CN104466905A

CN104466905A - Fault arc protecting device and method

Info

Publication number: CN104466905A
Application number: CN201410818674.2A
Authority: CN
Inventors: 王新
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2014-12-23
Filing date: 2014-12-23
Publication date: 2015-03-25
Anticipated expiration: 2034-12-23
Also published as: CN104466905B

Abstract

The invention discloses a fault arc protecting device and method. The fault arc protecting device comprises a control unit, a pulse detection circuit and a zero-crossing detection circuit, wherein the pulse detection circuit is used for sampling current signals of a protecting circuit to obtain detection circuit pulse signals and sending the detection circuit pulse signals to the control unit; the zero-crossing detection circuit sends trigger electric signals to the control unit when detecting that the current value of the current signals is zero; the control unit is used for conducting periodic analysis on the detection circuit pulse signals on the basis of the trigger electric signals so that fault arcs can be detected. The fault arc protecting device can shorten judgment time, increase response speed and protect the fault arcs more reliably and effectively.

Description

A kind of fault arc protection device and method thereof

Technical field

The present invention relates to electic protection technical field, particularly a kind of fault arc protection device and method thereof.

Background technology

Fault electric arc circuit protection technology (Arc-fault circuit interrupter, is abbreviated as AFCI) is a new circuit protection technology, and its Main Function is the fire in order to prevent some from being caused by fault electric arc.When the electric arc of these danger may occur in home-use wiring, plug and socket connects and on the wire harness of household electrical appliance inside or the power line of electrical equipment first-class.Initiating failure electric arc main cause is the wearing and tearing of electric wire insulation layer or bad electrical connection.There are some fault electric arc protective circuits in prior art, but there is the shortcoming that Rule of judgment is single, judge length cycle time in these fault electric arc protective circuits.

Summary of the invention

The present invention needs the technical problem solved to be the shortcoming that in prior art, fault electric arc protective circuit exists judgement cycle length.

According to a first aspect of the invention, provide a kind of fault arc protection device, comprising: pulse-detecting circuit, obtain testing circuit pulse signal for carrying out sampling to the current signal of protective circuit, described testing circuit pulse signal is sent to control unit; Zero hands over testing circuit, for when the current value described current signal being detected is zero, sends trigger the signal of telecommunication to described control unit; Control unit, carries out periodicity analysis with detection failure electric arc based on the described triggering signal of telecommunication to described testing circuit pulse signal.

Further, described control unit starts described testing circuit pulse count signal after receiving the described triggering signal of telecommunication, when detecting that in the one-period of current signal the quantity of described testing circuit pulse signal is more than or equal to first threshold, be designated as 1 serial type electric arc.

Further, described control unit judges within the cycle of continuous predetermined number, detect whether the quantity of serial type electric arc is more than or equal to the first set point, if so, then determines serial type fault electric arc to be detected.

Further, if described control unit detects low high two testing circuit pulse signals in the half period of current signal, then determine to occur serial type electric arc in protected circuit.

Further, described first threshold is 4.

Further, described pulse-detecting circuit comprises: current transformer, the first resistance, the second resistance, the first full bridge rectifier and the first electric capacity, wherein, first output pin of the secondary coil of described current transformer is connected to the first end of described first resistance, second end of described first resistance is connected to the first end of described first full bridge rectifier, second output pin of the secondary coil of described current transformer is connected to the 3rd end of described first full bridge rectifier, second end ground connection of described first full bridge rectifier, 4th end of described first full bridge rectifier is connected to the first end of described second resistance, second end ground connection of described second resistance, and the first end of described second resistance is connected to the first input end of described control unit, one end of described first electric capacity is connected to the first end of described second resistance, other end ground connection.

Further, described pulse-detecting circuit also comprises: the 3rd resistance, the 4th resistance and the first voltage stabilizing didoe, wherein, the first end of described second resistance is connected to the first end of described 3rd resistance, second end of described 3rd resistance and the first end of described 4th resistance, the negative electrode of described first voltage stabilizing didoe and the first input end of described control unit connect altogether, the second end of described 4th resistance and the equal ground connection of anode of described first voltage stabilizing didoe.

Further, also comprise: high fdrequency component testing circuit, for detecting the high frequency harmonic components in the current signal of described protected circuit, and sampling acquisition high-frequency detection pulse signal is carried out to described high frequency harmonic components, described high-frequency detection pulse signal is inputed to described control unit; Wherein, described control unit starts described high-frequency detection pulse count signal after receiving the described triggering signal of telecommunication, judge in the one-period of current signal, whether the quantity of high-frequency detection pulse signal is less than Second Threshold, and whether the quantity of testing circuit pulse signal equals the 3rd threshold value, if so, then 1 is designated as and type electric arc.

Further, described control unit judges to detect within the cycle of continuous predetermined number and whether the quantity of type electric arc is more than or equal to the second set point, if so, then determines to detect and type fault electric arc.

Further, described Second Threshold is 2, and described 3rd threshold value is 2.

Further, described high fdrequency component testing circuit comprises: the second electric capacity, second full bridge rectifier, 3rd electric capacity and the 5th resistance, wherein, one end of described second electric capacity connects the first output pin of the secondary coil of described current transformer, the other end is connected to the first end of described second full bridge rectifier, second output pin of the secondary coil of described current transformer is connected to the 3rd end of described second full bridge rectifier, second end ground connection of described second full bridge rectifier, 4th end of described second full bridge rectifier connects and described 3rd electric capacity one end, the first end of described 5th resistance and the 3rd input of described control unit connect altogether, the equal ground connection of second end of the described 3rd electric capacity other end and described 5th resistance.

Further, described current transformer is the current transformer of high permeability core material.

Further, also comprise: electric-leakage detection circuit, for detecting the current signal of protected circuit, the current value of described current signal is converted to magnitude of voltage, and described magnitude of voltage is inputed to described control unit; Wherein, described control unit obtains multiple described magnitude of voltage and calculates average voltage, judges whether described average voltage is greater than electric leakage set point, if so, then determines ground-fault arc to be detected.

Further, also comprise: test circuit, for generating measuring current in described protected circuit, during to determine that electric leakage occurs described protected circuit, whether described protective circuit disconnects described protected circuit.

Further, also comprise: reset circuit, for sending reset signal to described control unit, wherein, described control unit is receiving the laggard horizontal reset operation of described reset signal.

Further, also comprising: protective circuit, when receiving the open circuit control signal that described control unit exports, disconnecting described protected circuit; Wherein, described control unit, when determining fault electric arc to be detected, sends open circuit control signal to described protective circuit; Power circuit, for handing over testing circuit to power for described control unit and described zero.

According to a second aspect of the invention, provide a kind of fault electric arc guard method, comprising: the current signal of protected circuit is sampled, obtain testing circuit pulse signal; When the current value described current signal being detected is zero, generates and trigger the signal of telecommunication; Based on the described triggering signal of telecommunication, periodicity analysis is carried out with detection failure electric arc to described testing circuit pulse signal.

Further, comprise: start described testing circuit pulse count signal after receiving the described triggering signal of telecommunication, when detecting that in the one-period of current signal the quantity of described testing circuit pulse signal is more than or equal to first threshold, be designated as 1 serial type electric arc.

Further, judge within the cycle of continuous predetermined number, detect whether the quantity of serial type electric arc is more than or equal to the first set point, if so, then determine serial type fault electric arc to be detected.

Further, comprising: if low high two testing circuit pulse signals detected in the half period of current signal, then determine to occur serial type electric arc in protected circuit.

Further, described first threshold is 4.

Further, comprising: sampling is carried out to the high frequency harmonic components in the current signal of described protected circuit and obtains high-frequency detection pulse signal; Start after receiving the described triggering signal of telecommunication described high-frequency detection pulse count signal, judge in the one-period of current signal, whether the quantity of high-frequency detection pulse signal is less than Second Threshold, and whether the quantity of testing circuit pulse signal equals the 3rd threshold value, if so, then 1 is designated as and type electric arc.

Further, judge to detect within the cycle of continuous predetermined number whether the quantity of also type electric arc is more than or equal to the second set point, if so, then determine to detect and type fault electric arc.

Further, comprising: the current signal detecting protected circuit, the current value of described current signal is converted to magnitude of voltage; Obtain multiple described magnitude of voltage and calculate average voltage, judging whether described average voltage is greater than electric leakage set point, if so, then determining ground-fault arc to be detected.

In the present invention, pulse-detecting circuit is carried out sampling to the current signal of protective circuit and is obtained testing circuit pulse signal, and described testing circuit pulse signal is sent to control unit; Zero hands over testing circuit when the current value described current signal being detected is zero, sends trigger the signal of telecommunication to described control unit; Control unit carries out periodicity analysis with detection failure electric arc based on the described triggering signal of telecommunication to described testing circuit pulse signal.Fault arc protection device of the present invention can shorten determination time, improves response speed, more effectively reliable to fault electric arc protection.

By referring to the detailed description of accompanying drawing to exemplary embodiment of the present invention, further feature of the present invention and advantage thereof will become clear.

Accompanying drawing explanation

What form a part for specification drawings describes embodiments of the invention, and together with the description for explaining principle of the present invention.

With reference to accompanying drawing, according to detailed description below, clearly the present invention can be understood, wherein:

Fig. 1 is the structural representation of the fault arc protection device illustrated according to the embodiment of the present invention.

Fig. 2 A illustrates the pulse signal figure detected when occurring without serial type electric arc in protected circuit according to the fault arc protection device of the embodiment of the present invention.

Fig. 2 B illustrates the pulse signal figure detected when there being serial type electric arc to occur in protected circuit according to the fault arc protection device of the embodiment of the present invention.

Fig. 3 A illustrates the pulse signal figure good electric arc occurred in protected circuit being detected according to the fault arc protection device of the embodiment of the present invention.

Fig. 3 B illustrates the pulse signal figure good electric arc occurred in protected circuit being detected according to the fault arc protection device of the embodiment of the present invention.

Fig. 4 illustrates the circuit diagram according to the power circuit in the fault arc protection device of the embodiment of the present invention.

Fig. 5 illustrates the circuit diagram according to the control unit in the fault arc protection device of the embodiment of the present invention.

Fig. 6 illustrates the circuit diagram according to the protective circuit in the fault arc protection device of the embodiment of the present invention.

Fig. 7 is the circuit diagram illustrated according to the pulse-detecting circuit in the fault arc protection device of the embodiment of the present invention and high fdrequency component testing circuit.

Fig. 8 illustrates the circuit diagram handing over testing circuit according to zero in the fault arc protection device of the embodiment of the present invention.

Fig. 9 is the structural representation of the fault arc protection device illustrated according to other embodiments of the present invention.

Figure 10 is the structural representation of the fault arc protection device illustrated according to other embodiments of the present invention.

Figure 11 illustrates the circuit diagram according to the electric-leakage detection circuit in the fault arc protection device of other embodiments of the present invention.

Figure 12 is the structural representation of the fault arc protection device illustrated according to other embodiments of the present invention.

Figure 13 illustrates the circuit diagram according to the test circuit in the fault arc protection device of other embodiments of the present invention.

Figure 14 is the structural representation of the fault arc protection device illustrated according to other embodiments of the present invention.

Figure 15 illustrates the circuit diagram according to the reset circuit in the fault arc protection device of other embodiments of the present invention.

Figure 16 is the flow chart of the fault electric arc guard method illustrated according to the embodiment of the present invention.

Figure 17 is the flow chart of the fault electric arc guard method illustrated according to other embodiments of the present invention.

Figure 18 is the flow chart of the fault electric arc guard method illustrated according to other embodiments of the present invention.

Figure 19 is the flow chart of the fault electric arc guard method illustrated according to other embodiments of the present invention.

Embodiment

Various exemplary embodiment of the present invention is described in detail now with reference to accompanying drawing.It should be noted that: unless specifically stated otherwise, otherwise positioned opposite, the numerical expression of the parts of setting forth in these embodiments and step and numerical value do not limit the scope of the invention.

Meanwhile, it should be understood that for convenience of description, the size of the various piece shown in accompanying drawing is not draw according to the proportionate relationship of reality.

Illustrative to the description only actually of at least one exemplary embodiment below, never as any restriction to the present invention and application or use.

May not discuss in detail for the known technology of person of ordinary skill in the relevant, method and apparatus, but in the appropriate case, described technology, method and apparatus should be regarded as a part of authorizing specification.

In all examples with discussing shown here, any occurrence should be construed as merely exemplary, instead of as restriction.Therefore, other example of exemplary embodiment can have different values.

It should be noted that: represent similar terms in similar label and letter accompanying drawing below, therefore, once be defined in an a certain Xiang Yi accompanying drawing, then do not need to be further discussed it in accompanying drawing subsequently.

Fig. 1 is the structural representation of the fault arc protection device illustrated according to the embodiment of the present invention.As shown in Figure 1, fault arc protection device 10 comprises: control unit 200, pulse-detecting circuit 400 and zero hand over testing circuit 500, for illustrative purposes, also show power circuit 100, protective circuit 300 in Fig. 1.Wherein,

The output of described pulse-detecting circuit 400 is electrically connected with the first input end of described control unit 200, described pulse-detecting circuit 400 obtains testing circuit pulse signal for carrying out sampling to the current signal of protective circuit, and described testing circuit pulse signal is sent to control unit 200;

Described zero hands over the output of testing circuit 500 to be electrically connected with the second input of described control unit 200, and described zero hands over testing circuit 500 for when the current value described current signal being detected is zero, sends trigger the signal of telecommunication to described control unit 200;

Described control unit 200 carries out periodicity analysis with detection failure electric arc based on the described triggering signal of telecommunication to described testing circuit pulse signal.

In this embodiment, pulse-detecting circuit is carried out sampling to the current signal of protective circuit and is obtained testing circuit pulse signal, and described testing circuit pulse signal is sent to control unit; Zero hands over testing circuit when the current value described current signal being detected is zero, sends trigger the signal of telecommunication to described control unit; Control unit carries out periodicity analysis with detection failure electric arc based on the described triggering signal of telecommunication to described testing circuit pulse signal.The fault arc protection device of this embodiment can shorten determination time, improves response speed, more effectively reliable to fault electric arc protection.

In an embodiment of the present invention, described control unit 200 starts described testing circuit pulse count signal after receiving the described triggering signal of telecommunication, when detecting that in the one-period of current signal the quantity of described testing circuit pulse signal is more than or equal to first threshold (such as 4), be designated as 1 serial type electric arc.In another embodiment, described control unit (200) judges within the cycle of continuous predetermined number (such as 3), detect whether the quantity of serial type electric arc is more than or equal to the first set point (such as 3), if so, then determine serial type fault electric arc to be detected.Because control unit hands over the triggering of testing circuit to judge the timing position of testing circuit pulse signal according to zero, can determination time be shortened, improve response speed, more effectively reliable to fault electric arc protection.

In an embodiment of the present invention, if described control unit 200 detects low high two testing circuit pulse signals in the half period of current signal, then determine to occur serial type electric arc in protected circuit.

In an embodiment of the present invention, described fault arc protection device also comprises: protective circuit 300, is electrically connected with described control unit 200, when receiving the open circuit control signal that described control unit 200 exports, disconnects described protected circuit; Wherein, described control unit 200, when determining fault electric arc (such as serial type fault electric arc) to be detected, sends open circuit control signal to described protective circuit 300.

In an embodiment of the present invention; described fault arc protection device also comprises: power circuit 100; be electrically connected with described control unit 200, and hand over testing circuit 500 to be electrically connected with described zero, for handing over testing circuit 500 to power for described control unit 200 and described zero.

When there is serial type electric arc in protected circuit; the sine wave of electric current there will be of short duration equal value; if there is of short duration equal value phenomenon to occur; pulse-detecting circuit can sample in half period respectively have certain amplitude, one low one high and between spaced two impulse waveforms (as shown in Figure 2 B); during without serial type electric arc, the impulse waveform (as shown in Figure 2 A) that has certain amplitude in half period, can only be sampled.But detect that pulse signal as shown in Figure 2 B is not necessarily caused by fault electric arc, the electric arc being also likely or other noise source cause.Fig. 3 A and Fig. 3 B shows in protected circuit the pulse signal figure detected when there is electric arc.As can be seen from Fig. 3 A and Fig. 3 B, although detect respectively have certain amplitude, one low one high and between spaced two impulse waveforms, this electric arc is not fault electric arc.Such as, the relay normally started and A.C. contactor can produce serial type electric arc when action.

Therefore, serial type fault electric arc whether is there is in the protected circuit of detection, described control unit is needed to judge further, such as, described control unit 200 obtains described testing circuit pulse signal, and when receiving the described triggering signal of telecommunication to described testing circuit pulse count signal, when detecting that in the one-period of current signal the quantity of testing circuit pulse signal is more than or equal to first threshold (such as 4), be designated as 1 serial type electric arc, judge within the cycle of continuous predetermined number, detect whether the quantity of serial type electric arc is more than or equal to the first set point, if, then determine serial type fault electric arc to be detected, export open circuit and control signal to described protective circuit 300, protected circuit is disconnected to make described protective circuit.Continuous 3 cycles such as can be selected as the cycle of continuous predetermined number, and the first set point can be 3.This is because the such as normal relay that starts and A.C. contactor can produce serial type electric arc when action, needs 2 cycles to avoid normal arc Current Waveform Characteristics.Certainly, those skilled in the art will appreciate that according to different needs, quantity and first set point in the cycle of predetermined number recited above all can set according to actual needs, are not limited in example recited above.

The circuit connection diagram of testing circuit 500 is handed over to be illustrated to power circuit 100, control unit 200, protective circuit 300, pulse-detecting circuit 400 and zero respectively below.Certainly, be only exemplary to illustrating of each circuit below it should be appreciated by those skilled in the art that, those skilled in the art can adopt other circuit, and therefore scope of the present invention is not limited in example below.

Fig. 4 illustrates the circuit diagram according to the power circuit in the fault arc protection device of the embodiment of the present invention.As shown in Figure 4, the circuit connecting relation of power circuit 100 comprises: 2 and 1 of the terminal X001 of described power circuit 100 is connected L line (live wire) and the N line (zero line) of alternating current 220V respectively, L line and N line are also connected with piezo-resistance Z1 (such as piezo-resistance specification is 471K, and namely surge operation voltage is 470V), ceramic disc capacitor C0 (such as electric capacity specification is 472K/1kV) and resistance R0 through 2 of terminal X001 and 1; And L line is connected input 1 pin of rectifier bridge BG1 with R4 (such as 47k Ω) through the resistance R1 (such as 47k Ω) of two parallel relationship, N line connects input 2 pin of rectifier bridge BG1.The first end of output 3 pin of rectifier bridge BG1 and the positive pole of electrochemical capacitor C1 (such as capacitance 47 μ F, maximum carrying voltage 25V), capacitor discharge resistance R5 (such as resistance value 1M Ω (megohm)), the negative electrode of voltage stabilizing didoe D1 (such as voltage stabilizing value 12V), the first end of current-limiting resistance R6 (such as 10k Ω), the first end of current-limiting resistance R7 (such as 3.3k Ω), the first end of current-limiting resistance R27 (such as 5.1k Ω) are connected; The anode ground connection respectively of second end of output 4 pin of rectifier bridge BG1, the negative pole of electrochemical capacitor C1, capacitor discharge resistance R5, voltage stabilizing didoe D1, voltage stabilizing didoe D2, voltage stabilizing didoe D3.Output 3 pin of rectifier bridge BG1 can provide+12V power supply.In addition ,+12V power supply is connected with the negative electrode of voltage stabilizing didoe D3 through current-limiting resistance R7, such as, can provide positive supply VCC for control unit (not shown in Fig. 4).Second end of current-limiting resistance R6 can the anode of connecting luminous diode D7, and for light-emitting diode D7 provides power supply, the minus earth of light-emitting diode D7, light-emitting diode D7 can as power supply indicator.Utilize the power circuit shown in Fig. 4 can be some other unit or circuit supply.Certainly, it should be appreciated by those skilled in the art that the power circuit shown in Fig. 4 is only exemplary, the present invention can also adopt other power circuit, and therefore scope of the present invention is not limited in this.

Fig. 5 illustrates the circuit diagram according to the control unit in the fault arc protection device of the embodiment of the present invention.As shown in Figure 5,1 pin of control unit 200 connects VCC (the such as VCC of power circuit 100 shown in connection layout 4, powered by power circuit), 14 pin ground connection, some other pin can as input or output, such as, 5 pin P1.3 as the first input end of control unit, can be connected with the output of pulse-detecting circuit; 6 pin P1.4 can, as the second input of control unit, hand over the output of testing circuit to be connected with zero; 2 pin P1.0 as the output of control unit, can be connected with the input of protective circuit.In addition, also have some other pins, illustrate in the associated description below.This control unit can be such as the microprocessor of MSP430F2012 for model.Certainly, it will be understood by those skilled in the art that the present invention can also adopt the control unit of other model or type, scope of the present invention is not limited in this.

Fig. 6 illustrates the circuit diagram according to the protective circuit in the fault arc protection device of the embodiment of the present invention.As shown in Figure 6, the circuit connecting relation of protective circuit 300 comprises: the first end of resistance R19 (such as resistance value 1k Ω) is connected with 2 pin (P1.0) of the control unit 200 shown in Fig. 5, the control pole (g pole) of its second end and thyristor 302 (such as controllable silicon BT168GW) and one end of flaky electric capacity C13 (such as capacitance 223pF) connect altogether, the negative electrode (k pole) of thyristor 302 is all connected with zero line with the other end of flaky electric capacity C13, the anode (a pole) of thyristor 302 is connected with one end of the breaking coil of release 301, the other end of the breaking coil of release 301 is connected with L line (i.e. live wire), figure 4 illustrates contact jaw TK_L and TK_N (both dashed middle line representatives are linkage), when contact jaw TK_L and TK_N is pressed, respectively during contact terminal M and N, namely the other end realizing the breaking coil of release 301 is connected with L line, and the negative electrode of thyristor 302 (k pole) is all connected with zero line with the other end of flaky electric capacity C13.In another embodiment, the other end of the breaking coil of release 301 can be connected with the negative electrode of diode (not shown in Fig. 6), and the anode of this diode is connected with the L line shown in Fig. 4.

The operation principle of protective circuit is: control unit exports open circuit control signal (such as trigger pip); described open circuit control signal transfers to thyristor 302 through resistance R19; thyristor 302 triggering and conducting; the circuit loop of the breaking coil of release 301 is connected; and having direct current to flow through breaking coil, the action of release actuating mechanism, makes release complete tripping operation of threading off; cut off the load-carrying power supply of release, namely realize the protection to protected circuit.

Fig. 7 is the circuit diagram illustrated according to the pulse-detecting circuit in the fault arc protection device of the embodiment of the present invention and high fdrequency component testing circuit.Fig. 7 shows pulse-detecting circuit 400 and high fdrequency component testing circuit 600, and the description about high fdrequency component testing circuit 600 will be explained below, and the circuit connecting relation of pulse-detecting circuit 400 is first described here.

In an embodiment of the present invention, described pulse-detecting circuit 400 comprises: current transformer 401, first resistance R22 (such as resistance value 1k Ω), the second resistance R17 (such as resistance value 470 Ω), the first full bridge rectifier 402 (full bridge rectifier be such as made up of four diodes D40, D41, D42, D43 as shown in Figure 7) and the first electric capacity C10 (such as capacitance 104pF), wherein, first output pin Y1 of the secondary coil of described current transformer 401 is connected to the first end of described first resistance R22, second end of described first resistance R22 is connected to the first end of described first full bridge rectifier 402, second output pin Y2 of the secondary coil of described current transformer 401 is connected to the 3rd end of described first full bridge rectifier 402, second end ground connection of described first full bridge rectifier 402, 4th end of described first full bridge rectifier 402 is connected to the first end of described second resistance R17, the second end ground connection of described second resistance R17, and the first end of described second resistance R17 can be connected to the first input end P1.3 of described control unit 200, one end of described first electric capacity C10 is connected to the first end of described second resistance R17, other end ground connection.

In this embodiment; such as can by the centre bore of the live wire in protected circuit through current transformer 401; due to the change of electric current in live wire; described current transformer produces induced current in secondary coil; therefore described pulse-detecting circuit can detect the current signal of protected circuit, and sampling obtains testing circuit pulse signal and inputs to described control unit.In this embodiment, owing to adopting full bridge rectifier, therefore can increase signal processing time number of times, be conducive to shortening detection time.Certainly, it will be understood by those skilled in the art that and can also adopt other rectification circuit, such as half-wave rectifying circuit, therefore scope of the present invention is not limited in this.

In an embodiment of the present invention, current transformer can adopt the current transformer of high permeability core material.Such as, the inductance of core material can be adopted to be greater than the current transformer of 200mH (milihenry).

In another embodiment, as shown in Figure 7, described pulse-detecting circuit 400 also comprises: the 3rd resistance R18 (such as resistance value 1k Ω), 4th resistance R21 (such as resistance value 10k Ω) and the first voltage stabilizing didoe D8 (such as voltage stabilizing value 2.7V), wherein, the first end of described second resistance R17 is connected to the first end of described 3rd resistance R18, second end of described 3rd resistance R18 and the first end of described 4th resistance R21, the negative electrode of described first voltage stabilizing didoe D8 and the first input end P1.3 of described control unit 200 (not shown in Fig. 7) connect altogether, second end of described 4th resistance R21 and the equal ground connection of anode of described first voltage stabilizing didoe D8.

3rd resistance R18 and the 4th resistance R21 forms the build-out resistor of pulse-detecting circuit 400, and the 3rd resistance R18 plays the effect of current limliting and dividing potential drop, and the 4th resistance R21 plays dividing potential drop and drop-down effect.By arranging described first voltage-stabiliser tube D8, sampled voltage can be avoided to exceed the tolerance range of control unit 200 and cause control unit to damage.

Fig. 8 illustrates the circuit diagram handing over testing circuit according to zero in the fault arc protection device of the embodiment of the present invention.As shown in Figure 8, zero hands over the circuit connecting relation of testing circuit 500 to comprise: described zero hands over testing circuit 500 to obtain AC signal from power circuit 100, and through the resistance R50 (such as resistance value 1M Ω) of series relationship, R51 (such as resistance value 5.1k Ω), R52 (such as resistance value 5.1k Ω) is connected to 3 pin of the inverting input of integrated operational amplifier U4 (such as LM392-N model), 3 pin are connected to the+5V power supply of power circuit 100 by resistance R54 (such as resistance value 100k Ω), resistance R51 is connected to the negative electrode of diode D51 (such as IN4148 model) with the end that is connected of resistance R52, the plus earth of diode D51, 1 pin of the in-phase input end of integrated operational amplifier U4 respectively with resistance R53 (such as resistance value 100k Ω), R56 (such as resistance value 20k Ω), one end of R57 (such as resistance value 10k Ω) connects, the other end of resistance R53 connects the+5V power supply of power circuit 100, resistance R57 other end ground connection, the other end of resistance R56 respectively with 4 pin of the output of integrated operational amplifier U4, resistance R55 (such as resistance value 5.1k Ω) is connected with one end of R59 (such as resistance value 1k Ω), the other end of resistance R59 is connected with 6 pin (i.e. P1.4) of the second input of control unit 200 with the negative electrode of voltage stabilizing didoe D9 (such as voltage stabilizing value 2.7V) respectively, the other end of resistance R55 connects the power supply+5V of power circuit 100, the anode of voltage stabilizing didoe D9 and the equal ground connection of 2 pin of integrated operational amplifier U4.

In this embodiment; described zero hands over testing circuit can detect the cycle of the current signal of protected circuit; and when current value current signal being detected is zero; send to described control unit and trigger the signal of telecommunication, to make to count the testing circuit pulse signal received from described pulse-detecting circuit when receiving the described triggering signal of telecommunication.Described zero hands over testing circuit can be used for triggered interrupts, carry out A/D conversion, can determine can sample in half period respectively have certain amplitude, one low one high and between the timing position of spaced two impulse waveforms, promote efficiency and the antijamming capability of detection failure electric arc.

Fig. 9 is the structural representation of the fault arc protection device illustrated according to other embodiments of the present invention.As shown in Figure 9, described fault arc protection device 20 comprises: power circuit 100, control unit 200, protective circuit 300, pulse-detecting circuit 400, zero hand over testing circuit 500 and high fdrequency component testing circuit 600.Wherein, power circuit 100, control unit 200, protective circuit 300, pulse-detecting circuit 400 and zero hand over testing circuit 500 to hand over testing circuit 500 similar with the power circuit 100 shown in Fig. 1, control unit 200, protective circuit 300, pulse-detecting circuit 400 and zero respectively, repeat no more here.

The output of described high fdrequency component testing circuit 600 is electrically connected with the 3rd input (4 pin P1.2 of such as control unit shown in Fig. 5) of described control unit 200, described high fdrequency component testing circuit 600 is for detecting the high frequency harmonic components in the current signal of described protected circuit, and sampling acquisition high-frequency detection pulse signal is carried out to described high frequency harmonic components, described high-frequency detection pulse signal is inputed to described control unit 200; Wherein, described control unit 200 starts described high-frequency detection pulse count signal after receiving the described triggering signal of telecommunication, judge in the one-period of current signal, whether the quantity of high-frequency detection pulse signal is less than Second Threshold (such as 2), and whether the quantity of testing circuit pulse signal equals the 3rd threshold value (such as 2), if so, then 1 is designated as and type electric arc.In another embodiment, described control unit 200 judges to detect within the cycle of continuous predetermined number (such as 3) and whether the quantity of type electric arc is more than or equal to the second set point (such as 3), if so, then also type fault electric arc is determined to detect.

In this embodiment, pulse signal is detected to control unit carry high frequency by high fdrequency component testing circuit, control unit compares to the high-frequency detection pulse signal received from high fdrequency component testing circuit and from the testing circuit pulse signal that pulse-detecting circuit receives, judge in the one-period of current signal, whether the quantity of high-frequency detection pulse signal is less than Second Threshold (such as 2), and whether the quantity of testing circuit pulse signal equals the 3rd threshold value (such as 2), if, then be designated as 1 and type electric arc, when detecting in the cycle continuous predetermined number (such as 3) and the quantity of type electric arc is more than or equal to the second set point (such as 3), determine to detect and type fault electric arc.Further, described control unit when determine to detect and type fault electric arc time, export open circuit control signal to protective circuit 300.

This embodiment can be used for detecting and type fault electric arc, its operation principle is: when in protected circuit occur and type electric arc time, pulse-detecting circuit sensed current signal, and 1 pulse signal (i.e. testing circuit pulse signal is obtained in half period, here be different to have detected when serial type electric arc occurs certain amplitude, one low one high and between spaced two impulse waveforms), such pulse-detecting circuit can detect 2 pulse signals in one-period; And for high fdrequency component testing circuit, because there is inhibitory action in big current magnetic field to high-frequency pulse signal, therefore the quantity of pulse signal (i.e. high-frequency detection pulse signal) that high fdrequency component testing circuit detects can reduce, such as, in one-period, 1 pulse signal or 0 pulse signal detected; Control unit judges in the one-period of current signal, whether the quantity of high-frequency detection pulse signal is less than 2, and whether the quantity of testing circuit pulse signal equals 2, if, then be designated as 1 and type electric arc, owing to occurring that also type electric arc is exactly not necessarily fault electric arc, so need to judge to detect within the cycle of continuous predetermined number (such as 3) whether the quantity of also type electric arc is more than or equal to the second set point (such as 3), if so, then also type fault electric arc is determined to detect.Further, described control unit exports open circuit and controls signal to described protective circuit to disconnect protected circuit.

Circuit connecting relation about high fdrequency component testing circuit can the high fdrequency component testing circuit 600 shown in reference diagram 7.As shown in Figure 7, described high fdrequency component testing circuit 600 comprises: the second electric capacity C11 (such as capacitance 104pF), second full bridge rectifier 603 is (such as shown in Figure 7 by four diode D60, D61, D62, the full bridge rectifier of D63 composition), 3rd electric capacity C12 (such as capacitance 104pF) and the 5th resistance R20 (such as resistance value 33k Ω), wherein, one end of described second electric capacity C11 connects the first output pin Y1 of the secondary coil of current transformer 401 (such as the current transformer of high permeability core material), the other end is connected to the first end of described second full bridge rectifier 603, second output pin Y2 of the secondary coil of described current transformer 401 is connected to the 3rd end of described second full bridge rectifier 603, second end ground connection of described second full bridge rectifier 603, 4th end of described second full bridge rectifier 603 connects and described 3rd electric capacity C12 one end, the first end of described 5th resistance R20 and the 3rd input (4 pin P1.2 of such as control unit shown in Fig. 5) of described control unit 200 connect altogether, the equal ground connection of second end of the described 3rd electric capacity C12 other end and described 5th resistance R20.

In this embodiment, owing to adopting full bridge rectifier, therefore can increase signal processing time number of times, be conducive to shortening detection time.Certainly, it will be understood by those skilled in the art that and can also adopt other rectification circuit, such as half-wave rectifying circuit, therefore scope of the present invention is not limited in this.

Figure 10 is the structural representation of the fault arc protection device illustrated according to other embodiments of the present invention.As shown in Figure 10, described fault arc protection device 30 comprises: power circuit 100, control unit 200, protective circuit 300, pulse-detecting circuit 400, zero hand over testing circuit 500, high fdrequency component testing circuit 600 and electric-leakage detection circuit 700.Wherein, power circuit 100, control unit 200, protective circuit 300, pulse-detecting circuit 400, zero hand over testing circuit 500 and high fdrequency component testing circuit 600 hand over the power circuit 100 shown in Fig. 9, control unit 200, protective circuit 300, pulse-detecting circuit 400, zero respectively testing circuit 500 and high fdrequency component testing circuit 600 similar, repeat no more here.

The output of described electric-leakage detection circuit 700 is electrically connected with the four-input terminal (3 pin P1.1 of such as control unit 200 shown in Fig. 5) of described control unit 200, described electric-leakage detection circuit 700 is for detecting the current signal of protected circuit, the current value of described current signal is converted to magnitude of voltage, and described magnitude of voltage is inputed to described control unit 200, wherein, described control unit 200 obtains multiple described magnitude of voltage and calculates average voltage (i.e. the mean value of multiple described magnitude of voltage), judge whether described average voltage is greater than electric leakage set point (such as 1.1V), if, then determine ground-fault arc to be detected.This embodiment can be used for carrying out detection of electrical leakage (i.e. detection of ground faults electric arc).Further, described control unit, when determining ground-fault arc to be detected, exports open circuit and controls signal to described protective circuit 300.In another embodiment, power circuit 100 is electrically connected with described electric-leakage detection circuit 700, for described electric-leakage detection circuit 700 is powered.

In an embodiment of the present invention, the current limit a that can set the ground arc of described electric-leakage detection circuit (can be such as 5mA, 10mA, 30mA, 75mA etc.), when there is ground arc in protected circuit, when the current value of generation ground arc is more than or equal to current limit a, the output of described electric-leakage detection circuit will be supplied to the magnitude of voltage b (such as 1.1V) of the direct current signal of control unit 200 sampling processing, described control unit 200 obtains multiple magnitude of voltage, and calculate average voltage, judge whether described average voltage is greater than electric leakage set point, if, then determine ground-fault arc to be detected, export open circuit and control signal to described protective circuit 300, to disconnect protected circuit.

In an embodiment of the present invention; rapider in order to make fault arc protection device respond; also can two control units be set in the fault arc protection device of the embodiment of the present invention; one of them is for detection of ground faults electric arc, and another is for detecting serial type fault electric arc and and type fault electric arc.Because two control units are respectively used to detect different fault electric arcs, the speed of service is improved, and therefore can improve the response speed of fault arc protection device.

A kind of circuit connecting relation of electric-leakage detection circuit 700 is described below in conjunction with Figure 11.

Figure 11 illustrates the circuit diagram according to the electric-leakage detection circuit in the fault arc protection device of other embodiments of the present invention.As shown in figure 11, the circuit connecting relation of electric-leakage detection circuit 700 comprises: the X002 terminal 5 of electric-leakage detection circuit 700, 6 two output pins connecting zero sequence current mutual inductor (not shown in Figure 11) respectively, the pin of the zero sequence current mutual inductor be connected with X002 terminal 6 also with one end of electric capacity C30 (such as capacitance 104pF), one end of resistance R30 (10k Ω), the negative electrode of diode D30 (such as IN4148 model), the anode of diode D31 (such as IN4148 model), 1 pin of integrated operational amplifier U3, one end of resistance R33 (such as resistance value 10k Ω), one end of resistance R35 (such as resistance value 20M Ω), one end of resistance R36 (such as resistance value 10k Ω) connects altogether, the pin of the zero sequence current mutual inductor be connected with X002 terminal 5 also connects altogether with the other end of electric capacity C30, the other end of resistance R30, the anode of diode D30, the negative electrode of diode D31,3 pin of integrated operational amplifier U3.Power circuit 100 provides 5 pin of+12V to integrated operational amplifier U3, the 2 pin ground connection (such as connecting direct current seedbed) of integrated operational amplifier U3, 4 pin of integrated operational amplifier U3 are connected with+the 5V of power circuit through resistance R34 (such as resistance value 3k Ω), and 4 pin of U3 also with the other end of R35, one end of flaky electric capacity C7 (such as capacitance 104pF), and electrochemical capacitor C8 (such as capacitance 47 μ F, maximum carrying voltage 25V) positive pole connect altogether, the other end of resistance R33 is connected with+5V, one end of the negative pole of electrochemical capacitor C8 and resistance R14 (such as resistance value 33k Ω) and the anode of diode D5 (such as IN4148 model) connect altogether, one end of the negative electrode of diode D5 and flaky electric capacity C9 (such as capacitance 105pF), one end of resistance R15 (resistance value 1.5M Ω), shown in the negative electrode of voltage stabilizing didoe D10 (such as voltage stabilizing value 2.7V) and Fig. 5,3 pin (i.e. P1.1) of control unit 200 connect altogether, the anode of the other end of the other end of resistance R36, the other end of flaky electric capacity C7, resistance R14, the other end of flaky electric capacity C9, the other end of resistance R15 and voltage stabilizing didoe D10 connects and ground connection altogether.

After the signal transacting of electric-leakage detection circuit 700; output can supply 3 pin of d. c. voltage signal to described control unit of control unit 200 sampling processing; described control unit is through foregoing calculating voltage mean value; and judge whether described average voltage is greater than electric leakage set point; if; then determine to occur electric leakage (namely there is ground-fault arc) in protected circuit, and export open circuit and control signal to described protective circuit 300, to disconnect protected circuit.

Figure 12 is the structural representation of the fault arc protection device illustrated according to other embodiments of the present invention.As shown in Figure 10, described fault arc protection device 40 comprises: power circuit 100, control unit 200, protective circuit 300, pulse-detecting circuit 400, zero hand over testing circuit 500, high fdrequency component testing circuit 600, electric-leakage detection circuit 700 and test circuit 800.Wherein, power circuit 100, control unit 200, protective circuit 300, pulse-detecting circuit 400, zero hand over testing circuit 500, high fdrequency component testing circuit 600 and electric-leakage detection circuit 700 to hand over testing circuit 500, high fdrequency component testing circuit 600 and electric-leakage detection circuit 700 similar with the power circuit 100 shown in Figure 10, control unit 200, protective circuit 300, pulse-detecting circuit 400, zero respectively, repeat no more here.

Test circuit 800 for generating measuring current in described protected circuit, and during to determine that electric leakage occurs described protected circuit, whether described protective circuit 300 disconnects described protected circuit.

A kind of circuit connecting relation of test circuit 800 is described below in conjunction with Figure 13.

Figure 13 illustrates the circuit diagram according to the test circuit in the fault arc protection device of other embodiments of the present invention.As shown in figure 13, the circuit connecting relation of described test circuit 800 comprises: one end of the key switch S1 of test circuit 800 connects N line (i.e. zero line), one end of other end contact resistance R9 (such as resistance value 11k Ω), the other end of resistance R9 to be worn after the zero sequence current mutual inductor (not shown in Figure 13) of electric-leakage detection circuit 700 (such as wear primary winding after three weeks) around described zero sequence current mutual inductor through electric wire and is connected to L line (i.e. live wire), and N line and L line are connected on 1,2 of the terminal X001 of power circuit 100 respectively here.Certainly, electric wire, when wearing the primary winding around zero sequence current mutual inductor, also can be worn all numbers around other quantity, can determine according to actual conditions.

In this embodiment; push button switch S 1; the same circle coil such as having flow through current value at the primary winding of zero sequence current mutual inductor is that I (is such as greater than the electric current of 15mA; such as 20mA, 30mA) electric current; verify earth leakage protective action; if protective circuit disconnects protected circuit, then determine that electric-leakage detection circuit can detect electric leakage (i.e. ground arc).

Figure 14 is the structural representation of the fault arc protection device illustrated according to other embodiments of the present invention.As shown in figure 14, described fault arc protection device 50 comprises: power circuit 100, control unit 200, protective circuit 300, pulse-detecting circuit 400, zero hand over testing circuit 500, high fdrequency component testing circuit 600, electric-leakage detection circuit 700, test circuit 800 and reset circuit 900.Wherein, power circuit 100, control unit 200, protective circuit 300, pulse-detecting circuit 400, zero hand over testing circuit 500, high fdrequency component testing circuit 600, electric-leakage detection circuit 700 and test circuit 800 to hand over testing circuit 500, high fdrequency component testing circuit 600, electric-leakage detection circuit 700 and test circuit 800 similar with the power circuit 100 shown in Figure 12, control unit 200, protective circuit 300, pulse-detecting circuit 400, zero respectively, repeat no more here.

The output of reset circuit 900 is electrically connected with the reset terminal of described control unit 200, and for sending reset signal to described control unit 200, wherein, described control unit 200 is receiving the laggard horizontal reset operation of described reset signal.

A kind of circuit connecting relation of reset circuit 900 is described below in conjunction with Figure 15.

Figure 15 illustrates the circuit diagram according to the reset circuit in the fault arc protection device of other embodiments of the present invention.As shown in figure 15, the circuit connecting relation of reset circuit 900 comprises: 3 pin of reset unit U2 (such as TLV803 model) connect the DC power supply VCC of power circuit 100,2 pin of reset unit U2 are connected to 10 pin (i.e. reset terminal/RST) of described control unit 200, and 3 pin of reset unit U2 are connected by resistance R8 (such as resistance value 100k Ω) with between 2 pin.The 1 pin ground connection (such as connecting direct current ground) of reset unit U2.

In this embodiment, reset power U2 exports 10 pin (namely/RST) of reset signal to described control unit by 2 pin, and control unit receives the laggard horizontal reset operation of described reset signal.

In an embodiment of the present invention, described fault arc protection device can also comprise: faulty indication element, is electrically connected with described control unit, is used to indicate in protected circuit the electric arc that whether breaks down.Particularly, this faulty indication element can be connected with 7 pin (i.e. P1.5) of control unit, 8 pin (i.e. P1.6), 9 pin (i.e. P1.7) respectively, and what can detect that 7 pin of control unit, 8 pin, 9 pin export respectively is high level or low level.Such as, when control unit detects ground-fault arc (namely electric leakage being detected), P1.5 output exports high level to event indicator elment, and when no ground fault electric arc, P1.5 output output low level is to faulty indication element; When control unit detect and type fault electric arc time, P1.6 output export high level to faulty indication element, without and type fault electric arc time output low level to faulty indication element; When control unit detects serial type fault electric arc, P1.7 output exports high level to faulty indication element, without output low level during serial type fault electric arc to faulty indication element.Again such as, faulty indication element can comprise three indicator lights, and (such as during high level, indicator light is luminous, during low level, indicator light is not luminous), these three indicator lights can distinguish 7 pin (i.e. P1.5), 8 pin (i.e. P1.6), 9 pin (i.e. P1.7) of connection control unit, to indicate whether respectively corresponding fault electric arc to be detected.

In step S1601, the current signal of protected circuit is sampled, obtain testing circuit pulse signal.

In step S1602, when current value current signal being detected is zero, generates and trigger the signal of telecommunication.

In step S1603, based on the triggering signal of telecommunication, periodicity analysis is carried out with detection failure electric arc to testing circuit pulse signal.

In this embodiment, the current signal of protected circuit is sampled, obtain testing circuit pulse signal; When current value current signal being detected is zero, generates and trigger the signal of telecommunication; Based on the triggering signal of telecommunication, periodicity analysis is carried out with detection failure electric arc to testing circuit pulse signal, thus can determination time be shortened, improve response speed, more effectively reliable to fault electric arc protection.

In another embodiment, when determining fault electric arc to be detected, send open circuit control signal to protective circuit, described protective circuit, when receiving open circuit control signal, disconnects protected circuit.

In an embodiment of the present invention; described fault electric arc guard method comprises: start described testing circuit pulse count signal after receiving the described triggering signal of telecommunication; when detecting that in the one-period of current signal the quantity of described testing circuit pulse signal is more than or equal to first threshold (such as 4), be designated as 1 serial type electric arc.In another embodiment, judge within the cycle of continuous predetermined number (such as 3), detect whether the quantity of serial type electric arc is more than or equal to the first set point (such as 3), if so, then determine serial type fault electric arc to be detected.Owing to can judge the timing position of testing circuit pulse signal according to the triggering triggering the signal of telecommunication, can determination time be shortened, improve response speed, more effectively reliable to fault electric arc protection.

In an embodiment of the present invention, described fault electric arc guard method comprises: if low high two testing circuit pulse signals detected in the half period of current signal, then determine to occur serial type electric arc in protected circuit.

In an embodiment of the present invention, described fault electric arc guard method comprises: carry out sampling to the high frequency harmonic components in the current signal of protected circuit and obtain high-frequency detection pulse signal; Start after receiving the described triggering signal of telecommunication described high-frequency detection pulse count signal, judge in the one-period of current signal, whether the quantity of high-frequency detection pulse signal is less than Second Threshold (such as 2), and whether the quantity of testing circuit pulse signal equals the 3rd threshold value (such as 2), if so, then 1 is designated as and type electric arc.In another embodiment, judge to detect within the cycle of continuous predetermined number (such as 3) whether the quantity of also type electric arc is more than or equal to the second set point (such as 3), if so, then determine to detect and type fault electric arc.

In an embodiment of the present invention, described fault electric arc guard method comprises: the current signal detecting protected circuit, and the current value of described current signal is converted to magnitude of voltage; Obtain multiple magnitude of voltage and calculate average voltage (i.e. the mean value of described multiple magnitude of voltage), judging whether described average voltage is greater than electric leakage set point, if so, then determine ground-fault arc to be detected.

In step S1701, control unit initialization.

In step S1702, release adhesive.

In step S1703, judge whether the electric arc that breaks down.If so, then process enters step S1704, and else process enters step S1705.In another embodiment, can also arrange time of delay (such as 1 second) before the electric arc that judges whether to break down to control unit, this is conducive to control unit and runs more stable.

In step S1704, release is threaded off.Namely protected circuit is disconnected.

In step S1705, judge whether time counter equals 0.Judging whether time counter (such as 3ms counter) equals 0 can as being detect serial type fault electric arc or detect and the Rule of judgment of type fault electric arc.If so, then process enters step S1706, and namely detect and type fault electric arc, else process enters step S1707, namely detects serial type fault electric arc.

In step S1706, and type fault electric arc detects.Detect that the quantity of pulse detects and type fault electric arc by the P1.3 input of control unit and P1.2 input.Such as, the P1.3 input terminal voltage of control unit is greater than 200mV, and counter cnt 1 adds 1,1 testing circuit pulse signal namely detected; P1.2 detects mouth voltage and is greater than 200mV, counter cnt 2 adds 1, namely 1 high-frequency detection pulse signal is detected, control unit judges in the one-period of current signal, whether the quantity of high-frequency detection pulse signal is less than Second Threshold (such as 2), and whether the quantity of testing circuit pulse signal equals the 3rd threshold value (such as 2), if, then be designated as 1 and type electric arc, if and when detecting that within the cycle of continuous predetermined number the number of also type electric arc is more than or equal to the second set point, then determine to detect and type fault electric arc.

In step S1707, serial type fault electric arc detects.Detect that the quantity of testing circuit pulse signal detects serial type fault electric arc by the P1.3 input of control unit.Such as, the P1.3 input terminal voltage of control unit is greater than 200mV, counter cnt 1 adds 1, 1 testing circuit pulse signal detected, due to serial type electric arc occur time, the pulse signal obtained in half period for having certain amplitude, one low one high and between spaced two impulse waveforms, therefore, control unit judges in the one-period of current signal, detect that the quantity of serial type electric arc is more than or equal to first threshold (such as 4), if, be designated as 1 serial type electric arc, if and when detecting that within the cycle of continuous predetermined number the number of serial type electric arc is more than or equal to the first set point, then determine serial type fault electric arc to be detected.

In step S1708, whether the average voltage of detection of electrical leakage is greater than electric leakage set point.If so, then process enters step S1709, and else process enters step S1710.

In step S1709, determine to occur leak current fault, release is threaded off.

In step S1710, faulty indication.Such as, for ground-fault arc: when there is ground-fault arc, the P1.5 output of control unit exports high level, output low level during no ground fault electric arc; For and type fault electric arc: occur and type fault electric arc time, the P1.6 output of control unit exports high level, without and type fault electric arc time output low level; For serial type fault electric arc: when there is serial type fault electric arc, the P1.7 output of control unit exports high level, without output low level during serial type fault electric arc.

In this embodiment, detect respectively three kinds of fault electric arcs, thus make protected circuit safer, Detection results is better.

In step S1801, zero hands over detection interruption to enter.Namely zero the triggering signal of telecommunication of testing circuit is handed over to input to control unit.

In step S1802, voltage half cycle counting V_CNT adds 1.Wherein, the every half period counting of voltage half cycle counting V_CNT adds 1.

In step S1803, setup times counter.3ms counter is such as set, due to electric arc pulse generally 1/4th cycles (about 5ms) appearance before one-period, so can arrange 3ms counter.

In step S1804, judge whether voltage half cycle counting V_CNT equals 2.Namely judge whether to have passed through one-period.If so, then process enters step S1805, otherwise returns, until voltage half cycle counting V_CNT equals 2.

In step S1805, judge whether P1.2 pulse counter CNT2 is less than 2 and whether P1.3 pulse counter CNT1 equals 2.Wherein, P1.2 pulse counter CNT2 refers to that the pulse counter that the high-frequency detection pulse signal received the P1.2 input from control unit counts, P1.3 pulse counter CNT1 refer to the pulse counter that the testing circuit pulse signal received the P1.3 input from control unit counts.If so, then process enters step S1807, and else process enters step S1806.

In step S1806, and type failure counter resets.

In step S1807, and type failure counter adds 1.

In step S1808, judge whether P1.3 pulse counter is more than or equal to 4.If so, then process enters step S1810, and else process enters step S1809.

In step S1809, serial type failure counter resets.

In step S1810, serial type failure counter adds 1.

In step S1811, judge also whether type failure counter is more than or equal to the second set point.If so, then process enters step S1812, and else process enters step S1813.

In step S1812, determine and type fault electric arc, release is threaded off.

In step S1813, judge whether serial type failure counter is more than or equal to the first set point.If so, then process enters step S1814, and else process enters step 1815.

In step S1814, determine serial type fault electric arc, release is threaded off.

In step S1815, P1.2 pulse counter CNT2=0, P1.3 pulse counter CNT1=0, voltage half cycle counting V_CNT=0.Namely P1.2 pulse counter CNT2, P1.3 pulse counter CNT1 and voltage half cycle counting V_CNT is reset, with cycle detection fault electric arc next time.

In step S1901, electric leakage sampling A/D conversion, electric leakage sampling A/D conversion times adds 1.

In step S1902, judge whether electric leakage sampling A/D conversion times is less than number of times set point (such as 50 times).If it is process enters step S1904, and else process enters step S1903.

In step S1903, calculating voltage mean value, number of times resets.

In step S1904, electric leakage sampling A/D conversion value adds up.

In step S1905, judge whether average voltage is greater than electric leakage set point.If so, then process enters step S1906, otherwise returns, and namely again detects leak current fault.

In step S1906, determine leak current fault.Namely determine ground-fault arc to be detected.

In an alternative embodiment of the invention, can also judge before step S1901 to detect whether electric leakage mark is 1, namely judge whether to carry out detection of electrical leakage, if so, then carry out step S1901, otherwise carry out process and make to detect electric leakage and be masked as 1.

So far, the present invention is described in detail.In order to avoid covering design of the present invention, details more known in the field are not described.Those skilled in the art, according to description above, can understand how to implement technical scheme disclosed herein completely.

Method and system of the present invention may be realized in many ways.Such as, any combination by software, hardware, firmware or software, hardware, firmware realizes method and system of the present invention.Said sequence for the step of described method is only to be described, and the step of method of the present invention is not limited to above specifically described order, unless specifically stated otherwise.In addition, in certain embodiments, can be also record program in the recording medium by the invention process, these programs comprise the machine readable instructions for realizing according to method of the present invention.Thus, the present invention also covers the recording medium stored for performing the program according to method of the present invention.

Although be described in detail specific embodiments more of the present invention by example, it should be appreciated by those skilled in the art, above example is only to be described, instead of in order to limit the scope of the invention.It should be appreciated by those skilled in the art, can without departing from the scope and spirit of the present invention, above embodiment be modified.Scope of the present invention is limited by claims.

Claims

1. a fault arc protection device, is characterized in that, comprising:

Pulse-detecting circuit (400), obtains testing circuit pulse signal for carrying out sampling to the current signal of protective circuit, described testing circuit pulse signal is sent to control unit (200);

Zero hands over testing circuit (500), for when the current value described current signal being detected is zero, sends trigger the signal of telecommunication to described control unit (200);

Control unit (200), carries out periodicity analysis with detection failure electric arc based on the described triggering signal of telecommunication to described testing circuit pulse signal.

2. fault arc protection device according to claim 1, is characterized in that,

Described control unit (200) starts described testing circuit pulse count signal after receiving the described triggering signal of telecommunication, when detecting that in the one-period of current signal the quantity of described testing circuit pulse signal is more than or equal to first threshold, be designated as 1 serial type electric arc.

3. fault arc protection device according to claim 2, is characterized in that,

Described control unit (200) judges within the cycle of continuous predetermined number, detect whether the quantity of serial type electric arc is more than or equal to the first set point, if so, then determines serial type fault electric arc to be detected.

4. fault arc protection device according to claim 2; it is characterized in that; if described control unit (200) detects low high two testing circuit pulse signals in the half period of current signal, then determine to occur serial type electric arc in protected circuit.

5. fault arc protection device according to claim 2, it is characterized in that, described first threshold is 4.

6. fault arc protection device according to claim 1, it is characterized in that, described pulse-detecting circuit (400) comprising: current transformer (401), the first resistance (R22), the second resistance (R17), the first full bridge rectifier (402) and the first electric capacity (C10); Wherein,

First output pin of the secondary coil of described current transformer (401) is connected to the first end of described first resistance (R22), second end of described first resistance (R22) is connected to the first end of described first full bridge rectifier (402), second output pin of the secondary coil of described current transformer (401) is connected to the 3rd end of described first full bridge rectifier (402), second end ground connection of described first full bridge rectifier (402), 4th end of described first full bridge rectifier (402) is connected to the first end of described second resistance (R17), second end ground connection of described second resistance (R17), and the first end of described second resistance (R17) is connected to the first input end (P1.3) of described control unit (200), one end of described first electric capacity (C10) is connected to the first end of described second resistance (R17), other end ground connection.

7. fault arc protection device according to claim 6; it is characterized in that; described pulse-detecting circuit (400) also comprises: the 3rd resistance (R18), the 4th resistance (R21) and the first voltage stabilizing didoe (D8), wherein

The first end of described second resistance (R17) is connected to the first end of described 3rd resistance (R18), second end of described 3rd resistance (R18) and the first input end (P1.3) of the described first end of the 4th resistance (R21), the negative electrode of described first voltage stabilizing didoe (D8) and described control unit (200) connect altogether, described second end of the 4th resistance (R21) and the equal ground connection of anode of described first voltage stabilizing didoe (D8).

8., according to the arbitrary described fault arc protection device of claim 1 to 7, it is characterized in that, also comprise:

High fdrequency component testing circuit (600), for detecting the high frequency harmonic components in the current signal of described protected circuit, and sampling acquisition high-frequency detection pulse signal is carried out to described high frequency harmonic components, described high-frequency detection pulse signal is inputed to described control unit (200);

Wherein, described control unit (200) starts described high-frequency detection pulse count signal after receiving the described triggering signal of telecommunication, judge in the one-period of current signal, whether the quantity of high-frequency detection pulse signal is less than Second Threshold, and whether the quantity of testing circuit pulse signal equals the 3rd threshold value, if so, then 1 is designated as and type electric arc.

9. fault arc protection device according to claim 8, is characterized in that,

Described control unit (200) judges to detect within the cycle of continuous predetermined number and whether the quantity of type electric arc is more than or equal to the second set point, if so, then determines to detect and type fault electric arc.

10. fault arc protection device according to claim 8, it is characterized in that, described Second Threshold is 2, and described 3rd threshold value is 2.

11. fault arc protection devices according to claim 8; it is characterized in that; described high fdrequency component testing circuit (600) comprising: the second electric capacity (C11), the second full bridge rectifier (603), the 3rd electric capacity (C12) and the 5th resistance (R20); wherein

One end of described second electric capacity (C11) connects the first output pin of the secondary coil of described current transformer (401), the other end is connected to the first end of described second full bridge rectifier (603), second output pin of the secondary coil of described current transformer (401) is connected to the 3rd end of described second full bridge rectifier (603), second end ground connection of described second full bridge rectifier (603), 4th end of described second full bridge rectifier (603) connects and described 3rd electric capacity (C12) one end, the first end of described 5th resistance (R20) and the 3rd input (P1.2) of described control unit (200) connect altogether, the equal ground connection of second end of described 3rd electric capacity (C12) other end and described 5th resistance (R20).

12., according to fault arc protection device described in claim 11, is characterized in that, the current transformer that described current transformer (401) is high permeability core material.

13. fault arc protection devices according to claim 1, is characterized in that, also comprise:

Electric-leakage detection circuit (700), for detecting the current signal of protected circuit, is converted to magnitude of voltage by the current value of described current signal, and described magnitude of voltage is inputed to described control unit (200);

Wherein, described control unit (200) obtains multiple described magnitude of voltage and calculates average voltage, judges whether described average voltage is greater than electric leakage set point, if so, then determines ground-fault arc to be detected.

14., according to fault arc protection device described in claim 13, is characterized in that, also comprise:

Test circuit (800), for generating measuring current in described protected circuit, during to determine that electric leakage occurs described protected circuit, whether described protective circuit (300) disconnects described protected circuit.

15. fault arc protection devices according to claim 1, is characterized in that, also comprise:

Reset circuit (900), for sending reset signal to described control unit (200),

Wherein, described control unit (200) is receiving the laggard horizontal reset operation of described reset signal.

16. fault arc protection devices according to claim 1, is characterized in that, also comprise:

Protective circuit (300), when receiving the open circuit control signal that described control unit (200) exports, disconnects described protected circuit; Wherein, described control unit (200), when determining fault electric arc to be detected, sends open circuit control signal to described protective circuit (300);

Power circuit (100), for handing over testing circuit (500) power supply for described control unit (200) and described zero.

17. 1 kinds of fault electric arc guard methods, is characterized in that, comprising:

The current signal of protected circuit is sampled, obtains testing circuit pulse signal;

When the current value described current signal being detected is zero, generates and trigger the signal of telecommunication;

Based on the described triggering signal of telecommunication, periodicity analysis is carried out with detection failure electric arc to described testing circuit pulse signal.

18., according to fault electric arc guard method described in claim 17, is characterized in that, comprising:

Starting after receiving the described triggering signal of telecommunication described testing circuit pulse count signal, when detecting that in the one-period of current signal the quantity of described testing circuit pulse signal is more than or equal to first threshold, being designated as 1 serial type electric arc.

19., according to fault electric arc guard method described in claim 18, is characterized in that,

Judge within the cycle of continuous predetermined number, detect whether the quantity of serial type electric arc is more than or equal to the first set point, if so, then determine serial type fault electric arc to be detected.

20., according to fault electric arc guard method described in claim 18, is characterized in that, comprising:

If low high two testing circuit pulse signals detected in the half period of current signal, then determine to occur serial type electric arc in protected circuit.

21., according to fault electric arc guard method described in claim 18, is characterized in that, described first threshold is 4.

22., according to fault electric arc guard method described in claim 17, is characterized in that, comprising:

Sampling is carried out to the high frequency harmonic components in the current signal of described protected circuit and obtains high-frequency detection pulse signal;

Start after receiving the described triggering signal of telecommunication described high-frequency detection pulse count signal, judge in the one-period of current signal, whether the quantity of high-frequency detection pulse signal is less than Second Threshold, and whether the quantity of testing circuit pulse signal equals the 3rd threshold value, if so, then 1 is designated as and type electric arc.

23., according to fault electric arc guard method described in claim 22, is characterized in that,

Judge to detect within the cycle of continuous predetermined number whether the quantity of also type electric arc is more than or equal to the second set point, if so, then determine to detect and type fault electric arc.

24., according to fault electric arc guard method described in claim 22, is characterized in that, described Second Threshold is 2, and described 3rd threshold value is 2.

25., according to fault electric arc guard method described in claim 17, is characterized in that, comprising:

Detect the current signal of protected circuit, the current value of described current signal is converted to magnitude of voltage;

Obtain multiple described magnitude of voltage and calculate average voltage, judging whether described average voltage is greater than electric leakage set point, if so, then determining ground-fault arc to be detected.