CN201134666Y

CN201134666Y - Overcurrent protecting electronic control apparatus for small circuit breaker

Info

Publication number: CN201134666Y
Application number: CNU200720015338XU
Authority: CN
Inventors: 于江涛
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-10-18
Filing date: 2007-10-18
Publication date: 2008-10-15
Anticipated expiration: 2017-10-18

Abstract

The utility model relates to a small-sized chopper over current protection electronic control device which is suitable for households or similar occasions, which is provided with a low current mutual inductor which is under 5A to detect heavy current. The existing zero-sequence current mutual inductor, a residual current mutual inductor and the like are utilized. When current flow passes through a circuit, current flow signals which are detected by the low current mutual inductor are input into an electronic control device, a small-sized chopper is disconnected to plat a protective function. The small-sized chopper over current protection electronic control device can have the earth leakage protection function.

Description

Miniature circuit breaker overcurrent protection electronic-controlled installation

Affiliated technical field

The utility model relates to a kind of miniature circuit breaker overcurrent protection electronic-controlled installation that is suitable for.

Background technology

Current, as to have overcurrent protection miniature circuit breaker, all adopt following 2 kinds of forms:

1, instant over current protection, short-circuit protection all adopt iron core to add the external electromagnetic coil structure,

2, overload protection all adopts the bimetal leaf structure.

Above-mentioned these 2 kinds of structures all have consume material, and the power consumption heating respectively has a cover tripping mechanism, makes the miniature circuit breaker volume big, complex structure, the deficiency of job insecurity.

Summary of the invention

For solving the deficiency of said structure, the utility model designs a kind of overcurrent protection electronic-controlled installation of suitable miniature circuit breaker, has the saving material, does not generate heat, and a shared cover tripping mechanism is applicable to 2 utmost points; 3 utmost points; 4 minimal type circuit breaker overcurrent protections.

The technical scheme that its technical problem that solves the utility model adopts is: use the following small current mutual inductor of 5A to detect big electric current.As utilize existing zero sequence current mutual inductor, residual current transformer etc.For example the centre bore at zero sequence current mutual inductor passes lead L and the N line that flows through load current; one section lead with resistance R 1 or connection electrical resistance R1 is called shunt line; the shunt line two ends keep at a certain distance away and the L line of zero sequence current mutual inductor both sides or N line connect; resistance between 2 tie-points of L line or N line is R2; this structure promptly has creepage protection function, and excess current protective function is also arranged simultaneously.Another kind of version is for to pass the centre bore of shunt line from zero sequence current mutual inductor, and the shunt line two ends keep at a certain distance away and L line or the connection of N line, and the resistance on L line or the N line between 2 tie-points is R2, and this structure has only excess current protective function.

If the electric current I 1 that shunt line flows through is the threshold current of circuit operation; regulate R1; the resistance of R2; make when the electric current that flows through on L line or the N line is I2; I2 * R2/ (R1+R2)=I1 is arranged, promptly overcurrent be 〉=during I2, the action of miniature circuit breaker overcurrent protection electronic-controlled installation; cut-off breaker plays a protective role.

The beneficial effects of the utility model are: very thin with one; the iron core that very short shunt line has replaced instant over current protection to use adds the external electromagnetic coil structure and overload protection uses the bimetal leaf structure; an and shared cover tripping mechanism; have simple in structure; save material; improve control accuracy, can be used for automation control.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is a kind of structural representation of the present utility model.

Fig. 2 is an another kind of structural representation of the present utility model.

Fig. 3 is an electrical schematic diagram of the present utility model.

Among the figure 1, the L line is a phase line.2, shunt line.3, zero sequence current mutual inductor.4, the N line is the neutral line.

Embodiment

At first weld control circuit by Fig. 3 electrical schematic diagram, draw L from the output of miniature circuit breaker, the N line passes the centre bore of zero sequence current mutual inductor, connects shunt line by Fig. 1; Or draw L from the output of miniature circuit breaker, N line, shunt line pass the centre bore of zero sequence current mutual inductor, connect shunt line by Fig. 2.Zero sequence current mutual inductor is pressed Fig. 3 wiring, regulates shunt line resistance, can realize overcurrent protection; Earth leakage protective.

Claims

1; a kind of miniature circuit breaker overcurrent protection electronic-controlled installation; it is to use the following small current mutual inductor of 5A to detect big electric current; as utilize existing zero sequence current mutual inductor; residual current transformer etc.; it is characterized in that: the centre bore at small current mutual inductor passes lead L and the N line that flows through load current; one section lead with resistance or connection electrical resistance is called shunt line; the shunt line two ends keep at a certain distance away and the L line of zero sequence current mutual inductor both sides or N line connect; another kind of version is for to pass the centre bore of shunt line from small current mutual inductor; the shunt line two ends keep at a certain distance away and L line or N line connect; utilize the connection of shunt line on lead L that flows through load current or N line; get a certain proportion of electric current, generate current and voltage signals by small current mutual inductor and be added on control circuit, play the overcurrent protection effect.