CN103354344B - The extracting method of a kind of company quick-fried type short circuit signal - Google Patents
The extracting method of a kind of company quick-fried type short circuit signal Download PDFInfo
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Abstract
An extracting method for company's quick-fried type short circuit signal, when it utilizes short circuit, the feature of the instantaneous positive negative pulse stuffing ripple electric current of quick-fried generation, realizes the extraction to quick-fried some signal, and to burn short circuit in conjunction with earth leakage protective device and control.So just can be not enough to make short-circuit of air switch trip to some short circuit currents and the short circuit that formed is burnt and carried out auto-cutout and control, thus reduce the generation that electricity burns; Owing to combining with original earth leakage protective device, therefore control circuit is simple, and cost is lower, is a kind ofly to design ingenious, practical anti-electric baked wheaten cake technical scheme.
Description
Technical field
The invention belongs to fire-fighting domain, especially relate to the extracting method of a kind of company quick-fried type short circuit signal.
Background technology
Electricity is burnt, general is all due to after electric wire aging (or shoddy), caused electric leakage before this, rear formation ohmic leakage heating, heat accelerates insulating barrier ageing of plastics again, finally peel off, two wires are gradually moved asymptotic, last two wire short circuits, the aging short circuit of electric wire specifically can be divided into again three kinds of situations: the first is the short circuit of electric wire heavy in section, also very large (as 1 square millimeter, cross section copper cash by electric current, short circuit current can reach 104A), as long as therefore fuse or air circuit are good, then can trip in time, can not baked wheaten cake be caused, the second is that the short circuit of electric wire small bore is (as two wires contacting section is less than 0.1 square millimeter, short circuit current is less than 10A), because short circuit current is less than the rated current of air circuit, (rated current of present family air circuit is that 40A is in the majority, and the short circuit tripping current of general air circuit will be 6 times of rated current), so air circuit does not trip, and the transcient short circuit time of 0.1 square metre, heat energy and quick-fried power less, difficulty makes insulating plastic layer melt and electric wire displacement is collided causes electric wire short circuit again, therefore, only hear in experiment " " a sound, short circuit place electric wire blows, short circuit is not stretched, the third is the cross section short circuit of electric wire moderate, though short circuit current is larger, but still be less than rated current or tripping current, therefore only with the sensitivity improving disconnect or fuse, can not burn by protection circuit completely, the short circuit of moderate cross section due to electric current larger, it can produce at transcient short circuit time can melt the heat of wire insulation and larger quick-fried power, therefore can in short-term in make wire short circuit several times in succession, the quick-fried type short circuit of our company of being referred to as, some data show, the quick-fried type short circuit of this company is the arch-criminal causing electricity to burn just.The author is through studying observation for many years, use wiring board to be the most easily occur to connect quick-fried type open circuit, due to wiring board line is multiple cord, and short circuit starts often only to blow its a small amount of several cores, so occur to connect quick-fried type short circuit, the explosion in succession during wire short circuit as set off firecrackers, give out light, sounding.Because current wire-insulating material often adopts the plastics of band anti-flammability, therefore observe by experiment afterwards, the open circuit of moderate cross section is within 0.5 to 1 second, as long as disconnected by power supply immediately, insulating plastic layer has little time burning, just smolders; Electric wire just catching fire after 1 second, as long as but cut off the electricity supply immediately, fire also can fire from whereabouts immediately.For sake of convenience, we are existing is called quick-fried point, the instant pulse current that quick-fried some wire produces by connecting short circuit place of quick-fried type, and we claim it to be quick-fried some pulse current.It should be noted that the electricity that the quick-fried type short circuit of this company causes is burnt paroxysmal often, it often occurs in night when people do not make electrical appliance, and voltage raises at that time, and the aging wire of not short circuit originally, at this moment just will produce short circuit suddenly; Again because electrical appliance in the late into the night is few, even if pulse current is high, the total current value flowing through air switch is also lower, and switch not easily trips.Because this baked wheaten cake is very hidden again, after burning, Melted mark caused by short circuit is often damaged, and is difficult to the attention causing people, though therefore connecting that quick-fried type short circuit burns is the arch-criminal that electricity is burnt, the how generation of the quick-fried type short circuit and fire hazard of companys of preventing, people discuss but and seldom.I is also because witnessed that the quick-fried type short circuit of this company just starts the research of this respect.
Summary of the invention
The object of the invention is: the extracting method releasing a kind of company quick-fried type short circuit signal, controlling phase line grounding by connecting quick-fried type short circuit signal, it and earth leakage protective device being combined, thus increases effective strick precaution that short circuit is burnt.
The object of the present invention is achieved like this: it comprises a primary coil and is serially connected in current transformer on electricity consumption line load, the induced current of the secondary coil acquisition of current transformer is after normal state current flat ripple device rectification and filtering, enter into the primary coil of quick-fried some pulse induction transformer, the secondary of quick-fried some pulse induction transformer is provided with direct impulse coil and negative-going pulse coil, direct impulse coil and negative-going pulse coil access two inputs on transient pulse and gate open road respectively, pulse obstruction device by a narrow margin is also connected in series in direct impulse coil, the output on transient pulse and gate open road controls magnetic reed switch after cutting up-to-date style anti-jamming circuit, two normally opened contacts of magnetic reed switch, one of them normally opened contact connects phase line through resistance, another normally opened contact connects the earth, it is characterized in that: the feature of quick-fried generation instantaneous positive negative pulse stuffing ripple electric current when utilizing short circuit, realize the extraction to quick-fried some signal, and in conjunction with earth leakage protective device, short circuit baked wheaten cake is controlled.
Like this, normality alternating current is by after flat ripple device, 50 hertz of AC signal that instrument transformer is obtained from electricity consumption line load become DC signal, therefore can not again by quick-fried some pulse induction transformer (hereinafter referred to as the quick-fried some Pulse induction device) B2 in Fig. 2, so the forward electric wave of the induced voltage rising only during remaining load change or the instantaneous generation of reduction or negative sense electric wave, and transient pulse electric wave during short circuit is just by Pulse induction device, and because pulse obstruction device string is by a narrow margin in the secondary direct impulse outlet line of inductor, has thus stopped in load impulse disturbances electric wave by a narrow margin and entered transient pulse and gate open road, meanwhile at transient pulse and a section up-to-date style anti-jamming circuit of going here and there between gate open road and magnetic reed switch coil, in preignition period after disturbing pulse is started, (namely 1 second is interior) all interference electric waves are all amputated, thus can not to magnetic reed switch generation effect, and connect the feature that quick-fried type short circuit has successively generation transient pulse, its duration will substantially exceed 1 second, and its pulse amplitude also will be greater than pulse obstruction device threshold value (threshold value of pulse obstruction device is generally set to the electric current being greater than single household electrical appliance by a narrow margin) by a narrow margin, therefore after the preignition period of 1 second, being namely opened with door Y2 of up-to-date style anti-jamming circuit is cut, then magnetic reed switch is connected, earth leakage protective device is finally made to trip.Specifically with regard to household electrical appliance, as air conditioner, electric fan etc., because electric current during electricity consumption is all only in rising trend, until electric current can be just unexpected downward trend when closing motor or electrical appliance, due to household electrical appliance open and close between be not instantaneous, therefore just do not have instantaneous positive negative pulse stuffing ripple, then secondary coil L4 and L5 of quick-fried some Pulse induction device B2 can not produce instantaneous positive and negative two kinds of pulses, namely occur without connecting quick-fried type signal electric current, therefore earth leakage protective device also would not trip at ordinary times; And for the cold light source lamp resemble electricity-saving lamp, though have instantaneous positive negative pulse stuffing ripple when starting, but these light fixture power consumptions are all very little, general electric current only has 0.1A, even electric current increases by 10 times when starting, does not also exceed 1A; And household electrical appliance not only electric current is little, electric wire is also all coiled into circle, has the inhibitory action in magnetic field when electric current rises, so induced current pulse amplitude is little, lower than the threshold value of pulse obstruction device by a narrow margin; If accidentally there will be instantaneous disturbance during people's toggle switch; because toggle switch is all complete instantaneously; can not be greater than the preignition period of 1 second; and as still having by pulse obstruction device by a narrow margin and the electric current cutting up-to-date style anti-jamming circuit after 1 second; then it can only be the quick-fried some electric current occurred continuously; only have quick-fried some electric current that magnetic reed switch just can be made to connect, make phase current leak ground, earth leakage protective device is tripped.In summary owing to just accurately can extract the quick-fried some signal produced when connecting quick-fried type short circuit by normal state current flat ripple device, by a narrow margin pulse obstruction device with after cutting up-to-date style anti-jamming circuit.Because said apparatus also combines with earth leakage protective device, make use of highly sensitive, the high reliability of earth leakage protective device, because this reducing production cost, convenient sale.Do not affect original protective device in circuit owing to using during this patent, thus do not affect original circuit protection function.
Accompanying drawing explanation
Fig. 1 is the block diagram connecting quick-fried type short circuit signal extracting method.
Fig. 2 is circuit working schematic diagram of the present invention.
Embodiment
Fig. 1 is the block diagram connecting quick-fried type short circuit signal extracting method.In figure, a is power supply, and b is switch for leakage protector, and c is load; d is current transformer; e is the flat ripple device of normal state current with full-wave rectification and filter capacitor, and f is the secondary negative-going pulse of inductor, and g is the secondary direct impulse of inductor; h is with primary coil and the positive and negative quick-fried some Pulse induction device to two secondary coils; j is pulse obstruction device by a narrow margin, and k is transient pulse and gate open road, and i cuts a up-to-date style anti-jamming circuit; m is magnetic reed switch coil, and n is magnetic reed switch contact (often opening).Power supply a is powered to load c by switch for leakage protector b, current transformer d obtains load current signal by its primary coil from load c, and current transformer d secondary on induce alternating current, this alternating current becomes the primary coil that direct current enters into quick-fried some Pulse induction device h after carrying out rectification and filtering by normal state current flat ripple device e, the secondary direct impulse g of inductor of quick-fried some Pulse induction device h is after pulse obstruction device j screens by a narrow margin, the electric current allowing to be greater than pulse obstruction device threshold value by a narrow margin arrives an input of transient pulse and gate open road k, the secondary negative-going pulse f of inductor of quick-fried some Pulse induction device h then directly arrives another input of transient pulse and gate open road k, though the time cycle of quick-fried some pulse is very short, but be furnished with input capacitance due to above-mentioned with door input, therefore when a transient pulse (as quick-fried some pulse) as long as the secondary direct impulse voltage of inductor is greater than pulse obstruction device threshold voltage by a narrow margin when arriving, then inductor negative-going pulse f arrive time and door two inputs all in malleation, namely transient pulse and gate open road k have output current, start the period to act on when (as 1 second) has and cuts to above-mentioned output current owing to cutting up-to-date style anti-jamming circuit i again, therefore above-mentioned output current just can make magnetic reed switch coil m obtain electric after only having 1 second, thus make the n adhesive of magnetic reed switch contact, because the normally opened contact of two in magnetic reed switch connects phase line and the earth respectively, the two is once adhesive, namely the phase current being enough to switch for leakage protector b is tripped can be made to enter ground, therefore when occurring in loaded line connecting quick-fried type short circuit pulse electric current, and the continuous impulse period is when being greater than 1 second, then earth leakage protective device will trip, circuit is just protected, and the fluorescent lamp (or electricity-saving lamp) of the brief burst caused once in a while during people's toggle switch and low current is disturbed, not by pulse obstruction device j by a narrow margin with cut a up-to-date style anti-jamming circuit i.
Fig. 2 is circuit working schematic diagram of the present invention.In Fig. 1, CH is earth leakage protective device, K1, K2 is the air circuit switch combined with earth leakage protective device, A represents the phase line of alternating current 220V power supply, when arrow represents electricity consumption, wire leads to load direction, B1 is current transformer, L1, L2 is primary coil and the secondary coil of current transformer respectively, D1, D2, D3, D4 is the full-wave rectifying circuit in the flat ripple device of normal state current, C1 is the filter capacitor in the flat ripple device of normal state current, B2 is quick-fried some Pulse induction device, L3, L4, L5 is the primary coil of quick-fried some Pulse induction device respectively, secondary positive pulse coil and secondary negative pulse coil, D5, D6 is just, the detector diode of negative pulse coil, C2, C3 is two input capacitances of AND circuit Y1, resistance R1, R2 forms pulse obstruction device by a narrow margin, in order to the threshold value of pulse obstruction device by a narrow margin can be aligned, R1 is adjustable resistance, R3 is current-limiting resistance, R4 is input resistance, C5 is charging capacitor, diode D7, electric capacity C4, the triode BG being in cut-off state at ordinary times, monostable flipflop Z, time relay S, reverser T and form together with door Y2 cut a up-to-date style anti-jamming circuit, G is magnetic reed switch, and L6 is magnetic reed switch coil, and C6 is the shunt capacitance of magnetic reed switch coil, and K3, K4 are two normally opened contacts of magnetic reed switch, and R5 is current-limiting resistance.
After having load to occur in circuit, 50 hertz of alternating currents are had to pass through in the elementary L1 of instrument transformer B1, namely secondary L2 has induced electromotive force, induced current carries out after full-wave rectification through diode D1, D2, D3, D4, filtering is carried out again through electric capacity C1, thus, when the load in circuit is steady, when electric current is in stable, two ends of electric capacity C1 are constant DC voltage values, namely coil L3 bis-end does not have fluctuation voltage, therefore the secondary positive pulse coil L4 of quick-fried some Pulse induction device B2 at ordinary times, and influence electricity kinetic potential on secondary negative pulse coil L5.And when circuit is short-circuited, if heavy in section short circuit, then electric current substantially exceeds rated current, air circuit switch motion, K1, K2 disconnect, dump.If daily electrical equipment appearance is instant pulse current, then the upper electromotive force of L4, L5 is less, electric current will be shunted by resistance R1, R2, voltage between two resistance has not reached and has made diode D6 conducting voltage (threshold value), can not obtain electric with an input of door Y1, namely can not open with door Y1, then also can not open with door Y2, magnetic reed switch can not work.If occur to connect quick-fried type short circuit, at this moment short circuit current is larger, then the upper electromotive force of coil L4, L5 is larger, though the output current of L4 is shunted by resistance R1, R2, but the voltage between two resistance still can arrive the threshold voltage making diode current flow, obtain electric with the right input of door Y1, and by electric capacity C3, voltage is kept an instantaneous value, between this instantaneous value, be blown because short circuit electric wire is instantaneous, and making the positive voltage that on L5, appearance one is reverse, this voltage acts on the left input with door Y1 through D5, open-minded with door Y1.The instantaneous disturbance owing to producing during people's toggle switch is there is in order to prevent occasional in circuit, therefore with the output of door Y1 on the right of also establish one cut up-to-date style anti-jamming circuit, its operation principle is: when first pulse starts, a malleation is exported with door Y1, charge to electric capacity 5 through resistance R3 in one tunnel of this positive current voltage, charging makes to obtain with the door Y2 left side input positive electricity time instantaneous delaying, meanwhile charge to electric capacity C4 through diode D7 with another road of door Y1 output positive current, charging current makes the input of reverser T obtain positive electricity, and make the output of T become negative pressure from original malleation, R5 is the earth resistance of reverser, after 1 second, namely capacitor is full of electricity, namely reverser T input replys negative pressure, namely inverter output also reforms pressure, reverser T output is negative time span i.e. said preignition period above, owing to being negative with the right input of door Y2 in this preignition period, therefore Y2 does not export, thus realize rejecting with cutting up-to-date style the object disturbing signal, after the pulse in preignition period is by electric capacity C4 full charge, on the right of Y2, trigger end keeps malleation, at this moment if connect quick-fried type short circuit, the quick-fried some pulse that then certainly will have outside preignition period appears at the output of Y1, but pulse at this moment no longer plays charging effect (because at this moment electric capacity is sufficient) to electric capacity C4, so trigger end keeps malleation constant on the right of Y2, as long as so there be quick-fried some pulse outside preignition period to occur, namely two inputs of Y2 are all malleation, namely Y2 has output current, namely coil L6 obtains electric, the two contact K3 of magnetic reed switch G, K4 adhesive, phase current is through resistance R5 ground connection, because set electrical leakage and electric leakage time are all greater than the tripping operation index of earth leakage protective device CH, therefore earth leakage protective device will make load power source disconnect, connect quick-fried type short circuit in such wire just to start, power supply just disconnects, therefore electricity is burnt and can not be formed.Just when above-mentioned reverser T output is negative pressure, time relay S is triggered (this relay is negative triggering), time relay S time delay exports trigger current to monostable flipflop Z after a few second, monostable flipflop Z is overturn, namely Z exports positive electricity, by originally obstructed triode BG conducting, within several seconds that monostable flipflop Z overturns, electric capacity C4 and C5 will discharge, and at this moment cut up-to-date style anti-jamming circuit and restore again.
Claims (1)
1. the extracting method of company's quick-fried type short circuit signal, it comprises a primary coil and is serially connected in current transformer on electricity consumption line load, the induced current of the secondary coil acquisition of current transformer is after normal state current flat ripple device rectification and filtering, enter into the primary coil of quick-fried some pulse induction transformer, the secondary of quick-fried some pulse induction transformer is provided with direct impulse coil and negative-going pulse coil, direct impulse coil and negative-going pulse coil access two inputs on transient pulse and gate open road respectively, pulse obstruction device by a narrow margin is also connected in series in direct impulse coil, the output on transient pulse and gate open road controls magnetic reed switch after cutting up-to-date style anti-jamming circuit, two normally opened contacts of magnetic reed switch, one of them normally opened contact connects phase line through resistance, another normally opened contact connects the earth, above-mentioned section of up-to-date style anti-jamming circuit can by diode (D7), electric capacity (C4), be in the triode (BG) of cut-off state at ordinary times, monostable flipflop (Z), the time relay (S), reverser (T) and forming together with door (Y2), wherein an end of diode (D7) is connected on the output on above-mentioned transient pulse and gate open road, the other end and the electric capacity (C4) of diode (D7) connect, the other end of electric capacity (C4) is connected on the input of reverser (T) and the junction of input resistance (R4), the emitter and collector being in the triode (BG) of cut-off state is at ordinary times connected across two ends of electric capacity (C4) respectively, the output of monostable flipflop (Z) and be in the base stage electrical connection of triode (BG) of cut-off state at ordinary times, the output of the input termination time relay (S) of monostable flipflop (Z), the trigger end of the time relay (S) connects the output of reverser (T) and the input with door (Y2), it is characterized in that: the feature of quick-fried generation instantaneous positive negative pulse stuffing ripple electric current when utilizing short circuit, realizes the extraction to quick-fried some signal, and in conjunction with earth leakage protective device short circuit burnt and control.
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| CN104201912B (en) * | 2014-08-15 | 2017-12-26 | 京东方科技集团股份有限公司 | A kind of AC DC converters, power panel and display device |
| CN106356805A (en) * | 2016-08-22 | 2017-01-25 | 陈宜中 | Method for endowing shortcircuit burning self-cut-off device with air switch hot stripping function |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2072737U (en) * | 1990-06-20 | 1991-03-06 | 中国航空工业民品开发公司 | Multi-functional safety device for electric equipments |
| CN2110939U (en) * | 1991-08-28 | 1992-07-22 | 贾昌河 | Multifunctional protection circuit breaker for motor |
| CN2301788Y (en) * | 1997-04-09 | 1998-12-23 | 赵栓 | Electronic controlled AC contactor |
| CN1691453A (en) * | 2004-04-23 | 2005-11-02 | 爱普罗国际电气（中山）有限公司 | Safety power utilization protector |
| CN202217877U (en) * | 2011-04-29 | 2012-05-09 | 吴敏 | Multifunctional timing energy-saving security power socket |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4964536B2 (en) * | 2006-08-31 | 2012-07-04 | 矢崎総業株式会社 | Motor abnormality detection device and method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2072737U (en) * | 1990-06-20 | 1991-03-06 | 中国航空工业民品开发公司 | Multi-functional safety device for electric equipments |
| CN2110939U (en) * | 1991-08-28 | 1992-07-22 | 贾昌河 | Multifunctional protection circuit breaker for motor |
| CN2301788Y (en) * | 1997-04-09 | 1998-12-23 | 赵栓 | Electronic controlled AC contactor |
| CN1691453A (en) * | 2004-04-23 | 2005-11-02 | 爱普罗国际电气（中山）有限公司 | Safety power utilization protector |
| CN202217877U (en) * | 2011-04-29 | 2012-05-09 | 吴敏 | Multifunctional timing energy-saving security power socket |
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Effective date of registration: 20201021 Address after: Room a1309, No. 109, Shazhou West Road, yangshe Town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee after: Suzhou yifanghua Intellectual Property Operation Co., Ltd Address before: Jiaxing City, Zhejiang province 314033 Hexing Road, building 47 room 505 West Bridge Patentee before: Chen Yizhong |
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