| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a phase discrimination apparatus for a distribution line which is easy to handle, whose structure is simple and low-cost and which can be applied to the discrimination of not only the phase of the distribution line such as an underground cable or the like being constructed but also the phase of a light wiring part in a medium-rise building, a high-rise building and an apartment being newly built. <P>SOLUTION: In the phase discrimination apparatus, a signal is transmitted so as to be injected into parts across phases of the three-phase distribution line 3 from a transmitter 1 installed at one end of the distribution line 3, and each phase correspondence relationship between its transmission side and its reception side is detected on the basis of a received signal by a receiver 2 installed on the other end of the distribution line 3 so as to discriminate its phase. In the transmitter 1, an intermittent signal A and an intermittent signal B whose numbers of times of generations within one cycle are different, and a signal C which has added the signals, are transmitted so as to be injected into the parts between the phases. In the receiver 2, each correspondence relationship between the transmission side and the reception side is detected on the basis of the numbers of times of the generations of the intermittent signals from the parts between the phases, and the phase is discriminated. <P>COPYRIGHT: (C)2003,JPO |
