Air insulated switchgear
AIS - air-insulated medium-voltage high quality installation: DW-3
We engineer reliable switchgear built on safety and durability
With the DW-3 we have extended our knowledge and know-how of the DW-2 to applications with higher technical requirements. Our DW-3 is a modular concept combining all medium voltage functions. Therefore, we provide made-to-measure solutions for all your medium voltage needs.
Modular design
Metal clad
Higher Circuit
The DW-3 system is a modular concept based on the “building blocks” principle, which means that cubicles are produced in series. As a result, the modular DW-3 concept meets the highest technical standards in a rational, economically sound way. The combination of cubicles is unlimited.
Our DW-3 system is intended for higher currents (>>1250A), which makes it ideal for heavy industries. It also peaks in safety levels by being armored between the compartments, having withdrawable circuit breakers and you have an indication through the window of our cubicles. Manual operation of the cubicles requires minimal switch force. The clean and neat synoptic diagram provides a clear and safe overview of the different positions of the various parts of the cubicle.
SGC offers a wide range of applications with the DW-3 cubicles and associated air insulated switchgear solutions. Every cubicle contains all functional interlocks which allows for effortless application. That’s according to all current standards. Therefore, DW-3 allows installation in consumer work spaces. That results in minimal capacity loss.
For all your needs and demands, the DW-3 cubicles and associated air insulated switchgear provide a solution: it can replace obsolete installations and extend existing installations, and it is also perfectly suitable for entirely new constructions.
Modular air insulated switchgear: The DW-3 system
- Air Insulated Switchgear: metal clad AIS cubicles with galvanized steel sheets 2mm and armored between the compartments
- Modular system - combination is unlimited
- Higher circuit – heavy industries
- Remote control operation or manual/automatic
- 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-3 ’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.
Our DW-3 AIS product line
Discover the product that’s right for you. We, at SGC, are here to help you choose the best solution. Besides the popular DF-2 and compact DF-3 range, you have the DW-3. This is our strongest product. With it’s intention for higher current, it’s ideal for heavy industries.
Besides that you have withdrawable circuit breakers as an extra safety mechanism. Guaranteed operator safety, co-engineering and long-lasting quality are some of the reasons why SGC is a preferred partner.
Want more information? Our team is here to help. Contact us today
Technical specifications
| Rated voltage (kV) | 17,5 kV |
| Rated cubicle current (A) | 630 1250 2500 |
| Rated current of the busbar (A) | 2500 |
| Rated frequency (Hz) | 50, 60 |
| Rated power-frequency withstand voltage of the main circuit (kV, 1 min) | 38 |
| Rated power-frequency withstand voltage of secondary circuits (kV, 50 Hz, 1 min) | 2 |
| Rated lightning impulse withstand voltage (kV) | 95 |
| Rated permissible short-circuit current (kA) | 31.5 |
| Rated short-circuit duration (s) | 3 |
| Peak value of the rated short-circuit current (kA) | 80 |
| Rated internal arc withstand current ((1s), kA) | 31.5 |
| IAC arc resistance classification | AFLR 31.5 kA 1s |
| Degree of protection | IP4X |
| Maximum ambient temperature (° C) | +40 |
| Minimum ambient temperature (°C) | -5/-15 * |
| Maximum altitude above sea level (m) | 1000 ** |
| Maximum relative humidity | 95% |
** For installations at altitudes higher than 1000m, the insulation withstand level of external insulation at the service location has to be determined by multiplying the rated insulation levels by a factor Ka in accordance to IEC 62271-1.
DF-3 projects
Nomination Top Entrepreneur of East Flanders
Our CEO of Het Veer Sophie Vandoorne has been nominated for the title "Strafste Onderneemster van…
How can you protect yourself from electric arcs?
A few weeks ago, Linda Claeys - Editor ElectroVision at Nelectra, visited us.
Nomination Top Entrepreneur of East Flanders
Our CEO of Het Veer Sophie Vandoorne has been nominated for the title "Strafste Onderneemster van…
How can you protect yourself from electric arcs?
A few weeks ago, Linda Claeys - Editor ElectroVision at Nelectra, visited us.
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We excell in co-engineering made to measure solutions
Innovation and care for the environment are the driving forces behind our products and our company. A lot of our products are developed from co-engineering with clients, supplying solutions that fit their needs and specifications.