What is harmonic superposition testing in relay protection testing and what is it mainly used for?
Harmonic superposition testing is a method used to test the operational behavior of electrical power system equipment under various harmonic conditions. This type of testing is commonly utilized to verify the differential harmonic restraint coefficient.
How to perform harmonic testing using a relay protection tester?
During harmonic superposition testing, you can set the DC components and harmonic outputs from 2nd to 20th order for channels such as UA, UB, UC, IA, IB, and IC. Theamplitude and phase of each harmonic component can be displayed and recorded based on the amplitude of the fundamental wave, or as a percentage of the fundamental wave’s amplitude. Typically, during harmonic suppression testing, the fundamental wave amplitude should be set higher than the relay’s action setting value (such as the starting value of differential protection) to ensure reliable operation of the protection even when the harmonic is small or zero. When setting harmonic data, you can choose between automatic or manual variation, which will change the amplitude and phase. Additionally, you can set digital quantities to define which channels have effective actions. During the testing process, you can define which channels’ digital quantities are effective (a checkmark “√” indicates effectiveness). The method of variation can be chosen between manual operation or automatic change (increasing and decreasing automatically).
What other parameters can be adjusted for advanced testing during harmonic superposition simulation testing with a relay protection tester?
In terms of testing parameters, you can select the varying channel, waveform, initial value of variation, upper limit of variation, variation time, and the relay’s anti-oscillation time. You can also choose the expression method of harmonics, which can be in the mode of amplitude value or as a percentage of the fundamental wave’s amplitude. Furthermore, you can set digital quantities to define which channel’s action is effective. During the test, you can define which channels’ digital quantities are effective as needed (a checkmark “√” indicates effectiveness). The method of variation can be chosen between manual operation or automation (automatically increasing and decreasing) to allow changes to the harmonic components of each phase during the testing period.
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