CN102638096A - Wireless monitoring system based on General Packet Radio Service (GPRS) for distributing transformer - Google Patents
Wireless monitoring system based on General Packet Radio Service (GPRS) for distributing transformer Download PDFInfo
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- CN102638096A CN102638096A CN2012100761249A CN201210076124A CN102638096A CN 102638096 A CN102638096 A CN 102638096A CN 2012100761249 A CN2012100761249 A CN 2012100761249A CN 201210076124 A CN201210076124 A CN 201210076124A CN 102638096 A CN102638096 A CN 102638096A
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- 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
- Y04S40/12—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
- 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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- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- 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
- Y04S40/12—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
- Y04S40/128—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 involving the use of Internet protocol
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Abstract
The invention discloses a wireless monitoring system based on General Packet Radio Service (GPRS) for a distributing transformer. The wireless monitoring system comprises a voltage and current sampling module (1), an object control switch group (2), an analog-to-digital converting module (3), a middle relay group (4), a Central Processing Unit (CPU) processing module (5), an input and output module (6), a wireless communication module (7), a panel operating system (8), a remote server (9) and a Web monitoring interface (10). The wireless monitoring system based on GPRS for the distributing transformer designed according to the invention can configure parameters for different operation modes according to the change of loads in different areas and at different periods of time, thus converting the operating way of a transformer on the spot automatically.
Description
Technical field
The present invention relates to distribution transformer wireless supervisory control system, particularly Transformer Economic operation wireless supervisory control system in the electrical network based on GPRS.
Background technology
[0002] transformer is as a visual plant of power department, in general from generating, power supply, electricity consumption, and be through 3 to 5 transformation processes.Transformer will produce active loss and reactive loss in this process, and accounts for about 30% of whole power consumption.In order to reduce the power transformer loss, improve operational reliability, GB/T13462 " industrial and mining enterprises' economic operation of power transformer guide rule " national Specification the requirement of selection, calculating and management of economic operation of power transformer mode.Economic operation of power transformer is meant in the Technological Economy permission, guarantees under the condition of safety in production, loads, improves service conditions through preferential operational mode, adjustment rationally, and transformer is moved under the low state of electric energy loss.
At present, making big quantity research aspect the power transformer power-saving technology both at home and abroad.Its basic skills mainly is to utilize account form and analysis software right selection transformer capacity and platform number, promotes the use of high-effect low-loss transformer, improves power factor etc.Also relate to the preferred of operational mode for two or many transformers; Most of mode that adopts then is to pass budgets, measure the reasonable way of economic operation that payload decides transformer; Lean on manpower regularly to go to the scene to carry out the conversion of transformer running status then, reach the purpose that reduces transformer loss.
The shortcoming of doing like this is: with regard to the present situation of domestic distribution network systems; The power load in zones of different, different times all can be distinct; Situation such as peak of power consumption, low ebb phase also all can appear at the same area in one day 24 hours just; Cause the transformer switching scheme of formulating budget before putting into operation complicated more, practical operation is got up very difficult.Most of distribution transformer infield complicacy, dispersion, quantity be many, leave control centre apart from distant; Cause networking, communication difficulties, real-time running data is difficult to obtain, and the staff needs regularly to make again that to the collection in worksite data data have limitation; On-the-spot data can not in time be reported to the designer; The designer can not understand on-the-spot payload fluctuation situation in real time, and the data of measuring some discrete points are used for analyzing, design so only depend on, its practicality, poor accuracy; Not only cause the loss of a large amount of manpower and materials, also can have a strong impact on the effect of transformer economic operation design.
In recent years, China's mobile communications industry has obtained great development.Based on the value-added service of wireless new technology quietly changing the city looks, changing the people's life style.Wireless new technology is used and has not only been beautified the city, increased life modern sense but also can improve the investment climate, increase fail safe, for we bring huge social, economic benefit.Adopt the wireless monitoring management system of advanced GPRS technology; Integrate multiple advanced technologies such as computer, communication, electromechanics, automatic control, successfully realized, solved traditional control owing to there is not communication function to the Real-time Monitor Management of wireless distribution system and deployment flexibly; Can't realize the problem of centralized monitor; The operation maintenance personnel are freed from a large amount of loaded down with trivial details work, improve the running quality of wireless system, strengthen wireless reliability and controllability; Can in time find to locate the wireless system fault, significantly reduce the harmful effect that system stops using and brings.
Summary of the invention
The object of the present invention is to provide a kind of can be according to the variation of zones of different, load of different period; Dispose parameter under the different operational modes; Automatically on-the-spot transformer operational mode is changed the distribution transformer wireless supervisory control system that every transformer can both be moved in the economical operation district based on GPRS.
The present invention adopts following technical scheme for solving the problems of the technologies described above: the present invention has designed the distribution transformer wireless supervisory control system based on GPRS; Comprise electric current and voltage sampling module (1), object control switch group (2), analog-to-digital conversion module (3), auxiliary relay group (4), CPU processing module (5), input/output module (6), wireless communication module (7), panel operation system (8), remote server (9) and Web monitoring interface (10), wherein:
Said electric current and voltage sampling module (1) is connected to electrical network will gather and produce the change amount of sending data to the voltage and the current signal of load; Its output is connected to analog-to-digital conversion module (3) input, delivers to analog-to-digital conversion module (3) to the change amount of sending data and carries out analog to digital conversion and become digital quantity;
Said analog-to-digital conversion module (3) output connects the cpu logic controller, is sent to the cpu logic controller to the data after the conversion and carries out logical process;
Message transmission to remote server (9) after said CPU processing module (5) will be handled through wireless communication module (7), and be presented on the Web monitoring interface (10);
Said CPU processing module (5) control input/output module (6) the middle panel signal of counter plate operating system (8) is respectively gathered and middle relay group (4) is regulated and control, and carries out the switching operation of transformer through the said object switches set of auxiliary relay group (4) control.
As a kind of optimizing structure of the present invention: said object control switch group (2) is made up of ten killer switch groups, is respectively 1QF, 2QF, 3QF, 4QF, 5QF, 6QF, 7QF, 8QF, 9QF and 10QF, wherein:
4QF is connected in series in the high voltage input terminal of A section transformer, and 1QF is connected in series in the low-voltage output of A section transformer;
5QF is connected in series in the high voltage input terminal of B section transformer, and 2QF is connected in series in the low-voltage output of B section transformer;
6QF, 7QF and 8QF are connected in series in the high voltage input terminal of C section transformer, and 3QF is connected in series in the low-voltage output of C section transformer;
9QF connects the low-voltage output of A section transformer and B section transformer, and 10QF connects the low-voltage output of B section transformer and C section transformer.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1. the present invention designed based on the distribution transformer wireless supervisory control system of GPRS owing to adopted the GPRS wireless mode to land remote server (9); Can carry out wireless monitor to on-the-spot transformer running status in real time, overcome the defective that present economic operation of power transformer remote monitoring is not easy to reach optimum efficiency;
2. the parameter of distribution network systems operation can be measured, monitored to the distribution transformer wireless supervisory control system based on GPRS that the present invention designed in real time; And when the transformer service conditions meets switch condition; Be automatically converted to operational mode economically and reasonably according to certain logic, latching relation, make transformer operate in optimum economic scene, reduce the transformer loss saves energy; Prolong transformer life, reduce and become distribution cost;
3. the distribution transformer wireless supervisory control system based on GPRS that the present invention designed carries out remote monitoring to on-the-spot transformer running status in real time through Web monitoring interface (10), gathers service data in real time, realizes the concentrated allotment of transformer;
4. the distribution transformer wireless supervisory control system based on GPRS that the present invention designed is flexible for installation, easy to use, circuit simple, be convenient to later maintenance, is suitable for newly-built power matching network and old electric network reconstruction.
Description of drawings
Fig. 1 is the distribution transformer wireless supervisory control system block diagram based on GPRS that the present invention designs;
Fig. 2 is a Be Controlled object switches set schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is done further detailed description:
As shown in Figure 1; The present invention has designed the distribution transformer wireless supervisory control system based on GPRS; Comprise electric current and voltage sampling module (1), object control switch group (2), analog-to-digital conversion module (3), auxiliary relay group (4), CPU processing module (5), input/output module (6), wireless communication module (7), panel operation system (8), remote server (9) and Web monitoring interface (10), wherein:
Electric current and voltage sampling module (1) is gathered the electric current and voltage data of electrical network primary side respectively, and is transformed into 0-10V, the 0-20mA data change amount of sending; Analog-to-digital conversion module (3) carries out analog to digital conversion and becomes digital quantity, and deliver to the cpu data processing unit 0-10V, the 0-20mA change amount of sending data;
CPU processing module (5) is calculated parameters of electric power such as three-phase average current, active power, reactive power, apparent power, power factor to the electric current after changing, the digital quantity of voltage; And result of calculation is deposited with in the buffer; CPU processing module (5) is carried out computing, comparison, judgement according to the systemic presupposition value to the collection in worksite amount, and the control transformer automatic switching is to economic operation model then;
Auxiliary relay group (4) enlarges the control capacity of CPU processing module (5) output contact, and signal directly goes controlling object control switch group (2) action through the coil of auxiliary relay group (4) by the contact of auxiliary relay group (4);
CPU processing module (5) uses the GPRS pattern to land remote server (9) through wireless communication module (7); Adopt Web monitoring interface (10) access remote servers (9) that the running status of on-the-spot transformer is monitored; In concrete embodiment; Remote server (9) needs to install KingView software, inserts wireless router.The monitoring interface of design system operation in KingView software adds virtual serial port and carries out GPRS with wireless module and communicate by letter through wireless route mapped port is long-range, and dispose the domain name of Web monitoring interface (10), so that remote access.
As shown in Figure 2; Object control switch group (2) among the present invention is according to the variation of load; Adjust the operation of two or many transformers; Every transformer can both be moved in the economical operation district; Said object control switch group (2) is changed the transformer operational mode according to measuring calculated value automatically: separate unit is shared, and------separate unit is shared for three fanout operations---two fanout operations---, breaks off another transformer one side power supply when separate unit is shared, reaches the purpose that reduces transformer noload losses and load loss for two fanout operations.Be main transformer with one at first, two is to be equipped with to become in addition, is equipped with change switching operation in turn according to running status after operation a period of time, guarantees that every transformer can balanced use.
To three transformer partition runnings of single busbar connection structure, operational mode has four kinds:
1.C the shared operation of section transformer separate unit, through switch 3QF, 6QF, 9QF, 10QF are to all load power supplies;
2.A, C section transformer fanout operation, through switch 1QF, 4QF, 3QF, 6QF, 9QF is to the power supply of separately load;
3.B, C section transformer fanout operation, through switch 2QF, 5QF, 3QF, 6QF, 9QF is to the power supply of separately load;
4.A, B, C section transformer fanout operation, through switch 1QF, 4QF, 2QF, 5QF, 3QF, 6QF are to separately load power supply.
The present invention at first with a transformer for commonly used, two are moved for subsequent use mode in addition, are the operation that guarantees that three transformers can equilibrium, system begins from putting into operation to monitor in real time, when running status reached the setting pattern, former spare transformer carried out automatic switching.
The conversion of A, B, C section transformer operational mode is undertaken by following logical order:
The shared operation of C section transformer separate unit transfers A or B, C section transformer fanout operation to;
During the shared operation of C section transformer separate unit, 3QF, 6QF, 9QF, 10QF are closed, and 1QF, 2QF, 4QF, 5QF break off; Turn to all load power supplies of A or B, C section transformer by C section transformer, it is A, C section that the number of times through historical A, B switching decides, or B, C section transformer fanout operation.The operation of C section transformer turns to A, the operation of C section transformer to all load power supplies, and this moment, B section transformer was in halted state.After load rises, transfer A, C section transformer fanout operation to, closed 1QF, 4QF; Break off 10QF; 1QF, 3QF, 4QF, 6QF, 9QF are in the close position at this moment, and 2QF, 5QF, 10QF are in open position, and A, C section transformer are supplied power to load separately respectively.In like manner, the operation of C section transformer turns to B, the operation of C section transformer to all load power supplies, and this moment, A section transformer was in halted state.After load rises, transfer B, C section transformer fanout operation to, closed 2QF, 5QF; Break off 10QF; 2QF, 3QF, 5QF, 6QF, 9QF are in the close position at this moment, and 1QF, 4QF, 10QF are in open position, and B, C section transformer are supplied power to load separately respectively.
A or B, C section transformer fanout operation transfer A, B, C section transformer fanout operation to:
When A, C section transformer fanout operation, 1QF, 3QF, 4QF, 6QF, 9QF closure, 2QF, 5QF, 10QF break off; A, the operation of C section transformer turn to A, B, the operation of C section transformer to all load power supplies, and A, B, C section transformer all are in running status at this moment.After load rises, transfer A, B, C section transformer fanout operation to, closed 2QF, 5QF; Break off 9QF, 10QF; 1QF, 2QF, 3QF, 4QF, 5QF are in the close position at this moment, and 9QF, 10QF are in open position, and A, B, C section transformer are supplied power to load separately respectively.In like manner, when B, C section transformer fanout operation, 2QF, 3QF, 5QF, 6QF, 9QF closure, 1QF, 4QF, 10QF break off; B, the operation of C section transformer turn to A, B, the operation of C section transformer to all load power supplies, and A, B, C section transformer all are in running status at this moment.After load rises, transfer A, B, C section transformer fanout operation to, closed 1QF, 4QF; Break off 9QF, 10QF; 1QF, 2QF, 3QF, 4QF, 5QF are in the close position at this moment, and 9QF, 10QF are in open position, and A, B, C section transformer are supplied power to load separately respectively.
A, B, C section transformer fanout operation transfer A or B, C section transformer fanout operation to;
When A, B, C section transformer fanout operation, 1QF, 2QF, 4QF, 5QF, 3QF, 6QF closure, 9QF, 10QF break off; Turn to all load power supplies of A or B, C section transformer by A, B, C section transformer fanout operation, it is A, C section that the number of times through historical A, B switching decides, or B, C section transformer fanout operation.A, B, C section transformer fanout operation turn to A, the operation of C section transformer to all load power supplies, and this moment, B section transformer was in halted state.After load descends, transfer A, C section transformer fanout operation to, closed 9QF; Break off 2QF, 5QF; 1QF, 3QF, 4QF, 6QF, 9QF are in the close position at this moment, and 2QF, 5QF, 10QF are in open position, and A, C section transformer are supplied power to load separately respectively.In like manner, A, B, C section transformer fanout operation turn to B, the operation of C section transformer to all load power supplies, and this moment, A section transformer was in halted state.After load descends, transfer B, C section transformer fanout operation to, closed 9QF; Break off 1QF, 4QF; 2QF, 3QF, 5QF, 6QF, 9QF are in the close position at this moment, and 1QF, 4QF, 10QF are in open position, and B, C section transformer are supplied power to load separately respectively.
A or B, C section transformer fanout operation transfer the shared operation of C section transformer separate unit to:
When A, C section transformer fanout operation, 1QF, 3QF, 4QF, 6QF, 9QF closure, 2QF, 5QF, 10QF break off; A, the operation of C section transformer turn to C section transformer to move to all load power supplies, and this moment, C section transformer all was in only state of operation.After load descends, transfer the shared operation of C section transformer separate unit to, closed 10QF; Break off 1QF, 4QF; 3QF, 6QF, 9QF, 10QF are in the close position at this moment, and 1QF, 2QF, 4QF, 5QF are in open position, and the shared operation of C section transformer separate unit is to all load power supplies.In like manner, when B, C section transformer fanout operation, 2QF, 3QF, 5QF, 6QF, 9QF closure, 1QF, 4QF, 10QF break off; B, the operation of C section transformer turn to C section transformer to move to all load power supplies, and this moment, C section transformer all was in only state of operation.After load descends, transfer the shared operation of C section transformer separate unit to, closed 10QF; Break off 2QF, 5QF; 3QF, 6QF, 9QF, 10QF are in the close position at this moment, and 1QF, 2QF, 4QF, 5QF are in open position, and the shared operation of C section transformer separate unit is to all load power supplies.
Claims (2)
1. based on the distribution transformer wireless supervisory control system of GPRS; Comprise electric current and voltage sampling module (1), object control switch group (2), analog-to-digital conversion module (3), auxiliary relay group (4), CPU processing module (5), input/output module (6), wireless communication module (7), panel operation system (8), remote server (9) and Web monitoring interface (10), it is characterized in that:
Said electric current and voltage sampling module (1) is connected to electrical network will gather and produce the change amount of sending data to the voltage and the current signal of load; Its output is connected to analog-to-digital conversion module (3) input, delivers to analog-to-digital conversion module (3) to the change amount of sending data and carries out analog to digital conversion and become digital quantity;
Said analog-to-digital conversion module (3) output connects the cpu logic controller, is sent to the cpu logic controller to the data after the conversion and carries out logical process;
Message transmission after said CPU processing module (5) will be handled through wireless communication module (7) is to remote server, and is presented on the Web monitoring interface (10);
Said CPU processing module (5) control input/output module (6) the middle panel signal of counter plate operating system (8) is respectively gathered and middle relay group (4) is regulated and control, and carries out the switching operation of transformer through the said object switches set of auxiliary relay group (4) control.
2. the distribution transformer wireless monitoring device based on GPRS according to claim 1; It is characterized in that: said object control switch group (2) is made up of ten killer switch groups; Be respectively 1QF, 2QF, 3QF, 4QF, 5QF, 6QF, 7QF, 8QF, 9QF and 10QF, wherein:
4QF is connected in series in the high voltage input terminal of A section transformer, and 1QF is connected in series in the low-voltage output of A section transformer;
5QF is connected in series in the high voltage input terminal of B section transformer, and 2QF is connected in series in the low-voltage output of B section transformer;
6QF, 7QF and 8QF are connected in series in the high voltage input terminal of C section transformer, and 3QF is connected in series in the low-voltage output of C section transformer;
9QF connects the low-voltage output of A section transformer and B section transformer, and 10QF connects the low-voltage output of B section transformer and C section transformer.
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102904338A (en) * | 2012-08-16 | 2013-01-30 | 北海市深蓝科技发展有限责任公司 | Economical operation control method of transformer |
CN103595141A (en) * | 2013-11-29 | 2014-02-19 | 国网安徽省电力公司淮南供电公司 | Control method for converting independent operation state into split operation state in double-transformer system |
CN104574806A (en) * | 2014-11-17 | 2015-04-29 | 国家电网公司 | Laser fence warning prompt method for remote operation of transformer substation |
CN104868467A (en) * | 2015-05-14 | 2015-08-26 | 深圳市双合电气股份有限公司 | Economical operation control system and method for transformer |
CN105977003A (en) * | 2016-06-21 | 2016-09-28 | 威海市泓淋电子有限公司 | Adjustable resonant transformer |
CN107887976A (en) * | 2017-10-12 | 2018-04-06 | 国网山东省电力公司昌邑市供电公司 | Distribution transformer long-distance monitorng device |
CN111223715A (en) * | 2018-11-23 | 2020-06-02 | 施耐德电气工业公司 | Load switch |
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CN201805274U (en) * | 2009-12-23 | 2011-04-20 | 中国电力科学研究院 | Multifunctional intelligent TTU controller |
CN202218024U (en) * | 2011-07-07 | 2012-05-09 | 楼晓春 | Parallel distribution economic operation system |
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Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN201805274U (en) * | 2009-12-23 | 2011-04-20 | 中国电力科学研究院 | Multifunctional intelligent TTU controller |
CN202218024U (en) * | 2011-07-07 | 2012-05-09 | 楼晓春 | Parallel distribution economic operation system |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102904338A (en) * | 2012-08-16 | 2013-01-30 | 北海市深蓝科技发展有限责任公司 | Economical operation control method of transformer |
CN103595141A (en) * | 2013-11-29 | 2014-02-19 | 国网安徽省电力公司淮南供电公司 | Control method for converting independent operation state into split operation state in double-transformer system |
CN103595141B (en) * | 2013-11-29 | 2016-01-27 | 国网安徽省电力公司淮南供电公司 | In dual transformer system, separate unit runs the control method to split operation State Transferring |
CN104574806A (en) * | 2014-11-17 | 2015-04-29 | 国家电网公司 | Laser fence warning prompt method for remote operation of transformer substation |
CN104868467A (en) * | 2015-05-14 | 2015-08-26 | 深圳市双合电气股份有限公司 | Economical operation control system and method for transformer |
CN104868467B (en) * | 2015-05-14 | 2017-06-30 | 深圳市双合电气股份有限公司 | Transformer economical running control system and method |
CN105977003A (en) * | 2016-06-21 | 2016-09-28 | 威海市泓淋电子有限公司 | Adjustable resonant transformer |
CN107887976A (en) * | 2017-10-12 | 2018-04-06 | 国网山东省电力公司昌邑市供电公司 | Distribution transformer long-distance monitorng device |
CN111223715A (en) * | 2018-11-23 | 2020-06-02 | 施耐德电气工业公司 | Load switch |
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Application publication date: 20120815 |