CN113466553A - Harmonic monitoring system based on intelligent switch - Google Patents

Harmonic monitoring system based on intelligent switch Download PDF

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Publication number
CN113466553A
CN113466553A CN202110681166.4A CN202110681166A CN113466553A CN 113466553 A CN113466553 A CN 113466553A CN 202110681166 A CN202110681166 A CN 202110681166A CN 113466553 A CN113466553 A CN 113466553A
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CN
China
Prior art keywords
module
harmonic
intelligent switch
monitoring
monitoring system
Prior art date
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Pending
Application number
CN202110681166.4A
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Chinese (zh)
Inventor
梁剑
田蓓
张爽
郭欣然
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan University WHU
Electric Power Research Institute of State Grid Ningxia Electric Power Co Ltd
Original Assignee
Wuhan University WHU
Electric Power Research Institute of State Grid Ningxia Electric Power Co Ltd
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Application filed by Wuhan University WHU, Electric Power Research Institute of State Grid Ningxia Electric Power Co Ltd filed Critical Wuhan University WHU
Priority to CN202110681166.4A priority Critical patent/CN113466553A/en
Publication of CN113466553A publication Critical patent/CN113466553A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/16Spectrum analysis; Fourier analysis
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00Testing of machine parts
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/2506Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
    • G01R19/2509Details concerning sampling, digitizing or waveform capturing
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R22/00Arrangements for measuring time integral of electric power or current, e.g. electricity meters
    • G01R22/06Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
    • G01R22/10Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3277Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The invention belongs to the technical field of harmonic detection, and particularly relates to a harmonic monitoring system based on an intelligent switch, which comprises an intelligent switch and a monitoring system, wherein the intelligent switch consists of a touch liquid crystal display unit, a charged display and locking control unit, a main control unit, a switching value input interface, a control unit and a communication interface, the monitoring system comprises a signal analysis module, a harmonic monitoring feedback module, an electric energy acquisition and display module, a mechanical characteristic monitoring module, a lightning arrester monitoring module, a signal acquisition module, a central processing unit module and a high-speed communication module, and the harmonic monitoring feedback module is arranged on the basis of a signal input interface, a signal output interface and a high-speed communication interface. The mechanical characteristic, the state of the lightning arrester and the state of the electric quantity of the intelligent switch can be displayed in a centralized manner and can be used for early warning faults, accidents are prevented, the problem points can be found out quickly through the expert database system when the problems occur, wiring is simple when the intelligent switch is assembled in a complete set, the system and other units are connected through wired or wireless communication, wiring is simple, and the number of the fault points is reduced.

Description

Harmonic monitoring system based on intelligent switch
Technical Field
The invention relates to the technical field of harmonic detection, in particular to a harmonic monitoring system based on an intelligent switch.
Background
The intelligent switch is a unit which utilizes the combination and programming of a control panel and an electronic component to realize the control of the intelligent switch of the circuit. The switching control is also called BANG-BANG control, and is adopted in the control of many home appliances and lighting fixtures because of its simple and easy implementation. But the conventional switch control is difficult to meet the requirements of further improving the control precision and saving energy.
However, with the increasing of nonlinear loads in the power system, harmonic current is generated and injected into the power grid, so that the voltage waveform in the power grid is distorted, harmonic pollution is caused to the power grid, and the power quality is deteriorated. Therefore, the harmonic wave monitoring can further develop the power quality, and an accurate detection result has a significant guiding effect on the prevention and treatment of the harmonic wave. However, the monitoring system of the current power system cannot effectively monitor the harmonic waves in the power grid.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a harmonic monitoring system based on an intelligent switch.
The invention provides a harmonic monitoring system based on an intelligent switch, which comprises the intelligent switch and a monitoring system, wherein the intelligent switch consists of a touch liquid crystal display unit, a charged display and locking control unit, a main control unit, a switching value input interface, a control unit and a communication interface; the central processing unit module is connected with the harmonic wave monitoring feedback module and used for sending alarm information after receiving the trigger signal, and the mechanical characteristic monitoring module runs on the desktop host or the mobile intelligent terminal and is used for acquiring real-time data and analysis results on the monitoring server.
Preferably, the signal acquisition module is externally connected with a three-phase voltage signal, the signal acquisition module is electrically or communicatively connected with the central processing unit module, the high-speed communication module is electrically or communicatively connected with the central processing unit module, and the high-speed communication module is communicatively connected with the data center.
Preferably, the signal acquisition module includes a signal conditioning circuit and an analog-to-digital converter, the signal conditioning circuit is configured to convert ac voltage and current signals of the power grid into low-voltage signals that can be recognized by the analog-to-digital converter, the analog-to-digital converter is configured to perform analog-to-digital conversion on the voltage signals output by the signal conditioning circuit, and the high-speed communication module sends the analyzed data to the data center.
Preferably, the number of the harmonic monitoring modules is multiple, and the multiple harmonic monitoring modules are connected in parallel.
Preferably, the data analysis module comprises a time domain analysis unit, a frequency domain analysis unit, an on-load tap-changer state analysis unit and an evaluation unit; the time domain analysis unit is used for performing time domain analysis on first current data of the intelligent switch and first vibration data of the intelligent switch in the process of adjusting the switch gear of the on-load tap-changer to obtain current change characteristics to be detected and vibration change characteristics to be detected.
Preferably, the frequency domain analysis unit is configured to perform frequency domain analysis on the first current data and the first vibration data to obtain a correlation characteristic between a current harmonic to be detected and vibration; the on-load tap-changer state analysis unit is used for analyzing second current data of the on-load tap-changer driving motor and second vibration data of the on-load tap-changer driving motor in the process of adjusting the gear of the on-load tap-changer to obtain state information of the on-load tap-changer to be detected.
Preferably, the evaluation unit is configured to analyze and compare the current change characteristic to be detected and the vibration change characteristic to be detected, the association characteristic between the current harmonic wave to be detected and the vibration, and the state information of the on-load tap-changer to be detected with the current change characteristic, the vibration change characteristic, the association characteristic between the current harmonic wave and the vibration, and the state information of the on-load tap-changer in a preset historical database, respectively, to obtain an evaluation result, and determine whether the alarm unit needs to be started according to the evaluation result.
The beneficial effects of the invention are as follows:
1. this harmonic monitoring system based on intelligence switch, through being provided with signal analysis module, harmonic monitoring feedback module, electric energy collection display module, mechanical properties monitoring module, arrester monitoring module, signal acquisition module, central processor module and high-speed communication module, intelligence switch's mechanical properties, arrester state and electric quantity state can concentrate demonstration and failure early warning, prevent the occurence of failure, the problem point can be found out rapidly through device expert storehouse system to the problem of appearing, during intelligence switch complete set equipment, the wiring is simple, system and other units all couple through wired or wireless communication, the wiring is simple, reduce the fault point.
2. According to the harmonic monitoring system based on the intelligent switch, the data analysis module is arranged, so that a complex algorithm can be realized, a large amount of data can be subjected to real-time operation analysis, and the harmonic monitoring system is very suitable for harmonic monitoring of a power system; the adopted bus has the advantages of high speed, long distance, high reliability and the like.
3. This harmonic monitoring system based on intelligence switch sends out the police dispatch newspaper when being provided with alarm unit at the electric current of alarm unit place branch road and being greater than the basic current of predetermineeing the multiple to can report to the police when excessive situation of load emergence harmonic, thereby have important guide effect to further prevention and the improvement of harmonic.
The parts of the device not involved are the same as or can be implemented using prior art.
Drawings
Fig. 1 is a schematic structural diagram of an intelligent switch of a harmonic monitoring system based on the intelligent switch according to the present invention;
fig. 2 is a schematic structural diagram of a monitoring system of a harmonic monitoring system based on an intelligent switch according to the present invention.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
Referring to fig. 1-2, a harmonic monitoring system based on an intelligent switch comprises an intelligent switch and a monitoring system, wherein the intelligent switch is composed of a touch liquid crystal display unit, a live display and locking control unit, a main control unit, a switching value input interface, a control unit and a communication interface, the monitoring system comprises a signal analysis module, a harmonic monitoring feedback module, an electric energy acquisition and display module, a mechanical characteristic monitoring module, a lightning arrester monitoring module, a signal acquisition module, a central processor module and a high-speed communication module, the harmonic monitoring feedback module is connected with the intelligent switch, and the harmonic monitoring feedback module is used for sending a trigger signal when harmonic is contained in current detected by a harmonic monitoring device; the central processing unit module, be connected with harmonic monitoring feedback module, be used for sending alarm information after receiving triggering signal, mechanical properties monitoring module, the operation is on desktop host computer or mobile intelligent terminal, be used for acquireing real-time data and analysis result on the monitoring server, intelligence switch's mechanical properties, arrester state and electric quantity state can concentrate demonstration and failure early warning, prevent the occurence of failure, the problem point can be found out rapidly through device expert storehouse system to the problem, during intelligence switch complete set equipment, the wiring is simple, system and other units all connect through wired or wireless communication, the wiring is simple, reduce the fault point.
In the invention, a signal acquisition module is externally connected with a three-phase voltage signal, the signal acquisition module is electrically or communicatively connected with a central processor module, a high-speed communication module is electrically or communicatively connected with the central processor module, and the high-speed communication module is communicatively connected with a data center.
According to the invention, the signal acquisition module comprises a signal conditioning circuit and an analog-to-digital converter, the signal conditioning circuit is used for converting alternating-current voltage and current signals of a power grid into low-voltage signals which can be identified by the analog-to-digital converter, the analog-to-digital converter is used for performing analog-to-digital conversion on the voltage signals output by the signal conditioning circuit, and the high-speed communication module is used for sending analyzed data to the data.
In the invention, the number of the harmonic monitoring modules is multiple, and the multiple harmonic monitoring modules are connected in parallel.
In the invention, the data analysis module comprises a time domain analysis unit, a frequency domain analysis unit, an on-load tap-changer state analysis unit and an evaluation unit; the time domain analysis unit is used for performing time domain analysis on first current data of the intelligent switch and first vibration data of the intelligent switch in the process of adjusting the switch gear of the on-load tap-changer to obtain the current change characteristic to be detected and the vibration change characteristic to be detected; the adopted bus has the advantages of high speed, long distance, high reliability and the like.
In the invention, a frequency domain analysis unit is used for carrying out frequency domain analysis on the first current data and the first vibration data to obtain the correlation characteristic between current harmonic waves to be detected and vibration; and the on-load tap-changer state analysis unit is used for analyzing second current data of the on-load tap-changer driving motor and second vibration data of the on-load tap-changer driving motor in the process of regulating the gear of the on-load tap-changer to obtain the state information of the on-load tap-changer to be detected.
In the invention, the evaluation unit is used for analyzing and comparing the current change characteristic to be detected and the vibration change characteristic to be detected, the association characteristic between the current harmonic wave to be detected and the vibration, and the state information of the on-load tap-changer to be detected with the current change characteristic, the vibration change characteristic, the association characteristic between the current harmonic wave and the vibration and the state information of the on-load tap-changer in a preset historical database respectively to obtain an evaluation result, and determining whether the alarm unit needs to be started or not according to the evaluation result.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (7)

1. A harmonic monitoring system based on an intelligent switch comprises the intelligent switch and a monitoring system, and is characterized in that the intelligent switch is composed of a touch liquid crystal display unit, a live display and locking control unit, a main control unit, a switching value input interface, a control unit and a communication interface, the monitoring system comprises a signal analysis module, a harmonic monitoring feedback module, an electric energy acquisition and display module, a mechanical characteristic monitoring module, a lightning arrester monitoring module, a signal acquisition module, a central processor module and a high-speed communication module, the harmonic monitoring feedback module is connected with the intelligent switch, and the harmonic monitoring feedback module is used for sending a trigger signal when harmonic is contained in current detected by a harmonic monitoring device; the central processing unit module is connected with the harmonic wave monitoring feedback module and used for sending alarm information after receiving the trigger signal, and the mechanical characteristic monitoring module runs on the desktop host or the mobile intelligent terminal and is used for acquiring real-time data and analysis results on the monitoring server.
2. The harmonic monitoring system based on the intelligent switch as claimed in claim 1, wherein the signal acquisition module is externally connected with a three-phase voltage signal, the signal acquisition module is electrically or communicatively connected with the central processing unit module, the high-speed communication module is electrically or communicatively connected with the central processing unit module, and the high-speed communication module is communicatively connected with a data center.
3. The harmonic monitoring system based on the intelligent switch as claimed in claim 2, wherein the signal acquisition module comprises a signal conditioning circuit and an analog-to-digital converter, the signal conditioning circuit is configured to convert the ac voltage and current signals of the power grid into low voltage signals that can be recognized by the analog-to-digital converter, the analog-to-digital converter is configured to perform analog-to-digital conversion on the voltage signals output by the signal conditioning circuit, and the high-speed communication module is configured to send the analyzed data to a data center.
4. The harmonic monitoring system based on the intelligent switch as claimed in claim 1, wherein the number of the harmonic monitoring modules is plural, and plural harmonic monitoring modules are connected in parallel.
5. The harmonic monitoring system based on the intelligent switch as claimed in claim 1, wherein the data analysis module comprises a time domain analysis unit, a frequency domain analysis unit, an on-load tap changer state analysis unit, and an evaluation unit; the time domain analysis unit is used for performing time domain analysis on first current data of the intelligent switch and first vibration data of the intelligent switch in the process of adjusting the switch gear of the on-load tap-changer to obtain current change characteristics to be detected and vibration change characteristics to be detected.
6. The harmonic monitoring system based on the intelligent switch as claimed in claim 5, wherein the frequency domain analysis unit is configured to perform frequency domain analysis on the first current data and the first vibration data to obtain a correlation characteristic between a current harmonic to be detected and a vibration; the on-load tap-changer state analysis unit is used for analyzing second current data of the on-load tap-changer driving motor and second vibration data of the on-load tap-changer driving motor in the process of adjusting the gear of the on-load tap-changer to obtain state information of the on-load tap-changer to be detected.
7. The harmonic monitoring system based on the intelligent switch according to claim 6, wherein the evaluation unit is configured to analyze and compare the current change characteristic to be detected and the vibration change characteristic to be detected, the association characteristic between the current harmonic and the vibration to be detected, and the state information of the on-load tap-changer to be detected with the current change characteristic, the vibration change characteristic, the association characteristic between the current harmonic and the vibration, and the state information of the on-load tap-changer in a preset historical database, respectively, obtain an evaluation result, and determine whether the alarm unit needs to be activated according to the evaluation result.
CN202110681166.4A 2021-06-18 2021-06-18 Harmonic monitoring system based on intelligent switch Pending CN113466553A (en)

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Application Number Priority Date Filing Date Title
CN202110681166.4A CN113466553A (en) 2021-06-18 2021-06-18 Harmonic monitoring system based on intelligent switch

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103516052A (en) * 2013-10-12 2014-01-15 河南开启电力实业有限公司 Power distribution equipment on-line monitoring early-warning terminal
CN104135071A (en) * 2014-07-16 2014-11-05 南京捷泰电力设备有限公司 Multi-functional low-voltage intelligent switch
CN105356600A (en) * 2015-10-30 2016-02-24 国网山东滨州市沾化区供电公司 Intelligent switch cabinet detector and monitoring system thereof
CN111426876A (en) * 2020-03-31 2020-07-17 深圳供电局有限公司 Harmonic monitoring device and harmonic monitoring system based on intelligent switch
CN111562425A (en) * 2020-04-22 2020-08-21 南方电网科学研究院有限责任公司 Transformer harmonic wave, vibration and on-load tap-changer state monitoring system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103516052A (en) * 2013-10-12 2014-01-15 河南开启电力实业有限公司 Power distribution equipment on-line monitoring early-warning terminal
CN104135071A (en) * 2014-07-16 2014-11-05 南京捷泰电力设备有限公司 Multi-functional low-voltage intelligent switch
CN105356600A (en) * 2015-10-30 2016-02-24 国网山东滨州市沾化区供电公司 Intelligent switch cabinet detector and monitoring system thereof
CN111426876A (en) * 2020-03-31 2020-07-17 深圳供电局有限公司 Harmonic monitoring device and harmonic monitoring system based on intelligent switch
CN111562425A (en) * 2020-04-22 2020-08-21 南方电网科学研究院有限责任公司 Transformer harmonic wave, vibration and on-load tap-changer state monitoring system

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