CN1523730A - Tandem connection type network power control system - Google Patents
Tandem connection type network power control system Download PDFInfo
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- CN1523730A CN1523730A CNA031060862A CN03106086A CN1523730A CN 1523730 A CN1523730 A CN 1523730A CN A031060862 A CNA031060862 A CN A031060862A CN 03106086 A CN03106086 A CN 03106086A CN 1523730 A CN1523730 A CN 1523730A
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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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/16—Electric power substations
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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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/18—Systems supporting electrical power generation, transmission or distribution using switches, relays or circuit breakers, e.g. intelligent electronic devices [IED]
Abstract
A serial network power control system includes at least one controlled site(such as a power substation) containing a front end processor(FEP), which includes at least two network ports(one up-line network port and a downstream network port) and a control center utilizing fibers to connect ports of the FEP and utilize it to connect with each controlled site, among which, the network ports are connected with ports of FEP of the front and rear controlled sites to receive normal/abnormal signals from an IED in the front controlled site to be sent to the local IED via RS-232 or RS-485 port.
Description
Technical field
The present invention relates to a kind of concatenation type network electric power control system; relating in particular to a kind of mode of a TCM of utilizing receives and the concatenation type network electric power control system that transmits a normal/abnormal signal on main fiber in addition; whereby; whether each controlled platform of this concatenation type network electric power control system just can be with it normal or unusual real time status notice control centre arranged, and according to the unusual condition of generation to determine whether this controlled platform breaks away from outside whole electric power system.
Background technology
The electric power electric substation of prior art is the power conversions station, in order to raising or reduction voltage, and distributes power consumption.The power plant send in the process of electricity in the user family, and electric substation's role can be likened the overpass of highway to.Vehicle must quicken at overpass before last highway in advance; In like manner, the electricity that sends of power plant will just can be carried through electric substation's boosted voltage earlier in a large number fast.Vehicle will enter the urban district, and the overpass deceleration is gone slowly down, drives towards streets and lanes again, and is same, and high-tension electricity must reduce voltage through electric power electric substation just can send various places in regular turn, and is reduced to the spendable voltage of user piecemeal.
General network electric power control system all is to adopt starlike connection, that is to say that a control centre can be connected at least one controlled platform respectively.And each controlled platform and and control centre between, must need to carry out the transmission of some real time datas.Except these real time datas, include the transmission of real-time normal/abnormal signal between each controlled platform in addition, so could allow and respectively control the situation of accurately grasping the adjacent controlled platform in its front and back between the platform.Yet, in the network electric power control system of prior art, these normal/abnormal signals are after converting light signal to earlier by the optical-electrical converter that is connected with the RS232 connectivity port of transmitting these signals, to carry out transmitting between 2 and receiving on the special optic fibre on the main fiber cable again.Yet the connection meeting on the Control Network between each controlled platform connects because can't carry out practical remote expansion in the restriction of optical fiber effective communication length.
See also Fig. 1, it is the structure calcspar of the concatenation type network electric power control system 10 of prior art.Concatenation type network electric power control system 10 includes the controlled platform of at least one electric power (being preferably electric power electric substation) 20 and 30 and one control centre 32.Wherein, utilize a main fiber 34 or 34 ' to be connected to each other between controlled platform 20,30 of each electric power and control centre, with transmitting real-time data.In addition, have a power line 35 (as 22.8 kilovolts) to connect the controlled platform 20 of each electric power and 30 in addition, this voltage of 22.8 kilovolts will can send client to and use after the controlled platform of electric power be finished the operation that reduces voltage.
The controlled platform 20 of electric power (30 in like manner) includes at least one circuit breaker 36,136,236 and 336, at least one load 37,137,237 and 337, at least one repeater 38,138, and a front-end processor 39.In case when unusual condition appearred in the controlled platform 20 of electric power, circuit breaker 36,136,236 and 336 can break away from the controlled platform 20 of whole electric power from power line 35, to protect controlled platform 20 of this electric power and even whole network electric power system 10.So-called unusual condition includes situations such as electric current overload, short circuit, thunderbolt, overvoltage or overtemperature.Except the abnormal reaction situation, have a real time data between the controlled platform 20 of each electric power and 30 equally and between control centre 32 and the controlled platform 20 of each electric power and 30, exchange by main fiber 34.These real time datas must be earlier through the optical-electrical converter (not shown) in the front-end processor 39 with after converting electronic signal to earlier, could be received by the controlled platform 20 of electric power; Same reason, the real time data that the controlled platform 20 of electric power will be exported after also wanting to convert light signal to by optical-electrical converter earlier, just can transmit on main fiber 34.
Network electric power control system 10 includes an other electrical to optical converter 43, optical-electrical converter 44 in addition, and is connected in an optical fiber 134 between this electrical to optical converter 43 and the optical-electrical converter 44.Be used for the RS232 connectivity port of an abnormal signal by repeater 138 of abnormal reaction situation, just reaching the controlled platform 30 of next electric power through behind electrical to optical converter 43, inferior optical fiber 134 and the optical-electrical converter 44.Just abnormal signal need just can not be transmitted or receive by the flow process of above-mentioned electric light/opto-electronic conversion, with respect to a normal signal of this abnormal signal, must could and receive in the controlled platform 20 of each electric power and 30 transmission by electric light/opto-electronic conversion and through time optical fiber 134 too.Giving the controlled platform 30 of another electric power when the controlled platform 20 of electric power itself can transmit so-called normal signal, promptly is to inform the controlled platform 30 of this electric power, and the controlled platform 20 no abnormal situations of electric power take place.
In summary, the concatenation type network electric power control system of described prior art on reality is used, obviously exists inconvenience and defective, so be necessary to be improved.
Summary of the invention
At above-mentioned defective, main purpose of the present invention is to provide a kind of concatenation type network system of utilizing the TCM mode to finish the controlled platform of each electric power and control centre's exchanges data.Network system of the present invention provides software and firmware program in the front-end processor of the controlled platform of each electric power, make it be able to normal/abnormal signal is transmitted on same the main fiber of transmitting real-time data by being used for equally, the exchange that not only can not have influence between each electric substation and the control centre about these real time datas transmits, and more can therefore save the cost that is provided with of special optic fibre and optical-electrical converter.
To achieve the above object, concatenation type network electric power control system of the present invention includes: the controlled platform of at least one electric power (site), include: a front-end processor (Front End Processor, FEP), at least include a uplink network port and a descending network port, at least one circuit breaker (circuit breaker), at least one load (load), and one front end repeater (Repeater) be electrically connected an and control centre respectively with front-end processor with a rear end repeater.Control centre utilizes an optical fiber to be connected with the uplink network port of the front-end processor of the controlled platform of immediate electric power, and utilizes the downlink network port of this front-end processor and the controlled platform foundation of each electric power to get in touch.The uplink network port is electrically connected with the downlink network port of the front-end processor of the controlled platform of last electric power, being used for the normal/abnormal signal of IED (intelligent electric power equipment) in the last electric power regulated station of intercommunication, and the normal/abnormal signal of our station IED is sent to the uplink network port of the controlled platform front-end processor of next electric power by the Network Transmission port.Whether normal/abnormal signal is used for notifying the IED of the controlled platform of this electric power to have a unusual condition to take place, so that the controlled platform of electric power that unusual condition takes place is broken away from outside whole concatenation type network electric power control system.
To achieve these goals, the invention provides a kind of concatenation type network electric power control system, wherein, include:
(1) the controlled platform of at least one electric power includes:
(a) front-end processor includes a uplink network port and a descending network port at least;
(b) at least one circuit breaker;
(c) at least one load; And
(d) two intelligent electric power equipment are connected with this front-end processor and this circuit breaker electric respectively; And
(2) one control centres, it utilizes an optical fiber to be connected with the uplink network port of this front-end processor, and utilizes the controlled platform of the downlink network port of this front-end processor and this electric power respectively to set up and get in touch;
Wherein this uplink network port is electrically connected with the downlink network port of the front-end processor of the controlled platform of last this electric power, be used for receiving a normal/abnormal signal from the front-end processor of the controlled platform of last this electric power, and will this normal/abnormal signal be sent to the uplink network port of the front-end processor of the controlled platform of next this electric power by this downlink network port, whether this normal/abnormal signal is used for notifying this control centre to have a unusual condition to take place, so that this unusual condition when taking place, makes the controlled platform of this electric power break away from this concatenation type network electric power control system.
Described concatenation type network electric power control system, wherein, this front-end processor also includes a pair of optical-electrical converter.
Described concatenation type network electric power control system, wherein, this front-end processor includes a technical grade single board computer.
Described concatenation type network electric power control system, wherein, this optical-electrical converter converts the light signal on this optical fiber to a corresponding electronic signal and maybe converts this electronic signal of this intelligent electric power equipment to this light signal.
Described concatenation type network electric power control system, wherein, this technical grade single board computer includes at least one RS232 connectivity port in addition and is electrically connected with this intelligent electric power equipment.
Described concatenation type network electric power control system, wherein, the signal transmitting and receiving speed of this RS232 connectivity port is less than the signal transmitting and receiving speed of this optical fiber.
Described concatenation type network electric power control system wherein, is back to the shortest path of this normal/abnormal signal of this control centre through this optical fiber.
Described concatenation type network electric power control system wherein, also includes a real-time control data and transmits by this optical fiber.
A kind of TCM concatenation type network electric power control system, wherein, it includes:
(1) the controlled platform of at least one electric power includes:
V. a front-end processor includes a uplink network port and a descending network port at least;
Vi. at least one circuit breaker;
Vii. at least one load; And
Viii. two intelligent electric power equipment are connected with this front-end processor and this circuit breaker electric respectively; And
(2) one control centres, it utilizes an optical fiber to be connected with the uplink network port of this front-end processor, and utilizes the controlled platform of the downlink network port of this front-end processor and this electric power respectively to set up and get in touch;
Wherein this front-end processor is used for transmitting and receive a normal/abnormal signal and is sent to the front-end processor of the controlled platform of another this electric power, when in case the controlled platform of certain this electric power has a unusual condition to take place, this normal/abnormal signal is notified this control centre, and make the controlled platform of this electric power can break away from this TCM concatenation type network electric power control system, and this normal/abnormal signal transmits with a shortest path on this optical fiber in the mode of a TCM.
Described TCM concatenation type network electric power control system, wherein, this front-end processor includes a pair of optical-electrical converter.
Described TCM concatenation type network electric power control system, wherein, this front-end processor includes a technical grade single board computer.
Described TCM concatenation type network electric power control system, wherein, this optical-electrical converter converts the light signal on this optical fiber to a corresponding electronic signal and maybe converts this electronic signal in this intelligent electric power equipment to this light signal.
Described TCM concatenation type network electric power control system, wherein, this technical grade single board computer also includes at least one RS232 connectivity port and is electrically connected with this intelligent electric power equipment.
Described TCM concatenation type network electric power control system, wherein, the signal transmitting and receiving speed of this RS232 connectivity port is less than the signal transmitting and receiving speed of this optical fiber.
Brief Description Of Drawings
Below in conjunction with accompanying drawing,, will make technical scheme of the present invention and other beneficial effects apparent by detailed description to preferred embodiment of the present invention.
In the accompanying drawing,
Fig. 1 is the network electric power control system structure calcspar of prior art;
Fig. 2 is the structure calcspar of network electric power control system of the present invention;
Fig. 3 is the built-in function calcspar of the front-end processor of network electric power control system of the present invention.
Embodiment
Hereinafter, will describe the present invention in detail.
See also Fig. 2, it is the calcspar of concatenation type network electric power control system 100 of the present invention.Concatenation type network electric power control system 100 of the present invention includes the controlled platform 200,300 of at least one electric power and is connected to each other in the mode of contacting.The present invention includes a control centre 302 in addition and connects the controlled platform 200 of these electric power and 300 by optical fiber 303, and a power line 304 (being 22.8 kilovolts power line in the present embodiment), is connected to the controlled platform 200 of each electric power and 300 equally.
The controlled platform of electric power 200 and 300 is mutually the same, includes at least one circuit breaker 305,401, one loads, 306,402, two intelligent electric power equipment (IED) 307,308 and 403,404 respectively, and a front-end processor 309 and 405.Front-end processor 309 and 405 all includes a uplink network port and a descending network port (not shown).
The uplink network port is connected with the downlink network port of the front-end processor 309 of the controlled platform of last electric power (being preferably 200), and in order to receive/to send the normal/abnormal signal from the front-end processor 308 of last controlled platform 200.Whether normal/abnormal signal is used for notifying control centre 302 to have a unusual condition to take place, so that when unusual condition takes place, the power line part (as 304.1) of the controlled platform of electric power that unusual condition takes place is broken away from outside the power line 304, thereby make the controlled platform 200 of this electric power break away from outside electric control system 100.
Since between the controlled platform 200 of each electric power and 300 all by main fiber 303 series, as 303.1,303.2～303.n connection.Front-end processor 309 promptly is to be connected optical fiber 303 with 405 external interfaces, and optical-electrical converter is built in front-end processor 309 and 405 in, and optical fiber interface is also referred to as " network port ".
The controlled platform 200 of each electric power and 300 and control centre 302 between, utilize optical fiber 303 to transmit and receive a real-time control data at any time.Except these real-time control datas, be used for notifying control centre 302 whether to have the controlled platform of any electric power to be in the normal/abnormal signal of abnormality, same optical fiber 303 through big frequency range (transmitting-receiving speed) transmits and receives.For instance; when the controlled platform 200 of electric power has unusual condition; except circuit breaker 305 can break away from the controlled platform 200 of this electric power; be not connected with outside the controlled platform 200 of protection electric power with power line 304; the downlink network port that also has abnormal signal process front-end processor 309 is passed to the uplink network port of the front-end processor 405 of the controlled platform 300 of next electric power, also can continue by optical fiber 303 this abnormal signal to be recycled to control centre 302 with a shortest fiber path simultaneously.Same reason, there is unusual condition to take place if change the controlled platform 300 of electric power into, system then can follow the principle of short fiber path passback, so this abnormal signal just can be sent to the downlink network port of the front-end processor 309 of the controlled platform 200 of electric power by the uplink network port of front-end processor 405 of itself, be sent to control centre 302 by the uplink network port of front-end processor 309 by optical fiber 303 more afterwards.
On prior art system, normal signal or abnormal signal, the general 9.6Kb optical-electrical converters that need other use RS232 connectivity port (9.6Kb) and special use etc. the comparatively sequence transmission port of low speed are received and dispatched, the present invention is used in to write software or firmware program in each front-end processor 309 and 405, and these normal/abnormal signals are transmitted and receive by optical fiber 303.So the result of design does not only have to destroy the transmitting-receiving speed of originally utilizing the real-time control data of optical fiber 303 transmission, can also more effectively utilize the big frequency range of optical fiber in the mode of TCM, to reach the same result who receives normal/abnormal signal that transmits fast.Simultaneously, when unusual condition takes place in communication transfer path (the controlled platform of some electric power just), because optical fiber 303 is divided into several sections (as 303.1 to 303.n), so other electric power platform that unusual condition do not take place also can keep and the getting in touch of 302 in control centre through the controlled platform fiber segment of other electric power that does not interrupt.
See also Fig. 3, it is the built-in function calcspar of the front-end processor 500 of TCM concatenation type network electric power control system of the present invention.Front-end processor 500 includes 502, one groups of optical-electrical converters 503 of a technical grade single board computer and 504.Optical-electrical converter 503 and 504 be used for will input light signal convert electronic signal to or convert the electronic signal of front-end processor 500 inside to light signal, be sent to respectively again on Ethernet (Ethernet) connectivity port 508 or optical fiber of technical grade single board computer 502.
Technical grade single board computer 502 includes a modularization disk (Disk On Module in addition, DOM) 507 be used for storing the software program that writes, at least two Ethernet connectivity ports 508 are electrically connected with 504 with optical-electrical converter 503, and at least one RS232 connectivity port 509 is connected with intelligent electric power equipment (IED).So, when the controlled platform of this electric power has unusual condition, before the abnormal signal that reacted of the intelligent electric power equipment of (back) end in the repeater just can be sent on the optical fiber through this RS232 connectivity port 509 and Ethernet connectivity port 508, the controlled platform of next electric power was done the relaying transmission or was directly delivered to control centre's (it is example near control centre that this situation betides the controlled platform of electric power) in the past.Except abnormal signal, RS232 connectivity port 509 can be used for transmitting normal signal equally, and the transmission of signal promptly all takes place when normal or unusual situation takes place.Because the signal transmitting and receiving speed of RS232 connectivity port 509 is affirmed the transmission rate (because of the few cause of data volume) less than the existing fiber technology, so after transmitting real-time control data by optical fiber, can utilize the design of the software/firmware program that is stored in modularization disk 507 additionally to transmit normal/abnormal signal equally, not only do not influence outside the transmission and reception of original real-time control signal, the transmission that can also accelerate normal/abnormal signal receives operation, thereby promotes the operational paradigm of whole concatenation type network electric power control system.
Ethernet connectivity port 508 can be connected with a computer in addition, and the system manager is by just carrying out the modification and the revisal of software/firmware program to the operation of computer.Front-end processor 500 can include a LCD (LCD) 511 in addition and be electrically connected with RS232 connectivity port 509, is used for showing the operating state of this front-end processor 500.
Than prior art, TCM concatenation type network electric power control system of the present invention, can be in acceptable time postpones scope the entity distribution distance of system be expanded to farther scope, the residue frequency range of optical fiber that also can be by originally only being used for transmitting real-time control data transmits and receives normal/abnormal signal.By the design of software/firmware program, these normal/abnormal signals transmit the relaying by each possible controlled platform of electric power, and pass back to control centre through short fiber path, and whether the generation of a unusual condition is arranged with notice control centre.So, the optical fiber other between the controlled platform of each electric power and the setting of optical-electrical converter can be saved in the prior art, thereby the construction cost of whole network system can be significantly reduced.
Be understandable that; for the person of ordinary skill of the art; can make other various corresponding changes and distortion according to technical scheme of the present invention and technical conceive, and all these changes and distortion all should belong to the protection range of accompanying Claim of the present invention.
Claims (14)
1, a kind of concatenation type network electric power control system is characterized in that, includes:
(1) the controlled platform of at least one electric power includes:
(a) front-end processor includes a uplink network port and a descending network port at least;
(b) at least one circuit breaker;
(c) at least one load; And
(d) two intelligent electric power equipment are connected with this front-end processor and this circuit breaker electric respectively; And
(2) one control centres, it utilizes an optical fiber to be connected with the uplink network port of this front-end processor, and utilizes the controlled platform of the downlink network port of this front-end processor and this electric power respectively to set up and get in touch;
Wherein this uplink network port is electrically connected with the downlink network port of the front-end processor of the controlled platform of last this electric power, be used for receiving a normal/abnormal signal from the front-end processor of the controlled platform of last this electric power, and will this normal/abnormal signal be sent to the uplink network port of the front-end processor of the controlled platform of next this electric power by this downlink network port, whether this normal/abnormal signal is used for notifying this control centre to have a unusual condition to take place, so that this unusual condition when taking place, makes the controlled platform of this electric power break away from this concatenation type network electric power control system.
2, concatenation type network electric power control system according to claim 1 is characterized in that this front-end processor also includes a pair of optical-electrical converter.
3, concatenation type network electric power control system according to claim 2 is characterized in that, this front-end processor includes a technical grade single board computer.
4, concatenation type network electric power control system according to claim 3 is characterized in that, this optical-electrical converter converts the light signal on this optical fiber to a corresponding electronic signal and maybe converts this electronic signal of this intelligent electric power equipment to this light signal.
5, concatenation type network electric power control system according to claim 3 is characterized in that, this technical grade single board computer includes at least one RS232 connectivity port in addition and is electrically connected with this intelligent electric power equipment.
6, concatenation type network electric power control system according to claim 5 is characterized in that, the signal transmitting and receiving speed of this RS232 connectivity port is less than the signal transmitting and receiving speed of this optical fiber.
7, concatenation type network electric power control system according to claim 1 is characterized in that, is back to the shortest path of this normal/abnormal signal of this control centre through this optical fiber.
8, concatenation type network electric power control system according to claim 1 is characterized in that, also includes a real-time control data and transmits by this optical fiber.
9, a kind of TCM concatenation type network electric power control system is characterized in that it includes:
(1) the controlled platform of at least one electric power includes:
I. a front-end processor includes a uplink network port and a descending network port at least;
Ii. at least one circuit breaker;
Iii. at least one load; And
Iv. two intelligent electric power equipment are connected with this front-end processor and this circuit breaker electric respectively; And
(2) one control centres, it utilizes an optical fiber to be connected with the uplink network port of this front-end processor, and utilizes the controlled platform of the downlink network port of this front-end processor and this electric power respectively to set up and get in touch;
Wherein this front-end processor is used for transmitting and receive a normal/abnormal signal and is sent to the front-end processor of the controlled platform of another this electric power, when in case the controlled platform of certain this electric power has a unusual condition to take place, this normal/abnormal signal is notified this control centre, and make the controlled platform of this electric power can break away from this TCM concatenation type network electric power control system, and this normal/abnormal signal transmits with a shortest path on this optical fiber in the mode of a TCM.
10, TCM concatenation type network electric power control system according to claim 9 is characterized in that this front-end processor includes a pair of optical-electrical converter.
11, TCM concatenation type network electric power control system according to claim 10 is characterized in that this front-end processor includes a technical grade single board computer.
12, TCM concatenation type network electric power control system according to claim 11, it is characterized in that this optical-electrical converter converts the light signal on this optical fiber to a corresponding electronic signal and maybe converts this electronic signal in this intelligent electric power equipment to this light signal.
13, TCM concatenation type network electric power control system according to claim 11 is characterized in that, this technical grade single board computer also includes at least one RS232 connectivity port and is electrically connected with this intelligent electric power equipment.
14, TCM concatenation type network electric power control system according to claim 13 is characterized in that the signal transmitting and receiving speed of this RS232 connectivity port is less than the signal transmitting and receiving speed of this optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031060862A CN1523730A (en) | 2003-02-18 | 2003-02-18 | Tandem connection type network power control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031060862A CN1523730A (en) | 2003-02-18 | 2003-02-18 | Tandem connection type network power control system |
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| Publication Number | Publication Date |
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| CN1523730A true CN1523730A (en) | 2004-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA031060862A Pending CN1523730A (en) | 2003-02-18 | 2003-02-18 | Tandem connection type network power control system |
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| CN (1) | CN1523730A (en) |
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2003
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