CN102915883A - Electronic tripper - Google Patents
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- CN102915883A CN102915883A CN2011102231810A CN201110223181A CN102915883A CN 102915883 A CN102915883 A CN 102915883A CN 2011102231810 A CN2011102231810 A CN 2011102231810A CN 201110223181 A CN201110223181 A CN 201110223181A CN 102915883 A CN102915883 A CN 102915883A
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Abstract
The invention discloses an electronic tripper for a circuit breaker. The electronic tripper is characterized by comprising a display unit, the display content of the display unit directly or indirectly indicates the current age value of the circuit breaker, and the current age value is the ratio of the current deprecation service life of the circuit breaker and the rated service life of the circuit breaker. In a preferential embodiment, the electronic tripper comprises a preset unit, an implantation unit, a recording unit, a conversion unit, an accumulation unit, an output unit and the display unit. The electronic tripper can accurately, conveniently and timely provide the indications of deprecation service life and the residual service life of the circuit breaker for the users.
Description
Technical field
The present invention relates to the electronic trip unit for circuit breaker.
Background technology
Circuit breaker is for connection and breaking current and circuit and equipment is provided a kind of low-voltage electrical apparatus of protection in the situation of current overload.In the process of using, the dynamic/static contact of circuit breaker can constantly be worn and torn, thereby causes the minimizing of contact over travel and the rapid increase of contact Contact resistance.This deterioration that electrically contacts can cause appliance circuit overheated, burn, but and then the generation of fire hazard.Therefore, accurately grasp the operating position of circuit breaker and become one of problem that users are concerned about very much in order in time change.
For the operating position of circuit breaker, user's focus mainly is useful life and the remaining life that circuit breaker has been lost, and judges whether to need to change circuit breaker with this.
In the prior art, judge that useful life or remaining life that circuit breaker has been lost mainly contain following dual mode:
-record the disjunction number of times of circuit breaker by a counter, judge the useful life that circuit breaker has been lost with this.For example, if the disjunction of the circuit breaker of a certain model of counter records is the moving contact machinery folding 80 times of circuit breaker, then be defined as the useful life that circuit breaker has been lost with 80 times.Further, the user determines the specified useful life of the circuit breaker of this model according to for example experience, for example for disjunction 100 times, thus, can determine that remaining life is 20 times, judges whether to need to change circuit breaker with this.Yet those skilled in the art know, and each time breaking current that circuit breaker experiences in circuit often has different sizes, and the electric current of different sizes is to the useful life of circuit breaker, and losing of especially electric useful life is not identical.That is to say that same circuit breaker is along with the difference of electric circumstance, in its specified useful life, namely the normal number of times of disjunction is often not identical.Therefore, be inaccurate with specified useful life of circuit breaker being assumed to simply a certain definite disjunction number of times, the remaining life of the circuit breaker of knowing by inference thus also is inaccurate.Therefore, judge that according to this mode the operating position of circuit breaker can't guide the user in time to change circuit breaker exactly.
-according to the variation of the relative position of circuit breaker dynamic/static contact, judge the contact abrasion situation, lost as circuit breaker or the sign in remaining useful life with this.For example, the NW circuit breaker for Schneider (Schneider) company can adopt aforesaid way.Although this indication can be grasped the operating position of circuit breaker comparatively exactly, it carries out observe and decide after needing the professional to open circuit breaker, not only depends on professional's technical merit, and operation is quite inconvenient.
This shows that all there is certain weak point in aforesaid way of the prior art.
On the other hand; electronic trip unit is a kind of extremely important and common parts on the low-voltage circuit breaker; be used for detecting, the electric parameter in the record, circuit, and the faults such as overcurrent, overvoltage are done to judge with instruction dropout actuator disjunction load, thus the safety of protection circuit and equipment.If electronic trip unit can accurately show useful life and remaining life that circuit breaker has been lost, aforementioned technical problem then might be readily solved.Yet, but fail on this electronic trip unit in the prior art to realize that reason is:
First, for the above mentioned first kind of way of the record of disjunction number of times being judged the circuit breaker operating position by counter, although the function of counter that portions of electronics release of the prior art is integrated, make it possible to show the disjunction number of times of circuit breaker, the foundation of changing circuit breaker is provided as the user.Yet, owing to can't determine specified useful life of circuit breaker, i.e. the normal number of times of disjunction of circuit breaker, therefore, the user can't determine the remaining life of circuit breaker, therefore, in time replacing circuit breaker can't be in due course.
Second, for the above mentioned second way of observing to judge the mode of circuit breaker operating position by the user, obviously, electronic circuit breaker can't be integrated into user's observation situation and experience wherein, therefore, the electronic circuit breaker of prior art can't be realized the useful life of having lost of circuit breaker or the demonstration of remaining life based on the second manual type of judging the circuit breaker operating position at all.
In sum, expectation provides a kind of electronic trip unit with the function that shows the circuit breaker operating position, it can be accurately, convenient, provide the useful life of having lost of circuit breaker and the indication of remaining life to the user in time.
Summary of the invention
According to above-mentioned shortcoming and defect, the objective of the invention is to solve at least the above-mentioned problems in the prior art.
At first, notice, traditionally, have multiple expression mode the useful life of circuit breaker, for example, the number of times of service time, disjunction number of times, the electric current more than a certain threshold value of experience etc., correspondingly, traditional electronic trip unit shows these parameters (if having this function).Yet no matter the method for expressing at age of circuit breaker how, the inventor finds, what the user expected to know most is that the life-span of a circuit breaker is lost situation, in order in time change.Yet iff the above-mentioned parameter of knowing circuit breaker, this does not help the user to judge whether simply needs replacing circuit breaker, because, one, as explained above, in different electric circumstances, the specified useful life of circuit breaker is not identical, therefore, although the life-span that known circuit breaker has been lost, owing to can't accurately know specified useful life, therefore remaining life can't be accurately known, therefore the opportunity of changing circuit breaker can't be accurately known; Its two, even if one specified useful life of user oneself supposition judge thus and infer the opportunity that needs to change circuit breaker, this method is also directly perceived or directly, and is more inaccurate.
In order to solve this technical problem, according to the first embodiment of the present invention, a kind of electronic trip unit for circuit breaker is proposed, this electronic trip unit comprises display unit, wherein, the displaying contents of this display unit can show the current age value of described circuit breaker directly or indirectly, and wherein said current age value is the ratio in the specified useful life of the current useful life of having lost of circuit breaker and circuit breaker.Thus, the inventor proposes this concept of circuit breaker age first, and adopt one more than or equal to 0 and less than or equal to 1 ratio, the useful life of namely having lost and the ratio in specified useful life, characterize the age, thus, the user can judge whether to need to change circuit breaker very directly perceived, easy, effectively.For example, be 0% if electronic trip unit shows current age value, it is a brand-new circuit breaker that the user knows this circuit breaker; If it is 50% that electronic trip unit shows current age value, it is half new circuit breaker that the user knows this circuit breaker, and its useful life is just more than half; If it is 90% that electronic trip unit shows current age value, the user knows this circuit breaker and is about to reach the state of scrapping, and should be noted that timely replacing.
Further, for aforementioned the first embodiment, electronic trip unit can also comprise: default unit, should default unit be used for default circuit breaker and for the first time be communicated with the before initial age value of circuit breaker with electronic trip unit, to be circuit breaker be communicated with the ratio in the specified useful life of useful life of having lost before and circuit breaker for the first time with electronic trip unit to this initial age value; Implant the unit, this is implanted the unit and is used for implanting breaking current-age value increment conversion table, this conversion table represents that breaking current and circuit breaker experience the corresponding relation of the age value increment that this breaking current causes, wherein this age value increment be circuit breaker experience that this breaking current causes useful life the amount of losing with the ratio in the specified useful life of circuit breaker; Current value when record cell, this record cell are used for the each disjunction of record circuit breaker; Scaling unit, this scaling unit and described implantation unit be connected record cell and be connected, be used for when circuit breaker experience breaking current in described conversion table inquiry and the immediate breaking current value of current breaking current value of described recording unit records and corresponding age value increment thereof, and age value increment that should correspondence is defined as the age value increment that circuit breaker experiences the circuit breaker that current breaking current causes; Accumulated unit, this accumulated unit and described scaling unit be connected default unit and be connected, be used for the each age value increment of determining of the described scaling unit of accumulative total to obtain total age value increment of circuit breaker, and with the initial age value in the described default unit and this total age value increment addition, to obtain the current age value of circuit breaker; Output unit, this output unit is connected with described accumulated unit, is used for the current age value of output circuit breaker; Wherein, described output unit is connected with described display unit, and so that current age value is outputed to display unit, thereby so that display unit shows the current age value of described circuit breaker.
Further, for aforementioned the first embodiment, electronic trip unit also can also comprise: default unit, should default unit be used for default circuit breaker and for the first time be communicated with the before initial age value of circuit breaker with electronic trip unit, to be circuit breaker be communicated with the ratio in the specified useful life of useful life of having lost before and circuit breaker for the first time with electronic trip unit to this initial age value; Implant the unit, this is implanted the unit and is used for implanting breaking current-age value increment conversion table, this conversion table represents that breaking current and circuit breaker experience the corresponding relation of the age value increment that this breaking current causes, wherein this age value increment be circuit breaker experience that this breaking current causes useful life the amount of losing with the ratio in the specified useful life of circuit breaker; Current value when record cell, this record cell are used for the each disjunction of record circuit breaker; Scaling unit, this scaling unit and described implantation unit be connected record cell and be connected, be used for when circuit breaker experience breaking current in described conversion table inquiry and the immediate breaking current value of current breaking current value of described recording unit records and corresponding age value increment thereof, and age value increment that should correspondence is defined as the age value increment that circuit breaker experiences the circuit breaker that current breaking current causes; Accumulated unit, this accumulated unit and described scaling unit be connected default unit and be connected, be used for the each age value increment of determining of the described scaling unit of accumulative total to obtain total age value increment of circuit breaker, and with the initial age value in the described default unit and this total age value increment addition, to obtain the current age value of circuit breaker; Output unit, this output unit is connected with described accumulated unit, is used for the difference of output 1 and the current age value of circuit breaker, and this difference represents the ratio in the specified useful life of useful life of circuit breaker current residual and circuit breaker; Wherein, described output unit is connected with described display unit, so that this difference is outputed to display unit, so that display unit shows the ratio in the specified useful life of useful life of circuit breaker current residual and circuit breaker, thereby indirectly show the current age value of described circuit breaker.
Preferably, for previous embodiment, described breaking current-age value increment conversion table can be determined on the basis of experiment, if wherein brand-new circuit breaker reaches specified useful life after experiencing breaking current N time of a certain size in experiment, then the age value increment of breaking current that should size is defined as 1/N.Thus, will affect the circuit breaker key variables in useful life, namely breaking current was associated with the useful life of circuit breaker, and during the age that applies it to electronic circuit breaker determines and show, this is not think and or adopted in the prior art.In fact, for a long time, although people know the abrasion condition that mainly is limited by dynamic/static contact useful life of circuit breaker, yet, but these wearing and tearing are limited by many factors, for example, and the material of contact and quality; The welding quality of contact; The structure of contact system: for example, contact point, contact, striking method; Flow through the electric current of contact when cut-offfing; Be added in the voltage at contact two ends when cut-offfing; And the time of drop-out current etc.Therefore, although at electric field, the effective ways at a kind of age of the dynamic/static contact that can determine circuit breaker are found in for a long time always expectation, still, consider that it is relevant with above-mentioned factors, it is believed that, if correctly effectively determine the age of circuit breaker, need to pay suitable work and become original system or the device that designs a complexity, therefore, hang back, stop at this.Yet, on the other hand, surprisedly be that the inventor has found to solve the method for above-mentioned technical barrier through a large amount of and analysis and experiment.Particularly, the inventor finds, for a specific circuit breaker, other factors in the aforesaid factor that affects the dynamic/static contact electrical endurance except electric current is all determined, that is to say, for a specific circuit breaker, come into operation in case dispatch from the factory, its age is flow through the influence of peak current of dynamic/static contact when only being cut-off, namely its age is the function of electric current.And for each a circuit breaker, its physical parameter is basic identical before use, and for example, the material of contact and the welding quality of quality, contact, the structure of contact system, the time of drop-out current etc. all are to determine and identical.Therefore, in fact, the age of this circuit breaker only is limited by the electric circumstance of actual use, more specifically, only is limited by the situation of experience electric current in the actual use.Therefore, can be by experiment, determine that circuit breaker experiences the times N that reaches specified useful life behind the breaking current of a certain size, correspondingly, for experience once to breaking current that should size, its age value increment, the life-span of namely losing is 1/N.Carry out a series of experiment, then can determine a series of breaking currents and circuit breaker age growth the relationship between quantities, thereby can obtain breaking current-age value increment conversion table.Based on this, can design a kind of electronic trip unit, perhaps transform the electronic trip unit of circuit breaker in the prior art, so that this electronic trip unit can record the current conditions of dynamic/static contact, and based on breaking current-age value increment conversion table, process rationally converts, thereby determines the age of circuit breaker, and shows by the display unit of electronic trip unit.Thus, can solve the above-mentioned technical barrier of thirsting in the prior art solving always but failing all the time to succeed.
Preferably, for previous embodiment, breaking current-age value increment conversion table by the breaking current value that relates in the experiment and with it the age value increment of correspondence consist of, perhaps, according to the breaking current value that relates in the experiment and the age value increment of correspondence with it, obtain breaking current-age value increment relation curve by the mathematical method match, determine breaking current-age value increment conversion table according to this curve.
Preferably, for previous embodiment, electronic trip unit also can comprise alarm unit, and this alarm unit is connected with described output unit, be used for current age value during greater than predetermined threshold value to User Alarms.
Preferably, for previous embodiment, this electronic trip unit also can also comprise alarm unit, and this alarm unit is connected with described output unit, be used for described difference during less than predetermined threshold value to User Alarms.
Preferably, for previous embodiment, described alarm unit comprises acoustics warning device or optics warning device, perhaps comprises simultaneously acoustics warning device and optics warning device.
Preferably, for previous embodiment, one of the breaking current in the initial age value in the described default unit and the described implantation unit-age value increment conversion table or the two are set by manufacturer before product export, are perhaps arranged or editor by the user.Thus, electronic trip unit can Reusability.For example, after changing circuit breaker, after the circuit breaker and electronic trip unit that connect after changing, this electronic trip unit of can resetting, initial age value in the default unit of i.e. replacement if the circuit breaker of newly changing is brand-new, then is set as 0 with initial age value, if half is new and old, then initial age value can be set as 0.5 or 50%.Further, if the new circuit breaker of changing is not identical with the model of former circuit breaker, then can in implanting the unit, implant different corresponding breaking currents-age value increment conversion table, and then so that electronic trip unit can be served the circuit breaker of another model.
Preferably, for previous embodiment, the displaying contents of described display unit characterizes the current age value of circuit breaker with the form of color, mark, percentage, block diagram, pie chart or its combination.Certainly, different according to user's preference, age value can also have other display mode.
Will be appreciated that foregoing description only is for exemplary purpose, rather than will limit the scope of the invention.
Description of drawings
Above-mentioned and the further feature of exemplary embodiment of the present invention and advantage will become more obvious from following detailed description with the accompanying drawing, and this description and accompanying drawing only be used for illustrative purpose rather than limit the scope of the invention by any way, wherein:
Fig. 1 is the block diagram that the structure of electronic trip unit according to a preferred embodiment of the invention is shown;
Fig. 2 is the block diagram that illustrates according to the structure of the electronic trip unit of an embodiment of present invention further optimization.
Embodiment
Each exemplary embodiment of the present invention is described below with reference to accompanying drawings.
At first, need to prove, at this, term " age ", " age value " expression be a ratio, namely use the life-span amount of losing and ratio in specified useful life, unless opposite explanation or hint are arranged in addition.Adopt described ratio characterize circuit breaker use state also just the present invention to one of contribution of prior art.
Fig. 1 is the block diagram that the structure of electronic trip unit according to a preferred embodiment of the invention is shown.With reference to Fig. 1, electronic trip unit 1 comprises display unit 107, this display unit is used for showing the current age value of the circuit breaker that is communicated with electronic trip unit, and wherein said current age value is defined as the ratio in the specified useful life of the current useful life of having lost of circuit breaker and circuit breaker.Certainly, this display unit also can show the residue age of circuit breaker, namely 1 with the difference of the ratio in specified useful life of the current useful life of having lost of circuit breaker and circuit breaker.The two does not have substantive difference from inventive principle, how to show can User preference design.And the content that shows can be form and other form of color, mark, percentage, block diagram, pie chart or its combination.For example, preferably, the current age value of circuit breaker or residue age value can show by percentage, thus, are highly susceptible to the user and understand.Further, can also be aided with for example pie chart, current age value or residue age value are the part of having filled of pie chart, and remainder is blank.And filling part can also have different colours, to show intuitively the operating position of circuit breaker to the user.For example, then shown in green if the age of circuit breaker is 0-30%, represent a substantially brand-new circuit breaker, the user can relievedly use, and wouldn't consider to change matters; If the age of circuit breaker is 30-80%, then be shown as blueness, the circuit breaker that expression had been used and worked, the user can consider to change matters equally, but should give certain concern; If the age of circuit breaker is 80-100%, and is then shown in red, and can be aided with flicker, the expression circuit breaker approaches soon scraps state, and reminding user should in time be changed.
Continuation is with reference to Fig. 1, electronic trip unit 1 also comprises: default unit 101, the initial age value of circuit breaker before being used for default circuit breaker and electronic trip unit 1 being communicated with for the first time, initial age value definition circuit breaker and electronic trip unit 1 be first to be communicated with the ratio in the specified useful life of useful life of having lost before and circuit breaker; Implant unit 102, be used for implanting breaking current-age value increment conversion table, conversion table represents the corresponding relation of the age value increment that breaking current and circuit breaker experience breaking current causes, wherein the age value increment be defined as that circuit breaker experience breaking current causes useful life the amount of losing with the ratio in the specified useful life of circuit breaker; Record cell 103, the current value when being used for the each disjunction of record circuit breaker; Scaling unit 104, its with implant single 102 yuan and be connected with record cell and be connected, be used for the immediate breaking current value of current breaking current value that when circuit breaker experience breaking current, records at conversion table inquiry and record cell 103 and corresponding age value increment thereof, and the age value increment of correspondence is defined as the age value increment that circuit breaker experiences the circuit breaker that current breaking current causes; Accumulated unit 105, its with scaling unit 104 be connected unit 101 and be connected, be used for accumulative total scaling unit 104 each age value increments of determining to obtain total age value increment of circuit breaker, and will preset initial age value and total age value increment addition in the unit 101, to obtain the current age value of circuit breaker; Output unit 106, it is connected with accumulated unit 105, is used for the current age value of output circuit breaker.Wherein, output unit 106 is connected with display unit 107, and so that current age value is outputed to display unit 107, thereby so that display unit 107 shows the current age value of circuit breakers.
Alternatively, output unit 106 can export 1 with the difference of the current age value of circuit breaker, this difference represents the ratio in the specified useful life of useful life of circuit breaker current residual and circuit breaker, correspondingly, output unit 106 outputs to display unit 107 with this difference, so that the ratio in the specified useful life of the useful life of display unit 107 demonstration circuit breaker current residual and circuit breaker namely remains age value, thereby indirectly shows the current age value of described circuit breaker.
Should be noted that, according to electronic trip unit 1 of the present invention can not have default unit, implant the unit, record cell, scaling unit, accumulated unit, output unit whole, perhaps can have more functional unit, perhaps one or more in these unit can be integrated into a unit, and the annexation of these unit also can be different from shown in Figure 1, as long as it can realize recording the electric current of the each disjunction of circuit breaker, converting according to this electric current obtains the age value of circuit device, and this current value is outputed to display unit shows and get final product.
Further, those skilled in the art can be according to technology well known in the prior art, based on instruction of the present invention, implement above-mentioned each functional unit, therefore, for simplicity, do not provide explanation and explanation to the more detailed circuit structure of each functional unit at this.For example, for accumulated unit, obviously, the structure with electronic devices and components of accumulating function is known in this area, and the technical staff can carry out Choice and design as required.And, for existing electronic trip unit in the prior art, can under instruction of the present invention, easily transform, to realize having the electronic trip unit of circuit breaker age Presentation Function.
For above-described embodiment, one of key is breaking current-age value increment conversion table how to confirm.The circuit breaker of the K1 C1 160A of following Schneider company is that example is carried out respective description.
As previously mentioned, the weakest link of circuit breaker often is its contact, and namely the electrical endurance of contact is the shortest components/devices of life value in the circuit breaker, and it has determined the useful life of circuit breaker.Therefore, age of the contact of circuit breaker is set as the age of circuit breaker.What know in advance is, the operating voltage of the circuit breaker of above-mentioned model is 440V, and the contact wear of circuit breaker is when reaching 1mm, its electric property significantly descends, thereby should change circuit breaker, when namely contact wear reaches 1mm, circuit breaker reaches specified useful life, and whole life cycle stops.By experiment, determine when contact wear reaches 1mm, under the breaking current of same size, the number of times that circuit breaker can work, as shown in the table:
Table 1
| I(A) | 36000 | 1600 | 800 | 320 | 160 | 130 | 100 | 50 |
| N | 3 | 15 | 1000 | 4500 | 12000 | 20000 | 37000 | 60000 |
Wherein, I represents the breaking current size of dynamic/static contact experience, and N represents to reach fully circuit breaker experiences the electric current of a certain definite size during useful life number of times.For upper table, specifically, for example, experience 36000A electric current 3 times, circuit breaker reaches final useful life and can not continue to use; The electric current of experience 1600A 15 times, circuit breaker reaches final useful life and can not continue to use; The electric current of experience 50A 60000 times, circuit breaker reaches final useful life and can not continue to use.
Further, the age is 1 or 100% when setting circuit breaker and reaching final useful life, so, can determine, under the situation of a certain size of current, during by this electric current once, losing of its life-span is 1/N, and namely the age growth value of circuit breaker is 1/N.Based on table 1, can obtain following table 2:
Table 2
| I(A) | 36000 | 1600 | 800 | 320 | 160 | 130 | 100 | 50 |
| N | 3 | 15 | 1000 | 4500 | 12000 | 20000 | 37000 | 60000 |
| G | 0.333333 | 0.066667 | 0.001 | 0.000222 | 8.33E-05 | 5E-05 | 2.7E-05 | 1.67E-05 |
Wherein, G represents to experience the age growth value of primary current circuit breaker.For this table 2, for example, the electric current of a 36000A of every experience, the age growth 0.333333 of circuit breaker; And experience the electric current of a 50A, the age growth 1.67E-05 of circuit breaker.
Notice, for top table 1 and table 2, only provided representative size of current, but, those skilled in the art can more test and obtain number of times and the age growth situation that circuit breaker can stand under other size of current, can obtain thus breaking current-age value increment conversion table.In addition, also can obtain breaking current-age value increment relation curve by the mathematical method match according to the breaking current value that relates in the experiment and the age value increment of correspondence with it, determine breaking current-age value increment conversion table according to this curve.
When a breaking current of circuit breaker experience, scaling unit 104 can be inquired about this breaking current-age value increment conversion table, find and the immediate breaking current value of current breaking current value and corresponding age value increment thereof, and the age value increment of correspondence is defined as the age value increment that circuit breaker experiences the circuit breaker that current breaking current causes.For example, for upper table, if the electric current of a 700A of circuit breaker experience, question blank 2 learns therefore it is near 800A,, do following estimation: the electric current of 1000 700A of circuit breaker experience reaches useful life, the electric current of a 700A of every experience, circuit breaker age growth 0.001.Obviously, if the numerical value in the table is abundant, then may directly inquire the age value increment corresponding with the electric current of 700A, and needn't do above processing nearby.
Correspondingly, accumulated unit 105 accumulates once new age value increment on the basis of the value that preserved last time, thereby obtain experiencing the age of circuit breaker behind the last electric current, and by output unit, the current age value of circuit breaker is outputed to display unit shown.
What notice equally is, for top table 1 and 2, when current value was very little, its impact on the circuit breaker age was very little, for example, electric current for 100A, circuit breaker can stand 37000 times, the losing of electrical endurance of circuit breaker only is 2.7E-05, at this moment at every turn, for easy, the growth at age can be set as 0.Perhaps, preferably, more accurately, owing to be action 25000 times the mechanical endurance of the dynamic/static contact of circuit breaker, less than electrical endurance 37000 times, therefore, at this moment, the circuit breaker action once should be as the criterion with mechanical endurance on the impact in useful life, namely, electrical endurance also can be set as 25000 times, thereby obtain, the age growth of experience primary current circuit breaker is 1/25000.Accordingly, top table 2 can become
Table 3
| I(A) | 36000 | 1600 | 800 | 320 | 160 | 130 | 100 | 50 |
| N | 3 | 15 | 1000 | 4500 | 12000 | 20000 | 25000 | 25000 |
| G | 0.333333 | 0.066667 | 0.001 | 0.000222 | 8.33E-05 | 5E-05 | 4E-05 | 4E-05 |
Obviously, according to above-mentioned design and the method that provides of the present invention, can be determined by experiment arbitrary circuit breaker experience once the electric current of a certain size to the situation of losing in its life-span, i.e. age growth amount.In other words, can obtain being similar to the breaking current of top table 3-age value increment conversion table.Therefore, current value in the time of can recording the each disjunction of circuit breaker by means of electronic trip unit, and by calling for example breaking current of type as shown in table 3-age value increment conversion table, obtain the age growth value of circuit breaker under every primary current, and obtain the current age value of circuit breaker by each age growth value of accumulated unit accumulative total, then by display unit for example light-emitting diode display show in real time, thereby the technical staff can easily be known by observing display unit the age of circuit breaker, and take corresponding necessary measure, if necessary.
Fig. 2 is the block diagram that illustrates according to the structure of the electronic trip unit of an embodiment of present invention further optimization.With reference to Fig. 2, wherein the unit identical with embodiment shown in Figure 1 represents with identical Reference numeral.Electronic trip unit 1 can also comprise alarm unit 108, and it is connected with described output unit 106.Output unit is not only exported to display unit 107 with the current age value of circuit breaker or residue age value, also outputs it to alarm unit 108.When output valve surpasses the predetermined threshold value of alarm unit, report to the police.Especially, if output valve is current age value, then when current age value during greater than predetermined threshold value to User Alarms; If output valve is starved when remaining age value less than predetermined threshold value to User Alarms for the residue age value.Alarm unit 108 can comprise for example buzzer or optics warning device flashing lamp for example of acoustics warning device, perhaps comprises simultaneously acoustics warning device and optics warning device.For the threshold value of current age value, for example, for example can be set as 80%, correspondingly, the threshold value for the residue age value for example, can be set as 20%.
For the preferred embodiment shown in Fig. 1 or 2, initial age value default in the default unit 101 can be set by manufacturer before product export, for example is fixed as 0, and the circuit breaker that its supposition is connected with electronic trip unit is brand-new.Breaking current in the implantation unit 102-age value increment conversion table also can be set by manufacturer before product export.Manufacturer can utilize the easily above-mentioned instruction according to the present invention of its human and material resources advantage to obtain the breaking current of the circuit breaker of a certain model-age value increment conversion table, and this table is installed in the implantation unit to the electronic trip unit of circuit breaker that should model.
On the other hand, in order to expand the scope of application of electronic trip unit, one of default unit and implantation unit or the two can for open, namely can be arranged or editor by the user.For example, when connecting electronic release and circuit breaker, the user can according to the operating position of circuit breaker, set its initial age value.Especially, can preset by pressing the RESET key, for example, first presses RESET, and initial age value is set to 0, whenever clicks later on RESET, and initial age value arranges and increases by 5%, that is, two times is 10%, three time 15%, by that analogy.After pressing RESET, whole electronic trip unit resets again.Moreover, when circuit breaker is replaced by the circuit breaker of different model, can be by implanting the new breaking current to the circuit breaker after should changing-age value increment conversion table, thereby so that the primary electron release stand good.
Further, the user can on breaking current that manufacturer provides-age value increment conversion table basis, finely tune according to actual use experience, thereby so that electronic trip unit be more accurate.
Although on the basis with reference to each embodiment, the present invention is described in specification and is illustrated in the accompanying drawings, but it will be appreciated by those skilled in the art that, above-described embodiment only is preferred embodiment, some technical characterictic among the embodiment may not be essential for solving specific technical problem, thereby can not have or omit these technical characterictics and the formation of non-influence technique solution of problem or technical scheme; And, the feature of an embodiment, key element and/or function can with the suitably mutually combination of feature, key element and/or the function of other one or more embodiment, in conjunction with or cooperates, unless this combination, combination or cooperation obviously can not be implemented.
Claims (10)
1. electronic trip unit that is used for circuit breaker, it is characterized in that, this electronic trip unit comprises display unit, the displaying contents of this display unit can show the current age value of described circuit breaker directly or indirectly, and wherein said current age value is the ratio in the specified useful life of the current useful life of having lost of circuit breaker and circuit breaker.
2. electronic trip unit as claimed in claim 1 is characterized in that, this electronic trip unit also comprises:
Default unit, should default unit be used for default circuit breaker and for the first time be communicated with the before initial age value of circuit breaker with electronic trip unit, to be circuit breaker be communicated with the ratio in the specified useful life of useful life of having lost before and circuit breaker for the first time with electronic trip unit to this initial age value;
Implant the unit, this is implanted the unit and is used for implanting breaking current-age value increment conversion table, this conversion table represents that breaking current and circuit breaker experience the corresponding relation of the age value increment that this breaking current causes, wherein this age value increment be circuit breaker experience that this breaking current causes useful life the amount of losing with the ratio in the specified useful life of circuit breaker;
Current value when record cell, this record cell are used for the each disjunction of record circuit breaker;
Scaling unit, this scaling unit and described implantation unit be connected record cell and be connected, be used for when circuit breaker experience breaking current in described conversion table inquiry and the immediate breaking current value of current breaking current value of described recording unit records and corresponding age value increment thereof, and age value increment that should correspondence is defined as the age value increment that circuit breaker experiences the circuit breaker that current breaking current causes;
Accumulated unit, this accumulated unit and described scaling unit be connected default unit and be connected, be used for the each age value increment of determining of the described scaling unit of accumulative total to obtain total age value increment of circuit breaker, and with the initial age value in the described default unit and this total age value increment addition, to obtain the current age value of circuit breaker;
Output unit, this output unit is connected with described accumulated unit, is used for the current age value of output circuit breaker;
Wherein, described output unit is connected with described display unit, and so that current age value is outputed to display unit, thereby so that display unit shows the current age value of described circuit breaker.
3. electronic trip unit as claimed in claim 1 is characterized in that, this electronic trip unit also comprises:
Default unit, should default unit be used for default circuit breaker and for the first time be communicated with the before initial age value of circuit breaker with electronic trip unit, to be circuit breaker be communicated with the ratio in the specified useful life of useful life of having lost before and circuit breaker for the first time with electronic trip unit to this initial age value;
Implant the unit, this is implanted the unit and is used for implanting breaking current-age value increment conversion table, this conversion table represents that breaking current and circuit breaker experience the corresponding relation of the age value increment that this breaking current causes, wherein this age value increment be circuit breaker experience that this breaking current causes useful life the amount of losing with the ratio in the specified useful life of circuit breaker;
Current value when record cell, this record cell are used for the each disjunction of record circuit breaker;
Scaling unit, this scaling unit and described implantation unit be connected record cell and be connected, be used for when circuit breaker experience breaking current in described conversion table inquiry and the immediate breaking current value of current breaking current value of described recording unit records and corresponding age value increment thereof, and age value increment that should correspondence is defined as the age value increment that circuit breaker experiences the circuit breaker that current breaking current causes;
Accumulated unit, this accumulated unit and described scaling unit be connected default unit and be connected, be used for the each age value increment of determining of the described scaling unit of accumulative total to obtain total age value increment of circuit breaker, and with the initial age value in the described default unit and this total age value increment addition, to obtain the current age value of circuit breaker;
Output unit, this output unit is connected with described accumulated unit, is used for the difference of output 1 and the current age value of circuit breaker, and this difference represents the ratio in the specified useful life of useful life of circuit breaker current residual and circuit breaker;
Wherein, described output unit is connected with described display unit, so that this difference is outputed to display unit, so that display unit shows the ratio in the specified useful life of useful life of circuit breaker current residual and circuit breaker, thereby indirectly show the current age value of described circuit breaker.
4. electronic trip unit as claimed in claim 2 or claim 3, it is characterized in that, described breaking current-age value increment conversion table is determined on the basis of experiment, if wherein brand-new circuit breaker reaches specified useful life after experiencing breaking current N time of a certain size in experiment, then the age value increment of breaking current that should size is defined as 1/N.
5. electronic trip unit as claimed in claim 4, it is characterized in that, breaking current-age value increment conversion table by the breaking current value that relates in the experiment and with it the age value increment of correspondence consist of, perhaps, according to the breaking current value that relates in the experiment and the age value increment of correspondence with it, obtain breaking current-age value increment relation curve by the mathematical method match, determine breaking current-age value increment conversion table according to this curve.
6. electronic trip unit as claimed in claim 2 is characterized in that, this electronic trip unit also comprises alarm unit, and this alarm unit is connected with described output unit, be used for current age value during greater than predetermined threshold value to User Alarms.
7. electronic trip unit as claimed in claim 3 is characterized in that, this electronic trip unit also comprises alarm unit, and this alarm unit is connected with described output unit, be used for described difference during less than predetermined threshold value to User Alarms.
8. such as claim 6 or 7 described electronic trip units, it is characterized in that described alarm unit comprises acoustics warning device or optics warning device, perhaps comprise simultaneously acoustics warning device and optics warning device.
9. electronic trip unit as claimed in claim 2 or claim 3, it is characterized in that, one of breaking current in initial age value in the described default unit and the described implantation unit-age value increment conversion table or the two are set by manufacturer before product export, are perhaps arranged or editor by the user.
10. such as the described electronic trip unit of one of claim 1-3, it is characterized in that the displaying contents of described display unit characterizes the current age value of circuit breaker with the form of color, mark, percentage, block diagram, pie chart or its combination.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110223181.0A CN102915883B (en) | 2011-08-05 | 2011-08-05 | Electronic tripper |
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|---|---|---|---|
| CN201110223181.0A CN102915883B (en) | 2011-08-05 | 2011-08-05 | Electronic tripper |
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| CN102915883A true CN102915883A (en) | 2013-02-06 |
| CN102915883B CN102915883B (en) | 2015-04-22 |
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| CN201110223181.0A Active CN102915883B (en) | 2011-08-05 | 2011-08-05 | Electronic tripper |
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Cited By (1)
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| CN103389461A (en) * | 2013-07-25 | 2013-11-13 | 德力西电气有限公司 | Breaker electronic release with breaker service life detection function |
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| CN102915883B (en) | 2015-04-22 |
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