CN203377585U - Residual current protection circuit - Google Patents
Residual current protection circuit Download PDFInfo
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- CN203377585U CN203377585U CN201320527809.0U CN201320527809U CN203377585U CN 203377585 U CN203377585 U CN 203377585U CN 201320527809 U CN201320527809 U CN 201320527809U CN 203377585 U CN203377585 U CN 203377585U
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Abstract
The utility model relates to a residual current protection circuit. The residual current protection circuit comprises a surge absorption circuit, a three-phase rectifier circuit, a tripping device, a thyristor drive circuit, a step-down voltage regulator circuit, a test circuit, a zero sequence current transformer, a current setting and signal amplification circuit, a threshold comparison circuit, and a delay setting circuit; wherein the current setting and signal amplification circuit is connected with the secondary side of the zero sequence current transformer, the current setting and signal amplification circuit, the threshold comparison circuit and the delay setting circuit are sequentially connected, and the signal output end of the delay setting circuit is connected with the thyristor drive circuit. The circuit breaks the normal procedures and makes full use of conventional electronic devices to build a new earth leakage protection platform. The protection circuit uses an analog circuit as the main design, the stability and reliability of the protection circuit are superior to that of the protection circuit using the special chip as the main design, and moreover the cost of the residual current protection circuit is lower and the performance is superior.
Description
Technical field
The utility model designs a kind of protective circuit, and specifically a kind of residual current protection circuit, belong to the low voltage circuit protection technical field.
Background technology
A kind of residual current protection circuit is a kind of effective safeguard procedures that prevent that personal electric shock, electrical fire and electric equipment from damaging; the residual current operated protective device of China is to start development from the mid-1970s; and at first in rural low voltage network, apply; through the eighties to the nineties constantly improve and development to have formed a kind perfect, complete in specifications, meet the product line of the residual current operated protective device of IEC international standard.In the safeguard protection of low voltage electric network, especially in the safeguard protection of rural low voltage network, brought into play important effect.
Residual current protection circuit can be divided into electromagnetic residual current protective circuit and electronic type residual current protection circuit according to manner of execution, and wherein the electronic type residual current protection circuit is according to being divided into GENERAL TYPE electronic type residual current protection circuit and time lagged type electronic type residual current protection circuit its operate time.Time lagged type electronic type residual current protection circuit custom-designed to a certain residual action current value can reach a preestablished limit be failure to actuate the time residual current operated protective device.Time-delay residual current operated protective device, mainly as the protective device of backbone or branch line, can coordinate with the protective device of terminated line, reaches the requirement of selective protection.
Usually adopt in real world applications and take M54123, M54133 and M54134 or single-chip microcomputer as main circuit form; take China Patent No. CN202260390U as example; it discloses the time-delay residual current operated protective device that a kind of reliability is high; comprise shell, end of incoming cables, leading-out terminal, air switch; also have input protection circuit, electric-leakage detection circuit, dropout control circuit; protective circuit is connected with electric-leakage detection circuit through power circuit, and electric-leakage detection circuit is connected with the dropout control circuit through dropout Time delay circuit.Said power circuit is comprised of fuse (F1-F3), rectifier diode (D1-D13), current-limiting resistance (R1, R7), electric capacity (C2, C3, C10) and voltage-stabiliser tube (VZ1).Said dropout Time delay circuit is comprised of diode (D15-D16), resistance (R4, R5) and integrated circuit (IC2).But high the going wrong of this integrated circuit (IC) chip integrated level is difficult to search, and need to all replace, and operating temperature range is narrow, affects the product scope of application.
The utility model content
Technical problem to be solved in the utility model is to be different from prior art in domestic low voltage electrical apparatus industry leakage current detection protection circuit generally to adopt that to take special chip M54123, M54133 and M54134 be main circuit form; thereby provide a kind of and build new earth leakage protective platform with conventional electronic device; this protective circuit be take analog circuit as main design; surpass on the Stability and dependability of circuit and take special chip as main protective circuit; and cost is lower, more superior on performance.
For solving the problems of the technologies described above, the utility model is achieved through the following technical solutions:
A kind of residual current protection circuit comprises:
Surge absorbing circuit, input connects respectively three phase lines;
Rectified three-phase circuit, its input is connected with described surge absorbing circuit output, and its output is connected with release;
Release, be connected with decompression voltage regulator successively with controllable silicon drive circuit, described decompression voltage regulator output services voltage;
Zero sequence current mutual inductor, be arranged on three phase mains;
Also comprise current settings and signal amplification circuit, threshold value comparison circuit, delay setting circuit; Described current settings is connected with the zero sequence current mutual inductor secondary side with signal amplification circuit, described current settings is connected successively with signal amplification circuit, threshold value comparison circuit, delay setting circuit, the input of described threshold value comparison circuit and delay setting circuit also is connected with described decompression voltage regulator output respectively, and the signal output part of described delay setting circuit connects described controllable silicon drive circuit.
Described delay setting circuit is provided with slide switch, and selects three different resistance by described slide switch, makes the electric capacity of series connection with it can select different discharge times, to reach the controlled purpose of time delay.
Described electric capacity is tantalum electric capacity.
Diode D10 in described current settings and signal amplification circuit, resistance R 18, be connected to the secondary side of described zero sequence current mutual inductor after capacitor C 5 parallel connections, described secondary side one end ground connection, the positive input of operational amplifier U1B is by the resistance R 24 of connecting successively, capacitor C 7, resistance R 20 is connected to the secondary side of described zero sequence current mutual inductor, the intermediate point ground connection of capacitor C 7 and resistance R 24, the reverse input end of described operational amplifier U1B is connected between resistance 20 and capacitor C 7 by resistance R 17, the output of described operational amplifier U1B connects the anode of diode D11, the negative electrode of diode D11 forms the output of described current settings and signal amplification circuit, the resistance R 15 of series connection, R16 and capacitor C 4 are connected in parallel on reverse input end and the output two ends of described operational amplifier U1B, the positive input of operational amplifier U1C is connected between resistance R 17 and resistance R 20 by resistance R 32, the output of operational amplifier U1C is connected to the anode of diode D11, the output of operational amplifier U1C also is connected on its reverse input end by resistance R in parallel 39 and capacitor C 12, resistance R 35, R40, R41 parallel connection and an end are connected with the end of slide switch S1 respectively, the other end reverse input end of putting ground connection and being connected to described operational amplifier U1C by resistance R 36 in parallel, the described slide switch S1 other end is connected to the secondary side of described zero sequence current mutual inductor.
The input that in described threshold value comparison circuit, resistance R 30 1 ends are described threshold value comparison circuit, described resistance R 30 other ends are connected with the reverse input end of operational amplifier U1D, after resistance R 37 is in parallel with capacitor C 11, an end is connected between the reverse input end of resistance R 30 and operational amplifier UID, other end ground connection, the positive input of operational amplifier U1D is connected to described decompression voltage regulator output by resistance R 21, resistance R 38, in parallel with capacitor C 10 and put ground connection by parallel connection after R42 series connection, its another point in parallel is connected between the positive input of resistance R 21 and operational amplifier UID, the output of operational amplifier U1D forms the output of described threshold value comparison circuit by resistance R 31, the output of operational amplifier U1D also is connected to the positive input of operational amplifier UID by resistance R 25.
In described delay setting circuit, there is resistance R 29 in parallel with diode D12, its point in parallel forms the input of described delay setting circuit, the anode of described diode D12 is connected with resistance R 31, resistance R 26, R27, R28 in parallel and be connected in parallel on resistance R 29 two ends after slide switch S2 is connected, the positive pole of capacitor C 9 is connected with the negative electrode of diode D12, its negative pole is by the resistance R 34 of series connection, R19 is connected to described decompression voltage regulator output, the positive input of operational amplifier U1A is connected to resistance R 19, between R34, the reverse input end of operational amplifier U1A is connected to the point in parallel of resistance R 29 and diode D12, the minus earth of operational amplifier U1A, the positive pole of operational amplifier U1A is connected to described decompression voltage regulator output, the output that the output of operational amplifier U1A is described delay setting circuit, the output of operational amplifier U1A also is connected on its positive input by resistance R 23.
Also comprise alarm output circuit, described alarm output circuit is comprised of resistance R 33, triode Q3, the base stage of described triode Q3 is connected to the output of described operational amplifier U1A by resistance R 33, the grounded emitter of described triode Q3, the external siren of the collector electrode of described triode Q3.
Described controllable silicon drive circuit is the double silicon control drive circuit, D1 in capacitor C 1 one ends and rectified three-phase circuit, D2, the negative electrode of D3 connects, the other end is connected with release, resistance R 2, in parallel with capacitor C 1 after the R43 series connection, the negative electrode of the anode of controllable silicon T1 and controllable silicon T2 is connected in series rear and resistance R 2, the R43 parallel connection, the intermediate point of controllable silicon T1 and controllable silicon T2 and resistance R 2, the intermediate point of R43 connects, the control utmost point of controllable silicon T2 is connected to controllable silicon T1 by resistance R 8, the T2 intermediate point, the described control utmost point is also by resistance R 3, diode D5 is connected to described decompression voltage regulator, the control utmost point of controllable silicon T1 is connected with resistance R 12 and is connected to the negative electrode of controllable silicon T1 by it with capacitor C 3 in parallel, the control utmost point of controllable silicon T1 also is connected to the signal output part of delay setting circuit by resistance R 22.
Also comprise hookup, an end connects and is connected with described rectified three-phase circuit, and the other end is connected with the primary side of zero sequence current mutual inductor, and described hookup comprises test switch, resistance R 13, the R14 of series connection successively.
Technique scheme of the present utility model has the following advantages compared to existing technology:
(1) a kind of residual current protection circuit described in the utility model, also comprise current settings and signal amplification circuit, threshold value comparison circuit, delay setting circuit, described current settings is connected with the zero sequence current mutual inductor secondary side with signal amplification circuit, described current settings and signal amplification circuit, the threshold value comparison circuit, delay setting circuit connects successively, the signal output part of described delay setting circuit connects described controllable silicon drive circuit, described decompression voltage regulator is connected with described threshold value comparison circuit, the design's circuit is broken the normal procedure, utilize conventional electronic device to build new earth leakage protective platform fully, this protective circuit be take analog circuit as main design, surpass on the Stability and dependability of circuit and take special chip as main protective circuit, and cost is lower, more superior on performance.
(2) a kind of residual current protection circuit described in the utility model; described delay setting circuit is provided with slide switch; and select three different resistance by described slide switch; make the electric capacity of series connection with it can select different discharge times; to reach the controlled purpose of time delay; replaced in the prior art and joined the form of three different tantalum electrochemical capacitors with a resistance, cost-saving.
(3) a kind of residual current protection circuit described in the utility model, designed double silicon control drive circuit is more reliable than single silicon controlled drive circuit, and circuit is more stable, has solved single silicon controlled drive circuit surge technical problem only.Designed decompression voltage regulator, there is lower circuit start operating voltage, this circuit reliability, stability are high, operating voltage range is wide, adopt components and parts still less connected step-down, low cost, low-power consumption, designed positive-negative half-cycle signal amplification circuit, circuit reliability is high, stronger anti-interference is arranged, realized the complete amplification of low signal, for the processing of subsequent conditioning circuit provides stable guarantee, designed threshold value comparison circuit, there is higher antijamming capability, realized processing and the output of signal.
(4) a kind of residual current protection circuit described in the utility model; device working temperature of the present invention is-40 ℃～+ 105 ℃; enlarged working range than prior art; the scope of application is wider; condition is wider, and designed alarm output circuit can be connected with the alarm module with photoelectrical coupler input; simple and reliable, practical.
The accompanying drawing explanation
For content of the present utility model is more likely to be clearly understood, below in conjunction with accompanying drawing, the utility model is described in further detail, wherein,
Fig. 1 is the FB(flow block) of a kind of residual current protection circuit described in the utility model;
Fig. 2 is the circuit diagram of a kind of residual current protection circuit described in the utility model.
Embodiment
The specific embodiment of a kind of residual current protection circuit described in the utility model below is provided.
embodiment 1
As shown in Figure 1, it comprises surge absorbing circuit to the structure of a kind of residual current protection circuit described in the utility model, and input connects respectively three phase lines; Rectified three-phase circuit, its input is connected with described surge absorbing circuit output, and its output is connected with release; Release, be connected with decompression voltage regulator successively with controllable silicon drive circuit, described decompression voltage regulator output services voltage; Zero sequence current mutual inductor, be arranged on three phase mains;
Also comprise current settings and signal amplification circuit, threshold value comparison circuit, delay setting circuit; Described current settings is connected with the zero sequence current mutual inductor secondary side with signal amplification circuit, described current settings is connected successively with signal amplification circuit, threshold value comparison circuit, delay setting circuit, the input of described threshold value comparison circuit and delay setting circuit also is connected with described decompression voltage regulator output respectively, and the signal output part of described delay setting circuit connects described controllable silicon drive circuit.
Described delay setting circuit is provided with slide switch, and selects three different resistance by described slide switch, makes the electric capacity of series connection with it can select different discharge times, and to reach the controlled purpose of time delay, described electric capacity is tantalum electric capacity preferably.
embodiment 2
On the basis of above-described embodiment 1, current settings in residual current protection circuit in the present embodiment and the concrete structure of signal amplification circuit are as follows:, as shown in Figure 2, diode D10 in described current settings and signal amplification circuit, resistance R 18, be connected to the secondary side of described zero sequence current mutual inductor after capacitor C 5 parallel connections, described secondary side one end ground connection, the positive input 5 of operational amplifier U1B is by the resistance R 24 of connecting successively, capacitor C 7, resistance R 20 is connected to the secondary side of described zero sequence current mutual inductor, the intermediate point ground connection of capacitor C 7 and resistance R 24, the reverse input end 6 of described operational amplifier U1B is connected between resistance 20 and capacitor C 7 by resistance R 17, the output 7 of described operational amplifier U1B is by connecting diode D11, diode D11 forms the output of described current settings and signal amplification circuit, the resistance R 15 of series connection, R16 and capacitor C 4 are connected in parallel on reverse input end 6 and output 7 two ends of described operational amplifier U1B, the positive input 10 of operational amplifier U1C is connected between resistance R 17 and resistance R 20 by resistance R 32, the output 8 of operational amplifier U1C is connected to the anode of diode D11, the output 8 of operational amplifier U1C also is connected on reverse input end by resistance R in parallel 39 and capacitor C 12, resistance R 35, R40, R41 parallel connection and an end are connected with slide switch S1, the other end reverse input end 9 of putting ground connection and being connected to described operational amplifier U1C by resistance R 36 in parallel, the described slide switch S1 other end is connected to the secondary side of described zero sequence current mutual inductor.
embodiment 3
Residual current protection circuit in the present embodiment is on the basis of above-described embodiment 1 or 2, used a kind of concrete threshold value comparison circuit, as shown in Figure 2, the input that in described threshold value comparison circuit, resistance R 30 1 ends are described threshold value comparison circuit, described resistance R 30 other ends are connected with the reverse input end 13 of operational amplifier U1D, after resistance R 37 is in parallel with capacitor C 11, an end is connected between resistance R 30 and reverse input end, other end ground connection, the positive input 12 of operational amplifier U1D is connected to described decompression voltage regulator output by resistance R 21, described decompression voltage regulator output voltage is 12V, resistance R 38, in parallel with capacitor C 10 and put ground connection by parallel connection after R42 series connection, its another point in parallel is connected between the positive input of resistance R 21 and operational amplifier UID, the output 14 of operational amplifier U1D forms the output of described threshold value comparison circuit by resistance R 31, the output 14 of operational amplifier U1D also is connected to its positive input by resistance R 25.
In described delay setting circuit in the present embodiment, there is resistance R 29 in parallel with diode D12, its point in parallel forms the input of described delay setting circuit, the anode of described diode D12 is connected with resistance R 31, resistance R 26, R27, R28 in parallel and be connected in parallel on resistance R 29 two ends after slide switch S2 is connected, the positive pole of capacitor C 9 is connected with the negative electrode of diode D12, capacitor C 9 is tantalum electric capacity preferably, by slide switch S2 in resistance R 26, R27, between R28, select to make capacitor C 9 that the different charging intervals be arranged, reach the purpose that can regulate delay time, the negative pole of capacitor C 9 is connected to power cathode, the positive input 3 of operational amplifier U1A is connected to resistance R 19, between R34, the reverse input end 2 of operational amplifier U1A is connected to the point in parallel of resistance R 29 and diode D12, negative pole 11 ground connection of operational amplifier U1A, the positive pole 4 of operational amplifier U1A is connected to described decompression voltage regulator output, the output that the output 1 of operational amplifier U1A is described delay setting circuit, the output 1 of operational amplifier U1A also is connected on described its positive input 3 by resistance R 23.
embodiment 4
The described residual current protection circuit of the present embodiment; also comprise alarm output circuit; as shown in Figure 2; described alarm output circuit is comprised of resistance R 33, triode Q3; the base stage of described triode Q3 is connected to the output of described operational amplifier U1A by resistance R 33; the grounded emitter of described triode Q3, the external siren of the collector electrode of described triode Q3.
In the present embodiment, described controllable silicon drive circuit is the double silicon control drive circuit preferably, D1 in capacitor C 1 one ends and rectified three-phase circuit, D2, the negative electrode of D3 connects, the other end is connected with release, resistance R 2, in parallel with capacitor C 1 after the R43 series connection, the negative electrode of the anode of controllable silicon T1 and controllable silicon T2 is connected in series rear and resistance R 2, the R43 parallel connection, the intermediate point of controllable silicon T1 and controllable silicon T2 and resistance R 2, the intermediate point of R43 connects, the control utmost point of controllable silicon T2 is connected to controllable silicon T1 by resistance R 8, the T2 intermediate point, the described control utmost point is also by resistance R 3, diode D5 is connected to described decompression voltage regulator, the control utmost point of controllable silicon T1 is connected with resistance R 12 and is connected to the negative electrode of controllable silicon T1 by it with capacitor C 3 in parallel, the control utmost point of controllable silicon T1 also is connected to the signal output part of delay setting circuit by resistance R 22.
Also comprise hookup, an end connects and is connected with described rectified three-phase circuit, and the other end is connected with the primary side of zero sequence current mutual inductor, and described hookup comprises test switch, resistance R 13, the R14 of series connection successively.
The operation principle of residual current protection circuit of the present utility model is as follows:
Described current settings and signal amplification circuit, utilize slide switch S1 and resistance R 35, R40, R41 to carry out current settings, resistance R 15, R16, R17, R24 and operational amplifier U1B form inverting amplifier, capacitor C 4 plays filter action, resistance R 32, R36, R39 and operational amplifier U1C form the positive amplifier, capacitor C 2 plays filter action, and the electric leakage small-signal of instrument transformer secondary side is successfully amplified, and then amplifying signal is outputed to described threshold value comparison circuit.
Described threshold value comparison circuit, by resistance R21 dividing potential drop, reference signal is provided, resistance R 38, R42 and capacitor C 10 are follow-up filter circuit, the amplifying signal that described current settings and signal amplification circuit provide provides comparison signal through resistance R 30 dividing potential drops for operational amplifier U1D, resistance R 37 and capacitor C 11 strobe, and realize processing and the comparison of signal, then the signal of processing is outputed to described delay setting circuit.
Described delay setting circuit, in normal operation, while there is no electric leakage signal, prime comparator output high level, by diode D12, to capacitor C 9 chargings, now input 2 voltage signals of operational amplifier U1A are higher than the reference voltage signal (having power supply signal to provide through resistance R 19, R34) of input 3, now, the comparator output low level, no signal output; Electric leakage signal appears in circuit, described threshold value comparison circuit output low level, and now capacitor C 9 starts electric discharge, and selects resistance R 26 or R27 or R28 by slide switch S2, realizes the discharge time that electric capacity is different, to reach the controlled purpose of time delay.When input 2 voltage signals of operational amplifier U1A during lower than the reference voltage signal of input 3, comparator output high level, output Tripout signal is to described controllable silicon drive circuit, during the circuit normal operation, not conducting when the voltage that described controllable silicon drive circuit obtains by resistance R 3 dividing potential drops through D5 by resistance R 2 dividing potential drops mutually limits and makes controllable silicon T2 flat, the double silicon control cocoa bears higher surge voltage; When the Tripout triggering signal is come, controllable silicon T1 conducting, now also conducting thereupon of controllable silicon T2, and then control the release disconnection.
Obviously, above-described embodiment is only for example clearly is described, and is not the restriction to execution mode.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all execution modes.And the apparent variation of being extended out thus or change are still among protection range of the present utility model.
Claims (9)
1. a residual current protection circuit comprises:
Surge absorbing circuit, input connects respectively three phase lines;
Rectified three-phase circuit, its input is connected with described surge absorbing circuit output, and its output is connected with release;
Release, be connected with decompression voltage regulator successively with controllable silicon drive circuit, described decompression voltage regulator output services voltage;
Zero sequence current mutual inductor, be arranged on three phase mains;
It is characterized in that,
Also comprise current settings and signal amplification circuit, threshold value comparison circuit, delay setting circuit; Described current settings is connected with the zero sequence current mutual inductor secondary side with signal amplification circuit, described current settings is connected successively with signal amplification circuit, threshold value comparison circuit, delay setting circuit, the input of described threshold value comparison circuit and delay setting circuit also is connected with described decompression voltage regulator output respectively, and the signal output part of described delay setting circuit connects described controllable silicon drive circuit.
2. a kind of residual current protection circuit according to claim 1; it is characterized in that; described delay setting circuit is provided with slide switch; and select three different resistance by described slide switch; make the electric capacity of series connection with it can select different discharge times, to reach the controlled purpose of time delay.
3. a kind of residual current protection circuit according to claim 2, is characterized in that, described electric capacity is tantalum electric capacity.
4. according to claim 1 or the described a kind of residual current protection circuit of 2 or 3 any one, it is characterized in that, diode D10 in described current settings and signal amplification circuit, resistance R 18, be connected to the secondary side of described zero sequence current mutual inductor after capacitor C 5 parallel connections, described secondary side one end ground connection, the positive input of operational amplifier U1B is by the resistance R 24 of connecting successively, capacitor C 7, resistance R 20 is connected to the secondary side of described zero sequence current mutual inductor, the intermediate point ground connection of capacitor C 7 and resistance R 24, the reverse input end of described operational amplifier U1B is connected between resistance 20 and capacitor C 7 by resistance R 17, the output of described operational amplifier U1B connects the anode of diode D11, the negative electrode of diode D11 forms the output of described current settings and signal amplification circuit, the resistance R 15 of series connection, R16 and capacitor C 4 are connected in parallel on reverse input end and the output two ends of described operational amplifier U1B, the positive input of operational amplifier U1C is connected between resistance R 17 and resistance R 20 by resistance R 32, the output of operational amplifier U1C is connected to the anode of diode D11, the output of operational amplifier U1C also is connected on its reverse input end by resistance R in parallel 39 and capacitor C 12, resistance R 35, R40, R41 parallel connection and an end are connected with the end of slide switch S1 respectively, the other end reverse input end of putting ground connection and being connected to described operational amplifier U1C by resistance R 36 in parallel, the described slide switch S1 other end is connected to the secondary side of described zero sequence current mutual inductor.
5. a kind of residual current protection circuit according to claim 4, it is characterized in that, the input that in described threshold value comparison circuit, resistance R 30 1 ends are described threshold value comparison circuit, described resistance R 30 other ends are connected with the reverse input end of operational amplifier U1D, after resistance R 37 is in parallel with capacitor C 11, an end is connected between the reverse input end of resistance R 30 and operational amplifier UID, other end ground connection, the positive input of operational amplifier U1D is connected to described decompression voltage regulator output by resistance R 21, resistance R 38, in parallel with capacitor C 10 and put ground connection by parallel connection after R42 series connection, its another point in parallel is connected between the positive input of resistance R 21 and operational amplifier UID, the output of operational amplifier U1D forms the output of described threshold value comparison circuit by resistance R 31, the output of operational amplifier U1D also is connected to the positive input of operational amplifier UID by resistance R 25.
6. a kind of residual current protection circuit according to claim 5, it is characterized in that, in described delay setting circuit, there is resistance R 29 in parallel with diode D12, its point in parallel forms the input of described delay setting circuit, the anode of described diode D12 is connected with resistance R 31, resistance R 26, R27, R28 in parallel and be connected in parallel on resistance R 29 two ends after slide switch S2 is connected, the positive pole of capacitor C 9 is connected with the negative electrode of diode D12, its negative pole is by the resistance R 34 of series connection, R19 is connected to described decompression voltage regulator output, the positive input of operational amplifier U1A is connected to resistance R 19, between R34, the reverse input end of operational amplifier U1A is connected to the point in parallel of resistance R 29 and diode D12, the minus earth of operational amplifier U1A, the positive pole of operational amplifier U1A is connected to described decompression voltage regulator output, the output that the output of operational amplifier U1A is described delay setting circuit, the output of operational amplifier U1A also is connected on its positive input by resistance R 23.
7. a kind of residual current protection circuit according to claim 6; it is characterized in that; also comprise alarm output circuit; described alarm output circuit is comprised of resistance R 33, triode Q3; the base stage of described triode Q3 is connected to the output of described operational amplifier U1A by resistance R 33; the grounded emitter of described triode Q3, the external siren of the collector electrode of described triode Q3.
8. a kind of residual current protection circuit according to claim 7, it is characterized in that, described controllable silicon drive circuit is the double silicon control drive circuit, D1 in capacitor C 1 one ends and rectified three-phase circuit, D2, the negative electrode of D3 connects, the other end is connected with release, resistance R 2, in parallel with capacitor C 1 after the R43 series connection, the negative electrode of the anode of controllable silicon T1 and controllable silicon T2 is connected in series rear and resistance R 2, the R43 parallel connection, the intermediate point of controllable silicon T1 and controllable silicon T2 and resistance R 2, the intermediate point of R43 connects, the control utmost point of controllable silicon T2 is connected to controllable silicon T1 by resistance R 8, the T2 intermediate point, the described control utmost point is also by resistance R 3, diode D5 is connected to described decompression voltage regulator, the control utmost point of controllable silicon T1 is connected with resistance R 12 and is connected to the negative electrode of controllable silicon T1 by it with capacitor C 3 in parallel, the control utmost point of controllable silicon T1 also is connected to the signal output part of delay setting circuit by resistance R 22.
9. a kind of residual current protection circuit according to claim 8; it is characterized in that; also comprise hookup; one end connects and is connected with described rectified three-phase circuit; the other end is connected with the primary side of zero sequence current mutual inductor, and described hookup comprises test switch, resistance R 13, the R14 of series connection successively.
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| CN201320527809.0U CN203377585U (en) | 2013-08-28 | 2013-08-28 | Residual current protection circuit |
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| CN201320527809.0U CN203377585U (en) | 2013-08-28 | 2013-08-28 | Residual current protection circuit |
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| CN103956709A (en) * | 2014-04-30 | 2014-07-30 | 罗格朗低压电器（无锡）有限公司 | Plastic housing type residual current protector with remote residual current tripping warning function |
| CN105182152A (en) * | 2015-08-20 | 2015-12-23 | 浙江凯发电气股份有限公司 | Electric leakage detection circuit for automatic recovery leakage protector |
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| CN107332201A (en) * | 2017-08-23 | 2017-11-07 | 浙江夏兴电子科技股份有限公司 | One kind is applied to three-phase circuit simulated leakage current generating circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103956709A (en) * | 2014-04-30 | 2014-07-30 | 罗格朗低压电器（无锡）有限公司 | Plastic housing type residual current protector with remote residual current tripping warning function |
| CN103956709B (en) * | 2014-04-30 | 2017-01-11 | 罗格朗低压电器（无锡）有限公司 | Plastic housing type residual current protector with remote residual current tripping warning function |
| CN105322503A (en) * | 2014-07-22 | 2016-02-10 | 金华市奥凯电器有限公司 | Integrated leakage relay |
| CN105182152A (en) * | 2015-08-20 | 2015-12-23 | 浙江凯发电气股份有限公司 | Electric leakage detection circuit for automatic recovery leakage protector |
| CN106816858A (en) * | 2015-12-02 | 2017-06-09 | 浙江正泰电器股份有限公司 | Time lagged type residual current circuit breaker circuit |
| CN107404110A (en) * | 2017-07-13 | 2017-11-28 | 成都麦隆电气有限公司 | A kind of non-isolated energy storage three-phase off-network inversion electric power system |
| CN107332201A (en) * | 2017-08-23 | 2017-11-07 | 浙江夏兴电子科技股份有限公司 | One kind is applied to three-phase circuit simulated leakage current generating circuit |
| CN109378793A (en) * | 2018-12-14 | 2019-02-22 | 二三电器（上海）有限公司 | Residual current protecting electronic trip unit |
| CN113162009A (en) * | 2020-01-07 | 2021-07-23 | 华为技术有限公司 | Over-energy protection circuit, residual current device, electronic equipment and distribution box |
| CN113162009B (en) * | 2020-01-07 | 2023-07-11 | 华为技术有限公司 | Over-energy protection circuit, residual current device, electronic equipment and distribution box |
| CN113937729A (en) * | 2020-06-29 | 2022-01-14 | 华为技术有限公司 | Residual current protection device and distribution box |
| CN113937729B (en) * | 2020-06-29 | 2023-03-03 | 华为技术有限公司 | Residual current protection device and distribution box |
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