Calibration Method for Excitation Loss Protection with Admittance
Most excitation loss protections are impedance protection with two impedance networks as protection setting values,whose trajectory can be easily measured by the conventional relay protection test device.To be different,the excitation loss protection with admittance has three admittance values and three admittance angles.Due to the infinity of admittance loci in admittance plane,relay protection test device cannot directly measure the entire trajectory.The calibration method recommended by the equipment manufacturer is to manually test a few action points on the admittance loci,but not the entire admittance loci.Impedance conversion by admittance method is to convert admittance trajectory to impedance trajectory through mathematical method,and then through the measured impedance trajectory to indirectly verify the entire admittance loci.Despite the complexity of the conversion process,the experimental success on 2 units verifies that the theorized impedance trajectory is completely consistent with the measured impedance trajectory.
excitation loss protection with admittancemathematical transformationimpedance network calibration
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维普
