DF-2: The modular concept

Build various configurations with the DF-2 cubicles

The DF-2 system is a modular concept based on the building blocks principle, which means that the manufacturing of the cubicles takes place in series. As such the modular concept DF-2 meets the highest technical standards in a rational and economical responsible manner. The combination of cubicles is unlimited. The most complex schemes of distribution and transformation substations can be constructed.

As the switching happens in an SF6 gas medium, the dimensions of our cubicles are very restricted. The semi-compact cubicles are especially interesting when the available space is a problem or is economically a heavy factor. The cubicles contain all functional interlockings so that they will operate properly in line with all applicable standards, in a workroom next to major users. It reduces the power losses to a strict minimum. The cubicles are equipped with a pressure relief so that the user is always protected against the negative consequences of an internal arc.

Through the correct combination of basic modules (and their associated options) specific medium voltage configurations can be created (with a nominal voltage of 12, 17.5, or 24 kV) ensuring a high degree of safety.

Technical specifications

Rated voltage kV 12 17,5 24
Impulse withstand voltage 1.2 / 50 µs
– to earth and between phases kV 75 95 125
– over the insulating distance kV 85 110 145
Power frequency withstand voltage
– to earth and between phases kV 28 38 50
– over the insulating distance kV 32 45 60
Rated frequency Hz 50/60 50/60 50/60
Rated current A 800/1250* 800/1250* 630
Rated short circuit current 1s. kA 25 25 20
Rated peak value of the short circuit current kA 63 63 50
Breaking capacity RV44 (IEC 62271-103)
– active load A 800/1250 800/1250 630
– closed loop A 800/1250 800/1250 630
– cable charging load A 18 18 18
– making capacity on short circuit kA 63 63 50
– earth fault A 100 100 100
– cable and line charging current at earth fault A 30 30 30
– internal arc 1 sec. (6 criterias) kA 16 16 16
Degree of protection IP4X
Mechanical endurance c/o 1000
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
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