Test And Analysis Of The Characteristics Of The Harmonic Amplified And Electric Energy Loss For Parallel Capacitor Set

Along with the harmonics loads increased, the harmonics pollution of the power system is increasingly serious. It is a familiar reactive-load compensation compensate way that install paralleling condenser on lOkV bus. Harmonics brought the disadvantageous influence on paralleling condenser. On the one hand, paralleling condenser may cause the harmonics electric current enlarges, cause its over-load, shorten the life span, even damage. More serious is, under the certain term, that paralleling condenser shall arouse resonance in with common function hi system parameter, appearing to dangerous over-current or over-voltage, endangering the equipments and system. The harmonics and low power factor also cause aggrandizement of calculate error, more affect electric quantity balance.This thesis theory analyzed harmonics enlarging effect, gaved harmonics analysis equivalent electric circuit of paralleling condenser, analyzed the function of reactor and the choose of reactance rate, theory calculated the voltage and current of paralleling condenser and series reactance. Harmonics amplified of paralleling condenser relate to ratio of condenser reactance branch and system equivalent branch. After added in series reactance, it can decrease harmonics frequency and reduce width of severe amplified area width. Analyzed harmonics state of Niuzai power station. Result indicate that the chief amplify is 5th and 7th harmonics. Every harmonics have asymmetry.This thesis theory analyzed and experiment researched measure error of induction watt-hour meter base on harmonics. Along with the increase of frequency, the meter measure error add, and the error of induction watt-hour meter relate to harmonics times and harmonics power. Test indicate that three-phase and three-line induction watt-hour meter did not measure symmetric zero order harmonics.Studied measure error of the electric meter under the low power factor, put forward decreasing measure error via change standard connect of induction watt-hour meter. The method is simple and high accuracy.This thesis discuss measure error of electronic watthour meter, theory analyzed and experiment researched measure error of electronic watthour meter base on harmonics.Test indicate that the testing electronic watthour meter did not measure 5th upward harmonics,and its electric energy is close to fundamental energy.Analyzed the active wastage composition of paralleling condenser, and theory account the active dissipation .Base on analyzed active wastage of paralleling condenser, this text analyzed 10kV Electric quantity balance of NiuZai and BaiMiao power stantion.The active dissipation include condenser wastage and reactor wastage.Use the real data, I calculated active wastage and active electric quantity. Compare the real copy electric quantity with the calculated electric quantity, and analyze the reason of difference.