Fig. 1. Structure of a thermal trip device.
Fig. 2. Structure of a magnetic trip device.
Fig. 3. Configuration of a conventional digital relay.
Fig. 4. Configuration of the proposed relay.
Fig. 5. Voltage monitoring.
Fig. 6. Circuit of the control circuit.
Fig. 7. Prototype of the proposed relay.
Fig. 8. Flow chart for the operation.
Fig. 9. A motor control sequence and application of the proposed relay.
Fig. 10. Typical signal in case of a reverse phase.
Fig. 11. Typical signal in case of an open phase.
Table 1. LED indication by fault types.
참고문헌
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