SF6 gas concentration host

1.1 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.

1.2 SF6 gas concentration hostProduct Introduction

The SF6 gas concentration online monitoring and alarm system (hereinafter referred to as the system) is an intelligent online monitoring system designed and developed to provide personal health and safety protection for workers in distribution equipment rooms equipped with SF6 equipment, based on the current emphasis on safety production in the power system.

1.3 SF6 gas concentration hostTechnical Features

·SF6 gas concentration detection function in the environment

·Oxygen concentration detection function in the environment

·Temperature and humidity detection function in the environment

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

·Real time display of alarm information for all monitoring points in the environment

·Fixed value setting function

·SF6 gas concentration exceeding the standard and oxygen deficiency alarm function

·Oxygen deficiency or excessive SF6 concentration, forced 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 the GIS room and automatically report the current environmental status function

·Multi monitoring point configuration function in different regions

·Multi point networking function, can provide communication protocol and substation backend database docking (reserved)

·Provide a universal communication interface and reserve the ability to interface with backend monitoring and fire protection systems (reserved)

·Alarm information storage and recording function

·Sound and light, voice alarm function

·Remote alarm function

·Human infrared detection and sensing function

·Data remote transmission function

1.4 Technical Parameters

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

·Power consumption:<10W at rated voltage

·Accuracy level: 2.5

·SF6 gas concentration measurement range: 0-3000ppm

·SF6 concentration over limit alarm point: 1000ppm (national standard value), accuracy<2% 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 ± 3% RH

·Fan output power contact: 6A

·Remote communication method: RS485 Modbus RTU

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

·SF6 and oxygen detection unit size (mm): L162 × W150 × H38

·Temperature and humidity 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

·Working environment temperature: -25 ℃~70 ℃

·Working environment humidity: ≤ 95%

·According to the provisions and methods of GB/T 17626, test the electromagnetic compatibility performance indicators of this device:

Electrostatic discharge, level 4

Radio frequency electromagnetic field radiation immunity, level 3

Electrical fast transient burst immunity, level 4

Surge (impact) immunity, level 4

Conducted disturbance immunity induced by radio frequency field, level 3

Power frequency magnetic field immunity, level 5

Pulse magnetic field immunity, level 5

Damping oscillation magnetic field immunity, level 5

Voltage sag and short-term interruption immunity, 60% UT, lasting for 10 cycles;

·According to the provisions and methods of GB/T 11287 and GB/T 14573, test the mechanical performance indicators of this device:

Vibration response, level 1

Vibration durability, level 1

Shock response, Level 1

Impact durability, Level 1

Collision, Level 1