Development of a Condensive Capacitor for Countermeasure of Harmonics and its Application to Customers Substation

Trouble due to harmonics rapidly increases after 1990. A ratio of troubled equipment caused by the harmonics shows a series reactor and a power capacitor account for 65% and 26%, respectively. A modified JIS recommends allowance 5th harmonic current of 55% in the series reactor, and standardize to a 6% series reactor for a capacitor. However, to install the capacitor with the 6% series reactor due to harmonic current is sometimes the temperature rise in observed. The authors clarify a combination of capacitor and reactor to reduce harmonic current efficiently. A Capacitor based on the combination is applied to customer substations of 6.6kV and 33kV. This paper describes the capacitor, which is named Tough Var, and test results at the substations.