The direction of current flowing through the circuit breaker apparatus and method for determining

The present invention proposes a method and apparatus for determining the direction of current flowing through a circuit breaker, wherein the current breaker having a predetermined reference direction. The method comprising: obtaining a current flowing through the circuit breaker sample values ​​(i (t)) and the differential value of the current (i '(t)); obtaining the sampled voltage value (u (t)) of the circuit breaker; according to the present time (tn) until a timing circuit breaker and where the equivalent relationship between voltage and current in the circuit to obtain equivalent resistance (R) and the equivalent circuit of the equivalent inductance (L) (tn-1) lower; If the equivalent resistance (R) and equivalent inductance (L) are greater than zero, it is judged that the current flowing through the circuit breaker current direction coincides with the reference direction, if the equivalent resistance (R) and the equivalent inductance (L) is less than zero, it is determined that the flows in the opposite direction to the direction of current of the reference current circuit breaker.