if the transformer bank(wye delta) has a connected loads of (1 phase and 3 phase buildings ) how i can get the reserve capacity of transformer bank??the method i made is ,i get the KW rating of all electrical facilities(lights, acu, etc) and i assume a unity power factor,(kwKVA),,,and add all the KVA loads that connected to the transformer banks.formula: Reserve Capacity Transformer bank KVA rating – (apparent power of load) is this possible even the building has a 1phase and 3phase loads????
yeah, I don't know about assuming unity power factors for lighting. That can't be right. I think florescent lighting should be a .85 pf for example.
1. kva is NOT equal to kw. 2. transformers are rated in amps, per phase 3. If it is an existing building use a clamp ammeter to measure the load. Repeat this during the day. The highest load is usually around 11am in summer hot days. 4. if it is not an existing building, check the CURRENT draw of all appliances, fluorescent lights and so, and add up. Buildings have lousy power factors from fluorescent lighting and electronic equipment (computers and such) which would make kva twice as high as kw. . .
