zig zag xmfr

[KLLU26]

ran into a couple zig zag xfmrs the other day and was wondering if anyone had a good source of information on them. the techs i was working with said they don't run into to many of them in the field very often.

i was TTRing them and was getting ratios of 4, 4.5, and 5.4.

from what i gathered, part of the coil is present in the adjacent coil, and their purpose is to have a zero phase shift between the delta-wye configuration?

thanks

[Kalbi_Rob]

ran into a couple zig zag xfmrs the other day and was wondering if anyone had a good source of information on them. the techs i was working with said they don't run into to many of them in the field very often.

i was TTRing them and was getting ratios of 4, 4.5, and 5.4.

from what i gathered, part of the coil is present in the adjacent coil, and their purpose is to have a zero phase shift between the delta-wye configuration?

thanks

Our local Utility keeps threatening us with using zig-zag transformers for ground protection (low impedance to ground), but the contractors keep ordering wye/delta transformers instead. As for the TTR, I've always found the back of the Vanguard TTR manual helpful in determining how to hook up my ttr for a proper turns ratio based on the ANSI description. It will tell you how to hook up the ttr and if a jumper is needed to get the proper turns ratio.

336

[Kalbi_Rob]

ran into a couple zig zag xfmrs the other day and was wondering if anyone had a good source of information on them. the techs i was working with said they don't run into to many of them in the field very often.

i was TTRing them and was getting ratios of 4, 4.5, and 5.4.

from what i gathered, part of the coil is present in the adjacent coil, and their purpose is to have a zero phase shift between the delta-wye configuration?

thanks

As for some basic informative reading on zig-zag see ECM Mag.

https://www.ecmweb.com/content/basics-zigzag-transformers