Synthetic apparatus of anti-flashover and protection for low-voltage three phase asynchronous motor
A three-phase asynchronous motor technology, applied in the field of electrical automation control, low-voltage three-phase asynchronous motor control and protection, can solve problems such as abnormal parking of low-voltage three-phase asynchronous motors, and achieve accurate action time, good repeatability, and good tuning high precision effect
Inactive Publication Date: 2009-11-04
江苏冠顺电机有限公司 +1
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Problems solved by technology
[0006] Technical problem: This invention aims at the problem of abnormal shutdown of low-voltage three-phase asynchronous motors on the production line caused by swaying electricity in industrial production enterprises, and provides a low-voltage three-phase asynchronous motor anti-swaying and protection integrated device, which can realize low-voltage line grid fluctuations Restart the low-voltage three-phase asynchronous motor when it is powered on again after stopping
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[0015] The device of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0016] A production line is driven by a 380V three-phase asynchronous motor, the power frequency is 50Hz, and the main motor works in star connection. In the electric control system, the air switch, the AC contactor and the device of the present invention are used to control the restarting of electric shock and protect the motor.
[0017] When the three-phase asynchronous motor is started, the air switch is turned to the closing position, and the start button QA is pressed. At this time, since the normally closed contact 34 of the relay ZJ1 is in the default normally closed state, the AC contactor KM coil KM-3 is obtained from the control circuit. Power and close the main contact of the AC contactor KM, and the three-phase asynchronous motor starts normally. During normal operation, the 32-bit high-performance single-chip microco...
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The low-voltage three-phase asynchronous motor anti-shaking and protection comprehensive device can realize the restart of the low-voltage three-phase asynchronous motor when it stops due to the fluctuation of the low-voltage line grid, so as to solve the problem of abnormal shutdown of the production line caused by the shaking of electricity in industrial production enterprises. The present invention consists of the following parts: 1. processor, 2. clock chip, 3. battery, 4. voltage comparator circuit, 5. contactor monitoring circuit, 6. relay control circuit, 7. secondary control circuit, 8. Switching power supply, 9, terminal block. The invention can restart the motor when power is turned on after stopping due to fluctuations in the power grid, and can also distinguish two different types of events: power grid fluctuations and long-term undervoltage faults, and can determine whether the motor is in a working state before the fluctuations, and has the function of setting It has the characteristics of high precision, good repeatability, and accurate action time, and does not need an external high-power backup power supply for the device.
Description
technical field [0001] The invention is applied in the field of low-voltage three-phase asynchronous motor control and protection, and can realize the restart of the low-voltage three-phase asynchronous motor when it is stopped due to the fluctuation of the low-voltage line grid, thereby solving the problem of abnormal shutdown of the production line caused by the shaking of electricity in industrial production enterprises , belonging to the field of electrical automation control. Background technique [0002] "Shaking electricity" is a phenomenon in which the voltage fluctuates greatly and the power supply disappears instantaneously caused by the short circuit of the line or electrical equipment in the factory area, but it is restored in a short time through the function of automatic reclosing and backup power self-input device. If the equipment and system have poor ability to resist "shock electricity", it will bring undue loss to production. In general chemical and petro...
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IPC IPC(8): H02H3/06H02H3/24H02H3/247H02H7/08
Inventor 钟锐刁龙徐宇柘杨晓健黄盛平陆生礼时龙兴
Owner 江苏冠顺电机有限公司