CN214375062U - Lightning arrester operation performance on-line monitoring system - Google Patents
Lightning arrester operation performance on-line monitoring system Download PDFInfo
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- CN214375062U CN214375062U CN202120344514.4U CN202120344514U CN214375062U CN 214375062 U CN214375062 U CN 214375062U CN 202120344514 U CN202120344514 U CN 202120344514U CN 214375062 U CN214375062 U CN 214375062U
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Abstract
The utility model discloses an arrester operation performance on-line monitoring system, which comprises a front-end acquisition device and an on-line monitoring comprehensive processing device, wherein the front-end acquisition device is used for acquiring data of an arrester, and the acquired data comprises arrester leakage current, secondary voltage and environment temperature and humidity; the online monitoring comprehensive processing device is used for analyzing the voltage and the harmonic ratio of each time of the leakage current in real time according to the leakage current and the secondary voltage of the lightning arrester collected by the front-end collecting device to obtain a plurality of parameters, and comprehensively judging the running state of the lightning arrester by combining the environment temperature and the environment humidity. The online monitoring system integrates an embedded DSP microprocessor technology, a third harmonic analysis technology, a pilot frequency signal injection detection technology, a weak signal acquisition technology, a low power consumption technology and a background big data analysis technology, can clearly and accurately analyze the running state of the arrester by measuring relevant data of the arrester, and provides the most intuitive data for state maintenance work to judge.
Description
Technical Field
The utility model relates to an electric power system technical field especially relates to an arrester operating performance on-line monitoring system.
Background
Metal Oxide Arresters (MOAs) have found wide application in power plants and substations due to their superior overvoltage protection characteristics. However, the malfunction of the MOA may cause explosion, which affects the safe operation of the system, and the lightning arrester in operation must be effectively detected and periodically pre-tested. The lightning arrester is tested without power cut, because the main equipment is required to be stopped in advance, but sometimes the main equipment cannot be stopped due to the limitation of the operation mode, the lightning arrester cannot be tested in advance on time, and the lightning arrester test without power cut is particularly important.
One of the current effective means for monitoring the state of the arrester is to measure the total current of the arrester, specifically, a leakage current monitor is installed on the arrester of 110KV grade or above, the magnitude and the variation trend of the leakage current are monitored by regularly and manually inspecting for unified analysis, and the aging and insulation damage degree of the arrester are judged by recording the total current. However, the total current obtained by this measurement method only includes the sum of the surface leakage current, the internal leakage current, and the bulk capacitance current of the arrester, and it cannot effectively reflect the real operation condition of the internal insulation (the quality of the bracket insulation, the inner wall insulation, the zinc oxide sheet, etc.) of the arrester.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides an arrester operation performance on-line monitoring system, the problem that solution present operation current situation that can be fine exists. The online monitoring system integrates an embedded DSP microprocessor technology, a third harmonic analysis technology, a pilot frequency signal injection detection technology, a weak signal acquisition technology, a low power consumption technology and a background big data analysis technology, can clearly and accurately analyze the running condition of the arrester by measuring the total current, the resistive current, the loss power and the like of the arrester, and provides the most intuitive data for judgment for the state maintenance work.
An arrester operation performance on-line monitoring system comprises:
the front-end acquisition device is used for acquiring data of the lightning arrester, and the acquired data comprises leakage current of the lightning arrester, secondary voltage and environment temperature and humidity;
the online monitoring comprehensive processing device is used for analyzing the harmonic ratio of the voltage and the leakage current in each time to obtain a plurality of parameters according to the leakage current and the secondary voltage of the lightning arrester collected by the front-end collecting device, and comprehensively judging the running state of the lightning arrester by combining the environmental temperature and the environmental humidity; the parameter quantities comprise fundamental wave current, harmonic current, resistive current, capacitive current and third harmonic current; and the data acquired by the front-end acquisition device is transmitted to the online monitoring comprehensive processing device in a wired or wireless mode.
Further, the front end collecting device comprises:
the current sensor is used for collecting leakage current of the lightning arrester and taking the leakage current as a current signal to be analyzed, and the signal output end of the current sensor is connected with the signal input end of the on-line monitoring comprehensive processing device;
the voltage transformer is used for converting the bus voltage into a secondary voltage and taking the secondary voltage as a voltage reference signal, and the signal output end of the voltage transformer is connected with the signal input end of the on-line monitoring comprehensive processing device;
and the temperature and humidity sensor is used for detecting temperature and humidity information of the environment where the lightning arrester is located, and the signal output end of the temperature and humidity sensor is connected with the signal input end of the on-line monitoring comprehensive processing device.
Further, the online monitoring integrated processing device comprises:
the signal input end of the analog-digital conversion circuit is connected with the signal output ends of the voltage transformer, the current sensor and the temperature and humidity sensor and is used for converting the current signal to be analyzed, the voltage reference signal and the temperature and humidity information into digital signals;
and the signal input end of the digital signal processing circuit is connected with the signal output end of the analog-digital conversion circuit and is used for obtaining the environment temperature and humidity according to the digital signal, analyzing the subharmonic ratio of the voltage and the leakage current in real time to obtain a plurality of parameters, and comprehensively judging the running state of the lightning arrester by combining the environment temperature and humidity and the parameters.
Further, the comprehensive judgment of the operating state of the lightning arrester by combining the environmental temperature and humidity and the plurality of parameters comprises: training the multilayer neural network system by adopting the multilayer neural network system and utilizing the existing data information and experience results to approach the known results; and carrying out generalization detection on the multilayer neural network system through more known information to obtain an approved MISO model, namely a multi-input single-output model, so as to output the running state of the lightning arrester according to the input environment temperature and humidity and a plurality of parameters.
Further, the data collected by the front-end collecting device is transmitted to the on-line monitoring comprehensive processing device through an optical fiber or an RS485 communication line.
Furthermore, the front-end acquisition device and the online monitoring integrated processing device realize data synchronization through a GPS or Beidou time service system.
The beneficial effects of the utility model reside in that:
the utility model discloses an arrester performance on-line monitoring system passes through front end collection system and gathers arrester leakage current, secondary voltage and environment humiture etc. and rethread on-line monitoring synthesizes processing apparatus real-time analysis and goes out voltage and each subharmonic of leakage current and compare in order to obtain a plurality of parameter quantity to thereby combine environment humiture to synthesize the running state who judges out the arrester. The online monitoring system integrates an embedded DSP microprocessor technology, a third harmonic analysis technology, a pilot frequency signal injection detection technology, a weak signal acquisition technology, a low power consumption technology and a background big data analysis technology, can clearly and accurately analyze the running state of the arrester by measuring relevant data of the arrester, and provides the most intuitive data for state maintenance work to judge.
Drawings
FIG. 1 is a simplified isometric view of a zinc oxide arrester;
FIG. 2 is a graph of voltage versus current for a zinc oxide arrester;
FIG. 3 is a schematic diagram of the signal acquisition and processing principle of the present invention;
fig. 43 is a diagram of determination of leakage current versus arrester state;
FIG. 5 is a schematic view of the online monitoring system for the operational performance of the lightning arrester of the present invention;
fig. 6 is a schematic diagram of an analog-to-digital conversion circuit according to a preferred embodiment of the present invention;
fig. 7 is a schematic diagram of a digital signal processing circuit according to a preferred embodiment of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, the embodiments of the present invention will be described. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model discloses a theoretical basis of arrester performance on-line monitoring system and realization principle as follows:
first, the reason for increasing the resistive leakage current of the lightning arrester
1. Internal insulation reduction due to internal moisture of the arrester:
the lightning arrester is assembled under normal weather conditions during manufacture, and certain humidity is reserved; the moisture absorption of the insulating material in the lightning arrester or the moisture in the lightning arrester is not removed for assembly, and the moisture is slowly released after the lightning arrester is put into operation; the body and the sealing port have breathing function; the material of the outer porcelain sleeve is aged or has respiration effect.
2. The zinc oxide sheet body of the lightning arrester changes (ages) in quality under the current load:
the accumulation effect is caused by the impact of large lightning current; high internal overvoltage surge; natural aging under long-term operating voltage; the through flow capacity of the zinc oxide sheet does not accord with the actual through flow, so that the aging is accelerated.
Second, data acquisition principle
As shown in fig. 1, the relationship between the capacitive current Ic, the resistive current Ir and the total current Ix is as follows:
Ix＝Ic+Ir
under normal voltage, the arrester is below the pre-breakdown voltage:
1. when the lightning arrester is affected with damp, Ic and Ir are increased, and Ix is increased;
2. after the ZnO (zinc oxide) valve plate is aged, Ix is not obviously increased, but Ir is obviously increased;
3. the ZnO resistance has nonlinear characteristics with the voltage change, as shown in FIG. 2, so that the resistive current presents multiple harmonics.
In the actual collection operation, Ir cannot be directly detected, but the total current (total current) Ix and the bus voltage U can be collected. As shown in fig. 3, the respective harmonic currents of Ir and Ic and Ir are obtained by ADC (analog-digital conversion circuit) conversion and DSP (digital signal processing circuit) decomposition.
Third, data processing principle
According to the current research situation, the power grid actually has very complex noise signals and harmonic signals. The current signal that the arrester was gathered is very weak, easily receives the interference of other signals even co-frequency out of phase signal interference. The frequency estimation of multi-frequency signals under the background of noise is a hot issue of domestic and foreign research and is also the key point of effective information extraction of lightning arresters. Currently, the commonly used signal frequency estimation methods include: an energy center of gravity method, a multiple FFT (fast Fourier transform) iteration method, a ratio method, a phase difference method and an FFT + DFT (discrete Fourier transform) spectrum continuous refining method. Among these methods, the frequency estimation accuracy is highest by a "time shift phase difference spectrum correction method" which is one type of the phase difference method. The above various calibration methods are performed under the conventional FFT architecture, but the spectrum leakage effect common to FFT is determined to affect the calibration accuracy, and although the windowing can improve the leakage problem, its effect is always limited.
The utility model discloses an on-line monitoring system adopts one kind to have the all-phase FFT (all-phaseFFT, apFFT) spectral analysis method of better suppression spectrum leakage performance, just can measure the frequency of needs through the all-phase FFT, can provide more accurate judgement foundation for arrester on-line monitoring through accurate fundamental wave information and harmonic information. As shown in fig. 4, the data of 3 times leakage current can more intuitively express the specific situations of lightning arrester aging and moisture, and if the lightning arrester is aged, 3 times of harmonic waves are generated; if the arrester is affected with damp, the 3 rd harmonic component is reduced, and the resistive current is increased. Through statistics and theoretical analysis, incorporate 3 harmonics the utility model discloses an come to have very breakthrough promotion to the state judgement accuracy of arrester among the on-line monitoring system.
Since the processed data includes fundamental current, harmonic current, capacitive resistive component, phase information, temperature and humidity information, and the like, if only one or two items of information are considered, the data is very easily restricted by the data information, i.e. the consideration is not comprehensive enough. Therefore, how to effectively judge the state condition of the lightning arrester under the condition of a plurality of input parameters is one of the key means of data processing.
The utility model discloses an on-line monitoring system has adopted multilayer neural network system, utilizes existing data information and experience result to train multilayer neural network system, approaches known result. And performing generalization detection on the information through more known information to obtain an approved MISO model (multiple input single output model), and completing analysis processing of the back-end information. As data continues to accumulate, the model becomes more accurate and intelligent as the amount of data increases.
Therefore, based on above-mentioned theoretical basis and realization principle, the utility model provides an arrester working property on-line monitoring system, as shown in fig. 5, including front end collection system and on-line monitoring integrated processing device, wherein: the front-end acquisition device is used for acquiring data of the lightning arrester, and the acquired data comprises leakage current of the lightning arrester, secondary voltage and environment temperature and humidity and is transmitted to the online monitoring comprehensive processing device in a wired or wireless mode; the online monitoring comprehensive processing device is used for analyzing the voltage and the leakage current subharmonic ratio in real time according to the leakage current and the secondary voltage of the lightning arrester collected by the front-end collecting device to obtain a plurality of parameters, and comprehensively judging the running state of the lightning arrester by combining the environmental temperature and humidity. The parameter quantities comprise fundamental wave current, harmonic current, resistive current, capacitive current and third harmonic current.
The front-end acquisition device comprises a current sensor, a voltage transformer and a temperature and humidity sensor, wherein the current sensor is used for acquiring leakage current of the lightning arrester and is used as a current signal to be analyzed, and a signal output end of the current sensor is connected with a signal input end of the on-line monitoring comprehensive processing device; the voltage transformer is used for converting the bus voltage into secondary voltage and taking the secondary voltage as a voltage reference signal, and the signal output end of the voltage transformer is connected with the signal input end of the on-line monitoring comprehensive processing device; the temperature and humidity sensor is used for detecting temperature and humidity information of the environment where the lightning arrester is located, and a signal output end of the temperature and humidity sensor is connected with a signal input end of the online monitoring comprehensive processing device.
Specifically, the on-line monitoring integrated processing device comprises an analog-digital conversion circuit and a digital signal processing circuit, wherein a signal input end of the analog-digital conversion circuit is connected with signal output ends of a voltage transformer, a current sensor and a temperature and humidity sensor and is used for converting a current signal to be analyzed, a voltage reference signal and temperature and humidity information into digital signals; the signal input end of the digital signal processing circuit is connected with the signal output end of the analog-digital conversion circuit and used for obtaining environment temperature and humidity according to the digital signals, analyzing the harmonic ratio of each time of voltage and leakage current in real time to obtain a plurality of parameters, and comprehensively judging the running state of the lightning arrester by combining the environment temperature and humidity and the parameters.
In a preferred embodiment of the present invention, the analog-to-digital conversion circuit mainly uses an AD7606P chip, and a schematic circuit diagram thereof is shown in fig. 6. The digital signal processing circuit mainly adopts an STM32F407VE chip with DSP (digital signal processing) and FPU (floating point arithmetic unit), and an SN74AHCT00D type logic gate chip, IPS6404L type pseudo static random access memory, and TJA1050 type high-speed CAN transceiver, and its circuit schematic diagram is shown in fig. 7.
In another preferred embodiment of the present invention, the current sensor is an FS-S1010 type current sensor, the voltage transformer is a metasxing electronic TV54a71-57.7/1.47V type voltage transformer, and the temperature and humidity sensor is a WSK-zrb (th) type temperature and humidity controller.
In another preferred embodiment of the present invention, the data collected by the front-end collecting device is transmitted to the on-line monitoring integrated processing device through an optical fiber or an RS485 communication line.
In another preferred embodiment of the present invention, the front-end acquisition device and the on-line monitoring integrated processing device realize data synchronization through a GPS or a beidou time service system.
The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited to the precise forms disclosed herein, and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the invention as defined by the appended claims. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element to which the present invention is directed must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either a wired or wireless connection.
Claims (6)
1. The utility model provides an arrester performance on-line monitoring system which characterized in that includes:
the front-end acquisition device is used for acquiring data of the lightning arrester, and the acquired data comprises leakage current of the lightning arrester, secondary voltage and environment temperature and humidity;
the online monitoring comprehensive processing device is used for analyzing the harmonic ratio of the voltage and the leakage current in each time to obtain a plurality of parameters according to the leakage current and the secondary voltage of the lightning arrester collected by the front-end collecting device, and comprehensively judging the running state of the lightning arrester by combining the environmental temperature and the environmental humidity; the parameter quantities comprise fundamental wave current, harmonic current, resistive current, capacitive current and third harmonic current; and the data acquired by the front-end acquisition device is transmitted to the online monitoring comprehensive processing device in a wired or wireless mode.
2. The on-line monitoring system for the running performance of the lightning arrester according to claim 1, wherein the front end acquisition device comprises:
the current sensor is used for collecting leakage current of the lightning arrester and taking the leakage current as a current signal to be analyzed, and the signal output end of the current sensor is connected with the signal input end of the on-line monitoring comprehensive processing device;
the voltage transformer is used for converting the bus voltage into a secondary voltage and taking the secondary voltage as a voltage reference signal, and the signal output end of the voltage transformer is connected with the signal input end of the on-line monitoring comprehensive processing device;
and the temperature and humidity sensor is used for detecting temperature and humidity information of the environment where the lightning arrester is located, and the signal output end of the temperature and humidity sensor is connected with the signal input end of the on-line monitoring comprehensive processing device.
3. The on-line monitoring system for the running performance of the lightning arrester according to claim 2, wherein the on-line monitoring comprehensive processing device comprises:
the signal input end of the analog-digital conversion circuit is connected with the signal output ends of the voltage transformer, the current sensor and the temperature and humidity sensor and is used for converting the current signal to be analyzed, the voltage reference signal and the temperature and humidity information into digital signals;
and the signal input end of the digital signal processing circuit is connected with the signal output end of the analog-digital conversion circuit and is used for obtaining the environment temperature and humidity according to the digital signal, analyzing the subharmonic ratio of the voltage and the leakage current in real time to obtain a plurality of parameters, and comprehensively judging the running state of the lightning arrester by combining the environment temperature and humidity and the parameters.
4. The on-line monitoring system for the running performance of the lightning arrester according to claim 3, wherein the comprehensive judgment of the running state of the lightning arrester by combining the environmental temperature and humidity and the plurality of parameters comprises: training the multilayer neural network system by adopting the multilayer neural network system and utilizing the existing data information and experience results to approach the known results; and carrying out generalization detection on the multilayer neural network system through more known information to obtain an approved MISO model, namely a multi-input single-output model, so as to output the running state of the lightning arrester according to the input environment temperature and humidity and a plurality of parameters.
5. The on-line monitoring system for the running performance of the lightning arrester as claimed in any one of claims 1 to 4, wherein the data collected by the front-end collecting device is transmitted to the on-line monitoring comprehensive processing device through an optical fiber or an RS485 communication line.
6. The lightning arrester operation performance online monitoring system according to any one of claims 1 to 4, wherein the front-end acquisition device and the online monitoring comprehensive processing device realize data synchronization through a GPS or Beidou time service system.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114236297A (en) * | 2022-02-15 | 2022-03-25 | 西安西电避雷器有限责任公司 | Lightning arrester on-line monitoring system |
| CN114660387A (en) * | 2022-03-18 | 2022-06-24 | 国网安徽省电力有限公司马鞍山供电公司 | Lightning arrester monitoring method based on leakage current sensor and BP neural network algorithm |
| CN116680621A (en) * | 2023-08-02 | 2023-09-01 | 国网江苏省电力有限公司 | Lightning arrester phase angle difference prediction method, device, equipment and storage medium |
-
2021
- 2021-02-06 CN CN202120344514.4U patent/CN214375062U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114236297A (en) * | 2022-02-15 | 2022-03-25 | 西安西电避雷器有限责任公司 | Lightning arrester on-line monitoring system |
| CN114660387A (en) * | 2022-03-18 | 2022-06-24 | 国网安徽省电力有限公司马鞍山供电公司 | Lightning arrester monitoring method based on leakage current sensor and BP neural network algorithm |
| CN116680621A (en) * | 2023-08-02 | 2023-09-01 | 国网江苏省电力有限公司 | Lightning arrester phase angle difference prediction method, device, equipment and storage medium |
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