Method for detecting phase loss or phase dislocation of three-phase power

• Main Author: ZHOU JINBANG
• Format: Patent
• Language: Chinese; English
• Published: 16.01.2013
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses a method for detecting phase loss or phase dislocation of three-phase power. The method comprises the following steps of: (1) setting a time interval of 0.5 to 5 m/s of a timer, and supposing sampling ports to be any one of input ports A, B and C; (2) reading states of the ports A, B and C at each time interval, wherein ABC corresponds to binary codes 000-111; (3) making an ideal sequence CBA of the binary code of the correct three-phase power be 101-001-011-010-110-100; (4) if the sequence of the ports A, B and C is detected to be correct, adding one to a correct counter, removing a wrong counter, and if the correct counter is greater than a set value, indicating that the phase sequence is correct; and (5) if the correct phase sequence is not detected within set time of 200 ms, indicating that the phase sequence is wrong or lost. Compared with the prior art, the method for detecting phase loss or phase dislocation of the three-phase power has the advantage that phase loss or phase dis