Ring Main Unit SF6 Gas Insulated Switchgear

Overview 

The RM6 SF6 Gas-Insulated Ring Main Unit stands as a pivotal medium-voltage electrical distribution device, crafted to fulfill the stringent requirements for safety, reliability, and adaptability in contemporary power systems. Utilizing SF6 gas for insulation and arc extinguishment, this unit is apt for 12kV/24kV power systems. It finds extensive application across urban distribution networks, industrial complexes, and commercial hubs, providing a solution that is both efficient and dependable for electrical distribution needs.

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Environmental Conditions

• Altitude: <2000m;

• Ambient temperature: -40℃~+40℃, the average temperature within 24 hours does not exceed 35℃;

• Ambient humidity: daily average <95%, monthly average <90%;

• Installation environment: no violent vibration and shock and no fire, explosion danger;

• Seismic capacity: 8 degrees, ground horizontal acceleration <0.4g, ground vertical acceleration <0.2g.

Note: If the operating environment exceeds the above range, please contact our company.

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Product Features

• Superior Insulation and Arc-Quenching: By harnessing the exceptional insulation and arc-quenching properties of SF6 gas, the RM6 unit ensures prevention against electrical faults, thereby guaranteeing a stable power system operation.

• Versatile Modular Design: This unit is designed with modularity at its core, enabling the customization of electrical components such as circuit breakers, load switches, and earth switches to meet specific requirements, offering bespoke electrical distribution solutions.

• Space-Efficient Structure: Its design prioritizes compactness, facilitating straightforward installation and utility even in environments where space is at a premium, thus optimizing installation space.

• Ease of Operation and Maintenance: Designed for front operation, the unit eliminates the need for internal access, significantly boosting operational safety and convenience. The maintenance process is streamlined, contributing to lower operational and maintenance expenses.

• Environmental Stewardship: Emphasizing a closed-loop system for SF6 gas use and an eco-friendly design approach, the unit minimizes its environmental footprint. It is also engineered for ease of recycling and disposal, aligning with environmental compliance.

• Comprehensive Protection: Offering an array of protection functions, including overload and short-circuit protection, the RM6 unit ensures the grid and connected equipment remain safe and stable across various scenarios.

Technical Data

		C module	F module	V module		CB module
		Load switch	Combination electric appliance	vacuum switch	Isolation/grounding switch	Direct-air  circuit breaker	Isolation/ grounding switch
Rated Voltage	KV	12	12	12	12	12	12
Rated Frequency	HZ	50	50	50	50	50	50
Power Frequency Withstand Voltage (phase/fracture)	KV	42/48	42/48	42/48	42/48	42/48	42/48
Lightning shock withstand voltage	KV	75/85	75/85	75/85	75/85	75/85	75/85
Rated current	A	630	Note 1	630		1250/630
Breaking ability
Rated closed loop breaking current	A	630
Rated cable charging break current	A	10
Rated short circuit closing current (peak)	A	50	80
Rated peak tolerable current	kA	50
Rated short-time tolerable current	kA/ 3s	20
Rated short circuit breaking current	kA		31.5	20		25
Rated transfer current	A		1700
Use the maximum current of the fuse	A		125
Loop resistance	-n	≤300	≤600
Mechanical life	Times	5000	3000	5000	2000	5000	2000
Note 1:  Depends on the current rating of the fuse.

Main circuit scheme diagram

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