CN111585346A - Remote inspection method and system - Google Patents

Remote inspection method and system Download PDF

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Publication number
CN111585346A
CN111585346A CN202010454897.0A CN202010454897A CN111585346A CN 111585346 A CN111585346 A CN 111585346A CN 202010454897 A CN202010454897 A CN 202010454897A CN 111585346 A CN111585346 A CN 111585346A
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CN
China
Prior art keywords
messages
power
health parameters
remote inspection
comparison
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010454897.0A
Other languages
Chinese (zh)
Inventor
张淦锋
钟智栋
王梦芝
刘伟
田洪磊
黄超
张勇
林磊
王坚俊
邹晖
陈川
叶海明
计荣荣
吴米佳
杨跃
吕旭东
陈旭
陈利华
柯梦晗
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Zhejiang Electric Power Co Ltd
Maintenance Branch of State Grid Zhejiang Electric Power Co Ltd
Inspection Branch of State Grid Zhejiang Electric Power Co Ltd
Original Assignee
State Grid Zhejiang Electric Power Co Ltd
Inspection Branch of State Grid Zhejiang Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Zhejiang Electric Power Co Ltd, Inspection Branch of State Grid Zhejiang Electric Power Co Ltd filed Critical State Grid Zhejiang Electric Power Co Ltd
Priority to CN202010454897.0A priority Critical patent/CN111585346A/en
Publication of CN111585346A publication Critical patent/CN111585346A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00001Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H02J13/00034Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving an electric power substation
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/7807
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/16Electric power substations
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S40/00Systems 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
    • Y04S40/12Systems 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

Abstract

The application discloses a remote inspection method and a system, which are applied to a power plant or a transformer substation of a power system, and particularly used for collecting messages of a secondary system, wherein the messages comprise messages of a bottom transmission layer and/or messages of an upper application layer; monitoring and analyzing the message, performing cross comparison processing on the multi-source data, and outputting health parameters of the secondary equipment according to a processing result; and outputting the health parameters to a user terminal through the power private network so that the user can check the health parameters through the user terminal. The health parameters can reflect the health state of the secondary equipment, so that a user does not need to inspect on site, a large amount of labor hour required by inspection on site is saved, and the labor hour is saved, so that the personnel and cost pressure of a power enterprise is reduced.

Description

Remote inspection method and system
Technical Field
The application relates to the technical field of electric power, in particular to a remote inspection method and system.
Background
The secondary system is used as a monitoring, controlling and protecting system of the power system, is not only a control center of a power grid, but also a defense line for guaranteeing the safety and stability of the power grid, and has a self-evident importance. Once equipment in the secondary system breaks down, the correctness of a control instruction is influenced if the equipment breaks down, and a power grid power failure accident is caused if the equipment breaks down. In order to ensure the reliable operation of various devices of a secondary system, a large amount of devices need to be arranged to perform power failure maintenance every year, a large amount of labor and time need to be consumed, and large personnel and cost pressure is caused for power enterprises.
Disclosure of Invention
In view of this, the present application provides a remote inspection method and system, which are used to inspect secondary devices of an electric power system in a remote manner, and reduce the personnel and cost pressure for electric power enterprises by saving labor and time.
In order to achieve the above object, the following solutions are proposed:
a remote inspection method is applied to a power plant or a transformer substation of a power system, and comprises the following steps:
collecting messages of a secondary system of the power system, wherein the messages comprise messages of a bottom transmission layer and/or messages of an upper application layer;
monitoring and analyzing the message, performing cross comparison processing on multi-source data, and outputting health parameters of the secondary equipment according to a processing result;
and outputting the health parameters to a user terminal through a power private network so that a user can view the health parameters through the terminal.
Optionally, the power plant includes a power plant, an energy storage power plant and a new energy power plant.
Optionally, the voltage class of the transformer substation is 10-1000 kilovolts.
Optionally, the cross-comparing the multi-source data includes:
and comparing the network flow change of the bottom transmission layer and the uploading application layer with the power grid tidal current waveform, and judging whether the equipment communication board card has a fault or not through comparison.
The utility model provides a long-range system of patrolling and examining, is applied to power system's power plant or transformer substation, long-range system of patrolling and examining includes:
the data flow awareness terminals are arranged on a secondary system of the transformer substation and are used for acquiring messages of the secondary system, wherein the messages comprise bottom layer transmission layer messages and/or upper layer application layer messages;
the multi-source data comparison device is connected with each data flow perception terminal and used for monitoring and analyzing the messages, performing cross comparison processing on multi-source data and outputting health parameters of the secondary equipment according to processing results;
and the data uploading device is used for outputting the health parameters to a user terminal through a power private network so that a user can view the health parameters through the terminal.
Optionally, the power plant includes a power plant, an energy storage power plant and a new energy power plant.
Optionally, the voltage class of the transformer substation is 10-1000 kilovolts.
Optionally, the multi-source data comparing device includes:
and the comparison execution unit is used for comparing the network flow change of the bottom transmission layer and the uploading application layer with the power grid tidal current waveform and judging whether the equipment communication board card has a fault or not through comparison.
Optionally, a multi-protocol parsing system is embedded in the multi-source data comparison device.
According to the technical scheme, the method and the system are applied to a power plant or a transformer substation of a power system, and specifically, messages of a secondary system are collected, wherein the messages comprise messages of a bottom transmission layer and/or messages of an upper application layer; monitoring and analyzing the message, performing cross comparison processing on the multi-source data, and outputting health parameters of the secondary equipment according to a processing result; and outputting the health parameters to a user terminal through the power private network so that the user can check the health parameters through the user terminal. The health parameters can reflect the health state of the secondary equipment, so that a user does not need to inspect on site, a large amount of labor hour required by inspection on site is saved, and the labor hour is saved, so that the personnel and cost pressure of a power enterprise is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a remote inspection method according to an embodiment of the present application;
fig. 2 is a schematic diagram of information display of a user terminal according to an embodiment of the present application;
fig. 3 is a block diagram of a remote inspection system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example one
Fig. 1 is a flowchart of a remote inspection method according to an embodiment of the present application.
As shown in fig. 1, the remote inspection method provided by this embodiment is applied to a power plant or a transformer substation, where the power plant includes a power plant, an energy storage power station, or a new energy power plant such as photovoltaic wind energy. The voltage class of the transformer substation can cover 10-1000 kilovolts, and the types of the transformer substation are not limited to alternating-current transformer substations and can also be direct-current converter stations. The remote inspection method comprises the following steps:
and S1, collecting messages of the secondary system.
The secondary system refers to messages of a secondary system of a power plant or a transformer substation of the power system, and the messages include messages of a bottom transmission layer and messages of an upper application layer, or only one of the messages is collected.
And S2, monitoring and analyzing the message to obtain the health parameters of the secondary system.
Namely, the messages of the bottom transmission layer and/or the messages of the upper application layer are monitored and analyzed, and cross comparison processing is carried out on multi-source data, so that the health parameters of the secondary equipment are obtained according to the processing result. Specifically, during processing, network flow changes of a bottom generation layer and an upper application layer are compared with power grid tidal current waveforms, so that whether a communication board card of the secondary equipment breaks down or not is judged.
And S3, outputting the health parameters to the user terminal through the electric power private network.
After the health parameters of the secondary equipment and the relevant information of whether the board card equipment has faults are obtained, the parameters and the information are output to a user terminal through a power special network, as shown in fig. 2, so that inspection personnel can check the parameters or the information through the user terminal, and whether the secondary equipment has faults is judged in a remote mode.
According to the technical scheme, the implementation provides a remote inspection method which is applied to a power plant or a transformer substation of a power system, and specifically, messages of a secondary system are collected, wherein the messages comprise messages of a bottom transmission layer and/or messages of an upper application layer; monitoring and analyzing the message, performing cross comparison processing on the multi-source data, and outputting health parameters of the secondary equipment according to a processing result; and outputting the health parameters to a user terminal through the power private network so that the user can check the health parameters through the user terminal. The health parameters can reflect the health state of the secondary equipment, so that a user does not need to inspect on site, a large amount of labor hour required by inspection on site is saved, and the labor hour is saved, so that the personnel and cost pressure of a power enterprise is reduced.
Example two
Fig. 3 is a block diagram of a remote inspection system according to an embodiment of the present application.
As shown in fig. 3, the remote inspection system provided by this embodiment is applied to a power plant or a transformer substation, where the power plant includes a power plant, an energy storage power station, or a new energy power plant such as photovoltaic wind energy. The voltage class of the transformer substation can cover 10-1000 kilovolts, and the types of the transformer substation are not limited to alternating-current transformer substations and can also be direct-current converter stations. The remote inspection system comprises a plurality of data flow perception terminals 10, a multi-source data comparison device 20 and a data uploading device 30.
Each data flow sensing terminal is used for collecting messages of the secondary system.
The secondary system refers to messages of a secondary system of a power plant or a transformer substation of the power system, and the messages include messages of a bottom transmission layer and messages of an upper application layer, or only one of the messages is collected.
The multi-source data comparison device is used for monitoring and analyzing the messages to obtain the health parameters of the secondary system.
Namely, the messages of the bottom transmission layer and/or the messages of the upper application layer are monitored and analyzed, and cross comparison processing is carried out on multi-source data, so that the health parameters of the secondary equipment are obtained according to the processing result. The module further comprises a comparison execution unit, and particularly when the module is used for processing, the comparison execution unit is used for comparing the network flow change of the bottom generation layer and the upper application layer with the power grid tidal current waveform so as to judge whether the communication board card of the secondary equipment fails.
The multi-protocol data comparison device is embedded with a multi-protocol analysis system and is used for analyzing various protocols and analyzing, processing or transmitting the analyzed data through a unified protocol. Therefore, the situation that a traditional monitoring system, a PMU device and an electric energy device are operated respectively is broken through, massive multi-source heterogeneous data are rapidly processed, data analysis, storage and packaging are completed, and panoramic integration of secondary equipment information is achieved.
The data uploading device is used for outputting the health parameters to the user terminal through the electric power private network.
After the health parameters of the secondary equipment and the relevant information whether the board card equipment has faults are obtained, the parameters and the information are output to a user terminal through a power special network, so that inspection personnel can check the parameters or the information through the user terminal, and whether the secondary equipment has faults or not is judged in a remote mode.
According to the technical scheme, the implementation provides the remote inspection system which is applied to a power plant or a transformer substation of a power system, and particularly collects messages of a secondary system, wherein the messages comprise messages of a bottom transmission layer and/or messages of an upper application layer; monitoring and analyzing the message, performing cross comparison processing on the multi-source data, and outputting health parameters of the secondary equipment according to a processing result; and outputting the health parameters to a user terminal through the power private network so that the user can check the health parameters through the user terminal. The health parameters can reflect the health state of the secondary equipment, so that a user does not need to inspect on site, a large amount of labor hour required by inspection on site is saved, and the labor hour is saved, so that the personnel and cost pressure of a power enterprise is reduced.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The technical solutions provided by the present invention are described in detail above, and the principle and the implementation of the present invention are explained in this document by applying specific examples, and the descriptions of the above examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (9)

1. A remote inspection method is applied to a power plant or a transformer substation of a power system, and is characterized by comprising the following steps:
collecting messages of a secondary system of the power system, wherein the messages comprise messages of a bottom transmission layer and/or messages of an upper application layer;
monitoring and analyzing the message, performing cross comparison processing on multi-source data, and outputting health parameters of the secondary equipment according to a processing result;
and outputting the health parameters to a user terminal through a power private network so that a user can view the health parameters through the terminal.
2. The remote inspection system according to claim 1, wherein the power plants include power plants, energy storage power plants, and new energy power plants.
3. The remote inspection system according to claim 1, wherein the substation has a voltage rating of 10-1000 kilovolts.
4. The remote inspection system according to claim 1, wherein the cross-comparing the multi-source data includes:
and comparing the network flow change of the bottom transmission layer and the uploading application layer with the power grid tidal current waveform, and judging whether the equipment communication board card has a fault or not through comparison.
5. The utility model provides a long-range system of patrolling and examining, is applied to power system's power plant or transformer substation, its characterized in that, long-range system of patrolling and examining includes:
the data flow awareness terminals are arranged on a secondary system of the transformer substation and are used for acquiring messages of the secondary system, wherein the messages comprise bottom layer transmission layer messages and/or upper layer application layer messages;
the multi-source data comparison device is connected with each data flow perception terminal and used for monitoring and analyzing the messages, performing cross comparison processing on multi-source data and outputting health parameters of the secondary equipment according to processing results;
and the data uploading device is used for outputting the health parameters to a user terminal through a power private network so that a user can view the health parameters through the terminal.
6. The remote inspection system according to claim 5, wherein the power plants include power plants, energy storage power plants, and new energy power plants.
7. The remote inspection system according to claim 5, wherein the substation has a voltage rating of 10-1000 kilovolts.
8. The remote inspection system according to claim 5, wherein the multi-source data comparison device includes:
and the comparison execution unit is used for comparing the network flow change of the bottom transmission layer and the uploading application layer with the power grid tidal current waveform and judging whether the equipment communication board card has a fault or not through comparison.
9. The remote inspection system according to claim 5, wherein the multi-source data comparison device is embedded with a multi-protocol parsing system.
CN202010454897.0A 2020-05-26 2020-05-26 Remote inspection method and system Pending CN111585346A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010454897.0A CN111585346A (en) 2020-05-26 2020-05-26 Remote inspection method and system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010454897.0A CN111585346A (en) 2020-05-26 2020-05-26 Remote inspection method and system

Publications (1)

Publication Number Publication Date
CN111585346A true CN111585346A (en) 2020-08-25

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Application Number Title Priority Date Filing Date
CN202010454897.0A Pending CN111585346A (en) 2020-05-26 2020-05-26 Remote inspection method and system

Country Status (1)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104242447A (en) * 2013-12-25 2014-12-24 中国南方电网有限责任公司 Integrated measuring and controlling device and system of intelligent transformer substation
CN110535238A (en) * 2019-08-23 2019-12-03 国网山东省电力公司泗水县供电公司 A kind of transformer equipment intelligent monitor system and method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104242447A (en) * 2013-12-25 2014-12-24 中国南方电网有限责任公司 Integrated measuring and controlling device and system of intelligent transformer substation
CN110535238A (en) * 2019-08-23 2019-12-03 国网山东省电力公司泗水县供电公司 A kind of transformer equipment intelligent monitor system and method

Non-Patent Citations (1)

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Title
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