Gas Insulated Ring Main Unit
Zhejiang Tianrun Electric Co., Ltd. is one of the leading manufacturers and suppliers of gas insulated ring main unit in China. We are committed to providing high quality customized products with competitive price. We warmly welcome you to buy bulk advanced gas insulated ring main unit from our factory. Also, quotation is available.
Product Overview
The environmentally friendly air-insulated AC metal-enclosed switchgear is independently developed by our company following the global green development trend of the power industry, based on years of distribution network construction experience. Unlike gas insulated switchgear (GIS) that relies on SF6 as the insulating medium, it adopts an air-insulated design with domestic and international technologies, providing customers with high-quality, environmentally friendly power distribution solutions. With reasonable design, reliable power supply, compact structure, easy installation, flexible operation, small footprint and high cost-effectiveness, it is suitable for power receiving and distribution in substations, switching stations, industrial and mining enterprises, airports, railways, tunnels and high-rise buildings.
Product Features
Green and Eco-friendly
Dry-air insulation without SF6 greenhouse gas, aligned with the industry trend toward SF6-free equipment.
01
Compact Size
Space-saving cabinet design with a much smaller footprint than conventional switchgear, suitable for space-constrained distribution sites.
02
Reliable Protection
Fully sealed gas tank with good dust and water resistance, stable insulation performance and essentially maintenance-free operation.
03
Durable in Service
Long-life vacuum switch and spring-loaded mechanism, light operation and easy installation.
04
High Cost-effectiveness
Wide application range with lower civil and installation costs, especially suitable for terminal distribution.
05
Product Parameters
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Main Technical Parameters |
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Project |
Unit |
Circuit Breaker Unit Load Switch Unit |
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Rated Voltage |
kV |
12 |
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Rated Frequency |
Hz |
50 |
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Rated Current |
A |
630 |
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1 min Power Frequency Withstand Voltage |
Ground, Phase-to-Phase |
kV |
42 |
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Between the Breaks |
48 |
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Lightning Impulse Withstand Voltage |
Ground, Phase-to-Phase |
kV |
75 |
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Between the Breaks |
85 |
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Rated Short-Time Withstand Current and Duration |
Main Circuit |
kA |
20/4s |
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Grounding Circuit |
17.4/2S |
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Rated Peak Withstand Current |
Main Circuit |
kA |
50 |
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Grounding Circuit |
43.5 |
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Rated Short-Circuit Making Current (Peak Value) |
kA |
50 |
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Rated Short-Circuit Breaking Current |
kA |
20 |
/ |
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Rated Short-Circuit Breaking Current Making Times |
Times |
30 |
/ |
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Rated Operation Sequence |
0-0.3S-CO-180S-CO |
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Rated Cable / Line Charging Breaking Test |
Class C2 |
/ |
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Asymmetrical Phase-to-ground Fault Breaking Current |
kA |
17.4 |
/ |
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Rated Active Load Breaking Current |
A |
630 |
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Rated Closed-Loop Breaking Current |
A |
630 |
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Rated Cable Charging Breaking Test |
A |
10 |
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5% Rated Active Load Breaking Current |
A |
31.5 |
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Number of Grounding Switch Closing |
5 |
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Loop Resistance |
uΩ |
≤140 |
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Rated Gas Pressure (Gauge Pressure at 20℃) |
Mpa |
0.02 |
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Mechanical Life |
Vacuum Circuit |
Times |
10000 |
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Isolation Switch |
3000 |
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Grounding Switch |
3000 |
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Protection Level |
Casing Gas Tank |
IP4X |
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IP67 |
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Operating Power Supply |
V |
AC220 / DC220 / DC110 / DC48 / DC24 |
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Rated Annual Leakage Rate |
% |
≤0.1 |
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Cabinet Size (Single Circuit) |
mm |
420×822×1420 |
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Withstand Internal Arc Fault |
kA/s |
20/0.5 |
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Moisture Content in Dry Air |
ppm |
≤150 |
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Vacuum Switch Mechanical Characteristics Parameters |
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Project |
Unit |
Vacuum Circuit Breaker |
Load Switch Unit |
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Contact Opening Distance |
mm |
8±1 |
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Contact Overtravel |
3.5±1 |
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Average Opening Speed(6mm after opening) |
1.2±0.2 |
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Average Closing Speed(6mm before closing) |
0.8±0.2 |
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Contact Bounce Time at Closing |
≤2 |
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Three-Phase Synchronization of Closing |
≤2 |
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Three-Phase Synchronization of Opening |
ms |
≤2 |
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Closing Time |
30-70 |
≤900 |
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Opening Time |
18-50 |
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Phase-to-Phase Distance |
mm |
150±1.5 |
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Contact Bounce Amplitude at Opening |
mm |
≤1.5 |
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Contact Overtravel Amplitude at Opening |
mm |
≤2 |
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Rated Contact Pressure |
N |
1600±160 |
1100±100 |
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Isolating and Grounding Switch Main Technical Parameters and Characteristic Parameters |
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Item |
Unit |
Isolating Switch |
Grounding Switch |
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Rated Voltage |
kV |
12 |
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Rated Frequency |
Hz |
50 |
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Rated Current |
A |
630 |
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1 min Power Frequency Withstand Voltage |
Between Phases and to Ground |
kV |
42 |
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Across the Break |
48 |
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Lightning Withstand Impulse Voltage |
Between Phases and to Ground |
kV |
75 |
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Across the B |
85 |
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Rated Short-Time Withstand Current and Duration |
kV |
20/4s |
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Rated Peak Withstand Current |
kV |
50 |
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Mechanical Life |
Times |
3000 |
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Contact Pressure |
N |
160±20 |
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Manual Closing Operation Force |
N |
≤200 |
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Manual Opening Operation Force |
N |
≤200 |
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Dynamic and Static Contact Opening Distance |
mm |
≥100 |
100 |
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Phase-to-Phase Distance |
mm |
150±1.5 |
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Synchronization of Grounding Switch Closing |
ms |
/ |
≤2 |
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Normal operating conditions
- Ambient air temperature: Upper limit +40℃, lower limit -40℃
- Humidity: Average daily relative humidity not exceeding 95%; average monthly relative humidity not exceeding 90%.
- Water vapor pressure: Average daily value not exceeding 2.2 kPa; average monthly value not exceeding 1.8kPa; Altitude not exceeding 2000m,
- The surrounding air is not significantly polluted by dust, smoke, corrosive, flammable gases, vapors, or salt mist.
- The amplitude of electromagnetic interference induced in the secondary system does not exceed 1.6kV.
Application
- Urban distribution networks & switching stations: For ring power supply, cable branching and terminal distribution; can be paralleled with ring main units to form switching stations.
- Small secondary substations & box-type switching stations: Compact size, suitable for prefabricated cabins, box-type substations and space-constrained distribution sites.
- Industrial & mining enterprise distribution: For MV distribution, workshop incoming and load control in factories, mines and manufacturing parks.
- Commercial & civil buildings: For power distribution systems of high-rise buildings, commercial complexes, residential areas and office buildings.
- Infrastructure: Airports, railways, tunnels and other places with high power supply reliability requirements.
- Smart grid & load centers: Distribution rooms in smart grids, urban distribution networks and various load centers.
- Cold & high-altitude regions: Wide temperature range down to -40°C and altitude up to 2000 m, suitable for cold northern and plateau projects.
FAQ
Q: What is the difference between this eco-friendly switchgear and a traditional ring main unit (RMU)?
A: This product is a metal-enclosed fixed switchgear with dry-air insulation and a more compact structure; RMUs are mostly used for ring power supply. Selection should be based on the primary scheme and site requirements.
Q: What abnormal signals should be watched during operation?
A: It is recommended to monitor signals such as abnormal gas pressure, mechanism not charged, and protection alarm; subject to the actual secondary configuration.
Q: Can microprocessor protection or smart monitoring devices be fitted?
A: Protection and monitoring devices can be configured per project requirements; specific models and available space should be confirmed with the manufacturer.
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