This distortion can be explained by harmonic contents with Fourier series analysis. The fifth and seventh harmonics are largest in amplitude. When and the power system has these harmonic contents in side both in voltage and current, then, some problem of malfunction in electronic control parts, capacitor bank breakdown, overheating in power cables and busbars, and overheating in power transformers and motors might be occurred that make unstability on power system that might cause more waste in cost and time to maintain the system. To limit some problem may occur if having harmonic contents in power system, the requirements of IEEE 519-1992 as shown in Table 1 and 2 are defined for warning power system engineer.