| 摘要 |
PURPOSE:To unify the currents of both side buses by a method wherein an auxiliary switch, provided between a first and second switches provided on both side buses of single-phase 3-line type wiring, is opened and/or closed in conjunction with the first and second switches in accordance with the currents of both side buses. CONSTITUTION:First and second breakers 6, 8 are connected to both side buses of single-phase 3-line type wiring while the first and second breakers are connected to first and second switches 38, 40 through first and second current detectors 34, 36. The detecting value of the current detectors 34, 36 are inputted into a CPU 48. When the average value of the detecting values of current is within the range of predetermined values, the auxiliary switch is kept as it is, however, when the current I2 of the second current detector, for example, is 10A and the current I1 of the first current detector is increased to 50A quickly, the first switch 38 is put ON for 60% of a predetermined time while the auxiliary switch 42 is put ON for 40% of remaining time. According to this method, the currents I1, I2 are equalized to 30A whereby the operation of main circuit breakers 6, 8 may be avoided. |
