| 摘要 |
The present invention relates to an open-phase & antiphase detection overcurrent relay system which senses phase, antiphase, undervoltage, and overcurrent. The inventive relay system includes a differential circuit having resistors (R21 to R23 & R24 to R26), zener diodes (Z1 to Z3), NAND gates (G1 to G3), a comparator (A5), resistor (R30), resistors (R27, R28, R29), a condenser (C21), a diode (D24) & resistors (R33, R34); an antiphase and phase detecting circuit having a comparator (A6), a latch IC, a light emitting diode (LE1) & NOR gate (N2); an undervoltage sensing circuit; and an overcurrent sensing circuit).
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