I have a distribution engineering question. I work for an electric cooperative. Our standard voltage is 7200/12470. On our system we have an open wye open delta xfmr bank served at the intersection of two single phase lines. Each line is fused. During a recent storm, one fuse blew due to lightning. A customer served by this supposed "dead" line called in to complain regarding having "part" lights which caused his refrigerator to stop working.
I am interested as to whether a backfeed could exist through the secondary of the system when one phase of the primary is opened. I am looking for reference material regarding troubleshooting of transformer problems as well.
If a backfeed can exist, what voltage would be present on the 7200 volt single phase line.
I am interested as to whether a backfeed could exist through the secondary of the system when one phase of the primary is opened. I am looking for reference material regarding troubleshooting of transformer problems as well.
If a backfeed can exist, what voltage would be present on the 7200 volt single phase line.