CN102412556A

CN102412556A - Grounding current protective function module for circuit breaker

Info

Publication number: CN102412556A
Application number: CN2011103774585A
Authority: CN
Inventors: 史祺; 暴凤蓉; 黎明; 刘健勇; 高辉
Original assignee: Tianjin Baili Electronic Co Ltd
Current assignee: Tianjin Baili Electronic Co Ltd
Priority date: 2011-11-24
Filing date: 2011-11-24
Publication date: 2012-04-11

Abstract

The invention relates to a grounding current protective function module for a circuit breaker. The grounding current protective function module comprises a current transformer, an electronic circuit I, an electronic circuit II, a central processor, a parameter adjusting display circuit and an executing circuit, wherein the current transformer is used for sampling a grounding current value in a protective circuit; the current transformer is used for amplifying a weak voltage signal through a branch gear of the electronic circuit I, transmitting to the central processor, and inputting into the electronic circuit II; the electronic circuit II is used for transmitting a signal subjected to anti-interference restraining processing into the central processor; and the central processor is used for exchanging a signal with the parameter adjusting display circuit and sending an execution command to the executing circuit. Due to the adoption of a standard grounding sampling signal current transformer, the sampling signal is stable and reliable when the current passes through a conductor, and the signal sampling accuracy of an intelligent controller is increased. The sampling signal can be directly transmitted to the central the central processor, so that high stability and high universality are realized; the grounding current protective function module can be applied to various circuit breakers needing grounding protection; and a structure can be designed uniformly, so that the production cost is lowered.

Description

The earth current defencive function module of circuit breaker

Technical field

The invention belongs to a kind of parts of circuit breaker, particularly relate to a kind of earth current defencive function module of circuit breaker.

Background technology

The general current transformer that adopts of the earth current of conventional circuit breaker protection at present directly is connected with intelligent controller; The method for designing of generally using all need be with earth current instrument transformer and controller matching Design; The essential intelligent controller circuit breaker that uses of earth current protection; Therefore need repetition test, cause the waste of a large amount of design cost and design time.So also cause current transformer output signal single, the intelligent controller signal judges that simple nothing shows problems such as adjustment function.

Summary of the invention

The present invention provides a kind of earth current defencive function module that can independently be grounded the circuit breaker of current protecting function for solving the technical problem that exists in the known technology.

The technical scheme that the present invention takes for the technical problem that exists in the solution known technology is: it includes the current transformer of earth current value in the real-time sampling protection circuit, and it also includes the electronic circuit one that carries out the stepping processing and amplifying, electronic circuit two, central processing unit, parameter adjustment display circuit and the executive circuit that can carry out anti-interference inhibition processing; Described current transformer presses signal through the described central processing unit of entering after the described electronic circuit one stepping processing and amplifying light current that induces, and simultaneously signal is imported described electronic circuit two; Described electronic circuit two will be imported described central processing unit through the signal after anti-interference suppresses to handle; Described central processing unit and parameter adjustment circuit carry out handshaking, and described central processing unit sends signal and gives described parameter adjustment display circuit and send instruction execution signal and input to described execution circuit.

Advantage and good effect that the present invention has are:

1. owing to adopted the ground connection sampled signal current transformer of standard, sampled signal was reliable and stable when electric current passed through conductor, had improved the signal sampling precision of intelligent controller.Sampled signal can directly be sent to central processing unit, and stability is strong, and versatility is good.

2. this module can replace the earth current defencive function in the traditional intelligence controller, applicable to the various circuit breakers that need ground protection.

3. this earth current protection module can be unified project organization, has not only reduced repeated labor and has also reduced production cost.

Description of drawings

Fig. 1 is circuit theory diagrams of the present invention;

Fig. 2 is a modular structure sketch map of the present invention.

Embodiment

For further understanding content of the present invention, characteristics and effect, the following examples of giving an example now, and conjunction with figs. specifies as follows:

As shown in Figure 1, the current transformer 1 of earth current value is pressed AC signal input electronic circuit one with the light current that induces in the real-time sampling protection circuit; Electronic circuit one (comprising stepping Dian Lu ﹑ amplifying circuit) also is input to electronic circuit two simultaneously with being input to central processor MCU after the signal stepping processing and amplifying; Electronic circuit two (comprising the frequency-selecting circuit) will be through the signal input central processor MCU after anti-interference suppresses to handle; Central processor MCU (data processing) is sent signal and is given parameter adjustment display circuit (shows signal output) after carrying out handshaking (setting the input of protection parameter) with parameter adjustment circuit (toggle switch).Central processor MCU is sent execution command and is given execution circuit (relay).

As shown in Figure 2, this is a module that possesses the earth current defencive function.It includes the current transformer 1 of earth current value in the real-time sampling protection circuit by one and is made up of jointly the singlechip controller 2 that electronic circuit one, two, central processing unit, parameter adjustment display circuit and executive circuit constitute.Conductor 4 is energising major loop joint covers.Current transformer 1 is assemblied in the shell 3 with single-chip microprocessor MCU controller 2.Conductor 4 connects major loop.When conductor 4 through certain ampere numerical value electric current, singlechip controller 2 produces the corresponding signal collections, and judges whether the main circuit current value has the earth current fault to take place, and shows that the earth current fault value produces signal simultaneously and makes outage of energising actuating equipment or warning.

Claims

1. the earth current defencive function module of a circuit breaker; It includes the current transformer of earth current value in the real-time sampling protection circuit, and it is characterized in that: further comprising has the electronic circuit one that carries out the stepping processing and amplifying, electronic circuit two, central processing unit, parameter adjustment display circuit and the executive circuit that can carry out anti-interference inhibition processing; Described current transformer presses signal through the described central processing unit of entering after the described electronic circuit one stepping processing and amplifying light current that induces, and simultaneously signal is imported described electronic circuit two; Described electronic circuit two will be imported described central processing unit through the signal after anti-interference suppresses to handle; Described central processing unit and parameter adjustment circuit carry out handshaking, and described central processing unit sends signal and gives described parameter adjustment display circuit and send instruction execution signal and input to described execution circuit.