Development Analysis of Motor Integrated Protector
The motor integrated protector was first used in China since the 1980s. At that time, it was mainly based on electronic components and integrated circuits. It used three current transformers to detect the load current, and performed calculations, difference comparisons and simple logic judgments in the circuit. The relay is actuated to protect the motor in the event of overload, phase loss, phase failure and power imbalance. Due to the unreliability of the components and the comparison of the single in the circuit, the operation protection circuit is often malfunctioned and refused to occur, and this technical result has not been promoted and applied.
At present, the motor integrated protector collects signals such as three-phase AC power, voltage, zero-sequence current, thermal resistance value, 4-20 mA simulator and multi-channel switching, and passes the anti-interference and digital-to-analog conversion of the signal processing circuit. It is calculated and processed by the CPU. According to various protection characteristics, measurement data, control logic and data transmission requirements, it can be realized by various means such as indicator light, display port, control and protection output interface, 4-20mA simulator output, etc. Intelligent protection measurement and control functions required for motor applications.
The advancement of the motor integrated protector is through the 16-bit industrial-grade microprocessor CPU and network technology through the control software to intelligently process the collected signals and output signals, and achieve the low-voltage comprehensive protection of intelligent protection, fault maintenance, control and measurement. Device.
The motor integrated protector was first used in China since the 1980s. At that time, it was mainly based on electronic components and integrated circuits. It used three current transformers to detect the load current, and performed calculations, difference comparisons and simple logic judgments in the circuit. The relay is actuated to protect the motor in the event of overload, phase loss, phase failure and power imbalance. Due to the unreliability of the components and the comparison of the single in the circuit, the operation protection circuit is often malfunctioned and refused to occur, and this technical result has not been promoted and applied.
At present, the motor integrated protector collects signals such as three-phase AC power, voltage, zero-sequence current, thermal resistance value, 4-20 mA simulator and multi-channel switching, and passes the anti-interference and digital-to-analog conversion of the signal processing circuit. It is calculated and processed by the CPU. According to various protection characteristics, measurement data, control logic and data transmission requirements, it can be realized by various means such as indicator light, display port, control and protection output interface, 4-20mA simulator output, etc. Intelligent protection measurement and control functions required for motor applications.
The advancement of the motor integrated protector is through the 16-bit industrial-grade microprocessor CPU and network technology through the control software to intelligently process the collected signals and output signals, and achieve the low-voltage comprehensive protection of intelligent protection, fault maintenance, control and measurement. Device.
