Assemble the circuit according to the foregoing topographic diagram. Do not forget that the current transformer may not be operated in open circuit on its secondary side! The resistive load, located in the primary circuit, is star connected and set to resistance value R6 for every phase. Connect the three-phase current transformer so that the resulting current transformation ratio is 1:1. Starting from 0 V, increase the value of the supply voltage to obtain 1 A on the primary circuit. Measure the three primary current alternately and read off the secondary currents with the neutral conductor N connected or disconnected. N connected N disconnected N connected N discounted IL1 (A) 1 1 I1 (A) …………… …………… IL2 (A) 1 1 I2 (A) …………… …………… IL3 (A) 1 1 I3 (A) …………… …………… The three measured currents must be approximately equal in both cases; slight deviations may be explained by the components tolerances. Asymmetrical can also be measured with this circuit. Change only the resistive loads of the phases L2 and L3 to the value R5. Increase the supply voltage to obtain a primary current ILI = 1 A. Measure the three secondary currents, once with and once without the neutral conductor N connected.
Assemble the circuit according to the foregoing topographic diagram. Do not forget that the current transformer may not be operated in open circuit on its secondary side! The resistive load, located in the primary circuit, is star connected and set to resistance value R6 for every phase. Connect the three-phase current transformer so that the resulting current transformation ratio is 1:1. Starting from 0 V, increase the value of the supply voltage to obtain 1 A on the primary circuit. Measure the three primary current alternately and read off the secondary currents with the neutral conductor N connected or disconnected. N connected N disconnected N connected N discounted IL1 (A) I1 (A) 1 …………… 1 …………… IL2 (A) I2 (A) 1 …………… 1 …………… IL3 (A) I3 (A) 1 …………… 1 …………… The three measured currents must be approximately equal in both cases; slight deviations may be explained by the components tolerances. Asymmetrical can also be measured with this circuit. Change only the resistive loads of the phases L2 and L3 to the value R5. Increase the supply voltage to obtain a primary current ILI = 1 A. Measure the three secondary currents, once with and once without the neutral conductor N connected.
new_power_system_operation_and_control_ee.docx