PHASE LOSS PROTECTOR FOR THREE-PHASE ELECTRIC MOTOR

The utility model relates to a phase loss protector for a three-phase electric motor. Main fuses in any two phases of a three-phase electric motor are respectively connected in parallel with a double-bladed knife switch, and the other phase is connected with an auxiliary relay whose normally open co...

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Bibliographic Details
Main Author ZHOU TIANFEI
Format Patent
LanguageEnglish
Published 13.03.1991
Edition5
Subjects
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
GENERATION
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Summary:The utility model relates to a phase loss protector for a three-phase electric motor. Main fuses in any two phases of a three-phase electric motor are respectively connected in parallel with a double-bladed knife switch, and the other phase is connected with an auxiliary relay whose normally open contact is connected to an alternating current contactor. One end of a fuse wire on one side of the double-bladed knife switch is connected with a fuse wire with a greater melting point on the other side, and wire diameters at the connecting site of the two fuse wires are the same, so that the site can be fused the earliest due to the increase of electric current when a phase loss occurs, and accordingly, the electric motor can stop running. The device has the advantages of powerful adaptability to various environments and simple circuit, and can ensure that the electric motor can be stopped running or can not be started no matter whether the phase loss occurs internally or externally.
Bibliography:Application Number: CN1990217716U