This document describes test procedures for determining the knee point voltage and verifying the current transformation ratio of a current transformer (CT). The knee point test involves gradually increasing the voltage source connected to the primary winding while the other windings are open, and recording the voltage and current readings. The primary current injection test involves injecting current into the primary winding with the secondary winding shorted, and recording the actual and calculated current ratios. Both tests are intended to check specifications listed on the CT nameplate.