Intelligent low-voltage power capacitor

A low-voltage electric power and capacitor technology, which is applied in electrical components, emergency protection circuit devices, reactive power compensation, etc., can solve the problems of single capacitors without harmonic protection, capacitors burnt and damaged, and imperfect protection functions, etc., to achieve perfect protection functions , Reduce interference between internal signals, and compact structure

CN106451489AInactive Publication Date: 2017-02-22亚驰电力科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-02-22
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0032] See attached figure 1 to attach image 3 , an intelligent low-voltage power capacitor disclosed in the present invention includes a capacitor body 1 with a capacitor core 11 inside and a control device arranged at the top of the capacitor body 1. The capacitor body 1 includes a casing 12 and a capacitor set in the casing 12. The core 11 and the top cover 13 covering the top port of the casing 12, the top cover 13 is provided with wiring terminals (covered by an insulating cover in the figure, not shown), the control device includes a circuit breaker 2 for collecting The voltage and current signal acquisition circuit of the voltage on the phase line and the current signal are used to cut off or connect the switching mechanism of the circuit breaker 2 and the capacitor core 11, and the single-chip microcomputer 4; the voltage and current signal acquisition circuit includes a current transformer 31, a voltage mutual inductor device and signal acquisition integrated circui...