CN1123962A - Automatic electronic air-switch - Google Patents
Automatic electronic air-switch Download PDFInfo
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- CN1123962A CN1123962A CN 94118377 CN94118377A CN1123962A CN 1123962 A CN1123962 A CN 1123962A CN 94118377 CN94118377 CN 94118377 CN 94118377 A CN94118377 A CN 94118377A CN 1123962 A CN1123962 A CN 1123962A
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- circuit
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- voltage
- current
- electronic air
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Abstract
The electronic air switch with the protection of serious three-phase unbalance caused by overload, phase-loss, and shortcircuit is composed of main switch, current sampler, voltage mutual inductor isolating circuit, active semi-wave rectifier-amplifier, three-phase average circuit, peak detector, current regulator, counter-timeout circuit, voltage comparator-amplifier, executing circuit for releasing, and mechanical releasing unit, and features its three-phase unbalance protector and non-overload discharger.
Description
The present invention relates to a kind of automatic electronic air-switch, be used for three-phase distribution and three-phase equipment overload, the phase failure, three-phase imbalance short circuit and other cause serious three-phase imbalance protection.
Automatic air-break switch (as DZ10-100) in the market, generally be to adopt the work of bimetallic thermal deformation, owing to being subjected to reasons such as mechanical fatigue, ambient temperature, usually when automatic air-break switch moves, motor strains or burns, and causes bigger economic loss.In addition, in mechanical type automatic air-break switch when work,, energy consumption is big, does not have functions such as open phase protection and current value be adjustable, is difficult to adapt to independent control motor occasion.Though also occur some electronic type automatic air-break switches on the market, current sampling partly adopts current transformer, volume is big, poor sensitivity, and the price height does not have the electrical characteristics and the thermal characteristics of complete simulating motor, and the restriction automatic electronic air-switch is promoted.
Aim of the present invention: the electronic circuit that provides the more satisfactory simulation electric electromechanics of a kind of energy characteristic and thermal characteristics is multi-functional with the formation that former automatic air-break switch machinery trip gear combines, high accuracy, the adjustable automatic electronic air-switch of current value.Present embodiment, the automatic air-break switch of selecting 50A in the DZ10-100 series for use is an example.
Fig. 1 is automatic electronic air-switch, alternating current motor Control work functional-block diagram.
Fig. 2 is an automatic electronic air-switch electronic circuit fundamental diagram.
By Fig. 1, Fig. 2; present embodiment is one and has overload, the phase failure, three-phase imbalance short circuit and other cause the electronic type automatic air-break switch of severe three-phase unbalance protection function, turn-offs executive circuit, mechanical trip gear etc. by three-phase main switch, alternating current motor, current sampling circuit, voltage transformer buffer circuit, active accurate halfwave rectifier amplifying circuit, three-phase average value filtering circuit, three-phase peak-detector circuit, current regulating circuit, inverse time lag circuit, voltage contrasting amplified circuit, tripping coil and partly form.Inverse time lag circuit two ends also connect a non-overload discharge circuit, and this circuit is by integrated voltage comparator N
4And output resistance R
9Form, the positive termination current regulating circuit of integrated voltage comparator potentiometer RP centre cap, negative terminal meets voltage contrasting amplified circuit voltage-stabiliser tube V
1Hot end, output is through R
9Connect inverse time lag circuit delay capacitor C
3Anode.The inverse time lag circuit is by voltage-stabiliser tube V
3And resistance R
11Series circuit and the resistance R formed
10In parallel, again with delay capacitor C
3Be in series and form.Experiment showed, as long as accurately calculate the anti-time limit characteristic of said elements bimetal leaf.The purpose of setting up non-overload discharge circuit is to pass through this circuit with delay capacitor C when the non-overload of motor
3Anode is clamped at zero potential, gives delay capacitor C
3Provide a discharge paths over the ground, with charge constant and discharge time constant simulating motor temperature rise and fall time constant, with capacitor C
3Last voltage analog motor temperature, when the motor operating current did not have overrate, the voltage on the electric capacity was always zero.
Existing automatic electronic air-switch overload protection is that the series-parallel circuit that utilizes voltage-stabiliser tube, resistance, electric capacity to form is formed, because the voltage-stabiliser tube electric leakage, and interference signal slowly rises capacitance voltage, causes misoperation.Do not provide an electric charge to discharge branch road to electric capacity, capacitance voltage is difficult to the simulating motor temperature rise.Therefore, at inverse time lag circuit two ends and to connect non-overload discharge circuit be key character of the technology of the present invention difference prior art.
Connect the three-phase imbalance protective circuit between three-phase average value filtering circuit, current regulating circuit, the voltage contrasting amplified circuit.This circuit is by integrated voltage comparator N
1, N
2, N
3Form, its anode meets three-phase average value filtering circuit capacitance C respectively
1Anode, negative terminal are connected on the current regulating circuit resistance R simultaneously
8Hot end, output termination voltage contrasting amplified circuit voltage-stabiliser tube V
1Hot end.The purpose that this circuit is set is serious uneven operating state (as short circuit between phase shortage, two alternate short circuits, phase and ground etc.) time to occur at motor to protect the simulating motor electrical characteristics.
As three-phase A, B, C is arbitrary when the phase failure occurring mutually, this phase average value filtering circuit capacitance C
1Last voltage drop is an electronegative potential, current regulating circuit R
8Hot end voltage depends on that the three-phase peak-detector circuit keeps capacitor C
2Voltage, so the positive terminal voltage of three-phase imbalance protective circuit integrated voltage comparator is lower than negative terminal voltage, output is by original high potential (voltage-stabiliser tube V
1The voltage stabilizing value) becomes in zero potential; The positive terminal voltage of voltage contrasting amplified circuit integrated operational amplifier is higher than negative terminal voltage, and its output is a high potential by original zero potential upset, through triode V
2And base resistance R
13Make this triode saturated rapidly, tripping coil gets electric, mechanical trip gear action, and the three-phase main switch cuts off the three-phase main power source immediately.
As three-phase A, B, C is arbitrary when shorted to earth occurring mutually, big electric current will cause this mutually active accurate halfwave rectifier amplifying circuit integrated operational amplifier output current potential sharply to rise and be saturated rapidly, the current regulating circuit resistance R
8The hot end current potential sharply rises, because detector diode buffer action, two-phase average value filtering circuit capacitance C in addition
1On voltage remain unchanged, by the current regulating circuit resistance R
7, R
8, potentiometer RP parameter designing, three-phase imbalance protective circuit integrated voltage comparator negative terminal voltage is higher than positive terminal voltage, the output of this two-phase integrated voltage comparator is by high potential (voltage-stabiliser tube V
1The voltage stabilizing value) overturn in zero potential, process voltage contrasting amplified circuit and tripping coil shutoff executive circuit are swift in motion mechanical trip gear and cut off the three-phase main power source.
If during two alternate short circuits; biphase current sharply increases; according to single-phase shorted to earth analysis; make another phase integrated voltage comparator output zero potential in the three-phase imbalance protective circuit equally, process voltage contrasting amplified circuit and tripping coil shutoff executive circuit are swift in motion mechanical trip gear and cut off the three-phase main power source.
If A, B, C occur serious uneven; as long as make three-phase imbalance protective circuit integrated voltage comparator negative terminal current potential be higher than positive terminal potential; its output zero potential can occur equally, makes mechanical trip gear action cut off the three-phase main power source through voltage contrasting amplified circuit and tripping coil shutoff executive circuit.
Because electronic type automatic air-break switch short-circuit protection designs according to actual current value and load current value ratio at present, therefore, must avoid the motor starting electric current, especially in control multiple motors occasion, situation is complicated more.The technical solution used in the present invention; be to utilize the uneven principle of three-phase order; as long as wherein one mutually or biphase current during greater than other two-phase or phase several times; the Electronic Protection circuit just plays a role; dexterously the phase failure, relative ground circuit, two alternate short circuits and other being produced serious three-phase imbalance state and be unified in a kind of circuit, is another key character of the technology of the present invention and prior art.
Current sampling adopts copper resistance RA, RB, RC as transducer.Copper resistance RA, RB, RC are connected on respectively in the motor main circuit, its two terminations voltage transformer TV
1, TV
2, TV
3Elementary, the minute-pressure on the copper resistance is fallen and can be reflected alternating current motor operating current size truly, air switch is operated in the low-grade fever state, energy-saving effect is dignitary particularly.The accurate halfwave rectifier amplifying circuit in the source that is connected between voltage transformer buffer circuit and three-phase peak-detector circuit, this circuit is by biasing resistor R
1, R
2, integrated operational amplifier T
1, T
2, T
3And output, negative terminal, biasing resistor R
1, R
2Meet the series resistance R between the connection point
3, R
4Form.The purpose that this circuit is set is carried out halfwave rectifier with the isolating transformer secondary voltage on the one hand, on the other hand this voltage high-fidelity is amplified, when even motor is operated in zero load, also can obtain bigger d. c. voltage signal at its output, obtain d. c. voltage signal with the current transformer of electronic type automatic air-break switch employing in the market and compare, have tangible advantage (distortion is little, amplitude is big).Biasing resistor R is set
1, R
2Purpose be automatic air-break switch when bringing onto load not, also can close a floodgate in the same old way, principle is three-phase average value filtering circuit capacitance C
1A fixing faint direct voltage is arranged, make three-phase imbalance protective circuit integrated voltage comparator output be in high potential all the time.Connect the three-phase peak-detector circuit between active accurate halfwave rectifier amplifying circuit and the current regulating circuit, the purpose that this circuit is set is to make in current regulating circuit potentiometer RP hot end voltage depend on maximum that phase crest voltage of the accurate halfwave rectifier amplifying circuit of three-phase active voltage magnitude.
Among Fig. 2 the automatic electronic air-switch current specification within the specific limits, by integrated operational amplifier T in the active accurate halfwave rectifier amplifying circuit
1, T
2, T
3Output, negative terminal and biasing resistor R
1, R
2Series resistance R between the tie point
3, R
4The ratio decision, need only change R for same specification current sampling transducer RA, RB, RC
3, R
4Ratio just can conveniently be produced the automatic electronic air-switch of different size, brings great convenience to production.
Inverse time lag circuit input end voltage signal size, depend on potentiometer RP centre cap position in the current regulating circuit, in a certain current range to the motor of different rated current, as long as change potentiometer RP centre cap position, just can obtain same output voltage signal, this voltage and motor power (output) are irrelevant, and be only relevant with the motor load multiple, reduced the automatic electronic air-switch current specification, brought great convenience for production and use.
In sum, this automatic electronic air-switch is compared with former automatic air-break switch, has the following advantages:
1, has the phase failure, three-phase imbalance short-circuit protection and other cause serious three-phase imbalance protection, widened the range of application of automatic electronic air-switch.
2, adopt integrated circuit, ambient temperature, the change in voltage influence is little, the accuracy height.
3, realize overload protection function with electronic component, precision height, low in energy consumption.
4, use same specification copper resistance, can produce and produce the automatic electronic air-switch of multiple different size easily, so this automatic electronic air-switch is a kind ofly can substitute the very strong electric equipment products of former automatic air-break switch practicality.
Claims (6)
1, a kind of automatic electronic air-switch; electronic circuit comprises current sampling circuit; the voltage transformer buffer circuit, active accurate halfwave rectifier amplifying circuit, three-phase average value filtering circuit; the three-phase peak-detector circuit; current regulating circuit, inverse time lag circuit, voltage contrasting amplified circuit; tripping coil turn-offs executive circuit, it is characterized in that this automatic electronic air-switch also comprises three-phase imbalance protective circuit and non-overload discharge circuit.The anode of three-phase imbalance protective circuit integrated voltage comparator, negative terminal, output are connected on three-phase average value filtering circuit capacitance (C respectively
1) anode, current regulating circuit resistance (R
8) hot end, voltage contrasting amplified circuit voltage-stabiliser tube (V
1) hot end; Non-overload discharge circuit is connected on current regulating circuit potentiometer (RP) centre cap and inverse time lag circuit delay electric capacity (C
3) between the anode.
2, according to claims 1 described automatic electronic air-switch, it is characterized in that current sampling circuit adopts copper resistance (RA, RB, RC), be connected in the inner three-phase main circuit of automatic air-break switch.
3,, it is characterized in that being connected between voltage transformer buffer circuit and the three-phase peak-detector circuit the accurate halfwave rectifier amplifying circuit in source, by biasing resistor (R according to claims 1 or 2 described automatic electronic air-switchs
1, R
2), integrated operational amplifier (T
1, T
2, T
3) and output, negative terminal, biasing resistor tie point between series resistance (R
3, R
4) form.
4, according to claims 1 or 2 or 3 described automatic electronic air-switchs, it is characterized in that connecing the three-phase peak-detector circuit between active accurate halfwave rectifier amplifying circuit and the current regulating circuit, its input is connected with active accurate halfwave rectifier amplification circuit output end by detector diode (VD), and output is by keeping electric capacity (C
2) be connected with current regulating circuit potentiometer (RP) hot end.
5, according to claims 1 or 2 or 3 or 4 described automatic electronic air-switchs, it is characterized in that connecing three-phase average value filtering circuit between active accurate halfwave rectifier amplifying circuit and the three-phase imbalance protective circuit, this circuit is by current-limiting resistance (R
5) and filter capacitor (C
1) be composed in series, current-limiting resistance (R
5) hot end is connected to the accurate halfwave rectifier amplification circuit output end in source, electronegative potential termination three-phase imbalance protective circuit integrated voltage comparator (N
1, N
2, N
3) anode.
6,, it is characterized in that the three-phase peak-detector circuit keeps electric capacity (C according to claims 1 or 2 or 3 or 4 described automatic electronic air-switchs
2) connecing current regulating circuit between anode and the inverse time lag circuit input end, this circuit is by potentiometer (RP), resistance (R
7, R
8) be composed in series, potentiometer high potential termination is kept electric capacity (C
2) anode, centre cap connects the inverse time lag circuit input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94118377A CN1047482C (en) | 1994-11-28 | 1994-11-28 | Automatic electronic air-switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94118377A CN1047482C (en) | 1994-11-28 | 1994-11-28 | Automatic electronic air-switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1123962A true CN1123962A (en) | 1996-06-05 |
| CN1047482C CN1047482C (en) | 1999-12-15 |
Family
ID=5038802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94118377A Expired - Fee Related CN1047482C (en) | 1994-11-28 | 1994-11-28 | Automatic electronic air-switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1047482C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401217A (en) * | 2013-08-07 | 2013-11-20 | 浙江纪元电力自动化科技有限公司 | Intelligent motor protector |
| CN113839604A (en) * | 2020-06-24 | 2021-12-24 | 依必安派特穆尔芬根有限两合公司 | Locked rotor identification |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2043432U (en) * | 1988-10-05 | 1989-08-23 | 衡阳湘南电机厂 | Multifunction switch of three-phase asynchronous motor |
| CN2043019U (en) * | 1988-10-31 | 1989-08-16 | 徐明显 | Protector for electric leakage |
| CN1063385A (en) * | 1991-01-19 | 1992-08-05 | 戴开煌 | Contactless multifunctional switch |
| CN2093470U (en) * | 1991-05-10 | 1992-01-15 | 石家庄市新星电子开关厂 | Multifunctional protection three-phase contactless electronic switch |
-
1994
- 1994-11-28 CN CN94118377A patent/CN1047482C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401217A (en) * | 2013-08-07 | 2013-11-20 | 浙江纪元电力自动化科技有限公司 | Intelligent motor protector |
| CN103401217B (en) * | 2013-08-07 | 2018-01-09 | 浙江纪元电气科技股份有限公司 | Intelligent motor protector |
| CN113839604A (en) * | 2020-06-24 | 2021-12-24 | 依必安派特穆尔芬根有限两合公司 | Locked rotor identification |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1047482C (en) | 1999-12-15 |
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| PB01 | Publication | ||
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |