CN203117308U - High-power electrical appliance arc fault detection system - Google Patents
High-power electrical appliance arc fault detection system Download PDFInfo
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- CN203117308U CN203117308U CN 201220642575 CN201220642575U CN203117308U CN 203117308 U CN203117308 U CN 203117308U CN 201220642575 CN201220642575 CN 201220642575 CN 201220642575 U CN201220642575 U CN 201220642575U CN 203117308 U CN203117308 U CN 203117308U
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Abstract
The utility model relates to the low-voltage power distribution system arc fault detection field and especially relates to a high-power electrical appliance arc fault detection system. The system comprises a current signal transformer, an operational amplifier precision rectification circuit, a comparison circuit, a voltage follower circuit and a single-chip microcomputer system. The single-chip microcomputer system comprises a main program, a timer interruption program and an arc judgment program. The timer interruption program is provided with a high level time length threshold value interval and is used to capture a high level time length of a rectangular pulse signal in an on-line state and determine the number of arc half wave generation according to the high level time length. The arc judgment program carries out statistics on the arc half wave generation number and takes the number as a criterion for identifying the generation of an arc fault event. When the arc half wave number is greater than or equal to a certain quantity, the generation of one arc fault event is determined. The detection system can accurately determine the generation of the high-power electrical appliance arc fault and tripping is performed so that a circuit is disconnected. A guarantee is provided for electrical safety of the high-power electrical appliance.
Description
Technical field
The utility model relates to low-voltage distribution system arc fault detection field, relates in particular to a kind of system for detection of the high-power electric appliance arc fault.
Background technology
Along with Chinese economic development, the rapid increase of residential electricity consumption load adds reasons such as aging circuit, and electrical fire takes place again and again.According to the interrelated data statistics, the fire that causes because of electric reason ranks first in all kinds of fire, accounts for 30%.And the very big proportion of electrical fire is owing to arc fault causes.These dangerous electric arcs may occur in the unreasonable or aging supply line of design, in appliance plug and the power lead of household electrical appliance, inner wire harness or the parts insulation.The characteristics of fault electric arc are that electric current may reduce in the circuit, but the temperature height, and fault is enlarged rapidly, the initiation fire until lighting near combustible.So prevent this fire by the arc fault initiation particularly important.
Traditional overcurrent protection isolating switch and residual current protecting isolating switch extensively adopt, but it does not have the effect of fault electric arc protection in some occasions.At present domestic domestic circuit arc fault field also is in the research and development stage, though being arranged, fewer companies developed arc-fault circuit interrupter at domestic circuit, but it does not also really begin in circulation on the market, and its reliability is also well verified as yet.
The external understanding that endangers for electric arc early; to the research starting morning of arc fault detection; the U.S. is selling on the market at the family expenses arc-fault circuit interrupter of 120V/60Hz; and the branch road that national electrical equipment regulations (NEC) required all to install in the bedroom in 2002; all the arc-fault circuit interrupter that decree is listed to be installed, with protection whole piece branch road.LCDI and AFCI protective device that the room air conditioner that 2002 national electric regulations also require the single phase poaer supply line to add the plug connection need have factory to install.After 1 day August in 2004, the family expenses high-power electric appliance of selling at American market requires to be with the attaching plug with AFCI function.
Though China this series products do not occurred on the market at the also not mandatory requirement installation of electric arc fault protection device of high-power electric appliance plug yet at present.But in order to protect the Electrical Safety of high-power electric appliance, as air-conditioning etc., adding high-power electric appliance that plug connects at the single phase poaer supply line of China 240V/50Hz, to design a volume little, is convenient to install and effectively provides the device of electric arc fault protection to be necessary.Installation for the high-power electric appliance arc-fault circuit interrupter also is a kind of inexorable trend that China guarantees Electrical Safety in the future.
The utility model content
For addressing the above problem, the utility model provides a kind of high-power electric appliance arc fault detection systems, it is characterized in that: comprise
The current signal mutual inductor is used for obtaining the current signal of electrical equipment as the signal source of arc fault detection;
The amplifier precise rectification circuit is used for current signal is shaped to positive pulse signal;
Comparator circuit is used for positive pulse signal is shaped to rectangular pulse signal;
Voltage follower circuit is used for the impedance of coupling backing system and Single Chip Microcomputer (SCM) system, and the influence before and after isolating between the level makes Single Chip Microcomputer (SCM) system can obtain correct rectangular pulse signal;
Single Chip Microcomputer (SCM) system, described Single Chip Microcomputer (SCM) system comprise master routine, timer interrupt program and electric arc determining program,
Described timer interrupt program arranges high level time length threshold values interval, is used for online high level time length of catching rectangular pulse signal, and judges the number that the electric arc half-wave takes place according to high level time length;
Described electric arc determining program, statistics electric arc half-wave generation number be as the criterion of the generation of identification arc fault event, when electric arc half-wave number during more than or equal to some, is judged to be an arc fault event and takes place.
Further, the current signal mutual inductor is gathered the current signal of the one-period of 240V/50Hz alternating current.
Further, positive pulse signal relatively export high level when signal is setting value, otherwise output low level both had been shaped to rectangular pulse signal by single limit comparator circuit.
Further, timer interrupt program arranges five high level time length threshold intervals in Single Chip Microcomputer (SCM) system, respectively corresponding judge do not have the electric arc half-wave to take place, electric arc half-wave takes place, two electric arc half-waves take place, three electric arc half-waves take place, the shake of square-wave pulse is disturbed; Described electric arc determining program, Single Chip Microcomputer (SCM) system calculate the interval total number of electric arc half-wave that takes place of the inherent high level length threshold values of 0.5s, and total number takes place the electric arc half-wave judges that more than or equal to 8 an arc fault event takes place.
Further, square-wave pulse is set in the Single Chip Microcomputer (SCM) system changes the threshold values interval, after an electric arc accident barrier part takes place, Single Chip Microcomputer (SCM) system is changed to second criterion with the square-wave pulse in the time of arc fault event generation, and Single Chip Microcomputer (SCM) system provides trip signal, disconnecting circuit when square-wave pulse variation accumulated value exceeds the threshold values interval.
The groundwork flow process of above-mentioned arc fault detection systems is as follows:
Step 5, during Single Chip Microcomputer (SCM) system is logical high level time length threshold values interval is set, judge the number that the electric arc half-wave takes place according to high level time length, statistics electric arc half-wave generation number is as the criterion of the generation of identification arc fault event, when electric arc half-wave number during more than or equal to some, be judged to be an arc fault event and take place.
The utlity model has following beneficial effect:
The utility model obtains to be equipped with high-power electric appliance branch road inlet wire current by current transformer, through the amplifier rectification circuit, behind the comparator circuit, form rectangular wave pulse, catch this signal by Single Chip Microcomputer (SCM) system, and the high level time length of this signal detected judgement, thereby the generation of judging the arc fault event whether.This kind Circuits System is judged in conjunction with the fault electric arc model parameter by current signal, enough generations of accurately judging the high-power electric appliance arc fault, avoid erroneous judgement, improved the reliability of fault detect, and threaded off and cut off circuit, for the high-power electric appliance Electrical Safety provides safeguard, it is little to have volume simultaneously, is fit to be installed on the advantage of high-power electric appliance plugs and sockets.
Description of drawings
Below in conjunction with accompanying drawing the utility model is described in further detail.
Fig. 1 is the utility model embodiment high-power electric appliance arc fault detection systems synoptic diagram.
Fig. 2 is the utility model embodiment Single Chip Microcomputer (SCM) system master routine synoptic diagram.
Fig. 3 is the utility model embodiment Single Chip Microcomputer (SCM) system timer TIM1 interrupt routine synoptic diagram.
Fig. 4 is the utility model embodiment Single Chip Microcomputer (SCM) system timer TIM2 interrupt routine synoptic diagram.
Fig. 5 is the utility model embodiment Single Chip Microcomputer (SCM) system electric arc determining program synoptic diagram.
Embodiment
In order better to understand the technical solution of the utility model, describe the embodiment that the utility model provides in detail below in conjunction with accompanying drawing.
A kind of high-power electric appliance arc fault detection systems, with reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4, shown in Figure 5, be applicable on the family expenses high-power electric appliance, described high-power electric appliance arc fault detection circuit comprises current signal sensor 1, amplifier rectification circuit 2,555 comparator circuits 3, voltage follower 4, Single Chip Microcomputer (SCM) system 5, Single Chip Microcomputer (SCM) system 5 comprises master routine, timer interrupt program, electric arc determining program three parts
Current signal mutual inductor 1, the current signal of the one-period of collection 240V/50Hz alternating current is as the signal source of arc fault detection;
Amplifier precise rectification circuit 2 is used for current signal is shaped to positive pulse signal;
Single Chip Microcomputer (SCM) system 5, described Single Chip Microcomputer (SCM) system comprises timer interrupt program and electric arc determining program, described timer interrupt program, high level time length threshold values interval is set, be used for online high level time length of catching rectangular pulse signal, and judge the number that the electric arc half-wave takes place according to high level time length, described electric arc determining program, statistics electric arc half-wave generation number is as the criterion of the generation of identification arc fault event, when electric arc half-wave number during more than or equal to some, be judged to be an arc fault event and take place.
Five high level time length threshold intervals are set in Single Chip Microcomputer (SCM) system, respectively corresponding judge do not have the electric arc half-wave to take place, electric arc half-wave takes place, two electric arc half-waves take place, three electric arc half-waves take place, the shake of square-wave pulse is disturbed; Described electric arc determining program, Single Chip Microcomputer (SCM) system calculate the interval total number of electric arc half-wave that takes place of the inherent high level length threshold values of 0.5s, and total number takes place the electric arc half-wave judges that more than or equal to 8 an arc fault event takes place.Timer interrupt program, also be provided with square-wave pulse and change the threshold values interval, described electric arc determining program, after an electric arc accident barrier part takes place, the accumulated value that square-wave pulse in the time that Single Chip Microcomputer (SCM) system calculating arc fault event takes place changes is second criterion, and Single Chip Microcomputer (SCM) system provides trip signal, disconnecting circuit when square-wave pulse variation accumulated value exceeds the threshold values interval.
The program operational scheme of Single Chip Microcomputer (SCM) system 5 is as follows:
1. be configured to the input of PWM pattern to timer TIM1, TIM2 initialization and with timer TIM1 in the master routine, timer TIM2 is configured to regularly 10ms, and program is in while circular wait interruption status then;
2. when TIM1 captures the negative edge interruption, extract the high level time length in the register, set five high level time length threshold intervals, respectively corresponding these five threshold intervals of measured high level time length, single-chip microcomputer can disturb the shake that this high level is judged to be the generation that do not have the generation of electric arc half-wave, the generation of an electric arc half-wave, the generation of two electric arc half-waves, three electric arc half-waves or square-wave pulse respectively, with variables A rc_num be storage 10ms can the electric arc number, and putting 1 with variable f, to represent that TIM1 interrupts effective;
3. arrive when the TIM2 10ms time regularly, enter interruption and to defined length be the electric arc number situation that writes current generation in 50 the integer array, and to electric arc half-wave sum statistics and the judgement that takes place in the 0.5s, after satisfying eight half-waves, enter second criterion, just be judged as arc fault if satisfy the condition of second criterion, namely arc-detection is made action response at last, last zero clearing variable f;
4. in the electric arc determining program, define a length and be 50 structure array ArcRecord[50], regularly interrupt every 10ms high 49 numbers of structure being moved to low 49 numbers, when not having the electric arc half-wave to take place to number ArcRecord[49] in ArcNum member write 0, write pulse change to ArcRate member; When electric arc half-wave takes place to number ArcNum[0] in write 1, write pulse change to ArcRate member; When two electric arc half-waves take place to number ArcRecord[49], ArcRecord[48] in write 1 respectively, write pulse change to ArcRate member; When three electric arc half-waves take place to number ArcRecord[47], ArcRecord[48], ArcRecord[49] write 1 respectively, when be the shake interference of square-wave pulse, program is left intact.And then computation structure body ArcRate[50] ArcNum member's numerical value summation, it is electric arc number summation, when summation preliminary judgement more than or equal to eight time is the generation of an arc fault event, further ask for the numerical value summation of ArcRate member in the structure then, when this rate of change exceeds threshold value, single-chip microcomputer provides trip signal, disconnecting circuit.
The above, it only is the utility model preferred embodiment, so can not limit the scope that the utility model is implemented with this, i.e. the equivalence of doing according to the utility model claim and description changes and modifies, and all should still belong in the scope that the utility model patent contains.
Claims (1)
1. a high-power electric appliance arc fault detection systems is characterized in that: comprise
The current signal mutual inductor is used for obtaining the current signal of electrical equipment as the signal source of arc fault detection;
The amplifier precise rectification circuit is used for current signal is shaped to positive pulse signal;
Comparator circuit is used for positive pulse signal is shaped to rectangular pulse signal;
Voltage follower circuit is used for the impedance of coupling backing system and Single Chip Microcomputer (SCM) system, and the influence before and after isolating between the level makes Single Chip Microcomputer (SCM) system can obtain correct rectangular pulse signal;
Single Chip Microcomputer (SCM) system is used for judging the number of electric arc half-wave generation, and adds up the generation of electric arc half-wave generation number identification arc fault event.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220642575 CN203117308U (en) | 2012-11-28 | 2012-11-28 | High-power electrical appliance arc fault detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220642575 CN203117308U (en) | 2012-11-28 | 2012-11-28 | High-power electrical appliance arc fault detection system |
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| CN203117308U true CN203117308U (en) | 2013-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220642575 Expired - Lifetime CN203117308U (en) | 2012-11-28 | 2012-11-28 | High-power electrical appliance arc fault detection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103645396A (en) * | 2013-11-25 | 2014-03-19 | 泉州市嘉凯机电科技有限公司 | Method and device for low-voltage arc fault detection |
| CN105067931A (en) * | 2015-08-19 | 2015-11-18 | 珠海格力电器股份有限公司 | Series fault arc detection circuit |
-
2012
- 2012-11-28 CN CN 201220642575 patent/CN203117308U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103645396A (en) * | 2013-11-25 | 2014-03-19 | 泉州市嘉凯机电科技有限公司 | Method and device for low-voltage arc fault detection |
| CN103645396B (en) * | 2013-11-25 | 2018-03-09 | 泉州市嘉凯机电科技有限公司 | Low-voltage arc fault detection method and device |
| CN105067931A (en) * | 2015-08-19 | 2015-11-18 | 珠海格力电器股份有限公司 | Series fault arc detection circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130807 |
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| CX01 | Expiry of patent term |