A system, method and computer program product for linking multidimensional data sources in a relational database using database joins are disclosed. A line image position information encoding section encodes the separation information and outputs coded line image position information. The upper portion includes a transparent lens disposed about an axis thereof. Such startup sequence operates to prevent damaging in-rush currents in a system employing the dynamically biased apparatus in a feedback control loop. After the high dielectric strength liquid has been added, a voltage is applied and the partial voltage discharge of the power cable is measured.