There is a need to power a battery charger, which requires 3 ph 480V 20A circuit. There is no 480V available at this location, however there's an electrical panel 120/240V where 3 ph 240V is available. Loads in that panel are connected by 100A breaker (installed inside the panel). There was a suggestion from managment to use power from that panel and a 45kVA transformer which we already have. This is wye (H) to delta (X) configuration.
I have quite many objections against this idea, like for example:
I have quite many objections against this idea, like for example:
- high inrush current may be tripping breakers when the transformer is being switched on
- the transformer seems to be grossly oversized for that application, but considering that charger may represent highly non-linear load, the transformer will be overheating anyway from harmonics.
- convince management to hire external electrical company to do the installation
- try to do it on my own, ignoring the fact that I have much more background in electronics and automation than electrical installations. But here, in the USA, energy and enthusiasm sometimes counts more than knowledge and experience, as I have noticed.