CN210572579U - On-line monitoring device for contaminated insulator - Google Patents
On-line monitoring device for contaminated insulator Download PDFInfo
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- CN210572579U CN210572579U CN201920988526.3U CN201920988526U CN210572579U CN 210572579 U CN210572579 U CN 210572579U CN 201920988526 U CN201920988526 U CN 201920988526U CN 210572579 U CN210572579 U CN 210572579U
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Abstract
The utility model discloses a filthy insulator on-line monitoring device, which comprises an on-line monitoring extension for collecting and sending leakage current data and a monitoring unit for receiving data; the online monitoring extension set comprises a leakage current sensor, a data processing and transmitting module, an energy management module and a timing starting module; the online monitoring extension obtains a leakage current signal through the leakage current sensor, acquires the leakage current signal through the data processing and sending module, performs filtering processing, and sends the acquired leakage current signal to the monitoring unit. The online monitoring system predicts the occurrence of pollution flashover through online monitoring of the insulators, and clearly discovers the position of the insulator with a leakage current signal through data transmitted by the online monitoring extension through the monitoring unit, so that the pollution flashover probability is reduced, and the working efficiency is improved.
Description
Technical Field
The utility model relates to an electric power industry technical field, concretely relates to filthy insulator on-line monitoring device.
Background
Along with the development of industrial and agricultural production, the line voltage grade is continuously improved, the coverage area of a power grid is successively enlarged, the total length of the line is mostly about hundreds of meters or even thousands of meters, the distance is long, the coverage area is wide, the passing areas are complex and changeable, the line is distributed in various environments such as cities, suburbs, fields and the like, the climate environment difference is large, the environment of part of sections is severe, the maintenance difficulty is large, and the discharge amount of industrial and agricultural waste gas and automobile exhaust gas is increased year by year, so that the climate environment is seriously deteriorated, the atmospheric pollution is aggravated, the situation faced by antifouling work is severe day by day, and the pollution accidents of a power transmission line occur occasionally.
The transmission line in various outdoor environments is difficult to be protected from atmospheric pollution when passing through heavily polluted areas and residential life areas, and pollutants are continuously deposited on the surface of the insulator in the operation process. When the weather is dry, the resistance of the pollution layer is large, the danger is small, the flashover voltage of the insulator is not changed greatly, and the insulator has high insulating property. When the humidity of the weather is very high or the weather is relatively humid, the pollution layer is wet, soluble pollutants deposited in the pollution layer on the surface of the insulator absorb water to form a conductive liquid film, the conductance of the pollution layer is obviously increased under the action of power frequency voltage, the leakage current flowing through the surface of the insulator is rapidly increased to form a drying zone, partial discharge is generated, the pollution flashover voltage of the insulator is reduced, the insulating property is reduced, and pollution flashover accidents are easily caused.
In order to prevent the pollution flashover of the insulator, the surface layer of the insulator is coated with a coating for strengthening the insulation and enhancing the water-based property or an organic coating, the insulator made of a novel material is used, the insulator is cleaned regularly, and the shape of the insulator is changed to improve the pollution flashover property.
The measures are adopted, so that the method can play a positive role in preventing the pollution flashover accident to a certain extent, but the methods belong to passive pollution flashover prevention measures, and the resource waste of manpower, material resources and financial resources is caused in the aspects of economy, technology, labor intensity and the like, and meanwhile, the pollution flashover accident is not easy to find and stop in time, and the pollution flashover accident cannot be controlled fundamentally. In order to overcome the defects of the traditional preventive measures, the pollution state characteristic quantity can be measured by monitoring the insulator on line, the pollution flashover is predicted before a pollution flashover accident occurs, and measures are taken in time to clean and check the insulator, so that the pollution flashover probability can be reduced, and the working efficiency is improved.
Disclosure of Invention
In view of the deficiencies of the prior art, the utility model aims at providing a filthy insulator on-line monitoring device, which is realized through the following technical scheme.
An on-line monitoring device for a contaminated insulator comprises an on-line monitoring extension for collecting and sending leakage current data and a monitoring unit for receiving data; the online monitoring extension set comprises a leakage current sensor, a data processing and transmitting module, an energy management module and a timing starting module; the online monitoring extension obtains a leakage current signal through the leakage current sensor, acquires the leakage current signal through the data processing and sending module, performs filtering processing, and sends the acquired leakage current signal to the monitoring unit.
Specifically, the online monitoring extension set is mainly responsible for collecting and sending leakage current data. The monitoring extension set obtains a corresponding leakage current signal through a high-precision micro-current sensor, samples the signal through an A/D conversion chip after protection, amplification and filtering, performs digital filtering by a microprocessor, packs the measured environmental information and transmits the packed environmental information to a railway bureau monitoring unit through a GPRS network.
Furthermore, the leakage current sensor adopts a broadband micro-current sensor and is designed to be a through type.
Further, the output line of the leakage current sensor adopts a shielding cable.
Further, the data processing and sending module is an ARM processor, and the acquisition frequency of the data processing and sending module is 3.2 kHz.
Further, the data processing and sending module comprises a piezoresistor and a measuring current sensor.
Further, the energy management module is a solar battery with an LT3652 chip, and the energy management module further comprises a storage battery.
Furthermore, the timing starting module comprises a single chip microcomputer and a clock chip, and the single chip microcomputer is an 8-bit microcontroller.
Compared with the prior art, the beneficial effects of the utility model reside in that:
1. the online monitoring system predicts the occurrence of pollution flashover by monitoring the insulators online, and definitely finds the position of the insulator with a leakage current signal by the monitoring unit through data transmitted by the online monitoring extension set, thereby reducing the pollution flashover probability and improving the working efficiency;
2. the online monitoring system adopts a mode of combining a piezoresistor and a measuring current sensor as an impact unit, so that accidental current transient damage to the online monitoring extension is effectively prevented;
3. the timing starting module adopted by the online monitoring system is only started to operate at a specific moment, so that the energy consumption of the online monitoring extension is reduced;
4. the on-line monitoring system combines the energy management module and the timing starting module for use, can meet the requirement that the on-line monitoring extension works continuously under the condition of no illumination, prolongs the working time and meets the requirement of working duration.
Drawings
FIG. 1 is a block diagram of the online monitoring extension of the present invention;
FIG. 2 is a schematic diagram of the power supply principle of the energy management module of the present invention;
fig. 3 is the working principle diagram of the timing starting module of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to 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," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present invention will be described in further detail below with reference to specific embodiments and with reference to the accompanying drawings.
Example 1
As shown in fig. 1-3, an online monitoring device for a contaminated insulator comprises an online monitoring extension for collecting and transmitting leakage current data and a monitoring unit for receiving data; the online monitoring extension set comprises a leakage current sensor, a data processing and transmitting module, an energy management module and a timing starting module; the online monitoring extension obtains a leakage current signal through the leakage current sensor, acquires the leakage current signal through the data processing and sending module, performs filtering processing on the leakage current signal, and sends the acquired leakage current signal to the monitoring unit; the on-line monitoring extension set is arranged along the railway.
The leakage current sensor adopts a broadband micro-current sensor and is designed to be a through type. Because the amplitude of the leakage current on the surface of the insulator is large in change and wide in frequency range, the leakage current sensor is required to sense a weak current signal, has good linearity, has a wide frequency band and has strong anti-electromagnetic interference capability. In the online monitoring extension set, a broadband micro-current sensor for online monitoring of the leakage current of the insulator of the contact network is adopted; the leakage current sensor is manufactured based on the Rogowski coil principle, is different from a mode of additionally arranging a collector ring to obtain leakage current, and avoids interference on a rear-end measuring loop by isolating signals from the ground on the basis of not influencing the running state and distribution parameters of the original insulator. In addition, the through design of the leakage current sensor enables the leakage current sensor to be conveniently installed on a connecting hardware fitting of the insulator and the support.
In order to prevent electromagnetic field interference and be suitable for a severe practical working environment, the output line of the leakage current sensor adopts a shielding cable.
The data processing and transmitting module is an ARM processor, and the acquisition frequency of the data processing and transmitting module is 3.2 kHz; the data processing and transmitting module comprises a piezoresistor and a measuring current sensor. The device is prevented from being damaged by accidental current transient, and the extension set adopts a mode of combining a piezoresistor and a measuring current sensor as an impact protection unit; firstly, amplifying and filtering the acquired signals at high frequency to meet the requirements of an A/D conversion chip.
After the ARM starts the A/D conversion chip, the chip samples the leakage current signal at the frequency of 3.2KHz, namely, 64 points are collected in each period for 50Hz power frequency signals. In order to ensure the real-time performance of data transmission, only data of 6 cycles are collected each time. And simultaneously, the ARM reads the environmental information of the temperature and humidity sensor.
After the data acquisition is finished, the device automatically enters a data sending link. The data is transmitted to the GPRS module under the control of the ARM processor, and then the GPRS module is sent to the monitoring center computer in the form of data packets. In the process, in order to ensure the accuracy of the transmitted data, a fixed frame data transmission mode is adopted, and the content of the fixed frame comprises a data head (O × aa), an address code, a command word, a standby parameter (0 × 00), a data length, a check code and a data tail (0 × 55); on the other hand, for each data received and sent, the ARM performs CRC16 check on the data, and the error rate of data transmission is further reduced.
Because the on-line monitoring extension is installed along the railway, the energy is obtained from the traction substation in a wire mode, and additional wires need to be erected. The online monitoring extension adopts a solar power supply mode taking LT3652 as a charging management chip, when sunlight is sufficient, the solar panel charges the storage battery on one hand, and directly provides power for a load on the other hand; when the weather condition is bad, the storage battery provides power. In addition, in order to prolong the service life of the storage battery, an over-discharge protection circuit of the storage battery is added.
The timing starting module mainly comprises an ultra-low power consumption singlechip and a clock chip. The single chip microcomputer adopts an ultra-low power consumption 8-bit microcontroller of ST company, and the lowest energy consumption is only 350nA when the SRAM content is kept. Typically, the ARM microprocessor is in a power-down state. When the set time in the single chip microcomputer is the same as the read time of the clock chip, the single chip microcomputer triggers a power supply pin of the ARM microprocessor, the collection of a leakage current signal is started, the time information is transmitted to the ARM processor in a bus mode, and meanwhile, the ARM microprocessor packs the time, the temperature, the humidity and the leakage current data together and transmits the time, the temperature and the humidity and the leakage current data to a computer of a railway bureau monitoring unit in a GPRS mode; when the on-line monitoring extension works, the staff of the railway bureau monitoring center can set the next starting time of the singlechip through the ARM microprocessor.
The monitoring unit comprises a main interface which can display the leakage current waveform and the environmental information of the post insulator, so that an operator can inquire and store data at any time, generate a working report and the like, and realize the functions of remote communication, GPRS module debugging, instruction modification and the like; it can be seen from the data display interface of the monitoring center that the positions of the monitoring extensions correspond to the received leakage current data one by one, and the position of the insulator for sending the leakage current signal is determined.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not depart from the essence of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. An on-line monitoring device for a contaminated insulator is characterized by comprising an on-line monitoring extension for collecting and sending leakage current data and a monitoring unit for receiving data; the online monitoring extension set comprises a leakage current sensor, a data processing and transmitting module, an energy management module and a timing starting module; the online monitoring extension obtains a leakage current signal through the leakage current sensor, acquires the leakage current signal through the data processing and sending module, performs filtering processing, and sends the acquired leakage current signal to the monitoring unit.
2. The on-line filth insulator monitoring device according to claim 1, wherein the leakage current sensor is a broadband micro-current sensor, and the leakage current sensor is designed to be a feed-through type.
3. The on-line filth insulator monitoring device according to claim 2, wherein a shielded cable is used for an output line of the leakage current sensor.
4. The on-line filth insulator monitoring device of claim 1, wherein the data processing and sending module is an ARM processor, and the acquisition frequency of the data processing and sending module is 3.2 kHz.
5. The on-line filth insulator monitoring device according to claim 4, wherein the data processing and transmitting module comprises a voltage dependent resistor and a measuring current sensor.
6. The online filth insulator monitoring device according to claim 1, wherein the energy management module is a solar cell with an LT3652 chip, and the energy management module further comprises a storage battery.
7. The on-line filth insulator monitoring device according to claim 1, wherein the timing starting module comprises a single chip microcomputer and a clock chip, and the single chip microcomputer is an 8-bit microcontroller.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920988526.3U CN210572579U (en) | 2019-06-28 | 2019-06-28 | On-line monitoring device for contaminated insulator |
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| CN201920988526.3U CN210572579U (en) | 2019-06-28 | 2019-06-28 | On-line monitoring device for contaminated insulator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114509107A (en) * | 2022-01-04 | 2022-05-17 | 西安理工大学 | Online monitoring device and online monitoring method for contact net insulator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114509107A (en) * | 2022-01-04 | 2022-05-17 | 西安理工大学 | Online monitoring device and online monitoring method for contact net insulator |
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