hi guys,
our elevators' programs reset whenever a voltage sag of significant magnitude occurs. our utility here explains that it normally happens when their overhead distribution lines get faulted. since the sags last for just a few msecs, it should not be a nuisance (chillers tripping off...
good day fellow engineers,
i'd like to seek your opinion or know your experience on the effect of a line-to-line fault that occurs on a wye-grounded utility feeder to an open-wye open-delta connected bank. say, the bank was connected to phases A and B of the utility feeder and the same phases...
good day everyone,
i'm working in an electric distribution utility and hope you can help me with a situation i can't yet support, technically, how it happens. almost always, our company is deluged with claims for damaged appliances whenever the secondary lead wire from one of the transformers...
thanks for the replies sirs..
here are my answers to your queries..
1. yes, it is a bank of two transformers with sizes of 100KVA and 25KVA. both are rated 19.92KV-240/120V (our system is multi-grounded wye 34.5KVY/19.92KV). the 100KVA serves the other 1-phase residential loads. by the way...
sirs,
i've encountered an open-wye open-delta connected transformer bank which gave unbalanced voltages. thinking that its the primary that's causing the problem, i energized the bank without load and got line-to-line readings of ab=232, bc=232 and ca=220volts (ca being the output across the...
