Anybody can tell me if I set to block the under voltage protection on a main 5 KV BUS, when one of the relay PT fuses would blows (The 27 Relay has the feature to supervise the PT voltage), with the excuse that probability of two events: under voltage phenomena and PT Relay Disruption happening...
Hi guys thank you very mach for your responds and time. I would try to be more specific.
Initially my costumer is complaining that at 208/110 V level, the voltage drops time to time for quite a period of time to about 95 V, 13.5% less than 110 V Ref. Further more he’s suspecting that hydro...
I’m having a case where from my power monitoring on the main 4000 Amp, 600 V bus fed from a 4MVA, 44KV – 600 V Transformer I see a lot of harmonic generation from a 300 KVA compressor, and different electric welding machines of the plant. The average voltage during one week monitoring is just...
Hi Dpc, and David, thank you very mach for your response. Now I believe that in my case where the voltage levels are 13.8 KV and 4.16 KV with transformers power at 5 MVA levels, DRY types the transformer dimension would be the ONLY ADVANTAGE for Y – Y transformers selection.
