CN112820054A - Transformer substation enclosure monitoring system - Google Patents

Transformer substation enclosure monitoring system Download PDF

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Publication number
CN112820054A
CN112820054A CN202110286224.3A CN202110286224A CN112820054A CN 112820054 A CN112820054 A CN 112820054A CN 202110286224 A CN202110286224 A CN 202110286224A CN 112820054 A CN112820054 A CN 112820054A
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CN
China
Prior art keywords
module
transformer substation
enclosure
monitoring system
main control
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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
CN202110286224.3A
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Chinese (zh)
Inventor
郑彬
郑永刚
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Hebei Guohua Safety Technology Engineering Co ltd
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Hebei Guohua Safety Technology Engineering 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.)
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Publication date
Application filed by Hebei Guohua Safety Technology Engineering Co ltd filed Critical Hebei Guohua Safety Technology Engineering Co ltd
Priority to CN202110286224.3A priority Critical patent/CN112820054A/en
Publication of CN112820054A publication Critical patent/CN112820054A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00Burglar, theft or intruder alarms
    • G08B13/18Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00Burglar, theft or intruder alarms
    • G08B13/18Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/181Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
    • G08B13/183Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B15/00Identifying, scaring or incapacitating burglars, thieves or intruders, e.g. by explosives
    • G08B15/005Identifying, scaring or incapacitating burglars, thieves or intruders, e.g. by explosives by electric shock

Abstract

The application relates to a transformer substation enclosure monitoring system which comprises a video acquisition module, a monitoring module and a monitoring module, wherein the video acquisition module is used for acquiring operation videos of main equipment in a transformer substation and video information outside the transformer substation enclosure; the electronic fence module is arranged at the upper part of the transformer substation enclosure wall; the main control module is used for receiving the video information output by the video acquisition module and outputting pulse voltage to the electronic fence module; and the transmission network module is connected to the main control module and is used for transmitting the video information to the mobile terminal. The video acquisition module comprises a high-definition camera and an infrared camera, and the high-definition camera is arranged on an enclosure wall of the transformer substation and is used for acquiring video information outside the enclosure wall; the infrared camera is used for monitoring main equipment in the transformer substation. The intelligent protection system has the effect of improving the intelligent degree and the protection level of the transformer substation.

Description

Transformer substation enclosure monitoring system
Technical Field
The application relates to the technical field of monitoring, in particular to a transformer substation enclosure monitoring system.
Background
The transformer substation is a place for converting voltage and current, receiving electric energy and distributing electric energy in an electric power system. With the digitalization, informatization and intellectualization of substation equipment, more and more advanced technologies are applied to intelligent substations to realize the functions of automatically completing information acquisition, measurement, control, protection metering, detection and the like, so that the method is very important for the safety protection measures of the substations.
However, the existing transformer substation still needs long-term operation of workers, so that irrelevant personnel are prevented from entering and exiting the transformer substation, and accidents that the equipment in the transformer substation is damaged and operation safety is caused by the irrelevant personnel are reduced. Therefore, the degree of automation of the substation needs to be further increased.
Disclosure of Invention
In order to improve the intelligent degree and the protection level of a transformer substation and avoid the working requirement that a worker stays in the transformer substation for a long time, the application provides a transformer substation enclosure monitoring system.
The application provides a transformer substation enclosure monitored control system, its technical scheme who adopts as follows:
a substation enclosure monitoring system comprising:
the video acquisition module is used for acquiring operation videos of main equipment in the transformer substation and video information outside the transformer substation enclosure;
the electronic fence module is used for shielding the upper part of the transformer substation enclosure;
the main control module is used for receiving the video information output by the video acquisition module and outputting pulse voltage to the electronic fence module;
and the transmission network module is connected to the main control module and is used for transmitting the video information to the mobile terminal.
By adopting the technical scheme, in the operation process of the transformer substation, the operation condition of main equipment in the transformer substation is continuously acquired through the video acquisition module, image information outside the enclosure of the transformer substation is acquired simultaneously to judge the image information, whether abnormal conditions exist in the image information is judged through the main control module, related responsible persons can also be connected to the main control module through the mobile terminal and the transmission network module, the video information transmitted by the video acquisition module is remotely monitored, and the working requirement that a worker stays in the transformer substation is avoided; meanwhile, the electronic fence module can shield the upper part of the enclosure of the transformer substation, and safety accidents caused by the fact that personnel cross the enclosure of the transformer substation through the wall turning head are prevented.
Optionally, the video acquisition module comprises a high-definition camera and an infrared camera, and the high-definition camera is arranged on an enclosure of the transformer substation and is used for acquiring video information outside the enclosure; the infrared camera is used for monitoring main equipment in the transformer substation.
By adopting the technical scheme, the high-definition camera can collect the picture outside the enclosure wall, and can record the behavior of an illegal invader when the illegal invader exists; the setting of infrared camera can carry out real-time detection to the equipment in the transformer substation, and equipment in the transformer substation is because contact failure, deposition, equipment are ageing appear striking an arc or after the condition of generating heat, and the record is carried out to the infrared camera of accessible to confirm that there is the concrete position of potential safety hazard.
Optionally, the electronic fence module includes a front-end detection fence and a pulse transmitting unit, and the pulse transmitting unit is configured to continuously transmit an extra-high voltage pulse signal not lower than 5 kv to the front-end detection fence.
By adopting the technical scheme, the pulse transmitting unit can output high-voltage pulse voltage to the electronic fence module arranged at the upper part of the transformer substation fence, and lawbreakers can release high-voltage electric pulses after touching the electronic fence so as to retreat invaders and apply deterrence force to lawbreakers turning over the wall head; the front end detection fence is a metal conductor which is connected to the pulse transmitting unit and is used for keeping the front end detection fence connected with a high-voltage pulse signal continuously.
Optionally, the main control module includes a data processing unit and a discharge detection unit, where the data processing unit is configured to receive a video signal and analyze whether an abnormal condition exists in a video; the discharge detection unit is used for detecting the discharge time point and the discharge times of the front-end detection fence and transmitting the detected data to the main control module.
By adopting the technical scheme, the data processing unit is used for analyzing the received video information so as to judge whether the operating equipment in the transformer substation is abnormal or not through the video; the discharge detection unit is used for detecting the discharge times and the discharge time points of the front end detection fence, and records are formed so that relevant workers can trace the discharge reasons.
Optionally, the system further comprises an active infrared intrusion detector and an alarm module, wherein the active infrared intrusion detector is arranged outside the transformer substation enclosure.
By adopting the technical scheme, the infrared intrusion detector is arranged outside the enclosing wall of the transformer substation, and can warn personnel who trigger the infrared intrusion detector, so that the personnel can be prevented from being impacted by high-voltage pulse under the unknown condition; the warning module is used for sending warning prompt information through the warning module after the active infrared intrusion detector 5 detects that the personnel are close to the transformer substation enclosure, and is used for reminding the personnel close to the transformer substation enclosure to evacuate in time, so that the effect of frightening is achieved, and illegal personnel are prevented from further turning over the enclosure to invade into the transformer substation.
Optionally, the warning module includes an audio output device and a warning light.
By adopting the technical scheme, the audio output device is used for outputting prompt voice or alarm sound to prompt an intruder; the warning lamp is used for emitting warning light and plays a role in frightening.
Optionally, the mobile terminal further comprises a communication module, wherein the communication module is connected to the main control module and is used for sending a prompt short message to the corresponding mobile terminal after the main control module judges that the video information has an abnormality and/or the front-end detection fence has a discharge phenomenon.
By adopting the technical scheme, the communication module is used for sending out the prompt short message, so that related workers can remotely receive the prompt message of the short message, and can be connected to the main control module through the transmission network so as to remotely check the video image information shot by each detection data and the video acquisition module, and the phenomenon that the influence range and the severity of an accident are enlarged due to unattended operation when an abnormal condition occurs in a transformer substation is avoided.
Optionally, the main control module further includes a delay unit, configured to enable the alarm module to continuously send out the alarm signal within a preset time period.
By adopting the technical scheme, the time delay unit is arranged and used for controlling the working time of the alarm module, and automatically disconnecting the time delay unit after the alarm signal is sent and continues for the preset time period, so that the phenomenon that the alarm module continuously works for alarming is avoided.
Optionally, the transformer substation further comprises an identity recognition module and a driving module, wherein the identity recognition module is used for recognizing personnel information entering the transformer substation, the personnel identity is matched with preset personnel information, and then the driving module outputs a driving signal to open a door panel of the transformer substation.
By adopting the technical scheme, when relevant responsible persons are about to enter the transformer substation, the identity of the current personnel can be identified through the identity identification module, the gate of the transformer substation can be opened through the driving module after the identification is successful, and prompt and driving-away information is sent out when the identification is failed.
Optionally, the main control module further includes a controller for remotely controlling the shooting angle of the high definition camera and/or the infrared camera.
By adopting the technical scheme, when relevant workers receive the prompt short message, the video information output by the video acquisition module is checked through the network transmission module, and meanwhile, the control instruction is output to the controller through the network transmission module so as to control the high-definition camera and the infrared camera to rotate to different angles, so that the wide positions can be checked.
In summary, the present application includes at least one of the following beneficial technical effects:
1. in the operation process of the transformer substation, the operation condition of main equipment in the transformer substation is continuously acquired through the video acquisition module, image information outside a transformer substation enclosure is acquired simultaneously to judge the image information, whether abnormal conditions exist in the image information is judged through the main control module, related responsible persons can also be connected to the main control module through the mobile terminal and the transmission network module, the video information transmitted by the video acquisition module is remotely monitored, and the working requirement that a worker stays in the transformer substation is avoided; meanwhile, the electronic fence module can shield the upper part of the enclosure wall of the transformer substation, so that safety accidents caused by personnel crossing the enclosure wall of the transformer substation through the wall turning head are prevented;
2. the pulse transmitting unit can output high-voltage pulse voltage to an electronic fence module arranged on the upper portion of a transformer substation enclosure, and lawbreakers can emit high-voltage electric pulses after touching the electronic fence so as to retreat intruders, so that deterrent force is exerted on intruders turning over the wall, and safe operation of equipment in the transformer substation is guaranteed.
Drawings
Fig. 1 is a system block diagram provided in an embodiment of the present application.
Description of reference numerals: 1. a video acquisition module; 11. a high-definition camera; 12. an infrared camera; 2. an electronic fence module; 21. a front end detection fence; 22. a pulse transmitting unit; 3. a main control module; 31. a data processing unit; 32. a discharge detection unit; 33. a controller; 4. a transmission network module; 41. a communication module; 5. an infrared intrusion detector; 6. an alarm module; 61. an audio output device; 62. a warning light; 63. a delay unit; 7. an identity recognition module; 71. and a driving module.
Detailed Description
The present application is described in further detail below with reference to the attached drawings.
The embodiment of the application discloses transformer substation enclosure monitoring system. Referring to fig. 1, the system includes a video capture module 1, an electronic fence module 2, a main control module 3, a transmission network module 4, and a cloud server. The video acquisition module 1 is used for acquiring operation videos of main equipment in the transformer substation and video information outside a transformer substation enclosure; the electronic fence module 2 is used for shielding the upper part of the transformer substation enclosure wall and preventing an intruder from entering the transformer substation through the transformer substation enclosure wall to cause an accident; the main control module 3 is used for receiving the video information output by the video acquisition module 1 and outputting pulse voltage to the electronic fence module 2; the transmission network module 4 is used for transmitting the video information to the cloud server, and the relevant responsible person can check the video content on the cloud server through the mobile terminal.
Specifically, the video acquisition module 1 comprises at least four high-definition cameras 11 and infrared cameras 12, wherein the high-definition cameras 11 are fixedly arranged at four corners of a transformer substation enclosure respectively, the high-definition cameras 11 face the outside of the transformer substation enclosure and are used for acquiring and recording images or video information outside the enclosure, the high-definition cameras 11 can acquire images outside the enclosure, and when illegal intruders exist, behaviors of the illegal intruders can be recorded; the infrared camera 12 is arranged inside the transformer substation and faces each main device in the transformer substation to detect the operating temperature of the relevant device in real time. The setting of infrared camera 12 can carry out real-time detection to the equipment in the transformer substation, and equipment in the transformer substation is because contact failure, deposition, equipment ageing appear striking an arc or behind the condition of generating heat, and accessible infrared camera 12 takes notes to confirm the concrete position that has the potential safety hazard.
The electronic fence module 2 comprises a front end detection fence and a pulse transmitting unit 22, wherein the front end detection fence comprises a plurality of exposed wires, and a warning board is hung on the wires; the wire sets firmly in the upper portion of transformer substation's enclosure and encloses into the protection perimeter, and front end detection rail is connected to on the pulse transmitting unit 22, and pulse transmitting unit 22 sends high-voltage pulse signal to front end detection rail all the time, and the intruder touches front end detection rail after, can release high-voltage pulse to the intruder and hit the intruder, delays its invasion time or makes it give up the invasion action to do not threaten people's sexual life.
The main control module 3 comprises a data processing unit 31 and a discharge detection unit 32, wherein the data processing unit 31 is used for receiving video signals and analyzing whether an abnormal condition exists in the video; the discharge detection unit 32 is configured to detect the number of discharges and the discharge time point of the front-end detection fence 21, upload the picture taken by the high-definition camera 11 at that time to the cloud server through the transmission network, and transmit the taken picture to the cloud server through the transmission network when the data processing unit 31 detects that the temperature point in the picture of the infrared camera 12 is abnormal.
Further, the system also comprises an active infrared intrusion detector 5 and an alarm module 6, wherein the active infrared intrusion detector 5 can be a plurality of groups of infrared correlation detectors, is arranged outside the transformer substation enclosure and is not less than 1.8 meters away from the ground. The infrared ray that infrared correlation detector sent is parallel with the transformer substation enclosure, and is the horizontality. Like this, have the pedestrian can not miss when walking at transformer substation's enclosure angle department and touch infrared correlation detector, when someone upwards scrambles outside the enclosure, can trigger initiative infrared intrusion detector 5 to with trigger signal transmission to warning module 6. The alarm module 6 comprises an audio output device 61 and a warning light 62, wherein the audio output device 61 can be any sound box, loudspeaker and other equipment capable of receiving audio signals and converting the audio signals into sound; the warning light 62 may be a flashing light or a searchlight that can illuminate. When the active infrared intrusion detector 5 sends a trigger signal and sends the trigger signal to the alarm module 6, the audio output device 61 can output voice information to remind the user of keeping away from the transformer substation enclosure wall, and meanwhile, the indicator lamp sends out light warning information to play a role of deterrence. The alarm module 6 further comprises a delay unit 63 configured to stop working after the alarm module 6 sends the alarm information and continues for a certain period of time. The interference phenomenon that the alarm module 6 continuously works to send out alarm sound is avoided.
Further, the system further comprises a communication module 41 connected to the main control module 3. After the main control module 3 judges that an abnormal condition exists in the video information and/or the front-end detection fence 21 has a discharge phenomenon, the communication module 41 can automatically edit corresponding text prompt information and send the text prompt information to a mobile terminal of a preset related responsible person in a short message mode, so that the responsible person can remotely receive the prompt information of the short message and can be connected to the main control module 3 through a transmission network to remotely check each detection data and video image information shot by the video acquisition module 1, and the problem that when the transformer substation has an abnormal condition, the influence range and the severity of an accident are enlarged due to unattended operation is avoided. The relevant responsible person can also be connected to the cloud server through the mobile terminal, and the video information in the fixed time period before and after the alarm sending time point is checked, so that the reason for sending the alarm or the reason for discharging is traced.
Further, the system further comprises an identity recognition module 7 and a driving module 71, wherein the identity recognition module 7 can be one or more of a face recognition device, a fingerprint recognition device, a coded lock device and/or an access control device and is used for recognizing personnel information to be entered into the transformer substation, the personnel identity is matched with preset personnel information, the driving module 71 outputs a driving signal to open a door panel of the transformer substation, and prompt and driving-away information is sent out through the warning module 6 when the recognition fails. The driving module 71 is configured to drive the door panel to move, that is, after the identity information of the worker is recognized by the identity recognition module 7, the door of the substation is driven to open, otherwise, the door does not act.
Further, the main control module 3 further includes a control unit, the control unit includes a processor and a memory capable of storing and retrieving control instructions, and the control unit is connected to the corresponding mobile terminal through the transmission network module 4. When the related staff receives the prompt short message, the video information output by the video acquisition module 1 is checked through the network transmission module, and meanwhile, the control instruction is output to the controller 33 through the network transmission module so as to control the high-definition camera 11 and the infrared camera 12 to rotate to different angles, so that the wide positions can be checked.
The implementation principle of the transformer substation enclosure monitoring system in the embodiment of the application is as follows: in the operation process of the transformer substation, the operation condition of main equipment in the transformer substation is continuously acquired through the video acquisition module 1, image information outside a transformer substation enclosure is acquired simultaneously to judge the image information, whether abnormal conditions exist in the image information is judged through the main control module 3, related responsible persons can also be connected to the main control module 3 through the mobile terminal and the transmission network module 4, the video information transmitted by the video acquisition module 1 is remotely monitored, and the working requirement that a worker stays in the transformer substation is avoided; meanwhile, the electronic fence module 2 can shield the upper part of the enclosure of the transformer substation, and safety accidents caused by the fact that personnel cross the enclosure of the transformer substation through a wall turning head are prevented.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. A transformer substation enclosure monitoring system, comprising:
the video acquisition module (1) is used for acquiring operation videos of main equipment in the transformer substation and video information outside a transformer substation enclosure;
the electronic fence module (2) is arranged at the upper part of the transformer substation enclosure wall;
the main control module (3) is used for receiving the video information output by the video acquisition module (1) and outputting pulse voltage to the electronic fence module (2);
and the transmission network module (4) is connected to the main control module (3) and is used for transmitting the video information to the mobile terminal.
2. The substation enclosure monitoring system of claim 1, wherein: the video acquisition module (1) comprises a high-definition camera (11) and an infrared camera (12), wherein the high-definition camera (11) is arranged on an enclosure of the transformer substation and is used for acquiring video information outside the enclosure; the infrared camera (12) is used for monitoring main equipment in the transformer substation.
3. A substation enclosure monitoring system according to claim 2, wherein: the electronic fence module (2) comprises a front-end detection fence (21) and a pulse transmitting unit (22), wherein the pulse transmitting unit (22) is used for continuously transmitting extra-high voltage pulse signals which are not lower than 5 kilovolts to the front-end detection fence (21).
4. A substation enclosure monitoring system according to claim 2, wherein: the main control module (3) comprises a data processing unit (31) and a discharge detection unit (32), wherein the data processing unit (31) is used for receiving video signals and analyzing whether abnormal conditions exist in videos; the discharge detection unit (32) is used for detecting the discharge time point and the discharge times of the front end detection fence (21) and transmitting the detected data to the main control module (3).
5. The substation enclosure monitoring system of claim 1, wherein: the transformer substation enclosure wall structure is characterized by further comprising an active infrared intrusion detector (5), wherein the active infrared intrusion detector (5) is arranged outside the transformer substation enclosure wall.
6. The substation enclosure monitoring system of claim 1, wherein: the alarm device is characterized by further comprising an alarm module (6), wherein the alarm module (6) comprises an audio output device (61) and a warning lamp (62).
7. The substation enclosure monitoring system of claim 1, wherein: the mobile terminal further comprises a communication module (41), wherein the communication module (41) is connected to the main control module (3) and is used for sending a prompt short message to the corresponding mobile terminal after the main control module (3) judges that the video information is abnormal and/or the front-end detection fence (21) discharges.
8. The substation enclosure monitoring system of claim 6, wherein: the alarm module (6) further comprises a delay unit (63) for enabling the alarm module (6) to continuously send out an alarm signal within a preset time period.
9. The substation enclosure monitoring system of claim 1, wherein: the transformer substation door panel opening device is characterized by further comprising an identity recognition module (7) and a driving module (71), wherein the identity recognition module (7) is used for recognizing personnel information entering the transformer substation, the personnel identity is matched with preset personnel information, and then the driving module (71) outputs a driving signal to open the door panel of the transformer substation.
10. The substation enclosure monitoring system of claim 1, wherein: the main control module (3) further comprises a controller (33) for remotely controlling the shooting angle of the high-definition camera (11) and/or the infrared camera (12).
CN202110286224.3A 2021-03-17 2021-03-17 Transformer substation enclosure monitoring system Pending CN112820054A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113744479A (en) * 2021-09-10 2021-12-03 江苏省电力试验研究院有限公司 Power distribution station room monitoring device based on time-space data comparison and early warning method thereof
CN113744477A (en) * 2021-08-18 2021-12-03 国网河北省电力有限公司检修分公司 Electronic fence alarm system based on human body induction
CN114866742A (en) * 2022-04-29 2022-08-05 华普智能科技(重庆)有限公司 Comprehensive security system of box-type substation
CN115206014A (en) * 2022-07-14 2022-10-18 浙江象网科技有限公司 Campus security device and security system thereof

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CN206460573U (en) * 2017-01-12 2017-09-01 湖南省轻工纺织设计院 Enclosure wall anti-theft alarm system
CN206711306U (en) * 2017-03-30 2017-12-05 松原电力勘测设计有限公司 A kind of substation safety burglary-resisting system
CN110189494A (en) * 2019-07-01 2019-08-30 深圳江行联加智能科技有限公司 A kind of substation's exception monitoring alarm system

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CN202102550U (en) * 2011-06-10 2012-01-04 北京国网联合电力科技有限公司 Intelligent safety prevention system for transformer station
CN102801214A (en) * 2012-08-31 2012-11-28 河南省电力公司鹤壁供电公司 Transformer substation comprehensive monitoring system based on subsystem across linkage and linkage planning
CN105303737A (en) * 2015-10-28 2016-02-03 崔子扬 Transformer station multiple safety protection system
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113744477A (en) * 2021-08-18 2021-12-03 国网河北省电力有限公司检修分公司 Electronic fence alarm system based on human body induction
CN113744479A (en) * 2021-09-10 2021-12-03 江苏省电力试验研究院有限公司 Power distribution station room monitoring device based on time-space data comparison and early warning method thereof
CN114866742A (en) * 2022-04-29 2022-08-05 华普智能科技(重庆)有限公司 Comprehensive security system of box-type substation
CN115206014A (en) * 2022-07-14 2022-10-18 浙江象网科技有限公司 Campus security device and security system thereof

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Application publication date: 20210518