CN101226217B - Instrument for detecting breaking characteristic of current limiting fuse - Google Patents

Instrument for detecting breaking characteristic of current limiting fuse Download PDF

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Publication number
CN101226217B
CN101226217B CN2007100365621A CN200710036562A CN101226217B CN 101226217 B CN101226217 B CN 101226217B CN 2007100365621 A CN2007100365621 A CN 2007100365621A CN 200710036562 A CN200710036562 A CN 200710036562A CN 101226217 B CN101226217 B CN 101226217B
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button
relay
circuit
connects
timer
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CN101226217A (en
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孔利明
涂智仁
程俊峰
李林
石磊
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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Abstract

The invention discloses a breaking character detector of current limiting fuse, which comprises a main power supply, a current meter, a timer, an auxiliary power supply, a surge current generator, a heat engine buffer circuit, a current gate circuit and a fuse breaking locking signal extracting circuit, wherein the surge current generator is connected with the main power supply, the main power supply is connected with the current meter to be connected with the heat engine buffer circuit, the heat engine buffer circuit is connected with the current gate circuit mounted with a detector for detecting the fuse, the detector via the fuse breaking locking signal extracting circuit is connected with the current meter and the timer, the heat engine buffer circuit is connected with a preset trigger button to be controlled, the current gate circuit is connected with a synchronous trigger button to be controlled, the synchronous trigger button is connected with the timer, the auxiliary power supply is connected with the timer, a hand-operated return switch is connected with the timer and the current meter. The invention has simple operation, which can detect the breaking character of general current limiting fuse and can be added with a plug interface to detect other fuses of different types.

Description

Instrument for detecting breaking characteristic of current limiting fuse
(1) technical field
The present invention relates to detect the instrument of fuse technical feature, relate in particular to the breaking characteristics pick-up unit of limiting fuse.
(2) background technology
The electrical fire major part is caused in order to prevent circuit overloads, all the antioverloading safeguard measure must be arranged by standard design by circuit overload.Automatic overload switch, fuse etc. are arranged usually, and modal is exactly fuse.Fuse is being undertaken the safety of electrical equipment and electric equipment operation, and it has wide range of applications, but because fuse simple paid attention to by the people seldom.Produce the randomness of installing in violation of rules and regulations, not adorning thus, caused the electrical fire accident continuous.
Country is for the existing standard of the evaluation of fuse, but the method for identifying is very complicated, and its every performance index are formulated according to laboratory condition and acceptance specification.Must analyze the fuse-link starting material of fuse, technological process etc. is investigated, the time is longer, and spent cost is also higher.If by GB, each model fuse will be made a standard in per 2 years and identify that general producer does not accomplish.
Fuse branch exceed warm fuse, limiting fuse, pressure limiting fuse, high-speed fuse, delay-action fuse etc.The technical standard of fuse has more than ten more than.Authoritative test and the certifying agency of many families arranged in the world, test UL authentication, the MTTI authentication of the CSA authentication of Canadian Standards Association, Japan internationality and the trade Ministry of Industry and the ICE authentication of International Electrotechnical Commission (I.E.C.) of company as the underwriter of the U.S..
Fuse is most widely used general with " limiting fuse ", limiting fuse has 14 general the key technical indexes, but its major technology index is the fuse breaking characteristics, the fuse breaking characteristics can reduce three big indexs, i.e. fuse breaking current, fuse break, the time-delay of fuse antisurge.The fuse-link starting material that existing limiting fuse detects just fuse carry out check and analysis, and technological process etc. is investigated, neither one more comprehensively, the pick-up unit of the fuse interrupting performance of processing ease.
(3) summary of the invention
The object of the present invention is to provide a kind of instrument for detecting breaking characteristic of current limiting fuse, this detector can detect the breaking characteristics of limiting fuse, and easy to operate, applicability is strong.
The present invention is achieved in that a kind of instrument for detecting breaking characteristic of current limiting fuse, it is characterized in that: comprise primary power, reometer, timer, accessory power supply, surge current generator, hot machine buffer circuit, electric current gate circuit, fuse disjunction locking signal extraction circuit, preset trigger button, synchronous triggering button, manual reset switch; The surge current generator connects primary power, primary power connects reometer and connects hot machine buffer circuit again, hot machine buffer circuit connects the electric current gate circuit, the detection head that detects fuse is housed on the electric current gate circuit, detection head extracts circuit through fuse disjunction locking signal and connects reometer and timer, hot machine buffer circuit connects and presets trigger button and controlled by it, the electric current gate circuit connects the synchronous triggering button and controlled by it, the synchronous triggering button connects timer, accessory power supply connects timer, and manual reset switch connects timer and reometer.
Described primary power DY is constant voltage, electric current rearrangeable switch power supply; Internal current regulator potentiometer two ends WT leading-out wire serial connection three adjustable potentiometer W1, W2 of primary power DY, W3, potentiometer W1 two ends are parallel to button AN1, and three adjustable potentiometer W1, W2, W3 and button AN1 form the surge current generator;
The output terminal of primary power DY is a dc power output end, and the direct current output cathode connects controllable silicon CR1 positive pole through shunt FX, shunt FX two termination reometer A both positive and negative polarities, and reometer A is powered by stabilized voltage supply DA;
Hot machine buffer circuit comprises controllable silicon CR1, capacitor C 1, trigger button AN2, resistance R 1, tap switch FK, three thermistor PTC1-3, controllable silicon CR1 two termination capacitor C 1, controllable silicon trigger end G serial connection trigger button AN2 and resistance R 1 are to controllable silicon CR1 positive pole, tap switch FK is corresponding to three thermistor PTC1-3, connect controllable silicon CR1 negative pole after the parallel connection of three thermistor other ends, another termination primary power of tap switch FK DY direct current output negative pole; Trigger button AN2 is for presetting trigger button; Between controllable silicon CR1 negative pole and primary power DY direct current output negative pole, be connected in series LED 1 and resistance R 2;
The electric current gate circuit comprises that duplex often opens button AN3, controllable silicon CR2, current-limiting resistance R3, controllable silicon CR2 positive pole connects controllable silicon CR1 negative pole, controllable silicon trigger electrode G series resistor R3 and duplex are often opened one of button AN3 and are coupled to controllable silicon CR1 positive pole, controllable silicon CR2 negative pole is as the detection head positive pole, with primary power DY direct current output negative pole, be the detection head negative pole, form the detector test side;
It is the synchronous triggering button that duplex is often opened button AN3;
Fuse disjunction locking signal is extracted circuit and is comprised process timing circuit and current value lock-in circuit;
Second group of contact J1K-2 that the process timing circuit is often opened another connection of button AN3, diode D1, D2, D4, D5, resistance R 4, R5, controllable silicon CR3, relay J 1, relay J 1 by timer H, accessory power supply DE, duplex forms, accessory power supply DE positive pole connects duplex and often opens another connection of button AN3, and serial connection isolating diode D1 and resistance R 4, R5 divide crimping controllable silicon CR3 trigger electrode G to the detection head negative pole between resistance R 4, R5; Accessory power supply DE positive pole connects the normally closed contact of another duplex button AN4, through controllable silicon CR3 to relay J 1, the self-induced e.m.f that relay J 1 another termination detection head positive pole, relay J 1 two ends are succeeded electrical equipment J1 interior loop discharges diode D2, and accessory power supply DE negative pole connects the detection head negative pole; Timer H output terminal has four, be respectively keyed end Z, timing starting end K, reset to reset and hold F, control loop always to hold O, the K end is connected to accessory power supply DE positive pole through isolating diode D4, the Z end is connected to 1 second group of contact J1K-2 intermediate ends of relay J through isolating diode D5, the F end connects the normally opened contact end of duplex button AN4, another termination timer of the normally opened contact of duplex button AN4 O end, O terminating diode D1 positive pole, 1 second group of contact J1K-2 normally closed contact of relay J connect timer O end;
The current value lock-in circuit comprises reometer A, first group of contact J1K-1 of relay J 1, relay J 2, the normally opened contact J2K-1 of relay J 2, diode D3, capacitor C 2, LED 2, resistance R 6, first group of contact J1K-1 normally closed contact of relay J 1 connects controllable silicon CR3 negative pole, relay termination J2 one end in the middle of first group of contact J1K-1 of relay J 1, relay J 2 another termination detection head negative poles, at relay J 2 two ends respectively and succeed electrical equipment J2 interior loop self-induced e.m.f and discharge diode D3, buffer capacitor C2 is connected in parallel on relay J 2 two ends behind the LED 2 resistance in series R6; Normally opened contact J2K-1 one end of relay J 2 and intermediate ends connect reometer A keyed end SD two ends respectively;
Switching Power Supply DY, stabilized voltage supply DA, accessory power supply DE, timer also connect AC power; The hand-reset button is duplex button AN4.
It is the primary power that fuse detects that the present invention adopts the Switching Power Supply of constant-pressure flow regulating, has solved to detect the required big current requirements of fuse; Outside primary power, insert the surge current generator, can detect surge current; Adopt two chain hot machine buffer circuit and electric current gate circuits done of high-power silicon controlled rectifier,, make whole unit work coordination stable, adjust accurately reliable with the buffer protection primary power.Testing result shows: with regard to the time synchronisation reading the clock, reometer shows current value simultaneously from fuse test beginning; By open circuit signaling triggering timing device value locking time of fuse, the lock current table shows instant flow value simultaneously when fuse is fused; The present invention when test rated current amount and the stipulated time do not fuse also has overtime holding circuit when fuse of poor quality, can realize closing automatically primary power and send chimes of doom.
The present invention can detect the breaking characteristics of limiting fuse, and easy to operate, applicability is strong, and the fuse that can be fit to various models and different size detects.
(4) description of drawings
The invention will be further described below in conjunction with the drawings and specific embodiments.
Fig. 1 is an instrument for detecting breaking characteristic of current limiting fuse electrical diagram of the present invention;
Fig. 2 is an instrument for detecting breaking characteristic of current limiting fuse circuit diagram of the present invention;
Fig. 3 is pierce circuit figure;
Fig. 4 is the Antisurge current performance plot;
Fig. 5 is the posistor characteristic pattern;
Fig. 6 is an instrument for detecting breaking characteristic of current limiting fuse outward appearance front view (FV);
Fig. 7 is a detector outboard profile of opening the turnover panel test platform.
Among the figure: 1 primary power (Switching Power Supply), 2 current limit circuits, 3 pierce circuits; the manual control of 4 surge trigger circuit, the metering of 5 electric currents, 6 hot machine buffer circuits; 7 electric current gate circuits, 8 fuses, 9 preset trigger button; 10 synchronous triggering buttons, 11 accessory power supplys, 12 timers; 13 fuse disjunction locking signals are extracted circuit; 14 reometers, 15 manual reset switches, 16 overtime holding circuits.20 power switches, 21 reometers, 22 reset button, 23 timers, the test of 24 surge currents, 25 external calibrating terminals, 26 cabinets left side, 27 buffering selector switch, 28 electric current coarse adjustment, 29 electric current fine tunings, 30 preset trigger button, 31 synchronous triggering buttons, 32 surge currents are regulated, but 33 turnover panel test platforms, the 34 fixing magnet of turnover panel test platform, all kinds of fuse sockets parts of 35 test usefulness.
(5) embodiment
Referring to Fig. 1; a kind of instrument for detecting breaking characteristic of current limiting fuse comprises primary power 1, reometer 14, timer 12, accessory power supply 11, surge current generator, hot machine buffer circuit 6, electric current gate circuit 7, fuse disjunction locking signal extraction circuit 13, presets trigger button 9, synchronous triggering button 10, manual reset switch 15, overtime holding circuit 16.The surge current generator connects primary power 1, and primary power 1 connects electric current metering 5 and connects hot machine buffer circuit 6 again, and hot machine buffer circuit 6 connects electric current gate circuit 7, and the detection head that detects fuse 8 is housed on electric current gate circuit 7.The surge current generator comprises current limit circuit 2 and surge trigger circuit, and the surge trigger circuit comprise manual control button 4 and pierce circuit 3; Electric current metering 5 can show by reometer 14; Hot machine buffer circuit 6 connects and presets trigger button 9 and controlled by it, and electric current gate circuit 7 connects synchronous triggering button 10 and controlled by it.Detection head extracts circuit 13 through fuse disjunction locking signal and connects reometer 14 and timer 12, and fuse disjunction locking signal is extracted circuit 13 and comprised process timing circuit and current value lock-in circuit; Synchronous triggering button 10 connects timer 12, and accessory power supply 11 connects timer 12, and manual reset switch 15 connects timer 12 and reometer 14, and overtime holding circuit 16 connects timer 12 output terminals, connects primary power 1 input end.
Referring to Fig. 2, a kind of primary power DY of instrument for detecting breaking characteristic of current limiting fuse is constant voltage, electric current rearrangeable switch power supply; Internal current regulator potentiometer two ends WT leading-out wire serial connection three adjustable potentiometer W1, W2 of primary power DY, W3, potentiometer W1 two ends are parallel to button AN1, and three adjustable potentiometer W1, W2, W3 and button AN1 form the surge current generator.Wherein adjustable potentiometer W2, W3 are respectively magnitude of current coarse adjustment and fine tuning, i.e. current limit circuit; Because AN1 is normally closed button, equivalence is with adjustable potentiometer W1 short circuit.Principle of work according to current regulator in the Switching Power Supply; The big more output current of resistance is big more, and the more little output current of resistance is more little.The resistance value of adjustable potentiometer W1 is just as in the whole serial connection loop of having added up suddenly when pressing AN1, equivalence is regulated resistance and is increased suddenly, this moment, the electric current output amplitude of Switching Power Supply DY power supply also can strengthen suddenly, surge current is promptly arranged, and the amplitude of surge current is regulated by presetting of adjustable potentiometer W1 to be influenced; The big more surge current of W1 resistance is big more, otherwise just little.The time of surge current is relevant with the time that button AN1 presses, and is referred to as " manually " control 4.
In order to detect some high-accuracy fuses, increased pierce circuit 3 in the surge current generator, promptly surge current triggers with " oscillator ".Referring to Fig. 3, pierce circuit 3 is by the IC555 integrated package, resistance LR1, LR2, adjustable potentiometer LRW, electric capacity LC, diode LD, and driving triode LBG, relay J, relay normally open contact JK, button LN forms, 4 of integrated package, 8 pin join and connect button LD one end, the button LD other end connects the anodal L+ of lead-in wire, at integrated package 7, series resistor LR1 between 4 pin, integrated package 7, serial connection adjustable potentiometer LRW between 6 pin, integrated package 6,2 pin join, integrated package 6, serial connection electric capacity LC between 1 pin, the base stage of integrated package 3 pin series resistor LR2 and triode LBG, the emitter of triode LBG connects integrated package 1 pin and is connected lead-in wire negative pole L-, be connected on integrated package 8 pin and triode LBG collector after diode LD and the relay J parallel connection, relay normally open contact JK two ends are for connecting lead-in wire LK end.When the connection of pierce circuit 3 lead-in wire LK termination is inserted adjustable potentiometer W1 two ends, go between anodal L+ and negative pole L-of the connection of pierce circuit 3 patches positive pole and the negative pole of accessory power supply DE, referring to Fig. 3, Fig. 2; After this press the button AN1 and LN simultaneously, primary power DY will export equivalent pulse surge current continuously, and given instantaneous increment on the rated current basis of fuse standard is to measure " the Antisurge current characteristic " of every type of fuse, referring to Fig. 4.Pulsed frequency can be regulated by the adjustable potentiometer LRW among Fig. 3.
Referring to Fig. 2, the output terminal of primary power DY is a dc power output end, and the direct current output cathode connects controllable silicon CR1 positive pole through shunt FX, shunt FX two termination reometer A both positive and negative polarities, and reometer A is powered by stabilized voltage supply DA; The SD end of reometer A is the video data keyed end.This piece is electric current metering 5.
Need the bigger magnitude of current owing to detect fuse 8, the primary power 1 of detector can be operated in the state of sudden load change, and primary power 1 needs often to accept " test ", is protection primary power 1, and the present invention has incorporated hot machine buffer circuit 6 in circuit.Hot machine buffer circuit 6 comprises controllable silicon CR1, silicon controlled rectifier protecting buffer capacitor C1, controllable silicon trigger end G and trigger button AN2, triggers current-limiting resistance R1, tap switch FK, three thermistor PTC1-3.Three thermistor PTC1-3 have different current cut-off amounts, possess the macromolecular positive temperature coefficient thermosensitive resistor (PPTC) of auto-reset function.Controllable silicon CR1 two termination capacitor C 1, controllable silicon trigger end G serial connection trigger button AN2 and resistance R 1 are to controllable silicon CR1 positive pole, tap switch FK is corresponding to three thermistor PTC1-3, connect controllable silicon CR1 negative pole after the parallel connection of three thermistor other ends, another termination primary power of tap switch FK DY direct current output negative pole.Trigger button AN2 is for presetting trigger button; Between controllable silicon CR1 negative pole and primary power DY direct current output negative pole, be connected in series LED 1 and resistance R 2.After will adjusting what a agreement electric current gear with the electric current coarse adjustment potentiometer W2 of scale, the controllable silicon CR1 conducting that is triggered when pressing AN2 again and presetting trigger button 9, electric current constitutes the loop through the PTC (between the 1-3) of chosen some specifications through tap switch FK.Because without any load, reometer A data presented should be the quantitative approximately maximum of coarse adjustment in the loop.Can utilize fine tuning potentiometer W3 to do the precision adjustment this moment, to guarantee determined fuse correctness.Because the feature of PTC posistor, referring to Fig. 5, temperature rises rapidly under the effect of big electric current, and its resistance also increases rapidly when rising to certain value, and electric current descends rapidly, can reduce to almost blocking-up, and has only and keep electric current on a small quantity and pass through.Have only the controllable silicon CR1 of working as to be cut off, when electric current was zero, PTC is cooling recovery conducting normality rapidly.When LED 1 was lighted, " hot machine buffering " process was promptly accused and is finished.
Electric current gate circuit 7 comprises that duplex often opens button AN3, controllable silicon CR2, current-limiting resistance R3, controllable silicon CR2 positive pole connects controllable silicon CR1 negative pole, controllable silicon trigger electrode G series resistor R3 and duplex are often opened one of button AN3 and are coupled to controllable silicon CR1 positive pole, controllable silicon CR2 negative pole is as the detection head positive pole, with primary power DY direct current output negative pole, be the detection head negative pole, form the detector test side.Detected fuse RD is placed in the detection head both positive and negative polarity.
It is synchronous triggering button 10 that duplex is often opened button AN3, when duplex is often opened button AN3 and is pressed, and the controllable silicon CR2 conducting that is triggered, the setting measuring current of primary power DY has just flowed to detected fuse RD.
Fuse disjunction locking signal is extracted circuit 13 and is comprised process timing circuit and current value lock-in circuit, referring to Fig. 2.
Second group of contact J1K-2 that the process timing circuit is often opened another connection of button AN3, diode D1, D2, D4, D5, resistance R 4, R5, controllable silicon CR3, relay J 1, relay J 1 by timer H, accessory power supply DE, duplex forms, accessory power supply DE positive pole connects duplex and often opens another connection of button AN3, and serial connection isolating diode D1 and resistance R 4, R5 divide crimping controllable silicon CR3 trigger electrode G to the detection head negative pole between resistance R 4, R5; Accessory power supply DE positive pole connects the normally closed contact of another duplex button AN4, through controllable silicon CR3 to relay J 1, the self-induced e.m.f that relay J 1 another termination detection head positive pole, relay J 1 two ends are succeeded electrical equipment J1 interior loop discharges diode D2, and accessory power supply DE negative pole connects the detection head negative pole; The timer model is DHC48, timer H output terminal has four, be respectively keyed end Z, timing starting end K, reset to reset and hold F, control loop (electronegative potential) always to hold O, the K end is connected to accessory power supply DE positive pole through isolating diode D4, the Z end is connected to 1 second group of contact J1K-2 intermediate ends of relay J through isolating diode D5, the F end connects the normally opened contact end of duplex button AN4, another termination timer of the normally opened contact of duplex button AN4 O end, O terminating diode D1 positive pole, 1 second group of contact J1K-2 normally closed contact of relay J connect timer O end.
Its steering logic is: after pressing duplex and often opening button AN3, the positive pole of accessory power supply DE is by diode D1, resistance R 4, by the trigger electrode G that triggers controllable silicon CR3 after resistance R 5 dividing potential drops, controllable silicon CR3 conducting.The anodal normally closed contact of accessory power supply DE through another duplex button AN4, through controllable silicon CR3 to relay J 1, constitute the loop through tested fuse RD to the negative pole of accessory power supply DE again.After relay J 1 action two groups of contact J1K-1, J1K-2 of J1 are disconnected.Because pressing the button the J1K-2 of relay J1 behind the AN3 disconnects, timer H locking is released, the O that the K end Control current of while timer H is often driven button AN3-timer through diode D4-duplex holds the timing control loop that constitutes " commencing signal ", and timer H picks up counting and shows detection " process time " this moment.
The current value lock-in circuit comprises reometer A, first group of contact J1K-1 of relay J 1, relay J 2, the normally opened contact J2K-1 of relay J 2, diode D3, capacitor C 2, LED 2, resistance R 6, first group of contact J1K-1 normally closed contact of relay J 1 connects controllable silicon CR3 negative pole, relay termination J2 one end in the middle of first group of contact J1K-1 of relay J 1, relay J 2 another termination detection head negative poles, at relay J 2 two ends respectively and succeed electrical equipment J2 interior loop self-induced e.m.f and discharge diode D3, buffer capacitor C2 is connected in parallel on relay J 2 two ends behind the LED 2 resistance in series R6; Normally opened contact J2K-1 one end of relay J 2 and intermediate ends connect reometer A keyed end SD two ends respectively.
Switching Power Supply DY, stabilized voltage supply DA, accessory power supply DE, timer H also connect AC power, and AC power is 220V.The hand-reset button is duplex button AN4.
Described detector also comprises overtime holding circuit 16, and overtime holding circuit 16 comprises one group of normally closed contact HK1 in the timer H, and the interior one group of normally closed contact HK1 of timer H is serially connected in the end AC power inlet wire of primary power DY, reometer power supply DA.
Described detector also comprises the buzzing circuit, and another group normally opened contact HK2 of timer H is connected in series into hummer FM and relay J 1, and buzzer FM one termination is gone into the detection head positive pole.
During detection,, set when doing to detect and in official hour, fuse by presetting when the fuse RD of standard quality is placed in the detection head of detector.If tested fuse RD fuses in official hour, disjunction locking signal circuit 13 extraction logics of fuse are: fuse RD disconnects, relay J 1 loop of accessory power supply DE negative pole is disconnected, relay J 1 dead electricity, the closed again conducting of relay contact J1K-2 produces " end signal ", the Z of timer H end and O end constitute the loop, and timer instant playback value is locked, demonstration be exactly tested fuse RD fusing " finally accumulated time value " (example: 8.03S, 3.56S etc.).
Meanwhile, because reometer A is at testing process " the demonstration magnitude of current ", electric current finishes to be zero and shows, so that its final displayed value also must lock is controlled.Its steering logic is: when the fuse RD of standard quality is placed in the detection head of detector, after being fused when presetting the detection of setting do by the magnitude of current, the anodal normally closed contact of accessory power supply DE through another duplex button AN4, through controllable silicon CR3, pass through the J1K-1 normally closed contact of relay J 1 more again; Because this moment, relay J 1 loop was disconnected because of fuse RD fusing, relay J 1 dead electricity returns to normal; Make relay J 2 get electric and accessory power supply DE negative pole formation loop.The normally opened contact J2K-1 of relay J 2 is closed conducting simultaneously, and keyed end SD two ends of reometer A are switched on, and it is locked to have realized that the electric current instantaneous value shows.It is locked that LED 2 in the detector is lighted explanation reometer A.That the locking back shows is tested fuse RD " final blow-out current value " (example: 10.00A, 15.00A, 60.50A etc.).
Universal digital electronic ammeter does not generally have " locking " terminal, and what the present invention adopted is XL5135 series type mathematics reometer.The integrated circuit of its general-purpose chip is ICL-7107CPL.It is exactly the SD terminal of reometer A of the present invention that the 37th and 40 pin of ICL-7107CPL are drawn, and is exactly " locking " with two pin closures, and disconnecting is exactly " release ".
When detected fuse RD belonged to off-gauge low-quality goods, the result that given standard setting is measured had two possibilities: the one, and capacity fuse is too little, just fuses early less than enough electric currents, belongs to off-capacity.The 2nd, the specification scale value of fuse does not conform to reality, and capacity is too big, given normalized current overtime is set limits and do not fuse, and belongs to capacity and exceeds standard.Overtime holding circuit 16 is arranged in the detector of the present invention, and setting-up time is overtime when detecting, and timer H internal relay overturns automatically, one group of normally closed contact HK1 is disconnected, thereby close primary power DY and reometer A, has avoided overtime work, has played protective effect.Hummer FM also is equipped with in the present invention.When timer H internal relay during because of overtime automatic upset, another group normally opened contact HK2 is closed connection, the anodal process of accessory power supply DE duplex button AN4 normally closed contact, controllable silicon CR3, normally opened contact HK2, buzzer FM, fuse RD of poor quality are to accessory power supply DE negative pole, hummer FM sends chimes of doom, means that detected fuse RD belongs to the low-quality goods that capacity exceeds standard.
When continuing to detect next fuse, detector of the present invention is resetted just can work on.Manual reset switch 15 of the present invention is work like this: press reset button AN4, normally opened contact is switched on, this moment, the reset terminal " F " of timer H resetted through " O " end formation loop of duplex button AN4 contact to timer H, and the numeral of its demonstration all was zero after timer resetted.Another synchronous group normally closed contact of duplex is disconnected when pressing duplex button AN4, controllable silicon CR3 is owing to anodal outage is cut off, by the whole dead electricity in feasible following loop, back, relay J 2 is because dead electricity makes the disconnection that resets of the normally opened contact of J2K-1, the keyed end SD of reometer A is by open circuit and release, and the reometer after the release has promptly recovered normality.
Detector of the present invention also can detect surge current.In the circuit of motor is arranged, often sometimes want frequent starting, motor starting current when starting is working current 2-7 times, but the time is very short, about in general about 0.5S.This has the feature of Antisurge current with regard to needing the fuse in this circuit.Antisurge current is measured the hand push button AN1 that can use in the detector of the present invention; Also can measure continuous surge characteristic, promptly press the button AN1 and LN simultaneously, continuous impulse increment on fuse rated current basis, to measure the Antisurge current characteristic of various dissimilar fuses, the surge pulsed frequency is regulated by the adjustable potentiometer LRW of Fig. 3, general per minute about 10 times, the amplitude of surge current is regulated by the adjustable potentiometer W1 of Fig. 2.
Instrument for detecting breaking characteristic of current limiting fuse of the present invention can be done compactly, as Fig. 6, shown in Figure 7, can measure fuse commonly used on built-in mensuration platform, breaking characteristics to fuse detect, and it is convenient and simple for operation, and the result shows clear, be easy to carry, can detect at the scene; Increase and also can detect after patching interface, can external connection give " air " overlond trip switch, recover fuse cutout etc. certainly and make overload detection at the fuse of other models and different size.

Claims (5)

1. an instrument for detecting breaking characteristic of current limiting fuse is characterized in that: comprise primary power, reometer, timer, accessory power supply, surge current generator, hot machine buffer circuit, electric current gate circuit, fuse disjunction locking signal extraction circuit, preset trigger button, synchronous triggering button, manual reset switch; The surge current generator connects primary power, primary power connects reometer and connects hot machine buffer circuit again, hot machine buffer circuit connects the electric current gate circuit, the detection head that detects fuse is housed on the electric current gate circuit, detection head extracts circuit through fuse disjunction locking signal and connects reometer and timer, hot machine buffer circuit connects and presets trigger button and controlled by it, the electric current gate circuit connects the synchronous triggering button and controlled by it, the synchronous triggering button connects timer, accessory power supply connects timer, and manual reset switch connects timer and reometer.
2. instrument for detecting breaking characteristic of current limiting fuse according to claim 1 is characterized in that: primary power DY is constant voltage, electric current rearrangeable switch power supply; Internal current regulator potentiometer two ends WT leading-out wire serial connection three adjustable potentiometer W1, W2 of primary power DY, W3, potentiometer W1 two ends are parallel to button AN1, and three adjustable potentiometer W1, W2, W3 and button AN1 form the surge current generator;
The output terminal of primary power DY is a dc power output end, and the direct current output cathode connects controllable silicon CR1 positive pole through shunt FX, shunt FX two termination reometer A both positive and negative polarities, and reometer A is powered by stabilized voltage supply DA;
Hot machine buffer circuit comprises controllable silicon CR1, capacitor C 1, trigger button AN2, resistance R 1, tap switch FK, three thermistor PTC1-3, controllable silicon CR1 two termination capacitor C 1, controllable silicon trigger end G serial connection trigger button AN2 and resistance R 1 are to controllable silicon CR1 positive pole, tap switch FK is corresponding to three thermistor PTC1-3, connect controllable silicon CR1 negative pole after the parallel connection of three thermistor other ends, another termination primary power of tap switch FK DY direct current output negative pole; Trigger button AN2 is for presetting trigger button; Between controllable silicon CR1 negative pole and primary power DY direct current output negative pole, be connected in series LED 1 and resistance R 2;
The electric current gate circuit comprises that duplex often opens button AN3, controllable silicon CR2, current-limiting resistance R3, controllable silicon CR2 positive pole connects controllable silicon CR1 negative pole, controllable silicon trigger electrode G series resistor R3 and duplex are often opened one of button AN3 and are coupled to controllable silicon CR1 positive pole, controllable silicon CR2 negative pole is as the detection head positive pole, with primary power DY direct current output negative pole, be the detection head negative pole, form the detector test side;
It is the synchronous triggering button that duplex is often opened button AN3;
Fuse disjunction locking signal is extracted circuit and is comprised process timing circuit and current value lock-in circuit;
Second group of contact J1K-2 that the process timing circuit is often opened another connection of button AN3, diode D1, D2, D4, D5, resistance R 4, R5, controllable silicon CR3, relay J 1, relay J 1 by timer H, accessory power supply DE, duplex forms, accessory power supply DE positive pole connects duplex and often opens another connection of button AN3, and serial connection isolating diode D1 and resistance R 4, R5 divide crimping controllable silicon CR3 trigger electrode G to the detection head negative pole between resistance R 4, R5; Accessory power supply DE positive pole connects the normally closed contact of another duplex button AN4, through controllable silicon CR3 to relay J 1, the self-induced e.m.f that relay J 1 another termination detection head positive pole, relay J 1 two ends are succeeded electrical equipment J1 interior loop discharges diode D2, and accessory power supply DE negative pole connects the detection head negative pole; Timer H output terminal has four, be respectively keyed end Z, timing starting end K, reset to reset and hold F, control loop always to hold O, the K end is connected to accessory power supply DE positive pole through isolating diode D4, the Z end is connected to 1 second group of contact J1K-2 intermediate ends of relay J through isolating diode D5, the F end connects the normally opened contact end of duplex button AN4, another termination timer of the normally opened contact of duplex button AN4 O end, O terminating diode D1 positive pole, 1 second group of contact J1K-2 normally closed contact of relay J connect timer O end;
The current value lock-in circuit comprises reometer A, first group of contact J1K-1 of relay J 1, relay J 2, the normally opened contact J2K-1 of relay J 2, diode D3, capacitor C 2, LED 2, resistance R 6, first group of contact J1K-1 normally closed contact of relay J 1 connects controllable silicon CR3 negative pole, relay termination J2 one end in the middle of first group of contact J1K-1 of relay J 1, relay J 2 another termination detection head negative poles, at relay J 2 two ends respectively and succeed electrical equipment J2 interior loop self-induced e.m.f and discharge diode D3, buffer capacitor C2 is connected in parallel on relay J 2 two ends behind the LED 2 resistance in series R6; Normally opened contact J2K-1 one end of relay J 2 and intermediate ends connect reometer A keyed end SD two ends respectively;
Switching Power Supply DY, stabilized voltage supply DA, accessory power supply DE, timer H also connect AC power; The hand-reset button is duplex button AN4.
3. instrument for detecting breaking characteristic of current limiting fuse according to claim 2, it is characterized in that: the surge current generator also comprises pierce circuit, pierce circuit is by integrated package, resistance LR1, LR2, adjustable potentiometer LRW, electric capacity LC, diode LD, and driving triode LBG, relay J, relay normally open contact JK, button LN forms, described integrated package is IC 555 integrated packages, 4 of integrated package, 8 pin join and connect button LD one end, the button LD other end connects the anodal L+ of lead-in wire, at integrated package 7, series resistor LR1 between 4 pin, integrated package 7, serial connection adjustable potentiometer LRW between 6 pin, integrated package 6,2 pin join, integrated package 6, serial connection electric capacity LC between 1 pin, the base stage of integrated package 3 pin series resistor LR2 and triode LBG, the emitter of triode LBG connects integrated package 1 pin and is connected lead-in wire negative pole L-, be connected on integrated package 8 pin and triode LBG collector after diode LD and the relay J parallel connection, relay normally open contact JK two ends are for connecting lead-in wire LK end, the connection of pierce circuit lead-in wire LK termination is gone into adjustable potentiometer W1 two ends, and go between anodal L+ and negative pole L-of the connection of pierce circuit inserts positive pole and the negative pole of accessory power supply DE.
4. instrument for detecting breaking characteristic of current limiting fuse according to claim 2; it is characterized in that: described detector also comprises overtime holding circuit; overtime holding circuit comprises one group of normally closed contact HK1 in the timer H, and the interior one group of normally closed contact HK1 of timer H is serially connected in the end AC power inlet wire of primary power DY, reometer power supply DA.
5. instrument for detecting breaking characteristic of current limiting fuse according to claim 2, it is characterized in that: described detector also comprises the buzzing circuit, another group normally opened contact HK2 of timer H is connected in series into hummer FM and relay J 1, and buzzer FM one termination is gone into the detection head positive pole.
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