CN103354344A - Method for extracting explosion-continuous short circuit signal - Google Patents
Method for extracting explosion-continuous short circuit signal Download PDFInfo
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Abstract
Provided is a method for extracting an explosion-continuous short circuit signal. The method is characterized by utilizing the features of an instantaneous positive and negative pulse current which is produced at an explosion point during short circuiting, and thus extraction of the explosion point signal is realized; and combining a leakage protector to control short-circuit burning. Therefore, the short-circuit burning, which is caused for the reason that a short-circuit current is not large enough to enable an air short-circuit switch to trip, is performed an automatic circuit-breaking control, and electric fire cases can be reduced; the original leakage protector is combined, so that circuit control is simple and the cost is low; and thus the method is an ingeniously-designed, highly-practical anti-electric fire 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, generally all be because behind the electric wire aging (or shoddy), caused before this electric leakage, rear formation ohmic leakage heating, heat accelerates the insulating barrier ageing of plastics again, peel off at last, it is asymptotic that two wires are gradually moved, 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, and is also very large (such as the 1 square millimeter of copper cash in cross section by electric current, short circuit current can reach 104A), therefore as long as fuse or air circuit are good, then can both in time trip, can not cause baked wheaten cake; The second is that the short circuit of electric wire small bore is (such as the two wires contacting section less than 0.1 square millimeter, short circuit current is less than 10A), (rated current of family's air circuit is that 40A is in the majority now because short circuit current is less than the rated current of air circuit, and the short circuit tripping current of general air circuit will be 6 times of rated current), so air circuit does not trip, and 0.1 square metre transcient short circuit time, heat energy and quick-fried power are less, difficulty is collided the fusing of the insulated plastic bed of material and electric wire displacement and is caused again short circuit of electric wire, therefore, only hear in the experiment " " one, 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 less than rated current or tripping current; therefore only with the sensitivity that improves disconnect or fuse; protection circuit does not burn fully; the short circuit of moderate cross section is because electric current is larger; it can produce at transcient short circuit time can melt the heat of wire insulation and larger quick-fried power; therefore make in succession several times short circuit of wire in can be in short-term; the quick-fried type short circuit of our company of being referred to as; some data show that the quick-fried type short circuit of this company is the arch-criminal who causes that electricity is burnt just.The author observes through for many years research, using that wiring board is the easiest to be connected quick-fried type and open circuit, is multiple cord because the wiring board line uses, and short circuit begins often only to blow its a small amount of several cores, so occur to connect quick-fried type short circuit, the in succession explosion during the wire short circuit as set off firecrackers, give out light, sounding.Because therefore the normal plastics that adopt with anti-flammability of wire-insulating material were observed afterwards by experiment at present, opened circuit within 0.5 to 1 second in the moderate cross section, as long as immediately power supply is disconnected, the insulated plastic bed of material has little time to burn, and just smolders; Electric wire ability catching fire after 1 second, but as long as cut off the electricity supply immediately, fire also can fire from whereabouts immediately.For sake of convenience, we now connect short circuit place of quick-fried type and are called quick-fried point, the quick-fried some transient pulse electric current that wire produces, and we claim that it is quick-fried some pulse current.It should be noted that electricity that the quick-fried type short circuit of this company causes burns paroxysmally often, at the night when it often occurs in people and does not make electrical appliance, voltage raises at that time, and at this moment the aging wire of originally not short circuit just will produce suddenly short circuit; Again because of the late into the night electrical appliance few, even pulse current is high, the total current value that flows through air switch is also lower, switch is difficult for tripping operation.Because this baked wheaten cake is very hidden again, Melted mark caused by short circuit often is damaged after burning, and is difficult to cause people's attention, is the arch-criminal that electricity is burnt though connect therefore that quick-fried type short circuit burns, the how generation of the quick-fried type short circuit and fire hazard of companys of preventing, and people discuss but and seldom.I also am because witnessed that the quick-fried type short circuit of this company just begins the research of this respect.
Summary of the invention
The objective of the invention is: release the extracting method of a kind of company quick-fried type short circuit signal, by connecting quick-fried type short circuit signal control phase line grounding, it and earth leakage protective device are combined, thereby increase effective strick precaution that short circuit is burnt.
The object of the present invention is achieved like this: it comprises that a primary coil is serially connected in the current transformer on the electricity consumption line load; the induced current that the secondary coil of current transformer obtains is after the flat ripple device rectification of normality electric current and filtering; enter into the primary coil of quick-fried some pulse induction transformer; secondary direct impulse coil and the negative-going pulse coil of being provided with of quick-fried some pulse induction transformer; direct impulse coil and negative-going pulse coil access respectively two inputs on transient pulse and gate open road; also be connected in series by a narrow margin pulse obstruction device in the direct impulse coil; the output on transient pulse and gate open road is controlled magnetic reed switch after cutting the 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: quick-fried point produces the feature of instantaneous positive negative pulse stuffing ripple electric current when utilizing short circuit; realization is to the extraction of quick-fried some signal, and in conjunction with earth leakage protective device short circuit burnt and to control.
Like this, the normality alternating current is by behind the flat ripple device, make instrument transformer become dc signal from 50 hertz of AC signal that the electricity consumption line load obtains, therefore can not be again by quick-fried some pulse induction transformer (hereinafter to be referred as the quick-fried some Pulse induction device) B2 among Fig. 2, so only the induced voltage during remaining load change raises or forward electric wave or the negative sense electric wave of the instantaneous generation that reduces, and the transient pulse electric wave during short circuit could pass through Pulse induction device; And since by a narrow margin pulse obstruction device string in the secondary direct impulse outlet line of inductor, thereby stopped in the load by a narrow margin that the impulse disturbances electric wave enters transient pulse and gate open road; Meanwhile string has the up-to-date style anti-jamming circuit of cutting between transient pulse and gate open road and magnetic reed switch coil; (namely in 1 second) all interference electric waves are all by amputation in the preignition period after disturbing pulse is begun; thereby can not be to magnetic reed switch generation effect; has the feature of successive generation transient pulse and connect quick-fried type short circuit; 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 generally is made as the electric current greater than single household electrical appliance by a narrow margin) by a narrow margin; therefore behind 1 second preignition period, cut namely being opened with door Y2 of up-to-date style anti-jamming circuit; then magnetic reed switch is connected, and finally makes the earth leakage protective device tripping operation.Specifically with regard to household electrical appliance, such as air conditioner, electric fan etc., because electric current is all only in rising trend during electricity consumption, electric current just can be unexpected downward trend when closing motor or electrical appliance, because be not instantaneous between the household electrical appliance opening and closing, so just there is not instantaneous positive negative pulse stuffing ripple, then the secondary coil L4 of quick-fried some Pulse induction device B2 and L5 can not produce instantaneous positive and negative two kinds of pulses, earth leakage protective device namely occurs without connecting quick-fried type signal electric current, so just can not trip yet at ordinary times; And for the cold light source lamp resemble the electricity-saving lamp, though when starting, instantaneous positive negative pulse stuffing ripple is arranged, these light fixture power consumptions are all very little, and 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 are little, and electric wire is coiled circles all also, and the inhibitory action in magnetic field is arranged during Current rise, so the induced current pulse amplitude is little, are lower than the by a narrow margin threshold value of pulse obstruction device; If instantaneous disturbance can occur accidentally during people's toggle switch; because toggle switch all is to finish moment; it can not the preignition period greater than 1 second; and can pass through by a narrow margin pulse obstruction device and the electric current that cuts the up-to-date style anti-jamming circuit as still having after 1 second; then it can only be the quick-fried some electric current that occurs continuously; only have quick-fried some electric current to make phase current leak ground so that magnetic reed switch is connected, make the earth leakage protective device tripping operation.In summary since by the flat ripple device of normal state current, by a narrow margin the pulse obstruction device and cut the up-to-date style anti-jamming circuit after quick-fried some signal producing just can be to the quick-fried type short circuit of company the time accurately extract.Since said apparatus also with the earth leakage protective device combination, utilized highly sensitive, the high reliability of earth leakage protective device, therefore reduced production cost, the convenient sale.Owing to do not affect original protective device in the circuit when using this patent, thereby do not affect original circuit protection function.
Description of drawings
Fig. 1 is the block diagram that connects 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 that connects quick-fried type short circuit signal extracting method.A is power supply among the figure, and b is switch for leakage protector, and c is load; d is current transformer; e is with the flat ripple device of the normal state current of 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 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 the magnetic reed switch coil, and n is magnetic reed switch contact (often opening).Power supply a powers to load c by switch for leakage protector b, current transformer d obtains the load current signal by its primary coil from load c, and at the secondary alternating current that induces of current transformer d, this alternating current is undertaken becoming the primary coil that direct current enters into quick-fried some Pulse induction device h after rectification and the filtering by the flat ripple device of normal state current e, the secondary direct impulse g of the inductor of quick-fried some Pulse induction device h is after pulse obstruction device j screens by a narrow margin, permission arrives the input of transient pulse and gate open road k greater than the electric current of pulse obstruction device threshold value by a narrow margin, the secondary negative-going pulse f of the 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 is furnished with input capacitance owing to above-mentioned with a door input, therefore when arriving, a transient pulse (such as quick-fried some pulse) needs only the secondary direct impulse voltage of inductor greater than pulse obstruction device threshold voltage by a narrow margin, all be malleation with two inputs of door when then inductor negative-going pulse f arrives, transient pulse and gate open road k namely have output current; Because section up-to-date style anti-jamming circuit i begins the period (such as 1 second) to above-mentioned output current when cutting effect is arranged again; therefore just can make magnetic reed switch coil m get electric after above-mentioned output current only has 1 second; thereby make the n adhesive of magnetic reed switch contact; because two normally opened contacts in the magnetic reed switch are connected respectively phase line and the earth; in case the two adhesive; namely can make and be enough to make the phase current of switch for leakage protector b tripping operation to enter ground; therefore quick-fried type short circuit pulse electric current appears connecting in loaded line; and the continuous impulse period is during 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 that causes once in a while during for people's toggle switch and low current disturbs, and all can not and cut a up-to-date style anti-jamming circuit i by pulse obstruction device j by a narrow margin.
Fig. 2 is circuit working schematic diagram of the present invention.CH is earth leakage protective device among Fig. 1, K1, K2 is in conjunction with the air circuit switch that rises with earth leakage protective device, A represents the phase line of alternating current 220V power supply, wire led to load direction when arrow represented electricity consumption, B1 is current transformer, L1, L2 is respectively primary coil and the secondary coil of current transformer, 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 respectively the primary coil of quick-fried some Pulse induction device, secondary positive pulse coil and secondary negative pulse coil, D5, D6 just is, the detector diode of negative pulse coil, C2, C3 is two input capacitances of AND circuit Y1, resistance R 1, R2 forms by a narrow margin pulse obstruction device, in order to align the by a narrow margin threshold value of pulse obstruction device, R1 is adjustable resistance, R3 is current-limiting resistance, and R4 is input resistance, and C5 is charging capacitor; Diode D7, capacitor C 4, be in triode BG, monostable flipflop Z, time relay S, the reverser T of cut-off state and form with door Y2 and to cut a up-to-date style anti-jamming circuit at ordinary times; G is magnetic reed switch, and L6 is the 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 the circuit, there are 50 hertz of alternating currents to pass through among the elementary L1 of instrument transformer B1, secondary L2 namely has induced electromotive force, after induced current carries out full-wave rectification through diode D1, D2, D3, D4, carry out filtering through capacitor C 1 again, thereby, load in circuit is steady, electric current is in when stablizing, two ends of capacitor C 1 are constant dc voltage values, be that coil L3 two ends do not have fluctuation voltage, thus the secondary positive pulse coil L4 of quick-fried some Pulse induction device B2 at ordinary times, and the upper influence electricity kinetic potential of secondary negative pulse coil L5.And when circuit was short-circuited, if the heavy in section short circuit, then electric current substantially exceeded rated current, the air circuit switch motion, and K1, K2 disconnect, dump.If daily electrical equipment appearance is the transient pulse electric current, then the upper electromotive force of L4, L5 is less, electric current will be by resistance R 1, R2 shunting, voltage between two resistance has not reached and has made diode D6 conducting voltage (threshold value), can not get electric with the input of door Y1, namely can not open with door Y1, then also can not open with door Y2, magnetic reed switch can not be worked.If quick-fried type short circuit occurs to connect, 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 by resistance R 1, R2 shunting, but the voltage between two resistance still can arrive the threshold voltage that makes diode current flow, get electric with the right input of door Y1, and by capacitor C 3 voltage is kept an instantaneous value, between this instantaneous value, because the short circuit electric wire is instantaneous to be blown, a reverse positive voltage occurs and make on the L5, this voltage acts on left input with door Y1 through D5, and Y1 is open-minded with door.In order to prevent that occasional in the circuit from occurring because the instantaneous disturbance that produces during people's toggle switch, therefore also establishing one section up-to-date style anti-jamming circuit with output the right of door Y1, its operation principle is: when first pulse begins, with malleation of door Y1 output, this positive current voltage a road through resistance R 3 to electric capacity 5 charging, charging makes and gets the positive electricity time with door Y2 left side input instantaneous delaying arranged, meanwhile charge to capacitor C 4 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 by original malleation, R5 is the earth resistance of reverser, capacitor namely is full of electricity after 1 second, reverser T input is namely replied negative pressure, the reverser output pressure of namely also reforming, reverser T output is the said preignition period in front for negative time span, in this preignition period since with the right input of door Y2 for negative, therefore not output of Y2, thus realize rejecting the purpose of disturbing signal with cutting up-to-date style; After the pulse in the preignition period is with capacitor C 4 full charges; Y2 the right trigger end keeps malleation; at this moment if connect quick-fried type short circuit; then certainly will have the output that quick-fried outer pulse of preignition period appears at Y1; but pulse at this moment no longer plays charging effect (because at this moment electric capacity is sufficient) to capacitor C 4; so Y2 the right trigger end keeps malleation constant; as long as so there be quick-fried outer pulse of preignition period to occur; two inputs of Y2 all are malleation namely; Y2 namely has output current, and coil L6 namely gets electric, the two contact K3 of magnetic reed switch G; the K4 adhesive; phase current is through resistance R 5 ground connection; because set electrical leakage and electric leakage time is all greater than the tripping operation index of earth leakage protective device CH, so earth leakage protective device will make load power source disconnect, and connect so quick-fried type short circuit in the wire and just begin; power supply just disconnects, and therefore electric baked wheaten cake can not form.Just when above-mentioned reverser T output is negative pressure, time relay S be triggered (this relay be negative trigger), time relay S backward monostable flipflop Z output in several seconds trigger current of delaying time, make monostable flipflop Z upset, Z namely exports positive electricity, with originally obstructed triode BG conducting, within several seconds of monostable flipflop Z upset, capacitor C 4 and C5 will discharge, and at this moment cut the 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 that a primary coil is serially connected in the current transformer on the electricity consumption line load; the induced current that the secondary coil of current transformer obtains is after the flat ripple device rectification of normality electric current and filtering; enter into the primary coil of quick-fried some pulse induction transformer; secondary direct impulse coil and the negative-going pulse coil of being provided with of quick-fried some pulse induction transformer; direct impulse coil and negative-going pulse coil access respectively two inputs on transient pulse and gate open road; also be connected in series by a narrow margin pulse obstruction device in the direct impulse coil; the output on transient pulse and gate open road is controlled magnetic reed switch after cutting the 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: quick-fried point produces the feature of instantaneous positive negative pulse stuffing ripple electric current when utilizing short circuit; realization is to the extraction of quick-fried some signal, and in conjunction with earth leakage protective device short circuit burnt and to control.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201912A (en) * | 2014-08-15 | 2014-12-10 | 京东方科技集团股份有限公司 | Alternating current-direct current (AC-DC) converter, 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 |
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| 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 |
| US20080055799A1 (en) * | 2006-08-31 | 2008-03-06 | Yazaki Corporation | Apparatus and method for detecting abnormal conditions of a motor |
| CN202217877U (en) * | 2011-04-29 | 2012-05-09 | 吴敏 | Multifunctional timing energy-saving security power socket |
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| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104201912A (en) * | 2014-08-15 | 2014-12-10 | 京东方科技集团股份有限公司 | Alternating current-direct current (AC-DC) converter, power panel and display device |
| 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 |
| US10026372B2 (en) | 2014-08-15 | 2018-07-17 | Boe Technology Group Co., Ltd. | Alternating current-direct current converter, power supply board and display apparatus |
| 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 |
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| CN103354344B (en) | 2015-11-25 |
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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 |