Monitoring significance

With the continuous development of the power system, SF6 electrical equipment is becoming more and more widely used, especially GIS composite appliances, which are widely used due to their advantages of greatly reducing the footprint and spatial volume of electrical equipment, easy installation, safe and reliable operation, and convenient maintenance.

Pure SF6 gas is colorless, odorless, non-toxic, and non flammable, with a specific gravity five times that of air. When the distribution equipment room equipped with SF6 equipment, such as GIS, leaks, SF6 gas accumulates to a certain concentration in the lower space. If workers enter the room, serious personal safety accidents such as cerebral hypoxia and even rapid suffocation may occur. In addition, under the influence of arc, partial discharge, high temperature and other factors, SF6 gas will produce highly toxic decomposition products such as SF4, S2F2, SOF2, and some decomposition products will produce corrosive electrolytes when they come into contact with water. These not only pose a serious threat to personal safety, but also endanger the normal operation of electrical equipment. The "Electricity Safety Work Regulations" (for power plants and substations) specifically stipulate that the distribution equipment room equipped with SF6 equipment must ensure that the SF6 concentration is less than 1000ppm. In addition to installing strong ventilation devices, monitoring devices such as oxygen meters and SF6 gas concentration detection alarms that can sound an alarm must also be installed.

System Introduction

The system conducts real-time online monitoring of SF6 gas and oxygen, and alarms when SF6 concentration exceeds the standard or oxygen deficiency occurs. It automatically links the fan to work, which can effectively avoid personnel health and safety accidents caused by high SF6 concentration and decreased proportion of oxygen concentration in indoor local environments.

Mainly used in indoor scenarios such as GIS rooms and SF6 gas filling cabinets filled with SF6 gas.

Features:

SF6 gas, oxygen concentration, temperature, and humidity detection function in the environment

Real time display function of telemetry and remote signaling for all monitoring points in the environment

SF6 gas concentration exceeding standard and oxygen deficiency alarm function, forced exhaust function and automatic exhaust function

Automatic fan start function upon alarm  timed automatic exhaust function

Manually force all fans to turn on or off

Historical data query, display, and storage functions

Remote telemetry historical curve trend query and display function

Enter GIS or distribution room to automatically report the current environmental status function

Multi monitoring point configuration function in different regions

Can provide communication protocols and interface with substation backend databases

Multi point networking function, reserved for integration with backend monitoring and fire protection systems

Sound and light, voice alarm function, and remote alarm function

Supports standard Modbus RTU/TCP/104/61850 upload protocol

Technical Specifications

working environment

Working voltage: AC/DC 220V ± 10%, 50Hz

Power consumption:<10W at rated voltage

Monitoring parameters

SF6 gas concentration measurement range: 0-3000ppm

SF6 concentration over limit alarm point: 1000ppm (national standard value), accuracy<5% FS

Oxygen content detection range: 0-25%

Hypoxia alarm point: 18% (national standard value), accuracy<1% FS

Temperature detection range: -30 to+99 ℃ (accuracy ± 0.5 ℃)

Humidity detection range: 10-99% RH: accuracy ± 0.5% RH

Other parameters

Remote communication method: 485/Ethernet

On site host dimensions (mm): L330 × W250 × H65

Detection unit size (mm): L162 × W150 × H38

Monitoring historical data storage capacity: 5 million records

Touch screen size: 7 inches

Installation method of host and detection unit: wall mounted