CN1248000C - Fault arc current detection circuit - Google Patents
Fault arc current detection circuit Download PDFInfo
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- CN1248000C CN1248000C CN 01132793 CN01132793A CN1248000C CN 1248000 C CN1248000 C CN 1248000C CN 01132793 CN01132793 CN 01132793 CN 01132793 A CN01132793 A CN 01132793A CN 1248000 C CN1248000 C CN 1248000C
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Abstract
The present invention relates to a failure arc current detection circuit for a failure arc current protector, which is mainly used for the failure arc current detection for a failure electric arc protector of low voltage lines. The present invention can detect the failure arc current generated between phase lines and neutral lines (middle lines), the failure arc current generated between phase lines and ground lines, and the failure arc current generated between phase lines and phase lines; the failure arc current detection circuit is composed of a voltage sample circuit, a current sample circuit, an arc detection control circuit and a monolithic computer processor. The present invention is characterized in that the output terminal of a current mutual inductor is directly connected with the input terminals of the current sample circuit and the arc detection control circuit; three input terminals of a monolithic computer are respectively connected with the output terminals of the voltage sample circuit, the current sample circuit and the arc detection control circuit; the monolithic computer has two paths of output terminals, wherein on path of the output terminal is connected with the switching control terminal of the arc detection control circuit, and the other path of the output terminal is used as an output control terminal. During detection, the failure arc current detection circuit is not affected by loop working current and the power carrier communication frequency in lines; the present invention has the characteristics of small size, strong anti-interference ability and high sensitivity.
Description
Affiliated technical field:
The invention belongs to the electronic technology class, relate generally to the method that fault arc current detects in the low-voltage circuit.
Background technology:
In the product of low-voltage electrical protection at present; mainly contain short circuit overload protective device, earth leakage protective device, overvoltage protection device; more than various protectors; when producing fault electric arc between phase line and the neutral line (or center line), phase line and ground wire, phase line and phase line, the neutral line (or center line) and ground wire; disengagement failure circuit rapidly; caused many fire, study it is because the fault arc current of low-voltage circuit is difficult for effectively detecting, although United States Patent (USP) has been announced at all
6255923 July 3， 2001 Mason
6218844 April 17， 2001 Wong
5835321 November 10， 1998 Elms
5121282 June 9， 1992 White
6144537 November 7， 2000 Bovember
6242922 June 5， 2001 Daum
6195241 February 27， 2001 Brooks
6275044 August 14， 2001 Scott
6248970 June 19， 2001 Dimarco
6262871 July 17， 2001 Nemir
Various low-voltage electrical fault electric arc protectors can detect the arc current of circuit; but poor anti jamming capability; particularly be subjected to the working current of circuit to influence bigger; when line work electric current during greater than certain value; then the easy flase drop of the fault arc current detection circuit of protector produces malfunction; at present; the testing circuit of above-mentioned various protectors also can only detect the arc current that is lower than the 20A loop; for working current greater than the circuit more than the 20A; the detection of arc current is just very difficult, thereby just can not effectively prevent the fire that circuit is caused by fault electric arc.
Summary of the invention:
The object of the present invention is to provide a kind of; dealing with utensil by single-chip microcomputer has volume little; antijamming capability is strong; the testing circuit of highly sensitive fault electric arc protector; this fault arc current detection circuit can effectively detect the fault arc current in the low-voltage circuit; when detecting, be not subjected to the loop works current affects; be not subjected to the influence of power line carrier, PLC frequency in the circuit yet; this fault arc current detection circuit is assemblied in makes to detect electric arc usefulness in the isolating switch; can detect the fault arc current that produces between the phase line and the neutral line (or center line); can detect the fault arc current that produces between phase line and ground wire; can detect the fault arc current that produces between phase line and phase line; can detect the fault arc current that produces between the neutral line (or center line) and ground wire, can be operated on the loop of any electric power system of low-voltage circuit.
Description of drawings:
Fig. 1 is the technical characterictic figure of fault arc current detection circuit, be made up of Figure 100, Figure 200, Figure 30 0 Figure 40 0, Figure 100 is the general name of voltage sample circuit, and Figure 200 is the general name of current sampling circuit, Figure 30 0 is the general name of arc-detection control circuit, and Figure 40 0 is the general name of processor of single chip computer.
The scheme 1 of the voltage sample circuit that Figure 101 is made up of electric capacity, diode, resistance.
The scheme 2 of the voltage sample circuit that Figure 102 is made up of transformer, diode, resistance.
The scheme 3 of the voltage sample circuit that Figure 103 is made up of resistance, diode, resistance.
Figure 20 1 forms the symmetrical expression cascode by transistor---the scheme 1 of the current sampling circuit of cascode configuration.
Figure 20 2 forms the symmetrical expression common source by field effect transistor---the scheme 2 of the current sampling circuit of cascode configuration.
Figure 20 3 is made of the scheme 3 of the current sampling circuit of symmetrical expression voltage comparator operational amplifier.
Figure 20 4 is made of the scheme 4 of the current sampling circuit of single-stage total radio amplifier transistor.
Figure 20 5 is made of the scheme 5 of the current sampling circuit of single-stage common source amplifying circuit field effect transistor.
Figure 20 6 is made of the scheme 6 of the current sampling circuit of voltage comparator operational amplifier.
Figure 30 1 forms the symmetrical expression cascode by transistor---be in series with the scheme 1 of the arc-detection control circuit of switch in the total radio amplifier.
Figure 30 2 forms the symmetrical expression cascode by transistor---be parallel with the scheme 2 of the arc-detection control circuit of switch in the total radio amplifier.
Figure 30 3 forms the symmetrical expression common source by field effect transistor---be in series with the scheme 3 of the arc-detection control circuit of switch in the total radio amplifier.
Figure 30 4 forms the symmetrical expression common source by field effect transistor---be parallel with the scheme 5 of the arc-detection control circuit of switch in the total radio amplifier.
Figure 30 5 is made of the scheme 5 of the arc-detection control circuit of paralleling switch in the symmetrical expression voltage comparator operational amplifier.
Figure 30 6 is the scheme 6 of the transistor cascode amplification control circuit of arc-detection control circuit.
Figure 30 7 is the scheme 7 of the field effect transistor amplification control circuit of arc-detection control circuit.
Figure 30 8 is the scheme 8 that the operational amplifier of arc-detection control circuit constitutes amplification control circuit.
Fig. 2 is single-phase fault electric arc isolating switch embodiment 1 a circuit working schematic diagram.
Fig. 3 is single-phase fault electric arc isolating switch embodiment 2 circuit working schematic diagrams.
Fig. 4 is single-phase fault electric arc isolating switch embodiment 3 circuit working schematic diagrams.
Fig. 5 is single-phase fault electric arc isolating switch embodiment 4 circuit working schematic diagrams.
Fig. 6 is single-phase fault electric arc isolating switch embodiment 5 circuit working schematic diagrams.
Fig. 7 is single-phase fault electric arc isolating switch embodiment 6 circuit working schematic diagrams.
Fig. 8 is three-phase four-wire system fault electric arc isolating switch embodiment 7 circuit working schematic diagrams.
Fig. 9 is three-phase three-wire system fault electric arc isolating switch embodiment 8 circuit working schematic diagrams.
Figure 10 is single-phase three-wire fault electric arc isolating switch embodiment 9 circuit working schematic diagrams.
Embodiment:
In conjunction with shown in Figure 1, further specify, fault arc current detection circuit of the present invention, its ingredient is made up of voltage sample circuit 100, current sampling circuit 200, arc-detection control circuit 300, processor of single chip computer 400, its technical characterictic is directly to be connected the input end of current sampling circuit 200 and arc-detection control circuit 300 by the output terminal of current transformer; Three input ends of single-chip microcomputer 400 are connected to the output terminal of voltage sample circuit 100, current sampling circuit 200, arc-detection control circuit 300, the two-way output terminal of single-chip microcomputer 400, one the tunnel is connected the switch control end of arc-detection control circuit 300, and another road is as output control terminal; The input signal of voltage sample circuit 100 comes from power network line voltage.
Shown in Figure 101,102,103, further specify, originally be stated as circuit 101 schemes of the voltage sample circuit 100 of fault arc current detection circuit, this circuit 101, is exported behind the anodal series diode D15 of bridge rectifier circuit as power supply as the sampling voltage output terminal simultaneously by capacitor C 11 step-down bridge type rectification D11-D14 resistance R 11, R12 dividing potential drop; Circuit 102 schemes of voltage sample circuit 100, this circuit 102, are exported behind the anodal series diode D15 of bridge rectifier circuit as power supply as the sampling voltage output terminal simultaneously by transformer L step-down bridge type rectification D11-D14 resistance R 11, R12 dividing potential drop; Circuit 103 schemes of voltage sample circuit 100, this circuit 103 by resistance R 11 buck diode D15 half-wave transformation resistance R12 dividing potential drops as the sampling voltage output terminal, simultaneously by capacitor C 11 step-down bridge type rectification D11-D14 circuit as out-put supply, input signal and output signal transmitted waveform according to voltage sample circuit 100 are analyzed, and are the circuit that converts all-wave or half-wave or square wave after the alternating voltage step-down to power network line to.
Shown in Figure 20 1,202,203,204,205,206, further specify, originally be stated as circuit 201 schemes of the current sampling circuit 200 of fault arc current detection circuit, this circuit 201 is formed symmetrical expression cascode---total radio amplifier by capacitor C 21, C22 resistance R 21---R29 triode NPN Q21, Q23 and triode PNP Q22, Q24, and the shared pull-up resistor R29 of the output of its two-way amplifying circuit is as output terminal; Circuit 202 schemes of current sampling circuit 200, this circuit 202 is formed symmetrical expression common source---total radio amplifier by capacitor C 21, C22 resistance R 21---R29 field effect transistor T21, T22 and triode PNP Q21, Q22, and the shared pull-up resistor R29 of the output of its two-way amplifying circuit is as output terminal; Circuit 203 schemes of current sampling circuit 200; This circuit 203 is formed the symmetrical expression voltage comparator by resistance R 21-R25 and operational amplifier, and the shared pull-up resistor R25 of the output of its two-way amplifying circuit is as output terminal; Circuit 204 schemes of current sampling circuit 200, this circuit 204 by capacitor C 21 resistance R 21---R23 triode Q21, form total radio amplifier; Circuit 205 schemes of current sampling circuit 200, this circuit 205 is formed the common source amplifying circuit by capacitor C 21 resistance R 21---R23 and field effect transistor T21; Circuit 206 schemes of current sampling circuit 200, this circuit 206 is formed voltage comparator by resistance R 21-R23 and operational amplifier, input signal and output signal transmitted waveform according to current sampling circuit 200 are analyzed, and are the circuit that the AC signal of current transformer output terminal is converted to all-wave or half-wave or square wave.
In conjunction with Figure 30 1,302,303,304,305,306,307, shown in 308, further specify, originally be stated as the circuit 301 of the arc-detection control circuit 300 of fault arc current detection circuit, 302 schemes, this circuit 301,302 by capacitor C 31, C32 resistance R 31---R39 triode NPN Q31, Q33 and triode PNP Q32, Q34 forms symmetrical expression cascode---total radio amplifier, the shared pull-up resistor R39 of the output of its two-way amplifying circuit is as output terminal, and at input circuit tandem tap K41, K42 Figure 30 1 or paralleling switch K41, the circuit of K42 Figure 30 2; The circuit 303 of arc-detection control circuit 300,304 schemes, this circuit 303,304 form symmetrical expression common source---total radio amplifier by capacitor C 31, C32 resistance R 31---R39 field effect transistor T31, T32 and triode Q31, Q32, the shared pull-up resistor R39 of the output of its two-way amplifying circuit is as output terminal, and at the circuit of input circuit tandem tap K41, K42 Figure 30 3 or paralleling switch K41, K42 Figure 30 4; Circuit 305 schemes of arc-detection control circuit 300, this circuit 305 by resistance R 30-34 and operational amplifier form symmetrical expression voltage comparator input end paralleling switch K41,, the circuit 305 of K42; Circuit 306 schemes of arc-detection control circuit 300, this circuit 306 are made of the circuit of single-stage total radio amplifier input circuit tandem tap K41 capacitor C 31 resistance R 31-R33 and transistor Q31; Circuit 307 schemes of arc-detection control circuit 300, this circuit 307 are made of the circuit of common source amplifying circuit input circuit tandem tap K41 capacitor C 31 resistance R 31---R33 and field effect transistor T31; Circuit 308 schemes of arc-detection control circuit 300, this circuit 308 is made of the circuit of voltage comparator input end paralleling switch K41 capacitor C 31 resistance R 30---R32 and operational amplifier, input signal and output signal transmitted waveform according to arc-detection control circuit 300 are analyzed, be the AC signal to the current transformer output terminal, output converts the circuit of all-wave or half-wave or square wave under the effect that control is opened.
Shown in the Application Example 1 of Fig. 2 fault arc current detection circuit, further specify, originally be stated as the application of fault arc current detection circuit in single-phase fault electric arc isolating switch, this circuit is by voltage sample circuit 101, current sampling circuit 204, arc-detection control circuit 306, processor of single chip computer 400 is formed, its principle is the signal that is obtained by voltage sample circuit 101 and current sampling circuit 204, supplying with the single-chip microcomputer place handles, result according to the processing of single-chip microcomputer mileage preface, the detection whether decision opens arc-detection control circuit 306, if routine processes result is a fault arc current, then open the detection of arc-detection control circuit 306, simultaneously by single-chip microcomputer output control signal, make the isolating switch line disconnection, if routine processes result is a normal current, then do not open the detection of arc-detection control circuit 306, single-chip microcomputer is not exported control signal, not line disconnection of isolating switch simultaneously.
Shown in the Application Example 2 of Fig. 3 current detection circuit, further specify, originally be stated as the application of fault arc current detection circuit in single-phase fault electric arc isolating switch, this circuit is by voltage sample circuit 101, current sampling circuit 205, arc-detection control circuit 307, processor of single chip computer 400 is formed, its principle is the signal that is obtained by voltage sample circuit 101 and current sampling circuit 205, supplying with the single-chip microcomputer place handles, result according to the processing of single-chip microcomputer mileage preface, the detection whether decision opens arc-detection control circuit 307, if routine processes result is a fault arc current, then open the detection of arc-detection control circuit 307, simultaneously by single-chip microcomputer output control signal, make the isolating switch line disconnection, if routine processes result is a normal current, then do not open the detection of arc-detection control circuit 307, single-chip microcomputer is not exported control signal, not line disconnection of isolating switch simultaneously.
Shown in the Application Example 3 of Fig. 4 current detection circuit, further specify, originally be stated as the application of fault arc current detection circuit in single-phase fault electric arc isolating switch, this circuit is by voltage sample circuit 103, current sampling circuit 206, arc-detection control circuit 308, processor of single chip computer 400 is formed, its principle is the signal that is obtained by voltage sample circuit 103 and current sampling circuit 206, supplying with the single-chip microcomputer place handles, result according to the processing of single-chip microcomputer mileage preface, the detection whether decision opens arc-detection control circuit 308, if routine processes result is a fault arc current, then open the detection of arc-detection control circuit 308, simultaneously by single-chip microcomputer output control signal, make the isolating switch line disconnection, if routine processes result is a normal current, then do not open the detection of arc-detection control circuit 308, single-chip microcomputer is not exported control signal, not line disconnection of isolating switch simultaneously.
Shown in the Application Example 4 of Fig. 5 current detection circuit, further specify, originally be stated as the application of fault arc current detection circuit in single-phase fault electric arc isolating switch, this circuit is by voltage sample circuit 101, current sampling circuit 203, arc-detection control circuit 305, processor of single chip computer 400 is formed, its principle is the signal that is obtained by voltage sample circuit 101 and current sampling circuit 203, supplying with the single-chip microcomputer place handles, result according to the processing of single-chip microcomputer mileage preface, the detection whether decision opens arc-detection control circuit 305, if routine processes result is a fault arc current, then open the detection of arc-detection control circuit 305, simultaneously by single-chip microcomputer output control signal, make the isolating switch line disconnection, if routine processes result is a normal current, then do not open the detection of arc-detection control circuit 305, single-chip microcomputer is not exported control signal, not line disconnection of isolating switch simultaneously.
Shown in the Application Example 5 of Fig. 6 current detection circuit, further specify, originally be stated as the application of fault arc current detection circuit in single-phase fault electric arc isolating switch, this circuit is by voltage sample circuit 101, current sampling circuit 201, arc-detection control circuit 301, processor of single chip computer 400 is formed, its principle is the signal that is obtained by voltage sample circuit 101 and current sampling circuit 201, supplying with the single-chip microcomputer place handles, result according to the processing of single-chip microcomputer mileage preface, the detection whether decision opens arc-detection control circuit 301, if routine processes result is a fault arc current, then open the detection of arc-detection control circuit 301, simultaneously by single-chip microcomputer output control signal, make the isolating switch line disconnection, if routine processes result is a normal current, then do not open the detection of arc-detection control circuit 301, single-chip microcomputer is not exported control signal, not line disconnection of isolating switch simultaneously.
Shown in the Application Example 6 of Fig. 7 current detection circuit, further specify, originally be stated as the application of fault arc current detection circuit in single-phase fault electric arc isolating switch, this circuit is by voltage sample circuit 102, current sampling circuit 202, arc-detection control circuit 303, processor of single chip computer 400 is formed, its principle is the signal that is obtained by voltage sample circuit 102 and current sampling circuit 202, supplying with the single-chip microcomputer place handles, result according to the processing of single-chip microcomputer mileage preface, the detection whether decision opens arc-detection control circuit 303, if routine processes result is a fault arc current, then open the detection of arc-detection control circuit 303, simultaneously by single-chip microcomputer output control signal, make the isolating switch line disconnection, if routine processes result is a normal current, then do not open the detection of arc-detection control circuit 303, single-chip microcomputer is not exported control signal, not line disconnection of isolating switch simultaneously.
Shown in the Application Example 7 of Fig. 8 current detection circuit, further specify, originally be stated as the application of fault arc current detection circuit in three-phase four-wire system fault electric arc isolating switch, this circuit is by voltage sample circuit 101, current sampling circuit 201, arc-detection control circuit 301, processor of single chip computer 400 is formed, its principle is the signal that is obtained by voltage sample circuit 101 and current sampling circuit 201, supplying with the single-chip microcomputer place handles, result according to the processing of single-chip microcomputer mileage preface, the detection whether decision opens arc-detection control circuit 301, if routine processes result is a fault arc current, then open the detection of arc-detection control circuit 301, simultaneously by single-chip microcomputer output control signal, make the isolating switch line disconnection, if routine processes result is a normal current, then do not open the detection of arc-detection control circuit 307, single-chip microcomputer is not exported control signal, not line disconnection of isolating switch simultaneously.
Shown in the Application Example 8 of Fig. 9 current detection circuit, further specify, originally be stated as the application of fault arc current detection circuit in three-phase three-wire system fault electric arc isolating switch, this circuit is by voltage sample circuit 101, current sampling circuit 201, arc-detection control circuit 301, processor of single chip computer 400 is formed, its principle is the signal that is obtained by voltage sample circuit 101 and current sampling circuit 201, supplying with the single-chip microcomputer place handles, result according to the processing of single-chip microcomputer mileage preface, the detection whether decision opens arc-detection control circuit 301, if routine processes result is a fault arc current, then open the detection of arc-detection control circuit 301, simultaneously by single-chip microcomputer output control signal, make the isolating switch line disconnection, if routine processes result is a normal current, then do not open the detection of arc-detection control circuit 301, single-chip microcomputer is not exported control signal, not line disconnection of isolating switch simultaneously.
Shown in the Application Example 9 of Figure 10 current detection circuit, further specify, originally be stated as the application of fault arc current detection circuit in single-phase three wire system fault electric arc isolating switch, this circuit is by voltage sample circuit 101, current sampling circuit 201, arc-detection control circuit 301, processor of single chip computer 400 is formed, its principle is the signal that is obtained by voltage sample circuit 101 and current sampling circuit 201, supplying with the single-chip microcomputer place handles, result according to the processing of single-chip microcomputer mileage preface, the detection whether decision opens arc-detection control circuit 301, if routine processes result is a fault arc current, then open the detection of arc-detection control circuit 301, simultaneously by single-chip microcomputer output control signal, make the isolating switch line disconnection, if routine processes result is a normal current, then do not open the detection of arc-detection control circuit 301, single-chip microcomputer is not exported control signal, not line disconnection of isolating switch simultaneously.
In sum, the principle of work of this fault arc current detection circuit is, electric current in the power network line is handled by the secondary supply single-chip microcomputer place that directly offers of mutual inductor, after program in the single-chip microcomputer is handled input voltage and current signal, the detection that whether decision opens the arc-detection control circuit according to the result, if routine processes result is a fault arc current, then open the detection of arc-detection control circuit, simultaneously by single-chip microcomputer output control signal, make the isolating switch line disconnection,, then do not open the detection of arc-detection control circuit if the routine processes result is a normal current, single-chip microcomputer is not exported control signal, not line disconnection of isolating switch simultaneously.
Its characteristics are,
1, detects the fault arc current that produces between phase line and the neutral conductor (or center line).
2, produce fault arc current between detection phase line and ground wire.
3, produce fault arc current between detection phase line and phase line.
4, produce fault arc current between the detection neutral line (or center line) and ground wire.
Be not subjected to the restriction of line work electric current when 5, detecting arc current, promptly antijamming capability is strong.
Be not subjected to the restriction of arc current size when 6, detecting arc current, promptly highly sensitive.
7, this fault arc current detection circuit can be operated on the circuit of any electric power system of low-voltage circuit.
Claims (4)
1, a kind of fault arc current detection circuit, be by voltage sample circuit (100), current sampling circuit (200), arc-detection control circuit (300), processor of single chip computer (400) is formed, its technical characterictic is, directly be connected the input end of current sampling circuit (200) and arc-detection control circuit (300) by the output terminal of current transformer, three input ends of single-chip microcomputer (400) are connected to voltage sample circuit (100), current sampling circuit (200), the output terminal of arc-detection control circuit (300), the two-way output terminal of single-chip microcomputer (400), one the tunnel is connected the switch control end of arc-detection control circuit (300), another road is as output control terminal, and the input signal of voltage sample circuit (100) comes from power network line voltage.
2, fault arc current detection circuit according to claim 1, it is characterized in that voltage sample circuit (100) is formed (101) by capacity voltage dropping circuit, diode rectifier circuit, resistor voltage divider circuit or formed (102) or formed (103) by resistance drop volt circuit, diode half-wave translation circuit, resistor voltage divider circuit by transformer reduction voltage circuit, diode rectifier circuit, resistor voltage divider circuit.
3, fault arc current detection circuit according to claim 1,---total radio amplifier (201) or common source of forming by field effect transistor and the transistor---total radio amplifier (202) that it is characterized in that the symmetrical expression cascode that current sampling circuit (200) is made up of transistor or the symmetrical expression voltage comparator circuit of forming by operational amplifier (203) or the total radio amplifier of forming by transistor (204) or common source amplifying circuit of forming by field effect transistor (205) or the voltage comparator circuit of forming by operational amplifier (206).
4, fault arc current detection circuit according to claim 1,---the input circuit tandem tap (301) of total radio amplifier or the circuit of paralleling switch (302) or form symmetrical expression common source by field effect transistor---the input circuit tandem tap (303) of total radio amplifier or the circuit of paralleling switch (304) that it is characterized in that arc-detection control circuit (300) is formed the symmetrical expression cascode by transistor or form the circuit (305) of symmetrical expression voltage comparator input end paralleling switch or form the circuit (306) of single-stage total radio amplifier input circuit tandem tap or form the circuit (307) of common source amplifying circuit input circuit tandem tap or form the circuit (308) of the input end paralleling switch of voltage comparator by operational amplifier by field effect transistor by transistor by operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01132793 CN1248000C (en) | 2001-09-16 | 2001-09-16 | Fault arc current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01132793 CN1248000C (en) | 2001-09-16 | 2001-09-16 | Fault arc current detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1409122A CN1409122A (en) | 2003-04-09 |
| CN1248000C true CN1248000C (en) | 2006-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01132793 Expired - Fee Related CN1248000C (en) | 2001-09-16 | 2001-09-16 | Fault arc current detection circuit |
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| Country | Link |
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| CN (1) | CN1248000C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100461573C (en) * | 2003-12-26 | 2009-02-11 | 西安润辉科技发展有限公司 | Middle/low voltage bus short circuit protection method |
| US7349188B2 (en) * | 2005-06-06 | 2008-03-25 | Eaton Corporation | Arc fault detector responsive to patterns in interval to interval change in integrated sensed current values |
| CN100452598C (en) * | 2005-08-19 | 2009-01-14 | 珠海格力电器股份有限公司 | Protection circuit for fault electric arc, and method for detecting fault electric arc |
| CN101673934B (en) * | 2009-10-15 | 2012-01-11 | 王聪 | Serial arc-fault circuit interrupter and serial arc-fault protection method thereof |
| CN102288857B (en) * | 2011-05-18 | 2013-06-19 | 浙江科技学院 | Fault arc identification and detection method and detection protection device |
| FR2990322B1 (en) * | 2012-05-01 | 2016-09-09 | Ge Aviat Systems Ltd | DEVICE AND METHOD FOR DETECTING THE BEGINNING OF AN ELECTRIC ARC |
| CN102955090A (en) * | 2012-11-28 | 2013-03-06 | 华侨大学 | Electric arc fault detection method and circuit system for high-power household appliances |
| CN103376389B (en) * | 2013-07-30 | 2015-12-09 | 广东雅达电子股份有限公司 | A kind of fault electric arc for low-voltage circuit judges system and determination methods thereof |
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2001
- 2001-09-16 CN CN 01132793 patent/CN1248000C/en not_active Expired - Fee Related
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| CN1409122A (en) | 2003-04-09 |
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