Capacitor selection method and device for three-phase AC phase sequence detection circuit

By setting the reactance ratio parameter value and adjusting the load voltage in the three-phase AC phase sequence detection circuit, the problem of discontinuous capacitor selection is solved, the safety and stability of the equipment are achieved, and the long-term working requirements are met.

CN115128369BActive Publication Date: 2025-03-28CERI DIGITAL TECHNOLOGY (BEIJING) CO LTD +1
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Patent Information

Application Number
CN202210806547.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-07-08
Publication Date
2025-03-28
Estimated Expiration
2042-07-08

AI Technical Summary

Technical Problem

The existing three-phase alternating current phase sequence detection circuit has problems such as discontinuous and inability to select arbitrarily in capacitance, which is difficult to meet the safety and stability requirements of the equipment.

Method used

By obtaining the power phase voltage and incandescent lamp power of the three-phase alternating current phase sequence detection circuit, setting the reactance ratio parameter value, calculating the three-phase load voltage, and adjusting it according to the preset load voltage parameter value until it does not exceed the preset value, thereby determining the capacitance value.

Benefits of technology

Ensure that the equipment working voltage meets long-term working requirements, achieves safety and stability, and ensures that the equipment work is safer and more stable for long-term work when the brightness difference of incandescent lamps is large enough.

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Abstract

The present invention discloses a method and device for selecting capacitance of a three-phase alternating current phase sequence detection circuit, wherein the method comprises: obtaining the power supply phase voltage and incandescent lamp power of the three-phase alternating current phase sequence detection circuit; setting a reactance ratio parameter value, and calculating the three-phase load voltage according to the set reactance ratio parameter value and the power supply phase voltage; comparing the three-phase load voltage with a preset load voltage parameter value, and if the three-phase load voltage exceeds the preset load voltage parameter value, resetting the reactance ratio parameter value and calculating the three-phase load voltage according to the re-set reactance ratio parameter value and the power supply phase voltage, until the three-phase load voltage does not exceed the preset load voltage parameter value; determining the capacitance value of the three-phase alternating current phase sequence detection circuit according to the reactance ratio parameter value, the power supply voltage and the incandescent lamp power. The present invention can select capacitance of the three-phase alternating current phase sequence detection circuit, ensure that the equipment working voltage meets the long-term working requirements, and achieve safety and stability.
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