CN201742158U - Online monitoring device for power transformer - Google Patents
Online monitoring device for power transformer Download PDFInfo
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- CN201742158U CN201742158U CN2010201413282U CN201020141328U CN201742158U CN 201742158 U CN201742158 U CN 201742158U CN 2010201413282 U CN2010201413282 U CN 2010201413282U CN 201020141328 U CN201020141328 U CN 201020141328U CN 201742158 U CN201742158 U CN 201742158U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
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- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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Abstract
The utility model discloses an online monitoring device for a power transformer, which comprises a remote monitoring center, a server and a monitoring terminal which are connected in sequence, wherein the remote monitoring center is used for sending a collection instruction to the server, receiving data returned from the server, analyzing and computing the data, diagnosing the running status of the power transformer and warning faults early, and storing the data in a database; the server is used for sending the collection instruction sent by the remote monitoring center to the monitoring terminal, and transmitting the data sent by the monitoring terminal to the remote monitoring center; the monitoring terminal is used for receiving the collection instruction sent by the server, collecting current signals of an iron core and other information in the running process of the equipment, converting the collected current signals and other information into data, and storing and transmitting the data to the server. The online monitoring device monitors the running status of the power transformer in real time, the monitoring terminal collects and transmits the data to the remote control center, and an expert software of the control center is used for computing on the basis of the online monitored data and diagnosing faults.
Description
Technical field
The utility model belongs to the power equipment monitoring technical field, relates to a kind of monitoring device that is used for power transmission and transforming equipment, is specifically related to a kind of power transformer on-Line Monitor Device.
Background technology
Transformer core is being undertaken the important function of electricity-magnetic-electricity conversion, is one of most important parts of transformer.Transformer is in operation, because of reason such as the iron core stacking technique is not good enough, very easily cause the inter-stage short circuit, and guiding discharge is overheated and the multipoint earthing fault, to damage transformer when serious, because how many sizes of transformer iron core grounding current is with the changing of iron core grounding point, therefore, in the prerun maintenance, both at home and abroad all the characteristic value of iron core grounding current as diagnosis high-power transformer iron core short trouble.At present, the maintenance work of China's power transmission and transforming equipment mainly is regularly to carry out preventive trial according to the requirement of " electrical equipment preventive test rules ", i.e. periodic maintenance (Time Based Maintenance).Periodic maintenance plays a role to the unfailing performance that improves equipment in early days, but exist the test period long, labour intensity big, test validity difference and influence problem such as power supply reliability, the normal voltage of the voltage that the test that particularly has a power failure applies when equipment uses can not in time be found the fault of some latencys.Therefore, state maintenance (Condition Based Maintenance) progressively replaces periodic maintenance to become the inexorable trend of power system device maintenance development.This also is that overhaul of the equipments department is the passive maintenance of groundwork with the abatement apparatus defective, to the equipment scheduled overhaul with transform the main transition of initiatively overhauling as, and then realizes that ordinary maintenance targetedly is main preventative detection.And the precondition that realizes the maintenance of power transformer state is the application of on-line monitoring (status monitoring) Yu the fault diagnosis technology of its state of insulation.The monitoring device that puts into operation in early days adopts distributed structure mostly, and operational effect is undesirable, and the problem that reflects mainly contains:
1) the on-the-spot need laid a large amount of cables, and be great in constructing amount, causes maintenance, expansion inconvenience;
2) adopt the wire transmission pattern, signal transmission distance is long, and analog signal has decay to a certain degree, and can't avoid the various electromagnetic interference in the scene, and in addition, the pattern of wire transmission has brought impassable bottleneck also for the collection and the transmission of strange land signal;
3) for real-time collection and transmission of monitoring data, traditional way for example adopts 485 buses for making up a wire communication network, sends the data acquisition instruction by host computer, each monitoring terminal begins data acquisition after receiving acquisition instructions synchronously then, yet this method synchronism is relatively poor;
4) the exploitation level of monitoring device is lower.For the monitoring iron core grounding current, current sensor plays key effect, and its performance directly influences the certainty of measurement and the reliability of power transformer, for guaranteeing the sampling safety of electric equipment and signal, generally selects the punching structure for use.Because require to have high accuracy, good anti-electromagnetic interference capability and stability for a long time, conventional transducer is difficult to satisfy the standard of practical application;
5) monitoring variable of monitoring device is single.
Summary of the invention
The purpose of this utility model provides a kind of power transformer on-Line Monitor Device, and monitoring good stability, repeatability, precision and reliability height are easy to maintenance, by the GPRS radio communication transfer of data are arrived remote monitoring center, realizes accurately triggering synchronously sampling.
The technical scheme that the utility model adopted is, a kind of power transformer on-Line Monitor Device comprises the remote monitoring center, server and the monitoring terminal that connect successively, wherein,
Remote monitoring center, be used to send acquisition instructions, with this acquisition instructions input server, the data that reception server returns, these data of returning are analyzed and calculated, according to data analysis and result calculated, the running status of power transformer to be diagnosed and fault pre-alarming, the data that the server that receives is returned deposit database in;
Server is used for the acquisition instructions that receiving remote Surveillance center sends, and this acquisition instructions is sent to monitoring terminal, receives the data that monitoring terminal sends, and gives remote monitoring center with this transfer of data;
Monitoring terminal, be used for the acquisition instructions that reception server transmits, according to this acquisition instructions the running status of power transformer is monitored, core current signal and other relevant information in the collecting device running, change current signal and other relevant information of gathering into data, these data are stored, when given time brings, this transfer of data is arrived server.
Characteristics of the present utility model also are,
Monitoring terminal wherein is provided with two or more.
Monitoring terminal wherein comprises microcontroller, and microcontroller is connected with signal conditioning circuit, A/D sample circuit, LCD, keyboard, static random access memory, flash cell, GPRS communication unit, GPS lock unit, top-oil temperature collecting unit, hardware watchdog and power-off restoration circuit respectively; Signal conditioning circuit, A/D sample circuit are connected with programmable amplifying circuit respectively, programmable amplifying circuit is connected with signal selecting circuit, and signal selecting circuit is connected with core current signal acquisition circuit, short-circuit reactance measuring circuit and power frequency component generation circuit respectively.
Microcontroller wherein comprises processor, being connected with respectively on the processor disappears trembles logic module, sampling logic module and frequency measurement logic module, and processor is connected with LCD, static random access memory, flash cell, GPRS communication unit, GPS lock unit, top-oil temperature collecting unit, hardware watchdog and power-off restoration circuit respectively; Disappear and tremble logic module and be connected with keyboard; The sampling logic module is connected with the A/D sample circuit; The frequency measurement logic module is connected with signal conditioning circuit.
The utility model monitoring device compared with prior art has following advantage:
1) adopt the DS18b20 temperature sensor to realize the on-line monitoring of power transformer top-oil temperature, realize the on-line monitoring of short-circuit of power transformer reactance, core current making the power transformer on-Line Monitor Device have better integrality based on hardware circuit design and BCT-2 type high accuracy electromagnetic type punching small electric current sensor;
2) at field working conditions, can select to adopt the GPRS wireless communication technology to carry out transfer of data and control, the cable construction of having avoided the conventional data transmission mode to bring greatly reduces the difficulty of construction and installs installation cost; The device installation of not only can having installed continuously but also can disperse; The device expansion is very flexible, can articulate new monitoring means easily;
3) adopt the GPS technology to carry out the monitoring terminal synchronized sampling, improved the synchronized sampling precision, help the horizontal and vertical comparison and the accident analysis of monitored equipment;
4) equipment under test is realized remote monitoring, client is non-maintaining, makes the distribution of device concentrated relatively, helps the maintenance of device, has extensibility and flexibility preferably.
Description of drawings
Fig. 1 is the structural representation of the utility model monitoring device;
Fig. 2 is the structural representation of monitoring terminal in the utility model monitoring device;
Fig. 3 is the terminal schematic diagram of monitoring terminal in the utility model monitoring device;
Fig. 4 is that microcontroller is gathered in real time and the flow chart of deal with data in the utility model monitoring device;
Fig. 5 be in the utility model monitoring device the frequency measurement logic module to the detection equivalent schematic diagram of core current signal.
Among the figure, 1. remote monitoring center, 2. server, 3. monitoring terminal, 4. microcontroller, tremble logic module 4-1. disappear, 4-2. processor, the 4-3. logic module of sampling, 4-4. frequency measurement logic module, 5. signal conditioning circuit, 6. core current signal acquisition circuit, 7. signal selecting circuit, 8. programmable amplifying circuit, 9.A/D sample circuit, 10. LCD, 11. keyboards, 12. static random access memorys, 13. flash cell, 14.GPRS communication unit, 15.GPS lock unit, 16. top-oil temperature collecting units, 17. hardware watchdog, 18. power frequency component generation circuit, 19. power-off restoration circuit, 20. short-circuit reactance measuring circuits.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
The structure of the utility model monitoring device, as shown in Figure 1.Comprise the remote monitoring center 1, server 2 and a plurality of monitoring terminal 3 that connect successively, the structure of monitoring terminal 3, as shown in Figure 2, comprise microcontroller 4, microcontroller 4 is connected with signal conditioning circuit 5, A/D sample circuit 9, LCD 10, keyboard 11, static random access memory 12, flash cell 13, GPRS communication unit 14, GPS lock unit 15, top-oil temperature collecting unit 16, hardware watchdog 17 and power-off restoration circuit 19 respectively; Signal conditioning circuit 5 is connected with programmable amplifying circuit 8 respectively with A/D sample circuit 9, programmable amplifying circuit 8 is connected with signal selecting circuit 7, and signal selecting circuit 7 is connected with core current signal acquisition circuit 6, short-circuit reactance measuring circuit 20 and power frequency component generation circuit 18 respectively.Microcontroller 4 comprises processor 4-2, and being connected with respectively on the processor 4-2 disappears trembles logic module 4-1, sampling logic module 4-3 and frequency measurement logic module 4-4.Processor 4-2 in the microcontroller 4 is connected with LCD 10, static random access memory 12, flash cell 13, GPRS communication unit 14, GPS lock unit 15, top-oil temperature collecting unit 16, hardware watchdog 17 and power-off restoration circuit 19 respectively; Disappear and tremble logic module 4-1 and be connected with keyboard 11; Sampling logic module 4-3 is connected with A/D sample circuit 9; Frequency measurement logic module 4-4 is connected with signal conditioning circuit 5.
Server 2 is used for the acquisition instructions that receiving remote Surveillance center 1 sends, and this acquisition instructions is sent to monitoring terminal 3, receives the data that monitoring terminal 3 sends, and gives remote monitoring center 1 with this transfer of data;
(1) microcontroller 4
(2) the core current signal acquisition circuit 6
Core current signal acquisition circuit 6 comprises: the active punching structure of the BCT-2 type electromagnetic type small electric current sensor based on zero magnetic flux technology, channel switching circuit based on relay, the core current signal is converted to the voltage signal that the absolute value amplitude is not higher than 10V by transducer and provides input for A/D sample circuit 9.
The BCT-2 type electromagnetic type punching small electric current sensor that core current signal acquisition circuit 6 adopts based on active zero magnetic flux technology is used for the collection of core current signal.In the converting station high voltage electrical apparatus insulation line monitoring device, for the monitoring power transformer, current sensor plays key effect, its performance is directly connected to the precision and the reliability of capacitive apparatus medium loss measurement, in order to guarantee the sampling safety of electric equipment earth current signal, transducer is generally selected the punching structure for use.The scope of transformer core current is at tens milliamperes to several amperes, and traditional passive sensor can't guarantee its precision and stability, be difficult to satisfy on-the-spot application requirements, and be to improve the preferred approach of little current detection accuracy and adopt active zero magnetic flux technology.BCT-2 type electromagnetic type punching small electric current sensor adopts the initial permeability height, and the little permalloy of loss is done iron core, and has adopted unique degree of depth negative-feedback technology, can automatically compensate iron core, makes iron core be operated in desirable zero magnetic flux state.The punching structure Design more can guarantee the safety (30 millimeters in aperture) of equipment, and long-term the use shows that this transducer can accurately detect the power current of 100 μ A～700mA.The phse conversion error is not more than 0.01 °, and without any need for proofreading and correct and revising, all devices is the same, and interchangeability is extremely strong, and has fabulous temperature characterisitic and interference of electromagnetic field ability, the accuracy of the equipment sampling under disturb at satisfied fully complicated scene, power station.
(3) the GPS lock unit 15
GPS lock unit 15 is selected the M12+Timing of Motorola (Motorola) time service module for use, and this time service module has 12 passages, can follow the tracks of 12 satellites simultaneously, can produce the synchronous time service up to nanosecond.Adopt gps satellite based on GMT(Greenwich Mean Time) the global synchronization time signal of Greenwich mean time and the motor synchronizing pulse per second (PPS) that GPS time service module has, can produce precision higher synchronous edge, the synchronous error precision can reach 2ns, therefore can adopt GPS to trigger, finish data acquisition, guaranteed the synchronism in sampling time, guaranteed validity and the reliability measured, for microprocessor provides fiducial time and synchronous pulse per second (PPS) 1PPS.
(4) the GPRS communication unit 14
GPRS communication unit 14 adopts H7118 GPRS DTU module, and this module is supported double frequency GSM/GPRS, meets ETSI GSM Phase 2+ standard, and data terminal is always online, supports A5/1﹠amp; A5/5 cryptographic algorithm, transparent data transmission and protocol conversion, virtual support data private network, short message data alternate channel (option), support dynamic data center domain name and IP address, support RS-232/422/485 or Ethernet interface, can carry out software upgrading by Xmodem Protocol, possess self diagnosis, alarm output and Anti-interference Design, be fit to the abominable application demand of electromagnetic environment, this module adopts advanced power technology, power supply accommodation is wide, the stability of raising equipment, the apolegamy moisture-proof case is fit to outdoor utility.Can directly be connected, realize the GPRS function that dials up on the telephone, and its stable performance, can satisfy the needs of this monitoring device with monitoring terminal 3.
(5) the A/D sample circuit 9
A/D sample circuit 9 is selected the ADS8505 chip of TI company for use, and this chip is high performance SAR type A/D converter.Its inner capacitance matrix mode that adopts CMOS technology, power consumption is lower, and volume is less.A/D converter inside is provided with sampling holder usually, and this sampling holder can be kept sampled voltage up to EOC, and its switching rate is very fast.The ADS8505 chip has 16 bit resolutions, and sampling rate can reach 250KHz, and parallel 16 bit data output is fit to 8 and 16 bit data bus, adopts single 5V power supply power supply, and the standard input signal scope can reach positive and negative 10V, and overall power only is 70mW.
This monitoring device need be controlled A/D converter, finishes synchronous high-speed integral multiple signals sampling and to the measurement of power frequency component frequency.Conventional method adopts CPU or single-chip microcomputer to finish controlling of sampling to A/D converter more, and its advantage is that programming is simple, control flexibly, but that shortcoming is a control cycle is long, speed is slow.For example MCS-51 series monolithic maximum clock frequency only is 12MHz, when the sample rate of A/D converter itself when very fast, the work schedule at a slow speed of CPU or single-chip microcomputer has greatly limited the high speed performance of A/D converter.And the clock frequency of FPGA can reach more than the 100MHz, can control A/D converter flexibly and carry out high-speed sampling, and sampled data be deposited in real time in the high-speed RAM of FPGA inside.
(6) filter circuit
The filter circuit that comprises in the signal conditioning circuit 5 is a low-pass filter circuit, and the signal that signal acquisition circuit collects is through low-pass filtering treatment, and its harmonic components of filtering just can be input to the frequency measurement logical leading end.
(7) frequency measurement logic module 4-4 and sampling logic module 4-3
By frequency measurement logic module 4-4 and sampling logic module 4-3, realize the measurement of power-frequency voltage frequency and the real-time sampling control of A/D conversion chip ADS8505, finish the functions such as buffering, processing, transmission of data.The equivalent schematic diagram that frequency measurement logic module 4-4 detects leakage current signal, as shown in Figure 5, freq_in is the square wave input of sine voltage signal after the external analog circuitry shaping of current sensor output, its frequency equals the power network signal frequency, clk is the global clock of FPGA, measure_en is the frequency measurement Enable Pin, needing the seasonal measure_en of the frequency measurement frequency measurement of current sensor output signal (when the comprising to) for high to the frequency measurement of self-check of device signal and operate as normal, its frequency is counted count value measure_value[31..0 by counter module hmfreq] will export to microprocessor Nios II and calculate and convert correspondent frequency then to.For example: if the FPGA use is the crystal oscillator of 20M, then its global clock clk cycle is 1/20 μ s, and the freq_in input is the power frequency component of standard 50Hz frequency (cycle is 1/50s), 32 bit register measure_value[31..0 then] counting be output as 1/50s ÷ 1/20 μ s=40 0000, otherwise, so also can in like manner converse the frequency of freq_in by the worthwhile of measure_value, thereby realize frequency measurement.In A/D controlling of sampling module, soft nuclear microprocessor Nios II receives after host computer sends to acquisition on the GPRS, if the timing acquiring order then need be read the time of GPS, Nios II enables acquisition module (sample_enable puts height) after reading the set time, just puts high sample_enable immediately if real-time acquisition then need not to wait for the given time of GPS.Acquisition module ad_data_ram begins to wait for the synchronous pulse per second (PPS) 1PPS of GPS after sample_enable puts height, the triggering sign that begins to sample as power frequency component to one-period, acquisition module is immediately according to the given sampling rate samplerate_divdata[12..0 of microprocessor] power network signal is carried out 500 point samplings, the count value of sampling rate=signal frequency/500, be measure_value/500, its representative be the sampling interval of each neighbouring sample point in the power frequency period.The corresponding sampling process of PPS, the one-period of the corresponding power frequency component of each gatherer process, each sampled value occupies 2 bytes, the controlling of sampling module all is stored in 500 sampled values in the internal RAM of ad_data_ram, and send the sampling signal finished that finishes to microprocessor in the 500th the point sampling back that finishes, and simultaneously successively from ram_datatest[15..0] output is stored in the sampled value of 500 points the internal RAM.
(8) the top-oil temperature collecting unit 16
The top-oil temperature collecting unit is selected the DS18b20 Temperature Humidity Sensor for use, and it is the digital temperature sensor of one-wire interface.Single power supply, supply district are 3V ~ 5.5V, and temperature-measuring range is-55 ℃ ~ 125 ℃, and when temperature was-10 ℃ ~ 85 ℃, precision was ± 0.5 ℃, can satisfy the monitoring requirement of top-oil temperature.
(9) power-off restoration circuit 19 adopts the CD6040BE timer chip, every 22 hours FPGA is carried out power-off restoration 1 time.
(10) short-circuit reactance measuring circuit 20 by one as reference voltage+resistance and the channel switching circuit based on relay that the power supply of 10V, high accuracy resistance are 500 Ω form.
(11) hardware watchdog 17 adopts the CAT1832 chip, microcontroller 4 surpasses the pulse signal of 20ns incessantly to hardware watchdog 17 output low level width in 500ms, otherwise in case surpass 500ms at interval, hardware watchdog 17 feeds back to reseting pulse signal of FPGA.
The workflow of the utility model monitoring device:
Monitoring terminal 3 is mainly finished the tasks such as sampling logic control, data preliminary treatment, grid frequency measurement, Control on Communication and liquid crystal display control of core current data.Monitoring terminal 3 obtains the core current signal through current sensor, this signal and short-circuit reactance measuring circuit output voltage, power frequency component generation circuit output signal are sent into programmable amplifying circuit 8 behind signal selecting circuit, programmable amplifying circuit 8 adopts PGA204, the voltage signal that receives is carried out program control amplification, voltage signal after the amplification is sent into filter circuit, filter circuit adopts UAF42U, after filter circuit carries out bandpass filtering to the received signal, be delivered to frequency measurement logic module 4-4, frequency measurement logic module 4-4 calculates the frequency that receives signal; Monitoring terminal 3 has been set up perfect communication mechanism with monitoring host computer, and self adaptation GPRS/RS485 communication pattern is realized the stabilized communication of a plurality of monitoring terminals 3 and host computer; Simultaneously, monitoring terminal 3 also can be controlled LCD 10 and provide friendly interactive interface for the user, and realizes operations such as manual self check, real-time sampling.
The electric equipment state simulation amount that core current signal acquisition circuit 6, short-circuit reactance measuring circuit 20 and power frequency component generation circuit 18 obtain, after programmable amplifying circuit 8 amplified, be divided into two-way: the one tunnel sent into the frequency measurement that frequency measurement logic module 4-4 finishes signal; Another route A/D sample circuit 9 is converted to digital quantity, sends in the microcontroller 4, and 4-2 handles through Nios II data processor, is transferred on the computer workstation in the master-control room with the GPRS/RS485 transmission means by communication module.Monitoring terminal 3 is when self-checking function is activated, and signal selection module switches to the power frequency component generator, and processor 4-2 carries out frequency measurement and sampling to this signal, to finish power-on self-test.Realize precise synchronization by Motorola M12+GPS between each monitoring terminal 3.
The utility model monitoring device adopts the FPGA (Field Programmable Gate Array) technology, is main hardware carrier with FPGA, the work frequency of finishing front end detects and the sampling of high-speed synchronous integral multiple, with the control core of microprocessor 4, the course of work of device is controlled, and finished communication function as device.On the basis of hardware structure, drafted the acquisition scheme that sample rate can the auto-tracking power frequency frequency.Running status that can the on-line real time monitoring power transformer, monitoring terminal is finished data acquisition and is transferred to far-end control centre, is calculated based on online monitoring data and is carried out fault judgement by the expert software of control centre.
Claims (4)
1. a power transformer on-Line Monitor Device is characterized in that, comprises the remote monitoring center (1), server (2) and the monitoring terminal (3) that connect successively, wherein,
Remote monitoring center (1), be used to send acquisition instructions, with this acquisition instructions input server (2), the data that reception server (2) returns, these data of returning are analyzed and calculated, according to data analysis and result calculated, the running status of power transformer to be diagnosed and fault pre-alarming, the data that the server (2) that receives is returned deposit database in;
Server (2) is used for the acquisition instructions that receiving remote Surveillance center (1) sends, and this acquisition instructions is sent to monitoring terminal (3), receives the data that monitoring terminal (3) sends, and gives remote monitoring center (1) with this transfer of data;
Monitoring terminal (3), be used for the acquisition instructions that reception server (2) transmits, according to this acquisition instructions the running status of power transformer is monitored, core current signal and other relevant information in the collecting device running, change current signal and other relevant information of gathering into data, these data are stored, when given time brings, this transfer of data is arrived server (2).
2. power transformer on-Line Monitor Device according to claim 1 is characterized in that, described monitoring terminal (3) is provided with more than two.
3. power transformer on-Line Monitor Device according to claim 1 and 2, it is characterized in that, described monitoring terminal (3) comprises microcontroller (4), and microcontroller (4) is connected with signal conditioning circuit (5), A/D sample circuit (9), LCD (10), keyboard (11), static random access memory (12), flash cell (13), GPRS communication unit (14), GPS lock unit (15), top-oil temperature collecting unit (16), hardware watchdog (17) and power-off restoration circuit (19) respectively; Described signal conditioning circuit (5), A/D sample circuit (9) are connected with programmable amplifying circuit (8) respectively, programmable amplifying circuit (8) is connected with signal selecting circuit (7), and described signal selecting circuit (7) is connected with core current signal acquisition circuit (6), short-circuit reactance measuring circuit (20) and power frequency component generation circuit (18) respectively.
4. power transformer on-Line Monitor Device according to claim 3, it is characterized in that, described microcontroller (4) comprises processor (4-2), being connected with respectively on the processor (4-2) disappears trembles logic module (4-1), sampling logic module (4-3) and frequency measurement logic module (4-4), processor (4-2) respectively with LCD (10), static random access memory (12), flash cell (13), GPRS communication unit (14), GPS lock unit (15), top-oil temperature collecting unit (16), hardware watchdog (17) is connected with power-off restoration circuit (19); Described disappearing trembled logic module (4-1) and is connected with keyboard (11); Described sampling logic module (4-3) is connected with A/D sample circuit (9); Described frequency measurement logic module (4-4) is connected with signal conditioning circuit (5).
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| CN2010201413282U CN201742158U (en) | 2010-03-26 | 2010-03-26 | Online monitoring device for power transformer |
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| CN2010201413282U CN201742158U (en) | 2010-03-26 | 2010-03-26 | Online monitoring device for power transformer |
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| CN201742158U true CN201742158U (en) | 2011-02-09 |
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105425768A (en) * | 2015-11-06 | 2016-03-23 | 国网山东莒县供电公司 | Electric power secondary equipment monitoring device and method |
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| CN106469328A (en) * | 2016-08-31 | 2017-03-01 | 四川创能电力工程有限公司 | A kind of intelligent management system and approaches to IM |
| CN106680663A (en) * | 2016-11-18 | 2017-05-17 | 云南电网有限责任公司电力科学研究院 | Online detection method and system for multi-branch power distribution network transformer |
| CN109245864A (en) * | 2018-11-27 | 2019-01-18 | 威海威高生物科技有限公司 | ETH-CAN communication front-end detection device and wrong self checking method based on self feed back |
| CN109245864B (en) * | 2018-11-27 | 2023-09-19 | 威海威高生物科技有限公司 | ETH-CAN communication front-end detection device based on self-feedback and error self-detection method |
| CN109712382A (en) * | 2019-02-01 | 2019-05-03 | 智慧盈通（北京）工业技术有限公司 | A kind of environment monitoring data acquisition Transmission system |
| CN110018328A (en) * | 2019-05-07 | 2019-07-16 | 北京中瑞和电气有限公司 | A kind of power transformer on-Line Monitor Device and method based on transient state oil stream feature |
| CN110018328B (en) * | 2019-05-07 | 2024-03-26 | 北京中瑞和电气有限公司 | Power transformer on-line monitoring device and method based on transient oil flow characteristics |
| CN111913147A (en) * | 2020-08-05 | 2020-11-10 | 国网甘肃省电力公司营销服务中心 | Monitoring method and device of power metering device based on Internet of things, server and storage medium |
| CN111964726A (en) * | 2020-08-27 | 2020-11-20 | 柳州市自动化科学研究所 | System for collecting and monitoring operating parameters of transformer |
| CN114325495A (en) * | 2021-12-20 | 2022-04-12 | 山东汇能电气有限公司 | Operation protection method for distribution transformer based on loss comparison |
| CN114325495B (en) * | 2021-12-20 | 2022-09-13 | 山东汇能电气有限公司 | Operation protection method for distribution transformer based on loss comparison |
| CN115549314A (en) * | 2022-11-24 | 2022-12-30 | 江苏安世朗智能科技有限公司 | Dry-type transformer fault remote early warning system based on Internet of things |
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