Overview
1.1 Scope of Application
The GT-GIS-12 Gas-Insulated High-Voltage Switchgear is independently developed by our company and uses dry air as the insulating medium. It is mainly applied in power generation, power transmission and distribution substations, and power distribution systems for industrial and mining enterprises. It is suitable for control, protection, and monitoring under environmental conditions such as high humidity (or condensation), high altitude, and heavy pollution.
1.2 Installation Conditions
Ambient temperature: upper limit +40℃, lower limit -25℃
Altitude: ≤4000 m; for altitudes above 4000 m or other special operating conditions, consultation is required
Ambient humidity: daily average relative humidity≤95%; monthly average relative humidity≤90% Installation location: the surrounding air shall be free from explosive and corrosive gases; the installation site shall be free from frequent severe vibration or impact
Electromagnetic environment: the amplitude of electromagnetic interference induced in secondary circuits shall not exceed 1.6 kV
Note: For special operating conditions beyond normal service requirements, the user and the manufacturer shall agree through consultation.
1.3 Product Features and Structure
Strong Environmental Adaptability
The primary circuit components are enclosed in a sealed metal gas chamber with a protection rating up to IP67, effectively reducing the impact of environmental factors. It is suitable for areas with severe pollution and high humidity.
Modular Design
The product features a compact size and a tight structure, enabling convenient operation and maintenance. Its volume is only 3/5 of that of conventional air-insulated switchgear, reducing floor space requirements while providing excellent insulation performance and passing insulation tests under high-voltage conditions.
Integrated Design
The circuit breaker, disconnector, and earthing switch are integrated into a single unit, resulting in a more compact and simplified structure.
Intelligent Control Technology
Remote operation and control can be realized, meeting the requirements of unattended operation.
Product Model and Designation
Main Technical Parameters
Main Technical Parameters of GT-GIS-12 Gas-Insulated High-Voltage Switchgear
| Model |
Unit |
Value |
| Rated Voltage |
kV |
12 |
| Rated Frequency |
Hz |
50 |
| Rated Current |
A |
630~3150 |
| 1-Minute Power- Frequency Withstand Voltage |
Phase and earth |
kV |
42 |
| Across open contacts of switch and disconnector |
kV |
48 |
| Rated Lightning Impulse Withstand Voltage |
Phase and earth |
kV |
75 |
| Across open contacts of switch and disconnector |
kV |
85 |
| Auxiliary and Control Circuit Power Frequency Withstand Voltage |
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 Gas Leakage Rate |
%y |
≤0.01 |
| Rated Operating Sequence |
|
O-0.3s-CO-180s-CO |
| Insulating Gas |
|
Dry Air |
| Rated Filling Gas Pressure(Gauge Pressure,20℃) |
MPa |
0.03 |
| Alarm Pressure(Gauge Pressure,20℃) |
MPa |
0.01 |
| Minimum Insulation Pressure(Gauge Pressure,20℃) |
MPa |
0 |
| Mechanical Endurance |
Circuit Breaker |
Times |
10000 |
| Three-Position Switch |
Times |
3000 |
| Degree of Protection |
Gas Chamber |
|
IP67 |
| Enclosure |
|
IP4X |
| Rated Voltage of Auxiliary Circuits |
V |
AC/DC220 |
| Overall Dimensions(W×D×H, excluding cabinet door) |
mm |
600×1150×2400(630A~1250A) |
| 800~1000×1700×2400(1600A~3150A) |
Note: Cabinet dimensions are subject to agreement.
Overall Dimensions Drawing
JUBANG 
