Electric energy meter external circuit breaker

Abstract

The invention discloses an external breaker of an electric energy meter. The breaker comprises a casing, an electric operation module, a multi-level breaker, an opening / closing operation mechanism, a driving motor, a deceleration mechanism, a clutch mechanism and a closing shaft; the electric operation module is provided with a switching button which can move in a slot and makes contact with or is separated from a microswitch; the external breaker further comprises a transparent lock piece, one end of the transparent lock piece is hinged to a casing of the electric operation module, and the other end of the transparent lock piece is buckled to the electric operation module and wraps the switching button; the switching button comprises an elastic plate and a pressure plate, the elastic plate is provided with a toggle joint in the top side and an extrusion boss in the side surface, the top side of the toggle joint is not higher than that of the slot, and the inner wall of the slot is provided with limiting projections; and the clutch mechanism comprises a driving gear and a driven gear, a spring is arranged between the driven gear and the casing, one end of the closing shaft is fixed to the axial center of the driving gear, the other end of the closing shaft is connected with a breaker handle a deceleration gear is provided with protruded columns, and an opening lever is pushed by the protruded columns and thus drives a tripping rod of the breaker to move to realize opening.

Description

technical field [0001] The invention relates to a circuit breaker, in particular to an external circuit breaker for an electric energy meter. Background technique [0002] At present, State Grid Corporation of China and China Southern Power Grid Corporation have launched a circuit breaker with remote automatic opening and closing in order to solve the control needs of cost-controlled electric energy meters. In addition to the short-circuit and overload protection functions of traditional circuit breakers, the circuit breaker can also According to the closing and opening command issued by the master station, the circuit breaker performs the corresponding closing and opening function. This function is embodied in that after closing, the circuit breaker can still be closed and opened semi-automatically. The inventor has found that the current circuit breakers on the market have the following defects: [0003] First, closing and opening control is mostly driven by a DC motor, w...

AI Technical Summary

Problems solved by technology

The moving and static contacts of the circuit breaker are in the non-electrically safe isolation distance position, which will cause a major safety hazard for the next call

In addition, the function of allowing semi-automatic closing and opening after remote closing is currently realized. After the driving gear completes the closing action, the force applying part of the driving gear is rotated in the opposite direction, away from the force point of the handle, so that the power is separated. The circuit mode has the following defects: 1. The control logic is more complicated; 2. Due to the completion of an instruction, the motor needs to perform frequent positive and negative rotations, which reduces the reliability of the motor, which may seriously cause the motor to burn out and cause an electrical fire accident; 3. If When the position detection fails, the gears will be blocked. If no one is on duty, the blocked rotation will cause the entire product to fail and cause the motor to burn out.

However, most of the products that can meet this function on the market are complex in structure and not high in reliability.

[0004] Second, the switching buttons of the external circuit breaker of the electric energy meter are all directly set on the front of the switch, but there is a defect that the switching of the mode switch can be realized without opening the meter box door

Changing the default state easily by the user has two effects

The first will increase because the semi-automatic mode switch does not have the automatic closing function. If it is accidentally switched to a semi-automatic situation in an automatic situation, the power grid company cannot effectively monitor the power transmission status and increase the workload of the power grid company.

The second is to switch from semi-automatic to fully automatic, indicating that the working environment is not suitable for automatic power supply. At this time, if the switch is automatically closed, it will cause potential electric shock accidents.

It is easy for the user to touch the toggle switch by mistake during use, causing the circuit breaker to switch the operation mode

If the operation mode is mistakenly switched from automatic to semi-automatic, the power grid company will not be able to effectively monitor the power transmission status, which will increase the workload of the power grid company

If the working environment requires semi-automatic operation, but switches to fully automatic by mistake, it means that the working environment is not suitable for automatic power supply. At this time, if the switch is automatically closed, it will cause potential electric shock accidents.

At the same time, because the circuit board is close to the surface of the shell, the electrical clearance and creepage distance are small, which brings safety hazards to the circuit breaker operator.

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