CN103337429B

CN103337429B - Residual current action breaker

Info

Publication number: CN103337429B
Application number: CN201310271649.2A
Authority: CN
Inventors: 黄文体; 周毅亮; 李孔伏; 杜德安
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2013-07-01
Filing date: 2013-07-01
Publication date: 2015-11-18
Anticipated expiration: 2033-07-01
Also published as: CN103337429A

Abstract

The three-phase rectifier that residual current action breaker comprises zero sequence current mutual inductor, positive pole VCC, the earth polar O of its DC output end are connected with the positive pole of the power input of signal processing module and tripping driving device, earth polar respectively and test loop, the two ends that two pin of the signal input part of signal processing module export winding with the secondary side of current transformer are respectively connected.Test loop comprises the testing button open in usual be mutually connected in series, test winding and current-limiting resistance, its input is connected with the arbitrary phase firewire in main circuit, if testing button is single-break formula push-button switch, the direct current of the output termination three-phase rectifier of test loop exports the neutral line in earth polar or main circuit, if testing button is Double-breakpoint linked switch, its export the earth polar of termination three-phase rectifier or the N phase neutral line or from input connect another different phase firewire of phase firewire, so that the arbitrary phase firewire realized in test loop and main circuit under the nothing operation normality that push-button switch is often opened is completely isolated.

Description

Residual current action breaker

Technical field

The present invention relates to low-voltage circuit breaker field, be specifically related to a kind of residual current action breaker, for detecting residual current in a power distribution system.

Background technology

As everyone knows, when residual current (also claiming leakage current) reaches threshold value (i.e. the rated residual operating current value) that preset, residual current action breaker can produce dropout trip operation automatically, the generation of its residual current has many situations, such as in three-phase power distribution system, there is A residual current relatively, B residual current relatively, C residual current relatively, and the not common residual current over the ground of homophase, but very large deviation (hereinafter referred to as " deviation 1 ") can not be there is between final actual residual action current and threshold value, the residual action current value of circuit breaker reality is consistent with threshold value is for one of the most basic instructions for use of residual current action breaker, the real surplus operating current of existing residual current action breaker generally allows when dispatching from the factory to be arranged on more than 1/2nd of its rated residual operating current, but be also easily allow people ignore be for two of the most basic instructions for use of three-phase residual current action breaker, the A of existing residual current action breaker, B, there is larger deviation (hereinafter referred to as " deviation 2 ") in the residual action current value between C three-phase, i.e. A, B, when the residual action current that the consistency of the residual action current value between C three-phase need meet any phase reaches the threshold value of Uniform provisions, circuit breaker could produce the requirement of trip operation, can not because of the difference of phase line, and there is different residual action currents.Obviously, deviation 2 can directly have influence on deviation 1, therefore the important indicator of both earth leakage protective reliabilities of residual current action breaker.

In recent years, also must to play the regulation of its defencive function about the residual current action breaker when a certain phase phase shortage in order to meet concerned countries standard, existing 3 poles, 4 pole residual current action breakers are numerous and confused is extensively adopted as three-phase power taking from two-phase power taking, be integrated chip, tripping driving device, three ac input ends that test loop provides the rectified three-phase circuit of power supply respectively with A, B, C three-phase firewire connects, test loop is also from A simultaneously, B, power taking in C three-phase firewire, namely the two ends of test loop respectively with A, B, two phase firewires in C three-phase firewire connect.The problem of this scheme there is above-mentioned deviation 1 and the obvious phenomenon increased of deviation 2; particularly operating current level adjustment to 100mA or higher time; the phenomenon of deviation 2 can be more obvious; finally cause the instability of deviation 1; make the earth leakage protective reliability decrease of residual current action breaker, certain this deviation can limit movement current class be equally also the employing of the high sensitivity scheme of below 30mA.For this phenomenon, two mistake in understanding below ubiquity in the industry, one is that people often think that test loop does not have electric current when not having conducting, so it can not introduce the interference to secondary side output signal when designing.Two is that people often think when product test, much difference can not be there is in the residual action current value not between homopolarity, in the production process fast of existing circuit breaker, generally can not test the residual action current of each pole with comparison check measurement error 2, be therefore generally not easily found at circuit breaker production process large deviations 2 and paid attention to.But applicant proves through test, in test loop, voltage increases to cause the output of instrument transformer more significantly affects, and makes the residual action current value of its not homopolarity there is larger difference phenomenon.Because test loop is connected between the live wire of three-phase alternating current, even under the state not having electric current to flow through in test loop, as long as the coil in test loop is also connected in phase line, then alternating voltage still can make the coil in test loop export the secondary of instrument transformer and produce very important electromagnetic interference, this interference makes the secondary of instrument transformer output signal and produces obvious burr and spike, applicant finds, these burrs and spike result in deviation 2 and obviously increase just, the degree of its deviation size can change along with the technique of instrument transformer has randomness, so mislead existing control deviation 1, the countermeasure that deviation 2 adopts often is confined to improve machining accuracy aspect, both the problem of three-phase residual action current fluctuation had not been solved from its basic reason.

Summary of the invention

The object of the present invention is to provide a kind of residual current action breaker overcoming the above-mentioned prejudice of technology in the industry and technical problem, newly designed by succinct effective circuit structure, the phase voltage having stopped test loop introducing exports the electromagnetic interference produced to the secondary of instrument transformer, and ensure that the consistency of the residual action current value between three-phase, eliminate the fluctuation of three-phase residual action current to the consistency of residual current action breaker defencive function precision, the adverse effect of reliability, not only without the need to changing processing process, without the need to increasing production cost, and can not production efficiency be affected, the miniaturization of current transformer can not be affected, and can effectively reduce in scheduling and planning because current value deflects away from the rework rate of scope.

Realize above-mentioned purpose, present invention employs following technical scheme.

According to the residual current action breaker of one embodiment of the present invention, comprise the zero sequence current mutual inductor TA of the leakage current for detecting main circuit S, three ac input ends respectively with A, B, the three-phase rectifier 1 that C three-phase firewire connects, signal processing module 2, test loop 4 and control contact apparatus 3 produce the tripping driving device 5 of trip action, the positive pole VCC of the DC output end of described three-phase rectifier 1, earth polar O respectively with the positive pole of the power input of signal processing module 2 and tripping driving device 5, earth polar connects, the two ends that two pin of the signal input part of described signal processing module 2 export winding TA2 with the secondary side of current transformer TA are respectively connected, signal processing module 2 is for comparing the size of residual current signal of each phase in sensed main circuit S and the threshold value of preferred settings, and according to comparative result control tripping driving device 5, contact apparatus 3 tripped or maintain normal state of closing a floodgate.Described test loop 4 comprises the testing button open in usual be mutually connected in series, winding TA2 is exported respectively around the test winding 40 on the iron core TA1 of described instrument transformer and current-limiting resistance R with the secondary side of instrument transformer TA, the input 41 of described test loop 4 and the A phase of main circuit S being arranged in described instrument transformer inlet wire side, arbitrary phase firewire in B phase or C phase connects, described testing button is single-break formula push-button switch SB, the output 42 of described test loop 4 connects the N phase neutral line in the earth polar O of the DC output end of three-phase rectifier 1 or main circuit S, use the ground after rectification or the N phase neutral line as the access point of the test winding 40 around the test loop 4 on instrument transformer, so that the test winding 40 realizing test loop 4 under the nothing operation normality that the breakpoint T0 of push-button switch SB often opens is completely isolated with the arbitrary phase firewire in main circuit S.

Further, the breakpoint T0 of described single-break formula push-button switch SB is arranged on the termination of the input 41 of test loop 4, and it act as and ensures that the breakpoint T0 of push-button switch SB can separate the terminals 401 of arbitrary phase firewire with test winding 40 under normally open.

Preferably, the secondary side of described instrument transformer exports test winding 40 employing of winding TA2 and test loop 4 and described transformer iron core TA1 integral packaging form, and these two windings common encapsulating after insulator separation is packaged into one.

Preferably, described three-phase rectifier 1 is three-phase bridge full-wave rectifier.Further, described three-phase rectifier 1 also comprises piezo-resistance RV1, piezo-resistance RV2 and the piezo-resistance RV3 between three phase poles a, b, c of the ac input end being connected in three-phase rectifier 1 respectively in parallel.

According to the residual current action breaker of another embodiment of the invention, comprise the zero sequence current mutual inductor TA of the leakage current for detecting main circuit S, three ac input ends respectively with A, B, the three-phase rectifier 1 that C three-phase firewire connects, signal processing module 2, test loop 4 and control contact apparatus 3 produce the tripping driving device 5 of trip action, the positive pole VCC of the DC output end of described three-phase rectifier 1, earth polar O respectively with the positive pole of the power input of signal processing module 2 and tripping driving device 5, earth polar connects, the two ends that two pin of the signal input part of described signal processing module 2 export winding TA2 with the secondary side of current transformer TA are respectively connected, signal processing module 2 is for comparing the size of residual current signal of each phase in sensed main circuit S and the threshold value of preferred settings, and produce trip action according to comparative result control tripping driving device 5 or maintain contact apparatus 3 in normal state of closing a floodgate.Described test loop 4 comprises the testing button be mutually connected in series, winding TA2 is exported respectively around the test winding 40 on the iron core TA1 of described instrument transformer and current-limiting resistance R with the secondary side of instrument transformer TA, the input 41 of described test loop 4 and the A phase of main circuit S being arranged in described instrument transformer inlet wire side, arbitrary phase firewire in B phase or C phase connects, described testing button is comprise the first breakpoint T1 of disjunction and the Double-breakpoint linked switch Test of the second breakpoint T2 simultaneously, the output 42 of described test loop 4 connect the N phase neutral line in the earth polar O of the DC output end of three-phase rectifier 1 or main circuit S or connect in main circuit S from input 41 connect another different phase firewire of phase firewire, so that the test winding 40 realizing test loop 4 under the first breakpoint T1 and the same nothing operation normality often opened of the second breakpoint T2 of push-button switch SB is completely isolated with the arbitrary phase firewire in main circuit S.

Further, the first breakpoint T1 of described Double-breakpoint linked switch Test is arranged on the termination of the input 41 of test loop 4, and the second described breakpoint T2 is arranged on the termination of the output 42 of test loop 4.

The test loop of existing residual current action breaker is generally direct introduces from any two-phase, can be there is a high potential over the ground and introduce electromagnetic interference in the test loop coil therefore on instrument transformer, this can strengthen the burr and spike that strengthen secondary side induction output signal.So when carrying out the residual action current testing each pole under same operating voltage, the residual action current value of each pole will there are differences, and its difference size also can change along with the technique of zero-sequence transformer.It is ground after three phase rectifier that the phase line that the present invention is disturbed existing instrument transformer introduces some reconfiguration; that is use the ground after three phase full wave rectification as the access point of the test loop coil on instrument transformer; instrument transformer is allowed to avoid extraneous disturbing factor well; to ensure the stable of three-phase residual action current value; and this test circuit can not cause cost to increase, test function and the defencive function of product can not be affected.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the electrical structure of the residual current action breaker of first embodiment of the invention.

Fig. 2 is the schematic diagram of the electrical structure of the residual current action breaker of second embodiment of the invention.

Fig. 3 is the schematic diagram of the electrical structure of the residual current action breaker of third embodiment of the invention.

Fig. 4 is the schematic diagram of the electrical structure of the residual current action breaker of fourth embodiment of the invention.

Embodiment

Below in conjunction with the embodiment that accompanying drawing 1 to 4 provides, further illustrate the embodiment of residual current action breaker of the present invention.Residual current action breaker of the present invention is not limited to the description of following examples.

Fig. 1,2 is the schematic diagram of the electrical structure of the residual current action breaker of first, second embodiment of the present invention respectively, contact apparatus 3 shown in Fig. 1,2 is three-phase and quadrupole contact apparatus, testing button all adopts single-break formula push-button switch SB, output 42 unlike the test loop 4 in Fig. 1 meets the earth polar O of the DC output end of three-phase rectifier 1, and the output 42 of the test loop 4 in Fig. 2 connects the N phase neutral line in main circuit S.Fig. 3,4 is the schematic diagram of the electrical structure of the residual current action breaker of the present invention the 3rd, the 4th embodiment respectively.Contact apparatus 3 shown in Fig. 3,4 is three-phase three pole contact apparatus, unlike, the output 42 of the test loop 4 in Fig. 3 meets the earth polar O of the DC output end of three-phase rectifier 1, and testing button adopts single-break formula push-button switch SB; And the input 41 of test loop 4 in Fig. 4 is connected with the A phase firewire in main circuit S, the B phase firewire that the output 42 of test loop 4 connects in main circuit S connects, and testing button adopts Double-breakpoint linked switch Test.Due to the winding of the test loop of existing residual current action breaker two ends still respectively with the A phase in main circuit S, a phase firewire in B phase or C phase connects, live wire now in the winding of test loop and main circuit S is not isolated, one end of the test loop winding on instrument transformer must be made like this to introduce high potential, the high voltage of this alternation makes transformer iron core TA1 produce disturbing magnetic field, the sensor current signal that this disturbing magnetic field makes secondary side main winding export produces burr and spike, add winding mode and the cause for quality of instrument transformer, when it detects smooth residual action current, the signal that the induction of instrument transformer secondary side main winding exports but is full of burr and spike, this makes the three-phase residual action current value recorded there is larger difference.And the present invention is when normal operation of circuit breaker, the testing button often opened is in open-circuit condition, the alternating current of main circuit S is not allowed to flow through test loop 4, these are different from the situation of existing residual current action breaker under testing button is in normally open, the present invention really makes test loop open a way, the test loop coil eliminated in existing residual action current circuit breaker zero-sequence transformer exports the interference produced to its main winding because introducing high voltage, the ingenious phenomenon solving the three-phase residual action current fluctuation of existing residual current action breaker, the residual action current value of any phase of product is consistent, improve accuracy and the reliability of product residue action protection function, and can effectively reduce in scheduling and planning because current value deflects away from the rework rate of scope.

See Fig. 1 to 4, residual current action breaker of the present invention comprises the zero sequence current mutual inductor TA of the leakage current for detecting main circuit S, three-phase rectifier 1, signal processing module 2, three pole or four pole contact apparatus 3, test loop 4 and tripping driving device 5, wherein: three-phase three pole contact apparatus 3 as shown in Figure 3,4, is applicable to the interchange main circuit S be made up of A phase, B phase, C phase three-phase firewire; As shown in Figure 1, 2, what be applicable to be made up of with the N phase neutral line A phase, B phase, C phase three-phase firewire exchanges main circuit S to three-phase and quadrupole contact apparatus 3.The secondary side of current transformer TA exports winding TA2 (being commonly called as main winding) around on transformer iron core TA1, in the first embodiment shown in Fig. 1,2 and the second embodiment, A phase, B phase, C phase three-phase firewire and the N phase neutral line all pass from transformer iron core TA1; In the 3rd embodiment shown in Fig. 3,4 and the 4th embodiment, A phase, B phase, C phase three-phase firewire pass from transformer iron core TA1.The circuit structure of three-phase rectifier 1 can adopt various ways, preferred employing three-phase bridge full-wave rectifier, three-phase rectifier 1 comprises 6 rectifier diode VD1, VD2, VD3, VD4, VD5 and VD6, they are by the anatomical connectivity of three-phase bridge full-wave rectifier as shown in Figures 1 to 4, three phase pole a of its ac input end, b, c respectively with the A phase in main circuit S, B phase, C phase three-phase firewire connects, the DC output end of three-phase rectifier 1 comprises positive pole VCC and earth polar O, the positive pole of the power input of signal processing module 2 and tripping driving device 5, earth polar respectively with the positive pole VCC of the DC output end of three-phase rectifier 1, earth polar O connects, three-phase rectifier 1 is by positive pole VCC, earth polar O provides DC power supply to signal processing module 2 and tripping driving device 5.The two ends that two pin of the signal input part of signal processing module 2 export winding TA2 with the secondary side of current transformer TA are respectively connected, the secondary side of instrument transformer exports winding TA2 and the residual current signal of each phase in the main circuit S sensed is exported to signal processing module 2, and signal processing module 2 is responsible for differentiating whether the size of this residual current signal reaches the threshold value of preferred settings; If residual current signal reaches threshold value, then signal processing module 2 controls tripping driving device 5 and produces trip action, and this trip action is touched contact apparatus 3 and to be tripped disjunction; If residual current signal does not reach threshold value, then signal processing module 2 should control tripping driving device 5 and is failure to actuate, and contact apparatus 3 maintains normal state of closing a floodgate.Signal processing module 2 can adopt commercially available integrated chip, signal processing module 2 generally includes residual current detection and the modulate circuit that the signal exported the secondary side main winding TA2 of instrument transformer carries out filtering and conditioning, the chip that level signal after conditioning is judged and control drive circuit, when the level signal after nursing one's health is more than or equal to setting, chip then exports a drive singal, the loop of a big current is formed when controlling conducting immediately when drive circuit receives drive singal, when there is big current, be connected on the electromagnet meeting adhesive of the tripping driving device 5 controlled in drive circuit, to make circuit breaker tripping to realize protection.Test loop 4 of the present invention comprises the testing button that can the alternating current for controlling main circuit S pass through from test loop 4, around the test winding 40 on the transformer iron core TA1 of current transformer TA and current-limiting resistance R, the secondary side that same transformer iron core TA1 is wound with instrument transformer respectively exports the test winding 40 of winding TA2 and test loop 4, testing button, test winding 40, current-limiting resistance R is connected in series the input 41 and output 42 that form test loop 4, and introduce alternating voltage by input 41 and output 42 from main circuit S, that is, the input 41 of test winding 40 should with the A phase in main circuit S, a phase firewire in B phase or C phase connects.Although the input 41 that Fig. 1 to 4 provides is connected with the A phase firewire of main circuit, do not get rid of the situation that input 41 is connected with B phase or the C phase firewire of main circuit.When testing button is in on-state; the alternating current of main circuit S is allowed to flow through test loop 4; the simulation residual current limited by current-limiting resistance R is made to flow through test winding 40 in other words; thus make transformer iron core TA1 produce magnetic field; this magnetic field makes secondary side export winding TA2 and produces sensor current signal; whether the size of this sensor current signal reaches threshold value, and causes signal processing module 2 to control tripping driving device 5 to produce trip action, normal with the protection tripping function detecting circuit breaker.

Four execution modes provided for Fig. 1 to Fig. 4 below illustrate the newly-designed test loop 4 of the present invention, according to the breakpoint pattern of testing button, the concrete structure scheme of these four execution modes can be summarized as following two large classes: single-break formula and Double-breakpoint.The first kind is the situation that testing button adopts single-break formula push-button switch SB, comprises the organization plan of the first organization plan of the three-phase four-wire system of the first embodiment shown in Fig. 1, second organization plan of three-phase four-wire system of the second embodiment shown in Fig. 2, the three-phase three-wire system of the 3rd embodiment shown in Fig. 3.Correspondingly, three kinds of circuit structure schemes of the first kind of test loop 4 can be summarized as: testing button is single-break formula push-button switch SB, it has the breakpoint T0 of 1 control test loop 4 on/off, breakpoint T0 is made up of moving contact and fixed contact, the breakpoint T0 of this push-button switch SB is arranged on the termination of the input 41 of test loop 4, namely breakpoint T0 is arranged on the termination of the test loop 4 of input 41, and the moving contact in breakpoint T0 or the pin of fixed contact are exactly the input 41 of test loop 4.The input 41 of test loop 4 is connected with the phase firewire in the A phase in main circuit S, B phase or C phase, makes test loop 4 direct power taking from the live wire of three-phase alternating current, to omit the power circuit aiming at test loop 4 and power.The output 42 of test loop 4 connects the N phase neutral line in the earth polar O of the DC output end of three-phase rectifier 1 or main circuit S, and the disjunction of the breakpoint T0 of push-button switch SB makes test loop 4 isolate with the three-phase firewire in main circuit S.The connection of output 42 comprises three kinds of concrete schemes: a kind of is the first organization plan of the three-phase four-wire system of the first embodiment shown in Fig. 1, and namely output 42 meets the earth polar O of the DC output end of three-phase rectifier 1; Another kind is the second organization plan of the three-phase four-wire system of the second embodiment shown in Fig. 2, and namely output 42 connects the N phase neutral line in main circuit S, and what utilize N to connect is ground wire, and its current potential is very low, therefore understands very little on the impact that the secondary side of instrument transformer exports; Another is the organization plan of the three-phase three-wire system of the 3rd embodiment shown in Fig. 3, and namely output 42 meets the earth polar O of the DC output end of three-phase rectifier 1.Single-break formula push-button switch SB is normal open switch; At push-button switch SB without under the normality operated, breakpoint T0 is in disjunction state, and namely moving contact and fixed contact are in open circuit isolation, and electric current can not flow through in the test loop 4 between input 41 and output 42.Although now test loop 4 not completely isolated (output 42 still keeps being connected with earth polar O or the N phase neutral line), but because the voltage to earth of earth polar O or the N phase neutral line is almost nil, so the voltage to earth of the test earth polar O of winding 40 or the N phase neutral line is also almost nil.When manual operation push-button switch SB makes moving contact and fixed contact close, electric current can flow through in the test loop 4 between input 41 and output 42, thus produces the residual current of simulation.Three kinds of organization plans of the test loop 4 of three embodiments provided as Fig. 1 to Fig. 3 of the above-mentioned first kind are all the schemes belonging to live wire isolation, its advantage be single-break formula push-button switch SB have structure simple, require lower, lower to the requirement of the electric clearance between pin, creepage distance to the withstand large voltage of push-button switch SB, high-rate performance, thus production cost can be reduced and can desirable reliability be obtained, be the scheme preferably adopted.Equations of The Second Kind is the situation that testing button adopts Double-breakpoint linked switch Test, the 4th embodiment such as shown in Fig. 4, its circuit structure is: testing button is Double-breakpoint linked switch Test, there is the breakpoint T1 that 2 control test loop 4 on/off simultaneously, T2, breakpoint T1 and breakpoint T2 comprises moving contact and fixed contact respectively, the first breakpoint T1 of this linked switch Test is arranged on the termination of the input 41 of test loop 4, this refers to that breakpoint T1 is arranged on the termination of the test loop 4 of input 41, moving contact in breakpoint T1 or the pin of fixed contact are exactly the input 41 of test loop 4.The input 41 of test loop 4 is connected with the phase firewire in the A phase in main circuit S, B phase or C phase, this refers to that input 41 is connected with A phase firewire, or input 41 is connected with B phase firewire, or input 41 is connected with C phase firewire, make test loop 4 direct power taking from the live wire of three-phase alternating current, to omit the power circuit aiming at test loop 4 and power.The termination that the second breakpoint T2 of linked switch Test is arranged on the output 42 of test loop 4 refers to that breakpoint T2 is arranged on the termination of the test loop 4 of output 42, moving contact in breakpoint T2 or the pin of fixed contact are exactly the output 42 of test loop 4, and while the first breakpoint T1 of linked switch Test and the second breakpoint T2, disjunction makes test loop 4 be completely isolated.The output 42 of test loop 4 connect in main circuit S with input 41 be connected the earth polar O of the DC output end of live wire another phase firewire out of phase or the N phase neutral line or three-phase rectifier 1, that is, the connection of the output 42 of test loop 4 comprises three kinds of concrete schemes: the first is the organization plan of the three-phase three-wire system of the 4th embodiment shown in Fig. 4, namely output 42 connect in main circuit S with input 41 be connected live wire another phase firewire out of phase, if such as input 41 is connected on A phase firewire, then output 42 is connected on B phase firewire or C phase firewire.The second is the organization plan of three-phase four-wire system, and namely output 42 connects the N phase neutral line in main circuit S.The third is the organization plan of three-phase three-wire system or three-phase four-wire system, and namely output 42 meets the earth polar O of the DC output end of three-phase rectifier 1.

Double-breakpoint linked switch Test is normal open switch, at linked switch Test without under the normality operated, first breakpoint T1 and the second breakpoint T2 is in disjunction state simultaneously, now the two ends of test loop 4 are all in open-circuit condition, namely each moving contact and respective fixed contact are in open circuit isolation, and electric current can not flow through in the test loop 4 between input 41 and output 42.When test operation, when manual operation linked switch Test makes breakpoint T1 and breakpoint T2 close simultaneously, electric current can flow through in the test loop 4 between input 41 and output 42, thus produces the residual current of simulation.As can be seen here, the organization plan of the test loop 4 of the 4th embodiment provided as Fig. 4 of Equations of The Second Kind belongs to completely isolated scheme, but because test button plays the effect disconnecting and connect AC two-phase, it must possess withstand large voltage and high-rate performance, if the electric clearance between test button pin and the equal of creepage distance can meet reliability requirement, this will be one scheme easily.In addition, the structural rate single-break switch S B of linked switch Test is more complex.

In order to prevent the electrification device such as main circuit in circuit breaker further, the electromagnetic interference of winding TA2 is exported for secondary side, another preferred scheme of the present invention is: the test winding 40 that the secondary side respectively around the instrument transformer on same transformer iron core TA1 exports winding TA2 and test loop 4 is adopted integral packaging form with transformer iron core TA1, two windings are common encapsulating encapsulation after insulator separation, instead of is again wound on the form of wire that to have shielded the instrument transformer good with encapsulating outside.Obviously, due to the competition in user's request and market, the volume of product and cost etc. are restricted, and the structure of this one encapsulating encapsulation is conducive to the miniaturization of current transformer.In addition, also by increasing, core section is long-pending correspondingly reduces the impact of the interference such as burr to increase its induction fan-out capability, and similarly, the secondary side of instrument transformer exports winding TA2 coiling symmetrically, is also more stable in order to allow instrument transformer export.

In order to improve the antisurge performance of three-phase rectifier 1 further, the voltage stabilizing circuit of the three-phase rectifier 1 of residual current action breaker of the present invention also can comprise three phase pole a that 3 are connected across the ac input end of three-phase rectifier 1 respectively, b, piezo-resistance RV1 between c, RV2 and RV3, namely piezo-resistance RV1 is connected across between the phase pole a of the ac input end of three-phase rectifier 1 with phase pole c, piezo-resistance RV2 is connected across between the phase pole b of the ac input end of three-phase rectifier 1 with phase pole c, piezo-resistance RV3 is connected across between the phase pole a of the ac input end of three-phase rectifier 1 with phase pole b.

In addition, the embodiment that the description of specification of the present invention and accompanying drawing provide only represents that current-limiting resistance R is connected in test loop 4, obviously can have the scheme of multiple equivalence to the particular location of current-limiting resistance R in test loop 4 and other equivalent structures.Such as, current-limiting resistance is serially connected between test winding 40 and the output 42 of test loop 4 as shown in the figure, also can be serially connected between testing button SB open in usual and the end of incoming cables testing winding 40, can also be serially connected between the ac input end of main circuit S and the input 41 of test loop 4.

Claims

1. a residual current action breaker, comprise the zero sequence current mutual inductor TA of the leakage current for detecting main circuit S, three ac input ends respectively with A, B, the three-phase rectifier (1) that C three-phase firewire connects, signal processing module (2), test loop (4) and control contact apparatus (3) produce the tripping driving device (5) of trip action, the positive pole VCC of the DC output end of described three-phase rectifier (1), earth polar O respectively with the positive pole of the power input of signal processing module (2) and tripping driving device (5), earth polar connects, the two ends that two pin of the signal input part of described signal processing module (2) export winding TA2 with the secondary side of zero sequence current mutual inductor TA are respectively connected, signal processing module (2) is for comparing the size of residual current signal in sensed main circuit S and the threshold value of preferred settings, and control tripping driving device (5) generation trip action according to comparative result or maintain contact apparatus (3) in normal state of closing a floodgate, it is characterized in that:

Described test loop (4) comprises the testing button SB be mutually connected in series, export winding TA2 with the secondary side of zero sequence current mutual inductor TA and be jointly wound on test winding (40) on transformer iron core TA1, and current-limiting resistance R, the input (41) of described test loop (4) and the A phase of main circuit S being arranged in described zero sequence current mutual inductor TA inlet wire side, arbitrary phase firewire in B phase or C phase connects, described testing button SB is single-break formula push-button switch SB, the output (42) of described test loop (4) meets the earth polar O of the DC output end of three-phase rectifier (1), so that under the nothing operation normality that the breakpoint T0 of single-break formula push-button switch SB often opens, realize two terminals (401 of the test winding (40) of test loop (4), 402) completely isolated with the arbitrary phase firewire in main circuit S.

2. residual current action breaker according to claim 1, it is characterized in that: the breakpoint T0 of described single-break formula push-button switch SB is arranged on the termination of the input (41) of test loop (4), the terminals (401) of arbitrary phase firewire with test winding (40) can be separated under normally open with the breakpoint T0 of bonding breakpoint formula push-button switch SB.

3. residual current action breaker according to claim 1, it is characterized in that: the secondary side of described zero sequence current mutual inductor TA exports test winding (40) employing of winding TA2 and test loop (4) and described transformer iron core TA1 integral packaging form, and these two windings common encapsulating after insulator separation is packaged into one.

4. residual current action breaker according to claim 1, it is characterized in that: described three-phase rectifier (1) is three-phase bridge full-wave rectifier, described current-limiting resistance is serially connected between test winding (40) and the output (42) of test loop (4), or be serially connected between testing button SB and the end of incoming cables testing winding (40), or be serially connected between the ac input end of main circuit S and the input (41) of test loop (4).

5. the residual current action breaker according to claim 1 or 4, is characterized in that: described three-phase rectifier (1) also comprises the first piezo-resistance RV1, the second piezo-resistance RV2 between three phase poles a, b, c and the 3rd piezo-resistance RV3 of the ac input end being connected in three-phase rectifier (1) respectively in parallel.

6. a residual current action breaker, comprise the zero sequence current mutual inductor TA of the leakage current for detecting main circuit S, three ac input ends respectively with A, B, the three-phase rectifier (1) that C three-phase firewire connects, signal processing module (2), test loop (4) and control contact apparatus (3) produce the tripping driving device (5) of trip action, the positive pole VCC of the DC output end of described three-phase rectifier (1), earth polar O respectively with the positive pole of the power input of signal processing module (2) and tripping driving device (5), earth polar connects, the two ends that two pin of the signal input part of described signal processing module (2) export winding TA2 with the secondary side of zero sequence current mutual inductor TA are respectively connected, signal processing module (2) is for comparing the size of residual current signal in sensed main circuit S and the threshold value of preferred settings, and control tripping driving device (5) generation trip action according to comparative result or maintain contact apparatus (3) in normal state of closing a floodgate, it is characterized in that:

Described test loop (4) comprises the testing button SB be mutually connected in series, export winding TA2 with the secondary side of zero sequence current mutual inductor TA and be jointly wound on test winding (40) on transformer iron core TA1, and current-limiting resistance R, the input (41) of described test loop (4) and the A phase of main circuit S being arranged in described zero sequence current mutual inductor TA inlet wire side, arbitrary phase firewire in B phase or C phase connects, described testing button SB comprises the first breakpoint T1 of disjunction and the Double-breakpoint linked switch Test of the second breakpoint T2 simultaneously, the output (42) of described test loop (4) connect in main circuit S from input (41) connect another different phase firewire of phase firewire, the first breakpoint T1 of described Double-breakpoint linked switch Test is arranged on the termination of the input (41) of test loop (4), the second described breakpoint T2 is arranged on the termination of the output (42) of test loop (4), so that under the first breakpoint T1 and the same nothing operation normality often opened of the second breakpoint T2 of Double-breakpoint linked switch Test, the test winding (40) realizing test loop (4) is completely isolated with the arbitrary phase firewire in main circuit S.

7. residual current action breaker according to claim 6, it is characterized in that: the secondary side of described zero sequence current mutual inductor TA exports test winding (40) employing of winding TA2 and test loop (4) and described transformer iron core TA1 integral packaging form, and these two windings common encapsulating after insulator separation is packaged into one.

8. residual current action breaker according to claim 6, it is characterized in that: described three-phase rectifier (1) is three-phase bridge full-wave rectifier, described current-limiting resistance is serially connected between test winding (40) and the output (42) of test loop (4), or be serially connected between testing button SB and the end of incoming cables testing winding (40), or be serially connected between the ac input end of main circuit S and the input (41) of test loop (4).

9. the residual current action breaker according to claim 6 or 8, is characterized in that: described three-phase rectifier (1) also comprises the first piezo-resistance RV1, the second piezo-resistance RV2 between three phase poles a, b, c and the 3rd piezo-resistance RV3 of the ac input end being connected in three-phase rectifier (1) respectively in parallel.