Digital multifunctional motor protector

The utility model discloses a digital multifunctional motor protector. After a power supply is connected, a power supply unit supplies power to various modules of a system; the system acquires effective values of three-phase current during running of a motor by an acquisition unit; an electric leaka...

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Bibliographic Details
Main Authors KONG XIMEI, TENG SHILEI
Format Patent
LanguageChinese
English
Published 25.11.2009
Subjects
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
GENERATION
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Summary:The utility model discloses a digital multifunctional motor protector. After a power supply is connected, a power supply unit supplies power to various modules of a system; the system acquires effective values of three-phase current during running of a motor by an acquisition unit; an electric leakage detection unit is used for judging whether the system has electric leakage phenomenon or not; a main control unit converts the acquired current value of the three-phase current into a PWM signal according to the proportion; the PWM signal is converted into the current of 4 to 20mA by a constant conversion circuit; a display unit comprises a keyboard and a six-bit digital display, and is connected with the main control unit by an I/O interface; a communication unit is used for achieving parameter transfer with a host computer; and an output control unit is controlled by the main control unit in real time. By acquiring the three-phase current signal operated by the motor and analyzing and processing the three-phas
Bibliography:Application Number: CN20082179592U