CN214041619U - Transmission line insulator on-line monitoring device - Google Patents
Transmission line insulator on-line monitoring device Download PDFInfo
- Publication number
- CN214041619U CN214041619U CN202022727950.8U CN202022727950U CN214041619U CN 214041619 U CN214041619 U CN 214041619U CN 202022727950 U CN202022727950 U CN 202022727950U CN 214041619 U CN214041619 U CN 214041619U
- Authority
- CN
- China
- Prior art keywords
- module
- electrically connected
- insulator
- adopts
- monitoring device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000012212 insulator Substances 0.000 title claims abstract description 49
- 238000012806 monitoring device Methods 0.000 title claims abstract description 34
- 230000005540 biological transmission Effects 0.000 title claims abstract description 18
- 230000003287 optical effect Effects 0.000 claims abstract description 25
- 238000012545 processing Methods 0.000 claims abstract description 15
- 238000012544 monitoring process Methods 0.000 claims abstract description 12
- 238000004458 analytical method Methods 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims description 33
- 238000004891 communication Methods 0.000 claims description 33
- 230000003321 amplification Effects 0.000 claims description 24
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 24
- 238000002955 isolation Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 10
- 238000013500 data storage Methods 0.000 claims description 7
- 239000000084 colloidal system Substances 0.000 claims description 2
- 229910021421 monocrystalline silicon Inorganic materials 0.000 claims description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 2
- 230000004044 response Effects 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 abstract 1
- 238000011897 real-time detection Methods 0.000 abstract 1
- 238000011109 contamination Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000012351 Integrated analysis Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000009422 external insulation Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model relates to a transmission line insulator on-line monitoring device belongs to power equipment fault monitoring field. The device comprises an optical sensor pollution monitoring device, a leakage current online monitoring device and a monitoring center, the device can monitor the surface pollution degree and the leakage current of the insulator of the power transmission line in real time, and the monitoring center comprehensively analyzes the working state of the insulator according to the surface pollution degree monitoring value and the leakage current monitoring value of the insulator. The utility model discloses design the filthy monitoring devices of light sensor, the filthy degree in real-time detection insulator surface designs leakage current on-line monitoring devices, gathers, data processing obtains the characteristic vector and sends the leakage current signal that obtains. Through comprehensive analysis of the pollution degree and leakage current on the surface of the insulator, the working state of the insulator is mastered in real time, and instructive suggestions are provided for cleaning the pollution of the insulator.
Description
Technical Field
The utility model belongs to power equipment fault monitoring field relates to a transmission line insulator on-line monitoring device.
Background
The safety and reliability of the power transmission line directly influence the power supply performance, and the insulator ensures the insulation between the wire and the tower and plays a vital role in the power distribution line. The insulator surface adheres to filth and exposes in external environment, and when meetting the great climatic condition of humidity, the filth on insulator surface forms electrically conductive channel, leads to the insulator to take place the pollution flashover, and external insulation is long-pending dirty leads to overhead transmission line to take place the pollution flashover easily, and the insulating properties of transmission line is directly influenced to the weight of its long-pending dirty degree. The longer the running time of the insulator is, the more filth is accumulated on the surface of the insulator, and when the insulator is dry, the filth cannot form a conductive layer on the surface of the insulator, so that the insulator is kept in a good running state. However, under the conditions of high atmospheric humidity such as overcast and rainy, snow, fog and the like, water is accumulated on the surface of the insulator, salt substances in the pollutants are dissolved in the water to form a conductive layer, and flashover occurs on the surface of the insulator. In order to reduce pollution flashover, the power department supervises and maintains the insulator in a mode of regular inspection and maintenance, but has limitations, and the regular inspection and maintenance needs power failure, consumes manpower and causes economic loss. The most widespread insulator monitoring technology at present is a leakage current detection method, which comprehensively reflects the insulation performance of an insulator by collecting leakage current on the insulator and analyzing harmonic components contained in the leakage current. However, the leakage current detection method also has certain limitations, such as a single characteristic amount, a low frequency, and the like.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a transmission line insulator on-line monitoring device.
In order to achieve the above purpose, the utility model provides a following technical scheme:
an on-line monitoring device for an insulator of a power transmission line comprises an optical sensor pollution monitoring device, a leakage current on-line monitoring device and a monitoring center;
optionally, the optical sensor contamination monitoring device includes a power supply module, an optical sensor module, an isolation protection module, a photoelectric conversion module, a data acquisition module, a main control module, a communication module, and a server module;
the power supply module comprises a solar panel, a solar controller and a storage battery;
one end of the optical sensor module is electrically connected with the power supply module, and the other end of the optical sensor module is electrically connected with the isolation protection module;
one end of the isolation protection module is connected with the optical sensor module, and the other end of the isolation protection module is electrically connected with the photoelectric conversion module;
one end of the photoelectric conversion module is electrically connected with the isolation protection module, and the other end of the photoelectric conversion module is electrically connected with the data acquisition module;
one end of the data acquisition module is electrically connected with the photoelectric conversion module, and the other end of the data acquisition module is electrically connected with the main control module;
one end of the main control module is electrically connected with the data acquisition module, and the other end of the main control module is electrically connected with the communication module;
one end of the communication module is electrically connected with the main control module, and the other end of the communication module is electrically connected with the background monitoring center;
the server module is responsible for receiving data and analyzing and processing the data at a far end.
Optionally, the optical sensor contamination monitoring apparatus hardware includes a power supply, a core board, an optical sensor, a light source, a temperature sensor, a humidity sensor, a digital-to-analog conversion module, a GPRS wireless communication module, a serial communication circuit, and an alarm;
the power supply consists of a monocrystalline silicon or polycrystalline silicon solar panel, a colloid solar storage battery and a full-waterproof high-stability solar controller, and is electrically connected with the core board;
the core board adopts an STM32F107VCT6 chip;
the optical sensor adopts a high-precision double-digital-display type optical line sensor FX-520N and is electrically connected with the digital-to-analog conversion module;
the light source adopts an infrared light LED tube body, the power voltage is 12-24V, and the power supply is electrically connected;
the temperature sensor adopts an LM35CZ temperature sensor, the temperature measuring range is-40-110 ℃, the sensitivity of the LM35CZ temperature sensor is 11.0 mV/DEG C, the range of the output value of the using voltage is-0.4V-1.1V, and the temperature sensor is electrically connected with the digital-to-analog conversion module;
the humidity sensor is in an IH-3605A type, the voltage selection range is 0.8-4.0V, and the humidity sensor is electrically connected with the digital-to-analog conversion module;
the digital-to-analog conversion module selects a complete 16-bit sigma-delta converter AD7705 and is electrically connected with the core board;
the GPRS wireless communication module adopts EM310 as a GPRS wireless communication module of the line monitoring terminal, has the functions of multi-path connection and ACK response providing and is electrically connected with the core board;
the serial communication circuit adopts a MAX232 chip, can generate 232 electrical levels through MAX232 and is electrically connected with the core board;
the alarm adopts an A7-256 Bi-C-bus type network alarm host, simultaneously supports an RS485 bus and a power supply bus, and is electrically connected with the core board.
Optionally, the online leakage current monitoring device comprises a power supply part, a current acquisition module, a differential amplification module, a low-pass filtering module, a secondary amplification module, an analog-to-digital conversion module, a digital signal processing part, a wireless communication part, a data storage module, a harmonic analysis module and an effective value pulse frequency module;
the power supply part adopts a combination mode of a solar panel and a storage battery, adopts an integrated LM317 with a fixed three-terminal voltage stabilizing circuit to realize voltage conversion, and is electrically connected with the GPRS wireless communication module;
the current acquisition module is electrically connected with the differential amplification module;
the difference amplification module adopts an RC4580 two-way operational amplifier, one end of the difference amplification module is electrically connected with the current acquisition module, and the other end of the difference amplification module is electrically connected with the low-pass filter;
the low-pass filtering module adopts an active second-order filter, the attenuation rate of a stop band can reach-40/decade frequency multiplication, interference signals can be effectively filtered, one end of the low-pass filtering module is electrically connected with the differential amplification module, and the other end of the low-pass filtering module is electrically connected with the second-order amplification module;
the secondary amplification module adopts LM224 to realize double amplification, one end of the secondary amplification module is electrically connected with the low-pass filtering module, and the other end of the secondary amplification module is electrically connected with the analog-to-digital conversion module;
one end of the analog-to-digital conversion module is electrically connected with the secondary amplification module, and the other end of the analog-to-digital conversion module is electrically connected with the digital signal processing part;
the DSP part of the digital signal processing adopts DSP28335, an ADC module in the DSP28335 has 12-bit resolution and is respectively and electrically connected with the effective value pulse frequency module, the analog-to-digital conversion module, the GPRS wireless communication module and the harmonic analysis module;
the GPRS wireless communication module adopts GTM900-C as a GPRS module and is respectively and electrically connected with the digital signal processing DSP part, the data storage module and the power supply part;
the data storage module is electrically connected with the GPRS wireless communication module;
the harmonic analysis module is electrically connected with the digital signal processing DSP part;
the effective value pulse frequency module is electrically connected with the digital signal processing DSP part;
optionally, the monitoring center comprehensively analyzes the working state of the insulator and is electrically connected with the communication module.
The beneficial effects of the utility model reside in that: the dirty monitoring devices of light sensor who designs adopts optical fiber sensor to the dirty real-time supervision of insulator top layer, break through the manual sampling measurement of traditional salt density method and waste time and energy and can't real-time long-range know the limitation of the dirty situation of insulator, and through leakage current on-line monitoring device, consider from the angle of prevention pollution flashover, collect the dirty heavy dirty state that the change of the dirty process leakage current of insulator judges the insulator in real time, judge the operating condition of insulator at the information of two monitoring devices of surveillance center integrated analysis transmission, reach the purpose that the prevention was administered.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a diagram of an on-line monitoring device for an insulator of a power transmission line;
FIG. 2 is a diagram of a contamination monitoring device with optical sensors;
FIG. 3 illustrates the hardware components of the contamination monitoring device;
fig. 4 is a structural diagram of the leakage current on-line monitoring device.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms according to specific situations.
Fig. 1 to 4 show an online monitoring device for insulators of power transmission lines.
The optical sensor pollution monitoring device regularly and actively acquires and stores data such as salt density, ash density, air temperature, relative humidity and the like near the insulator of the power transmission line according to a set sampling period. The output end of the optical sensor is connected to the input end of the isolation protection module, and then the optical signal is converted into an electric signal by the photoelectric conversion module, the electric signal is output and connected with the input end of the data acquisition module, the output end of the data acquisition module is connected with the input end of the main control module, the output end of the main control module is connected with the input end of the communication module, the measuring result is transmitted to the background monitoring system through the communication network at regular time, the online monitoring is implemented by using the data communication technology, the pollution detection of the insulator does not need to be carried out, the real-time monitoring and the data analysis are carried out, the pollution condition of the insulator is mastered.
The leakage current online monitoring device obtains the leakage current of the insulator through a zero-flux sensor, and a source compensation device improves the measurement precision; the differential amplifier extracts and amplifies signals, and an active second-order filter is applied to filter the signals, so that the influence of external interference and operational amplifier noise on the signals is reduced; the DSP performs data acquisition through the ADC, and performs signal analysis by using the windowing FFT after data is obtained to obtain characteristic quantity; in order to judge the state of the insulator better, the time domain and frequency domain characteristics of leakage current are considered comprehensively, and three characteristic quantities of the ratio of third harmonic to fundamental wave, the ratio of third harmonic to fifth harmonic and amplitude pulse frequency are set to reflect the state of the insulator; and the GPRS wireless network is used for transmitting data, the monitoring computer is used as a terminal for receiving and storing the data, the Labview is used for calling the data storage unit, the characteristic quantity is drawn, and the operation trend of the insulator is visually analyzed.
The monitoring center comprehensively analyzes the information transmitted by the two monitoring devices to judge the dirt degree and the working state of the surface of the insulator, so that the purpose of prevention and treatment is achieved.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.
Claims (4)
1. The utility model provides a transmission line insulator on-line monitoring device which characterized in that: the device comprises an optical sensor pollution monitoring device, a leakage current on-line monitoring device and a monitoring center;
the optical sensor pollution monitoring device comprises a power supply module, an optical sensor module, an isolation protection module, a photoelectric conversion module, a data acquisition module, a main control module, a communication module and a server module;
the power supply module comprises a solar panel, a solar controller and a storage battery;
one end of the optical sensor module is electrically connected with the power supply module, and the other end of the optical sensor module is electrically connected with the isolation protection module;
one end of the isolation protection module is connected with the optical sensor module, and the other end of the isolation protection module is electrically connected with the photoelectric conversion module;
one end of the photoelectric conversion module is electrically connected with the isolation protection module, and the other end of the photoelectric conversion module is electrically connected with the data acquisition module;
one end of the data acquisition module is electrically connected with the photoelectric conversion module, and the other end of the data acquisition module is electrically connected with the main control module;
one end of the main control module is electrically connected with the data acquisition module, and the other end of the main control module is electrically connected with the communication module;
one end of the communication module is electrically connected with the main control module, and the other end of the communication module is electrically connected with the background monitoring center;
the server module is responsible for receiving data from a remote end and analyzing and processing the data.
2. The on-line monitoring device for the insulators of the power transmission line according to claim 1, characterized in that: the optical sensor pollution monitoring device hardware comprises a power supply, a core board, an optical sensor, a light source, a temperature sensor, a humidity sensor, a digital-to-analog conversion module, a GPRS wireless communication module, a serial communication circuit and an alarm;
the power supply consists of a monocrystalline silicon or polycrystalline silicon solar panel, a colloid solar storage battery and a full-waterproof high-stability solar controller, and is electrically connected with the core board;
the core board adopts an STM32F107VCT6 chip;
the optical sensor adopts a high-precision double-digital-display type optical line sensor FX-520N and is electrically connected with the digital-to-analog conversion module;
the light source adopts an infrared light LED tube body, the power voltage is 12-24V, and the power supply is electrically connected;
the temperature sensor adopts an LM35CZ temperature sensor, the temperature measuring range is-40-110 ℃, the sensitivity of the LM35CZ temperature sensor is 11.0 mV/DEG C, the range of the output value of the using voltage is-0.4V-1.1V, and the temperature sensor is electrically connected with the digital-to-analog conversion module;
the humidity sensor is in an IH-3605A type, the voltage model selection range is 0.8-4.0V, and the humidity sensor is electrically connected with the digital-to-analog conversion module;
the digital-to-analog conversion module selects a complete 16-bit sigma-delta converter AD7705 and is electrically connected with the core board;
the GPRS wireless communication module adopts EM310 as a GPRS wireless communication module of the line monitoring terminal, has the functions of multi-path connection and ACK response providing and is electrically connected with the core board;
the serial communication circuit adopts a MAX232 chip, can generate 232 electrical level through MAX232 and is electrically connected with the core board;
the alarm adopts an A7-256 Bi-C-bus type network alarm host, simultaneously supports an RS485 bus and a power supply bus, and is electrically connected with the core board.
3. The on-line monitoring device for the insulators of the power transmission line according to claim 1, characterized in that: the leakage current on-line monitoring device comprises a power supply part, a current acquisition module, a differential amplification module, a low-pass filtering module, a secondary amplification module, an analog-to-digital conversion module, a digital signal processing part, a wireless communication part, a data storage module, a harmonic analysis module and an effective value pulse frequency module;
the power supply part adopts a combination mode of a solar panel and a storage battery, adopts an integrated LM317 with a fixed three-terminal voltage stabilizing circuit to realize voltage conversion, and is electrically connected with the GPRS wireless communication module;
the current acquisition module is electrically connected with the differential amplification module;
the differential amplification module adopts an RC4580 two-way operational amplifier, one end of the operational amplifier is electrically connected with the current acquisition module, and the other end of the operational amplifier is electrically connected with the low-pass filter;
the low-pass filtering module adopts an active second-order filter, the attenuation rate of the stop band can reach-40/decade frequency multiplication, interference signals can be effectively filtered, one end of the low-pass filtering module is electrically connected with the differential amplification module, and the other end of the low-pass filtering module is electrically connected with the secondary amplification module;
the secondary amplification module adopts LM224 to realize double amplification, one end of the secondary amplification module is electrically connected with the low-pass filtering module, and the other end of the secondary amplification module is electrically connected with the analog-to-digital conversion module;
one end of the analog-to-digital conversion module is electrically connected with the secondary amplification module, and the other end of the analog-to-digital conversion module is electrically connected with the digital signal processing part;
the DSP part of the digital signal processing adopts DSP28335, an ADC module in the DSP28335 has 12-bit resolution and is respectively and electrically connected with the effective value pulse frequency module, the analog-to-digital conversion module, the GPRS wireless communication module and the harmonic analysis module;
the GPRS wireless communication module adopts GTM900-C as a GPRS module and is respectively and electrically connected with the digital signal processing DSP part, the data storage module and the power supply part;
the data storage module is electrically connected with the GPRS wireless communication module;
the harmonic analysis module is electrically connected with the digital signal processing DSP part;
and the effective value pulse frequency module is electrically connected with the digital signal processing DSP part.
4. The on-line monitoring device for the insulators of the power transmission line according to claim 1, characterized in that: and the monitoring center comprehensively analyzes the working state of the insulator and is electrically connected with the communication module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022727950.8U CN214041619U (en) | 2020-11-23 | 2020-11-23 | Transmission line insulator on-line monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022727950.8U CN214041619U (en) | 2020-11-23 | 2020-11-23 | Transmission line insulator on-line monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214041619U true CN214041619U (en) | 2021-08-24 |
Family
ID=77361300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022727950.8U Active CN214041619U (en) | 2020-11-23 | 2020-11-23 | Transmission line insulator on-line monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214041619U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115144790A (en) * | 2022-09-02 | 2022-10-04 | 山东理工大学 | High-voltage insulator leakage current online monitoring system and method |
-
2020
- 2020-11-23 CN CN202022727950.8U patent/CN214041619U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115144790A (en) * | 2022-09-02 | 2022-10-04 | 山东理工大学 | High-voltage insulator leakage current online monitoring system and method |
| CN115144790B (en) * | 2022-09-02 | 2022-11-18 | 山东理工大学 | High-voltage insulator leakage current online monitoring system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203759190U (en) | Distribution network cable partial discharge on-line monitoring and discharge position positioning system | |
| CN105910649A (en) | High voltage cable state monitoring system based on direct grounding box and realization method thereof | |
| CN105116273A (en) | Insulator on-line monitoring system | |
| CN205193212U (en) | Insulating detecting system of DC cable | |
| CN103454563A (en) | On-line monitoring system and positioning method for partial discharge in gas insulated switchgear | |
| CN214041619U (en) | Transmission line insulator on-line monitoring device | |
| CN108535546A (en) | Insulator surface conductivity monitoring system and method | |
| CN206497167U (en) | A kind of electric transmission line isolator leakage current monitoring system based on big-dipper satellite | |
| CN117330883B (en) | Overhead line insulator running state monitoring system and method | |
| CN205581259U (en) | GIS local discharge on -line monitoring system with little meteorological monitoring | |
| CN201319008Y (en) | Non-soluble deposit density measurement device for high-voltage transmission line | |
| CN207636665U (en) | A kind of Leakage Current harvester | |
| CN102506909A (en) | 4-20mA special analogue acquisition module | |
| CN203688701U (en) | Transformer sleeve insulation on-line monitoring system | |
| CN105403815A (en) | Insulator live detection system and method based on wireless ad hoc network communication | |
| CN112255517A (en) | Local discharge and temperature combined online monitoring system of switch cabinet | |
| CN202599441U (en) | System for acquiring state data of power transformer | |
| CN209927942U (en) | Intelligent online monitoring instrument for lightning arrester of power transmission line based on wireless communication | |
| CN203929875U (en) | A kind of on-Line Monitor Device that exchanges insulator leakage and corona pulse electric current | |
| CN203705561U (en) | All-weather power-frequency electric field measuring device | |
| CN202869655U (en) | Online temperature monitoring device of high-voltage electrical equipment | |
| CN110376427A (en) | A kind of sub- on-Line Monitor Device of Intelligent insulation and its monitoring method | |
| CN203084093U (en) | Monitor used for lightning arrester | |
| CN202041576U (en) | Wireless DC high-voltage digital microammeter | |
| CN201697712U (en) | Vibration sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |