| 摘要 |
A method for faulted phase determination in combined electric networks with an insulated neutral includes measurement of instantaneous magnitudes of neutral potential, calculating a row of intermediate values of argument thereof and comparison of said row and reference phase intervals. Moreover, upon each one sixth part of a period the control points corresponding to a zero transient moment of line voltages are fixed. A time interval between two adjacent control points is measured and frequency improved value is calculated, which is used for obtaining the following intermediate results of the row, if sequential order of phases is changed from direct to reverse, the limits of phase intervals are shifted by one-sixth of the period to the direction of leading thereof, the reference phase intervals of retarding and leading phases are interchanged. |
