US Patent 7488194 Downhole data and/or power transmission system

An apparatus has a downhole tubular body having a bore with a central axis. An electrical conductor assembly is disposed within the bore of the tubular component, the assembly having a first end, a second end, a first conductor, and a second conductor electrically isolated from the first conductor. At least one end of the assembly has a polished mating surface which has an electrically conductive portion surrounded by a dielectric material. The electrically conductive portion is in electrical communication with the first conductor. The first and second ends of the electrical conductor assembly are substantially aligned to the central axis of the bore by stabilizing elements within the bore.