| 摘要 |
<p>PURPOSE:To improve the efficiency of cable confirmation work by inserting a diode to a lead wire at the ground side and to another lead wire in forward direction respectively. CONSTITUTION:Three lead wires 2, 3 and 4 are connected to star connection and the lead wire 4 is at the ground side. And a diode D1 is inserted to the lead wire 4 in forward direction with respect to other two lead wires 2 and 3. Also, a diode Dz is inserted to the lead wire 3 in forward direction with respect to other lead wires 2 and 4, and a resistor R is inserted in parallel to this diode D2. The resistor R is desired to be several MOMEGA to tens of MOMEGA. Because of this, a situation the same as a removed sense meter can be created at the time of measuring insulation resistance. Also, it can achieve the function as a short-circuit lead wire when judging whether a cable is of hot-line or not.</p> |
