CN110196356A - Passive type dielectric spectroscopy on-line measurement analysis system and method - Google Patents
Passive type dielectric spectroscopy on-line measurement analysis system and method Download PDFInfo
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- CN110196356A CN110196356A CN201910411814.7A CN201910411814A CN110196356A CN 110196356 A CN110196356 A CN 110196356A CN 201910411814 A CN201910411814 A CN 201910411814A CN 110196356 A CN110196356 A CN 110196356A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2617—Measuring dielectric properties, e.g. constants
- G01R27/2623—Measuring-systems or electronic circuits
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Abstract
The invention discloses a kind of passive type dielectric spectroscopy on-line measurements and analysis system rewarding and punishing, including voltage data acquisition system, current data acquisition system and host, wherein: the voltage data acquisition system is acted on using the partial pressure of CVT high-voltage arm and low-voltage arm and carries out voltage data acquisition, the voltage data acquisition system includes voltage data acquisition module, and the data collection terminal of voltage data acquisition module is connected to high voltage arm capacitor C1With low-voltage arm capacitor C2Between, the output end of voltage data acquisition module is connected to host by optical fiber；The present invention is non-invasively using the higher hamonic wave of grid disturbance and system itself as the driving source of different frequency, obtain the response current under corresponding excitation, the FDS data of equipment are effectively analyzed, to realize on-line monitoring and the assessment of power equipment paper oil insulation state.
Description
Technical field
The invention belongs to evaluating status of electric power field more particularly to a kind of passive type dielectric spectroscopy on-line measurements point
Analysis system and method.
Background technique
Since 21 century, Chinese national economy is fast-developing, and demand of all trades and professions to electric energy persistently increases, and pushes electric power
Installed capacity and power grid scale do not infer expansion.And the safe and stable operation of electric system is to guarantee that high-quality, reliable electric power supplies
The basis answered is the important leverage of the national economic development.Electric network from collapsing and large area blackout not only result in huge warp
Ji loss, can also endanger public security, influence people's normal life, cause serious social loss.State Grid Corporation of China's operation
Statistical analysis show during operation of power networks because power transmission and transforming equipment failure cause power outage account for total number of accident 37%~
48%, failure cause first is occupy, and the power equipments such as large-scale power transformer, bushing are to operation of power networks stability
Influence it is the most prominent.
Oil-paper combination insulation is widely used in big because having many advantages, such as good insulation performance and excellent heat dissipation performance
In the oil-immersed type powers equipment such as type power transformer, bushing, the insulation status and healthy water of these power equipments are straight
Connect the safety and stablization operation for being related to power grid.Currently, China, which has more oil paper insulation electrical equipment operation, is up to decades,
These equipment are faced with the insulation ageing problem got worse, and the probability that accident occurs is continuously increased.Dielectric spectroscopy method
(Frequency Domain Spectroscopy, FDS) is a kind of lossless detection method of paper oil insulation equipment, has test
Voltage is low, on-the-spot test strong interference immunity, obtains the advantages of insulation abundant information, thus it is exhausted to be widely used in paper oil insulation equipment
The on-site test and assessment of edge state, and its validity has been widely recognized.
But existing FDS test method can only carry out off-line measurement after power failure, can not achieve apparatus insulated state
Online evaluation and real-time early warning.Off-line measurement not only operate it is more complicated, but also have a power failure can bring certain economic loss.
Summary of the invention
In order to solve the problems in the existing technology, the purpose of the present invention is utilizing grid disturbance and harmonic component, if
It counts a kind of passive type dielectric spectroscopy on-line measurement and analysis system, the present invention non-invasively utilizes grid disturbance and system sheet
Driving source of the higher hamonic wave of body as different frequency obtains the response current under corresponding excitation, carries out to the FDS data of equipment
Effectively analysis, to realize on-line monitoring and the assessment of power equipment paper oil insulation state.
To achieve the goals above, the present invention adopts the following technical scheme: passive type dielectric spectroscopy on-line measurement is analyzed
System, including voltage data acquisition system, current data acquisition system and host, in which:
The voltage data acquisition system is acted on using the partial pressure of CVT high-voltage arm and low-voltage arm and carries out voltage data acquisition,
The voltage data acquisition system includes voltage data acquisition module, and the data collection terminal connection of voltage data acquisition module is supreme
Pressure arm capacitor C1With low-voltage arm capacitor C2Between, the output end of voltage data acquisition module is connected to host by optical fiber；
The current data acquisition system includes current data acquisition module and current sensor, the current sensor set
Enter the end shield of capacitance type equipment over the ground in lead, the current data acquisition module is for obtaining the electric current that current sensor measures
Data, and current data is sent to host；
The host calculates relative medium loss for receiving voltage data and current data, and according to the data received
Factor.
The invention also discloses a kind of passive type dielectric spectroscopy on-line measurement analysis methods, non-invasively utilize power grid
Driving source of the disturbance and higher hamonic wave of itself as different frequency realizes the FDS on-line measurement of paper oil insulation equipment.
When there are the voltage signals for when higher hamonic wave, acquiring power equipment and electric current to believe in power grid generation disturbance or system
Number, and incoming host is handled simultaneously by voltage signal and current signal, the data under each frequency gradually accumulate at any time, most
The FDS on-line measurement of power equipment is realized eventually.
Voltage and current signal after sensor acquires, using host-processor respectively to two paths of signals synchronize acquisition and
Conditioning is finally analyzed and processed the signal of total digitalization, is extracted under different frequency by Fourier transform with degree of precision
Voltage, the phase of electric current, amplitude information, obtain the phase of voltage signaluAnd the phase of current signali, damaged according to medium
Consume angle tangent calculation formula:
To calculate the relative medium loss factor under the frequency.
It is further comprising the steps of, with the gradually acquisition and accumulation of voltage and current signal under each frequency, draw out
The FDS curve of paper oil insulation equipment.
It is further comprising the steps of, the FDS data of power equipment to be measured and insulation condition diagnosis result are uploaded to cloud
Server.
It is further comprising the steps of, by the data in the FDS data of power equipment to be measured and electric power internet cloud server
It compares and analyzes, realizes the online evaluation of equipment paper oil insulation state.
Compared with prior art, the present invention is non-invasively using the disturbance of power grid itself and higher hamonic wave as different frequencies
The driving source of rate, obtains paper oil insulation equipment response current corresponding under different frequency voltage, and by the voltage measured and
Current signal is passed to host, by carrying out the FDS on-line measurement result that processing analysis obtains paper oil insulation equipment to data.Together
When, using mobile interchange technology, the FDS data measured are uploaded onto the server in real time, establish the database of opening and shares, realized
Effective accumulation of FDS data, and by artificial intelligence, cloud computing and big data analysis means, the FDS data of equipment are carried out
Effectively analysis, to realize on-line monitoring and the assessment of power equipment paper oil insulation state.
In the present invention, disturbance and the higher hamonic wave signal of itself for power grid, using capacitance type potential transformer
The method of (Capacitance type voltage transformer) transformation realizes electricity without the intermediate transformer of CVT
The acquisition for pressing signal avoids influence of the electromagnetic coupling in the process to voltage-phase；When acquiring the response current under different excitations, lead to
It crosses and the end shield ground connection of capacitance type equipment is transformed, and design current sensor, current data is transmitted to system host；System
System host carries out conditioning analysis to collected voltage and current signal respectively, obtains its phase, amplitude information with higher precision,
To calculate the FDS data of power equipment paper oil insulation；Institute's measured data upload onto the server it is abundant, improve the same of database
When, it is compared with the result accumulated in database, effective assessment finally is made to equipment paper oil insulation state, it is real
The on-line monitoring of its existing state of insulation, and timely, effective early warning is made to the accident that may occur；The surveyed number of each place power grid
According to cloud is uploaded to, the database of an opening and shares is constituted, and be constantly modified and perfect, realization various regions electricity to data
The establishment of the electric power internet of equipment interconnection, information sharing in net.
In addition, the present invention uses the big data analysis method based on artificial intelligence technology, by measured FDS data and number
It is compared and analyzed according to mass data accumulated in library, realizes on-line checking and the assessment of paper oil insulation state, be based on Internet of Things
The FDS data of equipment are uploaded to cloud database by network technology in real time, constantly improve database, while being carried out to data continuous
Amendment realizes the electric power in the power grid of various regions to improve the efficiency of paper oil insulation status assessment and the accuracy of assessment result
Equipment digitalized, information-based connection, component devices interconnection, information sharing electric power internet, make Operation of Electric Systems management more
Add stability and high efficiency.
The present invention realizes on-line monitoring and the assessment of power equipment paper oil insulation state, and makes standard to apparatus insulated failure
Really and timely early warning, using mobile interchange technology, the electric power internet of equipment interconnection, information sharing between each power grid is set up,
The FDS data measured are uploaded onto the server in real time, constantly improve oil paper insulation electrical equipment FDS database, raising state is commented
The efficiency and accuracy estimated.
Detailed description of the invention
Fig. 1 is voltage signal acquisition schematic diagram of the present invention；
Fig. 2 is current signal acquisition mode schematic diagram；
Fig. 3 is the on-line measurement of passive type dielectric spectroscopy and analysis system block diagram；
Fig. 4 is electric power internet schematic diagram.
Specific embodiment
The present invention is made with detailed description below in conjunction with attached drawing and example.
As depicted in figs. 1 and 2, passive type dielectric spectroscopy on-line measurement analysis system of the invention, including voltage data
Acquisition system, current data acquisition system and host, in which:
The voltage data acquisition system is acted on using the partial pressure of CVT high-voltage arm and low-voltage arm and carries out voltage data acquisition,
The voltage data acquisition system includes voltage data acquisition module, and the data collection terminal connection of voltage data acquisition module is supreme
Pressure arm capacitor C1With low-voltage arm capacitor C2Between, the output end of voltage data acquisition module is connected to host by optical fiber；
The current data acquisition system includes current data acquisition module and current sensor, the current sensor set
Enter the end shield of capacitance type equipment over the ground in lead, the current data acquisition module is for obtaining the electric current that current sensor measures
Data, and current data is sent to host；
The host calculates relative medium loss for receiving voltage data and current data, and according to the data received
Factor.
Grid disturbance is electric system transient process because of caused by operation or failure, such as capacitor switching, motor start and stop, thunder
It hits, short circuit and breaker actuation etc..The higher hamonic wave of grid disturbance and system itself frequency content rich in, substantially may be used
Cover the band limits of FDS measurement: lightning impulse (10Hz -1MHz), system short-circuit fault (kHz), neutral point potential lifting
(mHz -10Hz), and there is the asymmetrical characteristic of three-phase, it is lower in view of voltage needed for causing power equipment dielectric response,
The excitation that fundamental component non-in power grid can be measured as paper oil insulation equipment FDS, realize the on-line measurement of dielectric spectroscopy with
Analysis.
The present invention is transformed the CVT of substation field, directly using the partial pressure of CVT high-voltage arm and low-voltage arm act on into
The acquisition of row voltage data.The acquisition mode of voltage signal referring to Fig. 1, the capacitance partial pressure part of CVT is transformed, thus
It is used as capacitive divider, carries out voltage letter using data acquisition module directly from the low-voltage arm capacitor C2 of capacitive divider
Number acquisition, and by optical fiber be passed to host carry out data processing, so as to avoid the complex operations of in-site measurement.It tests at the scene
In, the high voltage arm capacitor C1 and low-voltage arm capacitor C2 of CVT can be measured accurately, and the influence of stray capacitance is relative constant
, therefore the capacitive divider has stable intrinsic standoff ratio, can satisfy in the present invention and adopts to harmonic wave and transient voltage signal
The required precision of collection.The acquisition mode of current signal please refers to Fig. 2.Since the end shield (or low-pressure end) of capacitance type equipment mostly exists
It is directly grounded in secondary terminal box on its ontology or inside equipment, it is difficult to directly acquire its earth current, it is therefore desirable in advance
Its end shield ground connection is transformed, current sensor is inserted in end shield over the ground in lead, and by sampling unit by current data
It is transferred to test host.
As shown in figure 3, the invention also discloses a kind of passive type dielectric spectroscopy on-line measurement analysis method, Noninvasive
Land productivity use power grid itself disturbance and higher hamonic wave as different frequency driving source, realize paper oil insulation equipment FDS exist
Line measurement.
When there are the voltage signals for when higher hamonic wave, acquiring power equipment and electric current to believe in power grid generation disturbance or system
Number, and incoming host is handled simultaneously by voltage signal and current signal, the data under each frequency gradually accumulate at any time, most
The FDS on-line measurement of power equipment is realized eventually.
Voltage and current signal after sensor acquires, using host-processor respectively to two paths of signals synchronize acquisition and
Conditioning is finally analyzed and processed the signal of total digitalization, is extracted under different frequency by Fourier transform with degree of precision
Voltage, the phase of electric current, amplitude information, obtain the phase of voltage signaluAnd the phase of current signali, damaged according to medium
Consume angle tangent calculation formula:
To calculate relative medium loss factor under the frequency, with voltage under each frequency and current signal
It gradually obtains and accumulates, draw out the FDS curve of paper oil insulation equipment；By the FDS data of power equipment to be measured and insulation shape
State diagnostic result is uploaded to cloud server, will be in the FDS data of power equipment to be measured and electric power internet cloud server
Data compare and analyze, and realize the online evaluation of equipment paper oil insulation state.
The present invention non-invasively using the disturbance of power grid itself and higher hamonic wave as the driving source of different frequency, obtains
Paper oil insulation equipment response current corresponding under different frequency voltage, and the voltage and current signal measured is passed to master
Machine, by carrying out the FDS on-line measurement result that processing analysis obtains paper oil insulation equipment to data.Meanwhile utilizing mobile interchange
Technology uploads onto the server the FDS data measured in real time, realizes the accumulation of FDS data and the perfect and each electricity of database
The equipment of net interconnects and information sharing, and by artificial intelligence and big data analysis means, has to the FDS data of equipment
Effect analysis, to realize on-line monitoring and the assessment of power equipment paper oil insulation state, makes timely standard to apparatus insulated failure
True early warning.
In a certain embodiment of the invention, by establishing the cloud server of each place power grid opening and shares, measuring
After paper oil insulation equipment FDS data, the data obtained is uploaded to server by measuring system in real time, to set up an information content
Huge, the FDS database containing the various paper oil insulation equipment of various regions power grid, while the oil of the scene according to corresponding to FDS curve
The apparatus insulated state of paper insulation, constantly to the curve in database be modified with it is perfect, thus step up on-line monitoring and
The efficiency and order of accuarcy of assessment.
It, can be abundant, accurate with what is stored in database while FDS data are uploaded to database by each place power grid
Intellectual analysis is carried out to equipment paper oil insulation state based on FDS data.After measuring FDS data online, designed by the present invention
System by artificial intelligence, cloud computing and big data analysis means, using the big data analysis based on artificial intelligence technology
Method clusters FDS data, association analysis, classification and prediction are handled, using deep learning algorithm to power equipment oil
Paper insulation state carries out intelligent diagnostics and assessment.When discovering device insulate there may be when defect, system is initiatively to equipment pipe
Reason personnel issue warning signal, and realize paper oil insulation state on_line monitoring and real-time early warning.
In a certain embodiment of the invention, centered on cloud database, each place power grid group is built up into an equipment
The electric power internet of interconnection, information sharing.The power equipment paper oil insulation fault message once occurred in power grid A, including electric power
Device type and model, FDS curve, fault diagnosis result etc. will be stored in cloud server, if identical equipment in power grid D
Similar failure occurs, system will carry out fast and accurately fault distinguishing according to the information stored in database, to mention significantly
The efficiency of high power equipment management and the stability of Operation of Electric Systems.
As shown in figure 4, various regions power grid shares a cloud server, the FDS data of each grid equipment are uploaded to clothes simultaneously
It is engaged in device, and carries out using wherein database the assessment and diagnosis of apparatus insulated state, realize the equipment interconnection of various regions power grid and believe
Breath is shared.
Claims (7)
1. passive type dielectric spectroscopy on-line measurement analysis system, which is characterized in that including voltage data acquisition system, electric current number
According to acquisition system and host, in which:
The voltage data acquisition system is acted on using the partial pressure of CVT high-voltage arm and low-voltage arm carries out voltage data acquisition, described
Voltage data acquisition system includes voltage data acquisition module, and the data collection terminal of voltage data acquisition module is connected to high-voltage arm
Capacitor C1With low-voltage arm capacitor C2Between, the output end of voltage data acquisition module is connected to host by optical fiber；
The current data acquisition system includes current data acquisition module and current sensor, and the current sensor is inserted in electricity
The end shield of capacitive equipment is over the ground in lead, and the current data acquisition module is for obtaining the electric current number that current sensor measures
According to, and current data is sent to host；
The host for receiving voltage data and current data, and according to the data received calculate relative medium loss because
Number.
2. passive type dielectric spectroscopy on-line measurement analysis method, which is characterized in that non-invasively disturbing using power grid itself
Driving source of the dynamic and higher hamonic wave as different frequency, realizes the FDS on-line measurement of paper oil insulation equipment.
3. passive type dielectric spectroscopy on-line measurement analysis method according to claim 2, which is characterized in that when power grid is sent out
There are the voltage signals and current signal that when higher hamonic wave, acquire power equipment in raw disturbance or system, and by voltage signal and
Incoming host is handled current signal simultaneously, and the data under each frequency gradually accumulate at any time, final realization power equipment
FDS on-line measurement.
4. passive type dielectric spectroscopy on-line measurement analysis method according to claim 3, which is characterized in that voltage and current
Signal synchronizes acquisition and conditioning to two paths of signals respectively after sensor acquires, using host-processor, finally to total
The signal of word is analyzed and processed, by Fourier transform with degree of precision extract different frequency under voltage, electric current phase,
Amplitude information obtains the phase of voltage signaluAnd the phase of current signali, calculated according to dielectric loss angle tangent public
Formula:
To calculate the relative medium loss factor under the frequency.
5. passive type dielectric spectroscopy on-line measurement analysis method according to claim 4, which is characterized in that further include with
Lower step draws out the FDS of paper oil insulation equipment with the gradually acquisition and accumulation of voltage and current signal under each frequency
Curve.
6. passive type dielectric spectroscopy on-line measurement analysis method according to claim 3, which is characterized in that further include with
The FDS data of power equipment to be measured and insulation condition diagnosis result are uploaded to cloud server by lower step.
7. passive type dielectric spectroscopy on-line measurement analysis method according to claim 6, which is characterized in that further include with
Lower step compares and analyzes the FDS data of power equipment to be measured and the data in electric power internet cloud server, realizes
The online evaluation of equipment paper oil insulation state.
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| CN110824405A (en) * | 2019-10-30 | 2020-02-21 | 国网新疆电力有限公司哈密供电公司 | System and method for detecting amplitude-frequency characteristics of capacitor voltage transformer |
| CN111896849A (en) * | 2020-06-28 | 2020-11-06 | 国网江苏省电力有限公司电力科学研究院 | Oil paper insulation performance analysis method and device considering non-uniform medium |
| CN113447537A (en) * | 2021-06-25 | 2021-09-28 | 海南电网有限责任公司电力科学研究院 | Oiled paper insulation frequency domain dielectric spectrum measuring method and device, storage medium and terminal |
| CN113848525A (en) * | 2021-09-22 | 2021-12-28 | 云南电网有限责任公司电力科学研究院 | Intelligent monitoring device for CVT metering error state |
| CN113985139A (en) * | 2021-10-15 | 2022-01-28 | 国网电力科学研究院武汉南瑞有限责任公司 | Frequency domain dielectric response measuring device and method for valve side sleeve of converter transformer |
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| CN110824405A (en) * | 2019-10-30 | 2020-02-21 | 国网新疆电力有限公司哈密供电公司 | System and method for detecting amplitude-frequency characteristics of capacitor voltage transformer |
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| CN111896849B (en) * | 2020-06-28 | 2023-03-10 | 国网江苏省电力有限公司电力科学研究院 | Oil paper insulation performance analysis method and device considering non-uniform medium |
| CN113447537A (en) * | 2021-06-25 | 2021-09-28 | 海南电网有限责任公司电力科学研究院 | Oiled paper insulation frequency domain dielectric spectrum measuring method and device, storage medium and terminal |
| CN113848525A (en) * | 2021-09-22 | 2021-12-28 | 云南电网有限责任公司电力科学研究院 | Intelligent monitoring device for CVT metering error state |
| CN113985139A (en) * | 2021-10-15 | 2022-01-28 | 国网电力科学研究院武汉南瑞有限责任公司 | Frequency domain dielectric response measuring device and method for valve side sleeve of converter transformer |
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