Intelligent low-voltage power capacitor

Abstract

The invention relates to an intelligent low-voltage power capacitor comprising a capacitor body with a capacitor core and a control unit. The control unit consists of a circuit breaker, a voltage and current signal acquisition circuit, a switching mechanism and a single-chip microcomputer. A signal filtering and shaping circuit, an A / D conversion unit, a logic protection calculation unit, a zero-crossing capturing circuit and a zero-crossing switching control unit are arranged inside the single-chip microcomputer in an integrated mode. The logic protection calculation unit including a logic operation module, a storage module and a comparison module is used for calculation to obtain a voltage, a current, an active power, a reactive power, a power factor, and a harmonic quantity and controlling the zero-crossing switching control unit to execute capacitor core cutting for the switching mechanism when the voltage, current and harmonic quantity exceeds standards, thereby realizing over-voltage, under-voltage, and harmonic protection. Therefore, on the basis of reactive compensation logic, the switching mechanism is controlled to execute zero-crossing switching based on zero-crossing determination, thereby realizing reactive compensation. According to the intelligent low-voltage power capacitor provided by the invention, harmonic, voltage and current protection is realized based on the logic operation of the single-chip microcomputer; and the intelligent low-voltage power capacitor has advantages of complete protection functions and compact structure.

Description

technical field [0001] The invention relates to the technical field of power equipment, specifically a power capacitor. Background technique [0002] Smart capacitor is an intelligent reactive power compensation device integrating modern measurement and control, power electronics, network communication, automation control, power capacitor and other advanced technologies. It has better compensation effect, smaller size, lower power consumption and cheaper price. It is characterized by more flexible use, more convenient maintenance, longer service life and higher reliability. It changes the traditional reactive power compensation device's backward controller technology and backward mechanical switching or electromechanical integration switch as the switching technology of switching capacitors. [0003] The existing smart capacitors of various manufacturers in the market are more or less imperfect in technology: such as imperfect protection functions: no temperature protection...

AI Technical Summary

Problems solved by technology

[0003] The existing smart capacitors of various manufacturers in the market are more or less imperfect in technology: such as imperfect protection functions: no temperature protection; each single capacitor does not have its own harmonic protection; no current protection; the above These defects can cause capacitors to burn out and damage

The communication adopts the traditional 485 bus, the communication is slow and the efficiency is low

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