Phase failure protector of electric motor
A technology for motor and voltage protection, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of only increasing the response current, unable to play a protective role, and not getting protection, etc., to achieve convenient operation, reliable performance, and simple structure. Effect
Inactive Publication Date: 2012-11-07
STATE GRID CORP OF CHINA +1
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Problems solved by technology
However, the use of the above two open-phase protectors is limited by the operation and installation location. For example, the current type must be delayed to avoid the influence of the starting current of the motor, and only respond to the increase of the current. Within the time delay (motor starting process), the motor will not be protected if the motor is started with a heavy load and a phase failure occurs.
However, the pure voltage type cannot protect the phase failure after the protector is connected.
Method used
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[0013] Such as figure 1 , 2 , Shown in 3, the present invention comprises voltage protection part and current protection part, is characterized in that:
[0014] The three-phase AC power supply is connected to the voltage converter of the voltage protection part, and the voltage converter is connected to the rectifier. The voltage signal from the AC power supply is converted into a three-phase DC voltage through the voltage converter and the rectifier. The rectifier is connected to the voltage indicating LED The voltage indication light-emitting diode is connected with the undervoltage protection zener diode, the undervoltage protection zener diode is connected with the amplifier, and the amplifier is connected with the NAND gate; the voltage indication light-emitting diode is also connected with the overvoltage protection zener diode , the overvoltage protection Zener diode is grounded through the sampling resistor R, and a NOR gate is connected between the overvoltage prote...
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The invention relates to a phase failure protector of an electric motor, comprising a voltage protection part and a current protection part. A three-phase alternating current power supply is connected with a voltage converter, a rectifier, a voltage indication light-emitting diode, an undervoltage protection voltage-stabilizing diode, an amplifier and an NAND gate phase, wherein the voltage indication light-emitting diode is earthed through an overvoltage protection voltage-stabilizing diode and a sampling resistor and is connected with an NAND gate through a NOR gate; the NAND gate is connected with a coil of a relay J1 and parallel ports of a diode; the three-phase alternating current power supply is connected with a current converter, the rectifier, the amplifier and the NAND gate; therectifier is also connected with a phase failure memory circuit and a current phase failure indication light-emitting diode; and the NAND gate is connected with a coil of a relay J2 and parallel ports of the diode. The phase failure protector integrates the advantages of current collection type and voltage type phase failure protectors of the electric motors into a whole, is suitable for the phase failure, undervoltage and overvoltage protection of three-phase alternating current motors with different voltage classes and has the advantages of economy, practicability, simple structure, reliable performance and convenient operation.
Description
technical field [0001] The invention relates to a phase failure protector for a motor which uses two signals of current and voltage to act simultaneously for phase failure protection. Background technique [0002] At present, the common motor phase failure protectors are mostly current type, and recently a simple voltage type has also been proposed. However, the use of the above two open-phase protectors is limited by the operation and installation location. For example, the current type must be delayed to avoid the influence of the starting current of the motor, and only respond to the increase of the current. Within the time delay (motor starting process), the motor will not be protected if the motor is started with a heavy load and a phase failure occurs. However, the pure voltage type cannot protect the phase failure after the protector is connected. Contents of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the prior a...
Claims
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IPC IPC(8): H02H7/09
Inventor 赵新卫
Owner STATE GRID CORP OF CHINA