wtdoor67
11-24-2010, 10:56 AM
PSO did have one feature I thought good. Each type of transformer had a code number. I only remember one code #. For example if you had a bad pot you just called in for a 711 of a certain KVA. This was a little handier than saying you wanted a certain KVA, 7620, double bushing, 120/240 I guess.
I recall a 411 was a 7620 single bushing with 120/240 secondary. They always ordered OH pots with protected bushings and used 5KV covered #4 for primary leads. No squirrel guards etc. required. They had a few good practices.
Oh yeah, forgot to add they ordered all pots with a transformer mounted arrester. They've done this for several years. Only thing you have to be cut in on is when you build a Wye/Delta bank, "floated etc.", you have to take the arresters off the pots and arm mount them. Possibility of closing in and getting a temporary backfeed that will blow up the arresters. Seen it done wrongly though and nothing happened.
I recall a 411 was a 7620 single bushing with 120/240 secondary. They always ordered OH pots with protected bushings and used 5KV covered #4 for primary leads. No squirrel guards etc. required. They had a few good practices.
Oh yeah, forgot to add they ordered all pots with a transformer mounted arrester. They've done this for several years. Only thing you have to be cut in on is when you build a Wye/Delta bank, "floated etc.", you have to take the arresters off the pots and arm mount them. Possibility of closing in and getting a temporary backfeed that will blow up the arresters. Seen it done wrongly though and nothing happened.