| 摘要 |
<P>PROBLEM TO BE SOLVED: To use an inexpensive constitution and implement a protection during a phase interruption in a three-phase four-wire AC power supply. <P>SOLUTION: In the three-phase four-wire AC power supply, a control means 2 is connected to a neutral point power supply line 9n and a R-phase power supply line 9r, a current detecting means 3 is connected to a S-phase power supply line 9s, and an excitation coil of a second three-phase power supply opening/closing means 11 is connected to a T-phase power supply line 9t and the neutral point power supply line 9n through a first three-phase power supply opening/closing means 10. An opening/closing section in the second three-phase power supply opening/closing means is opened and protected even if any three-phase four-wire power supply lines have the phase interruption. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
