The motor protection measurement and control device is an intelligent electronic device that integrates protection, measurement, control, and communication. It is widely used in the industrial field, especially in the circuits of high-voltage (such as 6kV, 10kV) and high-power low-voltage motors. As the "intelligent guardian" and "operation manager" of motors, it ensures the safe, stable, and efficient operation of this core power equipment.
working principle
Its core is a high-performance microprocessor (MCU or DSP), and its working principle can be simplified as:
Signal acquisition: Collect analog signals of the motor main circuit through internal current transformers (CT) and voltage transformers (PT).
Signal processing: Convert the collected large signal into a small signal, and then convert it into a digital signal through an A/D converter.
Computational analysis: The microprocessor performs real-time computation and logical judgment on digital signals based on built-in protection algorithms and fixed values (user set action thresholds and times).
Output execution:
When it is judged as a fault, the microprocessor drives the outlet relay to act, sends a trip signal, and cuts off the circuit breaker.
At the same time, update the measurement data display, store event records, and upload information to the backend system through communication interfaces.