Wye/Wye 277/480 4 wire Transformer Bank

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Presentation transcript:

Wye/Wye 277/480 4 wire Transformer Bank © 2018 Iowa Association of Electric Cooperatives

OSHA Required Tailgate Discussion Topics Hazards Associate with the job Work Procedures Involved Special Precautions Energy Source Controls PPE Required The five topics required by OSHA to discuss in the tailgate. First letter from each topic = How Well Should Everyone Plan © 2018 Iowa Association of Electric Cooperatives

Hang the required hardware Note the side that has two cutouts is opposite the system neutral. © 2018 Iowa Association of Electric Cooperatives

© 2018 Iowa Association of Electric Cooperatives

Parallel all of the transformers internally. Ground all of the transformer cases as well as the transformer cluster. © 2018 Iowa Association of Electric Cooperatives

© 2018 Iowa Association of Electric Cooperatives

Connect the primary jumpers Connect the primary jumpers. Leaving the high side jumpers connected to the system neutral until the entire connection is completed. H1 H2 © 2018 Iowa Association of Electric Cooperatives

H1 H2 © 2018 Iowa Association of Electric Cooperatives

You may use single bushing transformers for this connection Connect the H2 bushings together and connect them to the system neutral and ground. You may use single bushing transformers for this connection © 2018 Iowa Association of Electric Cooperatives

© 2018 Iowa Association of Electric Cooperatives

Connect this to the secondary neutral Connect all X2’s together with a jumper of equal capacity to the secondary phase wires. Connect this to the secondary neutral X2 Neutral © 2018 Iowa Association of Electric Cooperatives

X2 Neutral © 2018 Iowa Association of Electric Cooperatives

Connect the secondary phase wires to the X1’s. Neutral Power Power Power © 2018 Iowa Association of Electric Cooperatives

X1 Neutral Power Power Power © 2018 Iowa Association of Electric Cooperatives

Connect the primary jumpers and close the cutouts. X1 Neutral Power Power Power © 2018 Iowa Association of Electric Cooperatives

X1 Neutral Power Power Power © 2018 Iowa Association of Electric Cooperatives

Check the secondary voltage and rotation. X1 Neutral Power Power Power © 2018 Iowa Association of Electric Cooperatives

X1 Neutral Power Power Power © 2018 Iowa Association of Electric Cooperatives