High voltage line fault zero crossing point fast prediction method

• Main Authors: HAO ZHIGUO, ZHANG HANHUA, XU JINGDONG, AI SHAOGUI, BAI CUNXI, HU XIUMING, HUANG YONGNING
• Format: Patent
• Language: Chinese; English
• Published: 25.12.2018
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses a high voltage line fault zero crossing point fast prediction method. The high voltage line fault zero crossing point fast prediction method comprises the following steps thatS1, a model of a fault current signal i (t) is established; S2, a discrete current signal i (n) is obtained; S3, the discrete current signal i (n) is subjected to discretization to obtain a sampling signal i' (n); S4, a discrete voltage signal u (n) is constructed; S6, pseudo-inverse of a sampling matrix I is multiplied by a sampling matrix U to obtain a square matrix I+U; S7, the square matrix I+U is subjected to order-reduction to obtain a characteristic root; S8, the phase difference |theta| between a predicted power frequency component and a reference voltage signal in a sampled current signal is obtained; S9, the reference voltage signal is delayed by delta T to obtain a second phase difference |theta'| between a power frequency component and the reference voltage signal in the sampled current signal; S10, th