Patent ID: 6108180
Filing Date: 2000-08-22
Classification: H02H

Abstract:
A device for isolating a multi-grounded neutral line in an electric power distribution network from a power-user site connected to a ground subject to an expected maximum ground potential rise having a predetermined zone of influence, comprising the following combination of components:a service transformer having a primary winding connected to the power distribution network and to said networks's multi-grounded neutral line;a user transformer having a secondary winding connected to the power-user site; andan insulated electrical connection between a secondary winding of the service transformer and a primary winding of the user transformer;wherein the service and the user transformers are separated by a distance at least as large as the zone of influence of the expected maximum ground potential rise affecting the ground connected to the power-user site, and wherein the user transformer has a basic-insulation-level rating capable of withstanding said ground potential rise.