| 摘要 |
<p>PURPOSE:To realize a testing circuit which can verify a leading current cut-off performance by an actual working frequency, by connecting in series an auxiliary circuit-breaker between a sample switch and a test power source, and connecting an inductance and a capacitance in parallel to a lead capacitance between the circuit-breaker and the switch. CONSTITUTION:An auxiliary circuit-breaker 4 is connected in series between a sample switch 1 and a test power source 3, and an inductance 5 and a capacitance 6 are connected in parallel to a load capacitance 2 between the circuit- breaker 4 and the switch 1. In this state, when the power source 3 is detached by the circuit-breaker 4 as soon as the switch 1 cuts off a current at a current zero point, a difference of vibration voltages of a residual voltage (el) of a load side and a voltage (es) of the power source side, namely, the inductance 5 and the capacitance 6 which have been provided between the switch 1 and the circuit-breaker 4 is applied to the switch 1. A leading current cut-off test by a frequency which is used by the switch 1 actually can be executed by adjusting a value of said inductance 5 and capacitance 6, and varying optionally a frequency of the power source side voltage.</p> |
