CN204809839U - Electric leakage circuit breaker - Google Patents
Electric leakage circuit breaker Download PDFInfo
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- CN204809839U CN204809839U CN201520646194.2U CN201520646194U CN204809839U CN 204809839 U CN204809839 U CN 204809839U CN 201520646194 U CN201520646194 U CN 201520646194U CN 204809839 U CN204809839 U CN 204809839U
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Abstract
The utility model discloses an electric leakage circuit breaker, including zero sequence current transformer, trip coil, a rectifier circuit, controllable switch circuit and operational amplifier circuit etc, four inputs of a rectifier circuit respectively separately with three -phase four -wire power supply's A phase line, B phase line, C phase line and N looks line connection, first output is connected with trip coil's one end, the second output is connected with zero sequence current transformer's secondary winding's one end, the first output and trip coil's the other end of controllable switch circuit are connected, and the second output is connected with a rectifier circuit's second output, and the input is connected with zero sequence current transformer's secondary winding's the other end, operational amplifier circuit's first input end is connected with zero sequence current transformer's secondary winding's one end, and the second input is connected with secondary winding's the other end. This electric leakage circuit breaker can still can normally work at the arbitrary double -phase out of order or scarce phase time that A looks, B looks, C congruence N take a fancy to.
Description
Technical field
The utility model relates to earth leakage protective device technical field, is specifically related to a kind of residual current circuit breaker.
Background technology
Residual current circuit breaker is can the switch of auto-action when in circuit, leakage current exceedes predetermined value, such as, when circuit system electric leakage or the person get an electric shock, residual current circuit breaker can action with deenergization, play a protective role.
The working power of current existing residual current circuit breaker generally takes from A phase, B phase, the C phase of three phase mains; obtain after adopting three-phase star bridge-type first rectification circuit to carry out rectification; if when having any one to have fault or phase shortage mutually in three-phase; residual current circuit breaker still can normally work, and namely still can play a protective role.But; circuit based on current residual current circuit breaker cannot be applicable to three-phase and four-line power supply; it comprises A phase, B phase, C phase and N phase; in addition; if have any two-phase power supply when there is fault or phase shortage; when circuit system electric leakage or the person get an electric shock, residual current circuit breaker is by cisco unity malfunction, namely can not cut off the electricity supply and play a protective role.
Utility model content
Therefore, the technical problems to be solved in the utility model is to overcome the defect that in prior art, residual current circuit breaker normally cannot work when any two-phase power supply exists fault or phase shortage, thus provides a kind of and any two-phase in the A phase of three-phase and four-line power supply, B phase, C phase and N phase can have the residual current circuit breaker that still can normally work when fault or phase shortage.
For this reason, a kind of residual current circuit breaker of the present utility model, comprising: zero sequence current mutual inductor, tripping coil, the first rectification circuit, gate-controlled switch circuit, sampling resistor, the second rectification circuit and operational amplification circuit;
The first input end of described first rectification circuit is connected with the C phase line of three-phase and four-line power supply, second input is connected with the B phase line of three-phase and four-line power supply, 3rd input is connected with the A phase line of three-phase and four-line power supply, four-input terminal is connected with the N phase line of three-phase and four-line power supply, first output is connected with one end of described tripping coil, and the second output is connected with one end of the secondary winding of described zero sequence current mutual inductor;
First output of described gate-controlled switch circuit is connected with the other end of described tripping coil, and the second output is connected with the second output of described first rectification circuit, and input is connected with the output of described operational amplification circuit;
The first input end of described operational amplification circuit is connected with one end of the secondary winding of described zero sequence current mutual inductor, second input is connected with the other end of the secondary winding of described zero sequence current mutual inductor, and power supply end is connected with the other end of described tripping coil;
Between one end that described sampling resistor is connected across the secondary winding of described zero sequence current mutual inductor and the other end;
Described second rectification circuit is used for carrying out rectification to the voltage that the two ends of the secondary winding of described zero sequence current mutual inductor export.
Preferably, described first rectification circuit comprises the first diode, the second diode, the 3rd diode, the 4th diode, the 5th diode, the 6th diode, the 7th diode and the 8th diode;
The positive pole of described first diode is connected with the negative pole of described second diode, and it connects the first input end of common point as described first rectification circuit; The positive pole of described 3rd diode is connected with the negative pole of described 4th diode, and it connects second input of common point as described first rectification circuit; The positive pole of described 5th diode is connected with the negative pole of described 6th diode, and it connects three input of common point as described first rectification circuit; The positive pole of described 7th diode is connected with the negative pole of described 8th diode, and it connects the four-input terminal of common point as described first rectification circuit;
The negative pole of described first diode is connected with the negative pole of the negative pole of described 3rd diode, the negative pole of described 5th diode and described 7th diode respectively, and it connects first output of common point as described first rectification circuit; The positive pole of described second diode is connected with the positive pole of the positive pole of described 4th diode, the positive pole of described 6th diode and described 8th diode respectively, and it connects second output of common point as described first rectification circuit.
Preferably, described gate-controlled switch circuit comprises thyristor;
The anode of described thyristor is as the first output of described gate-controlled switch circuit, and negative electrode is as the second output of described gate-controlled switch circuit, and gate pole is as the input of described gate-controlled switch circuit.
Preferably, described second rectification circuit comprises the 9th diode and the tenth diode;
The negative pole of described 9th diode is connected with one end of the secondary winding of described zero sequence current mutual inductor, and positive pole is connected with the other end of the secondary winding of described zero sequence current mutual inductor; The positive pole of described tenth diode is connected with one end of the secondary winding of described zero sequence current mutual inductor, and negative pole is connected with the other end of the secondary winding of described zero sequence current mutual inductor.
Preferably, also comprise:
First piezo-resistance, it is connected across between the A phase line of three-phase and four-line power supply and B phase line;
Second piezo-resistance, it is connected across between the A phase line of three-phase and four-line power supply and C phase line;
3rd piezo-resistance, it is connected across between the A phase line of three-phase and four-line power supply and N phase line;
4th piezo-resistance, it is connected across between the B phase line of three-phase and four-line power supply and C phase line;
5th piezo-resistance, it is connected across between the B phase line of three-phase and four-line power supply and N phase line; And
6th piezo-resistance, it is connected across between the C phase line of three-phase and four-line power supply and N phase line.
Preferably, also comprise:
Latch, its input is connected with the output of described operational amplification circuit, and output is connected with the input of described gate-controlled switch circuit, and power supply end is connected with the power supply end of described operational amplification circuit.
Preferably, described operational amplification circuit and latch adopt earth leakage protective integrated chip to realize.
Preferably, also comprise: normal open switch and the first current-limiting resistance, between any two phase lines being connected across three-phase and four-line power supply after described normal open switch and described first current-limiting resistance are connected in series.
Preferably, also comprise:
Second current-limiting resistance, it is serially connected between one end of the secondary winding of described zero sequence current mutual inductor and the first input end of described operational amplification circuit;
3rd current-limiting resistance, it is serially connected between the other end of the secondary winding of described zero sequence current mutual inductor and the second input of described operational amplification circuit.
Preferably, also comprise:
First electric capacity, between its one end being connected across the secondary winding of described zero sequence current mutual inductor and the other end;
Second electric capacity and filter resistance, between the first output being connected across described first rectification circuit after described second electric capacity and described filter resistance are connected in series and the second output.
Technical solutions of the utility model, tool has the following advantages:
1. the residual current circuit breaker that provides of the utility model, distinguished separately and the A phase line of three-phase and four-line power supply by four inputs arranging the first rectification circuit, B phase line, C phase line is connected with N phase line, and by obtaining the working power of other circuit in residual current circuit breaker after the first rectifier circuit rectifies, if in the A phase line of three-phase and four-line power supply, B phase line, when any two phase lines in C phase line and N phase line have fault or a phase shortage, the working power of residual current circuit breaker has become two-phase from three-phase and four-line, but still there is the power supply of working power, so residual current circuit breaker can also normally work, get an electric shock when there being people or grid power leakage time, this residual current circuit breaker still can disconnect in time, cut-out power supply plays a protective role, improve the reliability of residual current circuit breaker.
2. the residual current circuit breaker that provides of the utility model, by adopting these eight diodes of the first to the 8th diode to be built into four phase star bridge-type first rectification circuits, effectively can improve power factor, improving ripple frequency, thus significantly reduce harmonic influence, improve current generated quality.
3. the residual current circuit breaker that provides of the utility model, just can realize gate-controlled switch function by arranging a thyristor, under the prerequisite of performance that ensure that residual current circuit breaker product, reducing the cost of product.
4. the residual current circuit breaker that provides of the utility model, be connected in antiparallel between latter two diodes in parallel to one end and the other end of the secondary winding of zero sequence current mutual inductor by adopting, achieve the rectification of the two ends output voltage to secondary winding, and have employed less device and just achieve rectification function, further save the cost of product.
5. the residual current circuit breaker that provides of the utility model; by arranging the first to the 6th piezo-resistance; and be connected across between AB, AC, AN, BC, BN, CN phase line respectively; when having switch or thunderbolt to bring out produced surge voltage in three-phase and four-line electric power system; exceed the threshold value transient switching of piezo-resistance (VDR1-VDR6); by the filtering of high frequency overvoltage signal, thus late-class circuit and equipment can be protected.
6. the residual current circuit breaker that provides of the utility model, by adopting latch can provide stable, reliable high level voltage signal for the input of gate-controlled switch circuit, further increases the reliability of residual current circuit breaker.
7. the residual current circuit breaker that provides of the utility model, by adopting earth leakage protective integrated chip, improve the integration degree of product, more facilitating production and the assembling of product, also reduce the volume of product.
8. the residual current circuit breaker that provides of the utility model; by arranging normal open switch and the first current-limiting resistance between any two phase lines of three-phase and four-line power supply; when pressing normal open switch; electric current is had to flow through through only there being a phase line in the phase line of zero sequence current mutual inductor; now; zero is not equal to by the vector of each phase current of a winding of zero sequence current mutual inductor; thus the switch that can control to be serially connected in each phase line of three-phase and four-line power supply disconnects, play the effect of the creepage protection function checking residual current circuit breaker.
9. the residual current circuit breaker that provides of the utility model, by arranging the second current-limiting resistance and the 3rd current-limiting resistance can prevent gate-controlled switch circuit, especially thyristor is burnt by big current.
10. the residual current circuit breaker that provides of the utility model, effectively filtering can be delivered to gate-controlled switch circuit, the especially noise signal of thyristor by arranging the first electric capacity.
The residual current circuit breaker that 11. the utility model provide, can the effective noise signal that exports from the first rectification circuit of filtering by arranging the second electric capacity and filter resistance.
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 theory diagram of a concrete example of residual current circuit breaker in the utility model embodiment;
Fig. 2 is the theory diagram of a concrete example of residual current circuit breaker in the utility model embodiment;
Fig. 3 is the theory diagram of a concrete example of residual current circuit breaker in the utility model embodiment.
Reference numeral: 1-first rectification circuit, 2-gate-controlled switch circuit, 3-second rectification circuit, 4-operational amplification circuit, 5-latch, 6-earth leakage protective integrated chip circuitry, BE-zero sequence current mutual inductor, RA-tripping coil, VT-thyristor, SF-normal open switch, QF-switch, IC-earth leakage protective integrated chip, R1-sampling resistor, R2-first current-limiting resistance, R3-second current-limiting resistance, R4-the 3rd current-limiting resistance, R5-divider resistance, R6-filter resistance, the peripheral electric capacity of C1 to C7-earth leakage protective integrated chip, C8-first electric capacity, C9-second electric capacity, D1-first diode, D2-second diode, D3-the 3rd diode, D4-the 4th diode, D5-the 5th diode, D6-the 6th diode, D7-the 7th diode, D8-the 8th diode, D9-the 9th diode, D10-the tenth diode, VDR1-first piezo-resistance, VDR1-second piezo-resistance, VDR3-the 3rd piezo-resistance, VDR4-the 4th piezo-resistance, VDR5-the 5th piezo-resistance, VDR6-the 6th piezo-resistance.
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, term " first ", " second ", " the 3rd " 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, and such as, can be directly be connected, also indirectly can be connected by intermediary, can also be the connection of two element internals.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. 1 shows the theory diagram of a concrete example of the residual current circuit breaker of an embodiment, as shown in Figure 1, this residual current circuit breaker comprises: zero sequence current mutual inductor BE, tripping coil RA, the first rectification circuit 1, gate-controlled switch circuit 2, sampling resistor R1, the second rectification circuit 3 and operational amplification circuit 4.
The first input end of the first rectification circuit 1 is connected with the C phase line of three-phase and four-line power supply, second input is connected with the B phase line of three-phase and four-line power supply, 3rd input is connected with the A phase line of three-phase and four-line power supply, four-input terminal is connected with the N phase line of three-phase and four-line power supply, first output is connected with one end of tripping coil RA, and the second output is connected with one end of the secondary winding of zero sequence current mutual inductor BE.
First output of gate-controlled switch circuit 2 is connected with the other end of tripping coil RA, and the second output is connected with the second output of the first rectification circuit 1, and input is connected with the output of described operational amplification circuit 4.Gate-controlled switch circuit 2 is not for when input receiving voltage signal, first gate-controlled switch circuit 2 is in off-state, first output and the second output separated, when input receiving voltage signal, gate-controlled switch circuit 2 will be made to close, conducting between the first output and the second output.
The first input end of operational amplification circuit 4 is connected with one end of the secondary winding of zero sequence current mutual inductor BE, second input is connected with the other end of the secondary winding of described zero sequence current mutual inductor BE, power supply end is connected with the other end of tripping coil RA, and the voltage that the two ends for the secondary winding by zero sequence current mutual inductor BE export amplifies.
A windings in series of zero sequence current mutual inductor BE in three-phase and four-line power supply circuit, between one end that sampling resistor R1 is connected across the secondary winding of zero sequence current mutual inductor BE and the other end.The voltage that second rectification circuit 3 exports for the two ends of the secondary winding to described zero sequence current mutual inductor BE carries out rectification.
The working power of other circuit in residual current circuit breaker is obtained after first rectification circuit 1 pair three-phase and four-line power supply carries out rectification, the control circuit part of residual current circuit breaker is made up of gate-controlled switch circuit 2 and the first rectification circuit 1, zero sequence current mutual inductor BE is the input part of residual current circuit breaker, tripping coil RA is the execution part of residual current circuit breaker, for controlling the break-make of the switch QF be serially connected in each phase line of three-phase and four-line power supply.Below the course of work of this residual current circuit breaker is described:
When three-phase and four-line power supply normal power supply, equalled zero by the vector of each phase current of a zero sequence current mutual inductor BE winding, now, be connected to influence electricity on the sampling resistor R1 in the secondary winding of zero sequence current mutual inductor BE to flow through, do not have voltage signal to export, the input of gate-controlled switch circuit 2 does not receive voltage signal, and it is in off-state, namely control circuit part is in open-circuit condition, thus tripping coil RA is failure to actuate.
When three-phase and four-line power supply abnormal electrical power, when namely there is electric leakage or personal electrocution conditions, some electric current of the load end of residual current circuit breaker does not flow through residual current circuit breaker, now, zero is not equal to by the vector of each phase current of a winding of zero sequence current mutual inductor BE, the sampling resistor R1 that the secondary winding of zero sequence current mutual inductor BE connects there is induced current to flow through, and produce induced voltage, this induced voltage produces stable high level voltage signal after operational amplification circuit 4 amplifies, be delivered to the input of gate-controlled switch circuit 2, make conducting between the first output of gate-controlled switch circuit 2 and the second output, the i.e. control circuit part conducting of residual current circuit breaker, thus have electric current to flow through in tripping coil RA, and produce magnetic field, the dynamic iron core action of tripping coil RA drives tripping mechanism, the switch QF be serially connected in each phase line of three-phase and four-line power supply is disconnected, cut off three-phase and four-line power supply, thus the protective effect played when producing electric leakage or the person gets an electric shock.
Four inputs by arranging the first rectification circuit in the present embodiment are distinguished separately and the A phase line of three-phase and four-line power supply, B phase line, C phase line is connected with N phase line, and by obtaining the working power of other circuit in residual current circuit breaker after the first rectifier circuit rectifies, if in the A phase line of three-phase and four-line power supply, B phase line, when any two phase lines in C phase line and N phase line have fault or a phase shortage, the working power of residual current circuit breaker has become two-phase from three-phase and four-line, but still there is the power supply of working power, so residual current circuit breaker can also normally work, get an electric shock when there being people or grid power leakage time, this residual current circuit breaker still can disconnect in time, cut-out power supply plays a protective role, improve the reliability of residual current circuit breaker.
As a kind of preferred implementation, as shown in Figure 3, first rectification circuit 1 is four phase star bridge-type first rectification circuits, comprises the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the 5th diode D5, the 6th diode D6, the 7th diode D7 and the 8th diode D8.
The positive pole of the first diode D1 is connected with the negative pole of the second diode D2, and namely the first diode D1 and the second diode D2 is connected in series formation first brachium pontis, and it connects the first input end of common point as the first rectification circuit 1; The positive pole of the 3rd diode D3 is connected with the negative pole of the 4th diode D4, and namely the 3rd diode D3 and the 4th diode D4 is connected in series formation second brachium pontis, and it connects second input of common point as the first rectification circuit 1; The positive pole of the 5th diode D5 is connected with the negative pole of the 6th diode D6, and namely the 5th diode D5 and the 6th diode D6 is connected in series formation the 3rd brachium pontis, and it connects three input of common point as the first rectification circuit 1; The positive pole of the 7th diode D7 is connected with the negative pole of the 8th diode D8, and namely the 7th diode D7 and the 8th diode D8 is connected in series formation four bridge legs, and it connects the four-input terminal of common point as the first rectification circuit 1.
The negative pole of the first diode D1 is connected with the negative pole of the negative pole of the 3rd diode D3, the negative pole of the 5th diode D5 and the 7th diode D7 respectively, and it connects first output of common point as the first rectification circuit 1; The positive pole of the second diode D2 is connected with the positive pole of the positive pole of the 4th diode D4, the positive pole of the 6th diode D6 and the 8th diode D8 respectively, and it connects second output of common point as the first rectification circuit 1.Those skilled in the art is to be understood that, the circuit that first rectification circuit is not limited to be built by the above-mentioned first to the 8th diode realizes, also can be realized by other first rectification circuits that can carry out rectification for three-phase and four-line power supply, such as half controlled first rectification circuit, entirely controlled first rectification circuit etc.
Be built into four phase star bridge-type first rectification circuits by employing first to these eight diodes of the 8th diode in the present embodiment, effectively can improve power factor, improve ripple frequency, thus significantly reduce harmonic influence, improve current generated quality.
As a kind of preferred implementation, as shown in Figure 3, gate-controlled switch circuit 2 comprises thyristor VT, and its anode is as the first output of gate-controlled switch circuit 2, and negative electrode is as the second output of gate-controlled switch circuit 2, and gate pole is as the input of gate-controlled switch circuit 2.Those skilled in the art is to be understood that, gate-controlled switch circuit is not limited to be realized by above-mentioned thyristor, also can be realized by other elements that can realize gate-controlled switch function, such as, can form after two Thyristors in series connect, also can be made up of bidirectional thyristor.
Just can realize gate-controlled switch function by arranging a thyristor in the present embodiment, under the prerequisite of performance that ensure that residual current circuit breaker product, reducing the cost of product.
As a kind of preferred implementation, as shown in Figure 3, the second rectification circuit 3 comprises the 9th diode D9 and the tenth diode D10.The negative pole of the 9th diode D9 is connected with one end of the secondary winding of zero sequence current mutual inductor BE, and positive pole is connected with the other end of the secondary winding of zero sequence current mutual inductor BE; The positive pole of the tenth diode D10 is connected with one end of the secondary winding of zero sequence current mutual inductor BE, and negative pole is connected with the other end of the secondary winding of zero sequence current mutual inductor BE.It will be understood by those of skill in the art that the second rectification circuit is not limited to be realized by foregoing circuit, also can be realized by other circuit that can realize rectification function.
Be connected in antiparallel between latter two diodes in parallel to one end and the other end of the secondary winding of zero sequence current mutual inductor BE by adopting in the present embodiment, achieve the rectification of the two ends output voltage to secondary winding, and have employed less device and just achieve rectification function, further save the cost of product.
As a kind of preferred implementation, as shown in Figure 3, residual current circuit breaker also comprises: the first piezo-resistance VDR1, the second piezo-resistance VDR1, the 3rd piezo-resistance VDR3, the 4th piezo-resistance VDR4, the 5th piezo-resistance VDR5 and the 6th piezo-resistance VDR6.First piezo-resistance VDR1 is connected across between the A phase line of three-phase and four-line power supply and B phase line, second piezo-resistance VDR1 is connected across between the A phase line of three-phase and four-line power supply and C phase line, 3rd piezo-resistance VDR3 is connected across between the A phase line of three-phase and four-line power supply and N phase line, 4th piezo-resistance VDR4 is connected across between the B phase line of three-phase and four-line power supply and C phase line, 5th piezo-resistance VDR5 is connected across between the B phase line of three-phase and four-line power supply and N phase line, and the 6th piezo-resistance VDR6 is connected across between the C phase line of three-phase and four-line power supply and N phase line.
By arranging the first to the 6th piezo-resistance in the present embodiment; and be connected across between AB, AC, AN, BC, BN, CN phase line respectively; when having switch or thunderbolt to bring out produced surge voltage in three-phase and four-line electric power system; exceed the threshold value transient switching of piezo-resistance (VDR1-VDR6); by the filtering of high frequency overvoltage signal, thus late-class circuit and equipment are protected.
As a kind of preferred implementation, as shown in Figure 2, residual current circuit breaker also comprises: latch 5, its input is connected with the output of operational amplification circuit 4, output is connected with the input of gate-controlled switch circuit 2, power supply end is connected with the power supply end of operational amplification circuit 4, is namely also the other end being connected to tripping coil RA.The voltage signal that operational amplification circuit 4 exports inputs to latch 5, when voltage is lower than setting, the output voltage of latch 5 remains low level, when voltage exceedes setting, the high level voltage signal of latch 5 stable output, is supplied to the input of gate-controlled switch circuit.By adopting latch can provide stable, reliable high level voltage signal for the input of gate-controlled switch circuit, further increase the reliability of residual current circuit breaker.
As a kind of preferred implementation; as shown in Figure 3; operational amplification circuit 4 and latch 5 can adopt earth leakage protective integrated chip circuitry 6 to realize; this earth leakage protective integrated chip circuitry 6 comprises earth leakage protective integrated chip IC, peripheral electric capacity C1-C7 and divider resistance R5, the divider resistance R5 power supply to earth leakage protective integrated chip IC is input to its power supply end after carrying out dividing potential drop current limliting.This earth leakage protective integrated chip IC can adopt electric leakage chip M54123 to realize, and sequence number and the pin name of its each pin are as shown in the table:
| Sequence number | Pin name | Pin explanation |
| 1 | VR | Reference voltage |
| 2 | IN | Input |
| 3 | GND | Ground connection |
| 4 | OD | Differential amplification exports |
| 5 | SC | Flipflop input terminal |
| 6 | NR | Noise absorbent end |
| 7 | OS | Output |
| 8 | VS | Supply voltage |
By adopting earth leakage protective integrated chip in the present embodiment, improve the integration degree of product, more facilitating production and the assembling of product, also reduce the volume of product.
As a kind of preferred implementation, as shown in Figure 3, residual current circuit breaker also comprises: normal open switch SF and the first current-limiting resistance R2.Between any two phase lines being connected across three-phase and four-line power supply after normal open switch SF and the first current-limiting resistance R2 is connected in series, be connected across between A phase line and C phase line as shown in Figure 3, form the check circuit of the creepage protection function of residual current circuit breaker.
By arranging normal open switch and the first current-limiting resistance between any two phase lines of three-phase and four-line power supply in the present embodiment; when pressing normal open switch; electric current is had to flow through through only there being a phase line in the phase line of zero sequence current mutual inductor; now; zero is not equal to by the vector of each phase current of a winding of zero sequence current mutual inductor; thus the switch that can control to be serially connected in each phase line of three-phase and four-line power supply disconnects, play the effect of the creepage protection function checking residual current circuit breaker.
As a kind of preferred implementation, as shown in Figure 3, residual current circuit breaker also comprises: the second current-limiting resistance R3, it is serially connected between one end of the secondary winding of zero sequence current mutual inductor BE and the first input end of operational amplification circuit 4.And comprise: the 3rd current-limiting resistance R4, it is serially connected between the other end of the secondary winding of zero sequence current mutual inductor BE and the second input of operational amplification circuit 4.By arranging the second current-limiting resistance and the 3rd current-limiting resistance can prevent gate-controlled switch circuit, especially thyristor is burnt by big current.
As a kind of preferred implementation, as shown in Figure 3, residual current circuit breaker also comprises: the first electric capacity C8, between its one end being connected across the secondary winding of zero sequence current mutual inductor BE and the other end, effectively filtering can be delivered to gate-controlled switch circuit, the especially noise signal of thyristor.
As a kind of preferred implementation, as shown in Figure 3, residual current circuit breaker also comprises: the second electric capacity C9 and filter resistance R6, between its first output being connected across the first rectification circuit 1 after being connected in series and the second output, and can the effective noise signal that exports from the first rectification circuit of filtering.
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 (10)
1. a residual current circuit breaker, it is characterized in that, comprising: zero sequence current mutual inductor (BE), tripping coil (RA), the first rectification circuit (1), gate-controlled switch circuit (2), sampling resistor (R1), the second rectification circuit (3) and operational amplification circuit (4);
The described first input end of the first rectification circuit (1) is connected with the C phase line of three-phase and four-line power supply, second input is connected with the B phase line of three-phase and four-line power supply, 3rd input is connected with the A phase line of three-phase and four-line power supply, four-input terminal is connected with the N phase line of three-phase and four-line power supply, first output is connected with the one end of described tripping coil (RA), and the second output is connected with one end of the secondary winding of described zero sequence current mutual inductor (BE);
First output of described gate-controlled switch circuit (2) is connected with the other end of described tripping coil (RA), second output is connected with the second output of described first rectification circuit (1), and input is connected with the output of described operational amplification circuit (4);
The first input end of described operational amplification circuit (4) is connected with one end of the secondary winding of described zero sequence current mutual inductor (BE), second input is connected with the other end of the secondary winding of described zero sequence current mutual inductor (BE), and power supply end is connected with the other end of described tripping coil (RA);
Between one end that described sampling resistor (R1) is connected across the secondary winding of described zero sequence current mutual inductor (BE) and the other end;
The voltage that described second rectification circuit (3) exports for the two ends of the secondary winding to described zero sequence current mutual inductor (BE) carries out rectification.
2. residual current circuit breaker according to claim 1, it is characterized in that, described first rectification circuit (1) comprises the first diode (D1), the second diode (D2), the 3rd diode (D3), the 4th diode (D4), the 5th diode (D5), the 6th diode (D6), the 7th diode (D7) and the 8th diode (D8);
The positive pole of described first diode (D1) is connected with the negative pole of described second diode (D2), and it connects the first input end of common point as described first rectification circuit (1); The positive pole of described 3rd diode (D3) is connected with the negative pole of described 4th diode (D4), and it connects second input of common point as described first rectification circuit (1); The positive pole of described 5th diode (D5) is connected with the negative pole of described 6th diode (D6), and it connects three input of common point as described first rectification circuit (1); The positive pole of described 7th diode (D7) is connected with the negative pole of described 8th diode (D8), and it connects the four-input terminal of common point as described first rectification circuit (1);
The negative pole of described first diode (D1) is connected with the negative pole of the negative pole of described 3rd diode (D3), the negative pole of described 5th diode (D5) and described 7th diode (D7) respectively, and it connects first output of common point as described first rectification circuit (1); The positive pole of described second diode (D2) is connected with the positive pole of the positive pole of described 4th diode (D4), the positive pole of described 6th diode (D6) and described 8th diode (D8) respectively, and it connects second output of common point as described first rectification circuit (1).
3. residual current circuit breaker according to claim 1, is characterized in that, described gate-controlled switch circuit (2) comprises thyristor (VT);
The anode of described thyristor (VT) is as the first output of described gate-controlled switch circuit (2), negative electrode is as the second output of described gate-controlled switch circuit (2), and gate pole is as the input of described gate-controlled switch circuit (2).
4. residual current circuit breaker according to claim 1, is characterized in that, described second rectification circuit (3) comprises the 9th diode (D9) and the tenth diode (D10);
The negative pole of described 9th diode (D9) is connected with one end of the secondary winding of described zero sequence current mutual inductor (BE), and positive pole is connected with the other end of the secondary winding of described zero sequence current mutual inductor (BE); The positive pole of described tenth diode (D10) is connected with one end of the secondary winding of described zero sequence current mutual inductor (BE), and negative pole is connected with the other end of the secondary winding of described zero sequence current mutual inductor (BE).
5. residual current circuit breaker according to claim 1, is characterized in that, also comprises:
First piezo-resistance (VDR1), it is connected across between the A phase line of three-phase and four-line power supply and B phase line;
Second piezo-resistance (VDR1), it is connected across between the A phase line of three-phase and four-line power supply and C phase line;
3rd piezo-resistance (VDR3), it is connected across between the A phase line of three-phase and four-line power supply and N phase line;
4th piezo-resistance (VDR4), it is connected across between the B phase line of three-phase and four-line power supply and C phase line;
5th piezo-resistance (VDR5), it is connected across between the B phase line of three-phase and four-line power supply and N phase line; And
6th piezo-resistance (VDR6), it is connected across between the C phase line of three-phase and four-line power supply and N phase line.
6. residual current circuit breaker according to claim 1, is characterized in that, also comprises:
Latch (5), its input is connected with the output of described operational amplification circuit (4), output is connected with the input of described gate-controlled switch circuit (2), and power supply end is connected with the power supply end of described operational amplification circuit (4).
7. residual current circuit breaker according to claim 6, is characterized in that, described operational amplification circuit (4) and latch (5) adopt earth leakage protective integrated chip circuitry (6) to realize.
8. residual current circuit breaker according to claim 1, it is characterized in that, also comprise: normal open switch (SF) and the first current-limiting resistance (R2), between any two phase lines being connected across three-phase and four-line power supply after described normal open switch (SF) and described first current-limiting resistance (R2) are connected in series.
9. residual current circuit breaker according to claim 1, is characterized in that, also comprises:
Second current-limiting resistance (R3), it is serially connected between one end of the secondary winding of described zero sequence current mutual inductor (BE) and the first input end of described operational amplification circuit (4);
3rd current-limiting resistance (R4), it is serially connected between the other end of the secondary winding of described zero sequence current mutual inductor (BE) and the second input of described operational amplification circuit (4).
10. residual current circuit breaker according to claim 1, is characterized in that, also comprises:
First electric capacity (C8), between its one end being connected across the secondary winding of described zero sequence current mutual inductor (BE) and the other end;
Second electric capacity (C9) and filter resistance (R6), between the first output being connected across described first rectification circuit (1) after described second electric capacity (C9) and described filter resistance (R6) are connected in series and the second output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520646194.2U CN204809839U (en) | 2015-08-25 | 2015-08-25 | Electric leakage circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520646194.2U CN204809839U (en) | 2015-08-25 | 2015-08-25 | Electric leakage circuit breaker |
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| Publication Number | Publication Date |
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| CN204809839U true CN204809839U (en) | 2015-11-25 |
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| CN (1) | CN204809839U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356803A (en) * | 2016-09-27 | 2017-01-25 | 福建通力达实业有限公司 | Control circuit of circuit breaker |
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2015
- 2015-08-25 CN CN201520646194.2U patent/CN204809839U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356803A (en) * | 2016-09-27 | 2017-01-25 | 福建通力达实业有限公司 | Control circuit of circuit breaker |
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