High operational safety
With the increased deployment of compact substations over the past quarter century, GRÄPER experts have carried out numerous temperature rise measurements in recognised test facilities, to ensure high operational safety for their customers. To aid its own development work, and as a part of its service offer, GRÄPER also has an in-house transportable temperature rise measuring test bay to measure transformer substations up to almost 2000 kVA.Customers at GRÄPER receive an excellent quality transformer substation with high operational safety and availability, thanks to the correct combination of ventilation ratings, transformer loss performance and above all the use of lightweight concrete as building material.
Optimised substations
GRÄPER engineers continue to optimise ventilation system design with the in-house temperature rise test bay, guaranteeing the high quality and service availability of all transformer substations. When considering temperature rise in transformer substations, the following main aspects should be considered:- Correct rating of the ventilation system components to remove the heat, which chiefly depends on the power losses of the transformer and the low voltage components, to avoid unwanted outages.
- Correct electrical project planning, e.g. of the transformer to be used in the substation (VDE 0532, VDE 0536 and IEC 60354) in terms of its power losses, which, together with the free ventilation cross-section, are the main factors that determine the housing class (VDE 0670 Part 611 Appendix D).
- Avoidance of dew-point (occurrence of condensation) within a substation in unfavourable climatic conditions, so that corrosion cannot occur in the electrical components. The use of standard, GRÄPER proprietary lightweight concrete significantly reduces condensation.