Apparatus for detecting the health-unhealthy side of the power supply system in private power generation facilities

摘要

PROBLEM TO BE SOLVED: To prevent the occurrence of accidents by accurately opening a linkage breaker of a non-utility power generating facility during unsound state at the power supply side, by judging whether the power supply side is sound or not from the variation of a relative difference in admittance. SOLUTION: When a current detected by a current detecting section 27 is a predetermined value, and the admittance based on a current and a voltage detected by a current detecting section 27 and a voltage detecting section 28 is a predetermined value, a switch 23 is turned on and off periodically or irregularly or continuously for a certain time period before or after a certain time, and before and after a certain phase angle based on a zero cross point of voltage or current at the branch line 20, and the load capacity of a detecting impedance load section 25 connected in parallel to a non-utility load is changed more than once periodically. At this time, if no change in admittance based on a change in current and voltage created by the power supply side 10 and the non-utility power facility side 12 is detected at the current detecting section 27 and voltage detecting section 28, then the power supply side 10 is judged to have no trouble and is sound.