CN111585351A - Intelligent protection warning method for transformer substation based on Internet of things - Google Patents
Intelligent protection warning method for transformer substation based on Internet of things Download PDFInfo
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- CN111585351A CN111585351A CN202010513950.XA CN202010513950A CN111585351A CN 111585351 A CN111585351 A CN 111585351A CN 202010513950 A CN202010513950 A CN 202010513950A CN 111585351 A CN111585351 A CN 111585351A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit 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
- H02J13/00001—Circuit 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]
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit 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
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00034—Systems 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
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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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
- Y04S40/128—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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- General Physics & Mathematics (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention provides an intelligent substation protection warning method based on the Internet of things, which belongs to the technical field of electric power protection methods and comprises the following steps: arranging a protection warning device in the transformer substation, and connecting the protection warning device with a transformer substation operation and control workstation through signals; the transformer substation control workstation displays the running state of the protection warning device and transmits a control instruction to the protection warning device through the signal transmission control mainboard according to the transformer substation remote signaling information; after receiving the control instruction, a motor controller of the protection warning device controls the electric push rod to act; meanwhile, an angle sensor arranged on the electric push rod sends a real-time inclination angle signal of the electric push rod to the motor controller, and the motor controller adjusts the action speed and the stroke distance of the electric push rod after receiving the angle signal until the requirement of the control instruction is met. The application of the invention can greatly reduce the time for arranging and removing the prior barrier and/or warning board and improve the operation safety and efficiency.
Description
Technical Field
The invention belongs to the technical field of electric power protection methods, and particularly relates to an intelligent protection warning method for a transformer substation based on the Internet of things.
Background
When the transformer substation works, the planning time is usually the switching operation starting time, after the switching operation is completed, a certain time is needed for setting the fence and the signboard, and the larger the working site is, the more complicated the field measurement setting is, and the overhauling working time is influenced. Similarly, after the maintenance work is finished, the fence and the signboard need to be dismantled, and much time is spent, so that the power transmission time is influenced.
A patent document with publication (announcement) number CN202009267U discloses an integrated monitoring and analyzing system for states of intelligent substation equipment, which comprises a plurality of substation monitoring systems, a monitoring center and a client; the transformer substation monitoring system comprises a transformer substation database server and a plurality of data acquisition terminals; a transformer substation database and transformer substation monitoring analysis software are arranged in the transformer substation database server; the monitoring center comprises an application server, a data management server, a relational database server and a real-time database server, wherein the data management server, the relational database server and the real-time database server are all connected with the application server; and the client is connected with a substation database server of the substation monitoring system and an application server of the monitoring center. The invention is especially suitable for monitoring the transformer substation, and has the advantages of realizing real-time monitoring and analysis of the equipment state, improving the working efficiency and quality of transformer operation and equipment maintenance, and the like. However, the monitoring system does not play a corresponding warning role during the overhaul of the transformer substation.
Patent document with publication (publication) number CN105389942A discloses a remote operation warning system for transformer substation, which includes a person entering and exiting sensing device and a remote operation prompting device connected by communication; the personnel in-out sensing device is used for monitoring the personnel in-out condition of the transformer substation switch room and transmitting information to the remote operation prompting device; the remote operation prompting device sends the information of the number of the personnel in the switch room of the transformer substation to a display terminal of a regulation center; the remote operation prompting device is provided with a personnel evacuation alarming module, if people exist in a switch room of the transformer substation, the regulation and control center sends personnel evacuation information to the remote operation prompting device before controlling the controlled equipment, and the personnel evacuation alarming module informs field workers to evacuate the controlled equipment. The invention avoids the possible personal accidents caused by the fact that the workers still exist near the controlled equipment when the equipment is operated remotely.
Patent document with publication number CN105654665B discloses a transformer substation on-site safety intelligence warning device, including rectangular box-like casing, suspension rope, its characterized in that: the back of the rectangular box-shaped shell is provided with a magnet plate; a circuit board is arranged in the inner part of the shell; two LED indicator lamps, keys and an LED display screen are arranged on the front panel surface; the circuit board is provided with a central data processing module, a Siemens TC35 communication module, a voice device, an infrared sensor, a 12V4AH storage battery and a storage battery charging/discharging circuit thereof; the Siemens TC35 communication module and the mobile phone remote communication terminal communicate through a GSM network. The warning device not only warns the safety of personnel when entering the operation of the transformer substation, but also can remotely control and manage through the mobile phone short messages, and can uniformly and remotely manage the safety of all the transformer substations in the jurisdiction area according to the weather change at any time. And convenient operation, good real-time, the maintenance is simple, great improvement becomes electric safety control level.
Disclosure of Invention
In view of this, the technical problem to be solved by the present invention is to provide a transformer substation intelligent protection warning method based on the internet of things, so as to improve the safety and the operation efficiency of the transformer substation overhaul operation.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the intelligent protection warning method for the transformer substation based on the Internet of things comprises the following steps:
s1: arranging a protection warning device in the transformer substation, and connecting the protection warning device with a transformer substation operation and control workstation in a signal mode;
s2: the transformer substation control workstation displays the running state of the protection warning device and transmits a control instruction to the protection warning device through the signal transmission control mainboard according to the transformer substation remote signaling information;
s3: after receiving the control instruction, a motor controller of the protection warning device controls the electric push rod to act;
meanwhile, an angle sensor arranged on the electric push rod sends a real-time inclination angle signal of the electric push rod to a motor controller, and the motor controller adjusts the action speed and the stroke distance of the electric push rod after receiving the angle signal until the requirement of the control instruction is met.
Preferably, the substation control workstation is provided with a host and a computer monitoring screen connected with the host, the host is connected with an input keyboard, the input keyboard is provided with a rising control key, a stopping control key, a falling control key and a digital key, and the computer monitoring screen displays the running state of the protection warning device.
Preferably, the operation state of the protection warning device includes ascending, stopping and descending.
Preferably, the adjusting of the action speed and the stroke distance of the electric push rod comprises:
when the control instruction is ascending, setting the travel distance of the electric push rod through an input keyboard, controlling the electric push rod to start by the motor controller, and adjusting the speed of the electric push rod within the travel distance from high to low until the electric push rod stops according to the angle information transmitted by the angle sensor; or the like, or, alternatively,
when the control instruction is descending, the travel distance of the electric push rod is set through the input keyboard, the motor controller controls the electric push rod to start, and the speed of the electric push rod is adjusted from high to low within the travel distance according to the angle information transmitted by the angle sensor until the electric push rod stops.
Preferably, the protection warning device is respectively arranged at the interval, the circuit breaker and the disconnecting switch mechanism box.
Preferably, protection warning device includes lift platform, lift platform includes base, scissors support and mesa, set up electric putter between base and the scissors support, electric putter and angle sensor all with motor controller signal connection, motor controller and signal emission control mainboard signal connection, signal emission control mainboard and transformer substation control workstation signal connection.
Preferably, a fence or a warning board is arranged on the table top.
Preferably, the angle sensor is an electronic gyroscope.
At present, the arrangement of the shielding and warning boards at each interval of the transformer substation is carried out manually, time and labor are wasted, and 30 minutes is needed for arranging or removing the shielding and warning boards at one interval; complicated work, arranging or removing the shielding and warning board, which takes 60 minutes or more; due to the fact that the time for arranging or removing the shielding plate and the warning plate is too long, the overhaul working hours are reduced, the power transmission time is influenced to a certain extent, and the bottleneck of improving the power transmission quantity of the transformer substation is formed. Although the existing transformer substation also has warning devices such as remote control warning lamps, for example: patent documents CN105389942A and CN105654665A, however, only achieve the warning effect, and do not achieve the substantial safety isolation effect, and therefore cannot replace safety isolation facilities such as barriers and warning boards. Compared with the prior art, the invention has the following beneficial effects:
according to the technical scheme, the intelligent protection warning method for the transformer substation based on the Internet of things is provided, so that the operation safety and the operation efficiency are improved. Firstly, mounting protection warning devices in a transformer substation, and connecting each protection warning device with a transformer substation operation and control workstation in a signal mode; then, the transformer substation control workstation displays the running state of each protection warning device, and transmits a control instruction to each protection warning device through the signal transmission control mainboard according to the transformer substation remote signaling information; after receiving the control instruction, a motor controller of the protection warning device controls the electric push rod to act; meanwhile, an angle sensor arranged on the electric push rod sends a real-time angle signal to the motor controller, and the motor controller adjusts the action speed and the stroke distance of the electric push rod after receiving the angle signal until the requirement of the control instruction is met. By the method, when key positions such as intervals, breakers or isolating switches and the like need maintenance and overhaul, electric power operation workers can control the protection warning device at the corresponding position of the workstation in the transformer substation to operate to a set state so as to realize safe isolation of an operation site, meanwhile, the protection warning device can be set to be a fence or a warning board according to needs, warning signs can be arranged on the side surface of the fence or the warning board so as to remind the operators of operation safety, and meanwhile, irrelevant personnel can be warned not to enter the operation site.
The protection warning device adopts a scissor rack to lift, the main power is an electric push rod, the lifting of the device is controlled by the contraction of the electric push rod, and an angle sensor is bound at the middle part of the electric push rod. The motor controller controls the speed and the travel distance of the motor through the fed back angle information. In the process that the electric push rod ascends from the bottom to the top, the initial speed is the largest, when the electric push rod is fast to the top, namely when a certain distance exists from the set stroke end point, real-time angle information monitored by the electronic gyroscope is fed back to the motor controller, the motor controller gradually decelerates through an algorithm, the speed is the smallest when the electric push rod reaches the top, and then the electric push rod stops. Vice versa, the electric push rod descends from top to bottom, the same principle as described above. The method can effectively reduce the cost, reduce the failure rate, prevent the motor from sudden stop or locked rotor, cause damage to the controller and increase the control accuracy.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1: the invention discloses a transformer substation intelligent protection warning method schematic diagram based on the Internet of things;
FIG. 2: the invention is a structural schematic diagram of a protection warning device in FIG. 1;
FIG. 3: the invention is shown in figure 1, which is a schematic connection diagram of a substation control workstation;
the system comprises a protection warning device 1, a transformer substation control workstation 2, a signal emission control mainboard 3, an electric push rod 4, an angle sensor 5, a host 6, a computer monitoring screen 7, an ascending control button 8, a stopping control button 9, a descending control button 10, a numeral button 11, a base 12, a scissor bracket 13 and a table board 14.
Detailed Description
In order to better understand the present invention, the following examples are further provided to clearly illustrate the contents of the present invention, but the contents of the present invention are not limited to the following examples. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details.
Referring to fig. 1-3, the intelligent protection and warning method for the transformer substation based on the internet of things comprises the following steps:
s1: arranging a protection warning device in the transformer substation, and connecting the protection warning device with a transformer substation operation and control workstation in a signal mode;
s2: the transformer substation control workstation displays the running state of the protection warning device and transmits a control instruction to the protection warning device through the signal transmission control mainboard according to the transformer substation remote signaling information;
s3: after receiving the control instruction, a motor controller of the protection warning device controls the electric push rod to act;
meanwhile, an angle sensor arranged on the electric push rod sends a real-time inclination angle signal of the electric push rod to a motor controller, and the motor controller adjusts the action speed and the stroke distance of the electric push rod after receiving the angle signal until the requirement of the control instruction is met.
The substation control workstation can comprise a data processing workstation, a graphic workstation, a GIS workstation and the like, is responsible for processing and storing received data, and displays the acquired data to a user in a proper form so as to achieve the purpose of monitoring. When an operator sends a remote control command at a workstation, the workstation sends control information to a front-end processor, the control information is converted by the front-end processor and then sent to a field device (see: Quying case. research on telemechanical protocol of a power system and implementation thereof [ D ]. Wuhan university, 2004.)
Referring to fig. 1-3, in the invention, a substation control workstation is provided with a host and a computer monitoring screen connected with the host, the host is connected with an input keyboard, the input keyboard is provided with a rising control key, a stopping control key, a descending control key and a number key, and the computer monitoring screen displays the running state of the protection warning device. The ascending control key is used for inputting an ascending control instruction; the stop control key is used for inputting a stop control instruction; the descending control key is used for inputting a descending control instruction; the number keys are used for inputting specific numerical values, namely the stroke distance of the electric push rod.
Substation remote signaling information (see: shuting. reliability analysis of substation integrated automation system remote signaling information [ J ]. power safety technology, 2011(11): 10-12.) can be classified into hard contact remote signaling and soft message remote signaling 2. The hard contact remote communication quantity is connected with an open-in loop of the interlayer measurement and control device in the modes of primary equipment auxiliary contact, relay signal contact and the like. Such as the alarm signal contact provided by remote-signaling output circuit of switch, knife-switch auxiliary contact, microcomputer protection device, safety automatic device and auxiliary device. The soft message remote communication quantity is characterized in that a microcomputer protection device accesses protection messages of an alarm group, an action group and the like into a protection management machine in a serial communication mode, and the protection messages are converted into a unified protocol to be communicated with an integrated public information workstation. When the number of the protection devices is large, a plurality of protection management machines can be adopted according to the voltage level.
In the invention, the remote signaling information refers to the on/off state information of the circuit breaker or the disconnecting switch, is acquired by the transformer substation monitoring system and is transmitted to the transformer substation control workstation.
The operation state of the protection warning device comprises ascending, stopping and descending, and the operation state can be directly observed through a computer monitoring screen.
The action speed and the stroke distance of the electric push rod are adjusted, and the method comprises the following steps:
when the control instruction is ascending, setting the travel distance of the electric push rod through an input keyboard, controlling the electric push rod to start by the motor controller, and adjusting the speed of the electric push rod within the travel distance from high to low until the electric push rod stops according to the angle information transmitted by the angle sensor; or the like, or, alternatively,
when the control instruction is descending, the travel distance of the electric push rod is set through the input keyboard, the motor controller controls the electric push rod to start, and the speed of the electric push rod is adjusted from high to low within the travel distance according to the angle information transmitted by the angle sensor until the electric push rod stops.
The protection warning device is respectively arranged at the interval, the circuit breaker and the isolating switch mechanism box. The protection warning devices shown in fig. 1 are 3, more protection warning devices can be arranged according to actual needs, and each protection warning device is connected with a transformer substation control workstation through signals.
Referring to fig. 1-3, protection warning device includes lift platform, lift platform includes base, scissors support and mesa, set up electric putter between base and the scissors support, electric putter and angle sensor all with motor controller signal connection, motor controller and signal transmission control mainboard signal connection, signal transmission control mainboard and transformer substation control workstation signal connection.
The signal emission control main board can select a specific model E90-DTU (400 SL 22).
And a fence or a warning board is arranged on the table top. The rail or the warning board can be provided with identification layers with different contents as required, for example: the electric power safety sign expressions such as 'stopping, high-voltage danger', 'forbidding closing, someone working', 'having electric danger' and the like can be seen by workers and irrelevant personnel, and meanwhile, the physical facilities comprise fences and warning boards and can play the roles of warning and forced isolation objectively.
The angle sensor is an electronic gyroscope. The principle of a gyroscope is that the direction in which the axis of rotation of a rotating object points is not changed when not affected by an external force. In the invention, the electronic gyroscope has a wireless communication interface, such as: bluetooth 2.0 and BLE (Low energy/Bluetooth 4.1) for connecting the motor controller for communication connection and signal transmission.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. The intelligent protection warning method of the transformer substation based on the Internet of things is characterized by comprising the following steps: the method comprises the following steps:
s1: arranging a protection warning device in the transformer substation, and connecting the protection warning device with a transformer substation operation and control workstation in a signal mode;
s2: the transformer substation control workstation displays the running state of the protection warning device and transmits a control instruction to the protection warning device through the signal transmission control mainboard according to the transformer substation remote signaling information;
s3: after receiving the control instruction, a motor controller of the protection warning device controls the electric push rod to act; meanwhile, an angle sensor arranged on the electric push rod sends a real-time inclination angle signal of the electric push rod to a motor controller, and the motor controller adjusts the action speed and the stroke distance of the electric push rod after receiving the angle signal until the requirement of the control instruction is met.
2. The intelligent substation protection warning method based on the internet of things of claim 1, characterized in that: the transformer substation control workstation is provided with a host and a computer monitoring screen connected with the host, the host is connected with an input keyboard, the input keyboard is provided with a rising control key, a stopping control key, a falling control key and a digital key, and the computer monitoring screen displays the running state of the protection warning device.
3. The intelligent substation protection warning method based on the internet of things of claim 1, characterized in that: the operation state of the protection warning device comprises ascending, stopping and descending.
4. The intelligent substation protection warning method based on the Internet of things of claim 3, characterized in that: the action speed and the stroke distance of the electric push rod are adjusted, and the method comprises the following steps:
when the control instruction is ascending, setting the travel distance of the electric push rod through an input keyboard, controlling the electric push rod to start by the motor controller, and adjusting the speed of the electric push rod within the travel distance from high to low until the electric push rod stops according to the angle information transmitted by the angle sensor; or the like, or, alternatively,
when the control instruction is descending, the travel distance of the electric push rod is set through the input keyboard, the motor controller controls the electric push rod to start, and the speed of the electric push rod is adjusted from high to low within the travel distance according to the angle information transmitted by the angle sensor until the electric push rod stops.
5. The intelligent substation protection warning method based on the internet of things of claim 1, characterized in that: the protection warning device is respectively arranged at the interval, the circuit breaker and the isolating switch mechanism box.
6. The intelligent substation protection warning method based on the internet of things of claim 1, characterized in that: the protection warning device comprises a lifting platform, the lifting platform comprises a base, a scissor support and a table board, an electric push rod is arranged between the base and the scissor support, the electric push rod and an angle sensor are both in signal connection with a motor controller, the motor controller is in signal connection with a signal emission control main board, and the signal emission control main board is in signal connection with a transformer substation control workstation.
7. The intelligent substation protection warning method based on the Internet of things of claim 6, wherein: and a fence or a warning board is arranged on the table top.
8. The intelligent substation protection warning method based on the Internet of things of claim 1, 6 or 7, wherein: the angle sensor is an electronic gyroscope.
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| CN202010513950.XA CN111585351B (en) | 2020-06-08 | 2020-06-08 | Intelligent protection warning method for transformer substation based on Internet of things |
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| US20160171862A1 (en) * | 2014-12-15 | 2016-06-16 | Saptarshi DAS | Dynamic virtual fencing for a hazardous environment |
| CN206991493U (en) * | 2017-07-20 | 2018-02-09 | 国网安徽省电力公司检修公司 | A kind of intelligent substation fence |
| CN207468100U (en) * | 2017-11-21 | 2018-06-08 | 吴自强 | A kind of lifting platform intelligently consolidated |
| CN208461320U (en) * | 2018-04-28 | 2019-02-01 | 陆丹丹 | A kind of electric power overhaul bracket |
| CN108979310A (en) * | 2018-09-11 | 2018-12-11 | 国网山东省电力公司莱芜供电公司 | A kind of security enclosure of transforming plant arrangement system |
| CN210597092U (en) * | 2019-07-29 | 2020-05-22 | 重庆科技学院 | Night warning board for safety engineering |
| CN210429170U (en) * | 2019-11-28 | 2020-04-28 | 云南万控电力工程有限公司 | Warning board for transformer substation |
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| CN111585351B (en) | 2022-11-08 |
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