The results

Date: 2015-10-07; view: 422.

How did they do it?

Siting the new substation proved difficult . . . . The mine is located in a remote area away from other significant electric loads. Neither the mine nor the utility wanted to incur large real estate and capital expenses usually associated with constructing a substation. Equipment selection became a key issue.

The mine specified a 69-kV S&C Trans-Rupter II 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.

A V-type disconnect was installed on the dead-ending structure to pick up transformer magnetizing current. S&C Loadbuster Disconnects were installed on the low-side to provide an isolating disconnect for future transformer maintenance.

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.