CN208368861U - A kind of storage pole-mounted circuit breaker power distribution automation transformation air plug conversion equipment - Google Patents

A kind of storage pole-mounted circuit breaker power distribution automation transformation air plug conversion equipment Download PDF

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Publication number
CN208368861U
CN208368861U CN201820805459.2U CN201820805459U CN208368861U CN 208368861 U CN208368861 U CN 208368861U CN 201820805459 U CN201820805459 U CN 201820805459U CN 208368861 U CN208368861 U CN 208368861U
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pin
aviation
aviation plug
plug
module
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CN201820805459.2U
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潘建兵
徐在德
曹蓓
刘洋
范瑞祥
李升健
王华云
郑蜀江
安义
蔡木良
李博江
刘蓓
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Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
State Grid Corp of China SGCC
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Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
State Grid Corp of China SGCC
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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
    • 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
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission

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  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

一种存量柱上断路器配电自动化改造航插转换装置，包括电源指示灯（5）、运行状态指示灯（6）、22芯航空插座、26芯航空插座、6芯航空插座（9）、10芯航空插座（10）、34芯外置端子排、内部34芯转换模块、标准6芯防开路电流航空插头、10芯航空插头、防雷模块、通信模块、电池管理模块和装置壳体。柱上断路器通过航空插头连接线连接航插转换装置；航插转换装置通过航空插头连接线连接FTU，以实现航空插头转换。本实用新型通过外置航插转换装置实现对现存柱上断路器配电自动化改造要求和装置运行状态的在线监测，内部结构具备灵活调整的功能，满足任何厂家、型号、批次的存量柱上断路器配电自动化改造，提升配电自动化覆盖及应用水平。

An aviation plug conversion device for automatic transformation of power distribution of a circuit breaker on a stock column, comprising a power indicator light (5), a running status indicator light (6), a 22-core aviation socket, a 26-core aviation socket, a 6-core aviation socket (9), 10-pin aviation socket (10), 34-pin external terminal block, internal 34-pin conversion module, standard 6-pin anti-open-circuit current aviation plug, 10-pin aviation plug, lightning protection module, communication module, battery management module and device housing. The circuit breaker on the column is connected to the aviation plug conversion device through the aviation plug connection line; the aviation plug conversion device is connected to the FTU through the aviation plug connection wire to realize the aviation plug conversion. The utility model realizes the on-line monitoring of the existing on-column circuit breaker power distribution automation transformation requirements and the device operation state through the external aerial plug conversion device, and the internal structure has the function of flexible adjustment, which can meet the requirements of any manufacturer, model, batch of existing on-column on-column Circuit breaker distribution automation transformation to improve distribution automation coverage and application level.

Description

A kind of storage pole-mounted circuit breaker power distribution automation transformation air plug conversion equipment
Technical field
The utility model relates to a kind of storage pole-mounted circuit breaker power distribution automations, and aviation plug conversion equipment is transformed, and belong to distribution Automate O&M technical field.
Background technique
Live distribution terminal mainly passes through the communication modes such as optical fiber, wireless network access electrical power distribution automatization system, due to mesh Relatively weak and hacker attack means the enhancing of preceding safety prevention measure, causes multi-point and wide-ranging, widely distributed distribution automatic Change network attack risk of the systems face from public network or private network, and then influence safe and reliable power supply of the distribution system to user, Meanwhile there is new variation in current international security situation, attacker, which exists, reports the modes such as fault message by mistake by distribution terminal Twisting attack main website in turn results in larger range of security threat.
Power distribution automation main station system of new generation and terminal are proposed according to State Grid Corporation of China, it is no matter logical using which kind of Letter mode all should carry out security protection using two-way authentication and the encryption and decryption technology based on symmetric key.And currently, 2017 it The monitoring device of preceding pole-mounted circuit breaker configuration does not have hardware encryption module, and storage pole-mounted circuit breaker last decade puts into operation number Measure it is more, be meet country to protecting information safety, equipment investment maximizing the benefits, the requirement of intelligent distribution network, it is necessary to open Open up the transformation of storage pole-mounted circuit breaker power distribution automation；At the same time, it is secondary to be directed to pole-mounted circuit breaker in 2017 for State Grid Corporation of China Wiring port and feed line automatization terminal (hereinafter referred to as FTU) aviation plug are standardized definition, specify pole-mounted circuit breaker 26 core of secondary connection port, power input and the definition of 6 core pin of voltage interface (JD) and wiring requirement, electric current input interface (ID) The definition of 6 core pins and wiring requirement, control, the definition of 10 core pin of signaling interface (CD) and wiring requirement, but before 2017 FTU or controller do not have normalized by definition, and existing aviation plug standard and existing apparatus interface will be caused not corresponding, lead to nothing Method carries out power distribution automation transformation to existing apparatus, cannot achieve the switch operating status power distribution automation main station system and supervises online It surveys.
Therefore, it is necessary to be directed to status, a kind of pole-mounted circuit breaker power distribution automation transformation suitable for present situation is provided Aviation plug conversion equipment, meet any producer, model, batch storage pole-mounted circuit breaker power distribution automation transformation require, It realizes switch operating status power distribution automation main station system on-line monitoring, it is horizontal to improve power distribution network intellectual monitoring.
Summary of the invention
The purpose of this utility model is, in order to realize that storage on-pole switch operating status accesses power distribution automation master of new generation System of standing improves power distribution network intelligence water convenient for monitoring on-line to electric informations such as switch operating status, route operating conditions It is flat, propose a kind of storage pole-mounted circuit breaker power distribution automation transformation air plug conversion equipment.
The technical solution of the utility model is a kind of storage pole-mounted circuit breaker power distribution automation transformation air plug conversion equipment packet It is external to include running LED, 22 core aviation sockets, 26 core aviation sockets, 6 core aviation sockets, 10 core aviation sockets, 34 cores Terminal block, internal 34 core conversion modules, the anti-open-circuit current aviation plug of 6 core of standard, 10 core aviation plugs, lightning-protection module, communication Module, battery management module and device housing.
Described device shell is a rectangular parallelepiped structure, and mounting arrangements have power supply indicator and operation to refer on the case panel Show that lamp, power supply indicator are arranged in the upper left corner of panel, row's run indicator is evenly arranged the lower section for being arranged in panel；It is described 22 core aviation sockets and 26 core aviation sockets are mounted in the shell side plate on the panel left side；The 6 core aviation socket of standard and 10 Core aviation socket is mounted in the shell side plate on the right；The external terminal block of 34 core is mounted on the side plate above panel；6 cores Anti- open-circuit current aviation plug, 10 core aviation plugs, internal 34 core conversion modules, lightning-protection module, communication module and battery management Module is mounted in device housing；The anti-open-circuit current aviation plug of 6 cores and 10 core aviation plugs pass through tie jumper and inside 34 The connection of core conversion module.
Pole-mounted circuit breaker connects air plug conversion equipment by aviation plug connecting line；Air plug conversion equipment passes through aviation plug Connecting line connects FTU, to realize that aviation plug is converted.
The 34 core conversion module of inside includes 1 road input terminal and 2 groups of output ends, and input terminal is inserted with 22 core aviations respectively The external terminal block connection of seat, 26 core aviation sockets, 34 cores, output end have 2 groups, every group include the anti-open-circuit current aviation plug of 6 cores, 10 core aviation plugs；Between input terminal and output end by wire jumper connect, input terminal pin definition be not fixed, output end stitch by Standard pin definition is fixed.
The running LED divides two states, and when internal conversion module output end is connected, the terminal is corresponding to be run Status lamp is bright；When internal conversion module output end access failure, which corresponds to operating status lamp and goes out；The longevity is used to extend battery Life, running LED can define self-setting according to user, recommend primary every flashing in 10 seconds.
The lightning-protection module detects lightning current when device, and the quick acting of lightning protection circuit, limit value voltage is in 400V or less.
The battery management module contains non-charging battery, voltage control unit, a power supply operation indicator, non-charging electricity Pond is the power supply of conversion equipment, and capacity requires personalized customization according to user, and the flashing of power supply operation indicator green light is Normally, blinking red lamp is abnormal.
The communication module provides wireless and serial communication, supports 4G, 3G, 2G, can be cut automatically according to on-site signal intensity It changes.Device operating status can be connected directly by serial ports and FTU, be uploaded to power distribution automation main station system indirectly, or pass through Wireless module is directly uploaded to power distribution automation main station system.
When in-site installation, if switch-side aviation plug is 26 or 22 cores, corresponding external 26 or 22 core boat can be directly accessed Dummy receptacle；If switch-side aviation plug is not 26 cores or 22 cores, aviation plug can be opened and be connected in the external terminal block of 34 cores.
The utility model has the beneficial effects that being realized to existing pole-mounted circuit breaker distribution certainly by external air plug conversion equipment Dynamicization, which is transformed, wants the on-line monitoring of summing unit operating status, and internal structure has the function being adjusted flexibly, meet any producer, The storage pole-mounted circuit breaker power distribution automation transformation of model, batch, promotes power distribution automation covering and application level.
The utility model is suitable for the storage pole-mounted circuit breaker power distribution automation transformation of any producer, model, batch.
Detailed description of the invention
Fig. 1 is that air plug conversion equipment and switch, FTU are connected schematic diagram；
Fig. 2 is figure above air plug conversion equipment；
Fig. 3 is air plug conversion equipment left hand view；
Fig. 4 is air plug conversion equipment right part of flg；
Fig. 5 is air plug conversion equipment internal terminal layout drawing；
Fig. 6 is figure on rear side of air plug conversion equipment；
In figure, 1 is pole-mounted circuit breaker；2 be aviation plug connecting line；3 be air plug conversion equipment；4 be FTU；5 refer to for power supply Show lamp；6 be running LED；7 be 22 core aviation sockets；8 be 26 core aviation sockets；9 be 6 core aviation sockets；10 be 10 Core aviation socket；11 be tie jumper；12 be the anti-open-circuit current aviation plug of 6 cores；13 be 10 core aviation plugs；14 is outside 34 cores Set terminal block.
Specific embodiment
Specific embodiment of the present utility model is as shown in the figure.
A kind of the present embodiment storage pole-mounted circuit breaker power distribution automation transformation air plug conversion equipment include power supply indicator 5, Running LED 6,22 core aviation sockets 7,26 core aviation sockets 8,6 core aviation sockets 9,10 core aviation sockets 0, outside 34 cores Set terminal block 14, internal 34 core conversion modules, the anti-open-circuit current aviation plug 12 of 6 core of standard, 10 core aviation plugs 13, lightning protection mould Block, communication module, battery management module and device housing.
Described device shell is a rectangular parallelepiped structure, and mounting arrangements have power supply indicator 5 and operation on the case panel Indicator light 6, power supply indicator 5 are arranged in the upper left corner of panel, and row's run indicator 6, which is evenly arranged, to be arranged under panel Side；The 22 core aviation socket 7 and 26 core aviation sockets 8 are mounted in the shell side plate on the panel left side；The 6 core aviation of standard The core of socket 9 and 10 aviation socket 10 is mounted in the shell side plate on the right；The external terminal block 14 of 34 core is mounted on panel On the side plate of side；The anti-open-circuit current aviation plug 12 of 6 cores, 10 core aviation plugs 13, internal 34 core conversion modules, lightning-protection module, Communication module and battery management module are mounted in device housing；The anti-core aviation plug of open-circuit current aviation plug 12 and 10 of 6 cores 13 are arranged in a row, internal 34 core conversion modules and the anti-core aviation plug of open-circuit current aviation plug 12 and 10 of 6 cores being arranged in a row 13 arranged parallels；The anti-core of open-circuit current aviation plug 12 and 10 aviation plug 13 of 6 cores is turned by tie jumper 11 and internal 34 cores Change the mold block connection.
34 core conversion module of inside in the present embodiment includes 1 road input terminal and 2 groups of output ends, input terminal respectively with 22 cores The external terminal block connection 14 of aviation socket 7,26 core aviation sockets 8,34 cores, output end have 2 groups, and every group includes the anti-open circuit electricity of 6 cores Flow aviation plug, 10 core aviation plugs；Between input terminal and output end by wire jumper connect, input terminal pin definition be not fixed, Output end stitch is fixed by standard pin definition.
Running LED in the present embodiment divides two states, when the connection of internal conversion module output end, the terminal Corresponding operating status lamp is bright；When internal conversion module output end access failure, which corresponds to operating status lamp and goes out；To extend battery Service life, running LED can define self-setting according to user, recommend primary every flashing in 10 seconds.
Lightning-protection module in the present embodiment is when device detection lightning current, and the quick acting of lightning protection circuit, limit value voltage is in 400V Below.
Battery management module in the present embodiment contains non-charging battery, voltage control unit, a power supply operation indicator, Non-charging battery is the power supply of conversion equipment, and capacity requires personalized customization, power supply operation instruction 5 lamps point according to user Normally (green light flashing), abnormal (blinking red lamp).
Communication module in the present embodiment provides wireless and serial communication, supports 4G, 3G, 2G, can be strong according to on-site signal Degree automatically switches.Device operating status can be connected directly by serial ports and FTU, be uploaded to power distribution automation main station system indirectly, Or power distribution automation main station system is directly uploaded to by wireless module.

Claims (6)

1.一种存量柱上断路器配电自动化改造航插转换装置，其特征在于，所述装置包括运行状态指示灯、22芯航空插座、26芯航空插座、6芯航空插座、10芯航空插座、34芯外置端子排、内部34芯转换模块、标准6芯防开路电流航空插头、10芯航空插头、防雷模块、通信模块、电池管理模块和装置壳体；1. an air plug conversion device for automatic transformation of power distribution of circuit breakers on a stock column, it is characterized in that, described device comprises operating status indicator light, 22 core aviation sockets, 26 core aviation sockets, 6 core aviation sockets, 10 core aviation sockets , 34-pin external terminal block, internal 34-pin conversion module, standard 6-pin anti-open-circuit current aviation plug, 10-pin aviation plug, lightning protection module, communication module, battery management module and device housing; 所述装置壳体为一长方体结构，所述壳体面板上安装布置有电源指示灯和运行指示灯，电源指示灯布置在面板的左上角，一排运行指示灯均匀布置排列在面板的下方；所述22芯航空插座和26芯航空插座安装在面板左边的壳体侧板上；所述标准6芯航空插座和10芯航空插座安装在右边的壳体侧板上；所述34芯外置端子排安装在面板上方的侧板上；6芯防开路电流航空插头、10芯航空插头、内部34芯转换模块、防雷模块、通信模块和电池管理模块安装在装置壳体内；6芯防开路电流航空插头和10芯航空插头通过连接跳线与内部34芯转换模块连接；The device casing is a cuboid structure, and a power indicator light and a running indicator light are installed and arranged on the casing panel, the power indicator light is arranged in the upper left corner of the panel, and a row of running indicator lights is evenly arranged below the panel; The 22-pin aviation socket and the 26-pin aviation socket are installed on the shell side plate on the left side of the panel; the standard 6-pin aviation socket and the 10-pin aviation socket are installed on the right shell side board; the 34-pin external The terminal block is installed on the side plate above the panel; the 6-pin anti-open-circuit current aviation plug, the 10-pin aviation plug, the internal 34-pin conversion module, the lightning protection module, the communication module and the battery management module are installed in the device shell; 6-pin anti-open circuit The current aviation plug and the 10-pin aviation plug are connected with the internal 34-pin conversion module through the connecting jumper; 柱上断路器通过航空插头连接线连接航插转换装置；航插转换装置通过航空插头连接线连接FTU，以实现航空插头转换。The circuit breaker on the column is connected to the aviation plug conversion device through the aviation plug connection line; the aviation plug conversion device is connected to the FTU through the aviation plug connection wire to realize the aviation plug conversion. 2.根据权利要求1所述的一种存量柱上断路器配电自动化改造航插转换装置，其特征在于，所述运行状态指示灯分两种状态，当内部转换模块输出端接通，该端子对应运行状态灯亮；当内部转换模块输出端未接通，该端子对应运行状态灯灭。2. The aerial plug conversion device for automatic transformation of power distribution of a circuit breaker on a stock column according to claim 1, wherein the operating status indicator light is divided into two states, and when the output end of the internal conversion module is turned on, the The corresponding running status light of the terminal is on; when the output terminal of the internal conversion module is not connected, the corresponding running status light of the terminal is off. 3.根据权利要求1所述的一种存量柱上断路器配电自动化改造航插转换装置，其特征在于，所述内部34芯转换模块包括1路输入端和2组输出端，输入端分别与22芯航空插座、26芯航空插座、34芯外置端子排连接，输出端有2组，每组包括6芯防开路电流航空插头、10芯航空插头；输入端和输出端之间通过跳线连接，输入端引脚定义不固定、输出端针脚按标准引脚定义固定。3. The aerial plug conversion device for automatic transformation of power distribution of circuit breakers on a stock column according to claim 1, wherein the internal 34-core conversion module comprises 1 input end and 2 groups of output ends, and the input ends are respectively It is connected with 22-pin aviation socket, 26-pin aviation socket, and 34-pin external terminal block. There are 2 groups of output terminals, each group includes 6-pin anti-open-circuit current aviation plug, 10-pin aviation plug; Line connection, the input pin definition is not fixed, and the output pin is fixed according to the standard pin definition. 4.根据权利要求1所述的一种存量柱上断路器配电自动化改造航插转换装置，其特征在于，所述防雷模块当装置检测雷电流，防雷回路快速动作，限值电压在400V以下。4. The air-plug conversion device for automatic transformation of power distribution of circuit breakers on a stock column according to claim 1, characterized in that, when the lightning protection module detects lightning current, the lightning protection circuit acts quickly, and the limit voltage is at Below 400V. 5.根据权利要求1所述的一种存量柱上断路器配电自动化改造航插转换装置，其特征在于，所述电池管理模块包括一个非充电电池、电压控制单元、电源运行指示灯；非充电电池为转换装置的供电电源，其容量根据用户要求个性化定制，电源运行指示灯绿灯闪烁为正常，红灯闪烁为异常。5. The aerial plug conversion device for power distribution automation transformation of a circuit breaker on an inventory column according to claim 1, wherein the battery management module comprises a non-rechargeable battery, a voltage control unit, and a power supply running indicator light; The rechargeable battery is the power supply of the conversion device, and its capacity is customized according to the user's requirements. The green light of the power running indicator is normal, and the red light is abnormal. 6.根据权利要求1所述的一种存量柱上断路器配电自动化改造航插转换装置，其特征在于，所述通信模块提供无线和串口通信，支持4G、3G、2G，根据现场信号强度自动切换；装置运行状态通过串口与FTU直接相连，间接上传给配电自动化主站系统，或是通过无线模块直接上传给配电自动化主站系统。6. The aerial plug conversion device for automatic transformation of power distribution of a circuit breaker on a stock column according to claim 1, wherein the communication module provides wireless and serial communication, supports 4G, 3G, and 2G, according to on-site signal strength Automatic switching; the operating status of the device is directly connected to the FTU through the serial port, and is indirectly uploaded to the distribution automation master station system, or directly uploaded to the distribution automation master station system through the wireless module.
CN201820805459.2U 2018-05-29 2018-05-29 A kind of storage pole-mounted circuit breaker power distribution automation transformation air plug conversion equipment Active CN208368861U (en)

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* Cited by examiner, † Cited by third party
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CN110967530A (en) * 2019-10-15 2020-04-07 国网山东省电力公司电力科学研究院 A fully automatic wire insertion device with a depth probe
CN111224337A (en) * 2020-03-27 2020-06-02 保定市冀能电力自动化设备有限公司 Distribution automation interface control box
CN111613994A (en) * 2020-06-04 2020-09-01 贵州电网有限责任公司 Universal transfer box for distribution network automation terminal on column
CN114914874A (en) * 2022-06-07 2022-08-16 国网冀北电力有限公司唐山供电公司 Feeder terminal relay terminal box and installation method
CN115832800A (en) * 2022-11-22 2023-03-21 广东电网有限责任公司 An aerial plug-in conversion device for power distribution automation transformation of pole-mounted circuit breakers

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110967530A (en) * 2019-10-15 2020-04-07 国网山东省电力公司电力科学研究院 A fully automatic wire insertion device with a depth probe
CN110967530B (en) * 2019-10-15 2021-10-08 国网山东省电力公司电力科学研究院 A method of using a fully automatic wire insertion device with a depth probe
CN111224337A (en) * 2020-03-27 2020-06-02 保定市冀能电力自动化设备有限公司 Distribution automation interface control box
CN111613994A (en) * 2020-06-04 2020-09-01 贵州电网有限责任公司 Universal transfer box for distribution network automation terminal on column
CN114914874A (en) * 2022-06-07 2022-08-16 国网冀北电力有限公司唐山供电公司 Feeder terminal relay terminal box and installation method
CN114914874B (en) * 2022-06-07 2023-11-07 国网冀北电力有限公司唐山供电公司 Feeder terminal relay terminal box and installation method
CN115832800A (en) * 2022-11-22 2023-03-21 广东电网有限责任公司 An aerial plug-in conversion device for power distribution automation transformation of pole-mounted circuit breakers

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