CN108333457A - Lightning arrestor on-line monitoring methods based on Internet of Things Network Communication and device - Google Patents
Lightning arrestor on-line monitoring methods based on Internet of Things Network Communication and device Download PDFInfo
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- 238000004891 communication Methods 0.000 title claims abstract description 35
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 22
- 238000005070 sampling Methods 0.000 claims abstract description 15
- 230000032683 aging Effects 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 230000009466 transformation Effects 0.000 claims abstract description 9
- 230000009471 action Effects 0.000 claims abstract description 3
- 230000006870 function Effects 0.000 claims description 15
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 10
- 238000004458 analytical method Methods 0.000 claims description 6
- 230000006866 deterioration Effects 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 5
- 239000011787 zinc oxide Substances 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 3
- 239000004973 liquid crystal related substance Substances 0.000 claims description 3
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- 238000007689 inspection Methods 0.000 description 5
- 229960001296 zinc oxide Drugs 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 208000025274 Lightning injury Diseases 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
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- 241000124033 Salix Species 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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Abstract
A kind of lightning arrestor on-line monitoring methods and device based on Internet of Things Network Communication, on-line measuring device is using CPU module as core, CPU module is separately connected sampling module, environment temperature detection module, power module, LCD MODULE, communication module, and on-line monitoring method includes：Measure the total leakage current of arrester；Acquire busbar voltage；Discrete digitized, Fourier transformation and operation by the total leakage current of the arrester of acquisition and busbar voltage, acquire total current in resistance property, resistive current first harmonics value and each harmonic value in total leakage current in real time, with previous value longitudinal comparison, judges surge arrester failure, filth, makes moist or aging.The present invention can have found and debug early arrester, it avoids that explosion accident occurs, can to arrester Leakage Current and reaction arrester resistance current component and action frequency carry out data remote, eliminate manual record, meter reading it is complicated, substantially increase the working efficiency of operation maintenance personnel.
Description
Technical field
The present invention relates to the intelligent substations in electric system, and in particular to a kind of arrester based on Internet of Things Network Communication exists
Line monitoring method and device.
Background technology
Technology of Internet of things is important component of the intelligent grid to extraneous information Perception, is had in the power system wide
Application prospect.Technological core and equipment extension of the intelligent substation as intelligent grid, make a variety of key technologies of Internet of Things obtain
With concrete application.
Metal oxide arrester is a kind of common equipment of intelligent Power Station, to ensure electric system normal operation, no
Generate injury.The cardinal principle of this arrester (also referred to as MOA) is atmospheric over-voltage or the inside by being applied in equipment
Overvoltage carries out non-linear regulation and control, to ensure to apply by the voltage in protection equipment in normal range (NR).But in practical work
In work, this arrester may will produce damage, cause bigger leakage of current since overvoltage acts on.Generate electric leakage
Afterwards, also resulting in power has additional loss, causes MOA badly damaged, in some instances it may even be possible to more serious accident occur, endanger people
Body property safety.Therefore, the periodic inspection that extremely focus on arrester in power industry, detects the drain conditions of arrester.This
Sample can ensure the normal work of MOA, ensure the safe operation of electric system.
Arrester is the important electrical that power equipment is protected in power grid from overvoltage injury, reliability of operation
The safety of electric system will be directly affected.Metal oxide arrester due to its gapless, it is big etc. excellent without afterflow and flow capacity
Point extensive use in substation.And arrester has Leakage Current under working voltage effect and flows through, the heat of generation can make
The temperature of resistor disc increases, and long-term work in this case can make the resistor disc aging of arrester.And due to environmental condition
It influencing, the resistor disc of arrester can make moist and deteriorate, and Leakage Current when normal work is made to increase, once occurred electricity in system
Pressure, the possible thermal runaway of arrester, or even explosion, arrester are ineffective therewith.Therefore need to the operating status of arrester into
The uninterrupted on-line monitoring of row, to ensure arrester safe operation.
Traditional lightning protection device monitoring mode is divided into two kinds, and one is power failure experiment inspection is periodically done, this method needs to have a power failure,
The experimental voltage added is too low, and test period is long, and artificial haulage equipment is needed to go site inspection, cumbersome, can't be anti-in real time
Reflect the insulation situation of arrester；Second is the detection mode not powered off, by terminating measuring instrument records in arrester ground
The data such as Leakage Current, this method both do not account for eliminating the factors such as interphase interference, and selection also can not accurately be gone to refer to phase
Position and voltage, there are still test period is long, the shortcomings of can not finding failure in time.Therefore, traditional monitoring mode not only work
Journey is complicated and spends human and material resources, and cannot promptly and accurately reflect arrester situation, cannot meet the hair of current intelligent substation
Exhibition needs.
Invention content
The technical problem to be solved by the present invention is to：The above-mentioned problems of the prior art is solved, and one kind is provided and is based on
On the one hand the lightning arrestor on-line monitoring methods and device of Internet of Things Network Communication can ensure that the safe operation of transformer substation arrester is pre-
Alert, find and debug early arrester, avoids that Explosion of on Arrester accident occurs, another aspect can reveal arrester
Electric current and reaction arrester resistance current component and action frequency carry out data remote, exempt manual record, meter reading it is complicated, greatly
The big working efficiency for improving operation maintenance personnel.
The technical solution adopted by the present invention is：
A kind of arrester on-Line Monitor Device based on Internet of Things Network Communication, using CPU module as core, the CPU module
Input terminal is connected with sampling module, environment temperature detection module and power module, the electric current that arrester is connected using module
Mutual inductor and voltage transformer, the temperature sensor of the environment temperature detection module connection arrester, the power module connect
Connect mains supply；The output end of the CPU module connects LCD MODULE, and the LCD MODULE connects liquid crystal display
Device；The CPU module is also associated with communication module and is communicated with communication module, the system of the communication module and intelligent substation
Main website carries out wireless communication.
In above-mentioned technical proposal, the sampling module includes the current transformer of arrester and voltage transformer, active
Second-order filter circuit, ADC converters, the ADC converters are the converter that analog quantity is converted to digital quantity, and the ADC turns
Parallel operation using hardware phase lock high precision loop technique acquire with frequency, and each frequency cycle is humorous three times designed for analysis metering leakage current
128 sampled points of wave component.
A kind of lightning arrestor on-line monitoring methods based on Internet of Things Network Communication, including：
The first step measures the arrester lower end connection midpoint of three-phase to total leakage current on ground：It will be on the arrester of three-phase
End is separately connected three phase network busbar, and three-phase lightning protector lower end links together as connection midpoint, and the connection midpoint is arrived
Ground, by current transformer acquire the connection midpoint to ground total leakage current, when the insulation performance of the arrester of three-phase is normal
When, the sum of triple-frequency harmonics of three-phase leakage current very little, when certain phase arrester breaks down, the fundamental wave of each phase leakage current at
Divide phase-amplitude that can change, cause each component that can not cancel out each other so that total leakage current values increase substantially, this is total
The characteristic quantity that leakage current value added is diagnosed as surge arrester failure；
Second step, using the resistive current first harmonics component of total leakage current as the characteristic quantity of reflection arrester deterioration process：
Arrester in the process of running, make moist and when surface filth, total leakage current variation is little, but accounts for by internal valve block aging
The current in resistance property of total leakage current 10-20% but greatly increases, therefore current in resistance property could the sensitive deterioration process for reflecting arrester；
Due to arrester zinc oxide valve plate resistance have nonlinear wind vibration, the current in resistance property flowed through contain fundamental wave, three times, five times
And higher order harmonics, the fundametal compoment size of wherein current in resistance property is not interfered by Electric Network Higher Harmonic, and can reflect arrester
Deterioration process；For arrester due to being chronically at small area analysis region, the high fdrequency component for flowing through valve block is minimum, can be arrester valve
Piece approximation regards the circuit of a nonlinear resistance and capacitance parallel connection as, the total Leakage Current for flowing through valve block be mainly current in resistance property and
Capacity current ingredient；
Third walks, and busbar voltage is acquired by voltage transformer；
4th step, the total leakage current of the arrester of acquisition and busbar voltage progress is discrete digitized, become by Fourier
It changes and acquires the fundamental wave value of total leakage current and busbar voltage and the phase and amplitude of each harmonic in a frequency domain, and always let out from real time
Total current in resistance property value, resistive current first harmonics value and current in resistance property each harmonic value in real time are isolated in leakage current；
5th step, total current in resistance property value, resistive current first harmonics value and the resistive electricity that will be isolated in real-time total leakage current
The each harmonic value total current in resistance property value previous with arrester, resistive current first harmonics value and current in resistance property each harmonic value is flowed to carry out
Longitudinal comparison, if the percentage that current in resistance property accounts for total Leakage Current rises appreciably, wherein fundamental wave measured value increasing degree more for the first time
It is larger, and measured value increases unobvious to harmonic wave more for the first time, then can be identified as arrester filth or internal wetted；If current in resistance property accounts for
The percentage of total Leakage Current rises appreciably, wherein harmonic wave is larger compared with measured value increasing degree for the first time, fundamental wave measured value more for the first time
Increase unobvious, it may be determined that be arrester aging.
In above-mentioned technical proposal, the total leakage current of the arrester by acquisition, busbar voltage carry out discrete digitized
Refer to being digitized the discrete signal of the total leakage current of arrester, busbar voltage so that the functional value of discrete signal only takes
Finite value.
In above-mentioned technical proposal, the total leakage current of the arrester by acquisition and busbar voltage progress are discrete digitized,
By Fourier transformation and operation, total leakage current and the fundamental wave value of busbar voltage and the phase of each harmonic are acquired in a frequency domain
And amplitude, specifically：
Network voltage, total Leakage Current all meet Di Liheli conditions, are obtained to busbar voltage Fourier expansion：
In formula, U0For DC voltage value, UkmFor k subharmonic amplitudes, m indicates maximum value, αkFor busbar voltage k subharmonic phases
Angle, ω are angular frequency, and t is initial time, and k is each harmonic component, k=1,2,3 ....
Total Leakage Current Fourier expansion is obtained：
In formula, I0For the DC component of total Leakage Current, IkmFor the k subharmonic amplitudes of total Leakage Current, βkAlways to reveal
The k subharmonic phase angles of electric current.
In low current area, capacitance is almost constant, can be in the hope of total Leakage Current capacitive component by (5-1)：
In above formula, the k subharmonic amplitudes of total Leakage Current capacitive component are：Ickm=k ω CUkm。
Because of busbar voltage and the same phase of Leakage Current resistive composition, each harmonic also same phase, if IrkFor the resistive of k subharmonic
Current amplitude, current in resistance property are：
Again because of ix=ir+ic, (5-2), (5-3), (5-4) substitution are wherein had：
Sin (n ω t+ α are multiplied by the formula both sides (5-5) simultaneouslyn), and definite integral is taken in some cycles, have：
According to the orthogonal property of the product of trigonometric function in one cycle：
For formula (5-6), only in k=n, the definite integral of respective items is not equal to 0, can abbreviation be：
Simplify (5-9) using the product to sum formula of trigonometric function to obtain：
It can be obtained using the orthogonal property of trigonometric function：
：
：
So having：
Irk=Ikmcos(βk-αk)=Ikm[cosαk cosβk+sinαk sinβk] (5-13)
Similarly, cos (n ω t+ α are multiplied by the both sides (5-5) simultaneouslyn), and definite integral is taken in same period, according to triangle
Function orthogonal property, only as k=n, definite integral has the item that is not zero.The each harmonic amount that capacity current can be obtained after abbreviation is：
Ick=Ikmsin(βk-αk)=Ikm[cosαk cosβk-sinαk sinβk] (5-14)
It is each that total current in resistance property value, resistive current first harmonics value and current in resistance property are isolated from total Leakage Current using the method
Subharmonic value.
Above-mentioned total Leakage Current is divided into two parts of capacity current value and current in resistance property value, therefore from total Leakage Current value
Separation；It is to acquire total Leakage Current capacitive component to calculate to acquire busbar voltage, and formula (5- can be obtained from formula (5-1) transformation
3) it, is embodied in final result formula (5-14) and arrives αkFor busbar voltage k subharmonic phase angles.
In above-mentioned technical proposal, when filthy and internal wetted fault warning, current in resistance property accounting, that fundamental wave increases amplitude is harmonious
The setting valve 0-99 that wave increases amplitude can be set online；When arrester aging alerts, current in resistance property accounting, fundamental wave increase amplitude harmony
The setting valve 0-99 that wave increases amplitude can be set online.
The lightning arrestor on-line monitoring methods and device based on Internet of Things Network Communication of the present invention will be acquired by Internet of Things Network Communication
Data remote transmission to main website, if arrester breaks down, host computer can send out failure alarm signal, and it is logical to be responsible for monitoring personnel
Know that service personnel goes site inspection to repair or replace arrester.Drastically reduce the complicated of manual patrol work and the examination that has a power failure
The loss brought is tested, can be facilitated monitoring personnel with automatic data collection and by data remote transmission to monitoring room and send out in time
Existing surge arrester failure defect simultaneously replaces arrester under necessary condition, has carried out running arrester intelligent, real-time, reliable
Monitoring, prevent potential faults, improve power supply reliability.
Advantageous effect
(1) it is accurate to measure, and using the active Zero flux punching mutual inductor of high-precision, is selected automatically according to tested earth-current size
Amplification factor is selected, realizes high-acruracy survey.
(2) data are reliable, and measuring unit has perfect fault detection mechanism, and energy is timely, accurately reflects arrester
Working condition ensure that authenticity, the accuracy of data source.
(3) high degree of automation realizes substation by being sampled, being analyzed to arrester Leakage Current, busbar voltage
The unmanned on-line monitoring of arrester equipment, more acurrate, the effective operating status for judging arrester.
(4) system is flexibly, reliable, input cost is low, is then carried out using GSM/GPRS between detection device and system main website
Communication.Above-mentioned communication configuration enhances reliability, flexibility, the applicability of system, and saves a large amount of network communication bases
Construction cost.
(5) it safeguards simply, device uses modularized design, complying with standard requirement to have versatility and the exchange of height
Property, all components including sensor can be repaired or replaced under conditions of not influencing equipment operation.
Description of the drawings：
Fig. 1 is apparatus of the present invention complete machine structure schematic diagram；
Fig. 2 is sampling module fundamental diagram of the present invention；
Fig. 3 is arrester checks schematic diagram of the present invention；
Fig. 4 is arrester valve piece equivalent circuit simulation drawing of the present invention.
Specific implementation mode：
Referring to Fig. 1, the arrester on-Line Monitor Device based on Internet of Things Network Communication includes sampling module, CPU module, liquid crystal
Show module, wireless communication module, environment temperature detection module, power module.
(1) sampling module module
Sampling module includes voltage transformer, current transformer and second-order filter circuit, ADC conversion circuit devices, sampling letter
Number by through active second-order filter circuit filtering after, obtain the third-harmonic component of Leakage Current.Leakage Current triple-frequency harmonics point
Amount and network voltage are obtained by 16 ADC analog-digital conversions, and sampling precision is high.ADC converters use hardware phase lock high precision loop technique
Acquire with frequency, each 128 points of frequency cycle design sampling, for analyzing, calculating Leakage Current third-harmonic component.
(2) CPU module
The high-performance 32-bit dsp chip provided using Texas Instrument, data processing function is powerful, supports the simulation of at least 16 tunnels
Amount acquisition and 32 road programmable digital amounts support that two-way SPI serial ports, 4 road universal serial ports are the cores of whole system operation
Point, the data acquisition of control device, breakdown judge, a distant place communicate etc..
(3) LCD MODULE
The human-computer interaction interface of centralized displaying and the parameter modification of device information.
(4) wireless communication module
Major function is short-distance wireless communication GSM/GPRS (to system main website), by arrester device operation information and event
Barrier alarm signal produces in a wireless form, and both-way communication is carried out with main website.
(5) environment temperature monitoring modular
Pass through temperature sensor acquisition device interior environment temperature
(6) power module
Power module turns DC5V, 12V, 24V Switching Power Supply using AC/DC220V, and stable DC5V power supplys are provided for device,
And reserved DC12V and DC24V power supplys all the way export.
The arrester on-Line Monitor Device major function and feature based on Internet of Things Network Communication of the present invention is as follows：
(1) Leakage Current and reference voltage for acquiring arrester device, calculate arrester crab willow current first harmonics and humorous three times
Wave counts number of lightning strokes and lightning stroke time etc.；
(2) PT units busbar voltage and reference voltage are acquired, busbar voltage fundamental wave and third-harmonic component are calculated；
(3) system clock synchronization is supported；
(4) measurement data and warning message wirelessly upload；
(5) securely and reliably, voltage channel is using isolation V/I transformation, to avoid PT secondary circuit short-circuits, reduces signal and loses
Very；
(6) high-accuracy temperature-humidity sensor is used, it can be with real-time acquisition device inside humiture；
(7) equipment self-inspection；
(8) remote parameter modification and program upgrading；
Important technological parameters
(1) reference voltage measurement range is exchanged：≦500kV；
(2) Leakage Current measures：100 μ A~100mA precision 1%；
(3) capacity current measures：100 μ A~100mA precision 5%；
(4) triple harmonic current：100 μ A~100mA precision 5%；
(5) current in resistance property measures：100 μ A~100mA precision 5%；
(6) current sampling method：Current channel is built-in core-theaded type small electric current sensor sampling mode, and information distortion is small；
(7) voltage sampling mode：(voltage signal of voltage transformer (or experimental transformer instrument winding) passes through wireline mode
Mating V/I transformation active sensor access voltage channels are crossed, as the reference voltage signal)；
(8) power supply mode：AC220V or internal cell；
(9) communication mode：GSM/GPRS (to system main website).
The lightning arrestor on-line monitoring methods based on Internet of Things Network Communication of the present invention are as follows：
Zinc-Oxide Arrester in the process of running, make moist and when surface filth, always let out by the valve block aging inside the arrester
It is little to reveal curent change, but the current in resistance property for accounting for total Leakage Current 10%-20% but greatly increases, therefore current in resistance property could spirit
The deterioration process of quick reflection Zinc-Oxide Arrester.Since the resistance of zinc oxide valve plate has nonlinear wind vibration, the resistance flowed through
Property electric current contain fundamental wave, three times, five times and higher order harmonics, wherein the size of the fundametal compoment of current in resistance property is not by power grid high order
The interference of harmonic wave, and can reliably reflect the degradation of arrester.
For arrester due to being chronically at small area analysis region, the high fdrequency component for flowing through valve block is minimum, can be arrester valve piece
Approximation regards the circuit of a nonlinear resistance and capacitance parallel connection as.The total Leakage Current for flowing through valve block is mainly resistive and capacitive electricity
Flow ingredient, equivalent circuit simulation drawing as shown in Figure 4：
Ix=Ir+Ic, wherein IxFor leakage current, IrFor current in resistance property, IcFor capacity current.
The total Leakage Current of arrester of apparatus of the present invention acquisition, busbar voltage progress is discrete digitized, pass through Fourier
Transform method can acquire electric current, the fundamental wave value of voltage and each in a frequency domain
Subharmonic phase, amplitude.
Network voltage, total Leakage Current all meet Di Liheli conditions, are obtained to busbar voltage Fourier expansion：
In formula, U0For DC voltage value, UkmFor k subharmonic amplitudes, m indicates maximum value, αkFor busbar voltage k subharmonic phases
Angle, ω are angular frequency, and t is initial time, and k is each harmonic component, k=1,2,3 ....
Total Leakage Current Fourier expansion is obtained：
In formula, I0For the DC component of total Leakage Current, IkmFor the k subharmonic amplitudes of total Leakage Current, βkAlways to reveal
The k subharmonic phase angles of electric current.
In low current area, capacitance is almost constant, can be in the hope of total Leakage Current capacitive component by (5-1)：
In above formula, the k subharmonic amplitudes of total Leakage Current capacitive component are：Ickm=k ω CUkm；
Because of busbar voltage and the same phase of Leakage Current resistive composition, each harmonic also same phase, if IrkFor the resistive of k subharmonic
Current amplitude, current in resistance property are：
Again because of ix=ir+ic, (5-2), (5-3), (5-4) substitution are wherein had：
Sin (n ω t+ α are multiplied by the formula both sides (5-5) simultaneouslyn), and definite integral is taken in some cycles, have：
According to the orthogonal property of the product of trigonometric function in one cycle：
For formula (5-6), only in k=n, the definite integral of respective items is not equal to 0, can abbreviation be：
Simplify (5-9) using the product to sum formula of trigonometric function to obtain：
It can be obtained using the orthogonal property of trigonometric function：
：
：
So having：
Irk=Ikmcos(βk-αk)=Ikm[cosαk cosβk+sinαk sinβk] (5-13)
Similarly, cos (n ω t+ α are multiplied by the both sides (5-5) simultaneouslyn), and definite integral is taken in same period, according to triangle
Function orthogonal property, only as k=n, definite integral has the item that is not zero.The each harmonic amount that capacity current can be obtained after abbreviation is：
Ick=Ikmsin(βk-αk)=Ikm[cosαk cosβk-sinαk sinβk] (5-14)
Total Leakage Current is divided into two parts of capacity current value and current in resistance property value, therefore is expressed as from total Leakage Current value
Middle separation；Acquisition busbar voltage acquires total Leakage Current capacitive component also for calculating, and formula can be obtained from formula (5-1) transformation
(5-3) can also embody α in final result formula (5-14)kFor busbar voltage k subharmonic phase angles.
It is each that total current in resistance property value, resistive current first harmonics value and current in resistance property are isolated from total Leakage Current using the method
Subharmonic value, by carrying out longitudinal comparison with previous measured value, can comprehensively comprehensive analysis arrester operating condition.
If the percentage that current in resistance property accounts for total Leakage Current rises appreciably, wherein fundamental wave measured value increasing degree more for the first time
It is larger, and measured value increases unobvious to harmonic wave more for the first time, then can be identified as arrester filth or internal wetted；If current in resistance property accounts for
The percentage of total Leakage Current rises appreciably, wherein harmonic wave is larger compared with measured value increasing degree for the first time, fundamental wave measured value more for the first time
Increase unobvious, it may be determined that be arrester aging.
Failure is adjudicated：
Filthy, internal wetted fault warning：Current in resistance property accounting, fundamental wave increase amplitude, harmonic wave increases amplitude, setting valve 0-
99 can set online.
Arrester aging alerts：Current in resistance property accounting, fundamental wave increase amplitude, harmonic wave increases amplitude, and setting valve 0-99 is online
It can set.
Claims (6)
1. a kind of arrester on-Line Monitor Device based on Internet of Things Network Communication, it is characterised in that：It is described using CPU module as core
The input terminal of CPU module is connected with sampling module, environment temperature detection module and power module, described lightning-arrest using module connection
The current transformer and voltage transformer of device, the temperature sensor of the environment temperature detection module connection arrester, the electricity
Source module connects mains supply；The output end of the CPU module connects LCD MODULE, and the LCD MODULE connects liquid
Crystal display；The CPU module is also associated with communication module and is communicated with communication module, the communication module and intelligent substation
System main website carry out wireless communication.
2. the arrester on-Line Monitor Device according to claim 1 based on Internet of Things Network Communication, it is characterised in that：Described
Sampling module includes the current transformer and voltage transformer, active second-order filter circuit, ADC converters of arrester, the ADC
Converter is the converter that analog quantity is converted to digital quantity, and the ADC converters are carried out using hardware phase lock high precision loop technique with frequency
Acquisition, 128 sampled points of each frequency cycle designed for analysis metering leakage current third-harmonic component.
3. a kind of lightning arrestor on-line monitoring methods based on Internet of Things Network Communication, it is characterised in that：Including：
The first step measures the arrester lower end connection midpoint of three-phase to total leakage current on ground：By the arrester upper end of three-phase point
Not Lian Jie three phase network busbar, the arrester lower end of three-phase links together as connection midpoint, and by the connection midpoint to,
By current transformer acquire the connection midpoint to ground total leakage current, when the insulation performance of the arrester of three-phase is normal,
The sum of the triple-frequency harmonics of three-phase leakage current very little, when certain phase arrester breaks down, the fundamental wave component of each phase leakage current
Phase-amplitude can change, and cause each component that can not cancel out each other so that total leakage current values increase substantially, this is always let out
The characteristic quantity that the value added of leakage current is diagnosed as surge arrester failure；
Second step, using the resistive current first harmonics component of total leakage current as the characteristic quantity of reflection arrester deterioration process：It is lightning-arrest
Device in the process of running, make moist and when surface filth, total leakage current variation is little, but accounts for and always let out by internal valve block aging
The current in resistance property of leakage current 10-20% but greatly increases, therefore current in resistance property could the sensitive deterioration process for reflecting arrester；Due to
The resistance of arrester zinc oxide valve plate has a nonlinear wind vibration, the current in resistance property flowed through contain fundamental wave, three times, five times and more
The fundametal compoment size of higher hamonic wave, wherein current in resistance property is not interfered by Electric Network Higher Harmonic, and can reflect the bad of arrester
Change process；For arrester due to being chronically at small area analysis region, the high fdrequency component for flowing through valve block is minimum, can arrester valve piece is close
The circuit for seemingly regarding a nonlinear resistance and capacitance parallel connection as, the total Leakage Current for flowing through valve block is mainly current in resistance property and capacitive
Current component；
Third walks, and busbar voltage is acquired by voltage transformer；
4th step, the total leakage current of the arrester of acquisition and busbar voltage progress is discrete digitized, existed by Fourier transformation
Total leakage current and the fundamental wave value of busbar voltage and the phase and amplitude of each harmonic are acquired in frequency domain, and electric from total leakage in real time
Total current in resistance property value, resistive current first harmonics value and current in resistance property each harmonic value in real time are isolated in stream；
5th step, total current in resistance property value, resistive current first harmonics value and the current in resistance property isolated in real-time total leakage current is each
The subharmonic value total current in resistance property value previous with arrester, resistive current first harmonics value and current in resistance property each harmonic value carry out longitudinal
Compare, if the percentage that current in resistance property accounts for total Leakage Current rises appreciably, wherein fundamental wave more for the first time measured value increasing degree compared with
Greatly, the harmonic wave unobvious of measured value growth more for the first time then can be identified as arrester filth or internal wetted；If current in resistance property accounts for always
The percentage of Leakage Current rises appreciably, wherein harmonic wave is larger compared with measured value increasing degree for the first time, and measured value increases fundamental wave more for the first time
Long unobvious, it may be determined that be arrester aging.
4. the lightning arrestor on-line monitoring methods according to claim 3 based on Internet of Things Network Communication, it is characterised in that：Described
The total leakage current of the arrester of acquisition, busbar voltage are carried out discrete digitized referring to by the total leakage current of arrester, busbar electricity
The discrete signal of pressure is digitized so that the functional value of discrete signal only takes finite value.
5. the lightning arrestor on-line monitoring methods according to claim 3 based on Internet of Things Network Communication, it is characterised in that：It is described to incite somebody to action
The total leakage current of arrester and the busbar voltage progress of acquisition are discrete digitized, by Fourier transformation and operation, in a frequency domain
Total leakage current and the fundamental wave value of busbar voltage and the phase and amplitude of each harmonic are acquired, specifically：
Network voltage, total Leakage Current all meet Di Liheli conditions, are obtained to busbar voltage Fourier expansion：
In formula, U0For DC voltage value, UkmFor k subharmonic amplitudes, m indicates maximum value, αkFor busbar voltage k subharmonic phase angles, ω
For angular frequency, t is initial time, and k is each harmonic component, k=1,2,3 ....
Total Leakage Current Fourier expansion is obtained：
In formula, I0For the DC component of total Leakage Current, IkmFor the k subharmonic amplitudes of total Leakage Current, βkFor total Leakage Current
K subharmonic phase angles.
In low current area, capacitance is almost constant, can be in the hope of total Leakage Current capacitive component by (5-1)：
In above formula, the k subharmonic amplitudes of total Leakage Current capacitive component are：Ickm=k ω CUkm；
Because of busbar voltage and the same phase of Leakage Current resistive composition, each harmonic also same phase, if IrkFor the current in resistance property of k subharmonic
Amplitude, current in resistance property are：
Again because of ix=ir+ic, (5-2), (5-3), (5-4) substitution are wherein had：
Sin (n ω t+ α are multiplied by the formula both sides (5-5) simultaneouslyn), and definite integral is taken in some cycles, have：
According to the orthogonal property of the product of trigonometric function in one cycle：
For formula (5-6), only in k=n, the definite integral of respective items is not equal to 0, can abbreviation be：
Simplify (5-9) using the product to sum formula of trigonometric function to obtain：
It can be obtained using the orthogonal property of trigonometric function：
：
：
So having：
Irk=Ikmcos(βk-αk)=Ikm[cosαkcosβk+sinαksinβk] (5-13)
Similarly, cos (n ω t+ α are multiplied by the both sides (5-5) simultaneouslyn), and definite integral is taken in same period, just according to trigonometric function
Characteristic is handed over, only as k=n, definite integral has the item that is not zero.The each harmonic amount that capacity current can be obtained after abbreviation is：
Ick=Ikmsin(βk-αk)=Ikm[cosαkcosβk-sinαksinβk] (5-14)
It is humorous that total current in resistance property value, resistive current first harmonics value and each time of current in resistance property are isolated from total Leakage Current using the method
Wave number；
Total Leakage Current is divided into two parts of capacity current value and current in resistance property value, therefore is detached from total Leakage Current value；It adopts
It is to acquire total Leakage Current capacitive component to calculate to collect busbar voltage, can obtain formula (5-3) from formula (5-1) transformation, finally
As a result it is embodied in formula (5-14) and arrives αkFor busbar voltage k subharmonic phase angles.
6. the lightning arrestor on-line monitoring methods according to claim 3 based on Internet of Things Network Communication, it is characterised in that：It is filthy and
When internal wetted fault warning, current in resistance property accounting, fundamental wave increase amplitude and the setting valve 0-99 of harmonic wave growth amplitude online may be used
If；When arrester aging alerts, current in resistance property accounting, fundamental wave increase amplitude and the setting valve 0-99 of harmonic wave growth amplitude online may be used
If.
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| CN110361616A (en) * | 2019-07-24 | 2019-10-22 | 陕西世翔电子科技有限公司 | Arrester based on Internet of Things monitors platform on-line |
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| CN111650546A (en) * | 2020-05-25 | 2020-09-11 | 武汉华瑞智深电气技术有限公司 | Online monitoring system and method for effectively preventing explosion of voltage transformer |
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| CN112977542A (en) * | 2021-03-22 | 2021-06-18 | 北京中车赛德铁道电气科技有限公司 | High-voltage equipment on-line monitoring method for high-speed rail train |
| CN114002475A (en) * | 2021-10-22 | 2022-02-01 | 深圳抛物线科技有限公司 | Lightning arrester resistive current on-line monitoring method |
| CN114002475B (en) * | 2021-10-22 | 2024-03-29 | 深圳抛物线科技有限公司 | Online monitoring method for resistive current of lightning arrester |
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