Patent ID: 6864688
Filing Date: 2005-03-08
Classification: B60L,G01R,Y02T

Abstract:
1. An apparatus for insulation monitoring of a DC network, the network being electrically insulated with respect to a frame potential of a device that contains the DC network; the apparatus comprising: a switch coupled in the network and selectively operable to electrically isolate a first portion of the network from a second portion of the network; a first insulation monitoring device electrically coupled to the first portion of the network on a first side of the switch to monitor an insulation resistance of the first portion of the network with respect to the frame potential; a second insulation monitoring device electrically coupled to the second portion of the network on a second side of the switch to monitor the second portion of the network with respect to the frame potential; and a non-contacting switch selectively operable in a first state to electrically couple the first insulation monitoring device to the frame potential and to electrically decouple the second insulation monitoring device from the frame potential, and selectively operable in a second state to electrically decoupled the first insulation monitoring device from the frame potential and to electrically couple the second insulation monitoring device to the frame potential.