SF6 gas is currently the more ideal insulation and arc extinguishing medium due to its inherent characteristics. However, its micro-water content, gas density and so on will have a direct impact on the operation of the equipment, the safety of personnel, the reliability of the power grid. Therefore, the monitoring of the water content and gas density of SF6 electrical equipment has always been an important part of the monitoring of equipment in the relevant industries.

Micro water density on-line monitoring systemIt is a product used in 110kV-750kV voltage level circuit breaker or GIS to monitor gas pressure, temperature, relative humidity, micro water density, dew point, micro water volume fraction. The product provides RS485 interface, which is convenient for data interaction with the backend system; the device is designed with anti-interference mode, which stabilizes the gas data under complex environment. The hardware adopts high-performance industrial-grade microprocessor, with fast operation speed and short response time. Widely used in substation GIS internal gas condition monitoring.

The micro water density monitoring system is an intelligent on-line monitoring system designed and developed in accordance with the current situation of the power system emphasizing on safety production and providing personal health and safety protection for the staff working in the room of the power distribution unit where SF6 equipment is installed.

The system collects the density of micro-water inside the gas, analyzes the composition of micro-water inside the gas in real time, and uploads the data to the centralized collection and monitoring machine through wired RS485 communication and then transmits it to the backend system through RS485 or Ethernet for visual inspection.

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Micro water density on-line monitoring system

The micro-water density monitoring system consists of micro-water density sensing unit, centralized collection and monitoring machine (or monitoring host) and background monitoring system. One of the micro-water density sensing unit for the site of a regional point data sensing transmission, monitoring host through the RS485 wired acquisition of the monitoring unit data, monitoring point of the gas pressure, temperature, relative humidity, density, dew point temperature, micro-water volume fraction and other parameters, can be preset alarm signals, manual, alarm automatically, the human body close to the automatic, cyclical start-up fan, etc., through the RS485 and the background of the data communication. Data communication with the background through RS485.

Microwater density monitoring unit

Microwater density monitoring unit (the above picture is for reference only and is based on the real thing)

Monitoring mainframe panel diagram (the above picture is for reference only, subject to the physical)

Rear view of the monitoring mainframe (the above picture is for reference only, subject to the actual object)

 

Microwater density online monitoring system is a key project set up by our company according to the requirements of national smart grid development. This series of products adopts telemetry and remote sensing technology and background computer technology in one, with compact appearance, which can realize high-precision measurement, computer background processing, massive historical data storage and other functions, and is applicable to various voltage levels of SF6 circuit breakers, GIS, AIS and other equipment SF6 gas microwater It is suitable for online measurement of SF6 gas, density and temperature of SF6 circuit breakers, GIS, AIS and other equipments of various voltage levels, realizing advanced dynamic monitoring and control such as emission-free, environmental protection, safety, real-time and remote, in order to meet the needs of automation of electric power distribution network and state maintenance of equipments, and reserving the interface for intelligent construction of electric power grids.

System ProductsKey Features

Micro water density sensing unit main function

  • Emission-free, environmentally friendly, economical, safe and reliable
  • On-line monitoring of pressure, temperature, relative humidity, density, dew point, micro water and other parameters in SF6 circuit breakers and other appliances
  • Realization of pressure-excitation and temperature compensation of micro-water and temperature compensation of density, so that micro-water and density data are real and reliable.
  • Microwater monitoring unit with multi-technology and self-calibrating sensors
  • The monitoring mainframe can be put into operation and withdrawn without affecting the state of the micro-water density monitoring unit, without affecting the normal operation of other equipment.
  • Density monitoring unit utilizes internal circulation technology to dramatically improve sampling accuracy.
  • Fully enclosed design, waterproof and dustproof, anti-high-frequency interference, applicable to indoor and outdoor
  • A variety of valve connectors, easy to install and remove, saving maintenance costs

Main functions of the monitoring mainframe

  • Acquisition of pressure, temperature, humidity, density, dew point, micro water and other detection functions at each monitoring point
  • The terminal analyzes and records the telemetry, telecommunication and alarm information of all monitoring points in real time
  • Multi-point network function, can provide communication protocol and substation background database docking (reserved)
  • Data remote transmission function, support RTU485, RJ45 Ethernet interface
  • Support modbus communication protocol

Micro water density sensing unit technical specifications

Microwater density monitoring unit
Temperature monitoring range -40～+80℃
Temperature monitoring accuracy ±0.5°C
Pressure monitoring range 0 to 1.00 MPa (abs.)
Pressure monitoring accuracy ±1%FS
Scope of dew-point monitoring -50℃～+20℃
Dew point monitoring accuracy ±2°C
Scope of microwater monitoring 10 to 20,000 ppmv
Microwater monitoring accuracy ±4%FS
Sealing performance Air leakage rate≤1×10-9Pa.m3/s
communication method RS485 (default 9600bps)
power supply DC12V
power wastage 300mW

Monitoring mainframe specifications

Monitoring mainframe

operating voltage

AC/DC 220V±10%,50Hz

Power Consumption

 <10W at rated voltage

Fan output power contact

 Passive Normally Open, 250VAC/5A AC; 30V/5A DC
Remote communication method RS485/RJ45 Ethernet
Surveillance All-in-One Dimension(mm) L483×W300×H44
Mounting method of main unit and detection unit Convergence cabinet or group screen installation
Operating Temperature -25℃～70℃
Key data from collection points Pressure: Resolution of 0.1Kpa,
Temperature: Resolution 0.1℃
Relative Humidity: Resolution 0.1%RH
Density: Resolution 0.1 MPa (P20)
Dew point: resolution 0.1℃
Microwater volume fraction: resolution 0.1PPmV

Maximum Supported Acquisition Points

 Supporting a maximum of 64 points, the

Dual acquisition ports, acquisition 1 port acquires 1~32 points, acquisition 2 port acquires 33~64 points

Field installation of micro water density sensing unit

Field installation of micro water density sensing unit

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