Multi-grounded neutral electrical isolation between utility seco

Details Multi-grounded neutral electrical isolation between utility seco Multi-grounded neutral electrical isolation between utility seco

1999-03-03

2000-08-22

Sherry, Michael J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 43, 361118, 361119, H02H 908

Patent

active

061081809

ABSTRACT:
A multi-grounded neutral electrical isolation system for a personal-communication-system cell site consists of two standard distribution transformers separated by a distance greater than the zone of influence corresponding to the maximum expected ground potential rise at the PCS cell site. The primary winding of the first transformer is connected to the utility's low-voltage distribution system and is grounded through the network's ground. The secondary winding is connected to the primary winding of the second transformer through a high-voltage non-shielded insulated conductor and the frames of the two transformers are kept electrically isolated. The secondary winding of the second transformer energizes the PCS cell site and shares its ground connection, which is also common to the adjacent high-voltage transmission tower. All neutrals are grounded through their respective grounding systems. The second transformer is selected with a basic-insulation-level rating sufficient to withstand the maximum ground potential rise expected to occur at the cell site as a result of a fault or a lightening discharge at the high-voltage transmission tower. By separating the two transformers by a distance at least equal to the zone of influence corresponding to such a GPR, the isolation of the distribution grid from the cell site is ensured. Moreover, the BIL rating of the transformers protects the transmission grid from a sudden potential rise due to a fault in the transformer's insulation.

REFERENCES:
patent: 3932804 (1976-01-01), Allen
patent: 4573098 (1986-02-01), Williston

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