CN101714749B - Electronic circuit breaker - Google Patents
Electronic circuit breaker Download PDFInfo
- Publication number
- CN101714749B CN101714749B CN 200910118671 CN200910118671A CN101714749B CN 101714749 B CN101714749 B CN 101714749B CN 200910118671 CN200910118671 CN 200910118671 CN 200910118671 A CN200910118671 A CN 200910118671A CN 101714749 B CN101714749 B CN 101714749B
- Authority
- CN
- China
- Prior art keywords
- current
- maximum
- electric current
- characteristic
- load
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The present invention provides an electronic circuit breaker, capable of obtaining fluctuation status of a load current in an overcurrent area without an additional measuring device so as to set overcurrent tripping characteristics easily. The electronic circuit breaker comprises switch contact points used to switch on/off a circuit; a tripping device used to switch off the switch contact points; a current detection circuit used to detect the current of a circuit; a characteristics setting part used to set the overcurrent tripping characteristics for switching off the switch contact points corresponding to the overcurrent flowing across the circuit; and a control device used to output a tripping signal to the tripping device according to the overcurrent tripping characteristics and the detection current detected by the current detection circuit. The electronic circuit breaker also comprises a on-time measuring part used to time the on-time corresponding to the detection current; and a most on-time storage part used to store a most on-time measured by the on-time measuring part corresponding to the detection current.
Description
Technical field
The present invention relates to a kind of electronic circuit breaker, the load current of circuit is flow through in its detection, when the overcurrent zone, according to selectivity characteristic circuit is carried out open circuit protection.
Background technology
Existing electronic circuit breaker, can be according to the behaviour in service of connection state and the load equipment of the load equipment that is connected with load side electrical circuitry, and after being set, circuit-breaker sets overcurrent trip characteristic (for example, with reference to patent documentation 1 Fig. 1).
Patent documentation 1: JP 2001-128354 communique
Summary of the invention
In the existing electronic circuit breaker shown in above-mentioned, owing to can set the overcurrent trip characteristic according to the behaviour in service of load equipment, therefore can be arranged in the following circuit, namely, after this circuit-breaker was set, the expectation meeting was owing to such as the circuit that appends the operational mode that connects load equipment or change load equipment etc. and make the load current change.
But, in the situation that is connected with a plurality of load equipments as motor in the load side electrical circuitry, if because according to operational mode while or time-delay operation, then the starting current by motor causes the larger change of the instantaneous generation of load current, therefore in order to hold the upset condition of setting the load current in the necessary overcurrent of the overcurrent trip characteristic zone, need in addition measurement mechanism be set and the upset condition of load current be measured the setting difficult of overcurrent trip characteristic.
The present invention proposes in order to address the above problem, its purpose is to provide a kind of electronic circuit breaker, it need not to arrange in addition measurement mechanism and just can hold the upset condition of the load current in the overcurrent zone, thereby easily sets the overcurrent trip characteristic.
Electronic circuit breaker of the present invention has: make and break contact, and it makes the circuit on/off; Tripgear, it disconnects this make and break contact; Current detecting unit, the electric current in its testing circuit; Overcurrent trip property settings section, it is set and is used for corresponding with the overcurrent that flows through circuit and overcurrent trip characteristic that make and break contact is disconnected; And control device, it is based on the overcurrent trip characteristic with by the detected detection electric current of current detecting unit, to tripgear output trip signal, the characteristic of this electronic circuit breaker is to have: conduction time measurement section, it carries out timing to the energising duration corresponding with detecting electric current; And maximum conduction time storage part, its storage by this conduction time measurement section with to detect electric current corresponding and maximum that measure is switched on the duration.
The effect of invention
According to the present invention, by the corresponding maximum energising duration of measuring with the load current that flows through circuit is measured, can hold the variation of the load current in the overcurrent zone, thereby can easily set the overcurrent trip characteristic.
Description of drawings
Fig. 1 is the block diagram of the structure of the electronic circuit breaker in the expression embodiments of the present invention 1.
Fig. 2 is the key diagram of the method for the effective value that obtains electric current by sampling of the electronic circuit breaker in the embodiments of the present invention 1.
Fig. 3 is the figure of the displaying contents that shows in the display part of the electronic circuit breaker of expression in the embodiments of the present invention 1.
Fig. 4 is the flow chart of the action of the electronic circuit breaker in the expression embodiments of the present invention 1.
Fig. 5 is the block diagram of the structure of the electronic circuit breaker in the expression embodiments of the present invention 2.
Fig. 6 is the key diagram of the relation of the maximum load selectivity characteristic of the electronic circuit breaker of expression in the embodiments of the present invention 2 and overcurrent trip characteristic.
Fig. 7 is the flow chart of the action of the electronic circuit breaker in the expression embodiments of the present invention 2.
Fig. 8 is the flow chart of the action of the electronic circuit breaker in the expression embodiments of the present invention 3.
Fig. 9 is the key diagram of the method for the effective value that obtains load current by sampling of the electronic circuit breaker in the embodiments of the present invention 4.
Figure 10 is the flow chart of the action of the electronic circuit breaker in the expression embodiments of the present invention 4.
Embodiment
Fig. 1 is the block diagram of the structure of the electronic circuit breaker in the expression embodiments of the present invention 1, Fig. 2 is the key diagram of method that obtains the effective value of electric current by sampling, Fig. 3 is the figure of the displaying contents that shows in the display part of expression, and Fig. 4 is the flow chart of the action of expression electronic circuit breaker.
In Fig. 1, electronic circuit breaker 100 has following parts and consists of: make and break contact 2, and it makes alternating current circuit 1 on/off; Current transformer 3, it is arranged on the alternating current circuit 1, exports the current signal that is directly proportional with the load current that flows through alternating current circuit 1; Current detection circuit 4, its current output signal with this current transformer 3 is transformed to analog voltage signal; A/D translation circuit 5, it will be transformed to digital signal from the analog voltage signal of current detection circuit 4; Load current operational part 6, it is according to from the digital signal of this A/D translation circuit 5, the current value that each of computing alternating current circuit 1 flows through in mutually; Property settings section 7, it sets the overcurrent trip characteristic that is made of the relation between trip time and the load current value, and rated current; Control device 8, it comprises microcomputer (CPU), according to the current value that overcurrent trip characteristic and load current operational part 6 by these property settings section 7 settings calculate, output overcurrent trip signal; Trip circuit 9, it disconnects make and break contact 2 according to the trip signal from this control device 8; Conduction time, measurement section 10, and it carries out timing to the time that the load current value Continuous-flow of the alternating current circuit 1 that calculated by load current operational part 6 is crossed; And maximum conduction time storage part 11, its storage by this conduction time measurement section 10 corresponding with each load current value and maximum that measure is switched on the duration.
In addition, be connected with at control device 8: display part 12 is display unit, it as shown in Figure 3, show overcurrent trip characteristic curve 20 and maximum load selectivity characteristic curve 21, this overcurrent trip characteristic curve 20 demonstrates the overcurrent trip characteristic of being set by property settings section 7 with figure, and this maximum load selectivity characteristic curve 21 utilizes such as curves etc. and demonstrates the maximum energising duration and the relation between each load current value that are stored in maximum conduction time of the storage part 11, is the maximum load selectivity characteristic with figure; And communication interface (communication I/F) 13 is communication unit, its data that are used for the overcurrent trip characteristic that will be set by property settings section 7 and maximum load selectivity characteristic are to sending such as external equipments such as exterior display devices, and the setting that receives the overcurrent trip characteristic.Display part 12 is by consisting of such as liquid crystal indicator etc.
Current detection circuit 4 has following parts and consists of: rectification circuit 4a, and it will be transformed to from the alternating current output signal of current transformer 3 direct current signal; Load circuit 4b, its output current signal with rectification circuit 4a is transformed to voltage signal; And waveform transformation circuit 4c, it is used for obtaining the effective value of the output voltage signal that load circuit 4b produces.And, consist of current detecting unit by this current detection circuit 4, current transformer 3 and A/D translation circuit 5.
In addition, the load-side of electronic circuit breaker 100 is connected with a plurality of load 14a, 14b such as motor or electric light.
According to Fig. 2, the operation method of the load current of load current operational part 6 is described.The electric current of detected alternating current circuit 1 is transformed to digital value by A/D translation circuit 5 from the analogue value.The sense cycle of this current signal, be to be Δ t in the sampling period.Because load current need to obtain effective value, so be in the situation of for example 50Hz for during suitable with 5 cycles at the ac power frequency of alternating current circuit 1, for during suitable with 6 cycles, carry out the second order rolling average with hits m in the situation of 60Hz, obtain I
2=(∑ i
2)/m is as the square value of the effective value of sample rate current.I
2Square root be the effective value I of load current.
Demonstration in the display part 12 as shown in Figure 3, transverse axis is made as load current value, the longitudinal axis is made as the operate time of circuit-breaker 100, show overcurrent trip characteristic curve 20 and the maximum load selectivity characteristic curve 21 set by property settings section 7 in same display frame, this maximum load selectivity characteristic curve 21 demonstrates the data that are made of the maximum energising duration relative with each load current value that is stored in maximum storage part conduction time 11 with figure.If the load current value of the alternating current circuit 1 that is calculated by load current operational part 6 surpasses the boundary line of overcurrent trip characteristic 20, then the 9 output trip signals from control device 8 to trip circuit disconnect make and break contact 2.
In addition, as displaying contents, the numerical value of the duration of also maximum corresponding with each load current value of maximum load selectivity characteristic 21 can being switched on gathers and shows.
Below, action is described.
According to the flow chart of Fig. 4, centered by the action of control device 8, describe.Because in handling process, have data T1 conduction time, therefore in initial treatment with data T1 zero clearing (step 30).Obtain load current value I1 (step 31) by load current operational part 6, based on this load current value I1, carry out the overcurrent trip time limit and process (step 32), compare (step 33) with the overcurrent trip characteristic of being set by property settings section 7, overcurrent trip characteristic 20 for example shown in Figure 3, the boundary line that surpasses overcurrent trip characteristic 20 at load current value I1, carry out in the situation of overcurrent trip action, the 9 output trip signals from control device 8 to trip circuit, the action (step 42) of opening circuit of executive circuit circuit breaker.
, do not carry out in the situation of overcurrent trip action above the boundary line of overcurrent trip characteristic 20 at load current value I1, whether the load current value I1 that judgement calculates with respect to the load current value of last time variation (step 34) has occured.When load current value I1 does not change, time till energising adds in the duration T 1 from the calculation process of the load current operational part 6 of last time to this processing is through excessive Δ t, the time that obtains is made as energising duration T 1=T1+ Δ t, upgrades the energising duration (step 35).Load current value I 1 with respect on sub-value when variation has occured, the duration T of will switching on 1 is made as the time through excessive Δ t, upgrades the energising duration (step 36).
Then, from maximum storage part conduction time 11, read the maximum energising duration T max (I1) (step 37) in the past relative with load current value I1, current energising duration T 1 and the energising duration T max of maximum in the past (I1) that will be relative with load current value I1 compare (step 38), surpass the maximum energising in past during the duration in the energising duration of current load current value, upgraded (Tmax (I1)=T1) (step 39), maximum energising duration T max (I1) that will be relative with load current value are stored in maximum conduction time of the storage part 11 (step 40) maximum in the past energising duration.Demonstration data as the maximum load selectivity characteristic of exporting to display part 12, read the maximum energising duration value relative with each load current value that is stored in maximum storage part conduction time 11, show maximum load selectivity characteristic curve 21 (steps 41) according to load current value and maximum energising duration thereof.Then, carry out the computing (step 31) of new load current value.
According to present embodiment, because have maximum conduction time of storage part 11, its storage is corresponding with each the load current value I1 that flows through alternating current circuit 1 and by the maximum that conduction time, measurement section 10 the was measured duration T max (I1) that switches on, thereby can hold the load current in the overcurrent zone that the run action by a plurality of load equipments that are connected with alternating current circuit 1 causes variation, be the maximum load selectivity characteristic, so can easily set the overcurrent trip characteristic.
In addition, because maximum load selectivity characteristic curve 21 and overcurrent trip characteristic curve 20 are presented in the display part 12 together, so can more easily set the overcurrent trip characteristic.
In addition, owing to have communication interface 13, it receives/sends for each data and the external equipment that will consist of maximum load selectivity characteristic and overcurrent trip characteristic, therefore also can easily set the overcurrent trip characteristic from long-range.
In addition, in the present embodiment, constitute will be corresponding with each load current value I1 the maximum energising duration as the maximum load selectivity characteristic, but also can constitute, each load current value is for example replaced with percent value with respect to the circuit-breaker rated current, by load current value is divided into more than or equal to 100% less than 200%, more than or equal to 200% less than 300% scope, so that the amount minimizing of the data that consisted of by the scope of each load current value and the maximum energising duration relative with it.
Fig. 5 is the block diagram of the structure of the electronic circuit breaker 101 in the expression embodiments of the present invention 2, Fig. 6 is the key diagram of relation of maximum load selectivity characteristic and the overcurrent trip characteristic of expression electronic circuit breaker 101, and Fig. 7 is the flow chart that represents the action of electronic circuit breaker 101.
In execution mode 1, although can easily hold the change of load current value, but since actual overcurrent trip characteristic with the maximum load selectivity characteristic be different from computational methods time correlation, so do not mate between overcurrent trip characteristic and the maximum load selectivity characteristic.In the present embodiment, reflect heat resume in the maximum load selectivity characteristic, as shown in Figure 5, electronic circuit breaker 101 does not have measurement section 10 conduction time.Other structure is because identical with execution mode 1, and therefore description thereof is omitted.
The overcurrent trip characteristic of electronic circuit breaker 101 according to the size of load current, is made of long characteristic in limited time, short each overcurrent trip characteristic curve of prescribing a time limit characteristic and temporal properties as shown in Figure 6.In the present embodiment, especially the action in the zone of long characteristic is in limited time described.Long characteristic is in limited time set by property settings section 7 in advance, for example will grow tripping operation Te operate time in limited time and be set as Te=K/Ie
2Here, Ie is load current value, and Te is long tripping operation operate time in limited time, and K is constant.In addition, K is by the line segment 0-Ie of Fig. 6, reaches the rectangular area S0 that line segment 0-Te surrounds, and, is equivalent to S0=K=Te * Ie that is
2
The action of electronic circuit breaker 101 is, with effective value Ie and the predetermined rated current I of load current
0Compare, judge whether Ie surpasses I
0At this moment, in order to simplify processing, also can be with the square value Ie of load current effective value
2Square value I with rated current
0 2Compare.Surpass in the situation of rated current, by accumulation of electrical current meter unit, with the square value Ie of load current effective value at the load current effective value
2Multiply by sampling period Δ t and come operation current long-pending, accumulate and computing accumulated current value S1 this electric current is long-pending simultaneously.This accumulated current value S1 is S1=∑ (Δ t * Ie
2), in the moment of this accumulated current value S1 above area S0, electronic circuit breaker 101 is carried out the action of opening circuit.
Be less than or equal at the load current effective value in the situation of rated current, from accumulated current value S1, deduct and cool off suitable hot resume Δ tP by the residual current correcting unit.Here, P is constant, is the coefficient of heat transfer in the unit interval.
Here, as the maximum load selectivity characteristic, if load current value Ie flow through continuous conduction time of T1 during, then accumulated current value S1 becomes the rectangular area that line segment 0-Ie and line segment 0-T1 surround, and can be expressed as S1=Ie
2T1.
In addition, at load current value from Ie change in the situation of I1, by accumulation of electrical current meter unit, the accumulated current value S2 during according to the last time computing and this detected load current I1 are according to S 1=S2+ Δ t * I1
2Come computing accumulated current value S1.Then, by load current time limit scaling unit according to T2=S1/I1
2Come the energising duration T 2 of computing load electric current I 1, in the T2 situation larger than the maximum energising duration corresponding with the load current I1 in past, be stored in maximum conduction time of the storage part 11 as the new maximum energising duration.In addition, as the maximum load selectivity characteristic relative with load current I1, can obtain and the length of electronic circuit breaker 101 characteristic that overcurrent trip action under the characteristic conforms to of prescribing a time limit.
Below, action is described.
Action according to the flowchart text control device 8 of Fig. 7.Because step 30,31,37～42 identical with execution mode 1 is so description thereof is omitted.At first, obtain load current I 1 (step 31) by load current operational part 6, with itself and rated current I
0Compare, judge whether load current value is in overcurrent condition (step 50).
At I1＞I
0Be that load current I1 surpasses rated current I
0The time, process as long tripping operation in limited time, by accumulation of electrical current meter unit according to S 1=S2+ (Δ t * I1
2) calculate accumulated current value S1 (step 51), wherein, this accumulated current value S1 obtains long-pending accumulative total of the electric current in the elapsed time.Here, the accumulated current value S1 when S2 is last computation, initial value are zero.
Then, compare (step 52) with the constant K of regulation, this constant K is to calculate according to the set point of tripping characteristic of being prescribed a time limit by property settings section 7 predefined length, and in the situation of S1＞K, electronic circuit breaker 101 is carried out the action (step 42) of opening circuit.
In the situation of S1≤K, in order to be that accumulated current value S1 in the elapsed time is scaled the energising duration value T1 relative with current load current value I1 with hot resume, be transferred to the conversion of load current time limit and process, by load current time limit scaling unit computing T1=S1/I1
2, obtain the energising duration value T1 (step 53) relative with load current value I1.
Then, read the maximum energising duration T max (I1) (step 37) in the past relative with load current value I1 from maximum storage part conduction time 11, current energising duration T 1 and the energising duration T max of maximum in the past (I1) that will be relative with load current value I1 compare (step 38).The energising duration T 1 of load current value I1 at this surpasses in the situation of maximum energising duration T max (I1) in the past, the maximum in past energising duration T max (I1) upgraded (Tmax (I1)=T1) (step 39), maximum energising duration T max (I1) that will be relative with load current value I1 are stored in maximum conduction time of the storage part 11 (step 40).
Then, as the demonstration data that are used for showing at display part 12 the maximum load selectivity characteristic, read the maximum energising duration relative with each load current value that is stored in maximum storage part conduction time 11, will be presented in the display part 12 (step 41) by the maximum load selectivity characteristic 21 that each load current value and maximum energising duration thereof form.Then, carry out the computing (step 31) of new load current value.
In addition, be less than or equal in the situation of maximum energising duration T max (I1) in the past in this energising duration T 1 of load current value I1, do not carry out maximum conduction time of storage part 11 renewal and process.
In addition, judge whether load current value is in overcurrent condition (step 50), at I1≤I
0State be that load current value I1 is less than or equal to rated current I
0The time, be transferred to long-pending correction of residual current and process.Process as long-pending correction of residual current, calculate heat radiation correction value delta tP by the long-pending correcting unit of residual current, this heat radiation corrected value with process load current value I1 less than rated current I since last time
0Duration of state be directly proportional, deduct heat radiation correction value delta tP, the accumulated current value S1 (step 54) behind the calculation correction the hot resume of within the elapsed time of past when surpassing the overcurrent condition of rated current, accumulating and obtaining, the accumulated current value S2.In addition, P is constant, is the coefficient of heat transfer in the unit interval, and the long-pending correction of residual current is processed corresponding with the cooling of alternating current circuit 1.
Judge whether accumulated current value S1 is S1＜0 (step 55), in the situation that becomes S1＜0, accumulated current value to this and last time is carried out initialization, namely is set as S1=S2=0 (step 56), is transferred to the load current time limit to convert and process (step 53).In the situation of S1 〉=0, directly be transferred to the conversion of load current time limit and process (step 53).
According to present embodiment, owing to have maximum conduction time of storage part 11, its storage is corresponding with each the load current value I1 that flows through alternating current circuit 1 and by the maximum that conduction time, measurement section 10 the was measured duration T max (I1) that switches on, thereby the variation that can hold the load current in the overcurrent zone that the run action by a plurality of load equipments that are connected with alternating current circuit 1 causes is the maximum load selectivity characteristic, so can easily set the overcurrent trip characteristic.
In addition, hot resume have been considered in the computational methods by the duration of switching in the maximum corresponding with each load current value of maximum load selectivity characteristic, thereby can obtain the maximum load selectivity characteristic 21 that is complementary with the overcurrent trip action that comprises hot resume of electronic circuit breaker 101, can set exactly the overcurrent trip characteristic.
In addition, because maximum load selectivity characteristic curve 21 and overcurrent trip characteristic curve 20 are presented in the display part 12 together, so can more easily set the overcurrent trip characteristic.
In addition, owing to have communication interface 13, it receives/sends for each data and the external equipment that will consist of maximum load selectivity characteristic and overcurrent trip characteristic, therefore also can easily set the overcurrent trip characteristic from long-range.
In addition, in the present embodiment, only put down in writing the long situation of characteristic in limited time, but for the situation of short characteristic in limited time and temporal properties, also can make the computational methods of maximum energising duration of maximum load selectivity characteristic 21 identical with the method for each overcurrent trip processing.
In addition, constitute will be corresponding with each load current value I1 the maximum energising duration as the maximum load selectivity characteristic, but also can constitute, each load current value is for example replaced with percent value with respect to the circuit-breaker rated current, by load current value is divided into more than or equal to 100% less than 200%, more than or equal to 200% less than 300% scope, and so that the amount minimizing of the data that consisted of by the scope of each load current value and the maximum energising duration relative with it.
Execution mode 3
Fig. 8 is the flow chart of the action of the electronic circuit breaker 102 in the expression embodiments of the present invention 3.The block diagram of the structure of expression electronic circuit breaker 102 is identical with Fig. 1.In the present embodiment, in the basis of execution mode 2 interpolation measurement section conduction time 10, when load current value is less than or equal to rated current, with execution mode 1 in the same manner, do not have the reflect heat resume during duration in the maximum energising of calculating the maximum load selectivity characteristic.Other structure and action are because identical with execution mode 2, and therefore description thereof is omitted.
Below, action is described.
Action according to the flowchart text control device 8 of Fig. 8. Step 30,31,37～56 identical with execution mode 2.At first, obtain load current I1 (step 31) by load current operational part 6, with itself and rated current I
0Compare, judge whether load current value is in overcurrent condition (step 50).
At I1＞I
0Be that load current I1 surpasses rated current I
0The time, overcurrent sign F is set to opens (step 60).Then, process as long tripping operation in limited time, by accumulation of electrical current meter unit according to S1=S2+ (Δ t * I1
2) calculate accumulated current value S1 (step 51), wherein, this accumulated current value S1 obtains long-pending accumulative total of the electric current in the elapsed time.Here, the accumulated current value S1 when S2 is last computation, initial value are zero.
Then, compare (step 52) with the constant K of regulation, this constant K is to calculate according to the set point of tripping characteristic of being prescribed a time limit by property settings section 7 predefined length, and in the situation of S1＞K, electronic circuit breaker 102 is carried out the action (step 42) of opening circuit.
In the situation of S1＜K, in order to be that accumulated current value S1 in the elapsed time is scaled the energising duration value T1 relative with current load current value I1 with hot resume, and by load current time limit scaling unit computing T1=S1/I1
2, obtain the energising duration value T1 (step 53) relative with load current value I1.
Then, read the maximum energising duration T max (I1) (step 37) in the past relative with load current value I1 from maximum storage part conduction time 11, current energising duration T 1 and the energising duration T max of maximum in the past (I1) that will be relative with load current value I1 compare (step 38).The energising duration T 1 of load current value I1 at this surpasses in the situation of maximum energising duration T max (I1) in the past, the maximum in past energising duration T max (I1) upgraded (Tmax (I1)=T1) (step 39), maximum energising duration T max (I1) that will be relative with load current value are stored in maximum conduction time of the storage part 11 (step 40).
Then, as the demonstration data that are used for showing at display part 12 the maximum load selectivity characteristic, read the maximum energising duration relative with each load current value that is stored in maximum storage part conduction time 11, in display part 12, show maximum load selectivity characteristic curve 21 (steps 41) according to load current value and maximum energising duration thereof.Then, carry out the computing (step 31) of new load current value.
In addition, be less than or equal in the situation of maximum energising duration T max (I1) in the past in this energising duration T 1 of load current value I1, do not carry out maximum conduction time of storage part 11 renewal and process.
In addition, judge that whether load current value is in overcurrent condition (step 50), is being in I1≤I
0State be that load current value I1 is less than or equal to rated current I
0The time, confirm overcurrent sign F whether for opening (step 61), when opening (F=1), be transferred to that residual current is long-pending proofreaies and correct processing at overcurrent sign F., do not carry out long-pending correction of residual current and process when closing (F=0) at overcurrent sign F, timing conduction time that is transferred to is thereafter processed.
, be transferred to long-pending correction of residual current and process for to open in the situation of (F=1) at overcurrent sign F.Process as long-pending correction of residual current, calculate heat radiation correction value delta tP by the long-pending correcting unit of residual current, this heat radiation corrected value with process load current value I1 less than rated current I since last time
0Duration of state be directly proportional, deduct heat radiation correction value delta tP, the accumulated current value S1 (step 54) behind the calculation correction the hot resume of within the elapsed time of past when surpassing the overcurrent condition of rated current, accumulating and obtaining, the accumulated current value S2.In addition, P is constant, is the coefficient of heat transfer in the unit interval, and the long-pending correction of residual current is processed corresponding with the cooling of alternating current circuit 1.
Become in the situation of S1＜0 at accumulated current value S1, accumulated current value to this and last time is carried out initialization, namely be set as S1=S2=0 (step 56), and overcurrent sign F is set to closes (F=0), the timing that is transferred to the energising duration corresponding with the load current value that is less than or equal to load current value is processed.
Be in the situation of S1 〉=0 at accumulated current value S1, the timing that directly is transferred to the energising duration corresponding with the load current value that is less than or equal to load current value is processed.
Timing as the energising duration corresponding with the load current value that is less than or equal to load current value is processed, judge load current value I1 whether with the load current value identical (step 34) of last time, when load current value I1 is identical, in energising duration T 1, add that the processing time is through excessive Δ t, with time of obtaining as current energising duration T 1=T1+ Δ t, upgrade the energising duration (step 35).Load current value I1 with respect on sub-value when variation has occured, the duration of will switching on is made as the time through excessive T1=Δ t, upgrades energising duration T 1 (step 36).Then, use is upgraded by this elapsed time and is processed the energising duration T 1 relative with load current value I1 that calculates, carry out the maximum conduction time computing (step 37～40) relative with load current value I1, the maximum load selectivity characteristic Graphics Processing (step 41) after upgrading.
According to present embodiment, owing to have maximum conduction time of storage part 11, its storage is corresponding with each the load current value I1 that flows through alternating current circuit 1 and by the maximum that conduction time, measurement section 10 the was measured duration T max (I1) that switches on, thereby the variation that can hold the load current in the overcurrent zone that the run action by a plurality of load equipments that are connected with alternating current circuit 1 causes is the maximum load selectivity characteristic, so can easily set the overcurrent trip characteristic.
In addition, hot resume have been considered in the computational methods by the duration of switching in the maximum corresponding with each load current value of maximum load selectivity characteristic, thereby can obtain the maximum load selectivity characteristic that is complementary with the overcurrent trip action that comprises hot resume of electronic circuit breaker 102, can set exactly the overcurrent trip characteristic.
In addition, by adopting the easy means of in the timing of the energising duration corresponding with the load current value that is less than or equal to load current value is processed, not considering hot resume, the processing that can alleviate control device 8.
In addition, because maximum load selectivity characteristic curve 21 and overcurrent trip characteristic curve 20 are presented in the display part 12 together, so can more easily set the overcurrent trip characteristic.
In addition, owing to have communication interface 13, it receives/sends for each data and the external equipment that will consist of maximum load selectivity characteristic and overcurrent trip characteristic, therefore also can easily set the overcurrent trip characteristic from long-range.
In addition, in the present embodiment, only put down in writing the long situation of characteristic in limited time, but for the situation of short characteristic in limited time and temporal properties, also can make the computational methods of maximum energising duration of maximum load selectivity characteristic 21 identical with the method for each overcurrent trip processing.
In addition, constitute will be corresponding with each load current value I1 the maximum energising duration as the maximum load selectivity characteristic, but also can constitute, each load current value is for example replaced with percent value with respect to the circuit-breaker rated current, by load current value is divided into more than or equal to 100% less than 200%, more than or equal to 200% less than 300% scope, and so that the amount minimizing of the data that consisted of by the scope of each load current value and the maximum energising duration relative with it.
Execution mode 4
Fig. 9 be the electronic circuit breaker 103 of expression in the embodiments of the present invention 4 obtain the key diagram of method of the effective value of load current according to sampling, Figure 10 is the flow chart of the action of expression electronic circuit breaker 103.The block diagram of the structure of expression electronic circuit breaker 103 is identical with Fig. 1.
In execution mode 3, implement the computing that load current value I1 reaches the energising duration corresponding with load current value I1 every the detection sampling period of current signal Δ t, but in the present embodiment, ac power frequency every alternating current circuit 1 is the common multiple Δ T in the cycle of 50Hz and 60Hz as shown in Figure 9, carries out the calculation process that load current value I1 reaches the energising duration corresponding with load current value I1.Other structure is because identical with execution mode 3, and therefore the description thereof will be omitted.
Below, action is described.
Action according to the flowchart text control device 8 of Figure 10.This processing is not to carry out every the sampling period of current signal Δ t, but be that the common multiple Δ T in the cycle of 50Hz and 60Hz carries out every the ac power frequency of alternating current circuit 1, therefore by accumulation of electrical current meter unit pair and elapsed time be Δ T during corresponding electric current amass and add up and become ∑ (Δ tI1
2), according to S1=S2+ ∑ (Δ tI1
2) calculating accumulated current value S1 (step 51a).
In addition, also be to processing load current value I1 less than rated current I since last time by the long-pending correcting unit of residual current because the long-pending correction of residual current is processed
0Duration be to add up during the Δ T, so the heat radiation corrected value becomes ∑ (Δ tP), from the accumulated current value S2 of the hot resume of last time, deduct heat radiation corrected value ∑ (Δ tP), the accumulated current value S1 (step 54a) behind the calculation correction.
During the timing of the energising duration corresponding with the load current value that is less than or equal to load current value is processed similarly, judge load current value I1 whether with the load current value identical (step 34) of last time, when load current value I1 is identical, in energising duration (T1), add that the processing time is through excessive Δ T, with the energising duration (T1=T1+ Δ T) as this time of obtaining, upgrade the energising duration (step 35a).Load current value I1 with respect on sub-value when variation has occured, the duration of will switching on is made as the time through the excessive T1=of being Δ T, upgrades energising duration T 1 (step 36a).Other action is because identical with execution mode 3, and therefore description thereof is omitted.
According to present embodiment, owing to have maximum conduction time of storage part 11, its storage is corresponding with each the load current value I1 that flows through alternating current circuit 1 and by the maximum that conduction time, measurement section 10 the was measured duration T max (I1) that switches on, thereby the variation that can hold the load current in the overcurrent zone that the run action by a plurality of load equipments that are connected with alternating current circuit 1 causes is the maximum load selectivity characteristic, so can easily set the overcurrent trip characteristic.
In addition, hot resume have been considered in the computational methods by the duration of switching in the maximum corresponding with each load current value of maximum load selectivity characteristic, thereby can obtain the maximum load selectivity characteristic 21 that is complementary with the overcurrent trip action that comprises hot resume of electronic circuit breaker 103, can set exactly the overcurrent trip characteristic.
In addition, by adopting the easy means of in the timing of the energising duration corresponding with the load current value that is less than or equal to load current value is processed, not considering hot resume, the processing that can alleviate control device 8.
In addition, because be the common multiple Δ T in the cycle of 50Hz and 60Hz every the ac power frequency of alternating current circuit 1, carry out the computing of load current value I1 and energising duration corresponding with load current value I1, so can further alleviate the processing of control device 8.
In addition, because maximum load selectivity characteristic curve 21 and overcurrent trip characteristic curve 20 are presented in the display part 12 together, so can more easily set the overcurrent trip characteristic.
In addition, owing to have communication interface 13, it receives/sends for each data and the external equipment that will consist of maximum load selectivity characteristic and overcurrent trip characteristic, therefore also can easily set the overcurrent trip characteristic from long-range.
In addition, in the present embodiment, only put down in writing the long situation of characteristic in limited time, but for the situation of short characteristic in limited time and temporal properties, also can make the computational methods of maximum energising duration of maximum load selectivity characteristic 21 identical with the method for each overcurrent trip processing.
In addition, constitute will be corresponding with each load current value I1 the maximum energising duration as the maximum load selectivity characteristic, but also can constitute, each load current value is for example replaced with percent value with respect to the circuit-breaker rated current, by load current value is divided into more than or equal to 100% less than 200%, more than or equal to 200% less than 300% scope, and so that the amount minimizing of the data that consisted of by the scope of each load current value and the maximum energising duration relative with it.
Claims (6)
1. electronic circuit breaker, it has: make and break contact, it makes the circuit on/off; Tripgear, it disconnects this make and break contact; Current detecting unit, it detects the electric current in the described circuit; Overcurrent trip property settings section, it is set and is used for corresponding with the overcurrent that flows through described circuit and overcurrent trip characteristic that described make and break contact is disconnected; And control device, it exports trip signal based on described overcurrent trip characteristic with by the detected detection electric current of described current detecting unit to described tripgear,
Its characteristic is to have:
Conduction time measurement section, it carries out timing to the energising duration corresponding with described detection electric current; Maximum conduction time storage part, its storage by this conduction time measurement section corresponding with described detection electric current and maximum that measure is switched on the duration; And display unit, it shows maximum load selectivity characteristic and overcurrent trip characteristic that this maximum load selectivity characteristic was made of the maximum energising duration corresponding with detecting electric current that is stored in this maximum storage part conduction time together.
2. electronic circuit breaker, it has: make and break contact, it makes the circuit on/off; Tripgear, it disconnects this make and break contact; Current detecting unit, its sense cycle with regulation detects the electric current in the described circuit; Overcurrent trip property settings section, it is set and is used for corresponding with the overcurrent that flows through described circuit and overcurrent trip characteristic that make and break contact is disconnected; And control device, it exports trip signal based on described overcurrent trip characteristic with by the detected detection electric current of described current detecting unit to described tripgear,
Its characteristic is to have:
Maximum storage part conduction time, the maximum energising duration that its storage is corresponding with described detection electric current; Display unit, it shows maximum load selectivity characteristic and overcurrent trip characteristic that this maximum load selectivity characteristic was made of the maximum energising duration corresponding with detecting electric current that is stored in this maximum storage part conduction time together; Accumulation of electrical current meter unit, it is when surpassing the rated current of circuit-breaker by the detected detection electric current of described current detecting unit, the square value of the described detection electric current of computing and the electric current between the described sense cycle are long-pending, simultaneously, and by accumulating and computing accumulated current value described electric current is long-pending; Residual current amasss correcting unit, when it is less than or equal to described rated current at described detection electric current, deducts from described accumulated current value and cools off suitable hot resume value; And load current time limit scaling unit, its will be from described accumulation of electrical current meter unit or the described accumulated current value that obtains of the long-pending correcting unit of residual current divided by the square value of described detection electric current, the computing load current electrifying time,
The described energising duration that store in the storage part maximum conduction time is the load current conduction time that is calculated by load current time limit scaling unit.
3. electronic circuit breaker according to claim 2 is characterized in that,
Have measurement section conduction time, it carries out timing to the energising duration corresponding with the detected detection electric current of current detecting unit,
The maximum energising duration of storing in the storage part maximum conduction time, when described detection electric current surpasses the rated current of circuit-breaker, it is the load current conduction time that is obtained by load current time limit scaling unit, when described detection electric current is less than or equal to described rated current, it it is the maximum energising duration by described conduction time, measurement section was measured.
4. the described electronic circuit breaker of any one in 3 according to claim 1 is characterized in that,
Have communication unit, it is used for maximum load selectivity characteristic and overcurrent trip characteristic are sent to external equipment, and this maximum load selectivity characteristic was made of the maximum energising duration corresponding with detecting electric current that is stored in maximum storage part conduction time.
5. electronic circuit breaker, it has: make and break contact, it makes the circuit on/off; Tripgear, it disconnects this make and break contact; Current detecting unit, it detects the electric current in the described circuit; Overcurrent trip property settings section, it is set and is used for corresponding with the overcurrent that flows through described circuit and overcurrent trip characteristic that described make and break contact is disconnected; Control device, it is based on described overcurrent trip characteristic with by the detected detection electric current of described current detecting unit, to described tripgear output trip signal; Conduction time measurement section, it carries out timing to the energising duration corresponding with described detection electric current; Maximum conduction time storage part, its storage by this conduction time measurement section corresponding with described detection electric current and maximum that measure is switched on the duration; And communication unit, it is used for maximum load selectivity characteristic and overcurrent trip characteristic are sent to exterior display device, and this maximum load selectivity characteristic was made of the maximum energising duration corresponding with detecting electric current that is stored in this maximum storage part conduction time.
6. electronic circuit breaker is characterized in that having:
Make and break contact, it makes the circuit on/off; Tripgear, it disconnects this make and break contact; Current detecting unit, its sense cycle with regulation detects the electric current in the described circuit; Overcurrent trip property settings section, it is set and is used for corresponding with the overcurrent that flows through described circuit and overcurrent trip characteristic that make and break contact is disconnected; Control device, it is based on described overcurrent trip characteristic with by the detected detection electric current of described current detecting unit, to described tripgear output trip signal; Maximum storage part conduction time, the maximum energising duration that its storage is corresponding with described detection electric current; Communication unit, it is used for maximum load selectivity characteristic and overcurrent trip characteristic are sent to exterior display device, and this maximum load selectivity characteristic was made of the maximum energising duration corresponding with detecting electric current that is stored in this maximum storage part conduction time; Accumulation of electrical current meter unit, it is when surpassing the rated current of circuit-breaker by the detected detection electric current of described current detecting unit, the square value of the described detection electric current of computing and the electric current between the described sense cycle are long-pending, simultaneously, and by accumulating and computing accumulated current value described electric current is long-pending; Residual current amasss correcting unit, when it is less than or equal to described rated current at described detection electric current, deducts from described accumulated current value and cools off suitable hot resume value; And load current time limit scaling unit, its will be from described accumulation of electrical current meter unit or the described accumulated current value that obtains of the long-pending correcting unit of residual current divided by the square value of described detection electric current, the computing load current electrifying time,
The described energising duration that store in the storage part maximum conduction time is the load current conduction time that is calculated by load current time limit scaling unit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008-261588 | 2008-10-08 | ||
| JP2008261588A JP5212005B2 (en) | 2008-10-08 | 2008-10-08 | Electronic circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101714749A CN101714749A (en) | 2010-05-26 |
| CN101714749B true CN101714749B (en) | 2013-04-10 |
Family
ID=42256101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910118671 Expired - Fee Related CN101714749B (en) | 2008-10-08 | 2009-02-27 | Electronic circuit breaker |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5212005B2 (en) |
| CN (1) | CN101714749B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014183637A (en) * | 2013-03-19 | 2014-09-29 | Panasonic Corp | Power distribution system and current-limiting device |
| CN103311880A (en) * | 2013-06-28 | 2013-09-18 | 上海工程技术大学 | Circuit breaker overcurrent setting system |
| JP6848204B2 (en) * | 2016-04-26 | 2021-03-24 | 三菱電機株式会社 | Circuit breaker |
| US10566779B2 (en) * | 2016-06-02 | 2020-02-18 | Bombardier Transportation Gmbh | External DC overcurrent electronic trip unit for circuit breaker |
| WO2019244292A1 (en) * | 2018-06-21 | 2019-12-26 | 三菱電機株式会社 | Electronic circuit breaker |
| WO2020161890A1 (en) * | 2019-02-08 | 2020-08-13 | 三菱電機株式会社 | Electronic circuit breaker and circuit breaker system using same |
| WO2021106116A1 (en) * | 2019-11-27 | 2021-06-03 | 三菱電機株式会社 | Electronic circuit breaker and circuit breaker system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1076811A (en) * | 1992-03-04 | 1993-09-29 | 三菱电机株式会社 | Circuit-breaker |
| US5463252A (en) * | 1993-10-01 | 1995-10-31 | Westinghouse Electric Corp. | Modular solid state relay |
| CN1137685A (en) * | 1995-01-09 | 1996-12-11 | 株式会社日立制作所 | Circuit breaker |
| CN1619907A (en) * | 2003-11-20 | 2005-05-25 | 三菱电机株式会社 | Circuit breaker |
| CN101122618A (en) * | 2006-08-07 | 2008-02-13 | 三菱电机株式会社 | Electrified information measuring device and circuit breaker with the same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03269928A (en) * | 1990-03-19 | 1991-12-02 | Fuji Electric Co Ltd | Digital protective relay |
| JPH08223777A (en) * | 1995-02-09 | 1996-08-30 | Toshiba Corp | Load controller |
| JP3668652B2 (en) * | 1999-10-22 | 2005-07-06 | 三菱電機株式会社 | Electronic circuit breaker |
| JP3833242B1 (en) * | 2006-02-22 | 2006-10-11 | 株式会社ダイドービルシステム | Electronic breaker |
-
2008
- 2008-10-08 JP JP2008261588A patent/JP5212005B2/en not_active Expired - Fee Related
-
2009
- 2009-02-27 CN CN 200910118671 patent/CN101714749B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1076811A (en) * | 1992-03-04 | 1993-09-29 | 三菱电机株式会社 | Circuit-breaker |
| US5463252A (en) * | 1993-10-01 | 1995-10-31 | Westinghouse Electric Corp. | Modular solid state relay |
| CN1137685A (en) * | 1995-01-09 | 1996-12-11 | 株式会社日立制作所 | Circuit breaker |
| CN1619907A (en) * | 2003-11-20 | 2005-05-25 | 三菱电机株式会社 | Circuit breaker |
| CN101122618A (en) * | 2006-08-07 | 2008-02-13 | 三菱电机株式会社 | Electrified information measuring device and circuit breaker with the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5212005B2 (en) | 2013-06-19 |
| JP2010093946A (en) | 2010-04-22 |
| CN101714749A (en) | 2010-05-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101714749B (en) | Electronic circuit breaker | |
| CN103201922B (en) | For the protection of the breaker of load | |
| EP2296243B1 (en) | Protection device for load circuit | |
| TWI506906B (en) | Device and method for providing energy and related system | |
| EP2237296A2 (en) | Circuit breaker switching control system | |
| CN103985617B (en) | A kind of Intelligent fuse | |
| CN104350656A (en) | Wireless branch circuit energy monitoring system | |
| EP3340262B1 (en) | System and method for monitoring contact life of a circuit interrupter | |
| CN101647169A (en) | Phase control switch and switching pole control method in phase control switch | |
| KR20130034772A (en) | System and method for detecting power quality abnormal waveform of the electric power distribution system | |
| CN101371414A (en) | Circuit breaker and method for sensing current indirectly from bimetal voltage and determining bimetal temperature and corrected temperature dependent bimetal resistance | |
| US7928723B2 (en) | Measurement of dissipated power | |
| JPWO2015056326A1 (en) | Power switching control device and opening control method | |
| US20170122995A1 (en) | Method and arrangement for detecting a meter maintenance condition using winding resistance | |
| KR20140068965A (en) | Device and method for protecting a load | |
| RU2550337C2 (en) | Method for determining residual life of automatic circuit breakers | |
| JP4657965B2 (en) | Power monitoring system | |
| JP2011171178A (en) | Circuit breaker monitoring device, and throw-in detection method of circuit breaker monitoring device | |
| KR20120136952A (en) | System and method for monitoring ground fault of high resistance | |
| EP2717289B1 (en) | Electronic circuit breaker | |
| JP2010238611A (en) | Breaker operation monitor | |
| JP5295214B2 (en) | Monitoring device | |
| JPH11168833A (en) | Power-controlling device | |
| CN106771431B (en) | Intelligent electric energy meter capable of detecting on-off state | |
| CN113410816A (en) | Current overload protection device and method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130410 Termination date: 20210227 |