Voltage and current vector relation based on residual current detection method

Abstract

The invention discloses a voltage and current vector relation based on residual current detection method which is especially used for simultaneously detecting residual voltage and residual current and utilizing the voltage and residual current vector relation to judge whether residual current is harmful or not, namely judge whether the residual current causes lethal influence on people or lethal. According to the voltage and current vector relation based on residual current detection method, orthogonal decomposition is conducted on a residual current vector according to voltage vector direction, it is shown that the residual current has harmful components when a product of a parallel component of the residual current vector and a voltage vector is not 0, and a corresponding protection indication is needed to be made when the sum of the harmful components of harmonic components of the residual current exceeds a limit value which can be borne by the people or the livestock. The voltage and current vector relation based on residual current detection method is accurate in metering and high in reliability, can be used in the relevant fields of residual current detection, monitoring, electric leakage protection devices and the like and has very wide prospect.

Description

technical field [0001] The invention relates to the technical field of circuit safety protection and detection, and specifically refers to a method for detecting residual current, especially by judging the impedance characteristics of the medium through which the residual current flows, that is, by judging the vector relationship between residual current and voltage to determine the harmful residual current. A Detection Method of Current Size Background technique [0002] Since the invention and use of electricity, electricity has not only brought a lot of convenience to human beings, but also brought certain harm to human beings. It may burn out equipment and electrical appliances, cause fires, and cause electric shock casualties. Most of the accidents The main culprit is the residual current, which requires a method to effectively detect whether there is residual current in the circuit. The residual current protector is a device with residual current detection and judgmen...

AI Technical Summary

Problems solved by technology

Both the pulse type and phase and amplitude detection residual current protectors judge whether there is residual current by detecting the sudden change of current. The current protector cannot be effectively detected, so it refuses to operate, which may cause danger

This traditional detection method is only a relative detection of sudden changes in current, and cannot detect the absolute value of residual current. Therefore, a reliable and effective detection method that can detect the absolute amount of residual current is urgently needed to ensure personal and property safety.

Although the traditional current-type residual current protector detects the absolute amount of residual current, it cannot effectively distinguish which residual current will cause danger, so it will frequently malfunction and the anti-interference ability is too poor

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