CN109283385A - A method and system for online processing of arrester monitoring data - Google Patents
A method and system for online processing of arrester monitoring data Download PDFInfo
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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
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
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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
- G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
- G01R27/2694—Measuring dielectric loss, e.g. loss angle, loss factor or power factor
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Abstract
本发明涉及一种避雷器监测数据在线处理方法及系统，通过对电流采集单元和电压采集单元采集到的信号进行全周波傅里叶变换求出初相角，对初相角根据工频的变化进行修正，然后利用最小二乘法拟合直线，求得各相电流信号和各相关母线电压信号的最终初相角和频率，消除了电流与电压的相位夹角发生的周期性变化，解决了现有避雷器在线监测数据处理方法存在的干扰性差，结果不准确的问题。
The invention relates to an on-line processing method and system for monitoring data of an arrester. The initial phase angle is obtained by performing full-cycle Fourier transform on the signals collected by the current acquisition unit and the voltage acquisition unit, and the initial phase angle is calculated according to the change of the power frequency. Correction, and then use the least squares method to fit a straight line to obtain the final initial phase angle and frequency of each phase current signal and each related busbar voltage signal, eliminating the periodic change of the phase angle between the current and the voltage, and solving the existing problems. There are problems of poor interference and inaccurate results in the data processing method of arrester online monitoring.
Description
Technical field
The invention belongs to arrester on-line monitoring technique fields, and in particular to a kind of arrester monitoring data online processing side
Method and system.
Background technique
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.In recent years, the AC gapless Oxide Arrester in substation operation is due to valve block
Aging so that electric property is degenerated so as to cause explosion accident happen occasionally, bring massive losses to national economy, give power grid
Safe operation brings serious threat.Arrester is implemented to monitor on-line, can effectively monitor arrester internal flaw in time,
It finds and debugs early, avoid that Explosion of on Arrester occurs, ensure safe operation of power system.
In order to monitor AC gapless Oxide Arrester valve block nonlinear resistance property, the best way be monitoring
Current in resistance property.Accurate current in resistance property is obtained, the total current and busbar voltage of synchronous acquisition arrester are needed.It is existing usually to adopt
It is calculated with the mode of Fourier transformation, least square method fitting, frequency, phase angle.But due to arrester electric current and reality
It bears electric voltage frequency to be different, causes the continuous wave of the variation of the phase angle generating period of electric current and voltage and frequency
It is dynamic, cause calculated result not accurate enough.
Summary of the invention
The purpose of the present invention is to provide a kind of arrester monitoring data on-line processing method and systems, to solve existing keep away
The problem of thunder device monitoring data on-line processing method calculated result inaccuracy.
In order to solve the above technical problems, the technical solution of the present invention is as follows:
The present invention provides a kind of arrester monitoring data on-line processing methods, comprising the following steps:
1) each phase current signal of synchronous acquisition arrester and each associated bus voltage signal, to collected at least two weeks
The signal of wave carries out whole wave Fourier's operation every N number of sampled point；
2) amplitude and initial phase angle of each phase current and each associated bus voltage are calculated according to step 1) operation result；
3) initial phase angle of each phase current signal and each associated bus voltage signal obtained to step 2) operation is modified,
The initial phase angle α [k+1] being calculated with latter k+1 times subtracts k initial phase angle α [k],
If α [k+1]-α [k] > β, α [k+1]=- 360 ° of α [k+1],
α if [k+1]-α [k] <-β, α [k+1]=+ 360 ° of α [k+1]；
Wherein k=1,2,3..., β are related with the highest frequency that power frequency and power frequency change；
4) coefficient a, b are acquired using least square method fitting a straight line y=ax+b for the data of each group k and α [k], b is
The final initial phase angle of each phase current and each associated bus voltage, signal frequency are acquired by a.
The present invention also provides a kind of arrester monitoring data Online Processing Systems, including current acquisition unit, voltage to adopt
Collection unit, processor and memory, the processor receive the signal of the current acquisition unit and voltage acquisition unit；It is described
Processor, which executes, stores the instruction to realize following method and step in memory:
1) each phase current signal of synchronous acquisition arrester and each associated bus voltage signal, to collected at least two weeks
The signal of wave carries out whole wave Fourier's operation every N number of sampled point；
2) amplitude and initial phase angle of each phase current and each associated bus voltage are calculated according to step 1) operation result；
3) initial phase angle of each phase current signal and each associated bus voltage signal obtained to step 2) operation is modified,
The initial phase angle α [k+1] being calculated with latter k+1 times subtracts k initial phase angle α [k],
If α [k+1]-α [k] > β, α [k+1]=- 360 ° of α [k+1],
α if [k+1]-α [k] <-β, α [k+1]=+ 360 ° of α [k+1]；
Wherein k=1,2,3..., β are related with the highest frequency that power frequency and power frequency change；
4) coefficient a, b are acquired using least square method fitting a straight line y=ax+b for the data of each group k and α [k], b is
The final initial phase angle of each phase current and each associated bus voltage, signal frequency are acquired by a.
Beneficial effects of the present invention:
It is found out by carrying out whole wave Fourier transformation to current acquisition unit and the collected signal of voltage acquisition unit
Initial phase angle is modified initial phase angle according to the variation of power frequency, then utilizes least square method fitting a straight line, acquires each phase current
The final initial phase angle and frequency of signal and each associated bus voltage signal eliminate the week of the phase angle generation of electric current and voltage
The variation of phase property solves the problems, such as existing arrester online monitoring data processing method calculated result inaccuracy.
Further, further include step 5), judge that Current Voltage effectively runs definite value, according to pass through frequency, phase relation
After the stability of calculation medium loss value, according to each phase phase difference for calculating arrester electric current and the busbar voltage, then basis
Phase difference calculating current in resistance property, the size of the current in resistance property are equal to total current multiplied by the cosine of Current Voltage phase difference.
Further, system further includes the communication integrated management unit for signal synchronous collection.
Detailed description of the invention
Fig. 1 is two cycle schematic diagrames of the method for the present invention signal；
Fig. 2 is two cycle initial phase angle schematic diagrames of the method for the present invention；
Fig. 3 is schematic diagram after the method for the present invention initial phase angle least square method fitting a straight line；
Fig. 4 is of the invention based on serial bus arrester on-Line Monitor Device system schematic.
Specific embodiment
To keep the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, to the present invention
It is described in further detail.
The specific implementation step of method provided by the invention are as follows:
As shown in Figure 1, current acquisition unit and the synchronous acquisition 2 of voltage acquisition unit one time cycle totally 512 sampled points,
All-wave Fourier's operation is carried out every 16 sampled points to two cycles, 16 calculating knots can be obtained in 512 sampled points altogether
Fruit.The amplitude of whole wave Fourier transformation, calculating current and voltage, and then the initial phase angle of calculating current and voltage, obtain electric current
Initial phase angle as shown in Fig. 2, altogether can be obtained 16 calculated results.
The initial phase angle of each phase current signal and each associated bus voltage signal that obtain to operation is modified, with rear k+1
The secondary initial phase angle α [k+1] being calculated subtracts k initial phase angle α [k],
If α [k+1]-α [k] > β, α [k+1]=- 360 ° of α [k+1],
α if [k+1]-α [k] <-β, α [k+1]=+ 360 ° of α [k+1]；
Wherein k=1,2,3..., β are related with the highest frequency of power frequency and power frequency measure of the change；Power frequency is 50Hz, i.e., one
Period is 0.02s, in one cycle 360 ° of angle change, and when frequency is 65Hz, a cycle time is 0.01538s pairs
Answer 360 ° of angle change, in 65Hz the corresponding angle of 0.02/16s be β be equal to 0.02s/16 and 360 products again divided by
0.01538 obtains 29.25 °, is approximately 30 °.
As shown in figure 3, the data using least square method about each group k and α [k], fitting a straight line y=ax+b, are acquired each
The final initial phase angle b and signal frequency of phase current and each associated bus voltage,
Wherein signal frequency acquires the ÷ of f=a × 50 22.5 by straight slope a, and signal frequency includes electric voltage frequency and electric current
Frequency.
Communication synthesis administrative unit poll acquisition unit receives message, and processor parses message to obtain respective counts
According to, by the practical 1 interval ABC three-phase current acquisition unit of arrester respectively with the consistent item of voltage cell sample-synchronous serial number
Under part, judge that Current Voltage effectively runs definite value, after through frequency, the stability of phase relation calculation medium loss value,
According to each phase phase difference for calculating arrester electric current and the busbar voltage, current in resistance property size is equal to total current multiplied by Current Voltage
Thus the cosine of phase difference judges the degradation of arrester.
The present invention also provides a kind of arrester monitoring data Online Processing System, system includes current acquisition unit, electricity
Press acquisition unit, processor, memory and communication management unit.As shown in figure 4, the communication management unit of system passes through RS485
Bus issues synchronous acquisition order to voltage acquisition unit and each arrester current acquisition unit, and acquisition unit FPGA receives order
Trigger AD7606 sampling.Then serial number byte, the report sent on acquisition unit are synchronized to addition in above-mentioned acquisition unit polling message
Literary also band synchronizes serial number byte, and it is that synchronous serial number is used to distinguish for which secondary synchronous acquisition order issued.
Communication synthesis administrative unit poll acquisition unit receives message, and processor parses message to obtain respective counts
According to, by the practical 1 interval ABC three-phase current acquisition unit of arrester respectively with the consistent item of voltage cell sample-synchronous serial number
Under part, according to voltage ABC three-phase initial phase angle, the initial phase angle of current three-phase, calculate with the phase difference of corresponding busbar voltage, thus most
Current in resistance property is calculated eventually.
Integrated management unit is communicated by MMS and station end monitor supervision platform communication, administrative staff can real time inspection arrester prison
The parameter state of measured data Online Processing System.
Claims (5)
1. a kind of arrester monitoring data on-line processing method, which comprises the following steps:
1) each phase current signal of synchronous acquisition arrester and each associated bus voltage signal, to collected at least two cycle
Signal carries out whole wave Fourier's operation every N number of sampled point；
2) amplitude and initial phase angle of each phase current and each associated bus voltage are calculated according to step 1) operation result；
3) initial phase angle of each phase current signal and each associated bus voltage signal obtained to step 2) operation is modified, after
K+1 times the initial phase angle α [k+1] being calculated subtracts k initial phase angle α [k],
If α [k+1]-α [k] > β, α [k+1]=- 360 ° of α [k+1],
α if [k+1]-α [k] <-β, α [k+1]=+ 360 ° of α [k+1]；
Wherein k=1,2,3..., β are related with the highest frequency that power frequency and power frequency change；
4) coefficient a, b are acquired using least square method fitting a straight line y=ax+b for the data of each group k and α [k], b is each phase
The final initial phase angle of electric current and each associated bus voltage, signal frequency are acquired by a.
2. arrester monitoring data on-line processing method according to claim 1, which is characterized in that it further include step 5),
Judge that Current Voltage effectively runs definite value, after through frequency, the stability of phase relation calculation medium loss value, according to meter
Each phase phase difference for calculating arrester electric current and the busbar voltage, then according to phase difference calculating current in resistance property, the current in resistance property
Size be equal to total current multiplied by Current Voltage phase difference cosine.
3. a kind of arrester monitoring data Online Processing System, including current acquisition unit, voltage acquisition unit, processor and deposit
Reservoir, the processor receive the signal of the current acquisition unit and voltage acquisition unit；It is characterized in that, the processor
It executes and stores the instruction to realize following method and step in memory:
1) each phase current signal of synchronous acquisition arrester and each associated bus voltage signal, to collected at least two cycle
Signal carries out whole wave Fourier's operation every N number of sampled point；
2) amplitude and initial phase angle of each phase current and each associated bus voltage are calculated according to step 1) operation result；
3) initial phase angle of each phase current signal and each associated bus voltage signal obtained to step 2) operation is modified, after
K+1 times the initial phase angle α [k+1] being calculated subtracts k initial phase angle α [k],
If α [k+1]-α [k] > β, α [k+1]=- 360 ° of α [k+1],
α if [k+1]-α [k] <-β, α [k+1]=+ 360 ° of α [k+1]；
Wherein k=1,2,3..., β are related with the highest frequency that power frequency and power frequency change；
4) coefficient a, b are acquired using least square method fitting a straight line y=ax+b for the data of each group k and α [k], b is each phase
The final initial phase angle of electric current and each associated bus voltage, signal frequency are acquired by a.
4. arrester monitoring data Online Processing System according to claim 3, which is characterized in that it further include step 5),
Judge that Current Voltage effectively runs definite value, after through frequency, the stability of phase relation calculation medium loss value, according to meter
Each phase phase difference for calculating arrester electric current and the busbar voltage, then according to phase difference calculating current in resistance property, the current in resistance property
Size be equal to total current multiplied by Current Voltage phase difference cosine.
5. arrester monitoring data Online Processing System according to claim 3 or 4, which is characterized in that further include being used for
The communication integrated management unit of signal synchronous collection.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244144A (en) * | 2019-05-28 | 2019-09-17 | 许昌许继软件技术有限公司 | A lightning arrester state monitoring method and AC data acquisition method |
| CN111323665A (en) * | 2020-03-18 | 2020-06-23 | 合肥瀚度电力科技有限公司 | Arrester monitoring device, method and system based on GPS timing ratio correction |
| CN115097226A (en) * | 2022-07-13 | 2022-09-23 | 中冶京诚工程技术有限公司 | Voltage phase sequence identification method and device of high-power rectifier |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110244144A (en) * | 2019-05-28 | 2019-09-17 | 许昌许继软件技术有限公司 | A lightning arrester state monitoring method and AC data acquisition method |
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| CN111323665A (en) * | 2020-03-18 | 2020-06-23 | 合肥瀚度电力科技有限公司 | Arrester monitoring device, method and system based on GPS timing ratio correction |
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