of multiple points, but the temperature sensing probe is easily affected by vibration, high temperature, stress and other environmental factors. The temperature measurement accuracy and working life are difficult to adapt to the carbon brush temperature measurement environment.

[0045] Considering the characteristics of the three fiber optic temperature measurement technologies, gallium arsenide fiber optic temperature measurement technology is the optimal solution for carbon brush temperature measurement.

[0046] Preferably, a contact sensor is provided at the end of the carbon brush.

[0047] When in use, the optical temperature sensor and contact sensor can display the real-time temperature and contact condition of the carbon brush, making it easier for operation and maintenance personnel to understand the status of the carbon brush.

[0048] The temperature sensor and contact sensor of this device are further explained in conjunction with the equipment in the generator set. Figure 1 The carbon brush is in a fitted state with the slip ring under the action of the carbon brush spring. The brush holder is arranged outside the carbon brush. The temperature sensor can be arranged at the root of the carbon brush. The advantage is that the collected temperature is more direct. Alternatively, the temperature sensor can be installed on the brush holder, which makes it easy to replace the carbon brush. The contact sensor is used for contact monitoring of the carbon brush contact condition. The contact sensor is installed at the root of the carbon brush spring. The contact condition between the carbon brush and the collector ring and the degree of carbon brush wear are monitored through the temperature, contact force and change trend.

[0049] In summary, the use of an integrated packaged GaAs fiber optic temperature sensor to achieve accurate contact temperature measurement of the carbon brush can solve the problem of inaccurate non-contact temperature measurement. GaAs fiber optic temperature sensors are inherently immune to electromagnetic interference and can withstand extreme working environments such as high voltage, high temperature, and high current. They are truly passive temperature sensors; their temperature-sensing material, GaAs crystals, are stable, their properties do not change over time, and their temperature sensing performance is not affected by vibration, high temperature, high pressure, and other environmental factors, achieving long-term accurate temperature measurement and a long working life, which is different from the temperature measurement performance of traditional electrical temperature sensors, which are easily affected by environmental interference and have a short working life.

[0050] Example 2, reference Figure 2-3 , which is the second embodiment of the present invention. Different from the previous embodiment, this embodiment proposes a carbon brush online monitoring system, including online monitoring of carbon brushes, and also includes,

[0051] The temperature acquisition module is used to collect the temperature of the carbon brush; in this embodiment, the temperature acquisition module is connected to the gallium arsenide temperature sensor.

[0052] The contact collection module is used to collect the contact force of the carbon brush; in this embodiment, the contact collection module is connected to the contact sensor.

[0053] The data transmission module is used for data transmission. In this embodiment, high temperature resistant quartz optical fiber is used as the optical transmission channel to improve the stability of data transmission.

[0054] The interactive module is used to display the temperature information collected by the temperature acquisition module and the contact force collected by the contact acquisition module in the form of data for the operation and maintenance personnel to call, and to determine whether to issue an alarm to the operation and maintenance personnel based on the temperature information collected by the temperature acquisition module and the contact force information collected by the contact acquisition module.

[0055] Specifically, the interaction modules include:

[0056] The display module is used to display the temperature information collected by the temperature collection module and the contact force information collected by the contact collection module; the operation and maintenance personnel can understand the working conditions of the carbon brush through the display module.

[0057] The storage module is used to store and record the information collected by the temperature acquisition module and the contact acquisition module; in this embodiment, the operation and maintenance personnel can view the records of the carbon brush status information in the storage module at any time to analyze the operation status of the carbon brush.

[0058] The temperature pre-alarm module determines whether the carbon brush temperature is normal based on the temperature information collected by the temperature acquisition module, and issues an alarm if there is an abnormality;

[0059] The contact pre-alarm module determines whether the carbon brush contact is normal based on the contact force information collected by the contact acquisition module, and issues an alarm if there is any abnormality.

[0060] Furthermore, the interaction module also includes:

[0061] The communication module is used to realize remote communication and send alarms to operation and maintenance personnel; the communication module receives information transmitted by the data transmission module through the Internet.

[0062] The control module is used to remotely control the shutdown of the generator. After the operation and maintenance personnel receive an abnormal alarm, they can remotely control the generator equipment to shut down through the control module to protect the equipment.

[0063] When the temperature information collected by the temperature acquisition module is too high or too low, and when the temperature difference between the carbon brushes is too large, the temperature pre-alarm module will sound an alarm, which can realize early warning monitoring of low and high temperatures.

[0064] When the contact force collected by the contact collection module is too large or too low, and when the difference in contact force between carbon brushes is too large, the contact early alarm module issues an alarm.

[0065] When the temperature information collected by the temperature acquisition module is not between 60 and 80°C, the temperature pre-alarm module will sound an alarm. As the temperature of the carbon brush rises, the resistance decreases, and it is the smallest at 80°C to 100°C. When the temperature exceeds 100°C, the contact resistance increases sharply. When the carbon brush is running, the brush body temperature should be controlled at no more than 80°C, and the current of each carbon brush is controlled at 20 to 100A. Therefore, setting the monitoring threshold between 60 and 80°C can ensure the normal operation of the carbon brush, improve the safety factor and protection effect, and reduce the occurrence of unit operation failures.

[0066] When the contact force collected by the contact collection module is lower than half of the initial contact force, the contact early alarm module issues an alarm.

[0067] The rest of the structure is the same as that of Example 1.

[0068] During use, according to the carbon brush temperature measurement and contact force change monitoring data, combined with previous operation and maintenance replacement experience, an appropriate carbon brush wear warning value can be set to remind personnel to replace the carbon brush.

[0069] In summary, when the carbon brush temperature, contact condition, wear condition and other parameters are monitored to reach the user-defined warning limit, an alarm prompt will be issued, which is conducive to the user to know in time when the carbon brush operation is abnormal. When the carbon brush is operating normally and the temperature is normal, there is no need for personnel to monitor it all the time, saving labor costs.

[0070] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An online monitoring carbon brush, characterized in that: include, An optical temperature sensor is arranged on the carbon brush.

2. The online monitoring carbon brush according to claim 1, characterized in that: A gallium arsenide temperature sensor is set on the carbon brush.

3. The online monitoring carbon brush according to claim 1 or 2, characterized in that: A contact sensor is provided at the end of the carbon brush.

4. A carbon brush online monitoring system, characterized in that: The online monitoring carbon brush according to any one of claims 1 to 3 further comprises: A temperature acquisition module, which is used to collect the temperature of the carbon brush; A contact collection module, which is used to collect the contact force of the carbon brush; A data transmission module, which is used for data transmission; The interactive module is used to display the temperature information collected by the temperature acquisition module and the contact force collected by the contact acquisition module in the form of data for the operation and maintenance personnel to call, and to determine whether to issue an alarm to the operation and maintenance personnel based on the temperature information collected by the temperature acquisition module and the contact force information collected by the contact acquisition module.

5. The carbon brush online monitoring system according to claim 4, characterized in that: The interaction module includes: A display module, which is used to display the temperature information collected by the temperature collection module and the contact force information collected by the contact collection module; A storage module, which is used to store and record the information collected by the temperature collection module and the contact collection module; The temperature pre-alarm module determines whether the carbon brush temperature is normal based on the temperature information collected by the temperature acquisition module, and issues an alarm if there is an abnormality; The contact pre-alarm module determines whether the carbon brush contact is normal based on the contact force information collected by the contact acquisition module, and issues an alarm if there is any abnormality.

6. The carbon brush online monitoring system according to claim 5, characterized in that: The interaction module also includes: Communication module, which is used to realize remote communication and send alarms to operation and maintenance personnel; A control module is used to remotely control the generator shutdown.

7. The carbon brush online monitoring system according to claim 6, characterized in that: When the temperature information collected by the temperature collection module is too high or too low, and when the temperature difference between the carbon brushes is too large, the temperature pre-alarm module issues an alarm.

8. The carbon brush online monitoring system according to claim 7, characterized in that: When the contact force collected by the contact collection module is too large or too low, and when the difference in contact force between carbon brushes is too large, the contact early alarm module issues an alarm.

9. The carbon brush online monitoring system according to claim 8, characterized in that: When the temperature information collected by the temperature collection module is not between 60 and 80° C., the temperature pre-alarm module issues an alarm.

10. The carbon brush online monitoring system according to claim 9, characterized in that: When the contact force collected by the contact collection module is lower than half of the initial contact force, the contact early alarm module issues an alarm.

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