CN110487417A - A kind of generator excitation carbon brush safety detection method and early warning system - Google Patents

A kind of generator excitation carbon brush safety detection method and early warning system Download PDF

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Publication number
CN110487417A
CN110487417A CN201910817099.7A CN201910817099A CN110487417A CN 110487417 A CN110487417 A CN 110487417A CN 201910817099 A CN201910817099 A CN 201910817099A CN 110487417 A CN110487417 A CN 110487417A
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China
Prior art keywords
carbon brush
generator
infrared temperature
excitation
thermal infrared
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Pending
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CN201910817099.7A
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Chinese (zh)
Inventor
张宁
彭静
宁心怡
皮月庆
张卫勇
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Shenzhen Dosoon Intelligent Electrical Technology Co Ltd
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Shenzhen Dosoon Intelligent Electrical Technology Co Ltd
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Priority to CN201910817099.7A priority Critical patent/CN110487417A/en
Publication of CN110487417A publication Critical patent/CN110487417A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00Radiation pyrometry, e.g. infrared or optical thermometry
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18Status alarms
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J2005/0077Imaging

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Motor Or Generator Current Collectors (AREA)

Abstract

The present invention relates to the technical fields of the excitation carbon brush safety detection of generator, disclose a kind of generator excitation carbon brush safety detection method, it realizes and Accurate Analysis, early warning is carried out to monitoring objective in real time, eliminate original detection mode due to haveing the shortcomings that dead angle, without trace analysis, precision is high, clearance measurement, personnel labor intensity are big, so that the security risk of the excitation carbon brush of generator has obtained comprehensive, early warning, to realize that wisdom power plant provides a kind of reliable bottom data basis;Infrared thermal imagery has successfully been applied to the excitation carbon brush monitoring of generator by the present invention, with computer technology, it realizes and draws carbon brush region on thermal imagery video, and the formation unique corresponding relation with physics carbon brush position, contactless smart detection is carried out to carbon brush, generator excited system stable operation monitoring capability is improved, Power Plant Accident is helped to improve and gives warning in advance ability, analysis level and response efficiency.

Description

Generator excitation carbon brush safety detection method and early warning system
Technical Field
The invention relates to the technical field of safety detection of an excitation carbon brush of a generator, in particular to a safety detection method and an early warning system of the excitation carbon brush of the generator.
Background
With the expansion of the scale of the power system, the appearance of a long-distance heavy-load power transmission line and the adoption of a large-scale generator, the damping of the whole power system is continuously weakened by a rapid excitation system consisting of a semiconductor excitation regulator and a thyristor rectification power cabinet. When a power system breaks down or is disturbed by other factors, low-frequency oscillation occurs for a long time, so that the generator excitation system breaks down and rises, the generator set cannot work normally, and great risk is brought to safe and stable operation of a large generator and a power grid. How to adopt effective measures to improve the stable operation of an excitation system becomes a problem which needs to be solved urgently by a power system.
When the generator is in operation, factors such as increased contact resistance of an excitation carbon brush, looseness of a brush holder, plug offset or low-frequency oscillation and the like cause overtemperature or ring fire at contact positions such as a magnetic brush terminal and the like to occur occasionally. In order to reduce the excitation failure rate, each component of the excitation system is usually arranged in a closed space, so that a worker cannot comprehensively and timely monitor and know the internal situation, cannot timely master the degradation situation of each component of the excitation system, often misses the best opportunity for processing safety abnormity, and accidents are caused.
At present, a DCS (distributed control system), an electrical monitoring system or a PMU (power management unit) device has no on-line monitoring function for the temperature of a carbon brush of an excitation system of a power plant unit, the temperature and the dust of a power cabinet, the temperature of an iron core of an excitation transformer, a cable connector and the like, and no means for directly measuring the stable operation parameters of components such as an excitation carbon brush of a generator and the like.
Disclosure of Invention
The invention aims to solve the problems and provides a generator excitation carbon brush safety detection method and an early warning system, which are used for carrying out online safety analysis and early warning on a power plant generator excitation carbon brush and improving the timeliness and early warning and pre-control capability of a power plant operation decision.
The invention is realized in such a way, and in a first aspect, the invention provides a safety detection method for an excitation carbon brush of a generator, which comprises the following steps:
the method comprises the following steps that a collection unit is selected, pixels of a thermal infrared temperature imaging unit and a field angle of the thermal infrared temperature imaging unit are calculated according to the diameter and the width of an excitation carbon brush and a slip ring of a generator, and the thermal infrared temperature imaging unit provided with a proper focal plane sensor and a proper thermal imaging lens is selected;
determining the number of the thermal infrared temperature imaging units, and estimating the number of the thermal infrared temperature imaging units to be used according to the number of the excitation carbon brushes of the generator and the arrangement mode of the brush handles;
determining the installation mode of the thermal infrared temperature imaging unit, so that all excitation carbon brushes can enter the field angle of the thermal infrared temperature imaging unit and the temperature of the excitation carbon brushes can be acquired;
the system comprises a thermal infrared temperature imaging unit, a pre-processor, a system host and a generator excitation brush ring, wherein the thermal infrared temperature imaging unit acquires thermal image data of the temperature of a generator excitation brush ring and a carbon brush of the generator excitation brush ring, and the pre-processor receives a thermal image data signal of the thermal infrared temperature imaging unit, processes the thermal image data signal and transmits the processed thermal image data signal to the system host;
the system host machine carries out comprehensive processing on the acquired thermal image data signals and respectively displays thermal image videos, electronic configuration diagrams and carbon brush maintenance record contents on the system host machine;
the system host provides a manual drawing partitioning tool, rectangular frames are drawn on a thermal image video picture according to brush handle display areas (all carbon brushes in each brush handle need to be contained in the rectangular frames), and the rectangular frames are named and numbered according to corresponding brush handle names;
the system host computer analyzes and calculates the temperature lattice in the rectangular frame to obtain the hot spot value and the fluctuation value, and tracks and analyzes the hot spot and the temperature fluctuation, once the temperature lattice occurs: a. the fluctuation value is continuously increased, the corresponding hot point value is synchronously and continuously increased, b, the hot point value exceeds the temperature early warning value, c, the hot point temperature difference between the brush handles is overlarge and exceeds one of the three conditions of the early warning value, and the system gives an alarm and outputs an alarm signal.
Further, still include: and the system host machine performs spare part and maintenance management on the excitation carbon brush.
In a second aspect, the invention provides a generator excitation and carbon brush safety early warning system, which comprises a thermal infrared temperature imaging unit, a mounting bracket, a front processor, a wireless communication module and a system host; wherein,
the thermal infrared temperature imaging unit is used for carrying out thermal imaging and temperature acquisition on the generator excitation carbon brush and comprises a thermal imaging detector, a lens, a baffle, a processing circuit and a communication circuit;
the mounting bracket comprises a fixed base, a supporting rod, a plurality of rocker arms and a communication line; the thermal infrared temperature imaging unit is mounted on the rocker arm.
The front processor is in wired connection with the thermal infrared temperature imaging units through a communication interface of the front processor, and one front processor can be in butt joint with a plurality of thermal infrared temperature imaging units to complete the processing and transmission of thermal image data of the thermal infrared temperature imaging units;
the wireless communication module comprises a wireless communication module route and a wireless communication module substation, the wireless communication module substation is connected with the preprocessor to complete preprocessing and communication functions, and a wireless local area network is established through the wireless communication module route to complete the communication functions of all the wireless communication modules of the system;
the system host is in routing connection with the wireless communication module to complete thermal image data acquisition, processing, storage, analysis, display, alarm and output functions of all the thermal infrared temperature imaging units.
Further, the front end processor and the wireless communication module are assembled in one device and are installed near the installation bracket.
Further, the front-end processor at least simultaneously processes thermal image data collected by 3 thermal infrared temperature imaging units.
Compared with the prior art, the safety detection method for the excitation carbon brush of the generator provided by the invention can be used for accurately analyzing and early warning a monitored target in real time, and overcomes the defects of dead angles, no tracking analysis, low precision, gap measurement and high labor intensity of personnel in the original detection mode, so that the potential safety hazard of the excitation carbon brush of the generator is comprehensively and early warned, and a reliable bottom data base is provided for realizing an intelligent power plant; according to the invention, infrared thermography is successfully applied to the excitation carbon brush monitoring of the generator, the carbon brush area is drawn on a thermal image video by using a computer technology, a unique corresponding relation is formed between the carbon brush area and the position of a physical carbon brush, and non-contact intelligent detection is carried out on the carbon brush, so that the stable operation monitoring capability of a generator excitation system is improved, and the early warning capability, the analysis level and the response efficiency of power plant accidents are improved.
Drawings
Fig. 1 is a flowchart of a method for detecting safety of an excitation carbon brush of a generator according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a generator excitation and carbon brush safety warning system provided in an embodiment of the present invention;
fig. 3 is a data flow chart of a generator excitation and carbon brush safety warning system according to an embodiment of the present invention;
fig. 4 is an actual assembly diagram of a mounting bracket of a generator excitation carbon brush safety early warning system provided by the embodiment of the invention on a generator;
fig. 5 is a front view of an actual application of the generator excitation carbon brush safety warning system provided by the embodiment of the invention to a generator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
Referring to fig. 1, in a first aspect, the present invention provides a method for detecting safety of an excitation carbon brush of a generator, including the following steps:
s1, selecting a collection unit, calculating pixels and a field angle of the thermal infrared temperature imaging unit 1 according to the diameter and the width of an excitation carbon brush and a slip ring of the generator, and selecting the thermal infrared temperature imaging unit 1 provided with a proper focal plane sensor and a proper thermal imaging lens;
s2, determining the number of the thermal infrared temperature imaging units 1, and estimating the number of the thermal infrared temperature imaging units 1 to be used according to the number of the excitation carbon brushes of the generator and the arrangement mode of the brush handles;
it should be noted that 1-2 brush holders are generally provided with one thermal infrared temperature imaging unit 1, and the whole generator is generally provided with 8-12 thermal infrared temperature imaging units 1.
S3, determining the installation mode of the thermal infrared temperature imaging unit 1, so that all excitation carbon brushes can enter the field angle of the thermal infrared temperature imaging unit 1 and the temperature of the excitation carbon brushes can be acquired;
s4, acquiring and transmitting data, acquiring thermal image data of the temperature of the excitation brush ring and the carbon brush of the generator by the thermal infrared temperature imaging unit 1, receiving a thermal image data signal of the thermal infrared temperature imaging unit 1 by the pre-processor 3, processing the thermal image data signal and transmitting the processed thermal image data signal to the system host 5;
s5, comprehensively processing the acquired thermal image data signals by the system host 5, and respectively displaying the thermal image video, the electronic configuration diagram and the carbon brush maintenance record content on the system host 5;
s6, the system host 5 provides a manual partition drawing tool, draws rectangular frames (all carbon brushes in each brush handle need to be contained in the rectangular frames) on the thermal image video picture according to the brush handle display area, and names and numbers the rectangular frames according to corresponding brush handle names;
s7, the system host 5 analyzes and calculates the temperature lattice in the rectangular frame to obtain the hot spot value and fluctuation value, and tracks and analyzes the hot spot and temperature fluctuation, and once: a. the fluctuation value is continuously increased, the corresponding hot point value is synchronously and continuously increased, b, the hot point value exceeds the temperature early warning value, c, the hot point temperature difference between the brush handles is overlarge and exceeds one of the three conditions of the early warning value, and the system gives an alarm and outputs an alarm signal.
According to the safety detection method for the excitation carbon brush of the generator, the monitored target is accurately analyzed and early warned in real time, the defects of dead angles, no tracking analysis, low precision, gap measurement and high labor intensity of personnel in the original detection mode are overcome, the potential safety hazard of the excitation carbon brush of the generator is comprehensively and early warned, and a reliable bottom data base is provided for realizing an intelligent power plant; according to the invention, infrared thermography is successfully applied to the excitation carbon brush monitoring of the generator, the carbon brush area is drawn on a thermal image video by using a computer technology, a unique corresponding relation is formed between the carbon brush area and the position of a physical carbon brush, and non-contact intelligent detection is carried out on the carbon brush, so that the stable operation monitoring capability of a generator excitation system is improved, and the early warning capability, the analysis level and the response efficiency of power plant accidents are improved.
Further, the safety detection method for the generator excitation carbon brush further comprises the following steps: the system host 5 performs spare part and maintenance management on the excitation carbon brush; therefore, the full-life management of the excitation of the generator and the carbon brush of the generator is realized.
Referring to fig. 2-5, in a second aspect, the invention provides a generator excitation and carbon brush safety early warning system, which includes a thermal infrared temperature imaging unit 1, a mounting bracket 2, a pre-processor 3, a wireless communication module 4 and a system host 5; wherein,
the thermal infrared temperature imaging unit 1 is used for carrying out thermal imaging and temperature acquisition on the generator excitation carbon brush and comprises a thermal imaging detector, a lens, a baffle, a processing circuit and a communication circuit.
The mounting bracket 2 comprises a fixed base, a support rod 21, a plurality of rocker arms 22 and a communication line; the thermal infrared temperature imaging unit 1 is mounted on the rocker arm 22;
the pre-processor 3 is in wired connection with the thermal infrared temperature imaging units 1 through a communication interface of the pre-processor 3, and one pre-processor 3 can be in butt joint with a plurality of thermal infrared temperature imaging units 1 to complete the processing and transmission of thermal image data of the thermal infrared temperature imaging units 1;
the wireless communication module 4 comprises a wireless communication module route 41 and a wireless communication module substation 42, the wireless communication module substation 42 is connected with the preprocessor 3 to complete preprocessing and communication functions, and a wireless local area network is established through the wireless communication module route 41 to complete the communication functions of all the wireless communication modules 4 of the system;
and the system host 5 is connected with the wireless communication module route 41 to complete thermal image data acquisition, processing, storage, analysis, display, alarm and output functions of all the thermal infrared temperature imaging units 1.
The generator excitation and carbon brush safety early warning system provided by the above-mentioned, through setting up thermal infrared temperature imaging unit 1, installing support 2, preprocessor 3, wireless communication module 4 and system host computer 5, it is accurate to change the temperature or the current coarse detection of personnel's hand-held type into online thermal imagery, detect comprehensively, and utilize installing support 2 designed, preprocessor 3 realizes carrying out accurate analysis, the early warning to the monitoring target in real time, the shortcoming that original detection mode is because there is the dead angle, there is not tracking analysis, the precision is not high, the clearance is measured, personnel intensity of labour is big has been eliminated, make the potential safety hazard of the excitation carbon brush of generator obtain comprehensively, early warning, provide a reliable bottom data basis for realizing the wisdom power plant.
The early warning system successfully applies the infrared thermal imaging technology to the excitation carbon brush monitoring of the generator, and uses the computer technology to realize the drawing of the carbon brush area on the thermal image video, and form the unique corresponding relation with the physical carbon brush position to carry out non-contact intelligent detection on the carbon brush, thereby improving the stable operation monitoring capability of the generator excitation system, and being beneficial to improving the early warning capability, the analysis level and the response efficiency of the power plant accidents.
Preferably, the pre-processor 3 and the wireless communication module 4 are assembled in one device and mounted near the mounting bracket 2; thus, the structure is simple and the installation is simple.
Preferably, the pre-processor 3 processes thermal image data collected by 3 thermal infrared temperature imaging units 1 at least at the same time; therefore, the configuration utilization rate is high, and the cost is reduced.
In addition, the early warning system can be widely applied to safety detection and hidden danger early warning of devices or places such as petrochemical industry, steel, storage and the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (5)

1. A safety detection method for an excitation carbon brush of a generator is characterized by comprising the following steps:
the method comprises the following steps that a collection unit is selected, pixels of a thermal infrared temperature imaging unit and a field angle of the thermal infrared temperature imaging unit are calculated according to the diameter and the width of an excitation carbon brush and a slip ring of a generator, and the thermal infrared temperature imaging unit provided with a proper focal plane sensor and a proper thermal imaging lens is selected;
determining the number of the thermal infrared temperature imaging units, and estimating the number of the thermal infrared temperature imaging units to be used according to the number of the excitation carbon brushes of the generator and the arrangement mode of the brush handles;
determining the installation mode of the thermal infrared temperature imaging unit, so that all excitation carbon brushes can enter the field angle of the thermal infrared temperature imaging unit and the temperature of the excitation carbon brushes can be acquired;
the system comprises a thermal infrared temperature imaging unit, a pre-processor, a system host and a generator excitation brush ring, wherein the thermal infrared temperature imaging unit acquires thermal image data of the temperature of a generator excitation brush ring and a carbon brush of the generator excitation brush ring, and the pre-processor receives a thermal image data signal of the thermal infrared temperature imaging unit, processes the thermal image data signal and transmits the processed thermal image data signal to the system host;
the system host machine carries out comprehensive processing on the acquired thermal image data signals and respectively displays thermal image videos, electronic configuration diagrams and carbon brush maintenance record contents on the system host machine;
the system host provides a manual drawing partitioning tool, rectangular frames are drawn on a thermal image video picture according to brush handle display areas (all carbon brushes in each brush handle need to be contained in the rectangular frames), and the rectangular frames are named and numbered according to corresponding brush handle names;
the system host computer analyzes and calculates the temperature lattice in the rectangular frame to obtain the hot spot value and the fluctuation value, and tracks and analyzes the hot spot and the temperature fluctuation, once the temperature lattice occurs: a. the fluctuation value is continuously increased, the corresponding hot point value is synchronously and continuously increased, b, the hot point value exceeds the temperature early warning value, c, the hot point temperature difference between the brush handles is overlarge and exceeds one of the three conditions of the early warning value, and the system gives an alarm and outputs an alarm signal.
2. The safety detection method for the excitation carbon brush of the generator according to claim 1, further comprising: and the system host machine performs spare part and maintenance management on the excitation carbon brush.
3. A generator excitation and carbon brush safety early warning system is characterized by comprising a thermal infrared temperature imaging unit, a mounting bracket, a front processor, a wireless communication module and a system host; wherein,
the thermal infrared temperature imaging unit is used for carrying out thermal imaging and temperature acquisition on the generator excitation carbon brush and comprises a thermal imaging detector, a lens, a baffle, a processing circuit and a communication circuit;
the mounting bracket comprises a fixed base, a supporting rod, a plurality of rocker arms and a communication line; the thermal infrared temperature imaging unit is mounted on the rocker arm.
The front processor is in wired connection with the thermal infrared temperature imaging units through a communication interface of the front processor, and one front processor can be in butt joint with a plurality of thermal infrared temperature imaging units to complete the processing and transmission of thermal image data of the thermal infrared temperature imaging units;
the wireless communication module comprises a wireless communication module route and a wireless communication module substation, the wireless communication module substation is connected with the preprocessor to complete preprocessing and communication functions, and a wireless local area network is established through the wireless communication module route to complete the communication functions of all the wireless communication modules of the system;
the system host is in routing connection with the wireless communication module to complete thermal image data acquisition, processing, storage, analysis, display, alarm and output functions of all the thermal infrared temperature imaging units.
4. The generator excitation and carbon brush safety warning system according to claim 3, wherein the pre-processor and the wireless communication module are assembled in one device and are installed near the mounting bracket.
5. The generator excitation and carbon brush safety pre-warning system as claimed in claim 3 or 4, wherein the pre-processor is configured to process thermal image data collected by at least 3 thermal infrared temperature imaging units simultaneously.
CN201910817099.7A 2019-08-30 2019-08-30 A kind of generator excitation carbon brush safety detection method and early warning system Pending CN110487417A (en)

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112197867A (en) * 2020-09-25 2021-01-08 华能四川水电有限公司 Carbon brush detection and early warning state setting method
CN112595421A (en) * 2021-03-02 2021-04-02 成都工百利自动化设备有限公司 System for monitoring heating of motor carbon brush and installation method
CN113758578A (en) * 2021-09-24 2021-12-07 贵州北盘江电力股份有限公司马马崖分公司 Intelligent thermal imager temperature monitoring system

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CN107228713A (en) * 2016-03-25 2017-10-03 郑州海威光电科技有限公司 The fault monitoring device and monitoring method of a kind of generator carbon brush
CN208458882U (en) * 2018-08-02 2019-02-01 国家电网有限公司 A kind of the fever early warning system and generator of generator excited system
CN210268912U (en) * 2019-08-30 2020-04-07 深圳大成智能电气科技有限公司 Generator excitation carbon brush safety early warning system

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CN107228713A (en) * 2016-03-25 2017-10-03 郑州海威光电科技有限公司 The fault monitoring device and monitoring method of a kind of generator carbon brush
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112197867A (en) * 2020-09-25 2021-01-08 华能四川水电有限公司 Carbon brush detection and early warning state setting method
CN112197867B (en) * 2020-09-25 2021-06-22 华能四川水电有限公司 Carbon brush detection and early warning state setting method
CN112595421A (en) * 2021-03-02 2021-04-02 成都工百利自动化设备有限公司 System for monitoring heating of motor carbon brush and installation method
CN113758578A (en) * 2021-09-24 2021-12-07 贵州北盘江电力股份有限公司马马崖分公司 Intelligent thermal imager temperature monitoring system

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