Patent ID: 7598751

Claim:
A test device comprised of: a load bank; voltage measurement circuitry and devices; current measurement circuitry and devices; relaying and switching devices; and data acquisition, measurement and control devices comprising at least one processor and a memory operably connected with said voltage measurement circuitry and devices, current measurement circuitry and devices, and relaying and switching devices, wherein said test device is configured to (i) determine a first set of results comprised of at least a first voltage and first current and a first phase angle of an electrical node on an electrical power system and store the first set of results in the memory, (ii) operably connect the load bank to the electrical power system at the electrical node using said switching devices and determine a second set of results comprised of at least a second voltage, second current and a second phase angle of said electrical power system at said electrical node, and (iii) retrieve the first set of results from said memory and compare the first set of results to the second set of results to determine at least one of an effective Thevenin equivalent circuit or Norton equivalent circuit for the electrical power system.