Power leakage protection method, system and remaining current protection breaker

Abstract

The invention discloses a power leakage protection method which comprises the following steps: S1) obtaining the instantaneous parameter of the remaining current from a main circuit; S2) according to the instantaneous parameter, calculating the phase angle of the remaining current; determining whether the phase angle jumps from the previous cycle or not; S3) if the phase angle jumps from the previous cycle, determining whether the phase angle is within the capacitive phase angle range or within the resistive phase angle range; if the phase angle is within the capacitive phase angle range, returning to the step S1; if the phase angle is within the resistive phase angle range, then proceed to step 4; S4) determining whether grounding impedance is reduced or not in a preset duration; S5) if the grounding impedance is reduced, starting protection to the remaining current; if the grounding impedance stays unchanged, then executing the step 6; and S6) determining whether the sudden change amount of the remaining current exceeds the set value or not; if the answer is yes, starting protection to the remaining current; and if the answer is no, returning to the step 1. In addition, the invention further discloses a power leakage protection system and a remaining current protection breaker which could achieve the same technical effects as the above.

Description

technical field [0001] The invention relates to the technical field of leakage protection, in particular to a method and system for leakage protection and a residual current protection circuit breaker. Background technique [0002] With the advancement of science and technology and the continuous development of the economy, people's living standards have been greatly improved, and electrical equipment is becoming more and more complex, especially electrical equipment with a large number of electronic components, such as computers, electronic office equipment and household appliances Wait. In the process of using electricity, personal electric shock and fire accidents caused by the defects of electrical equipment itself, improper use and unfavorable safety technical measures have brought undue losses to people's lives and property, and the leakage protection circuit breaker It provides reliable and effective technical means to prevent various accidents and protect equipment ...

AI Technical Summary

Problems solved by technology

However, in actual use, no matter whether the protection principle of pulse action type, amplitude detection phase detection type or current separation type is adopted, its action characteristics are easily affected by the defects of poor sensitivity, linearity, zero drift, temperature performance and stability. Influenced by factors such as voltage, climatic conditions, environmental electromagnetic interference, and load characteristics, the upper and lower residual current protection protection settings cannot be adjusted and matched, which often leads to frequent misoperation and refusal of leakage protection, resulting in the inability of long-term safe and stable operation of the low-voltage power distribution system

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