WAUSAU PAPER TRANSFORMER REPLACEMENT
Krech Ojard & Associates was contacted by Wausau Paper to replace the transformer at their Mosinee Mill. The KOA Electrical Group was hired to review the present engineering on the existing T21 5000kVA Transformer. Krech Ojard prepared new relaying trip logic, engineering drawings and overall construction management for the installation of a new 5000 kVA transformer and primary breaker.
The work was done at Wausau Paper during a five day outage where all new control wiring was run to a central control room panel for remote open-close of the primary breaker along with status of breaker and transformer trip circuitry. The existing sudden pressure trip relaying circuitry was not adequately protecting the mill and was re-engineered on the new transformer and also on two other existing transformers.
