| 摘要 |
Provided is an apparatus and method for preventing reverse power flow of an over current relay. When a neutral line current is greater than a phase current, it is determined that a reverse power flow occurs, and thus a protection relay is prevented from malfunctioning. The apparatus for preventing reverse power flow of an over current relay includes: a detecting unit which detects a phase current and a neutral line current; a reverse power flow determining unit which is electrically connected to the detecting unit and compares the phase current and the neutral line current which are detected by the detecting unit to determine whether or not a reverse power flow occurs; a setting unit which is electrically connected to the reverse power flow determining unit and sets an operation time and the number of operation times of a protection relay; and an operation unit which is electrically connected to the setting unit and operates the protection relay in a manner set by the setting unit. |
