GRM6-24kV Ring Main Unit SF6 Gas Insulated Switchgear

Overview 

The GRM6-24kV Ring Main Unit (RMU) is a gas-insulated medium voltage switchgear widely used in power distribution networks.   This product integrates all medium voltage functional units, enabling the connection, power supply, and protection of ring or radial network transformers.   The GRM6 series features a compact design, making it suitable for various complex network configurations, especially in applications involving renewable energy.

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Operating Conditions

• Altitude: ≤4000m (when the equipment is running at an altitude of 1,000 meters or more, please especially indicate it for adjustment of charge pressure when manufacturing).

• Ambient temperature: Max. temperature: +40℃; Min. temperature: -25℃; mean temperature in 24h does not exceed 35℃.

• Ambient humidity: the mean relative humidity in 24h does not exceed 95%; the mean monthly relative humidity does not exceed 90%.

• Installation environment: There is no explosive or corrosive gas in the ambient air, and there is no severe vibration or shock applied in the installation site.

• Seismic capacity: 8 magnitude scales.

• Special conditions: The special operating conditions different from normal operating conditions must be agreed by the manufacturer and the end user. For particularly harsh operating environments, please contact the manufacturer and supplier.
  

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Product Features

• Compact Design

  Modular design with a compact structure, occupying minimal space, suitable for installations with limited space.

  Flexible combination of functional units to meet the diverse needs of users.

• High Reliability

  Utilizes SF6 gas insulation technology, offering excellent electrical insulation and arc extinguishing capabilities, ensuring long-term stable operation.

  Key components are sourced from internationally renowned brands, guaranteeing quality and low failure rates.

• Operational Safety

  Equipped with comprehensive mechanical and electrical interlocks to prevent misoperation, ensuring operator safety.

  Clear indication of open/closed positions, facilitating operation and maintenance.

• Intelligent Monitoring

  Compatible with intelligent monitoring systems, enabling remote monitoring and control, enhancing the intelligence level of power grid operations.

  Supports data collection and analysis, assisting users in condition monitoring and fault prediction.

• Ease of Maintenance

  Designed with ease of maintenance in mind, with components that are easy to disassemble and replace, reducing maintenance costs and time.

  Provides detailed maintenance manuals and technical support to ensure users can quickly resolve issues.

• Eco-Friendly and Energy Efficient

  Uses environmentally friendly materials, complying with international environmental standards, reducing environmental impact.

  Optimized design to reduce power loss and improve energy utilization efficiency.

• Wide Applicability

  Suitable for various harsh environments, including high humidity and high salinity conditions.

  Widely used in distribution networks, industrial power systems, infrastructure construction, and other fields.
  

Technical Data

NO.	Item			Unit	Load switch unit	Combined apparatus unit	Circuit breaker unit
1	Rated voltage			kV	24	24	24
2	Rated  frequency			Hz	50	50	50
3	Rated current			A	630	80 (depending on the current of fuse)	630
4	Rated insulati on level	1 minute power frequency withstand volage	Phase-to-phase, phase-to-earth	kV	65	65	65
			Open contacts		79	79	79
			Open contacts circuit		2	2	2
		Lighting impulse withstand voltage	Phase-to-phase, phase-to-earth		125	125	125
			Open contacts		145	145	145
5	Rated short-time withstand current			kA/s	25/4	-	25/4
6	Rated peak withstand current			kA	63	-	63
7	Rated short-circuit making current			kA	63	Limited by high-voltage fuse	63
8	Rated short-circuit breaking current			kA	-	Limited by high-voltage fuse	25
9	Rated transfer current			A	-	1200	-
10	Rated active load breaking current			A	630	-	-
11	Rated closed-ring breaking current			A	630	-	630
12	Mechanical          life	Load switch / circuit breaker		Times	5,000	5,000	10,000
		Disconnect switch / earthing switch			3,000	3,000	3,000
13	Loop resistance			μΩ	≤150	-	≤150
14	Rated charge pressure (gauge pressure at 20℃)			MPa	0.04	0.04	0.04
15	Annual relative leakage rate of gas			Yearly	≤0.01%	≤0.01%	≤0.01%
16	Protection grade	Cabinet body			IP4X	IP4X	IP4X
		Gas box			IP67	IP67	IP67

Outline and Installation Dimensions

Infrastructure diagram

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Technical Data

NO.	Item			Unit	Load switch unit	Combined apparatus unit	Circuit breaker unit
1	Rated voltage			kV	24	24	24
2	Rated  frequency			Hz	50	50	50
3	Rated current			A	630	80 (depending on the current of fuse)	630
4	Rated insulati on level	1 minute power frequency withstand volage	Phase-to-phase, phase-to-earth	kV	65	65	65
			Open contacts		79	79	79
			Open contacts circuit		2	2	2
		Lighting impulse withstand voltage	Phase-to-phase, phase-to-earth		125	125	125
			Open contacts		145	145	145
5	Rated short-time withstand current			kA/s	25/4	-	25/4
6	Rated peak withstand current			kA	63	-	63
7	Rated short-circuit making current			kA	63	Limited by high-voltage fuse	63
8	Rated short-circuit breaking current			kA	-	Limited by high-voltage fuse	25
9	Rated transfer current			A	-	1200	-
10	Rated active load breaking current			A	630	-	-
11	Rated closed-ring breaking current			A	630	-	630
12	Mechanical          life	Load switch / circuit breaker		Times	5,000	5,000	10,000
		Disconnect switch / earthing switch			3,000	3,000	3,000
13	Loop resistance			μΩ	≤150	-	≤150
14	Rated charge pressure (gauge pressure at 20℃)			MPa	0.04	0.04	0.04
15	Annual relative leakage rate of gas			Yearly	≤0.01%	≤0.01%	≤0.01%
16	Protection grade	Cabinet body			IP4X	IP4X	IP4X
		Gas box			IP67	IP67	IP67