Grounding banks for balancing feeder voltages

DISTRIBUTION engineers, seeking means to provide a better balance of neutral voltage on 3-phase feeders, have suggested the use of grounding banks at one or more points along the feeder. The term ´grounding bank´ is used here to mean a Y-delta transformer bank, the Y side tapped from the feeder with the Y neutral connected to the system neutral, whether the latter be an ungrounded conductor, a multigrounded conductor, or simply the earth itself (Figure 1). Such a bank may be installed solely for the performance of grounding duty. The dual role of grounding duty and load service should be considered, particularly for existing load-serving banks.