Intelligent controller of frame circuit breaker

Abstract

The invention relates to an intelligent controller of a frame circuit breaker with high reliability and security and low production cost. The intelligent controller of the frame circuit breaker comprises a microcontroller, a current signal conditioning module connected with the microcontroller, a voltage signal conditioning module, a transformer off-line detection module, a frequency detection module, a keyboard, a display module, an execution mechanism driving module and a relay output module, wherein the current signal conditioning module and the voltage signal conditioning module are connected with the output ends of a current transformer and a voltage transformer respectively. The intelligent controller of the frame circuit breaker realizes the functions realized by hardware in like products by using a digital method, greatly simplifies circuit hardware, and reduces the number of components so as to improve the reliability of the system and reduce the production cost. In the design aspect of a power supply circuit, the adoption of a DC / DC voltage-stabilizing circuit with hysteresis property remarkably improves the efficiency of the power supply so as to obviously reduce the temperature rise of a product.

Description

technical field [0001] The invention relates to an intelligent controller of a frame circuit breaker. Background technique [0002] As the basic equipment for power distribution protection, circuit breakers play a very important role in the safe and stable operation of the power grid. Reliability is one of the four basic requirements of the power distribution protection system, which requires equipment with a higher reliability index than the power grid itself, so the reliability of the circuit breaker is particularly important. The intelligent controller is the core component for the correct function of the circuit breaker. Therefore, the reliability requirements for the intelligent controller are particularly strict. [0003] A smart controller is a typical electronic product. According to the basic theory of electronic product reliability, product reliability is affected by four factors: the quality, quantity, temperature rise and use environment of the components used....

AI Technical Summary

Problems solved by technology

This circuit has two major disadvantages: first, when the input signal jumps, its signal output has an overshoot phenomenon, which will cause current misjudgment; second, the circuit is essentially an integrator, which requires high capacitance, and Commonly used ordinary capacitance itself has a large dispersion, thus reducing the measurement accuracy

This design method has two defects: first, the circuit structure is complex, the number of components is large, the cost is high, and the reliability is low

The resistance divider circuit Me converts the input strong current (220V or 380V) into a weak current (a voltage compatible with the ADC reference voltage) through resistance division. This method does not realize the isolation of strong current and weak current, reducing product safety

[0011] In addition, the existing similar circuit breaker intelligent controllers generally use a linear voltage regulator circuit or a DC / DC voltage regulator circuit without hysteresis characteristics for their power supply systems. , resulting in reduced system reliability

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