Looking for a rule of thumb to design UPS protection network?
Uninterruptible power supplies is essential nowadays in both commercial and industrial buildings. However, short circuit protection is not that simple matter, at least I think, when using UPS.
As everyone knows, surge protection devices or surge protective devices (SPD) protect electrical equipment against overvoltages caused by lightning. That said, it is not always easy to distinguish between the various technologies or know which to choose.
MV switch disconnector
I wish to present here the benefits of utilization and operation of MV/LV parallel transformers in electrical distribution. Having such experience, i will be interested to get feedbacks from other engineers.
2 MV/LV parallel transformers distribution network
It’s Good to have in mind practical aspects: case of a low voltage switchboard To achieve the effective installation of the surge protection, the surge arrester’s connections to the grid should be as short as possible. Any cable crossed by a lightning impulse current has a significant voltage to be added to the Surge Protection Device (SPD) residual voltage.
nice picture from http://www.lafoudre.com/
Reducing power losses by optimizing equipment locations
Do you realize that power losses in a electrical installation could represent up to 7 % of the electrical consumption ?
LV cables and transformers are the most contributors to these operating losses, around 95 % as shown here below
Lightning & Surge protection: Advice to ensure a guaranteed lightning protection for a low voltage electrical installation
BIM concept (Building Information Modelling) is also promoted out of the US through building SMART International (formerly International alliance for Interoperability, IAI) which recommends a data standard for BIM: IFC (Industry Foundation Classes). I heard about projects requiring BIM design in Northern Europe…
Redondancy of supply is often a must ; protection coordination is not easy to master : case of parallel MV/LV transformers.
This case is typical for hospital and even office building where service continuity constraint is high. (more…)
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