High operational safety
Since the advent of increased numbers of compact substations, GRÄPER experts have carried out numerous temperature rise measurements in recognised testing bays over the past 25 years, guaranteeing customers high operational safety. For use in its own development work, and also as a part of its service offer, GRÄPER has its own in-house transportable heating measurement testing bay to measure transformer substations up to almost 2000 kVA.GRÄPER customers receive a transformer substation of excellent quality with high operational safety and availability, thanks to the right mix of fan dimensions, transformer loss performance and above all the use of lightweight concrete as a construction material.
Optimised substations
GRÄPER engineers constantly optimise fan dimensions with the in-house temperature increase testing bay, guaranteeing high quality and operational availability of all transformer substations. With regard to the heating of transformer substations, the following main aspects should be taken into account:- Correct dimensioning of the ventilation elements to remove the heat (which is mainly due to the power losses in the transformer and the low voltage components), to avoid unwanted stoppages.
- Correct electrical design, e.g. of the transformer used (VDE 0532, VDE 0536 and IEC 60354) in respect of its power losses which, together with the free ventilation cross-section, significantly influence the housing class of a transformer substation (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 installed electrical components. Use of standard, in-house GRÄPER lightweight concrete significantly reduces condensation.
