Hello,
I am curious if anyone can take a gander at what this electrical problem could be.
They are experiencing sporadic events a few times an hour in which new lithium battery cabinets there were installed are discharging or charging for an extremely brief period. See video below. Samsung says this is not normal for the cabinets. The old batteries did not have any type of monitoring to catch this event (if it was occuring). These each have their own computer to record the data.
All 9 UPS are fed from the same Medium Voltage "B" building feeder. Each B2, B3, and B4 are separate substations which each have 13.2kv to 480v transformers.
My first thought - Theoretically, Could a large inductive load (either in the building or even neighboring buildings) on the medium voltage feeders cause a momentary dip or spike in the 13.2kv line, pass through the separate transformers, and cause each of the UPS rectifiers to simultaneously spike or dip the DC bus voltage for a moment - thus causing the quick discharge/charge event? if the DC bus voltage goes down from 535v, the cabinets would show discharging, and if it spikes above, cabinets show charging. This quickly levels out once the spike goes away and the DC bus voltage is stabilized. The UPS are not new.
Video Link -
I am curious if anyone can take a gander at what this electrical problem could be.
They are experiencing sporadic events a few times an hour in which new lithium battery cabinets there were installed are discharging or charging for an extremely brief period. See video below. Samsung says this is not normal for the cabinets. The old batteries did not have any type of monitoring to catch this event (if it was occuring). These each have their own computer to record the data.
All 9 UPS are fed from the same Medium Voltage "B" building feeder. Each B2, B3, and B4 are separate substations which each have 13.2kv to 480v transformers.
My first thought - Theoretically, Could a large inductive load (either in the building or even neighboring buildings) on the medium voltage feeders cause a momentary dip or spike in the 13.2kv line, pass through the separate transformers, and cause each of the UPS rectifiers to simultaneously spike or dip the DC bus voltage for a moment - thus causing the quick discharge/charge event? if the DC bus voltage goes down from 535v, the cabinets would show discharging, and if it spikes above, cabinets show charging. This quickly levels out once the spike goes away and the DC bus voltage is stabilized. The UPS are not new.
Video Link -