CN109239447A - A kind of power distribution network transient overvoltage monitoring system - Google Patents
A kind of power distribution network transient overvoltage monitoring system Download PDFInfo
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- CN109239447A CN109239447A CN201810956588.6A CN201810956588A CN109239447A CN 109239447 A CN109239447 A CN 109239447A CN 201810956588 A CN201810956588 A CN 201810956588A CN 109239447 A CN109239447 A CN 109239447A
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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
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16528—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values using digital techniques or performing arithmetic operations
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Abstract
The present invention relates to a kind of power distribution network transient overvoltages to monitor system, including middle voltage capacitance divider, filtering and sampling apparatus and embedded detection device, wherein, embedded detection device includes monitoring chip, memory modules, memory module, communication module, clock module and power module；Medium pressure capacitive divider obtains voltage signal from power distribution network, the voltage signal is converted into digital signal after voltage signal is filtered and is sampled by filtering and sampling apparatus and enters memory modules, monitoring chip is analyzed the digital signal in memory modules and is saved to memory module, and the communication module, clock module and power module are all connected with monitoring chip.Compared with prior art, the present invention is for monitoring transient overvoltage phenomenon, after power equipment such as is struck by lightning at the transient overvoltages damage, is able to record relevant Wave data as the judgment basis damaged to it, to give other systems offer foundation.
Description
Technical field
The present invention relates to a kind of voltage monitoring equipment of electric system, supervise more particularly, to a kind of power distribution network transient overvoltage
Examining system.
Background technique
Overvoltage is the main external cause for leading to insulation of electrical installation damage and equipment fault, especially lightning surge, by
It is much higher than the rating operating voltage of power grid in its amplitude, will lead to the apparatus insulated level such as voltage transformer, arrester, transformer
It reduces, equipment damage, or even explosion, it is especially prominent to the harm of the power equipment with winding such as transformer, reactor minor insulation
Out, larger economic loss and social influence are caused.Therefore, monitoring transmission line of electricity over-voltage condition is for obtaining true power transmission line
It passes by voltage data, analysis Overvoltage, improve line insulation cooperation, the Lighting Protection Measures for improving overhead transmission line and guarantor
Barrier safe operation of power system is of great significance.
Voltage transformer is generally used to the monitoring of power distribution network at present, frequency response bandwidth is difficult to meet true transmission lightning wave
The requirement of frequency spectrum, so its monitoring effect is generally bad, meanwhile, it not can solve mass data storage and transmission problem, do not have
With reliable and perfect communication function, data acquisition rate and frequency response etc. can not meet the requirement for having technology.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of power distribution network transient state mistakes
Voltage monitoring system.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of power distribution network transient overvoltage monitors system, including middle voltage capacitance divider, filtering and sampling apparatus and embedding
Enter formula detection device, wherein embedded detection device includes monitoring chip, memory modules, memory module, communication module, clock
Module and power module；Medium pressure capacitive divider obtains voltage signal from power distribution network, the voltage signal by filtering and
Sampling apparatus is converted into digital signal and enters memory modules after voltage signal is filtered and is sampled, monitor chip to memory mould
Digital signal in block is analyzed and is saved to memory module, and the communication module, clock module and power module are all connected with
Monitor chip.
Further, the middle voltage capacitance divider uses underdamping equivalent potential screen formula capacitive divider, high pressure
Arm uses polystyrene capacitor, and low-voltage arm is formed using multiple impulse capacitor coaxial parallel-connections, the damping of high-voltage arm terminal tandem
Resistance R1 needs series matching resistor R2 in output end；The height of middle voltage capacitance divider is 25cm, intrinsic standoff ratio k=300:1.
Further, the resistance R1 uses the noninductive resistance of 100 Ω.
Further, the filtering and sampling apparatus include sequentially connected high-pass filter and sample circuit, described
Voltage capacitance divider in high-pass filter connection, the sample circuit include level-one amplification sub-circuit and filtering chip, the filtering
Chip connection monitoring chip.
Further, the model ADC3221 of the filtering chip.
Further, the communication modes of the communication module are WIFI.
Further, the model CortexM7 of the monitoring chip；The memory modules use the DDR2 of 64mb；
The memory module uses SD card.
Further, monitoring chip carries out time-domain analysis to the digital signal in memory modules, finds such as in time domain temporary
State overvoltage phenomenon, then 5 cycles each to the front and back of maximum collection voltages carry out frequency-domain analysis, and by date by overvoltage data
It saves with after time name to memory module.
Compared with prior art, the invention has the following advantages that
1, the present invention is for monitoring transient overvoltage phenomenon, after power equipment such as is struck by lightning at the transient overvoltages damage,
Relevant Wave data is able to record as the judgment basis damaged to it, to provide foundation to other systems.Therefore, this hair
Bright application can effectively reduce transient overvoltage harm caused by electric system and equipment, reduce the insulation damages of equipment, mention
High power system power supply quality and security reliability.
2, invention samples over-voltage signal by middle voltage capacitance divider, and carries out ultrahigh speed using embedded detection device
Sampling, can analyze frequency in 1Mhz waveform below, be truly realized analysis lightning wave.
3, real-time perfoming data comparison of the present invention, so that it is determined that relevant transient voltage waveform and phenomenon and record event hair
The raw time and waveform correlation data uses feasible interference protection measure in terms of hardware and software two, improves the stabilization of device
Property；The waveform event data storage of formation facilitates subsequent communications or is copied directly on computer inside the SD card of device
It is analyzed.
4, voltage capacitance divider uses underdamping equivalent potential screen formula capacitive divider in the present invention, it has good height
Low frequency response is able to satisfy inside and outside over-voltage monitoring needs, and it is special to the response of lightning surge to overcome common voltage transformer
Property it is inadequate, cannot function as overvoltage obtain equipment the shortcomings that.
5, the present invention uses the model ADC3221 of filtering chip, monitors the model CortexM7 of chip, memory modules
Using the DDR2 of 64mb, low in energy consumption, the small feature of purchase cost is all had, is easy to large-scale production application of the invention, is had
There is good commerciality.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the structural schematic diagram of embedded detection device；
Fig. 3 is the structural schematic diagram of middle voltage capacitance divider；
Fig. 4 is the structural schematic diagram of sample circuit；
Appended drawing reference: 1, middle voltage capacitance divider, 2, filtering and sampling apparatus, 21, filtering chip, 3, embedded detection dress
It sets, 31, monitoring chip, 32, memory modules, 33, memory module, 34, communication module, 35, clock module, 36, power module.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to
Following embodiments.
As depicted in figs. 1 and 2, a kind of power distribution network transient overvoltage monitoring system, hardware components are present embodiments provided
Including middle voltage capacitance divider 1, filtering and sampling apparatus 2 and embedded detection device 3, wherein embedded detection device 3 is wrapped
Include monitoring chip 31, memory modules 32, memory module 33, communication module 34, clock module 35 and power module 36.Monitor chip
31 model CortexM7；Memory modules 32 use the DDR2 of 64mb；Memory module 33 uses SD card；Communication module 34 leads to
News mode is WIFI.
Middle voltage capacitance divider 1 obtains voltage signal from power distribution network, and the voltage signal is right by filtering and sampling apparatus 2
Voltage signal is filtered and is converted into after sampling digital signal and enters memory modules 32, monitors chip 31 in memory modules 32
Digital signal analyzed and saved to memory module 33, the communication module 34, clock module 35 and power module 36 are equal
Connection monitoring chip 31.
As shown in figure 3, middle voltage capacitance divider 1 uses underdamping equivalent potential screen formula capacitive divider, it has good
Low-and high-frequency response, be able to satisfy inside and outside over-voltage monitoring needs.Its high-voltage arm uses polystyrene capacitor C1, and low-voltage arm uses
Multiple impulse capacitor C2 coaxial parallel-connections form, and to reduce oscillation, high-voltage arm terminal tandem damping resistance R1 needs to go here and there in output end
Join build-out resistor R2, resistance R2 is 50 Ω.The divider can bear the overvoltage of 50kV, depress external insulation by normal atmosphere
Creep distance 3kV/cm is calculated, and divider height is not less than 17cm, and the present apparatus takes 25cm.Voltage after the middle partial pressure of voltage capacitance divider 1
Value cannot be too big or too small, otherwise will be more difficult for the transmission of signal and processing, takes intrinsic standoff ratio k=300:1 herein.
The oscillation of wave head is FAQs when divider measures lightning wave, to reduce oscillation, it is desirable that divider has smaller
Inductance.But divider inductance is typically always present, therefore need to consider that suitable damping resistance is added to inhibit oscillation.The present embodiment
In, the voltage rising time in low-voltage arm is controlled by high-voltage arm time constant C1R1.To reduce error, it is desirable that this time constant is not
Greater than the 1/10 of the tested waveform wave head time, if you need to measure the standard lightning wave of 1.2 μ s/50 μ s, then C1R1≤120ns is required.
Be R1 to eliminate the critical damping resistance of low-frequency oscillation, to obtain lesser response time, R1 can obtain it is smaller, according to reality
It surveys, divider inductance is about 1.92 μ H, therefore calculating the damping resistance R1 that should be concatenated in high-voltage arm is 120 Ω or so, this
Embodiment takes 100 Ω, then C1R1=20ns < 120ns, meets lightning wave measurement request.In addition, damping resistance R1 should select it is larger
The noninductive resistance of power, maximum power 2.5W.
As shown in figure 4, filtering and sampling apparatus 2 include sequentially connected high-pass filter and sample circuit, the high pass
Voltage capacitance divider 1 in filter connection filters out fundamental voltage and low-order harmonic voltage when acquisition.The sample circuit
Amplify sub-circuit and filtering chip 3, the filtering chip 21 connection monitoring chip 31 including level-one.Because by voltage divider
Signal is fainter, therefore increases level-one amplifier on sample circuit, amplifies for the power to sampled signal, while right
The amplitude of sampled signal is compressed, and sampling AD requirement is met.The ADC3221 chip that AD uses ADI company is sampled, which is one
Money 16 high-speed sampling A/D chips, sampling rate maximum can arrive 10MSPS, not only meet work requirements, and the energy that works
Consume small, purchase cost is low.
The working principle of the present embodiment is the voltage capacitance divider 1 in utilization under the timing control of CortexM7 chip
Voltage signal is obtained, this voltage signal follows circuit by being input to AD sampling end, high-speed AD after high-pass filtering by relevant
After sampling, by the DDR2 RAM of DMA transfer to detection device, then CortexM7 chip to the data in DDR2 RAM into
Row time-domain analysis finds transient overvoltage phenomenon, then 5 cycles each to the front and back of maximum collection voltages such as in time domain
(200mS) carries out frequency-domain analysis, and saves related data and record event.
Application software of the invention is partly comprised in three line monitoring, data analysis and remote access and control parts.
On-line monitoring part realizes the extraction of overvoltage data, and the change of waveform parameter is monitored by certain criterion
Change, once have Overvoltage, just extract overvoltage data, by overvoltage data by date with the time name after save to
In SD card.
Data analysis component realizes the analysis of over-voltage waveform time-domain and frequency-domain, and wherein time-domain analysis includes over-voltage waveform
It reproduces and over-voltage waveform parameter calculates, frequency-domain analysis includes power spectrumanalysis, amplitude spectrum analysis, phase spectral analysis, Yi Jixie
Wave analysis.The part is completed by independent thread, due to the limitation of embedded system, before and after can only analyzing overvoltage
5 cycles, the result analyzed are also stored in SD card.
1) overvoltage data time-domain analysis: calculative over-voltage waveform parameter includes overvoltage wave in time-domain analysis
Shape starting point, over-voltage waveform peak point, overvoltage peak value, wave head time, wave head steepness etc..
2) it overvoltage data frequency-domain analysis: generally requires to transform to time-domain signal on frequency domain in measuring technology and be divided
Analysis, reflects from the angle of frequency domain and discloses the changing rule of signal, and the method for this frequency-domain analysis is also known as Spectral Analysis Method.It is right
The spectrum analysis of signal can obtain more useful information, such as acquire each frequency content and the frequency distribution in overvoltage signal
Range finds out the amplitude distribution and Energy distribution of each frequency content, to provide foundation to Over-voltage Analysis for us.Analysis
Mainly being carried out by fast Fourier variation, the reference frequency of Fourier's variation is synchronous with mains frequency, thus there is no
The case where aliasing is analyzed when high-frequency signal.
It remotely accesses with control section and includes:
1) ethernet control module, the connection that Ethernet is carried out after systems inspection to cable accesses are attempted, and RTOS is used
It is embedded in LWIP agreement in system, checks network connection and carries out the address the machine mac and ip configuration (be not configured and carry out DHCP trial),
Server is connected after configuration successful, then communication data uses ethernet communication after successful connection.
2) WIFI control module, the Wi-Fi module communicated using Local Area Networking, the module can self-built AP hot spot, support from
End equipment accesses and establishes data connection copy reading device data, parameter configuration etc..
To sum up, the present embodiment designs in terms of hardware, software two, develops a kind of power distribution network transient overvoltage monitoring system
System.The system can monitor the instantaneous overvoltage of 35kV substation 10kV three-phase bus.Pass through the use to the system, Ke Yiji
The accurate information of power distribution network over-voltage occurrence and development process is recorded, inhibits overvoltage method to provide practical foundation for further research,
Analysis result can also be used for the insulating Design etc. of electric system simultaneously, there is practical value.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be within the scope of protection determined by the claims.
Claims (8)
1. a kind of power distribution network transient overvoltage monitors system, which is characterized in that including middle voltage capacitance divider, filtering and sampling cartridge
It sets and embedded detection device, wherein embedded detection device includes monitoring chip, memory modules, memory module, communication mould
Block, clock module and power module；Medium pressure capacitive divider obtains voltage signal from power distribution network, which passes through
Filtering and sampling apparatus are converted into digital signal and enter memory modules after voltage signal is filtered and is sampled, monitor chip pair
Digital signal in memory modules is analyzed and is saved to memory module, the communication module, clock module and power module
It is all connected with monitoring chip.
2. power distribution network transient overvoltage according to claim 1 monitors system, which is characterized in that the middle voltage capacitance point
Depressor uses underdamping equivalent potential screen formula capacitive divider, and high-voltage arm uses polystyrene capacitor, and low-voltage arm is using more
A impulse capacitor coaxial parallel-connection forms, and high-voltage arm terminal tandem damping resistance R1 needs series matching resistor R2 in output end；In
The height of voltage capacitance divider is 25cm, intrinsic standoff ratio k=300:1.
3. power distribution network transient overvoltage according to claim 2 monitors system, which is characterized in that the resistance R1 is used
The noninductive resistance of 100 Ω.
4. power distribution network transient overvoltage according to claim 1 monitors system, which is characterized in that the filtering and sampling
Device includes sequentially connected high-pass filter and sample circuit, and voltage capacitance divider in the high-pass filter connection is described
Sample circuit includes level-one amplification sub-circuit and filtering chip, filtering chip connection monitoring chip.
5. power distribution network transient overvoltage according to claim 4 monitors system, which is characterized in that the filtering chip
Model ADC3221.
6. power distribution network transient overvoltage according to claim 1 monitors system, which is characterized in that the communication module
Communication modes are WIFI.
7. power distribution network transient overvoltage according to claim 1 monitors system, which is characterized in that the monitoring chip
Model CortexM7；The memory modules use the DDR2 of 64mb；The memory module uses SD card.
8. power distribution network transient overvoltage according to claim 1 monitors system, which is characterized in that monitoring chip is to memory mould
Digital signal in block carries out time-domain analysis, the discovery transient overvoltage phenomenon such as in time domain, then to maximum collection voltages before
Each 5 cycles carry out frequency-domain analysis afterwards, and overvoltage data are saved with after time name to memory module by date.
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| CN201810956588.6A CN109239447A (en) | 2018-08-21 | 2018-08-21 | A kind of power distribution network transient overvoltage monitoring system |
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| CN201810956588.6A CN109239447A (en) | 2018-08-21 | 2018-08-21 | A kind of power distribution network transient overvoltage monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109900952A (en) * | 2019-03-13 | 2019-06-18 | 清华四川能源互联网研究院 | A kind of transient signal rapidly extracting processing method |
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Effective date of registration: 20190410 Address after: Room 1301, Building 430-1, Xujiahui Road, Huangpu District, Shanghai 200025 Applicant after: Shanghai Hengnengtai Enterprise Management Co., Ltd. Applicant after: Shanghai Runpower Information Technology Co., Ltd. Address before: 200437 No. 171, Handan Road, Shanghai, Hongkou District Applicant before: Shanghai Sai Pu Le Power Technology Co. Ltd. Applicant before: Shanghai Runpower Information Technology Co., Ltd. |
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