17.5kv Sf6 Gas-Insulated Ring Main Unit — Compact Secondary Substation Switchgear

Basic Info

Brand	DSY
Type	17.5kV Gas-Insulated Ring Main Unit
Insulation Type	SF6 Gas-Insulated, Fully Sealed
Protection Level	IP67
Certifications	ISO9001, ISO14001, ISO45001
Standards	GB 3906, DL/T 404
Warranty	1 Year
Custom Service	OEM, ODM
Monthly Output	2400 Sets

Product Overview

17.5kV SF6 Gas-Insulated Ring Main Unit — Compact Secondary Substation Switchgear

This 17.5kV SF6 gas-insulated ring main unit (RMU) is a compact, fully sealed switchgear designed for three-phase AC 50Hz secondary distribution systems. It offers reliable performance, minimal maintenance, and high space efficiency for above-ground applications.

With IP67 protection level and low gas leakage rate ≤0.1%/year, it delivers stable operation in humid, dusty environments. The SF6 gas-insulated design ensures superior insulation and arc-quenching performance, meeting the needs of compact secondary substations.

It is widely used in urban distribution networks, commercial complexes, industrial parks, and outdoor secondary substations. Custom configurations and full technical support are available to meet your project requirements.

Detailed Photos

Key Features

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Fully Sealed SF6 Design: High insulation performance, stable arc-quenching, and extremely low gas leakage rate (≤0.1%/year).

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Compact Structure: Optimized space-saving design, perfect for compact secondary substations and urban installations.

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Environmental Adaptability: IP67 protection rating ensures reliability in humid, dusty, or harsh above-ground conditions.

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Low Maintenance: Maintenance-free design with no need for frequent gas refilling, ensuring a long service life.

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Mechanical Interlocks: Integrated safety interlocks prevent misoperation, protecting both equipment and personnel.

Technical Specifications

Parameter	Specification
Rated Voltage	17.5kV
Rated Current	630A
Rated Short-time Withstand Current (4s)	20/25kA
Insulating Medium	SF6 Gas
Protection Level	IP67
Mechanical Life	≥10,000 operations
Gas Leakage Rate	≤0.1% / year
Operating Temperature	-10℃ ~ +40℃

Application Scenarios

The 17.5kV SF6 gas-insulated ring main unit is tailored for modern power infrastructure. Its resilient design makes it ideal for:

Urban power distribution networks
Commercial buildings and office complexes
Industrial parks and manufacturing facilities
Outdoor compact secondary substations

The compact footprint and flexible configuration options allow for seamless integration into space-limited projects.

Certifications & Production

The manufacturer maintains a modern production base with advanced R&D and strict quality control protocols, holding ISO 9001, ISO 14001, and ISO 45001 certifications. Every unit undergoes rigorous testing to ensure global safety compliance.

Manufacturing Scene

Packaging & Shipping

Frequently Asked Questions

What is the gas leakage rate of this RMU?

The gas leakage rate is ≤0.1% per year, which meets and exceeds international standards for SF6 gas-insulated switchgear.

What is the typical lead time for orders?

Standard configurations typically take 4–6 weeks. For customized orders, lead times will be confirmed based on specific technical requirements.

Can the product be customized for specific projects?

Yes, we support extensive customization for rated current, protection schemes, physical dimensions, and manual or motorized operation modes.

What are the advantages of the compact structure?

The compact design significantly reduces the installation footprint, making it ideal for space-constrained urban environments and pre-fabricated secondary substations.

What warranty and documentation are provided?

We provide a standard 12-month warranty. Full documentation including technical drawings, product catalogs, and factory test reports are included.

Is this equipment suitable for outdoor use?

Yes, with an IP67 protection level and a fully sealed design, the unit is highly resistant to humidity and dust, making it suitable for outdoor secondary substations.