CN204012652U - A kind of earth leakage protective device based on relay - Google Patents
A kind of earth leakage protective device based on relay Download PDFInfo
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- CN204012652U CN204012652U CN201420450895.4U CN201420450895U CN204012652U CN 204012652 U CN204012652 U CN 204012652U CN 201420450895 U CN201420450895 U CN 201420450895U CN 204012652 U CN204012652 U CN 204012652U
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- leakage current
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- 230000001681 protective effect Effects 0.000 title claims abstract description 37
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 6
- 101000919036 Klebsiella oxytoca (strain ATCC 8724 / DSM 4798 / JCM 20051 / NBRC 3318 / NRRL B-199 / KCTC 1686) Diol dehydratase-reactivating factor small subunit Proteins 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 6
- 230000001012 protector Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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- 238000009434 installation Methods 0.000 description 1
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Abstract
The application openly provides a kind of earth leakage protective device based on relay, comprising: by the instrument transformer of power line, be configured to the leakage current of Real-Time Monitoring power line, and in the time leakage current being detected, output leakage current signal; Power supply, is configured to the voltage from power line to carry out step-down and rectification, and the voltage after step-down and rectification is offered to leakage current checkout gear and relay; Leakage current checkout gear, has the input that receives leakage current signal; And output, in the time receiving leakage current signal, output first signal to switching tube with driving switch pipe; Switching tube, is configured to cut-off relay; And relay, in the time of switching tube conducting, relay promotes the tripping mechanism of earth leakage protective device, then disconnects miniature circuit breaker.Circuit design of the present disclosure is simple, reliability is high, single-phase and heterogeneous design can be good at compatibility, and can compatibility be used in upper incoming line or lower inlet wire pattern.
Description
Technical field
The utility model relates to earth leakage protective device, more particularly, relates to a kind of earth leakage protective device based on relay.
Background technology
New 3 mutually 4 line supply standards specify in situation that any two lines exist, must ensure that earth leakage protective device can normally work, electronic solution is originally all by L+N and L+L power taking, does not meet new standard-required.
And scheme circuit of the present disclosure can be very simple, technical scheme of the present disclosure combines the advantage of electronic leakage protector ELE and electromagnetic leakage protector ELM.
Existing thyristor scheme is mainly from L+N or L+L power taking, and the cut-off of thyristor is subject to the voltage control in thyristor loop.
In existing ELE scheme, tripping coil easily burns out, and needs large Current Control to work.
In the scheme of existing ELM, different earth leakage protective devices (RCD) needs different magnetic cores (core), also has the calibration trouble of magnetic core.
Fig. 1 shows the schematic diagram of existing ELM scheme.
As described in Figure 1, electromagnetic leakage protector comprises: instrument transformer 101, electronic circuit 102, relay 103.It should be appreciated by those skilled in the art that and in Fig. 1, only show relevant element, and omitted other elements.
The power line of registering one's residence is through instrument transformer 101.The leakage current of the power line that instrument transformer 101 Real-Time Monitorings are registered one's residence, and in the time leakage current being detected, output leakage current signal is to electronic circuit 102.Leakage current signal moves to make the miniature circuit breaker MCB coordinating with earth leakage protective device to disconnect by electronic circuit 102 trigger relays 103, finally makes the main circuit that this earth leakage protective device is protected disconnect, and realizes creepage protection function.
Instrument transformer 101 is powered for relay 103 by electronic circuit 102, instrument transformer 101 for the supply current that relay 103 provides very little, therefore, ELM scheme is higher to the required precision of relay 103, thereby the cost of relay 103 is also larger.
Fig. 2 shows the schematic diagram of existing ELE scheme.
As described in Figure 2, electronic leakage protector comprises: instrument transformer 201, electronic circuit 202, tripping coil 203.It should be appreciated by those skilled in the art that and in Fig. 2, only show relevant element, and omitted other elements.
The power line of registering one's residence is through instrument transformer 201.The leakage current of the power line that instrument transformer 201 Real-Time Monitorings are registered one's residence, and in the time leakage current being detected, output leakage current signal is to electronic circuit 202.Leakage current signal triggers tripping coil 203 by electronic circuit 202 and moves to make the miniature circuit breaker MCB coordinating with earth leakage protective device to disconnect, and finally makes the main circuit that this earth leakage protective device is protected disconnect, and realizes creepage protection function.
The required voltage of tripping coil 203 is large, and therefore to need two-phase power line be its power supply via electronic circuit 202 to tripping coil 203, and therefore, in ELE scheme, power consumption is large.In addition, can see according to Fig. 2, if it is that tripping coil 203 is powered that user adopts lower wiring patter as described in Figure 2, so in the time there is leakage current, because the power supply providing for tripping coil 203 by lower inlet wire is by last very long, electronic circuit 202 may continue to trigger tripping coil 203, finally causes tripping coil 203 to burn out.
Utility model content
Other aspect of the present utility model and advantage part will be set forth in the description below, also have part from describe, to find out significantly, or can in practice of the present utility model, obtain.
The disclosure is the novel leakage protection equipment based on existing ELE and ELM.The disclosure is to drive the mode of a relay to go to promote the mechanical structure of circuit breaker with earth leakage protective IC.
The disclosure provides a kind of earth leakage protective device, comprising: by the instrument transformer of power line, be configured to the leakage current of Real-Time Monitoring power line, and in the time leakage current being detected, output leakage current signal; Power supply, is configured to the voltage from power line to carry out step-down and rectification, and the voltage after step-down and rectification is offered to leakage current checkout gear and relay; Leakage current checkout gear, has the input that receives leakage current signal; And output, in the time receiving leakage current signal, output first signal to switching tube with driving switch pipe; Switching tube, is configured to cut-off relay; And relay, in the time of switching tube conducting, relay promotes the tripping mechanism of earth leakage protective device, then disconnects miniature circuit breaker.
The disclosure is easy to control, and rapidly, the impact of not powered.In the time having electric leakage, the signal of earth leakage protective IC (integrated circuit) output directly goes to drive the loop of relay, and relay produces mechanical thrust and removes to promote miniature circuit breaker MCB.
Fully combine the advantage of ELE and ELM two schemes according to earth leakage protective device of the present utility model.
According to earth leakage protective device utilization of the present utility model, conventional earth leakage protective IC drives relay, thereby cost is low and meet new electric leakage product standard.
Relay is the device that produces power by coil, and required precision is lower, and cost can reduce at least half.
Can be used for 3 phase 4 line power supply circuits according to earth leakage protective device of the present utility model, and solved upper incoming line and lower inlet wire installation question.
Solve according to earth leakage protective device of the present utility model the problem that inductor is easy to burn out, and be all low voltage control, improved fail safe, simultaneously also can be for two-phase power supply circuits.
Brief description of the drawings
In conjunction with the drawings preferred embodiment of the present utility model is described in detail, above and other object of the present utility model, characteristic and advantage will become apparent, and wherein identical label is specified the unit of same structure, and therein:
Fig. 1 shows the schematic diagram of existing ELM scheme.
Fig. 2 shows the schematic diagram of existing ELE scheme.
Fig. 3 shows according to the structure chart of the relay of the utility model embodiment.And
Fig. 4 shows according to the block diagram of the earth leakage protective device based on relay of the utility model embodiment.
Embodiment
Below with reference to the accompanying drawing that the utility model embodiment is shown, the utility model is fully described.But the utility model can be realized in many different forms, and not will be understood that and be limited to embodiment described here.On the contrary, provide these embodiment to make the disclosure thorough and complete, and will give full expression to scope of the present utility model to those skilled in the art.In the accompanying drawings, for the sake of clarity amplified assembly.
Should be appreciated that it can be directly connected or coupled to another element or can have intermediary element in the time claiming " element " " to be connected to " or " coupling " arrives another element.On the contrary, when claiming element " to be directly connected to " or when " being directly coupled to " another element, not having intermediary element.Identical Reference numeral is indicated identical element.Term "and/or" used herein comprises any and all combinations of one or more relevant projects of listing.
Although should be appreciated that and can use term first, second, third, etc. to describe each element, assembly and/or part here, these elements, assembly and/or part are not limited by these terms.These terms are only for mutually making a distinction element, assembly or part.Therefore, the first element discussed below, assembly or part can be called the second element, assembly or part under the prerequisite that does not deviate from the utility model teaching.
Term used herein is only used to describe the object of specific embodiment, and is not intended to limit the utility model.Singulative used herein " one ", " one " and " that (this) " are also intended to comprise plural form, unless pointed out clearly in context not comprise.Be to be understood that, term " comprises " existence of indicating where used in this disclosure described feature, integer, step, operation, element and/or assembly, but does not get rid of existence or the interpolation of one or more other features, integer, step, operation, element, assembly and/or its combination.
Unless otherwise defined, all terms used herein (comprising technology and scientific terminology) have the common identical meanings of understanding with the utility model those of ordinary skill in the field.It should also be understood that, should be interpreted as having the implication consistent with implication in they contexts in correlation technique such as those terms that define in common dictionary, and do not apply idealized or extremely formal meaning explain, unless definition so clearly here.
Fig. 3 shows according to the structure chart of the relay of the utility model embodiment.
As shown in Figure 3, relay comprises inductor, armature, magnet, spring, plate and pin.Very little according to relay dropout energy of the present disclosure, require low to power supply.
Fig. 4 shows according to the block diagram of the earth leakage protective device based on relay of the utility model embodiment.
As shown in Figure 4, comprise according to earth leakage protective device of the present utility model: power supply 401, leakage current checkout gear 402, switching tube 403, relay 404 and instrument transformer 405.
Instrument transformer 405, by power line, is configured to the leakage current of Real-Time Monitoring power line (for example, the power line of registering one's residence), and in the time leakage current being detected, output leakage current signal.
Power supply 401 is configured to the voltage from power line to carry out step-down and rectification, and the voltage after step-down and rectification is offered to leakage current checkout gear 402 and relay 404.
Power supply 401 comprises at least one resistance-capacitance depressurization unit 4011 and current rectifying and wave filtering circuit 4012.Power supply 401 utilizes resistance-capacitance depressurization unit 4011 respectively the voltage of the each phase from power line to be carried out to step-down, and utilize current rectifying and wave filtering circuit 4012 to carry out rectification to the voltage of step-down, and by the Voltage-output after rectification the first end to relay 404, to power for relay 404.In addition, the output of power supply 401 is also connected to the power end of leakage current checkout gear 402, thinks that leakage current checkout gear 402 provides power supply.
Resistance-capacitance depressurization unit 4011 comprises resistor and capacitor, and the first end of resistor is connected to one of live wire of power line, and the second end of resistor is connected to the first end of capacitor; The second end of capacitor is connected to current rectifying and wave filtering circuit.
In Fig. 4, each resistance-capacitance depressurization unit 4011 by a series connection of 3 live wires (L line) is connected with current rectifying and wave filtering circuit 4012.Zero line (N line) is directly connected with current rectifying and wave filtering circuit 4012.According to earth leakage protective device of the present utility model, the dropout energy required due to relay is very little, therefore, as long as any two lines are normally worked, can be relay the described energy of threading off is provided, also and can ensure that earth leakage protective device normally works.
Leakage current checkout gear 402, has the input that receives leakage current signal; And output, in the time receiving leakage current signal, output first signal to switching tube 403 with driving switch pipe 403.Switching tube 403 is configured to cut-off relay 404.
In the time of switching tube 403 conducting, relay 404 moves, and promotes the tripping mechanism of earth leakage protective device, then disconnects miniature circuit breaker.
As described in Figure 4, described switching tube can be for example transistor, and as Fig. 4, the base stage of transistor 403 is connected to the output of current sensing means 402, the grounded emitter of transistor 403, and the collector electrode of transistor 403 is connected to the second end of relay 404.But it should be appreciated by those skilled in the art that and also can adopt other devices that can realize identical function to realize switching tube.
Leakage current IC (RCB IC) 402 can adopt existing leakage circuit IC, ASIC DDRB, M54123L, CS54123, the XX54123 etc. of such as Schneider Electric Devices.It should be appreciated by those skilled in the art that existing and the following chip that can realize said function or integrated circuit may be used to the disclosure.Earth leakage protective device of the present disclosure is the earth leakage protective device being used under 3 phase 4 line electric power thus supplied.Meanwhile, earth leakage protective device of the present disclosure also can be for 3 phase 3 lines or 1 (two-phase) electric power thus supplied of 2 lines mutually.
And, can solve in 3 upper incoming line and the lower inlet wire problems that 4 lines are powered mutually according to the earth leakage protective device of the utility model embodiment.
Be to explanation of the present utility model above, and should be considered to limitation ot it.Although described some exemplary embodiments of the present utility model, those skilled in the art will easily understand, and under the prerequisite that does not deviate from teaching of the present utility model and advantage, can carry out many amendments to exemplary embodiment.Therefore, all such modifications are all intended to be included within the scope of the utility model that claims limit.Should be appreciated that is above to explanation of the present utility model, and should not be considered to be limited to disclosed specific embodiment, and the amendment intention of the disclosed embodiments and other embodiment is comprised within the scope of the appended claims.The utility model is limited by claims and equivalent thereof.
Claims (5)
1. an earth leakage protective device, comprising:
By the instrument transformer of power line, be configured to the leakage current of Real-Time Monitoring power line, and in the time leakage current being detected, output leakage current signal;
Power supply, is configured to the voltage from power line to carry out step-down and rectification, and the voltage after step-down and rectification is offered to leakage current checkout gear and relay;
Leakage current checkout gear, has the input that receives leakage current signal; And output, in the time receiving leakage current signal, output first signal to switching tube with driving switch pipe;
Switching tube, is configured to cut-off relay; And
Relay, in the time of switching tube conducting, relay promotes the tripping mechanism of earth leakage protective device, then disconnects miniature circuit breaker.
2. earth leakage protective device as claimed in claim 1, wherein, described power supply comprises:
At least one resistance-capacitance depressurization unit, is configured to respectively the voltage of the each phase from power line to carry out reduced pressure operation, and by the Voltage-output of step-down to current rectifying and wave filtering circuit; And
Current rectifying and wave filtering circuit, carries out rectification operation to the voltage of step-down, and by the Voltage-output after rectification power end and the relay to leakage current checkout gear.
3. earth leakage protective device as claimed in claim 2, wherein, described resistance-capacitance depressurization unit comprises resistor and capacitor, and the first end of resistor is connected to one of live wire of power line, and the second end of resistor is connected to the first end of capacitor; The second end of capacitor is connected to current rectifying and wave filtering circuit.
4. earth leakage protective device as claimed in claim 3, wherein, the zero line of power line is directly connected to current rectifying and wave filtering circuit.
5. earth leakage protective device as claimed in claim 4, wherein, leakage current checkout gear can adopt the chip of ASIC DDRB model, chip, the chip of CS54123 model or the chip of XX54123 model of M54123L model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420450895.4U CN204012652U (en) | 2014-08-11 | 2014-08-11 | A kind of earth leakage protective device based on relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420450895.4U CN204012652U (en) | 2014-08-11 | 2014-08-11 | A kind of earth leakage protective device based on relay |
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| CN204012652U true CN204012652U (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420450895.4U Expired - Lifetime CN204012652U (en) | 2014-08-11 | 2014-08-11 | A kind of earth leakage protective device based on relay |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798934A (en) * | 2021-02-01 | 2021-05-14 | 浙江人民电器有限公司 | A circuit board detection circuit |
-
2014
- 2014-08-11 CN CN201420450895.4U patent/CN204012652U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798934A (en) * | 2021-02-01 | 2021-05-14 | 浙江人民电器有限公司 | A circuit board detection circuit |
| CN112798934B (en) * | 2021-02-01 | 2025-09-02 | 浙江人民电器有限公司 | A detection circuit for a circuit board |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141210 |