1.1 Scope of application

GT-GIS-12 inflatable high-voltage switchgear is independently developed by our company. It utilizes dry air as the insulating medium and is primarily used for power distribution in power plants, substations of power transmission and transformation systems, and distribution in industrial and mining enterprises. It is also suitable for use in high humidity (or condensation), high altitude, and polluted environments, where it performs control, protection, and monitoring functions.   

1.2 Installation conditions

Ambient temperature: Upper limit +40℃, lower limit -25℃

Altitude: 4000m and below; negotiable for altitudes above 4000m or other special usage conditions

Environmental humidity: Daily average relative humidity ≤95%?Average relative humidity ≤90%

Workplace: There are no explosive or corrosive gases in the surrounding air, and the installation site is free from frequent severe vibrations or shocks

Electromagnetic interference: The amplitude of electromagnetic interference induced in the secondary system is ≤1.6kV

Note: Special usage conditions, when exceeding normal usage conditions, shall be negotiated between the user and the manufacturer.

1.3 Product Features and Structure

■ Strong environmental adaptability

The live part is enclosed in a metal gas box with a protection level of IP67, effectively reducing the impact of the environment on it. It can be used in areas with relatively severe pollution and humidity

■ Modular design

It features a small size, compact structure, and convenient operation and maintenance. Its volume is only 3/5 of a conventional air cabinet, reducing the footprint. Additionally, it boasts excellent insulation performance and can pass insulation tests in a normal pressure environment

■ Integrated design

The integrated design that combines circuit breakers, disconnectors, and earthing switches results in a more compact and concise structure

■ Intelligent control technology

It can achieve remote operation and control, meeting the requirements of unattended operation

Main Technical Parameters Table of GT-GIS-12 Inflatable High-Voltage Switch Cabinet

ZW68-12：
Rated voltage (KV): 12
Rated frequency (Hz): 50
Rated current (A): 630~3150
1min power frequency withstand voltage, phase-to-ground and phase-to-phase (kV): 42
1min power frequency withstand voltage between switch and isolating fracture (kV): 48
Rated lightning impulse withstand voltage, phase-to-ground and phase-to-phase (kV): 75
Rated lightning impulse withstand voltage between switch and isolating fracture (kV): 85
Power frequency withstand voltage of auxiliary circuit and control circuit (kV): 2
Rated short-circuit breaking current (kA): 25/31.5/40
Rated short-circuit making current (peak value) (kA): 63/80/100
Rated short-time withstand current (kA): 25/4, 31.5/4, 40/4
Rated peak withstand current (kA): 63/80/100
Annual leakage rate (%/Y): ≤0.01
Rated operation sequence: O-0.3s-CO-180s-CO
Insulating gas: dry air
Rated inflation pressure (relative pressure, 20℃) (MPa): 0.03
Alarm pressure (relative pressure, 20℃) (MPa): 0.01
Minimum insulation level pressure (relative pressure, 20℃) (MPa): 0
Mechanical lifespan: Circuit breaker (times): 10,000
Mechanical lifespan: Three-position switch (times): 3000
Protection level: Inflatable box: IP67
Protection level: Outside the cabinet: IP4X
Rated voltage of auxiliary circuit (V): AC/DC 220
Overall dimensions (width × depth × height, excluding cabinet door) (mm): 600×1150×2400 (630A~1250A), 800~1000×1700×2400 (1600A~3150A)

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