The present invention relates to a method for measuring phase angles of electrical system. The method combines the method of equivalent circuit and the method of obtaining the phase angle of voltage of two ends of lines using the phase angle between voltage and current of two ends of lines to calculate the phase angle of voltage of two ends of each line, thereby to obtain the phase angle between voltages of any two main leads. On the basis of measuring the phase angle between evey line, the phase angles between every line are added so as to obtain the phase angle between power station and the center of loads. The advantages of the invention are that GPS and high speed communication network are not depended to, that the phase angle obtained can be verified, that current stably controlling apparatus (system) can be utilized to perform this method to save cost and that the principle of the method is simple and reliable. |