| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a protective relay system capable of determining overload and short circuit, and also determining phase loss and disconnection in delta connection, in a three-element protective relay. Ž<P>SOLUTION: The protective relay system includes: a cross through current transformer 11 in which an R-phase and an S-phase of a three-phase power supply line cross and penetrate through a circular core having a secondary coil wound therearound in a reverse direction and at an arbitrary angle; a current transformer 12 provided on a T-phase of the three-phase power supply line; and a three E relay 20 for detecting the generation of overload, short circuit, inverse phase, phase loss and disconnection in the three-phase power supply line based on a composite current I<SB>R-S</SB>inputted from the cross through current transformer 11 and a T-phase current I<SB>T</SB>inputted from the current transformer 12. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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