Three-phase four-wire system electric energy quantifier with overload protection

Abstract

The invention relates to a three phase four wire system electric energy quantifier which has overload protection, belonging to the electric energy quantifier. A voltage comparator of the electric energy quantifier is connected with a central controller; a flow detector is simultaneously connected with the central controller and a meter reading control module; the central controller is simultaneously connected with a displayer, the meter reading control module and a broken circuit controller; and a power supply is connected with the central controller, the voltage comparator, the broken circuit controller, the flow detector and the meter reading control module. The electric energy quantifier has the advantages that: in the distribution circuit of electric energy metering, the electric energy quantifier has the overvoltage protecting function, a bipolar bi-wire leakage circuit breaker with overvoltage protection is arranged at the master circuit breaker of an in-house distribution box, which can automatically cut off electricity when the voltage exceeds a preset setting range and can automatically restore power supply within a preset interval time, thus guaranteeing the safe electricity use of electric appliances; the electric energy quantifier has good technology, safe and reliable work, convenient use, reasonable manufacturing and material selection, low cost and wide application range.

Description

technical field [0001] The invention relates to an electric energy meter used in residential quarters, in particular to a three-phase four-wire electric energy meter with overload protection. Background technique [0002] At present, people begin to use a large number of household appliances in residential quarters. The household appliances are all single-phase power consumption. In certain specific time periods, the high-load power consumption of household appliances makes the three-phase load of the power supply seriously unbalanced. The zero line current is too large and blows out, so the voltage is changed from 220V line voltage to 380V high voltage instantaneously, causing various electrical appliances in the power grid to burn out due to excessive power supply voltage. [0003] Reason for overvoltage: The external power supply is powered by three-phase four-wire mode. Let L1, L2, and L3 be phase wires, occupying 3 wires, and N being the neutral wire, occupying one wire...

AI Technical Summary

Problems solved by technology

The problem of unbalanced three-phase power supply in the power grid always exists. Serious three-phase unbalanced power supply will cause the zero line current to be too large and blown out

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