The author provides a description of South Dakota Cement's high and medium-voltage distribution systems, which provide electric power to the various plant processes. The system's deficiencies with respect to the IEEE standard for cement plants, operational continuity, and personnel safety are noted. A plan to be used as a guide for future installation and upgrades of the plant's electrical system is also presented. It is noted that the proposed changes and additions to the high-voltage (69 kV) system will provide for service continuity in the event of a catastrophic failure. This flexible high-voltage system will allow for annual preventive maintenance to be scheduled during nonshutdown periods. The following benefits will be realized from the proposed upgrade to the 2400 V medium-voltage system: the oldest and least reliable electrical equipment will be replaced; the 2400 V and 480 V ungrounded delta systems will be replaced; the older low-efficiency motors will be replaced by newer high-efficiency motors.
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