External circuit breaker tripping control device of electric energy meter

Abstract

The invention discloses an external circuit breaker tripping control device of an electric energy meter. The external circuit breaker tripping control device comprises an electric operating unit and more than one circuit breaker unit. The loop of each circuit breaker unit is provided with a wiring board. The wiring board is a shunting component for detecting current. The shunting part of the wiring board is connected with a sampling current lead and performs sampling on a current signal in a sampling loop. A current signal is transmitted to a main wiring board of an electric operating unit. The main wiring board performs analysis and comparison on a detected current signal, thereby determining a normal load current or an overload current. On the condition that the current is the overload current, a CPU on a main circuit board transmits a tripping instruction, thereby driving an electric operating mechanism to trigger tripping of the circuit breaker and realizing overload protection of the circuit breaker. According to the external circuit breaker tripping control device, a bimetallic strip and related components in a traditional circuit breaker are replaced, and a circuit board is utilized for performing overcurrrent determining, thereby realizing higher protection precision, no debugging on the circuit breaker and high convenience in production.

Description

technical field [0001] The invention discloses a tripping control device for an external circuit breaker of an electric energy meter, which belongs to the technical field of circuit breaker manufacturing according to the International Patent Classification (IPC). Background technique [0002] The external circuit breaker of the electric energy meter is a key device to cooperate with the smart electric energy meter to realize the intelligent fee control function. The external circuit breaker of the electric energy meter needs to comply with the technical specifications of the State Grid (Q / GDW11421-2015) and the technical specifications of the China Southern Power Grid. The existing electric energy meter external circuit breaker adopts the principle of thermal tripper for overload protection, and the thermal element adopts bimetallic strips, and cooperates with soft connections connected to bimetallic strips, debugging screws, nuts, etc. for long-time delay protection, but Th...

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Problems solved by technology

The existing electric energy meter external circuit breaker adopts the principle of thermal tripper for overload protection, and the thermal element adopts bimetallic strips, and cooperates with soft connections connected to bimetallic strips, debugging screws, nuts, etc. for long-time delay protection, but The installation and debugging of the bimetal sheet is cumbersome. For example, the metal sheet is prone to irreversible bending when it is welded with related components during installation. The unreliable positioning during the welding process makes the positioning of the metal sheet in the product inaccurate, and it is easy to interfere with other components. After the metal sheet is installed, the zero position of the working end needs to be adjusted. At this time, special tools are required. Therefore, the existing circuit breaker is equipped with a bimetal sheet, which has low efficiency. Ambient temperature requirements for nationwide use as required by the National Grid

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