CN108459295A - CVT on-line monitoring systems and method based on distributed data acquisition processing - Google Patents
CVT on-line monitoring systems and method based on distributed data acquisition processing Download PDFInfo
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- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The present invention relates to intelligent grid equipment real-time data acquisition and processing, on-line monitoring technique field, specifically a kind of CVT on-line monitoring systems and method and monitoring method based on distributed data acquisition processing.Monitoring system includes standard signal converter unit, high frequency time data acquisition process unit and terminal industrial computer successively, and the analysis software for carrying out CVT operating statuses assessment and fault diagnosis is equipped on the terminal industrial computer；Monitoring method uses the Least Square Recurrence Parameter Estimation Method with forgetting factor.Present invention is mainly used for the operation conditions of the CVT to substation to carry out real time on-line monitoring.
Description
Technical field
It is specifically a kind of the present invention relates to intelligent grid equipment real-time data acquisition and processing, on-line monitoring technique field
CVT on-line monitoring systems and method based on distributed data acquisition processing and monitoring method.
Background technology
CVT, full name capacitance type potential transformer are the key equipments of intelligent substation, are mainly used for a high voltage
It is changed into low-voltage by certain ratio.CVT has ensured that the stable operation of electric system, the quality of operating status are directly related to
The accuracy of electrical quantities measurement.Currently, CVT need to be accumulated in design and the upper experience of operation, a large amount of operation datas show that it is transported
Row and the stability measured and reliability are also to be verified, will be to the peace of electric system if breakdown fault occurs in CVT in operation
Row for the national games brings hidden danger, it is therefore necessary to carry out real time on-line monitoring to its operation conditions, realize its on-line fault diagnosis, ability
Debugging in time ensures normal operation.Existing CVT real-time watch devices are simultaneously immature, and monitoring effect is unreliable.In addition,
In intelligent substation, in general CVT quantity is more, if introducing independent CVT monitoring devices to monitor single CVT, needs
A large amount of cost is expended, and is implemented extremely complex.
Invention content
Present invention seek to address that CVT on-line monitorings are unreliable in the prior art and cost is excessively high, logical when monitoring multiple CVT
The excessive technical problem of letter data calculation amount.For this purpose, the present invention proposes that a kind of CVT handled based on distributed data acquisition is online
System and method is monitored, the data acquisition and procession of CVT operating statuses is distributed in multiple distributed data acquisition processing cards,
It, can be comprehensive to the operation data with operating status of multiple CVT in intelligent substation to reduce transmission and the treating capacity of data
It closes and carries out high speed, real-time, accurately monitoring.
The technical solution adopted by the present invention to solve the technical problems is：
A kind of CVT on-line monitoring systems based on distributed data acquisition processing include standard signal converter unit, high frequency successively
Secondary data acquisition process unit and terminal industrial computer are equipped with for carrying out CVT operations on the terminal industrial computer
The analysis software of status assessment and fault diagnosis；Standard signal converter unit, including multiple PT, multiple PT respectively with it is multiple
The output end of CVT is correspondingly connected with, and PT is used to be transformed to be suitable at the high frequency time data acquisition by the analog output signal of CVT
Manage the analog signal of unit input range；High frequency time data acquisition process unit, including it is corresponding with the output end of multiple PT respectively
Multiple distributed data acquisitions processing card of connection, three-phase of each distributed data acquisition processing card for acquiring a CVT
Voltage signal, the distributed data acquisition processing card includes the Signal-regulated kinase being sequentially connected electrically, A/D conversion module sum numbers
According to processing module；The Signal-regulated kinase is used to amplify the useful signal of acquisition, filters out high-frequency noise, isolation high voltage surge with
Common mode interference；The A/D conversion modules are used to the analog signal of conditioned mistake being converted to digital signal, and are sent to the number
According to processing module；The digital signal that the data processing module is used to send the A/D conversion modules is handled, to big
Data volume is had compressed greatly, the result for handling completion is sent to bus group packet communication module；The high frequency time data acquisition process list
Member further includes synchronous trigger module and bus group packet communication module, and the synchronous trigger module is used for the A/D conversion modules
Send synchronizing signal, to ensure that multiple distributed data acquisitions handle card synchronized sampling, the bus group packet communication module is used for
The signal group packet received from the processing clamping of each distributed data acquisition is sent；Terminal computer is logical with the bus group packet
Module electrical connection is believed, to the operating status that receives, analyze the signal received and show CTV as a result, completing CVT operation troubles
Monitoring, and data are saved into database convenient for checking and reappearing operation conditions in real time.Here so-called pulse per second (PPS), i.e. PPS.
The present invention also provides a kind of monitoring methods applied in above-mentioned analysis software, it is characterised in that uses band and forgets
The Least Square Recurrence Parameter Estimation Method of the factor, specifically includes following steps：
Step 1：It establishes single distributed data acquisition processing and blocks the recursion of collected CVT secondary sides A, B, C three-phase signal most
Small two multiply model, setting estimation parameter,
For being individually spaced CVT, the recursive least-squares model of the CVT secondary sides signal is：
,
Wherein,、、A, B, C three-phase secondary voltage of respectively CVT,For parameter to be estimated；
Step 2：Initialization.To observation sequence length N and forgetting factorAssignment,Between 0 and 1；
Step 3：To parameter to be estimatedWithAssign initial value.Initial time value,；N groups are obtained to adopt in real time
The CVT output voltages of collection；
Step 4：One group of new CVT output three-phase voltage acquired in real time is obtained, voltage observing matrix is generated；WhereinIt is the output of CVT three-phasesIn the observation at current time
Value,It is the output of CVT three-phasesObservation before n-hour；
Step 5：Calculate current time gain matrixAnd observing matrixCovariance matrix：
；
Step 6：The estimation parameter that update CVT secondary side A phases export
Step 7：Calculate current time evaluation function, and judge it whether close to 0；
If its evaluation functionLess than given threshold close to 0, then it is assumed that assessment parameter is effective, and sequence executes step 8；It is no
Then turn to step 4；
Step 8：The parameter estimated, as measuringEstimated value, calculate the estimated value three
Mutually exportWith the difference of the reference voltage of artificial settings, if the difference is more than preset threshold value, phase CVT
Capacitance has breakdown possibility, sends out fault alarm.
The beneficial effects of the invention are as follows：The present invention provides a kind of CVT on-line monitorings handled based on distributed data acquisition
System, is provided with multiple PT, each PT successively with Signal-regulated kinase, A/D conversion modules, synchronous trigger module, data processing
Module is electrically connected to form the propagation ducts of single CVT signals, can realize the analytic operation of the three-phase signal of single CVT, then
Terminal industrial computer is issued after the operation result of all propagation ducts is summarized, and substantially reduces the operation of terminal industrial machine
Amount, can realize it is comprehensive simultaneously to the operation data Yu operating status of multiple CVT in Intelligent transformer station carry out high speed, it is real-time,
Accurately monitoring, it is convenient and reliable；The present invention also provides a kind of monitoring methods of CVT, minimum using the recursion containing forgetting factor
Square law can effectively reduce the influence of CVT internal structures and systematic error to measurement accuracy, and algorithm is simple, can reduce meter
Calculation amount reduces the memory that data occupy in a computer, and arithmetic speed is fast, precision is high.
Description of the drawings
Fig. 1 is the operation principle structural schematic diagram of the CVT on-line monitoring systems of the present invention；
Fig. 2 is the signal monitoring system structure diagram of the present invention being individually spaced；
Fig. 3 is the circuit diagram of the Signal-regulated kinase of the present invention；
Fig. 4 is the high frequency time data acquisition process unit connection panel schematic diagram of the present invention；
Fig. 5 is the structural schematic diagram of the analysis software of the present invention；
Fig. 6 is the monitoring method flow chart of CTV provided by the invention.
Specific implementation mode
- Fig. 2 referring to Fig.1, the CVT on-line monitoring systems of the invention based on distributed data acquisition processing include successively
Standard signal converter unit I, high frequency time data acquisition process unit II and terminal industrial computer, the terminal industrial computer
On be equipped with for carry out CVT operating statuses assessment and fault diagnosis analysis software；Standard signal converter unit I, including it is more
The output end of a PT, multiple PT respectively with multiple CVT is correspondingly connected with, and PT is for the analog output signal of CVT to be transformed to
Analog signal suitable for the high frequency time data acquisition process unit II input range；High frequency time data acquisition process unit
II, including multiple distributed data acquisitions processing card III for being correspondingly connected with respectively with the output end of multiple PT, each distribution number
Be used to acquire the three-phase voltage signal of one CVT according to acquisition and processing card III, the distributed data acquisition processing block III include according to
Signal-regulated kinase, A/D conversion modules and the data processing module of secondary electrical connection；The Signal-regulated kinase is acquired for amplifying
Useful signal, filter out high-frequency noise, high voltage surge and common mode interference be isolated；The A/D conversion modules are used for conditioned mistake
Analog signal be converted to digital signal, and be sent to the data processing module；The data processing module is used for described
The digital signal that A/D conversion modules are sent is handled, and the signal for handling completion is sent to bus group packet communication module；The height
Frequency data acquisition process unit II further includes synchronous trigger module and bus group packet communication module, and the synchronous trigger module is used
It is described in sending synchronizing signal, to the A/D conversion modules to ensure multiple distributed data acquisitions processing III synchronized samplings of card
Bus group packet communication module is used to send the signal group packet received from each distributed data acquisition processing card III；Terminal meter
Calculation machine is electrically connected with the bus group packet communication module, to receive, analyze the signal received and the operating status for showing CTV
As a result, completing the monitoring of CVT operation troubles, and data are saved into database convenient for checking and reappearing operation conditions in real time.
As a further improvement of the above technical scheme, the distributed data acquisition processing card is assisted based on DSP and FPGA
With exploitation, the A/D conversion modules are developed based on FPGA, and the data processing module is developed based on DSP, i.e.,：Data processing mould
Block uses DSP data processing modules.Further, the high frequency time data acquisition process unit II further includes fpga chip, institute
It states synchronous trigger module and sends pulse per second (PPS) to synchronization signal bus, the fpga chip receives and responds the pulse per second (PPS) and controls
The A/D conversion modules of different distributions formula data acquisition process card III processed follow pulse per second (PPS) synchronized sampling.Specifically, synchronous trigger mode
Block is operable under motor synchronizing or outside synchronous two kinds of synchronous modes；When not accessing external clock, module works in motor synchronizing mould
Formula generates pps pulse per second signal, output to synchronization signal bus according to internal crystal oscillator；When external clock accesses, module works in
External synchronization mode follows external clock and exports synchronizing signal to synchronization signal bus.The bus group packet communication module setting
There are FPGA controller, the FPGA controller to be used for multiple input signal analysis and processing and organize packet transmission.The fpga chip
Signal is exported to data processing module using spi bus agreement, the data processing module uses spi bus agreement by signal
To FPGA controller, the FPGA controller sends a signal to terminal industrial computer by Ethernet for output.
Preferably, the PT is accurate miniature PT.
Preferably, the A/D conversion modules use 24 Σ-Δ type analog-to-digital converter ADS1274 chip developments, should
Chip has 4 groups of analog input pins, its first three groups analog input pin is connected to front end conditioning module output end, is adopted
Sample rate is set as 10kHz, the three-phase voltage signal for acquiring an interval mutual inductor.Fpga chip, which is received and responded, to be come from
The pps pulse per second signal of synchronization signal bus, control ADS1274 chips follow synchronizing signal to start to sample, while will per second interior 1024
A sample point data is collected, accesses and sends, and follow-up data processing module is output data to using spi bus agreement；Always
Line group packet communication module is used to come from the data processing of multiple acquisition channels and group packet is sent, and includes mainly multichannel SPI
Communication to input information progress analyzing processing and is packaged, using wired ethernet interface pair as input, using FPGA controller
It is packaged that treated that information is sent.
Preferably, the fpga chip is EP4CE6E22C8, and performance meets the requirement of this system, mainly has A/D to control work(
It can be with data forwarding capability.The 50M clocks of FPGA are divided by phaselocked loop, 2.56MHz clock signals are generated, as A/
The sample rate of the sampling clock of D chips, control A/D chips is 10KHz, and FPGA receives external sync input signal, then generates
Lock-out pulse gives A/D chips, while controlling the work shape of A/D chips by changing the I/O mouth level being connected with A/D chips
State.The sampled data of A/D chips is sent to fpga chip by SPI interface, and fpga chip is modified it and eliminates direct current
Biasing, then be sent to by SPI interface.
Preferably, the data processing module uses high-speed digital video camera chip, by Resources on Chip simplify
Hardware device, calculates by outstanding data and processing capacity, realization high speed, high-precision data calculate；It is used based on three
The FFT Algorithm with High Accuracy of interpolation n uttall windows calculates the fundamental wave of three-phase signal, harmonic frequency, amplitude, phase, and seeks zero sequence
Voltage unbalance factor and negative sequence voltage degree of unbalancedness；Finally these result of calculations are packaged, are sent out by serial ports RS232
It send to consecutive Bus lines group packet communication module.Specifically, technology uses the TMS320C6748 high-performance of TI companies.This kind processing speed
Degree is fast, and operational precision supports SPI interface and UART interface up to 32.The data that FPGA is sent are received by SPI interface.Due to
The data that FPGA is sent are 82 system numbers, need that 48 integers are first converted into 1 32 floating numbers, then logarithm
According to progress spectrum analysis.Frequency analysis is carried out to the digital signal of reception using Fourier's fast transform algorithm FFT, due to FFT
This classical way can make signal generate spectral leakage and fence effect, seriously affect the accuracy of detection of harmonic parameters, therefore
It needs to apply high-performance window and interpolation algorithm on classical FFT.This final example selects the preferable Nuttall window functions of effect,
In upper progress FFT windowed interpolations.
Bus group packet communication module receives the data information of multiple signal gathering units output in each interval, and to its into
The recombination decoded with data of going is sent, and the equipment for the needs such as data acquisition while detection process multiline message provides each interval
Output sampled value.This is based partially on FPGA and carries out exploitation realization, can synchronize parsing multiplexed signal sampling cell data agreement, letter
Number compatible RS232 agreements of output and network interface agreement.
With reference to Fig. 3, since input signal has certain common mode interference, system to use differential signal input mode.Using electricity
Resistance bleeder circuit divides measured signal, then using two-stage differential circuit come conditioned signal.The first order is put using operation
Big device OPA227 constitutes difference channel, increases input impedance, reduces loss of signal；The second level uses differential amplifier THS4521
Difference channel is constituted, the common mode interference of input signal is reduced.The stability of reference voltage VREF is to the normal of analog-to-digital conversion module
It runs most important.Reference voltage source ADR421 is selected to be used as the source of referring to, the voltage source that there is lower voltage to make an uproar in this example
Sound can meet the requirement of analog-to-digital conversion module.
With reference to Fig. 4, the high frequency time signal acquisition arithmetic element is set in a patch panel, is set in the patch panel
It is equipped with to the wire area 1 of installation bus group packet communication module and synchronous trigger module, multiple distributed data acquisition processing
III plug of card is installed on the surface of the patch panel, is provided with and is separately connected on the distributed data acquisition processing card III
The input terminal 6 of CVT three-phase output signals is additionally provided in the patch panel to receive the optical port 2 of pulse per second (PPS), connection electricity
Plant-grid connection mouth 4, discharge cock 5 and the Ethernet output network interface 3 in source.In use, 220V communication power supplies and plant-grid connection
Mouth 4 is connected to, device for opening discharge cock 5, it would be desirable to which multigroup CVT secondary sides three-phase signal of monitoring is connected to input terminal 6, uses
Ethernet output network interface 3 is connected to terminal industrial computer both by ethernet netting twine can start to monitor.If optical port 2 does not connect input
Motor synchronizing pattern is worked in, system automatic work triggers pattern in external sync if 2 external pulse per second (PPS) PPS of optical port.
With reference to Fig. 5, it is preferred that the analysis software is write using LabView, and program uses the multilayer producer/consumer
Structure, including event generate part, data receiver part, data analysis component, database storage and reproduction part.Wherein event
It generates part to respond the instruction of program front panel human-computer interaction interface by event structure, and is recycled to other three
Send out corresponding control instruction；Data receiver part has used the dynamic link library that the function based on WinPcap function libraries is write, real
Now the dynamic data of computer network interface card is monitored, and parses valid data；Monitoring number of the data analysis component to collection in worksite
According to real-time analyzing processing is carried out, the actual motion state of live voltage transformer is obtained, in real time by analysis result with chart and wave
The mode of shape figure is intuitively shown on industrial computer screen, and exception is sent out if analysis show that mutual inductor operating status is abnormal
Warning, while the possible cause of unusual condition is analyzed, remind live operator on duty to safeguard and handle in time；Database stores up
It deposits and uses SQL application programming interfaces with reproduction part, data are stored into SQL database immediately, are stored in the ROM of computer
In, data will not be lost encountering computer circuit breaking failure, while this module provides data queries to reappear part, it can be with
Related data is called out using SQL query statement from database to be checked and handled.Four each self-operatings of cardiopulmonary bypass in beating heart, mutually
It does not depend on, the communication data only in core buffer, ensured the complete of data link and stablizes.
With reference to Fig. 6, the present invention also provides a kind of monitoring methods applied in above-mentioned analysis software, to monitor on-line for a long time
CVT secondary voltages output valve simultaneously carries out the least-squares parameter estimation with forgetting factor to be diagnosed to be CVT failures to it.It considers
CVT secondary voltages output valve can not only change because CVT self capacities puncture, it is also possible to be changed by monitoring point system voltage
Caused variation, so needing CVT secondary sides voltage change caused by removal system voltage in fault diagnosis.Usual system electricity
Pressure unusual fluctuations have following characteristics：A. quickly, generic failure can be by system protection in hundreds of milliseconds to the several seconds for voltage change
Action isolation；B. voltage change Amplitude Ration is larger, and most of system failure results in voltage and changes in decline, and CVT is electric
Holding failure can then cause secondary voltage to rise.In consideration of it, this method can exclude the caused change of monitoring point system voltage variation
Change, prevents system voltage fluctuation from causing to judge CVT failures by accident, and reduce data calculation amount and storage capacity.Specific steps are such as
Under：
Step 1：Establish the recursion of single distributed data acquisition processing III collected CVT secondary sides A, B, C three-phase signal of card
Least square model, setting estimation parameter,
For being individually spaced CVT, the recursive least-squares model of the CVT secondary sides signal is：
,
Wherein,、、A, B, C three-phase secondary voltage of respectively CVT,For ginseng to be estimated
Number.
Step 2：Initialization.To observation sequence length N and forgetting factorAssignment,Between 0 and 1.
Step 3：To parameter to be estimatedWithAssign initial value.Initial time value,；It is real-time to obtain N groups
The CVT output voltages of acquisition.
Step 4：One group of new CVT output three-phase voltage acquired in real time is obtained, voltage observing matrix is generated；WhereinIt is the output of CVT three-phasesIn the observation at current time,It is the output of CVT three-phasesObservation before n-hour.
Step 5：Calculate current time gain matrixAnd observing matrixCovariance matrix：
。
Step 6：The estimation parameter that update CVT secondary side A phases export。
Step 7：Calculate current time evaluation function, and judge it whether close to 0；
If its evaluation functionLess than given threshold close to 0, then it is assumed that assessment parameter is effective, and sequence executes step 8；It is no
Then turn to step 4.
Step 8：The parameter estimated, as measuringEstimated value, calculate the estimation
It is worth three-phase outputIt should if the difference is more than preset threshold value with the difference of the reference voltage of artificial settings
Phase CVT capacitances have breakdown possibility, send out fault alarm.
The above concrete structure and dimension data are to be illustrated to presently preferred embodiments of the present invention, but the present invention creates
It makes and is not limited to the embodiment, those skilled in the art can also make kind under the premise of without prejudice to spirit of that invention
The equivalent variations or replacement, these equivalent deformations or replacement of kind are all contained in the application claim limited range.
Claims (8)
1. a kind of CVT on-line monitoring systems based on distributed data acquisition processing, it is characterised in that：
Include standard signal converter unit successively（Ⅰ）, high frequency time data acquisition process unit（Ⅱ）With terminal industrial computer, institute
State the analysis software being equipped on terminal industrial computer for carrying out CVT operating statuses assessment and fault diagnosis；
Standard signal converter unit（Ⅰ）, including the output end of multiple PT, multiple PT respectively with multiple CVT is correspondingly connected with；
High frequency time data acquisition process unit（Ⅱ）, including multiple distributed numbers for being correspondingly connected with respectively with the output end of multiple PT
According to acquisition and processing card（Ⅲ）, each distributed data acquisition processing card（Ⅲ）Three-phase voltage signal for acquiring a CVT, institute
State distributed data acquisition processing card（Ⅲ）Including the Signal-regulated kinase, A/D conversion modules and data processing being sequentially connected electrically
Module；The high frequency time data acquisition process unit（Ⅱ）Further include synchronous trigger module and bus group packet communication module, it is described
Synchronous trigger module is used to send synchronizing signal, to the A/D conversion modules to ensure multiple distributed data acquisition processing cards
（Ⅲ）Synchronized sampling, the bus group packet communication module from the processing of each distributed data acquisition for will block（Ⅲ）It receives
Signal group packet is sent；
Terminal computer is electrically connected with the bus group packet communication module, to receive, analyze the signal received and show CTV
Operating status result.
2. the CVT on-line monitoring systems according to claim 1 based on distributed data acquisition processing, it is characterised in that：
The distributed data acquisition processing card（Ⅲ）Based on DSP and FPGA co-developments, the A/D conversion modules are opened based on FPGA
Hair, the data processing module are developed based on DSP.
3. the CVT on-line monitoring systems according to claim 2 based on distributed data acquisition processing, it is characterised in that：
The high frequency time data acquisition process unit（Ⅱ）Further include fpga chip, the synchronous trigger module sends pulse per second (PPS) to synchronization
Signal bus, the fpga chip receive and respond the pulse per second (PPS) and control different distributions formula data acquisition process card（Ⅲ）
A/D conversion modules follow pulse per second (PPS) synchronized sampling.
4. the CVT on-line monitoring systems according to claim 3 based on distributed data acquisition processing, it is characterised in that：
The bus group packet communication module is provided with FPGA controller, and the FPGA controller is used for multiple input signal analysis and processing
And it organizes packet and sends.
5. the CVT on-line monitoring systems according to claim 4 based on distributed data acquisition processing, it is characterised in that：
The fpga chip is exported signal to data processing module using spi bus agreement, and the data processing module is total using SPI
Wire protocol exports signal to FPGA controller, and the FPGA controller sends a signal to terminal industry by Ethernet and calculates
Machine.
6. special according to the CVT on-line monitoring systems that claim 1-5 any one of them is handled based on distributed data acquisition
Sign is：The high frequency time signal acquisition arithmetic element is set in a patch panel, be provided in the patch panel to
The wire area of installation bus group packet communication module and synchronous trigger module（1）, multiple distributed data acquisition processing cards（Ⅲ）
Plug is installed on the surface of the patch panel, the distributed data acquisition processing card（Ⅲ）On be provided with and be separately connected CVT
The input terminal of three-phase output signal（6）, it is additionally provided with to receive the optical port of pulse per second (PPS) in the patch panel（2）, connection
The plant-grid connection mouth of power supply（4）, discharge cock（5）With Ethernet output network interface（3）.
7. special according to the CVT on-line monitoring systems that claim 1-5 any one of them is handled based on distributed data acquisition
Sign is：The analysis software includes that event generates part, data receiver part, data analysis component, database storage part
Reappear part with data；The event generates part and is responded to the instruction of human-computer interaction interface by event structure, and
Corresponding control instruction is sent out to other four parts；The data receiver part sticks into Mobile state data decryptor to computer network,
And it parses valid data and is sent to data analysis component;The data analysis component carries out the monitoring data of collection in worksite
Real-time analyzing processing is simultaneously shown, while transmitting data to database storage part；Data are by database storage part
When be stored into database, be stored in the ROM of computer；Data reproduction part is for inquiring the original number in database
According to.
8. the monitoring method in a kind of analysis software applied to CVT on-line monitoring systems as claimed in claim 7, feature
It is to use the Least Square Recurrence Parameter Estimation Method with forgetting factor, specifically includes following steps：
Step 1：Establish single distributed data acquisition processing card（Ⅲ）Collected CVT secondary sides A, B, C three-phase signal is passed
Push away least square model, setting estimation parameter,
For being individually spaced CVT, the recursive least-squares model of the CVT secondary sides signal is：
,
Wherein,、、A, B, C three-phase secondary voltage of respectively CVT,For parameter to be estimated；
Step 2：Observation sequence length N and forgetting factor are given in initializationAssignment,Between 0 and 1；
Step 3：To parameter to be estimatedWithInitial value is assigned,
Initial time value,；Obtain the CVT output voltages that N groups acquire in real time；
Step 4：One group of new CVT output three-phase voltage acquired in real time is obtained, voltage observing matrix is generated；WhereinIt is observation of the CVT three-phases output at current time,It is CVT tri-
Mutually exportObservation before n-hour；
Step 5：Calculate current time gain matrixAnd observing matrixCovariance matrix：
；
Step 6：The estimation parameter that update CVT secondary side A phases export；
Step 7：Calculate current time evaluation function, and judge it whether close to 0；
If its evaluation functionLess than given threshold close to 0, then it is assumed that assessment parameter is effective, and sequence executes step 8；Otherwise
Turn to step 4；
Step 8：The parameter estimated, as measuringEstimated value, calculate the estimated value three-phase
OutputWith the difference of the reference voltage of artificial settings, if the difference is more than preset threshold value, phase CVT electricity
Have breakdown possibility, sends out fault alarm.
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| CN110361686A (en) * | 2019-08-28 | 2019-10-22 | 华北电力大学（保定） | Capacitance type potential transformer fault detection method based on multi-parameter |
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| CN110689252A (en) * | 2019-09-20 | 2020-01-14 | 云南电网有限责任公司电力科学研究院 | Capacitive voltage transformer metering error situation sensing system |
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