Patent ID: 8749226

Claim:
An instrument transformer for measuring properties of electricity flowing in an elongated conductor, the instrument transformer comprising: (a.) a cover section comprising: a first core segment of a current transformer having at least one end surface; a first encasement composed of a polymer resin, the first encasement encapsulating the first core segment except for the at least one end surface; and a first fastening apparatus; (b.) a base section comprising: a second core segment of the current transformer having at least one end surface; a low voltage winding disposed around the second core segment of said current transformer; a voltage transformer comprising a coil assembly mounted to a core, said coil assembly comprising a high voltage winding and a low voltage winding, said voltage transformer low voltage winding connected to a terminal for outputting electrical property measurements of said elongated conductor; a second encasement composed of a polymer resin, the second encasement encapsulating the current transformer low voltage winding, the voltage transformer including the coil assembly and the second core segment except for the at least one end surface; and a second fastening apparatus; and wherein the first and second fastening apparatuses are adapted to engage each other to releasably secure the cover section to the base section and to align the first and second core segments such that when the cover section and the base section are secured together, the at least one end surface of the first core segment adjoins the at least one end surface of the second core segment, thereby forming a current transformer having a core formed from the first and second core segments; wherein said elongated conductor is located between said first core segment and said second core segment.