CN202502967U

CN202502967U - Residual current breaker

Info

Publication number: CN202502967U
Application number: CN201120489708XU
Authority: CN
Inventors: 郭子民
Original assignee: TAIYUAN SHIELD ELECTRONICS TECHNOLOGIES CO LTD
Current assignee: TAIYUAN SHIELD ELECTRONICS TECHNOLOGIES CO LTD
Priority date: 2011-11-28
Filing date: 2011-11-28
Publication date: 2012-10-24
Anticipated expiration: 2021-11-28

Abstract

The utility model, which belongs to the electronic field, discloses a residual current breaker, comprising a zero sequence current mutual inductor, a test resistor, a leakage current release, and an electronic assembly. The zero sequence current mutual inductor is electrically connected with an electronic assembly plate that is electrically connected with the leakage current release; the test resistor is connected with a phase line; a zero line terminal of the residual current breaker is connected with a zero line and a phase line terminal of the residual current breaker is connected with a phase line; and a filter capacitor is arranged between the phase line terminal of the residual current breaker and the zero line terminal of the residual current breaker. According to the utility model, the filter capacitor is arranged between the phase line terminal and the zero line terminal of the residual current breaker, so that an external interference of strong electric field can be led into the ground and thus the anti-interference capability of the residual current breaker can be enhanced. In addition, a filter capacitor is arranged at the input terminal of the electronic assembly to effectively inhibit that an external interference coupling voltage enters the electronic assembly, so that the coupling voltage will not enter the leakage current release to cause breaking and misoperation can not be made; therefore, the anti-interference capability of the residual current breaker can be further enhanced.

Description

A kind of RCCB

Technical field

The utility model relates to electronic applications, particularly a kind of RCCB.

Background technology

The RCCB of selling in the market and using is divided into two kinds of electronic type and electromagnetic types, and is wherein in the majority with the electronic type RCCB.Existing RCCB is equipped with anti-interference function, and generally being increases anti-interference function at the zero sequence current mutual inductor output.

In the prior art, the operation principle of RCCB is referring to Fig. 1, and internal structure is referring to Fig. 2 and Fig. 3; When in the circuit leakage current being arranged, when the residue operating current in the circuit reaches the operating current value, produce a signal in the secondary coil of zero sequence current mutual inductor; It is induced voltage; After the amplification through amplifier comparator, the leakage tripping device disjunction is also cut off the electricity supply, and plays the earth leakage protective effect.But, when there is high reject signal in the external world, because the circuit of RCCB is the amplifier comparator of a small-signal; The circuit input end strong jamming voltage signal that can be coupled, this signal coupling are added on the power supply lines, can induce the voltage greater than normal value on the zero sequence current mutual inductor; After the amplification of amplifier comparator, reach the threshold values of setting; Start leakage tripping device, the power supply of also can cutting off the electricity supply causes misoperation this moment.

In the reality; When RCCB is applied in intercom; There are strong-electromagnetic field interference signals such as frequency instability, clutter, harmonic component height when the external world, and during high-power, equipment work, as when about 0.5 meter of the RCCB; Power supply is cut off in the RCCB action, and each frequency range all directions of intercom all misoperation can occur.

In the process that realizes the utility model, the inventor finds that there is following problem at least in prior art:

There is the problem of poor anti jamming capability in the RCCB of prior art, and when there was the strong-electromagnetic field interference signal in the external world, RCCB was easy to generate misoperation, thereby cuts off power supply circuits.

The utility model content

For the existing above-mentioned defective of the RCCB that solves prior art, the utility model provides a kind of RCCB, this RCCB defencive function such as have electric leakage, transship and open circuit.Said technical scheme is following:

A kind of RCCB; Comprise zero sequence current mutual inductor, test resistance, leakage tripping device and electronic building brick, said zero sequence current mutual inductor is electrically connected said electric sub-member plate, and said electric sub-member plate is electrically connected said leakage tripping device; Said test resistance connects phase line; The zero line side of said RCCB connects zero line, and the phase line end of said RCCB connects phase line, is equipped with filter capacitor between the phase line end of said RCCB and the zero line side of said RCCB.

Preferred as technique scheme is equipped with a filter capacitor between each phase line end of said RCCB and the zero line side.

Preferred as technique scheme comprises amplifier comparator in the said electric sub-member plate, and the input of said amplifier comparator is provided with capacitor filter.

Preferred as technique scheme, the input of said amplifier comparator is provided with a plurality of capacitor filters.

Preferred as technique scheme, said electric sub-member plate and said zero sequence current mutual inductor outside are provided with a shielding box, and said shielding box shell is connected with zero line.

Preferred as technique scheme, the lead in the said RCCB is a flexible conductor.

The beneficial effect that the technical scheme that the utility model embodiment provides is brought is: through with line end mutually filter capacitor being set at the zero line side of RCCB, can the highfield in the external world being disturbed and import the earth, strengthen the antijamming capability of RCCB; In addition, filter capacitor is set, can effectively suppresses the external interference coupled voltages and get into electronic building brick, do not cause disjunction, can not produce misoperation thereby can not get into leakage tripping device through input at electronic building brick; And; Through amplifier comparator and neutral line current instrument transformer are placed in the shielding box, when producing electromagnetic interference, effectively shielded radioinduction effect to zero sequence current mutual inductor in the space; Avoid the disjunction of leakage tripping device simultaneously, strengthened the antijamming capability of RCCB.

Description of drawings

Fig. 1 is the fundamental diagram of the RCCB of prior art;

Fig. 2 is the internal structure sketch map of the RCCB of prior art;

Fig. 3 is another sketch map of internal structure of the RCCB of prior art;

Fig. 4 is the structural representation of the RCCB that provides among the utility model embodiment 1;

Fig. 5 is the sketch map of the shielding box that provides among the utility model embodiment 1;

Fig. 6 is the layout sketch map of the RCCB that provides among the utility model embodiment 1.

The primary clustering explanation:

1, zero sequence current mutual inductor 2, test resistance 3, leakage tripping device

4, electric sub-member plate 5, amplifier comparator 6, copper shell

Embodiment

For the purpose, technical scheme and the advantage that make the utility model is clearer, will combine accompanying drawing that the utility model execution mode is done to describe in detail further below.

Because the misoperation of RCCB is to receive due to the extraneous highfield interference in the prior art, the RCCB that present embodiment provides has taken into full account emc issue when circuit design and structural design, carried out electromagnetic Compatibility Design.

Referring to Fig. 4, the utility model provides a kind of RCCB, shown in RCCB comprise zero sequence current mutual inductor 1; Test resistance 2, leakage tripping device 3, electric sub-member plate 4 and filter capacitor; Said zero sequence current mutual inductor 1 is electrically connected electric sub-member plate 4, and said electric sub-member plate 4 is electrically connected leakage tripping device 3, and said test resistance 2 connects phase line; The zero line side of said RCCB connects zero line; The phase line end of said RCCB connects phase line, wherein, between the zero line side of the phase line end of said RCCB and said RCCB, is equipped with filter capacitor.

Wherein, in the present embodiment, between each the phase line end of RCCB and zero line side, install a filter capacitor additional, the interference signal that is coupled on the phase line is bypassed on the zero line, take the earth to, reduced the coupled interference of interference noise through ground wire.In the practical application, the zero line in the equipment of RCCB protection is linked to each other with this equipment, take interference signal to the earth through ground connection.As shown in Figure 4, between phase line A-A ' and zero line N-N ', install a filter capacitor C1 additional, install a filter capacitor C2 between phase line B-B ' and the zero line N-N ' additional, install a filter capacitor C3 between phase line C-C ' and the zero line N-N ' additional.

Particularly, comprise amplifier comparator 5 in the said electric sub-member plate 4, the amplifier comparator 5 that said zero sequence current mutual inductor 1 is electrically connected in the said electric sub-member plate 4, this amplifier comparator 5 is used for the voltage that neutral line current instrument transformer 1 induces is amplified.

In addition; Get into electric sub-member plate 4 in order to suppress the external interference coupled voltages, thereby can not get into the disjunction that leakage tripping device causes leakage tripping device, present embodiment is provided with one or more capacitor filters over the ground at the input of electric sub-member plate 4; That is to say; Input at amplifier comparator 5 is provided with one or more capacitor filters over the ground, and is as shown in Figure 4, is provided with two capacitor filtering capacitor C 4 and C5 at the input of amplifier comparator 5.

Preferably; Present embodiment also is provided with a shielding box in electric sub-member plate 4 and zero sequence current mutual inductor 1 outside; This shielding box shell is connected with zero line; Electric sub-member plate 4 and zero sequence current mutual inductor 1 are wrapped in the shield, thereby when producing electromagnetic interference, effectively shielded radioinduction effect zero sequence current mutual inductor in the space.Wherein, in the practical application, referring to Fig. 5 and Fig. 6, the shell of shielding box can be copper shell 6, and copper shell 6 coats electric sub-member plate 4 get up, and this copper shell 6 links to each other with zero line.

Preferably, the lead in this RCCB can adopt flexible conductor, and when the sectional area of flexible conductor equaled general red copper sectional area of wire, flexible conductor can not reduce the circuit amount of being passed through, and the flexible conductor utilization is installed.

In the practical application; When this RCCB was applied to intercom, even each frequency range of intercom is pressed close to RCCB, all directions all can not produce misoperation; Actual effect is good, and the RCCB in the present embodiment has been applied in a plurality of leakage protection equipment.

The RCCB that the utility model provides through with line end mutually filter capacitor being set at the zero line side of RCCB, can disturbing the highfield in the external world and import the earth, strengthen the antijamming capability of RCCB; In addition, filter capacitor is set, can effectively suppresses the external interference coupled voltages and get into electronic building brick, do not cause disjunction, can not produce misoperation thereby can not get into leakage tripping device through input at electronic building brick; And; Through amplifier comparator and neutral line current instrument transformer are placed in the shielding box, when producing electromagnetic interference, effectively shielded radioinduction effect to zero sequence current mutual inductor in the space; Avoid the disjunction of leakage tripping device simultaneously, strengthened the antijamming capability of RCCB.

What should explain at last is: above embodiment is only in order to the technical scheme of explanation the utility model, but not to its restriction; Although the utility model has been carried out detailed explanation with reference to previous embodiment; Those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of each embodiment technical scheme of essence disengaging the utility model of relevant art scheme.

Claims

1. RCCB; Comprise zero sequence current mutual inductor, test resistance, leakage tripping device and electronic building brick; Said zero sequence current mutual inductor is electrically connected said electric sub-member plate, and said electric sub-member plate is electrically connected said leakage tripping device, and said test resistance connects phase line; The zero line side of said RCCB connects zero line; The phase line end of said RCCB connects phase line, it is characterized in that, is equipped with filter capacitor between the phase line end of said RCCB and the zero line side of said RCCB.

2. RCCB as claimed in claim 1 is characterized in that, is equipped with a filter capacitor between each phase line end of said RCCB and the zero line side.

3. according to claim 1 or claim 2 RCCB is characterized in that comprise amplifier comparator in the said electric sub-member plate, the input of said amplifier comparator is provided with capacitor filter.

4. RCCB as claimed in claim 3 is characterized in that the input of said amplifier comparator is provided with a plurality of capacitor filters.

5. RCCB as claimed in claim 1 is characterized in that, said electric sub-member plate and said zero sequence current mutual inductor outside are provided with a shielding box, and said shielding box shell is connected with zero line.

6. RCCB as claimed in claim 1 is characterized in that, the lead in the said RCCB is a flexible conductor.