2006-04-17 21:06:51
DRAWA: new medium voltage small switchboards

Elektromontaż Poznań System Manufacturing Plant have launched DRAWA medium voltage small switchboards  for a range of industrial applications.

DRAWA is indoor switchgear engineered to receive and distribute three-phase alternate current of 24 kV rated voltage and 50 Hz frequency in industrial and dedicated power networks. DRAWA can be well fitted at contained transformer stations and local medium voltage distribution centres. Compact size make DRAWA switchgears a second to none solution for new or upgraded power facilities of limited extension room.

Characteristics of DRAWA switchgears include:
1. compartment arrangement
2. single busbar arrangement
3. steel housing
4. air jacket
5. steel partitions
6. gas insulated terminals
8. arc protection

State-of-the-art engineering combined with simple arrangements ensure easy operation, maintenance, and outstanding safety parameters. Multiple fields of different main circuit instrumentation have been provided for versatile applications and various customized configurations of multiple DRAWA switchboards.

DRAWA switchgears are combined of distributing fields equipped with instrumentation as required for the segment’s function within the dispatch arrangement. State-of-the-art terminal connectors are provided to ensure enormous reliability.
Each field is made of zinc or alu-zinc plated steel sheets for enhanced corrosion resistance. Doors, covers, and outer shields are powder painted.

Robust field structure ensures longevity and protection against inner electric arc.
Steel covers release if activated by the pressure of the gas generated during electric arc combustion.

DRAWA switchgear parameters:

Rated voltage	12 kV / 17.5 kV / 24 kV
Surge withstand voltage	75 kV / 95 kV / 125 kV
Withstand voltage 1 min 50 Hz	28 / 42* kV / 38 kV / 50 kV
Rated frequency	50 Hz
Phases	3
Rated continuous current	630, 1250 A
Rated peak withstand current	50 kA
Short-time withstand current (1 s)	20 kA
Arc resistance	20 kA / 1 s.
Busbar arrangement	single
Dimensions
Height	1700 (+200**) mm
Width	375, 500, 600, 750 mm
Depth	1000 (+220***, +80****) mm
Protection class	do IP-54

*) Requirements according to ΓOCT 14693:1990 standard
**) Low voltage
***) Switch-off drive
****) Disconnector drive