CN113655330A - 10kV line state detection system based on line noise monitoring - Google Patents
10kV line state detection system based on line noise monitoring Download PDFInfo
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- CN113655330A CN113655330A CN202110009924.8A CN202110009924A CN113655330A CN 113655330 A CN113655330 A CN 113655330A CN 202110009924 A CN202110009924 A CN 202110009924A CN 113655330 A CN113655330 A CN 113655330A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/26—Measuring noise figure; Measuring signal-to-noise ratio
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
Abstract
The invention discloses a 10kV line state detection system based on line monitoring, which judges the line state by monitoring the change state of line current and voltage when a 10kV line fails, can display the fault position and the fault occurrence time in a mode of combining a master station with the network topology of a carrier within a few seconds after the fault occurs, helps maintenance personnel to quickly arrive at the site, eliminates the fault, recovers normal power supply, improves the power supply reliability, greatly reduces fault line inspection personnel and improves the working efficiency.
Description
Technical Field
The invention relates to the field of medium-voltage carriers, in particular to a 10kV line state detection system based on line noise monitoring.
Background
The 10kV distribution line is an important component of power facilities of power supply enterprises, is an important task for supplying power to customers, and has the characteristics of multiple points, wide area, long line length and the like due to long-term outdoor operation, so that the 10kV line in operation can frequently trip in accidents, thereby not only causing economic loss to the power supply enterprises, but also influencing industrial production and civil life power consumption. How to rapidly help line maintenance personnel to locate the place where the line fault occurs and monitor the running state of the line becomes a technical difficulty which needs to be solved urgently in the industry.
At present, the method of detecting current and voltage on a 10kV phase line is generally adopted in the industry, and the line state is judged by monitoring the change state of the current and voltage of the line when a 10kV line has a fault. The fault detection devices designed in the industry are all wireless uplink, battery power supply and mutual inductance energy obtaining modes, and the modes have information transmission, safety loopholes and limited service life of the battery (generally three years).
Disclosure of Invention
In view of the above-mentioned drawbacks and disadvantages of the prior art, an object of the present invention is to provide a 10kV line status detection system based on line noise monitoring. The system can realize remote communication transmission, and has no problems of information safety and mobile channel obstruction because a mobile network is not needed, and the service life is not limited by a battery.
In order to solve the above problems, the present invention provides a 10kV line state detection system based on line noise monitoring, which comprises a medium voltage carrier machine, a medium voltage carrier coupler, and a line state analysis unit, wherein:
the medium-voltage carrier machine is used for carrying out specific acquisition operation on time domain characteristics and frequency spectrum characteristics of line noise, analyzing and comparing results with normal values in a normal communication process, and screening out fault signals generated when a medium-voltage line fails through algorithm processing.
And the medium-voltage carrier coupler is used for coupling a fault signal of the medium-voltage line to the medium-voltage carrier machine.
And the line state monitoring system hung up and down from the master station can realize detection and monitoring of the medium-voltage line state according to preset carrier paths, domain value parameters and line parameters and obtain a line state conclusion.
The invention is further characterized in that:
the medium-voltage carrier machine comprises a filter circuit, an FPGA XC7Z020 data processing unit, a line state detection circuit, a carrier communication unit and a power supply unit.
The acquisition operation is to analyze and quantize information of amplitude gradual change based on time domain characteristic analysis by adopting 14-bit high-speed AD sampling, and extract the amplitude gradual change state: the attenuation state of the amplitude of the signal is calculated by quantizing the amplitude of the sinusoidal signal by utilizing a cross-correlation function, and the calculation process is as follows:
observed signal x (ti) s (ti) + g (ti), i 12N. Where s (ti) is the sinusoidal signal defined by equation (1), g (ti) is an additive white gaussian noise with zero mean and variance σ. The simulation parameters are as follows:
frequency f0 ═ 10HZ, initial phase
The amplitude a is 1.
The algorithm for screening the fault signals is that the frequency spectrum of the fault signals is extracted in combination with the extraction of amplitude gradient information, the frequency spectrum information of the fault signals is obtained by using discrete Fourier transform, and the calculation formula is as follows:
wherein, akRepresenting the real part of the first harmonic, bkAnd the imaginary part of the kth harmonic wave is represented, N represents the number of data points of the power frequency cycle wave, and k represents the harmonic frequency.
And the master network management station establishes a fault data system and performs analog screening on the fault signals.
The invention has the advantages that:
1. a power carrier network transmission system constructed by utilizing the existing 10kV power network can realize remote communication transmission.
2. The mobile network is not needed, so that the problems of information safety and mobile channel obstruction do not exist, and the service life problem is not limited by a battery.
3. After the well line break down, this equipment is through the collection analysis to the fault waveform, can effectual location to the fault interval that the line fault produced, the quick solution problem of assistance maintainer.
Drawings
Fig. 1 is a system block diagram of a 10kV line state detection system based on line noise monitoring according to the present invention.
Fig. 2 is a fault waveform generated by a coupler of a 10kV line state detection system based on line noise sensing according to the present invention.
Fig. 3 is a circuit diagram of the detection of the 10kV line state detection system based on line noise monitoring of the present invention.
Detailed Description
The present invention will be further described with reference to fig. 1 and the embodiments, so as to specifically describe the system scheme of the present invention. The following examples are only for illustrating the system scheme of the present invention more clearly, and should not be taken as limiting the scope of the present invention.
As shown in fig. 1, a 10kV line state detection system based on line noise monitoring of the present invention comprises the following parts:
the circuit comprises a medium-voltage carrier machine, a medium-voltage carrier coupler and a line state analysis unit, wherein the medium-voltage carrier machine comprises a filter circuit, an FPGA XC7Z020 data processing unit, a line state detection circuit, a carrier communication unit and a power supply unit.
The medium-voltage carrier is used for carrying out specific acquisition operation on time domain characteristics and frequency spectrum characteristics of line noise, analyzing and comparing results with normal values in a normal communication process, and screening out fault signals generated when a medium-voltage line fails through algorithm processing.
And the medium-voltage carrier coupler is used for coupling a fault signal of the medium-voltage line to the medium-voltage carrier slave.
And the line state monitoring system hung up and down from the master station can realize detection and monitoring of the medium-voltage line state according to preset carrier paths, domain value parameters and line parameters and obtain a line state conclusion.
The acquisition operation is to analyze and quantize information based on time domain characteristic analysis amplitude gradient by adopting 14-bit high-speed AD sampling.
The algorithm for screening the fault signals is that the frequency spectrum of the fault signals is extracted, the amplitude gradient information is extracted, and the frequency spectrum information of the fault signals is obtained through discrete Fourier change.
And the master network management station establishes a fault data system and performs analog screening on the fault signals.
The working principle of the 10kV line state detection system based on line noise monitoring is as follows:
when a 10kV line has a fault and a single-phase earth fault occurs, the transient process of the line has rich fault characteristics, and after a large amount of data verification, a fault waveform of the type shown in FIG. 2 is generated after a fault signal passes through a coupler, the characteristic quantity of the waveform is obvious on time domain information, the decay mode can realize the amplitude quantization of the sinusoidal signal to obtain the change state of the fault signal by following the cross-correlation function, the frequency domain characteristic information can be extracted by the discrete Fourier change, although the frequency spectrum information changes in different environments, the change trend of the frequency also has a gradual change process, a group of gradual change data can be obtained by collecting and extracting frequency information and combining time domain information, and effective fault waveforms are screened out by a carrier machine through data analysis and reported and are uniformly judged by a network management master station.
The line state monitoring process of the 10kV line state detection system based on line noise monitoring is as follows:
as shown in fig. 3, when a fault occurs between C1 and C2, a corresponding fault waveform is generated at the moment of the fault in the entire line, the transmission mode of the fault waveform is distributed, and the attenuation exists in the line itself, so the amplitude state of the fault signal at the farther place from the fault point is smaller, the fault waveform collected by the carrier between C1 and C2 is the largest, the carrier capable of receiving the fault signal on the line reports the collected fault information (amplitude and frequency spectrum) to the master station for analysis through the manager, after the master station receives the report of the abnormal information, the master station mainly determines according to the attenuation state of the fault signal, and after the strength of the fault information reported by each carrier is screened out, the line fault between the reported information nodes needs to be displayed on a topological graph.
Claims (5)
1. The utility model provides a 10kV line state detecting system based on line noise is listened which characterized in that: the system comprises a medium-voltage carrier machine, a medium-voltage carrier coupler and a line state analysis unit, wherein:
the medium-voltage carrier machine is used for carrying out specific acquisition operation on time domain characteristics and frequency spectrum characteristics of line noise, analyzing and comparing a result with a normal state value in a normal communication process, and screening out a fault signal generated when a medium-voltage line fails through algorithm processing;
the medium-voltage carrier coupler is used for coupling a fault signal generated by a medium-voltage line to the medium-voltage carrier slave;
and the line state monitoring system hung up and down from the master station can realize detection and monitoring of the medium-voltage line state according to preset carrier paths, domain value parameters and line parameters and obtain a line state conclusion.
2. The system for detecting the state of the 10kV line based on the line noise interception as claimed in claim 1, wherein the medium voltage carrier machine comprises a filter circuit, an FPGA XC7Z020 data processing unit, a line state detection circuit, a carrier communication unit and a power supply unit.
3. The system for detecting the state of the 10kV line based on the line noise monitoring as claimed in claim 1, wherein the acquisition operation is to perform analysis and quantization based on the time domain feature analysis information with gradual amplitude change by using 14-bit high-speed AD sampling.
4. The 10kV line state detection system based on line noise interception as recited in claim 1, wherein the algorithm for screening the fault signal is a fault signal spectrum extraction and an amplitude gradient information extraction, and the spectrum information of the fault signal is obtained by using discrete Fourier transform.
5. The system according to claim 1, wherein the network management master station is configured to establish a fault data system and perform analog screening on the fault signals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110009924.8A CN113655330A (en) | 2021-01-05 | 2021-01-05 | 10kV line state detection system based on line noise monitoring |
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| CN202110009924.8A CN113655330A (en) | 2021-01-05 | 2021-01-05 | 10kV line state detection system based on line noise monitoring |
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| CN113655330A true CN113655330A (en) | 2021-11-16 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558505A (en) * | 2013-10-23 | 2014-02-05 | 国家电网公司 | Method and device for detecting line flashover fault |
| CN107404335A (en) * | 2017-07-25 | 2017-11-28 | 国网福建省电力有限公司 | A kind of method that power circuit ensures power line communication in failure and inspecting state |
| CN109738763A (en) * | 2019-02-28 | 2019-05-10 | 国网湖北省电力有限公司黄石供电公司 | A kind of medium-voltage distribution cable short trouble localization method based on wavelet package transforms |
| CN111856204A (en) * | 2020-06-13 | 2020-10-30 | 青岛鼎信通讯股份有限公司 | 10kV line fault detection system based on carrier output impedance |
| CN212180939U (en) * | 2020-03-05 | 2020-12-18 | 国网青海省电力公司果洛供电公司 | 10kV line fault detection system based on medium-voltage carrier output impedance |
-
2021
- 2021-01-05 CN CN202110009924.8A patent/CN113655330A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558505A (en) * | 2013-10-23 | 2014-02-05 | 国家电网公司 | Method and device for detecting line flashover fault |
| CN107404335A (en) * | 2017-07-25 | 2017-11-28 | 国网福建省电力有限公司 | A kind of method that power circuit ensures power line communication in failure and inspecting state |
| CN109738763A (en) * | 2019-02-28 | 2019-05-10 | 国网湖北省电力有限公司黄石供电公司 | A kind of medium-voltage distribution cable short trouble localization method based on wavelet package transforms |
| CN212180939U (en) * | 2020-03-05 | 2020-12-18 | 国网青海省电力公司果洛供电公司 | 10kV line fault detection system based on medium-voltage carrier output impedance |
| CN111856204A (en) * | 2020-06-13 | 2020-10-30 | 青岛鼎信通讯股份有限公司 | 10kV line fault detection system based on carrier output impedance |
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Application publication date: 20211116 |