| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable it to detect a accident occurrence section accurately without causing a blind area and an overlapped area in the case of dividing a power transmission line into a plurality of sections in order to make a charging current of the power transmission line small. <P>SOLUTION: There are provided: a plurality of photoelectric current sensors S1-S5 which are arranged at different positions along a power transmission line 100, and which detect a current which flows in the power transmission line 100; a digital type current differential relay 104 which, based on the current which two adjacent photoelectric current sensors S1-S5 detect, determines whether an accident has arisen or not in a section sandwiched by the two current sensors S1-S5; and output relays 108 which output information on the section where the digital type current differential relay 104 has determined that an accident has arisen. Photoelectric current sensors S2-S4 other than photoelectric current sensors S1 and S5 of both ends are made to serve a double purpose in order to form sections of both sides of photoelectric current sensors S2-S4, and thereby, a plurality of sections sandwiched by adjacent two photoelectric current sensors S1-S5 are formed contiguously. <P>COPYRIGHT: (C)2012,JPO&INPIT |
