Electric energy meter leakage current detection system and leakage current detection method

Abstract

An electric energy meter leakage current detection system comprises a relay and a mutual inductor; the relay is connected with a first conducting strip and a second conducting strip, the first conducting strip and the second conducting strip are connected with a first wiring terminal and a second wiring terminal respectively, the first wiring terminal corresponds to a live wire inlet wire, and thesecond wiring terminal corresponds to a live wire outlet wire; the primary side of the mutual inductor is provided with two input ends, the mutual inductor is arranged on the second conducting stripin a sleeved way, the second conducting strip is correspondingly connected with one input end of the primary side of the mutual inductor, the other input end of the primary side of the mutual inductoris also connected with a third conducting strip, and the third conducting strip is connected with a third wiring terminal; and the third wiring terminal is correspondingly connected with a zero lineincoming line, and the secondary side of the mutual inductor is connected with a metering chip in the electric energy meter. The invention further discloses a method for detecting the leakage currentby applying the detection system. The detection system is simple in structure, whether leakage current is generated or not can be judged through the induced electromotive force of the mutual inductor,and the detection process is simple and easy to implement.

Description

technical field [0001] The invention relates to the field of electric energy meters, in particular to an electric energy meter leakage current detection system and a leakage current detection method. Background technique [0002] At present, according to the technical specifications of the State Grid and the Southern Power Grid, the electric energy meter does not consider the safety accidents that may be caused by the electrical grounding and leakage of residential users. At present, the safety protection work of the electric energy meter is mainly carried out by the leakage protection relay. The leakage protection relay refers to the leakage protection device with the function of detecting and judging the leakage current. When there is a leakage current in the main circuit, since the auxiliary contact and the separation release of the main circuit switch are connected in series to form a circuit, the auxiliary contact is connected to the separation trip. Disconnect the air ...

AI Technical Summary

Problems solved by technology

At present, leakage protectors are generally purchased and installed by resident users, but there are the following problems: 1. There are many brands, and the product quality varies; 2. The cost is high; 3. The volume is large and the installation is inconvenient

However, in this method, it is necessary to calculate and analyze the leakage current according to the data related to the judgment of the leakage current in the smart energy meter and the package data read by the concentrator. The leakage current detection method in this method is complicated to operate and has a large amount of calculation data , so it needs to be further improved

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