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CN-121994416-A - SF6 leakage environment online monitoring system and monitoring method

CN121994416ACN 121994416 ACN121994416 ACN 121994416ACN-121994416-A

Abstract

The invention relates to the technical field of safety monitoring of power equipment, and discloses an SF6 leakage environment online monitoring system and an SF6 leakage environment online monitoring method. The sensing layer realizes multi-parameter high-precision acquisition through an SF6/O2 two-in-one sensor, a temperature and humidity sensor and a human body infrared sensor based on a non-spectroscopic infrared (NDIR) double-beam difference technology, the core innovation is that a monitoring host of an edge control layer is provided with local intelligence, can perform fusion analysis on multi-source data and execute millisecond cascade dynamic control (audible and visual alarm and fan start and stop) without depending on a cloud network, the response delay problem of a traditional cloud-dependent architecture is solved, and a network layer uploads the data to a cloud platform for deep analysis and centralized management. The invention realizes the transition from passive alarm to active intelligent protection, and remarkably improves the real-time performance, reliability and intelligent level of the environmental safety of the transformer substation.

Inventors

  • SUN JIAN

Assignees

  • 上海昇源电气技术有限公司

Dates

Publication Date
20260508
Application Date
20260305

Claims (9)

  1. 1. An on-line monitoring system and a monitoring method for SF6 leakage environment are characterized by comprising the following steps: The sensing layer is arranged in the monitoring area and is used for collecting environmental state data and comprises an SF6/O2 two-in-one sensor, a temperature and humidity sensor, a human body infrared sensor and a sensor, wherein the SF6/O2 two-in-one sensor is based on a non-spectroscopic infrared technology and is used for synchronously detecting the concentration of SF6 gas and the concentration of oxygen; The monitoring host is configured to receive and process the data uploaded by the sensing layer, independently judge the processed data based on preset local alarm logic, and generate a linkage control instruction when the judging result meets the alarm condition; The executing and interacting layer is in signal connection with the edge control layer and is used for receiving the linkage control instruction and executing corresponding local actions, and the executing and interacting layer comprises an audible and visual alarm and an exhaust fan controller; The network and cloud platform layer is connected with the edge control layer through a communication network, and is used for receiving, storing and analyzing the data and event logs uploaded by the edge control layer and providing a remote human-computer interaction interface.
  2. 2. The SF6 leakage environment online monitoring system and method according to claim 1 are characterized in that the SF6/O2 two-in-one sensor comprises an infrared light source, two infrared filters with different center wavelengths, an infrared detector and a signal processing circuit, wherein one filter corresponds to the characteristic absorption wavelength of SF6 gas, the other filter is used as a reference channel, and the signal processing circuit eliminates environment common mode interference and outputs digital signals of SF6 concentration and oxygen concentration through double-beam differential calculation.
  3. 3. The on-line monitoring system and method for SF6 leakage environment according to claim 1, wherein the monitoring host comprises a microprocessor unit, a storage module and a communication interface module, wherein the storage module is pre-stored with a local alarm threshold and linkage logic, the microprocessor unit is configured to perform temperature compensation calculation on sensor data, compare the compensated data with the local alarm threshold in real time, and trigger the linkage logic to generate a control instruction for starting an audible and visual alarm and/or an exhaust fan when SF6 concentration exceeds a first threshold and/or oxygen concentration is lower than a second threshold and/or personnel entering and environment data abnormality are detected.
  4. 4. The on-line monitoring system and method for SF6 leakage environment according to claim 3, wherein the monitoring host further has a data buffering function, when communication with the network and the cloud platform layer is interrupted, processed data and event records are continuously stored in the local storage module, and after communication is recovered, the buffered data is automatically transmitted to the cloud platform.
  5. 5. The on-line monitoring system and the monitoring method for the SF6 leakage environment according to claim 1, wherein the edge control layer and the sensing layer are connected through an RS485 bus or a wireless LoRa communication mode, and the edge control layer and the network layer are connected through an Ethernet or a 4G/5G mobile communication network.
  6. 6. The on-line monitoring system and method for SF6 leakage environment according to claim 1, wherein the network and cloud platform layer comprises a cloud server and a distributed database, the cloud server provides a data interface, business logic processing and Web services, the distributed database is used for storing historical monitoring data, alarm events and system configuration information, and the cloud platform layer also provides trend analysis based on historical data, report generation and alarm information pushing services through mobile applications or WeChat ends.
  7. 7. The on-line monitoring system and method for SF6 leakage environment according to claim 1, wherein the executing and interacting layer further comprises an LED repeated display screen arranged at the entrance of the monitoring area, wherein the LED repeated display screen is in communication connection with the monitoring host and is used for displaying current SF6 concentration, oxygen concentration, temperature and humidity and system state information in real time.
  8. 8. The on-line monitoring system and method for SF6 leakage environment according to claim 1, wherein the system further comprises a remote control module integrated in a man-machine interaction interface of the cloud platform layer, and the authorized user sends a remote control instruction to the edge control layer through the interface for remote manual start and stop of an exhaust fan, silencing of an audible-visual alarm or modification of a local alarm threshold parameter.
  9. 9. An SF6 leakage environment on-line monitoring system and a monitoring method are characterized by comprising the following steps: 1) The SF6 concentration, the oxygen concentration, the temperature and humidity and the personnel activity signals of the monitoring area are synchronously acquired in real time through a plurality of types of sensors in the sensing layer; 2) The monitoring host of the edge control layer receives the acquisition signals and performs analog-to-digital conversion and signal processing; 3) The monitoring host computer analyzes and judges the processed data in real time based on a built-in algorithm and a local threshold value; 4) If the judging result triggers the alarm condition, the monitoring host immediately sends out a linkage control instruction to the executing and interaction layer to drive the sound-light alarm and/or the air exhaust action, and meanwhile, an alarm event record is generated; 5) The monitoring host uploads the collected periodic data, event records and system state information to the network and cloud platform layer through a communication network; 6) And the cloud platform layer performs persistent storage and multidimensional analysis on the uploaded data, and pushes analysis results and alarm information to related operation and maintenance personnel through multi-terminal application.

Description

SF6 leakage environment online monitoring system and monitoring method Technical Field The invention relates to the technical field of safety monitoring of power equipment, in particular to an SF6 leakage environment online monitoring system and an SF6 leakage environment online monitoring method. Background SF6 gas has been widely used in power equipment such as high voltage switchgear, GIS (gas insulated switchgear), and circuit breakers since the 50 s of the 20 th century because of its excellent insulating property and arc extinguishing ability. The insulating strength is 2.5 times of that of air, the arc extinguishing capability is 100 times of that of air, and the insulating and arc extinguishing medium is ideal for high-voltage electric equipment. However, it is also one of the most greenhouse gases and its arc decomposition products are toxic. Therefore, the strict monitoring of its leakage is a rigid requirement for grid safety and environmental protection. Conventional SF6 leakage monitoring schemes have experienced an evolution from mechanical instrumentation to on-line systems. The current mainstream systems are mostly based on a centralized architecture of 'sensor acquisition, data uploading, central server analysis and command issuing'. In practical applications, we find that such architecture has a deep and fixed defect that the security response is severely dependent on the real-time and reliability of the network channel. When a complex electromagnetic environment of a transformer substation or a network is interrupted accidentally, a chain for generating an alarm instruction from leakage to cloud can be delayed for tens of seconds or even interrupted, which constitutes a direct threat to the safety protection of personnel needing second-level response. In addition, the existing system is single in function, only the concentration of SF6 is often concerned with exceeding standard, three-dimensional risk management and control cannot be formed by correlation with oxygen content, personnel intrusion, fan state and the like, the intelligent level is insufficient, and the operation and maintenance mode is passive. Although the use of a more accurate NDIR sensor improves detection accuracy, limitations of the system architecture are not addressed. How to construct a monitoring system capable of independently, rapidly and correctly executing safety linkage even when disconnected with a cloud becomes a key technical problem for improving the intrinsic safety level of a transformer substation, so that an SF6 leakage environment online monitoring system and an SF6 leakage environment online monitoring method are provided. Disclosure of Invention (One) solving the technical problems Aiming at the defects of the prior art, the invention provides an SF6 leakage environment online monitoring system and an SF6 leakage environment online monitoring method, which have the advantages of real-time response, intelligent linkage, reliability, stability, high operation and maintenance efficiency and the like, and solve the problems of delayed response, low system intelligent degree, poor equipment environment adaptability and passive operation and maintenance mode of the traditional cloud-based architecture. (II) technical scheme In order to achieve the purposes of real-time response, intelligent linkage, reliability, stability, high operation and maintenance and the like, the invention provides the following technical scheme that the SF6 leakage environment on-line monitoring system and the monitoring method comprise the following steps: The sensing layer is arranged in the monitoring area and is used for collecting environmental state data and comprises an SF6/O2 two-in-one sensor, a temperature and humidity sensor, a human body infrared sensor and a sensor, wherein the SF6/O2 two-in-one sensor is based on a non-spectroscopic infrared technology and is used for synchronously detecting the concentration of SF6 gas and the concentration of oxygen; The monitoring host is configured to receive and process the data uploaded by the sensing layer, independently judge the processed data based on preset local alarm logic, and generate a linkage control instruction when the judging result meets the alarm condition; The executing and interacting layer is in signal connection with the edge control layer and is used for receiving the linkage control instruction and executing corresponding local actions, and the executing and interacting layer comprises an audible and visual alarm and an exhaust fan controller; The network and cloud platform layer is connected with the edge control layer through a communication network, and is used for receiving, storing and analyzing the data and event logs uploaded by the edge control layer and providing a remote human-computer interaction interface. Preferably, the SF6/O2 two-in-one sensor comprises an infrared light source, two infrared filters with different center wavelengths, an inf