Air insulated switchgear

High-quality AIS – air insulated switchgear: DF-2(+)

We engineer reliable switchgear built on safety and durability

It’s our most popular product: the “DF-2”, is a metal-clad and high-quality AIS switchgear solution.  A modular concept which combines all medium voltage functions. It allows us to provide “made-to-measure” solutions for all your medium voltage needs.

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Modular design

2-position load break switch

Arc-killer option

The DF-2 system is a modular concept based on the “building blocks” principle, which means that cubicles are produced in series. As a result, the modular DF-2 concept meets the highest technical standards in a rational, economically sound way.

The combination of cubicles is unlimited. Very complex diagrams of distribution and transformer switchgear can be compiled through this extensive spectrum of possibilities. Our AIS solutions are always extendable, compartmentalized and can handle up to 24 kV.

The DF-2 cubicles and associated air insulated switchgear solutions offer a wide range of applications and can be used worldwide in many industries. DF-2 cubicles can be utilized with distribution and dispersion switchgear, electrical sub- stations and medium voltage engines, wind generators, cogeneration, and much more.

The DF-2-concept provides a solution for all your needs and demands: it can replace obsolete installations and extend existing installations, and it is also perfectly suitable for entirely new constructions.

Moreover, it’s built to withstand extreme conditions, maximize the life of your switchboard and guarantee operator safety.

Modular air insulated switchgear: The DF-2 system

  • Air Insulated Switchgear: metal enclosed AIS cubicles with galvanized steel sheets 2mm and between the compartments 4 mm
  • Modular system – expandable - combination is unlimited
  • High operator safety
  • Switching in SF6 for switch or vacuum circuit breaker
  • Stand alone cubicles – high continuity
  • Built to withstand extreme weather conditions
  • Can be equipped with a wide range of optional features

Equipped with a robust two-position load break switch RV-44 (open or closed), that is sealed for life. Can withstand a pressure of 800 A and optional 1250 A (double busbar system). DF-2 ’s modular design allows you to create rational, economical & custom-made combinations of medium voltage cubicles (with a rated voltage 12,17 or 24 kV).  The position of the load break switch is clearly indicated in the single line diagram. The position can be controlled at all times, not only by the synoptic but also through the two inspection windows integrated in the front door of the cubicles. This kind of load break switch has large contacts and can withstand the voltage with pressure.

Internal arc resistance

The DF-2 is designed to resist internal arcs, protecting both the operator and the installation. Through a strategic pressure release system, the internal arc is restricted to the compartment where it originated, and it does not propagate towards the operator or to other compartments. A short-circuit or another malfunction can create an internal arc. An internal arc in a classic MV cubicle, could severely damage the installation and possibly injure the operator and electrocute him or her. With built-in ARC-killers SGC aims to protect its users and operators.

The anti-arc kit of DF-2 cubicles is specifically designed to minimize the consequences of an internal arc. By default, all provided cubicles are fitted on the rear side with overpressure valves pointing downward. Moreover, all SGC – SwitchGear Company cubicles are internal arc resistant. The DF-2 cubicles were tested at KEMA IAC (AFL) FOR 20 kA/1s as well at a rated voltage of 17,5 kV/24kV according to IEC 62271-200, appendix A and met the 5 criteria.

Discover Arc-killer

Our DF-2 AIS product line

Discover the product that’s right for you. SGC helps you choose the best solution. Our DF-2 range is our most popular product range, and it’s popular for a reason. Our DF-2 range is especially designed and built to withstand extreme weather conditions. It’s applicable in all parts of the world, whether there are extreme cold or extreme hot temperatures. It’s built to last: all components are robust and of the highest quality.

Guaranteed operator safety, co-engineering and long-lasting quality are some of the reasons why SGC is a preferred partner. Want the top of the range with built-in ARC-killer? Then go for the the DF-2+. The DF-2+ includes the arc-killer SV-25, a system for detecting and extinguishing an internal arc.

A DF-2+ is a metal-enclosed cubicle of the DF-2 type combined with a shaft at the rear of the cubicle. The shaft absorbs the gasses (in case of an internal arc) that escape through the overpressure valves. As a result, the expansion of hot gasses in a room can be reduced to an absolute minimum. The arc-killer extinguishes the arc by directing it to a metal earthed short circuit. The arc is extinguished in less than 50 ms.

Want more information? Our team is here to help.

Contact us today

Want more information? Our team is here to help.

Contact us today

Technical specifications

Rated voltagekV1217.524
Impulse withstand voltage 1.2 / 50 μs:
- To earth and between phaseskV7595125
- Over the insulated distancekV85110145
Power frequency withstand voltage:
- To earth and between phaseskV283850
- Over the insulated distancekV324560
Rated frequencyHz50/6050/6050/60
Rated currentA800/1250 (*)800/1250 (*)630/800
Rated short-time current 1skA252520
Rated peak value of the currentkA636350
Breaking capacity RV44 (class E3):
- Mainly active loadA800/1250 (*)800/1250 (*)630/800
- Closed loopA800800630/800
- Load cable chargingA181818
- Making current636350
- Earth faultA100100100
- Earth fault cable chargingA303030
Internal arc 1skA16/20 (**)16/20 (**)16/20 (**)
Degree of protectionIP4XIP4XIP4X
Mechanical durability c/o100010001000
Standards: IEC 62271-100, IEC 62271-1, 62271-102, -103, -105, 62271-200 and IEC 61243-5
Certificats: KEMA/IPH

(*) According to IEC 62271-103, class E1 / (**) Option Arc-killer

Download our complete DF-2 catalogue

Our DF-2 cubicles can be used in a wide range of configurations

DF-A

Incoming cubicle or cable field with load break switch and interlocked earthing switch


DF-P

Transformer protection cubicle with load break switch/fuse combination


DF-C-750

Metering cubicle


DF-K

Cable cubicle and/or rail shaft

Discover more and other configurations

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DF-2 projects

Cabling via 3D engineering

Turnkey cabling with 3D design software

Optimizing production processes with our cable machine, an automation solution for wire assembly.

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Delivery of DF-2 station for Moundou in Chad.

For a substation of SNE in Chad, contractor Deba opted for SGC’s DF-2 program.

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New exclusive distributor of Switchgear Company in Vietnam

We are proud to confirm that Asia Technology and Energy System Co. Ltd is the official dealer of…

Read More

Cabling via 3D engineering

Turnkey cabling with 3D design software

Optimizing production processes with our cable machine, an automation solution for wire assembly.

Read More

Delivery of DF-2 station for Moundou in Chad.

For a substation of SNE in Chad, contractor Deba opted for SGC’s DF-2 program.

Read More

New exclusive distributor of Switchgear Company in Vietnam

We are proud to confirm that Asia Technology and Energy System Co. Ltd is the official dealer of…

Read More

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Other SGC solutions

AIS

Air insulated switchgear

  • Always extendible
  • Minimal amount of SF6 (LBS)
  • Switchgear is compartmentalized
  • Withdrawable circuit breaker
  • 12 kV – 17,5 kV –  24 kV

GIS

Gas insulated switchgear

  • Ring main unit
  • Gas insulated
  • Compact monobloc
  • Lateral extension is optional
  • 12 kV – 17,5 kV – 24 kV – 36 kV 

HYBRID

Hybrid switchgear

  • Always extendible
  • Air insulation + minimal amount of SF6
  • Switchgear is compartmentalized
  • Withdrawable circuit breaker
  • 12 kV – 17,5 kV – 24 kV 

We excell in co-engineering 
made to measure solutions

Innovation and environmental care are the driving forces behind our products and company. A lot of our products are developed from co-engineering with clients, supplying solutions that fit their needs and specifications.

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