CN100539345C - Dead-space free circuit breaker for earth leakage abrupt change and operation method thereof - Google Patents
Dead-space free circuit breaker for earth leakage abrupt change and operation method thereof Download PDFInfo
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- CN100539345C CN100539345C CNB2004100726236A CN200410072623A CN100539345C CN 100539345 C CN100539345 C CN 100539345C CN B2004100726236 A CNB2004100726236 A CN B2004100726236A CN 200410072623 A CN200410072623 A CN 200410072623A CN 100539345 C CN100539345 C CN 100539345C
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Abstract
The present invention relates to a kind of dead-space free circuit breaker for earth leakage abrupt change and operation method thereof, comprise single-chip microcomputer, zero sequence current mutual inductor, electric leakage signal amplifying circuit, power supply, leakage tripping device and air circuit, wherein the operation sequence of single-chip microcomputer is: (1) initialization, (2) amplitude and the phase angle of survey residual current, (3) judge that whether residual current is greater than operating value, greater than the time send the electric leakage instruction of threading off, (4) calculate the sudden change leakage current value, (5) whether judge the sudden change leakage current value greater than operating value, greater than the time send the electric leakage instruction of threading off.This instruction makes the leakage tripping device action, drives air circuit disengagement failure circuit, and obtaining earth leakage abrupt change does not have the dead band protection.The present invention also can add the electric leakage simulation circuit and/or the auxiliary part of leakage current display circuit take place, can also carry out three phase decompositions to leakage current, and demonstrate each phase leakage current respectively by charactron, and made things convenient for analysis and judgement to each situation of leaking electricity mutually, find out maximum electric leakage phase line.
Description
Technical field
Technical scheme of the present invention relates to a kind of automatic disconnection emergency protective circuit device that the undesirable variation that departs from the normal electrical working condition is directly reacted, specifically a kind of dead-space free circuit breaker for earth leakage abrupt change and operation method thereof.
Background technology
Electric leakage protection technology is a kind of prevent from the to leak electricity fire and the personal technology of getting an electric shock of protection of extensive use in low voltage electric network.The electric leakage protection technology that adopts in residual current circuit breaker at present is the aftercurrent action protecting technology.In three phase network; because there is phase angle difference in each phase leakage current; the phase place of the final residual current that synthesizes is an arbitrary value; as equipment electric leakage or when having the people to get an electric shock, the phase place of intrinsic residual current is possible opposite in this electric leakage or shock current and the electrical network, causes residual current not only not increase; reduce on the contrary; this moment, earth leakage protective device should move and akinesia, the earth leakage protective dead band occurred, to such an extent as to cause leakage current loss and electric shock casualty accident.
At CN 85205360 " phase depending on rectification formula Pulse Electric flow pattern protector "; CN 95217004.3 " phase demodulation amplitude discrimination silent running earth leakage protective device "; CN 96250129.8 " phase demodulation amplitude discrimination impulse type earth leakage protective device "; CN 99251608.0 " phase demodulation amplitude discrimination electric shock electric leakage actuating relay "; CN 01228575.7 " have gradual with the sudden change two adjusting devices earth leakage protective devices " and CN 02280316.5 " phase-detecting amplitude-detecting leak comprehensive protector " in; disclosed and solved electric leakage and the difference guard method of getting an electric shock; at CN 98118285.2; the technology that has adopted microcomputer to carry out the phase-detecting amplitude-detecting leak protection is disclosed among CN 98245498.8 " microcomputerized digital intelligent leakage protector " and the CN 98217990.1 " microcomputer phase-detecting amplitude-detecting leak protector "; solved because discrete component is influenced by temperature etc. and caused that parameter changes the problem that causes the electric shock operating dead zone, but only to occurring in phase line or protecting with the electric shock that phase line does not have on the phase difference.In a word, above-mentioned disclosed technology still can not effectively be protected for equipment electric leakage, the capacitive of people's contact electrification or the electric shock situation of perceptual equipment, i.e. still there is the dead band in equipment earth leakage protective and people's electrical shock protection.
Summary of the invention
Technical problem to be solved by this invention is: a kind of dead-space free circuit breaker for earth leakage abrupt change is provided; no matter in the electrical network whether leakage current is arranged; as long as the leakage current that access device leaks electricity or have the people to get an electric shock causes reaches the electric leakage operating value; circuit breaker is all made the protection action; realize thus equipment electric leakage, people are got an electric shock and effectively protect, overcome simultaneously in the phase-detecting amplitude-detecting leak protector only to occurring in phase line or not having the shortcoming that the electric shock on the phase difference is protected with phase line.
The present invention solves this technical problem the technical scheme that is adopted: dead-space free circuit breaker for earth leakage abrupt change of the present invention, comprise single-chip microcomputer, zero sequence current mutual inductor, electric leakage signal amplifying circuit, power supply, leakage tripping device and air circuit part, zero sequence current mutual inductor connects the electric leakage signal amplifying circuit, the electric leakage signal amplifying circuit connects single-chip microcomputer, single-chip microcomputer connects leakage tripping device, leakage tripping device connects air circuit, single-chip microcomputer connects power supply, power supply connects 220 volts of alternating voltages, and wherein single-chip microcomputer has following operation sequence:
The first step, after powering on, general register and special register are carried out initialization, initialization comprising the register of timer and A/D conversion, sample frequency and sampling window cycle are set, sample frequency is much larger than the frequency of residual current signal, and the sampling window cycle is the cycle of residual current signal, changes for second step after initialization is finished;
Second step, according to sample frequency and window period the residual current signal is gathered, finish the sampling of one-period after, calculate the amplitude and the phase angle of residual current, changeed for the 3rd step;
The 3rd step, whether judge residual current greater than operating value, when residual current during, sending the electric leakage instruction of threading off more than or equal to operating value, make the leakage tripping device action, drive air circuit disengagement failure circuit when residual current during less than operating value, changeed for the 4th step;
The 4th step according to the amplitude and the phase angle of the residual current of firm detection, compared with the amplitude and the phase angle of the residual current of former detection, calculated electric leakage mutation current value by the trigonometric function formula, changeed next step;
In the 5th step, whether judge electric leakage mutation current value greater than operating value, when electric leakage mutation current value during less than operating value, changeed for second step,, sending the electric leakage instruction of threading off when electric leakage mutation current value during more than or equal to operating value, make the leakage tripping device action, drive air circuit disengagement failure circuit.
Dead-space free circuit breaker for earth leakage abrupt change of the present invention also can add following auxiliary part: circuit and/or leakage current display circuit take place in the electric leakage simulation.
Dead-space free circuit breaker for earth leakage abrupt change of the present invention realizes that earth leakage abrupt change does not have the dead band and protects the operation method of process to be: zero sequence current mutual inductor is that voltage signal is input to the electric leakage signal amplifying circuit with the residual current signal transformation in the detected electrical network; Signal after the electric leakage signal amplifying circuit amplifies is directly inputted in the single-chip microcomputer; Single-chip microcomputer is to residual current, be three-phase leakage current vector and, carry out following processing: single-chip microcomputer constantly detects the amplitude and the phase angle of residual current, and the variation of analysis amplitude and phase angle, residual current and this preceding constantly residual current of current time are compared, according to their amplitude and phase angle difference, calculate this new constantly leakage current that produces by the trigonometric function formula, single-chip microcomputer judges whether the residual current of current time and this new constantly leakage current that produces reach the electric leakage operating value, residual current and/or this new constantly leakage current that produces when current time, mutation current promptly leaks electricity, when meeting or exceeding the electric leakage operating value, single-chip microcomputer sends electric leakage dropout order, makes the leakage tripping device action, drive air circuit disengagement failure circuit, make leak current fault obtain the protection that earth leakage abrupt change does not have the dead band; Power supply is single-chip microcomputer and other circuit supply.
Single-chip microcomputer detects residual current and electric leakage mutation current, can also be according to their amplitude and phase angle, decompose on mutually at A phase, B phase, C, and calculate the current value of going up mutually at each.
Auxiliary part in the dead-space free circuit breaker for earth leakage abrupt change of the present invention realizes that earth leakage abrupt change does not have the dead band and protects the operation method of the booster action of process to be: single-chip microcomputer is delivered to the demonstration that the leakage current display circuit carries out leakage current with leakage current, the leakage current display circuit is electric leakage mutation current value or the residual electricity flow valuve during display action also, and electric leakage manner of execution, leakage current shows that flicker is the earth leakage abrupt change mode soon, and leakage current shows that flicker is the residual current acting mode slowly; Electric leakage simulation generation breadboardin produces the fault electric leakage, when single-chip microcomputer detects the simulated failure electric leakage, also sends electric leakage dropout order, is used to check whether circuit breaker of the present invention is normal.
The leakage current display circuit also demonstrates each current value of going up mutually.
Air circuit of the present invention contains pyromagnetic detecting element, can realize the protection of overload, short circuit, earth fault by pyromagnetic detecting element.
Beneficial effect of the present invention, advantage compared with prior art of the present invention is as follows:
(1) dead-space free circuit breaker for earth leakage abrupt change of the present invention had both detected the amplitude of residual current; also detected the phase angle of residual current; the indirect detection mutation current value that goes out to leak electricity simultaneously; and existing residual current circuit breaker is only protected according to the residual current amplitude of current time; even phase demodulation amplitude discrimination type earth leakage protective device is also only to detecting with the synchronous jump signal of power supply phase line, correct protection that can't realization equipment sudden change electric leakage.
(2) dead-space free circuit breaker for earth leakage abrupt change of the present invention carries out three phase decompositions to leakage current, and demonstrates each phase leakage current respectively by charactron, has made things convenient for analysis and the judgement of people to each situation of leaking electricity mutually, can find out maximum electric leakage phase line.
(3) the present invention has realized the indication of electric leakage manner of execution by charactron, leakage current value in the time of not only can showing the electric leakage action, also the flicker speed that shows with leakage current indicates earth leakage abrupt change mode and residual current acting mode, is convenient to people's accident analysis of leaking electricity.
(4) the present invention's sudden change protective circuit of will leaking electricity is installed in the circuit breaker, realizes the protection of overload, short circuit, earth fault by the pyromagnetic detecting element of circuit breaker, has saved installing space.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the connection block diagram between each part of the present invention.
Fig. 2 is the connection block diagram that is added with between each part of the present invention of auxiliary circuit.
Fig. 3 is residual current that detects among the present invention and the graph of a relation that leaks electricity the mutation current value.
Fig. 4 is circuit catenation principle figure of the present invention.
Fig. 5 is the flow chart in the no dead band of chip microcontroller electric leakage sudden change among the present invention.
Among the figure, 1. air circuit, 2. single-chip microcomputer, 3. zero sequence current mutual inductor, 4. the electric leakage signal amplifying circuit, 5. leakage tripping device, 6. circuit, 7. leakage current display circuit, 8. power supply take place in electric leakage simulation.
Embodiment
Embodiment
Fig. 1 shows, dead-space free circuit breaker for earth leakage abrupt change of the present invention comprises air circuit 1, single-chip microcomputer 2, zero sequence current mutual inductor 3, electric leakage signal amplifying circuit 4, leakage tripping device 5 and power supply 8 parts, zero sequence current mutual inductor 3 connects electric leakage signal amplifying circuit 4, electric leakage signal amplifying circuit 4 connects single-chip microcomputer 2, single-chip microcomputer 2 connects leakage tripping device 5, leakage tripping device 5 connects air circuit 1, single-chip microcomputer 2 connects power supply 8, power supply 8 connects 220 volts of alternating voltages, and they realize that earth leakage abrupt change does not have the dead band and protects the operation method of process to be: zero sequence current mutual inductor 3 is that voltage signal is input to electric leakage signal amplifying circuit 4 with the residual current signal transformation in the detected electrical network; Signal after electric leakage signal amplifying circuit 4 amplifies is directly inputted in the single-chip microcomputer 2; 2 pairs of residual currents of single-chip microcomputer, be three-phase leakage current vector and, carry out following processing: single-chip microcomputer 2 constantly detects the amplitude and the phase angle of residual current, and the variation of analysis amplitude and phase angle, residual current and this preceding constantly residual current of current time are compared, according to their amplitude and phase angle difference, calculate this new constantly leakage current that produces by the trigonometric function formula, single-chip microcomputer 2 judges whether the residual current of current time and this new constantly leakage current that produces reach the electric leakage operating value, residual current and/or this new constantly leakage current that produces when current time, mutation current promptly leaks electricity, when meeting or exceeding the electric leakage operating value, single-chip microcomputer 2 sends electric leakage dropout order, makes leakage tripping device 5 actions, drive air circuit 1 disengagement failure circuit, leak current fault is protected; Power supply 8 is single-chip microcomputer 2 and other circuit supply.
Fig. 2 shows that the dead-space free circuit breaker for earth leakage abrupt change of the present invention that is added with auxiliary circuit comprises that circuit 6, leakage current display circuit 7 and power supply 8 take place for air circuit 1, single-chip microcomputer 2, zero sequence current mutual inductor 3, electric leakage signal amplifying circuit 4, leakage tripping device 5, electric leakage simulation.Wherein, single-chip microcomputer 2, zero sequence current mutual inductor 3, electric leakage signal amplifying circuit 4, electric leakage simulation generation circuit 6, leakage current display circuit 7, power supply 8 do not have the dead zone unit network component for earth leakage abrupt change, their realize that the operation method that earth leakage abrupt change does not have dead band protection process and a booster action is: the residual current in zero sequence current mutual inductor 3 detection of grid, and be that voltage signal is input to electric leakage signal amplifying circuit 4 with residual current signal transformation; Signal after electric leakage signal amplifying circuit 4 amplifies is directly inputted in the single- chip microcomputer 2,2 pairs of residual currents of single-chip microcomputer, be three-phase leakage current vector and, carry out following processing: single-chip microcomputer 2 constantly detects the amplitude and the phase angle of residual current, and the variation of analysis amplitude and phase angle, residual current and this preceding constantly residual current of current time are compared, according to their amplitude and phase angle difference, calculate this new constantly leakage current that produces by the trigonometric function formula, single-chip microcomputer 2 judges whether the residual current of current time and this new constantly leakage current that produces reach the electric leakage operating value, residual current and/or this new constantly leakage current that produces when current time, mutation current promptly leaks electricity, when meeting or exceeding the electric leakage operating value, single-chip microcomputer 2 sends electric leakage dropout order, and promptly single-chip microcomputer 2 output high level trigger bidirectional triode thyristor SCR1 and make leakage tripping device 5 actions, drive air circuit 1 disengagement failure circuit, leak current fault is protected; Single-chip microcomputer 2 is delivered to leakage current display circuit 7 with leakage current and is carried out the demonstration of leakage current, electric leakage mutation current value when leakage current display circuit 7 is gone back display action or residual electricity flow valuve, and electric leakage manner of execution; Power supply 8 is single-chip microcomputer 2 and other circuit supply, and 6 simulations of electric leakage simulation generation circuit produce the fault electric leakage, when single-chip microcomputer detects the simulated failure electric leakage, also send the order of threading off of leaking electricity, and are used to check whether circuit breaker of the present invention is normal.
In Fig. 3, I
1Be the original residual current that just has in the electrical network, I
2For when equipment electric leakage or people get an electric shock, the electric leakage mutation current of generation, I
0Residual current for current time.Fig. 2 shows, if I
2More than or equal to the residual operating current value, residual current circuit breaker should be moved, and electric leakage of protection equipment or people get an electric shock.Yet, because present existing residual current circuit breaker can't detect electric leakage mutation current I
2, can only detect the residual current I of current time
0At I
2Greater than I
1, and both phase angle differences are under the situation between 120 ° to 240 °, I
0Less than I
2Work as I
2More than or equal to residual operating current, and I
0When not reaching residual operating current, present existing residual current circuit breaker can not moved, and promptly has the earth leakage protective dead band in the case, may bring about great losses.The present invention can realize electric leakage mutation current I
2Residual current I with current time
0Detection.Single-chip microcomputer 2 in the dead-space free circuit breaker for earth leakage abrupt change of the present invention detects electric leakage mutation current I
2Residual current I with current time
0Program be: the sampling of the residual current of 2 pairs of inputs of single-chip microcomputer, sample frequency is much larger than the frequency of residual current signal, adopt 40 sampling frequencies in the present embodiment, note residual current waveform, and calculate its effective value, simultaneously the time of zero crossing is carried out record, go out the phase angle of residual current according to the residual current computation of Period, the amplitude of residual current and the detection of phase angle have promptly been finished, note the amplitude and the phase angle of residual current simultaneously, single-chip microcomputer 2 is according to the information of noting residual current, with the current residual electric current I
0Compare, calculate the sudden change value I of leakage current by the trigonometric function formula
2By above method, single-chip microcomputer 2 has been realized residual current I
1And I
0Amplitude and the direct detection of phase angle, and according to the trigonometric function computing formula to electric leakage mutation current I
2Calculating, realized indirect measurement to the electric leakage mutation current, single-chip microcomputer 2 also decomposes at A phase, B phase, C residual electricity flow valuve, electric leakage mutation current value on mutually, calculates the electric leakage of going up mutually at each, and can show by leakage current display circuit 7.As residual current I
0Or electric leakage mutation current I
2When reaching operating value, single-chip microcomputer 2 sends the earth leakage protective instruction, i.e. single-chip microcomputer 2 output high level; trigger bidirectional triode thyristor SCR1 by R2; make leakage tripping device 5 drive air circuit 1 and thread off, carry out earth leakage protective, realized that earth leakage abrupt change of the present invention does not have the dead band.
As shown in Figure 4, zero sequence current mutual inductor LH 3 has two secondary, and one of them secondary is connected to electric leakage signal amplifying circuit 4, and another secondary and button SW1 and resistance R 1 constitute the electric leakage simulation circuit 6 takes place.
As shown in Figure 4; single-chip microcomputer U1 2 accepts the residual current signal after electric leakage signal amplifying circuit 4 amplifies; the RB1 of single-chip microcomputer U1 2-RB7 output electric leakage information data; residual current when control leakage current display circuit 7 shows operate as normal; electric leakage manner of execution during the protection action; promptly indicate earth leakage abrupt change mode and residual current acting mode, single-chip microcomputer U1 2 realizes the earth leakage protective action by leakage tripping device 5 control air circuits 1.
As shown in Figure 4, electric leakage signal amplifying circuit 4 is made of R3, C5, U2A, R4, R5, R6, R7, R8, the output of zero sequence current mutual inductor LH 3 meets R3, C5, with residual current signal transformation is voltage signal, the amplifying circuit that constitutes via U2A, R4, R5, R6, R7 amplifies signal, inputs to single-chip microcomputer U1 2 through R8.
As shown in Figure 4, leakage tripping device TR15 is used to drive air circuit 1 dropout; Air circuit 1 is subjected to the control of single-chip microcomputer U1 2 by leakage tripping device 5.
As shown in Figure 4, another secondary of zero sequence current mutual inductor LH 3 and button SW1 and resistance R 1 constitute electric leakage simulation generation circuit 6.When pressing SW1; zero sequence current mutual inductor will produce the electric leakage signal of a simulation; after single-chip microcomputer U1 2 detects this signal; to send action command; trigger bidirectional triode thyristor SCR1 by R2; make leakage tripping device TR15 drive air circuit 1 and thread off, be used to check whether the earth leakage protective performance of circuit breaker is normal.
As shown in Figure 4, resistance R 9, R10, R11, R12, R13, R14, R15, charactron LDE1, triode T2, T3 and T4 have constituted leakage current display circuit 7.This circuit is under the control of single-chip microcomputer U1 2; adopt the scanning display mode; make triode T2, T3, the T4 conducting that circulates successively; select the charactron conducting of corresponding positions respectively; charactron is wanted the RB1-RB7 output of data presented by single-chip microcomputer U1 2 simultaneously; light charactron, thereby realized the demonstration of single-chip microcomputer U1 2 output informations, electric leakage mutation current value when the residual electricity flow valuve when these information comprise circuit breaker work, earth leakage protective action or residual electricity flow valuve and electric leakage manner of execution.Single-chip microcomputer 2 also decomposes at A phase, B phase, C residual electricity flow valuve, electric leakage mutation current value on mutually, calculate at each residual current of going up mutually and electric leakage mutation current, can deliver to leakage current display circuit 7 to these current values, the charactron by leakage current display circuit 7 shows respectively.
As shown in Figure 4, power supply 8 is made of transformer B1, diode D1, D2, integrated voltage stabilizing T1, capacitor C 1, C2, C3, C4, and transformer B1 output meets diode D1, D2 and integrated voltage stabilizing T1, and C1, C2, C3, C4 carry out filtering to power supply.
Fig. 5 shows the program in the no dead band of chip microcontroller electric leakage sudden change among the present invention:
The first step, after powering on, general register and special register are carried out initialization, initialization comprising the register of timer and A/D conversion, sample frequency and sampling window cycle are set, sample frequency is much larger than the frequency of residual current signal, and the sampling window cycle is the cycle of residual current signal, changes for second step after initialization is finished;
Second step, according to sample frequency and window period the residual current signal is gathered, finish the sampling of one-period after, calculate the amplitude and the phase angle of residual current, changeed for the 3rd step;
The 3rd step, whether judge residual current greater than operating value, when residual current during, sending electric leakage and threading off and instruct more than or equal to operating value, when residual current during, changeed for the 4th step less than operating value;
The 4th step according to the amplitude and the phase angle of the residual current of firm detection, compared with the amplitude and the phase angle of the residual current of former detection, calculated electric leakage mutation current value by the trigonometric function formula, changeed next step;
The 5th step, whether judge electric leakage mutation current value greater than operating value, when electric leakage mutation current value during, changeed for second step less than operating value, when electric leakage mutation current value during, sending the electric leakage instruction of threading off more than or equal to operating value.
Claims (3)
1. dead-space free circuit breaker for earth leakage abrupt change, it is characterized in that: comprise single-chip microcomputer, zero sequence current mutual inductor, electric leakage signal amplifying circuit, power supply, leakage tripping device and air circuit part, zero sequence current mutual inductor connects the electric leakage signal amplifying circuit, the electric leakage signal amplifying circuit connects single-chip microcomputer, single-chip microcomputer connects leakage tripping device, and leakage tripping device connects air circuit, and single-chip microcomputer connects power supply, power supply connects 220 volts of alternating voltages, and wherein single-chip microcomputer has following operation sequence:
The first step, after powering on, general register and special register are carried out initialization, initialization comprising the register of timer and A/D conversion, sample frequency and sampling window cycle are set, sample frequency is much larger than the frequency of residual current signal, and the sampling window cycle is the cycle of residual current signal, changes for second step after initialization is finished;
Second step, according to sample frequency and window period the residual current signal is gathered, finish the sampling of one-period after, calculate the amplitude and the phase angle of residual current, changeed for the 3rd step;
The 3rd step, whether judge residual current greater than operating value, when residual current during, sending the electric leakage instruction of threading off more than or equal to operating value, make the leakage tripping device action, drive air circuit disengagement failure circuit when residual current during less than operating value, changeed for the 4th step;
The 4th step according to the amplitude and the phase angle of the residual current of firm detection, compared with the amplitude and the phase angle of the residual current of former detection, calculated electric leakage mutation current value by the trigonometric function formula, changeed next step;
In the 5th step, whether judge electric leakage mutation current value greater than operating value, when electric leakage mutation current value during less than operating value, changeed for second step,, sending the electric leakage instruction of threading off when electric leakage mutation current value during more than or equal to operating value, make the leakage tripping device action, drive air circuit disengagement failure circuit;
In the aforesaid operations program, the program that single-chip microcomputer detects the residual current of electric leakage mutation current and current time is: single-chip microcomputer is to the residual current sampling of input, adopt 40 sampling frequencies, note residual current waveform, and calculate its effective value, simultaneously the time of zero crossing is carried out record, go out the phase angle of residual current according to the residual current computation of Period, the amplitude of residual current and the detection of phase angle have promptly been finished, note the amplitude and the phase angle of residual current simultaneously, single-chip microcomputer compares with the current residual electric current according to the information of noting residual current, calculates electric leakage mutation current value by the trigonometric function formula.
2. dead-space free circuit breaker for earth leakage abrupt change according to claim 1, it is characterized in that: be added with the electric leakage simulation circuit and/or the auxiliary part of leakage current display circuit take place, this part realizes that earth leakage abrupt change does not have the dead band and protects the operation method of the booster action of process to be: single-chip microcomputer is delivered to the demonstration that the leakage current display circuit carries out leakage current with leakage current, the leakage current display circuit is electric leakage mutation current value or the residual electricity flow valuve during display action also, and electric leakage manner of execution, leakage current shows that flicker is the earth leakage abrupt change mode soon, and leakage current shows that flicker is the residual current acting mode slowly; Electric leakage simulation generation breadboardin produces the fault electric leakage, when single-chip microcomputer detects the simulated failure electric leakage, also sends electric leakage dropout order.
3. dead-space free circuit breaker for earth leakage abrupt change according to claim 2; it is characterized in that: realize that at auxiliary part earth leakage abrupt change does not have in the operation method of booster action of dead band protection process, the leakage current display circuit demonstrates each current value of going up mutually.
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| CNB2004100726236A CN100539345C (en) | 2004-11-04 | 2004-11-04 | Dead-space free circuit breaker for earth leakage abrupt change and operation method thereof |
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| CNB2004100726236A CN100539345C (en) | 2004-11-04 | 2004-11-04 | Dead-space free circuit breaker for earth leakage abrupt change and operation method thereof |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20090257156A1 (en) * | 2008-04-15 | 2009-10-15 | General Electric Company | Method of setting a ground fault trip function for a trip unit and a trip unit having a defined trip function for ground fault protection |
| CN102593802B (en) * | 2012-03-07 | 2014-09-24 | 淄博开发区东方电力器材厂 | Three-phase variable leakage current protective device |
| CN102684141B (en) * | 2012-04-28 | 2015-05-20 | 中国农业大学 | Shock current identifying method and aftercurrent protecting device |
| CN102904209A (en) * | 2012-11-01 | 2013-01-30 | 四川省电力公司资阳公司 | Digital signal processing (DSP)-based current separation motion type electric leakage protection device and method |
| CN103078291B (en) * | 2012-12-27 | 2015-07-01 | 江苏创能电器有限公司 | Intelligent residual current leakage sudden-change protection method |
| CN104597353A (en) * | 2015-01-23 | 2015-05-06 | 深圳供电局有限公司 | Three-remote-point zero sequence protection state detecting apparatus and method |
| CN106602509B (en) * | 2016-12-21 | 2018-11-27 | 国家电网公司 | A kind of earth leakage protective method, system and Aftercurrent protection circuit breaker |
| CN113865107A (en) * | 2020-06-30 | 2021-12-31 | 芜湖美的厨卫电器制造有限公司 | Power consumption environment detection device and water heater |
| CN114624576A (en) * | 2020-12-10 | 2022-06-14 | 施耐德电气（中国）有限公司 | Fault diagnosis apparatus and method for electrical system |
| CN113595043A (en) * | 2021-07-29 | 2021-11-02 | 广东电网有限责任公司 | Method and device for judging leakage protection starting and delay action of power grid |
| CN114966466B (en) * | 2022-04-29 | 2024-06-21 | 河北工业大学 | Electromagnetic leakage detection circuit parameter design method and device |
| CN116845822B (en) * | 2023-07-11 | 2024-01-26 | 北京达三江电器设备厂 | Anti-interference intelligent residual current action protector system |
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