Safety control method and device of system with pre-charge circuit and system with pre-charging circuit
A pre-charging circuit and safety control technology, applied in the direction of measuring current/voltage, emergency protection circuit devices, electrical components, etc., can solve the problems of high current flow, heat generation, and voltage rise in the pre-charging resistor, so as to avoid overheating of the resistor, The method is simple and the operation efficiency is high
Inactive Publication Date: 2019-02-26
ZHEJIANG CHINT ELECTRIC CO LTD
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Problems solved by technology
[0004] If the contactor or relay is not closed after charging is completed, the pre-charging resistor is still connected in series with the main circuit, and the voltage at both ends of the pre-charging resistor rises, causing a large current to flow inside the pre-charging resistor for a long time, causing it to heat up and even ignite surrounding combustibles
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[0021] The following content further illustrates the specific implementation manner of the safety control method of the system with the pre-charging circuit of the present invention. The security control method of the system with the pre-charging circuit of the present invention is not limited to the description of the following embodiments.
[0022] In the safety control method of a system with a pre-charging circuit of the present invention, after the system finishes charging, obtain the voltage U at both ends of the pre-charging circuit, compare the voltage U at both ends of the pre-charging circuit with the voltage setting value Umax at both ends of the pre-charging circuit, and set the voltage Fixed value Umax=Rmax×Imax, among them, Rmax is the contact resistance value of the contactor or relay of the pre-charging circuit, Imax is the current value flowing through the pre-charging circuit when the rated load is running, when U<m*Umax, the system is normal , when U≥m*Umax,...
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The present invention relates to the technical field of automatic control, especially to a safety control method and device of a system with a pre-charge circuit and a system with a pre-charge circuit. The safety control method comprises the steps of: after a system completes charge, obtaining voltages U of two ends of a pre-charge circuit, and comparing the voltages U of two ends of the pre-charge circuit with voltage set values Umax at the two ends of the pre-charge circuit, wherein the voltage set value Umax=Rmax*Imax, the Rmax is a contact resistance value of a contact or a relay of the pre-charge circuit, the Imax is a value of a current flowing through the pre-charge circuit when a rated load is operated, when U<m*Umax, the system is normal, and when U>=m*Umax, the over-current alarmsignals are emitted. The device employs the safety control method for control. The system comprises a device. The control method is more comprehensive in protection and faster in fault discovery, andthe device and the system are simple in structure and low in cost.
Description
technical field [0001] The invention relates to the technical field of automation control, in particular to a safety control method, equipment and system for a system with a pre-charging circuit. Background technique [0002] The pre-charging circuit of the high-power inverter is realized by connecting the pre-charging resistor in parallel with the contactor (or relay). [0003] When the pre-charging circuit is powered on, the contactor (or relay) is in the disconnected state, and the capacitor is charged and stored through the pre-charging resistor. After the charging is completed, the contactor (or relay) is turned on, and the output of the rectifier circuit passes through the contactor (or relay). ) contact system directly supplies power to the inverter. [0004] If the contactor or relay is not closed after charging is completed, the pre-charging resistor is still connected in series with the main circuit, and the voltage at both ends of the pre-charging resistor rises,...
Claims
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Login to View More IPC IPC(8): H02H7/12G01R19/165H02M1/36
CPCH02H7/1216G01R19/16576H02M1/36
Inventor 于雪峰王景凯
Owner ZHEJIANG CHINT ELECTRIC CO LTD