Trans-Rupter II® Transformer Protector Model SE: The Perfect Fit for a Remote Industrial Substation.

A mine in the Northwest needed additional power for their tailing processing facility and a planned future expansion to their conveyor system. After consulting with the local electric utility, they decided that the best long-term solution would be to bring in an additional set of 69-kV transmission lines and construct a new distribution substation to provide the extra power.

The utility contractor specified a 69-kV S&C Trans-Rupter II Transformer Protector Model SE to protect their new 3.75/4.2-MVA distribution transformer. Model SE is ideal for remote substation applications such as this, where a ready source of control power is not present. It provides three-phase protection, fast 3-cycle circuit interruption, and a 31.5-kA interrupting rating. The self-powered overcurrent relays provide sophisticated protection at low-cost, in a compact, easy-to-install package. Internal bushing current transformers provide sensing for the overcurrent relays.

The new distribution substation significantly increased available power for the mine and will allow future expansion of their operations. They’re fully satisfied with the performance of the Trans-Rupter II in this application and plan to use it in future substation construction projects.