CN1529929A - Detection of arcing in DC electrical system - Google Patents
Detection of arcing in DC electrical system Download PDFInfo
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- CN1529929A CN1529929A CNA01818720XA CN01818720A CN1529929A CN 1529929 A CN1529929 A CN 1529929A CN A01818720X A CNA01818720X A CN A01818720XA CN 01818720 A CN01818720 A CN 01818720A CN 1529929 A CN1529929 A CN 1529929A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
- H02H1/0015—Using arc detectors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/50—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to the appearance of abnormal wave forms, e.g. ac in dc installations
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/44—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to the rate of change of electrical quantities
- H02H3/445—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to the rate of change of electrical quantities of DC quantities
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Abstract
Arcing faults in dc electric power systems are detected by apparatus which responds to a predetermined drop either in voltage across, or current drawn by, a dc load. The voltage and current drops can be measured values or scaled to the source voltage. In another arrangement, the load current is interrupted momentarily when a step decrease in current is detected. If the dc current does not return, within a predetermined margin, to the decreased value before interruption, arcing is indicated. In a third embodiment, drift of the load current following detection of a step decrease, either upward toward a short or downward toward an open circuit, is taken as an indication of arcing.
Description
Technical field
The present invention relates to the detection of flashover in direct current (DC) electric power system and/or the measure of antiarcing-over, above-mentioned arcing comprises electric arc in parallel and serial arc.
Background technology
Provide overload protection in the DC electric power system, it is very general reaching overcurrent protection is provided sometimes.Overload protection normally provides with a thermal element or an electronic circuit, the heating of above-mentioned thermal element analog ligand electric line, and when bimetallic reaches a certain temperature, make the contact point open circuit, and the identical thermal process of above-mentioned electronic circuit simulation.Overcurrent protection is provided by an instantaneous disconnecting members usually, and implements by a magnetic force disconnecting apparatus or electronic simulation, if electric current surpasses a specific threshold value, as the value that short circuit reached, then above-mentioned instantaneous disconnecting members makes circuit breaker opens rapidly.Do not having under the situation of instantaneous ability, fuse is a kind of tractable thermal cutoff devices.
Except overload and short-circuit protection, current research is interested in anti-electric lonely failure measure in the DC electric power system.Arc fault comprises a kind of zone of the high concentration of generating heat, one type " heat spot ", and this heating high concentration zone may cause insulation breakdown, produces combustion product, and spurts the thermometal particle.It also may be caused by the lead or the bad connection of fracture.
Arc fault can be a serial or parallel connection.The example of serial arc is that the broken string two ends are close to and are enough to cause arcing, and perhaps bad is electrically connected.Electric arc in parallel is to take place between comprising lead and ground between the lead of different potentials.Arc fault is connected with power supply, and serial arc is also connected with load.Arc fault has one than higher impedance.Therefore, serial arc causes load current to reduce, and can't detect with the standard overload and the overcurrent protection of usual protective device.Even electric arc in parallel can produce the electric current above nominal rated current in the circuit, but the electric current that electric arc in parallel produces can be irregular, makes the RMS value less than the generation thermal cutoff, or postpones the needed value of operation at least.Arc voltage and line impedance usually can stop electric arc in parallel to reach the current level of the instantaneous break function of enough startups.
Owing to many reasons, automobile circuit will be transferred to higher voltage as 36 or 42 volts, and this high voltage is disproportionately easier of electric arc damages than 14 volts of present circuit, this mainly be since arc voltage between 12 volts and 30 volts.Even 28 volts of circuit using always in aerospace industry, also proof provides supporting to keep the environment of flashover.Also having a most important unfavorable factor outside the unfavorable factor of being found in the dwelling house electric power system is that vibration and dirt under quite big humidity also is unfavorable factor sometimes.In addition, field of telecommunications adopts 24 volts of (and can transfer to 48 volts) DC systems, the also easy arcing of described system.Electric arc under these voltages can not exist in advance, that is must separate " generation " by the contact.If originally electric arc extinguish to an open circuit, they should not take place again so in theory.But there is carbonization or introduces other dynamic pollutant, ionized gas (life period is very short) and vibration, contact surface again is so repeatedly the situation of Fa Shenging is common.The movable vehicle that travels by some elements particularly.
Summary of the invention
The present invention is directed to the device that is used for detecting series connection and two kinds of arc faults in parallel and anti-above-mentioned arc fault at the DC circuit.It comprises detects the voltage stride across load or through the minimizing of the current both of overload, above-mentioned minimizing be detect by local sensor and analyze at Local or Remote.Under the remote analysis situation, transducer and control information can transmit as a multiplex system by the carrier on the branch circuit or by an independent communication link.It also comprises some switches, and described switch is by disconnecting the affected load in electric arc downstream or by cutting off the whole branch circuit in upstream local arc fault being isolated.One aspect of the present invention comprises that detection is changed by the repeated step that electric arc produces.It comprises that also upwards being offset to fault by the observation arc current disappears to short circuit, or offset downward and reduce to zero to fault open circuit and electric current and come monitoring current, the initial step that described electric current can be followed in the DC arc fault changes so that disconnect difference mutually with other phenomenon such as load.
According to another aspect of the present invention, can detect serial arc by temporary transient turn-off current when detecting current step decline.Roughly the same when if the amplitude that making current turns back to and it disconnect, then may cause by other phenomenon.If the electric current after connection is not roughly the same with step decline electric current afterwards, then no matter be that electric current is much bigger or much smaller, the arc fault that a kind of destroyed is extremely opened a way to the arc fault or the destroyed of short circuit has taken place respectively all.
Description of drawings
When seeing in conjunction with the accompanying drawings, can fully understand the present invention from following description of a preferred embodiment, wherein:
Fig. 1 is the current waveform figure of serial arc in a DC electric power system.
Fig. 2 is the voltage oscillogram that serial arc produced in a DC electric power system.
Fig. 3 illustrates to implement that local serial arc detects and the schematic circuit diagram of the first embodiment of the invention that Reduction of Students' Study Load is carried.
Fig. 4 illustrates to implement local the detection and the present invention second that local Reduction of Students' Study Load year is communicated by letter with supply voltage
The schematic circuit diagram of embodiment.
Fig. 5 implements the local third embodiment of the invention schematic circuit diagram that detects of arc fault with central arc fault detection and response.
Fig. 6 uses another embodiment schematic circuit diagram that a multiplex system is communicated by letter between load and middle position.
Fig. 7 is an interim turn-off current blow-out and an embodiment schematic circuit diagram that detects current level then.
Fig. 8 detects serial arc and can and be corrupted to another embodiment schematic circuit diagram of distinguishing between the serial arc of open circuit at the serial arc that is corrupted to short circuit.
Fig. 9 is the current waveform figure of a kind of electric arc in parallel in a DC electric power system.
Figure 10 is of the present invention and embodiment illustrated in fig. 3 similar, but an embodiment schematic circuit diagram that changes in response to the DC load current.
Figure 11 is of the present invention and embodiment illustrated in fig. 4 similar, but an embodiment schematic circuit diagram that changes in response to the DC load current.
Figure 12 is of the present invention and embodiment illustrated in fig. 5 similar, but an embodiment schematic circuit diagram that changes in response to the DC load current.
Figure 13 is of the present invention and embodiment illustrated in fig. 6 similar, but an embodiment schematic circuit diagram that changes in response to the DC load current.
Embodiment
Fig. 1 and 2 is illustrated in respectively in direct current (DC) electric power system by the electric current of a series connection electric arc generation and the exemplary of voltage waveform.As can see from Figure 1, when the starting the arc, after a noise hold period, there is the step of some electric currents change.Electric arc or be corrupted to short circuit then, or be corrupted to open circuit, on load current begins under the above-mentioned short-circuit conditions, move and jump to then its preceding value (trace A), take place, and electric current moves down and drop to then zero (trace B) under above-mentioned open circuit situation until second electric arc.
Fig. 2 is illustrated in one 42 volts of DC systems, all is under 42 volts before electric arc takes place with supply voltage shown in the solid line and the voltage that strides across load shown in broken lines.The voltage that strides across load then when electric arc is introduced with load is connected sizable impedance significantly descends.We find, significant electric arc of about 75% indication that reduces as be less than nominal system voltage.Therefore, in 42 volts of systems, drop to and be lower than about 30 volts if stride across the voltage of load, then expression has a series connection electric arc.Should be noted that supply voltage also may be owing to fault descends, but at supply voltage with stride across the voltage difference that has between the voltage of load at least about 12 volts.When blow-out, supply voltage and load voltage the two all return nominal value when another electric arc occurring till.If blow-out to an open circuit, then load voltage also may drop to zero.Because the effect of vibration and/or carbon, reignition of arc also is possible.
Must consider, in the DC circuit, might produce the phenomenon of the waveform that must differentiate with arc fault.For example, making load disconnection or connection may produce step changes.
Fig. 3 schematically illustrates the DC electric power system 1 of making power supply with battery 3, and above-mentioned battery 3 for example can have the nominal voltage of 36 volts or 42 volts.Battery offers many branch circuits 5 with electric power, and each branch circuit 5 is all used and is arranged on fuse 7 protections in safety box or the control box 9.
Each branch circuit 5 is all to one or more loads 11
1, 11
2Electric power is provided.Shown in position one series connection electric arc 13 will can not influence significantly and stride across load 11
1Voltage.Yet, when it and load 11
2During series connection, the voltage that strides across this load will begin to descend about at least 25% or more as mentioned above.Therefore, according to this embodiment of the present invention, a detector 15 strides across load 11 by voltage sensor 16 monitorings
2Voltage, and if above-mentioned voltage be lower than threshold value being longer than to drop in the scheduled time slot, for example, to one 42 volts of systems, in the period of being longer than at least about 10 milliseconds (ms), preferably be lower than about 30 volts being longer than to drop in the period of about 20ms, then show the generation arc fault.Detecting electric arc can be used to make the local switch 17 of connecting with electric arc to open.Alternatively, or in addition, can start an indicating device such as light-emitting diode (LED).
Fig. 4 illustrates an alternative embodiment of the invention, and the voltage that one of them transducer 21 will stride across load 21 is provided to a native processor 23.This processor also receives the signal of a representative from the supply voltage of power control assembly 9.Supply voltage transducer 25 in the power control assembly produces the signal that a representative offers the supply voltage of transmitter 27.Above-mentioned transmitter 27 modulation are sent to the carrier signal of branch circuit 5.Modulated carrier signal is received by receiver 29, and receiver 29 provides the supply voltage index signal to processor 23.Above-mentioned processor 23 deducts the voltage that strides across load from supply voltage, and if difference surpass a set point value being longer than in the predetermined periods, then showing has electric arc and local switch 17 is opened.For example, in 42 volts of DC systems, if difference is higher than 12 volts being longer than in the period of 20ms, then showing has a series connection electric arc.
Forward Fig. 5 to, read the voltage that strides across load 11 in this locality, convert thereof into digital signal by an analog to digital (A/D) converter 31, and it is modulated into a carrier signal by transmitter 27, send to power control assembly 9 by branch circuit 5, at these power control assembly 9 places, carrier signal is by a receiver 29 demodulation and offer microprocessor 33.Microprocessor 33 is for example by determining in the period of selecting, in 10ms at least the period, whether the voltage that preferably has 20ms to stride across load in the period drops to is lower than absolute threshold, and whether perhaps local measured value is lower than supply voltage, comes a series connection electric arc is tested.If detect an electric arc, then microprocessor 33 can open the switch 35 in the power control assembly 9.This switch 35 can be arc fault current circuit breaker for example, and this circuit breaker also provides protection to electric arc in parallel.Because microprocessor 33 is in the power control assembly, so it also is in the position that whole branch circuits 5 is provided electric arc fault protection.
With the carrier signal on the branch circuit as the substitute of communicating by letter between load and the power control assembly, in many application, can adopt multiplex system, from the power control assembly or from the information of load normally by as at the sensor/actuators chip 36 as shown in Fig. 6 embodiment, on communication bus 34, transmit, also can use other medium such as radio communication with block form.
In each embodiment of Fig. 3-6, can detect serial arc through the electric current of overload rather than through the voltage of overload by monitoring.Under the sort of situation, if deduct through the rated current of overload the electric current that records divided by rated current less than a predetermined value as for example 0.7, then represent a kind of disconnection.In addition, serial arc arranges an impedance to connect with the load that reduces load current.If the use electric current, then the rated current of each load is essential known.And for example, if load has a plurality of conditions of work, so multiple speed is set, and then must know rated current to above-mentioned condition of work.
Except use by series connection a electric current that electric arc produced fall or voltage drop, can be with other logic in the embodiment of Fig. 3-6.For example, when series electrical orphan's electric current and the two waveform of downstream voltage show that a succession of step changes during in the starting the arc, then can use the algorithm that the time decay to these pulses adds up, as in U.S. Patent No. 5,691, described in 869.And, below the relevant arc fault detector logic of electric arc described and in parallel also can be as the logic of these serial arc detectors, in above-mentioned electric arc in parallel filtered load current with the continuum integration and with detect randomness and compare.
The embodiment of Fig. 3-6 strides across the voltage detecting serial arc of load by monitoring, and therefore requires in each load place transducer is arranged all.Embodiment shown in Figure 7 detects serial arc by monitoring current, then can be provided with at a distance, and preferably be arranged in center such as the power control assembly 9.This embodiment monitoring is used for the branch current that current step changes.Because it may be because the disconnection of load or the variation of connection or loaded work piece condition that the step of electric current changes, thus this specification requirement when detecting the step variation of a selected amplitude moment turn-off current.This interruption of current will make arc extinction.As referring to what Fig. 1 remembered, electric arc can be corrupted to short circuit and be corrupted to open circuit.Therefore, if when electric power is got back to connection, electric current reaches the value before step descends, and perhaps reaches zero, and this phenomenon is exactly an electric arc.On the other hand, if electric current turns back to the value that is similar to when being the electric current disconnection, then the variation of electric current is not owing to electric arc, but owing to certain other activity in the circuit causes as the load disconnection.The time period that disconnects should be long enough to blow-out, but is not long enough to make load to produce serious interruption.Be the about 30ms of about 5ms-typical opening time.
Forward Fig. 7 to, the protective circuit 37 that is arranged in the power control assembly 9 comprises a current sensor 39 and a solid-state switch 41 that is connected in the branch circuit 5.The current signal that records is added on the event detector 43, this event detector 43 comprises that is detected the band pass filter 45 that step changes, with a negative step threshold dector 47, this detector 47 descends greater than a selected value in response to the step of electric current, as for example in 42 volts of DC systems, being about 25%-80%, preferably about 50%.The generation of incident is delivered on the processor 49 with recording electric current, and these processor 49 using electric arcs detect logic.When processor 49 is digital processing unit, be transformed into digital signal with an A/D converter with processor with recording electric current.The generation of incident, the reduction that is to say load current has been set an instantaneous disconnection logic 51 greater than a selected value, and this instantaneous disconnection logic disconnects solid-state switch 41, so that interrupt the electric current in the branch circuit 5.Event signal also starts a timer 53, and this timer 53 is measured previously selected opening time of 5ms-30ms and reset instantaneous disconnection logic 51 then according to appointment, so that solid-state switch returns connection.Before the electric current of arc-detection logic after reconnecting deducts and disconnects but initial step after reducing electric current and divided by the electric current before disconnecting.If the absolute value of result of calculation is less than predetermined value, according to appointment 0.2, then there is not electric arc to take place.Otherwise processor 49 is set instantaneous disconnection logic 51 again, so that disconnect solid-state switch, and the series arc faults that protection branch circuit 5 is avoided detecting influences.
Another embodiment of the present invention monitoring shown in Fig. 8 is by the current offset after originally step changes in the electric current of serial arc generation.Again referring to Fig. 1, as can be seen, serial arc electric current or upwards skew and destroying to short circuit then lentamente so that electric current returns initial value before its electric arc, or offset downward lentamente and destroy to open circuit then.Therefore, in this embodiment of the present invention, any slow skew of electric current after step descends all distinguished out.If slowly skew is upwards, the current value and skew a period of time of storage before then step being descended, the current value of for example about 0.1-1 second compares.If these two current values are approximately equal, the electric arc of a short circuit is arranged then.If two current values are approximately inequal, then do not have electric arc, but change owing to certain other phenomenon causes the step of electric current.Bear if after step descends, be offset, then to step decline number counting, and if reach selected counting at the selected time interval such as 0.1-in about 1 second, as for example 2-4, the electric arc that then has a destruction extremely to open a way.
Therefore, as what in Fig. 8, seen, be added on the event detector 43 by current sensor 39 detection electric currents and with it.In the embodiment at Fig. 7, this event detector 43 comprises a band pass filter and a negative threshold value detector, and the current step that this negative threshold value detector detects greater than a predetermined amplitude descends.The detection that electric current first step descends starts timer 57 and starts a sampling and holding circuit 59, the current value before this sampling and holding circuit 59 storage steps descend, and this current value is preserved by delay circuit 61.A slow offset detector 63 can be a low pass filter, and this detector 63 is monitoring current also.Signal detector 65 detects the polarity of shifted signal.If polarity is for just, and timer 57 is overtime, then the initial current of storage and the existing electric current in the processor 67 are compared.If these two electric currents are about equally, then mean the electric arc destroyed to short circuit, produce the arc short circuit signal, this signal by one " or " (OR) circuit 69.If measure slow shifted signal polarity for negative with symbol detector 65, then start on the other hand, " with " (AND) door 71.Simultaneously, the number counting that the current step that 73 pairs of event detectors of counter 43 detect descends, if and counting reaches a selected counting in the interval of being set by timer 57, then the output of AND gate 71 uprises, so that produce an arc signal in output place of OR-gate 69.
The above embodiment of the present invention has solved the series arc faults in the DC electric power system.Electric arc in parallel example is shown in Figure 9 in the DC electric power system.This electric arc in parallel can adopt U.S. Patent No. 5,691, and device and the technology introduced in 869 are utilized the time decay that is changed by the current step that this electric arc produced to add up and detected, and comprise above-mentioned patent herein as a reference.This protection can be set in place in the arc fault circuit-breaker 35 in power control assembly 9, as shown in Fig. 5 and 6.Should be appreciated that this electric arc fault protection in parallel can be arranged to be used for series arc faults with this paper, and to detect any technology introduced irrelevant or combine with above-mentioned technology.
Also can detect the arc fault in parallel in the DC electric power system, and corresponding to utilizing U.S. Patent No. 5,933, circulating current integration comparison circuit and the technology introduced in 305.By being carried out bandpass filtering, electric current detects arc fault, so that when an electric arc occurring, all produce the current signal that records of tape pulse.Integrator that can reset in the time interval that equates as cycle of each interchange (interchange) electric current repeatedly with the current integration that records.The integrated value that records electric current is compared with the former corresponding time interval value that is stored in sampling and the holding circuit, and as 6 nearest time intervals, the measured value of integration increases and reduces between each interval for the selected number of storing in the shift register in indication.To each time interval, a chaos detector counting is for the increase in the nearest corresponding time interval of selected number and the variation number between the minimizing, and the counting weighted sum of the time decay that adds up.When summation reaches a scheduled volume, produce an output, as be used for the cut-off signal of circuit breaker.When being used for the alternating current system electric arc fault protection is provided; at patent No.5; the time interval that the electric lonely tracer of being introduced in 933,305 uses is the multiple of the cycle of alternating current fundamental frequency, and by a zero crossings detector with to exchange cycle synchronous.Because be added on the direct current power system herein, thus do not need the zero crossings detector, and the multiple of integration interval as the current step variation basic frequency cycle that is produced by an electric arc, for example about 120-500Hz.As mentioned above, periodic current integration comparison techniques also can be used to detect serial arc, because it and the electric arc step amplitude of variation in current generated is irrelevant, depends on movable randomness and replace.
In the DC electric power system of the periodic current integration comparison techniques even (PWM) drive unit that can be used for having pulse width modulation such as dimmer.In this case, integration interval is consistent with the repetition rate of pwm signal.Therefore, integration can be the multiple of repetition rate, and even the repetition rate that can follow the tracks of slow variation.
The present invention also comprises the decline of the DC electric current that detection is produced by a DC load, so that show the existence of DC electric arc.Figure 10-13 illustrates the application of the technology of this detection DC electric current decline to distribution system shown in Fig. 3-6, utilizes the decline of load voltage to detect arcing herein.As what seen in Figure 10, current sensor 75 detects by load 11
2The electric current that is produced, and this measurement offered processor 15.Under normal operation, load 11
2Produce a specified electric current I rated.Utilize load 11
2 Branch circuit 5 in serial arc 13 introduce a quite big impedance of connecting, this impedance and load Sharing supply voltage, and cause by load 11 with load
2The electric current that records that is produced reduces.If for a time cycle such as 10ms, 20ms preferably, this electric current that records drops at least than rated current low 25%, perhaps in other words, rated current drops to less than 0.75 of rated current, then produce an arcing signal, this arcing signal can be used to open switch 17, so that make load 11
2Separate with the DC power supply, and/or the indication of arcing incident is provided, as illuminating with LED 19.
In direct-flow distribution system shown in Figure 11 1, processor 23 not only provides the electric current that is produced by load 11 when detecting with current sensor 77, but also the supply voltage that is recorded by voltage sensor 25 V is provided
Source, and the process modulated carrier signal is sent on the branched line 5 by transmitter 27.Receiver 29 supplies processor 23 usefulness with the signal demodulation so that extract the DC supply voltage that records.In order to regulate any variation of DC supply voltage, if when detecting with current sensor 77 through the electric current of overload 11 less than in 0.75 of the rated current of DC supply voltage ratio, then processor 23 produces an arcing signal, because if supply voltage descends, will measure decline in proportion by the electric current that load produces.
In Figure 11, processor 23 is positioned near the load 11.Therefore, the DC supply voltage that records must be sent on the processor 23.In the DC of Figure 12 electric power system, processor 33 is arranged on away from load 11 places, and produces and must be sent to by the electric current that current sensor 77 records the processor 33 of distant place by load 11.Therefore, in analog-to-digital converter 81, with the current digitalization that records be sent out device 27 then and be used for modulating the carrier signal that is sent on the branch circuit 5, and handle for processor 33 so that extract current signal by receiver 29 demodulation.If the DC electric current that records a period as 10ms at least, but 20ms preferably drops to 0.75 times in the rated current of DC supply voltage ratio at least, then processor 33 produces an arcing signal as processor 23.Similar among arrangement among Figure 13 and Figure 12, but the electric current that records that is detected by current sensor 79 is to offer processor 33 at an Exterior Communications System on as a multiplex system, and information normally transmits by the grouping on the communication bus 31 between power control assembly 9 and load 11 via an actuator chip 81 in this communication system.
Although described certain embodiments more of the present invention in detail, those of ordinary skill in the art will understand that, according to the general description of disclosure, can research and develop various changes and substitute to those parts.Thereby disclosed special arrangements plan only is exemplary and is not as limitation of the scope of the invention that scope of the present invention is by gamut and any or all equivalent regulation thereof of claims.
Claims (43)
1. one kind provides the equipment that prevents the arcing protection the distribution system of DC electric power being supplied with the DC load from the DC power supply by branch circuit, and the said equipment comprises:
Detection strides across the voltage check device of the dc voltage of at least one load;
Produce arcing Signal Processing device according to the dc voltage that strides across at least one load that detects; And
The device that the arcing signal is responded.
2. the described equipment of claim 1, wherein the device that the arcing signal is responded comprises a switch, this switching response arcing signal disconnects at least one load and DC power supply.
3. the described equipment of claim 1, wherein processing unit comprises when the dc voltage that strides across at least one load that detects and reduces the device that produces the arcing signal when continuing a predetermined time interval at least about 25%.
4. the described equipment of claim 3, wherein preset time is about 10ms at least at interval.
5. the described equipment of claim 4, wherein the device that the arcing signal is responded comprises a switch, described switching response arcing signal and at least one load and DC power supply are disconnected.
6. the described equipment of claim 1, wherein voltage check device also comprises the device that detects supply voltage, and processing unit comprises the device that produces the arcing signal when the difference between the dc voltage that strides across at least one load that supply voltage detects equals a predetermined value at least.
7. the described equipment of claim 6, wherein predetermined difference is at least about 12 volts between the dc voltage that strides across at least one load of supply voltage and detection.
8. the described equipment of claim 6, the device that wherein detects supply voltage is away from least one load, and wherein processing unit comprises a processor and the dc voltage that strides across at least one load of supply voltage and detection offered the device of above-mentioned processor.
9. the described equipment of claim 8, wherein processor is positioned near at least one load.
10. the described equipment of claim 9 wherein is included in the device that on the branch circuit supply voltage is sent to processor to the device that supply voltage offers processor.
11. the described equipment of claim 10, wherein the device that on branch circuit supply voltage is sent to processor comprises a transmitter, described transmitter modulates on branch circuit by carrier signal that supply voltage sent.
12. the described equipment of claim 9 wherein comprises a communication system of separating with branch circuit to the device of power supply voltage supplying processor.
13. the described equipment of claim 8, wherein processor is positioned near the device that detects supply voltage, and the device of described detection supply voltage is away from least one load.
14. the described equipment of claim 13 wherein is included in the device that on the branch circuit dc voltage that strides across at least one load that detects is sent to processor to the device of the dc voltage supply processor that strides across at least one load that detects.
15. the described equipment of claim 14, wherein the device that the dc voltage that strides across at least one load that detects is sent on the processor comprises a transmitter, carrier signal that is sent by the dc voltage that strides across at least one load that detects on branch circuit of described transmitter modulates.
16. the described equipment of claim 13 wherein comprises a communication system of separating with branch circuit to the device of the dc voltage supply processor that strides across at least one load that detects.
17. the described equipment of claim 13, wherein the device that the arcing signal is responded comprises a near switch processor, described switching response arcing signal and the branch circuit that interrupts DC electric power is supplied with at least one load.
18. the equipment that the antiarcing-over protection is provided the distribution system of DC electric power being supplied with a DC load from a DC power supply by branch circuit, described equipment comprises:
In branch circuit, detect the current sensing means of electric current;
The step detector that the current step that detects by current sensing means in the branch circuit is descended and responds;
The disconnecting apparatus that the current step that the step detector is detected descends and responds, described device make load and DC power supply disconnection a period of time and make load then and the DC power supply reconnects; And
The device of an arcing signal of generation when load and DC power supply reconnect the electric current that is detected by current sensing means the back and do not turn back in the predetermined current range that is detected by current sensing means when load disconnects with the DC power supply.
19. the described equipment of claim 18, wherein disconnecting apparatus also responds to the arcing signal, so that response arcing signal keeps load and DC power supply to disconnect.
20. the described equipment of claim 18, the device that wherein produces the arcing signal comprises a processor, deduct load the electric current that described processor is detected by current sensing means when load and DC power supply disconnect and reconnect the electric current of back by the checkout gear detection with the DC power supply, the electric current that the absolute value of difference is detected by current sensing means when disconnecting simultaneously, and when quotient arcing signal of generation during greater than a set point value.
21. the described equipment of claim 20, wherein Xuan Ding value is not more than about 0.2.
22. the described equipment of claim 18, wherein decline responds at least about 25% the step detector to current step.
23. the described equipment of claim 22, that wherein load and DC power supply disconnect is the about 30ms of about 5ms-during this period of time.
24. the equipment that the antiarcing-over protection is provided in the DC distribution system of the DC power supply being supplied with the DC load by a branch circuit, the said equipment comprises:
Current sensor is used for being provided at the indication of the electric current that branch circuit detects;
The step detector is used for detecting the predetermined step of measured electric current and drops to a value that reduces;
Detect the device of measured current offset; And
When departing from the value of a minimizing, the electric current that records produces the device of arcing signal.
When 25. the described equipment of claim 24, the device that wherein produces the arcing signal measured electric current of a scheduled time after current step descends upwards is displaced near the current value that current step records before descending, generation arcing signal.
26. the described equipment of claim 25, wherein the minimizing of predetermined current step is at least 25% approximately.
27. the described equipment of claim 26, wherein the preset time cycle is about 1 second of 0.1-.
28. the described equipment of claim 24, the device that wherein produces the arcing signal also comprises after the current step that records descends, the electric current that records offset downward respond, when in a predetermined period of time, detecting the device that produces the arcing signal when predetermined quantity extra current step descends.
29. the described equipment of claim 28, wherein Yu Ding counting is about 2-4 counting.
30. the described equipment of claim 29, wherein the preset time cycle is about 0.1-1 second.
31. the equipment that the antiarcing-over protection is provided the distribution system that DC electric power is produced simultaneously a predetermined rated electric current from DC power supply supply load by the DC power supply by a branch circuit, described equipment comprises:
Checkout gear comprises the current sensing means of detection by the DC electric current of load generation; And
Processing unit produces an arcing signal when the DC electric current by load produced that records drops to when at least one selected ratio of predetermined rated electric current keeps a predetermined time interval.
32. the described equipment of claim 31, wherein when the DC electric current that produces by load that records drop to the predetermined rated electric current at least about 75% the time, processing unit produces an arcing signal.
33. the described equipment of claim 32, wherein preset time is spaced apart at least about 10ms.
34. the described equipment of claim 33, wherein the device that the arcing signal is responded comprises a switch, and described switching response arcing signal disconnects DC load and DC electric power.
35. the described equipment of claim 31, wherein checkout gear also comprises supply voltage checkout gear and processing unit, above-mentioned supply voltage checkout gear detects the DC supply voltage, and above-mentioned processing unit generation arcing signal when the DC electric current that records drops to selected ratio with the proportional rated current of DC supply voltage.
36. the described equipment of claim 35, wherein the selected ratio of rated current is not more than 75% of rated current.
37. the described equipment of claim 35, wherein the supply voltage checkout gear is away from the DC load, and wherein processing unit comprises a processor and supply voltage and the DC electric current that is produced by load that records offered the device of processor.
38. the described equipment of claim 37, wherein processor is positioned near the DC load.
39. the described equipment of claim 38, wherein the device that the DC supply voltage is offered processor is included in the device that sends the DC supply voltage on the branch circuit to processor.
40. the described equipment of claim 38 wherein comprises a communication system of separating with branch circuit to the device that the DC supply voltage offers processor.
41. the described equipment of claim 37, wherein processor is positioned near the supply voltage checkout gear and away from the DC load.
42. the described equipment of claim 41 wherein is included in the device of the DC electric current supply processor that is produced by the DC load that records on the branch circuit and records the device that the DC electric current sends to processor to what record by what the DC load produced.
43. the described equipment of claim 39 wherein comprises a communication system of separating with branch circuit to the device of the DC electric current supply processor that is produced by the DC load that records.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US24816200P | 2000-11-13 | 2000-11-13 | |
| US60/248,162 | 2000-11-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1529929A true CN1529929A (en) | 2004-09-15 |
Family
ID=22937954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA01818720XA Pending CN1529929A (en) | 2000-11-13 | 2001-11-09 | Detection of arcing in DC electrical system |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP1428303A2 (en) |
| JP (1) | JP3864381B2 (en) |
| KR (1) | KR20040028684A (en) |
| CN (1) | CN1529929A (en) |
| AU (1) | AU2002230649A1 (en) |
| CA (1) | CA2426901A1 (en) |
| MX (1) | MXPA03004171A (en) |
| WO (1) | WO2002039561A2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103548226A (en) * | 2011-02-28 | 2014-01-29 | Sma太阳能技术股份公司 | Method and system for detecting an arc fault in a power circuit |
| CN103875144A (en) * | 2011-10-14 | 2014-06-18 | Sma太阳能技术股份公司 | Method and apparatus for detecting an arc in a DC circuit |
| CN105765812A (en) * | 2013-11-22 | 2016-07-13 | 通用电气航空***有限公司 | Method for detecting electrical faults in a circuit |
| CN107534285A (en) * | 2015-03-25 | 2018-01-02 | 赛峰电气与电源公司 | Electric network protection method and apparatus |
| CN111398750A (en) * | 2020-03-30 | 2020-07-10 | 深圳供电局有限公司 | Arc identification method and system for arc identification |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5524335B2 (en) | 2009-07-23 | 2014-06-18 | エンフェイズ エナジー インコーポレイテッド | Method and apparatus for detecting and controlling DC arc faults |
| EP3041104B1 (en) | 2013-08-26 | 2021-06-02 | Mitsubishi Electric Corporation | Dc power generation system and protection method for dc power generation system |
| DE102014102352A1 (en) * | 2014-02-24 | 2015-08-27 | Ge Energy Power Conversion Technology Limited | Battery storage system with arc fault protection, energy conversion system and protection method |
| US9748762B2 (en) * | 2014-03-21 | 2017-08-29 | Abb Schweiz Ag | Method and apparatus for the protection of DC distribution systems |
| JP2016082682A (en) * | 2014-10-15 | 2016-05-16 | 株式会社オートネットワーク技術研究所 | Energization control device and energization control method |
| US9837809B2 (en) | 2015-05-27 | 2017-12-05 | Korea Institute Of Energy Research | Arc detection apparatus, arc detecting method, and power system |
| CN105790236B (en) * | 2016-04-19 | 2018-03-13 | 南京南瑞继保电气有限公司 | A kind of DC current cutoff device and its control method |
| KR102368180B1 (en) | 2020-02-14 | 2022-03-02 | 한국에너지기술연구원 | Arc detection method and apparatus using variation of magnitude by frequency |
| EP4138241A1 (en) * | 2021-08-17 | 2023-02-22 | DC Systems B.V. | A protection circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5369366A (en) * | 1993-02-12 | 1994-11-29 | Cable Repair Systems Corporation | Method of finding faults in a branched electrical distribution circuit |
| US5584974A (en) * | 1995-10-20 | 1996-12-17 | Eni | Arc control and switching element protection for pulsed dc cathode sputtering power supply |
-
2001
- 2001-11-09 AU AU2002230649A patent/AU2002230649A1/en not_active Abandoned
- 2001-11-09 CN CNA01818720XA patent/CN1529929A/en active Pending
- 2001-11-09 KR KR10-2003-7006498A patent/KR20040028684A/en not_active Application Discontinuation
- 2001-11-09 CA CA002426901A patent/CA2426901A1/en not_active Abandoned
- 2001-11-09 WO PCT/US2001/046929 patent/WO2002039561A2/en active Search and Examination
- 2001-11-09 MX MXPA03004171A patent/MXPA03004171A/en active IP Right Grant
- 2001-11-09 JP JP2002541770A patent/JP3864381B2/en not_active Expired - Fee Related
- 2001-11-09 EP EP01990886A patent/EP1428303A2/en not_active Withdrawn
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103548226A (en) * | 2011-02-28 | 2014-01-29 | Sma太阳能技术股份公司 | Method and system for detecting an arc fault in a power circuit |
| US9136688B2 (en) | 2011-02-28 | 2015-09-15 | Sma Solar Technology Ag | Method and system for detecting an arc fault in a power circuit |
| CN103548226B (en) * | 2011-02-28 | 2015-12-02 | Sma太阳能技术股份公司 | For the method and system of arc fault in testing circuit |
| CN103875144A (en) * | 2011-10-14 | 2014-06-18 | Sma太阳能技术股份公司 | Method and apparatus for detecting an arc in a DC circuit |
| CN103875144B (en) * | 2011-10-14 | 2016-04-13 | Sma太阳能技术股份公司 | For detecting the method and apparatus of the electric arc in DC circuit |
| CN105765812A (en) * | 2013-11-22 | 2016-07-13 | 通用电气航空***有限公司 | Method for detecting electrical faults in a circuit |
| CN105765812B (en) * | 2013-11-22 | 2018-11-20 | 通用电气航空***有限公司 | Method for the electric fault in detection circuit |
| CN107534285A (en) * | 2015-03-25 | 2018-01-02 | 赛峰电气与电源公司 | Electric network protection method and apparatus |
| CN107534285B (en) * | 2015-03-25 | 2019-08-13 | 赛峰电气与电源公司 | Electric network protection method and apparatus |
| CN111398750A (en) * | 2020-03-30 | 2020-07-10 | 深圳供电局有限公司 | Arc identification method and system for arc identification |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2002039561A2 (en) | 2002-05-16 |
| AU2002230649A1 (en) | 2002-05-21 |
| CA2426901A1 (en) | 2002-05-16 |
| MXPA03004171A (en) | 2003-09-22 |
| WO2002039561A3 (en) | 2004-04-01 |
| JP2005503743A (en) | 2005-02-03 |
| JP3864381B2 (en) | 2006-12-27 |
| KR20040028684A (en) | 2004-04-03 |
| EP1428303A2 (en) | 2004-06-16 |
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