capacitors;  harmonic current;  Harmonic amplification

Through the test and analysis of a 220 kV substation of Henan Power Grid, it is confirmed that the harmonic current injected into the power grid by the electric traction load on the 110 kV side exceeds the standard, and the 7th and 9th harmonic currents in the capacitor are amplified due to improper configuration of the parameters of the capacitor loop, resulting in frequent burning of the capacitor. By adjusting the parameters of the capacitor loop, the harmonic current amplification is reduced, the harmonic current in the capacitor is reduced, and the normal operation of the capacitor is guaranteed.