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GRM6-24kV Ring Main Unit SF6 Gas Insulated Switchgear

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.
Rated Voltage:
Rated Current:
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  • GRM6-24

  • Giantele

  • 24KV

  • 630A

  • Three

  • 1pcs

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.


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.


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.ItemUnitLoad switch unitCombined apparatus unitCircuit breaker unit
1Rated voltagekV242424
2Rated  frequencyHz505050
3Rated currentA63080 (depending on the current of fuse)630
4Rated insulati on level1 minute power frequency withstand volage

Phase-to-phase,

phase-to-earth

kV656565
Open contacts797979
Open contacts circuit222
Lighting impulse withstand voltage

Phase-to-phase,

phase-to-earth

125125125
Open contacts145145145
5Rated short-time withstand currentkA/s25/4-25/4
6Rated peak withstand currentkA63-63
7Rated short-circuit making currentkA63Limited by high-voltage fuse63
8Rated short-circuit breaking currentkA-Limited by high-voltage fuse25
9Rated transfer currentA-1200-
10Rated active load breaking currentA630--
11Rated closed-ring breaking currentA630-630
12Mechanical          lifeLoad switch / circuit breakerTimes5,0005,00010,000
Disconnect switch / earthing switch3,0003,0003,000
13Loop resistanceμΩ≤150-≤150
14Rated charge pressure (gauge pressure at 20℃)MPa0.040.040.04
15Annual relative leakage rate of gasYearly≤0.01%≤0.01%≤0.01%
16Protection gradeCabinet body
IP4XIP4XIP4X
Gas box
IP67IP67IP67


Outline and Installation Dimensions

图片


Infrastructure diagram

23

Technical Data

NO.ItemUnitLoad switch unitCombined apparatus unitCircuit breaker unit
1Rated voltagekV242424
2Rated  frequencyHz505050
3Rated currentA63080 (depending on the current of fuse)630
4Rated insulati on level1 minute power frequency withstand volage

Phase-to-phase,

phase-to-earth

kV656565
Open contacts797979
Open contacts circuit222
Lighting impulse withstand voltage

Phase-to-phase,

phase-to-earth

125125125
Open contacts145145145
5Rated short-time withstand currentkA/s25/4-25/4
6Rated peak withstand currentkA63-63
7Rated short-circuit making currentkA63Limited by high-voltage fuse63
8Rated short-circuit breaking currentkA-Limited by high-voltage fuse25
9Rated transfer currentA-1200-
10Rated active load breaking currentA630--
11Rated closed-ring breaking currentA630-630
12Mechanical          lifeLoad switch / circuit breakerTimes5,0005,00010,000
Disconnect switch / earthing switch3,0003,0003,000
13Loop resistanceμΩ≤150-≤150
14Rated charge pressure (gauge pressure at 20℃)MPa0.040.040.04
15Annual relative leakage rate of gasYearly≤0.01%≤0.01%≤0.01%
16Protection gradeCabinet body
IP4XIP4XIP4X
Gas box
IP67IP67IP67


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