CN204992531U - Three -phase four -wire leakage protection circuit - Google Patents
Three -phase four -wire leakage protection circuit Download PDFInfo
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- CN204992531U CN204992531U CN201520810877.7U CN201520810877U CN204992531U CN 204992531 U CN204992531 U CN 204992531U CN 201520810877 U CN201520810877 U CN 201520810877U CN 204992531 U CN204992531 U CN 204992531U
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Abstract
The utility model discloses a three -phase four -wire leakage protection circuit, including first, second, third, fourth piezo -resistor, three -phase four -wire rectifier circuit, trip coil, silicon controlled rectifier, signal detection circuit and zero sequence current transformer, a piezo -resistor cross -over connection is between A, N phase line, and the 2nd piezo -resistor cross -over connection is between B, N phase line, and the 3rd piezo -resistor cross -over connection is between C, N phase line, three -phase four -wire rectifier circuit's input respectively with A, B and C looks line connection, the output is connected with the silicon controlled rectifier positive pole, trip coil's one end and N looks line connection, other end ground connection, the minus earth of silicon controlled rectifier, the control end is connected with signal detection circuit's output, the cross -over connection of fourth piezo -resistor is between the positive pole and negative pole of silicon controlled rectifier, signal detection circuit's input is connected with zero sequence current transformer's output. The utility model discloses a circuit has long service life, difficult mistake is threaded off and the three -phase four -wire in the advantage that can both normally work during the circular telegram of an arbitrary congruence N phase line.
Description
Technical field
The utility model relates to electronic circuit design field, is specifically related to a kind of three-phase and four-line leakage protection circuit, especially a kind of three-phase and four-line leakage protection circuit be applicable in three-phase and four-line residual current operated protective device.
Background technology
In current domestic low voltage electrical apparatus industry; the leakage protection circuit of three-phase and four-line residual current operated protective device as shown in Figure 1; generally adopt the mode of fixing a phase and N phase line and powering; if this breaks mutually; then three-phase and four-line residual current operated protective device will not work and lose efficacy; protector just can not carry out earth leakage protective, so can cause great hidden danger to personal safety.Secondly; in this leakage protection circuit; the surge absorbing circuit be made up of piezo-resistance is that design is in the front end of power unit; adding piezo-resistance between phase and phase; when there being surge impact; absorb the piezo-resistance of the complete forward end of surge energy, the useful life of such piezo-resistance will shorten, and the useful life of three-phase and four-line residual current operated protective device is shortened.And surge impact also has certain impact to the device of rear end, will be higher to the requirement of back end device, such device, compared to requiring that low device price can be higher, makes cost to increase.Again; that tripping coil is serially connected in A, B or C phase line in this leakage protection circuit; be placed on piezo-resistance front end; easily like this cause false tripping; and require that coil ability to bear will be got well; compared to ability to bear, such coil requires that low coil price can be higher, cost also can be made to increase.
Utility model content
Therefore; if the defect that the technical problems to be solved in the utility model is to overcome leakage protection circuit short, easy false tripping in useful life of the prior art and have disconnected phase time circuit not work etc., thus the three-phase and four-line leakage protection circuit a kind of long service life, not easily false tripping being provided and still can normally working when any phase and the energising of N phase line in three-phase and four-line.
For this reason, a kind of three-phase and four-line leakage protection circuit of the present utility model, comprises the first piezo-resistance, the second piezo-resistance, the 3rd piezo-resistance, the 4th piezo-resistance, three-phase and four-line rectification circuit, tripping coil, controllable silicon, signal deteching circuit and zero sequence current mutual inductor;
Described first piezo-resistance is connected across between the A phase line of three-phase and four-line power supply and N phase line, described second piezo-resistance is connected across between the B phase line of three-phase and four-line power supply and N phase line, and described 3rd piezo-resistance is connected across between the C phase line of three-phase and four-line power supply and N phase line;
The first input end of described three-phase and four-line rectification circuit is connected with described A phase line, second input is connected with described B phase line, 3rd input is connected with described C phase line, output is connected with described silicon controlled anode, exports for all AC rectification being become direct current when a phase any in three-phase and four-line and the energising of N phase line;
One end of described tripping coil is connected with described N phase line, other end ground connection;
Described silicon controlled minus earth, control end is connected with the output of described signal deteching circuit;
Described 4th piezo-resistance is connected across between described silicon controlled anode and negative electrode;
The input of described signal deteching circuit is connected with the output of described zero sequence current mutual inductor, and the signal for inputting according to its input produces the control signal controlling described controlled silicon conducting or disconnection and exports.
Preferably, described three-phase and four-line rectification circuit is three-phase and four-line half-wave rectifying circuit.
Preferably, the first resistance and the first electric capacity is also comprised;
One end of described first resistance is connected with described silicon controlled anode, and the other end is connected with one end of described first electric capacity;
The other end of described first electric capacity is connected with described silicon controlled negative electrode.
Preferably, the second resistance, the 3rd resistance and voltage-stabiliser tube is also comprised;
One end of described second resistance is connected with the output of described three-phase and four-line rectification circuit respectively with one end of described 3rd resistance, and the other end of described second resistance is connected with the negative electrode of described voltage-stabiliser tube respectively with the other end of described 3rd resistance; The negative electrode of described voltage-stabiliser tube is connected with the power end of described signal deteching circuit, and anode is connected with described silicon controlled negative electrode.
Preferably, the 4th resistance and switch is also comprised;
Described one end of 4th resistance is connected with the N phase line in three-phase and four-line power supply, and the other end connects wire and is connected with one end of described switch through after the coil loop of described zero sequence current mutual inductor; The other end of described switch is connected with the arbitrary phase line in A, B and C phase line of three-phase and four-line power supply.
Technical solutions of the utility model, tool has the following advantages:
1. the three-phase and four-line leakage protection circuit that provides of the utility model; by arranging three-phase and four-line rectification circuit, when achieving any phase and the energising of N phase line, three-phase and four-line leakage protection circuit all can normally work; improve the reliability of circuit integrity, more reliably can protect personal safety.By arranging four piezo-resistances, forming surge absorbing circuit by four piezo-resistances, greatly can improve the antisurge impact capacity of circuit, improving silicon controlled protective effect simultaneously, preventing controllable silicon breakdown.By tripping coil being serially connected in N phase line, one end ground connection in tripping coil two ends, thus not easily there is the situation of false tripping, further increase the reliability of circuit integrity, and by arranging one end ground connection, improve anti-interference, the EMC performance of circuit.
2. the three-phase and four-line leakage protection circuit that provides of the utility model, by arranging the first resistance and the first electric capacity, effectively protecting controllable silicon, further increasing the reliability of circuit integrity.
3. the three-phase and four-line leakage protection circuit that provides of the utility model, consists of the design of decompression voltage regulators, improves reliability two resistor coupled in parallel, and simple and practical.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is execution modes more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit diagram of leakage protection circuit of the prior art;
Fig. 2 is the theory diagram of the three-phase and four-line leakage protection circuit of a kind of embodiment of the utility model;
Fig. 3 is the circuit diagram of the three-phase and four-line leakage protection circuit of a kind of embodiment of the utility model.
Reference numeral: 1-three-phase and four-line rectification circuit, 2-signal deteching circuit, 3-zero sequence current mutual inductor, 4-resistance capaciting absorpting circuit, 5-decompression voltage regulator, 6-test line.
Embodiment
Be clearly and completely described the technical solution of the utility model below in conjunction with accompanying drawing, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
In description of the present utility model, it should be noted that, in addition, term " first ", " second ", " the 3rd " etc. only for describing object, and can not be interpreted as instruction or hint relative importance.Unless otherwise clearly defined and limited, term " is connected ", " connection " should be interpreted broadly, such as, can be directly be connected, also indirectly can be connected by intermediary, can also be the connection of two element internals, can be wireless connections, also can be wired connection.For the ordinary skill in the art, concrete condition the concrete meaning of above-mentioned term in the utility model can be understood.
In addition, if below in the described different execution mode of the utility model involved technical characteristic do not form conflict each other and just can be combined with each other.
Fig. 2 shows a kind of theory diagram of three-phase and four-line leakage protection circuit of embodiment; as shown in Figure 2, this three-phase and four-line leakage protection circuit comprises the first piezo-resistance VDR1, the second piezo-resistance VDR2, the 3rd piezo-resistance VDR3, the 4th piezo-resistance VDR4, three-phase and four-line rectification circuit 1, tripping coil L1, controllable silicon SCR, signal deteching circuit 2 and zero sequence current mutual inductor 3.First piezo-resistance VDR1 is connected across between the A phase line of three-phase and four-line power supply and N phase line, second piezo-resistance VDR2 is connected across between the B phase line of three-phase and four-line power supply and N phase line, and the 3rd piezo-resistance VDR3 is connected across between the C phase line of three-phase and four-line power supply and N phase line.The first input end of three-phase and four-line rectification circuit 1 is connected with A phase line, second input is connected with B phase line, 3rd input is connected with C phase line, output is connected with the anode of controllable silicon SCR, export for AC rectification being become direct current when a phase any in three-phase and four-line and the energising of N phase line, namely no matter in A, B, C phase line which mutually or two-phase to break phase, three-phase and four-line rectification circuit all has voltage to export.One end of tripping coil L1 is connected with N phase line, other end ground connection.The minus earth of controllable silicon SCR, control end is connected with the output of signal deteching circuit 2.4th piezo-resistance VDR4 is connected across between the anode of controllable silicon SCR and negative electrode.The input of signal deteching circuit 2 is connected with the output of zero sequence current mutual inductor 3, and the signal for inputting according to its input produces the control signal output controlling controllable silicon SCR and be turned on or off.Test line 6 is through the coil loop of zero sequence current mutual inductor 3, and when there is the situations such as electric leakage in test line 6, zero sequence current mutual inductor 3 will have induced current to export, and is detected by signal deteching circuit 2.
Above-mentioned first piezo-resistance VDR1, second piezo-resistance VDR2, 3rd piezo-resistance VDR3, in 4th piezo-resistance VDR4, three piezo-resistance (the first piezo-resistance VDR1, second piezo-resistance VDR2, 3rd piezo-resistance VDR3) be arranged on front end, a piezo-resistance (the 4th piezo-resistance VDR4) is arranged on rear end, when there being surge impact, three, front end piezo-resistance and one, rear end piezo-resistance work simultaneously, jointly share surge impact, improve the useful life of piezo-resistance, and can play a protective role to the controllable silicon of the 4th piezo-resistance VDR4 rear end, prevent breakdown.
Above-mentioned three-phase and four-line leakage protection circuit; by arranging three-phase and four-line rectification circuit, when achieving any phase and the energising of N phase line, three-phase and four-line leakage protection circuit all can normally work; improve the reliability of circuit integrity, more reliably can protect personal safety.By arranging four piezo-resistances, forming surge absorbing circuit by four piezo-resistances, greatly can improve the antisurge impact capacity of circuit, improving silicon controlled protective effect simultaneously, preventing controllable silicon breakdown.By tripping coil being serially connected in N phase line, one end ground connection in tripping coil two ends, thus not easily there is the situation of false tripping, further increase the reliability of circuit integrity, and by arranging one end ground connection, improve anti-interference, the EMC performance of circuit.
Fig. 3 shows a kind of circuit diagram of three-phase and four-line leakage protection circuit of embodiment, and as shown in Figure 3, preferably, above-mentioned three-phase and four-line rectification circuit 1 is three-phase and four-line half-wave rectifying circuit, meets new standard GB16917.1-2014.Three-phase and four-line half-wave rectifying circuit comprises the first diode D1, the second diode D2 and the 3rd diode D3.The anode of the first diode D1 is connected with A phase line, the anode of the second diode D2 is connected with B phase line, the anode of the 3rd diode D3 is connected with C phase line, and the negative electrode of the first diode D1, the negative electrode of the second diode D2 are connected with the anode of controllable silicon SCR respectively with the negative electrode of the 3rd diode D3.
Preferably, as shown in Figure 3, three-phase and four-line leakage protection circuit also comprises the first resistance R1 and the first electric capacity C1.One end of first resistance R1 is connected with the anode of controllable silicon SCR, and the other end is connected with one end of the first electric capacity C1.The other end of the first electric capacity C1 is connected with the negative electrode of controllable silicon SCR.First resistance R1 and the first electric capacity C1 forms resistance capaciting absorpting circuit 4, effectively protects controllable silicon, further increases the reliability of circuit integrity.
Preferably, as shown in Figure 3, three-phase and four-line leakage protection circuit also comprises the second resistance, the 3rd resistance and voltage-stabiliser tube.One end of second resistance is connected with the output of three-phase and four-line rectification circuit respectively with one end of the 3rd resistance, and the other end of the second resistance is connected with the negative electrode of voltage-stabiliser tube respectively with the other end of the 3rd resistance; The negative electrode of voltage-stabiliser tube is connected with the power end of signal deteching circuit, and anode is connected with silicon controlled negative electrode.Second resistance R2, the 3rd resistance R3 and voltage-stabiliser tube D7 form decompression voltage regulator 5, consist of the design of decompression voltage regulator, improve reliability two resistor coupled in parallel, and simple and practical.
Preferably, three-phase and four-line leakage protection circuit also comprises the 4th resistance R4 and switch S 1.One end of 4th resistance R4 is connected with the N phase line in three-phase and four-line power supply, and the other end connects wire and is connected with one end of switch S 1 through after the coil loop of described zero sequence current mutual inductor 3; The other end of switch S 1 is connected with the arbitrary phase line in A, B and C phase line of three-phase and four-line power supply.Such as, as shown in Figure 3, the other end of switch S 1 is connected with the C phase line in three-phase and four-line power supply.4th resistance R4 and switch S 1 form hookup, can realize the pretest to three-phase and four-line leakage protection circuit.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not 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 the need to also giving all execution modes.And thus the apparent change of extending out or variation be still among the protection range that the utility model creates.
Claims (5)
1. a three-phase and four-line leakage protection circuit, it is characterized in that, comprise the first piezo-resistance (VDR1), the second piezo-resistance (VDR2), the 3rd piezo-resistance (VDR3), the 4th piezo-resistance (VDR4), three-phase and four-line rectification circuit (1), tripping coil (L1), controllable silicon (SCR), signal deteching circuit (2) and zero sequence current mutual inductor (3);
Described first piezo-resistance (VDR1) is connected across between the A phase line of three-phase and four-line power supply and N phase line, described second piezo-resistance (VDR2) is connected across between the B phase line of three-phase and four-line power supply and N phase line, and described 3rd piezo-resistance (VDR3) is connected across between the C phase line of three-phase and four-line power supply and N phase line;
The first input end of described three-phase and four-line rectification circuit (1) is connected with described A phase line, second input is connected with described B phase line, 3rd input is connected with described C phase line, output is connected with the anode of described controllable silicon (SCR), exports for all AC rectification being become direct current when a phase any in three-phase and four-line and the energising of N phase line;
One end of described tripping coil (L1) is connected with described N phase line, other end ground connection;
The minus earth of described controllable silicon (SCR), control end is connected with the output of described signal deteching circuit (2);
Between the anode that described 4th piezo-resistance (VDR4) is connected across described controllable silicon (SCR) and negative electrode;
The input of described signal deteching circuit (2) is connected with the output of described zero sequence current mutual inductor (3), and the signal for inputting according to its input produces the control signal output controlling described controllable silicon (SCR) and be turned on or off.
2. three-phase and four-line leakage protection circuit according to claim 1, is characterized in that, described three-phase and four-line rectification circuit (1) is three-phase and four-line half-wave rectifying circuit.
3. three-phase and four-line leakage protection circuit according to claim 1, is characterized in that, also comprises the first resistance (R1) and the first electric capacity (C1);
One end of described first resistance (R1) is connected with the anode of described controllable silicon (SCR), and the other end is connected with one end of described first electric capacity (C1);
The other end of described first electric capacity (C1) is connected with the negative electrode of described controllable silicon (SCR).
4. three-phase and four-line leakage protection circuit according to claim 1, is characterized in that, also comprises the second resistance (R2), the 3rd resistance (R3) and voltage-stabiliser tube (D7);
One end of described second resistance (R2) is connected with the output of described three-phase and four-line rectification circuit (1) respectively with one end of described 3rd resistance (R3), and the other end of described second resistance (R2) is connected with the negative electrode of described voltage-stabiliser tube (D7) respectively with the other end of described 3rd resistance (R3); The negative electrode of described voltage-stabiliser tube (D7) is connected with the power end of described signal deteching circuit (2), and anode is connected with the negative electrode of described controllable silicon (SCR).
5. the three-phase and four-line leakage protection circuit according to any one of claim 1-4, is characterized in that, also comprises the 4th resistance (R4) and switch (S1);
One end of described 4th resistance (R4) is connected with the N phase line in three-phase and four-line power supply, and the other end connects wire and is connected with one end of described switch (S1) through after the coil loop of described zero sequence current mutual inductor (3); The other end of described switch (S1) is connected with the arbitrary phase line in A, B and C phase line of three-phase and four-line power supply.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520810877.7U CN204992531U (en) | 2015-10-19 | 2015-10-19 | Three -phase four -wire leakage protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520810877.7U CN204992531U (en) | 2015-10-19 | 2015-10-19 | Three -phase four -wire leakage protection circuit |
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| CN204992531U true CN204992531U (en) | 2016-01-20 |
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| CN201520810877.7U Active CN204992531U (en) | 2015-10-19 | 2015-10-19 | Three -phase four -wire leakage protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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2015
- 2015-10-19 CN CN201520810877.7U patent/CN204992531U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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