CN102842894B - Motor open-phase protection device without auxiliary power supply - Google Patents
Motor open-phase protection device without auxiliary power supply Download PDFInfo
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- CN102842894B CN102842894B CN201210381697.2A CN201210381697A CN102842894B CN 102842894 B CN102842894 B CN 102842894B CN 201210381697 A CN201210381697 A CN 201210381697A CN 102842894 B CN102842894 B CN 102842894B
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Abstract
The invention provides a motor open-phase protection device without an auxiliary power supply. The motor open-phase protection device comprises a shell, a single-stage automatic switch, an electronic assembly board, three three-phase annular voltage transformers and an alternating-current contactor, wherein the single-stage automatic switch is arranged in the shell; the electronic assembly board is provided with a switch control circuit; the three three-phase annular voltage transformers are used for constructing a three-phase alternating-current voltage output circuit; the alternating-current contactor is used for executing motor circuit-breaking operation; and the electronic assembly board is used for operating the single-stage automatic switch to act after processing a voltage signal acquired by using the three-phase annular voltage transformers, so that the alternating-current contactor is driven to act for completing an open-phase protection function. Due to the arrangement of the switch control circuit, the power supply access way of the motor open-phase protection device is changed; and the motor open-phase protection device has the advantages of high reliability, easiness and convenience in wiring, long service life, economy and practicability.
Description
Technical field
The present invention relates to a kind of three-phase motor open-phase proterctive equipment, specifically, relate to a kind of without accessory power supply formula loss-of-phase protection arrangement.
Background technology
Phase failure protection for three-phase motor as a kind of low-voltage electrical apparatus proterctive equipment, be widely used in threephase motor be power circuit in.But; in the operation of reality uses; this electronic product need access accessory power supply; this can make portions of electronics element and components and parts often bear the voltage between lines of 380V; thus cause portions of electronics element and components and parts frequently to burn; the non-constant of reliability, cannot reach the object of open-phase protection in advance completely.
In order to solve above Problems existing, people are seeking a kind of desirable technical solution always.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, thus provide that a kind of reliability is strong, wiring is easy, long service life, economical and practical without accessory power supply formula loss-of-phase protection arrangement.
To achieve these goals, the technical solution adopted in the present invention is: a kind of without accessory power supply formula loss-of-phase protection arrangement, it comprises housing, the single-stage automatic switch be arranged in described housing, be provided with ON-OFF control circuit electric sub-member plate, three for the annular voltage transformer of three-phase that forms three-phase alternating current voltage follower circuit and the A.C. contactor for operating motor open-circuit operation;
Described single-stage automatic switch comprises switch pedestal and is separately positioned on single-stage automatic switch dynamic/static contact, single-stage automatic switch tripping mechanism, single-stage automatic switch tripping coil TQ and the single-stage automatic switch dynamic/static contact lead-out terminal in described switch pedestal, one end of described single-stage automatic switch tripping mechanism connects described single-stage automatic switch dynamic/static contact, and the other end of described single-stage automatic switch tripping mechanism connects described single-stage automatic switch tripping coil TQ;
The former limit winding of three described three-phase annular voltage transformers is all connected to the power end of threephase motor, the vice-side winding head end of three described three-phase annular voltage transformers is respectively as three-phase output end, the vice-side winding tail end of three described three-phase annular voltage transformers is interconnected, thus forms described three-phase alternating current voltage follower circuit;
Described ON-OFF control circuit comprises three-phase bridge rectification power work loop, gate voltage current rectifying and wave filtering circuit, three in-gate circuits, three input gates export delay circuit and executive circuit, and wherein, described three-phase bridge rectification power work loop comprises diode V1, diode V2, diode V3, diode V4, diode V5 and diode V6, described diode V1, described diode V2, the three-phase output end of described three-phase alternating current voltage follower circuit is connected to respectively with the positive pole of described diode V3, the positive pole of described diode V1 connects the negative pole of described diode V4, the positive pole of described diode V2 connects the negative pole of described diode V5, the positive pole of described diode V3 connects the negative pole of described diode V6, described diode V1, described diode V2, the output cathode as this three-phase bridge rectification power work loop is interconnected, described diode V4 with the negative pole of described diode V3, the positive pole of described diode V5 and described diode V6 is interconnected output negative pole as this three-phase bridge rectification power work loop and ground connection,
Described gate voltage current rectifying and wave filtering circuit comprises diode V7, diode V8, diode V9, resistor R1, resistor R2, resistor R3, electrolytic capacitor C1, electrolytic capacitor C2 and electrolytic capacitor C3, described diode V7, described diode V8, the positive pole of described diode V9 is connected to the three-phase output end of described three-phase alternating current voltage follower circuit respectively, described diode V7, described resistor R1 is connected to the positive terminal of described electrolytic capacitor C1 after being connected in series, described diode V8, described resistor R2 is connected to the positive terminal of described electrolytic capacitor C2 after being connected in series, described diode V9, described resistor R3 is connected to the positive terminal of described electrolytic capacitor C3 after being connected in series, described electrolytic capacitor C1, the equal ground connection of negative pole end of described electrolytic capacitor C2 and described electrolytic capacitor C3,
Described three in-gate circuits comprise triode V10, triode V11, triode V12 and resistor R4, the base stage of described triode V10 is connected to the positive terminal of described electrolytic capacitor C1, the base stage of described triode V11 is connected to the positive terminal of described electrolytic capacitor C2, the base stage of described triode V12 is connected to the positive terminal of described electrolytic capacitor C3, the collector electrode of described triode V10 is connected to one end of described resistor R4, the other end of described resistor R4 connects the output cathode in described three-phase bridge rectification power work loop, the emitter of described triode V10 connects the collector electrode of described triode V11, the emitter of triode V11 connects the collector electrode of described triode V12, the emitter of described triode V12 connects the output negative pole in described three-phase bridge rectification power work loop to ground connection,
Described three input gates export delay circuit and comprise resistor R5 and electrolytic capacitor C4, one end of described resistor R5 is connected to the collector electrode of described triode V10, the other end of described resistor R5 connects the positive pole of described electrolytic capacitor C4, and the negative pole of described capacitor C4 connects the output negative pole in described three-phase bridge rectification power work loop to ground connection;
Described executive circuit comprises thyristor VT1 and described single-stage automatic switch tripping coil TQ, the control pole of described thyristor VT1 connects the positive pole of described capacitor C4, the negative electrode of described thyristor VT1 connects the output negative pole in described three-phase bridge rectification power work loop to ground connection, single-stage automatic switch tripping coil TQ described in cross-over connection between the anode of described thyristor VT1 and the output cathode in described three-phase bridge rectification power work loop;
Described single-stage automatic switch dynamic/static contact lead-out terminal is connected between the coil CJ of described A.C. contactor, and the dynamic/static contact FQ of described A.C. contactor is serially connected in the three-phase alternating-current supply of motor respectively.
Hinge structure of the present invention has outstanding substantive distinguishing features and marked improvement; specifically; the present invention, by arranging ON-OFF control circuit, changes the plant-grid connection mode of loss-of-phase protection arrangement, has that reliability is strong, wiring is easy, long service life, economical and practical advantage.
Accompanying drawing explanation
Fig. 1 is surface structure schematic diagram of the present invention.
Fig. 2 is the structural representation of single-stage automatic switch.
Fig. 3 is circuit working principle schematic of the present invention.
Embodiment
Below by embodiment, technical scheme of the present invention is described in further detail.
As shown in Figure 1; a kind of without accessory power supply formula loss-of-phase protection arrangement; it comprises housing 1; operating grip 2; be arranged on the single-stage automatic switch in described housing 1; the electric sub-member plate 3, three being provided with ON-OFF control circuit, for forming three-phase annular voltage transformer PT1, PT2, PT3 of three-phase alternating current voltage follower circuit and the A.C. contactor for operating motor open-circuit operation, described housing 1 is provided with phase line through hole 4.
As shown in Figure 2, described single-stage automatic switch comprises switch pedestal 201 and is separately positioned on single-stage automatic switch dynamic/static contact 202, single-stage automatic switch tripping mechanism 203, single-stage automatic switch tripping coil TQ204 and the single-stage automatic switch dynamic/static contact lead-out terminal 205 in described switch pedestal 201, one end of described single-stage automatic switch tripping mechanism 203 connects described single-stage automatic switch dynamic/static contact 202, and the other end of described single-stage automatic switch tripping mechanism 203 connects described single-stage automatic switch tripping coil TQ204.
As shown in Figure 3, the former limit winding of three-phase annular voltage transformer PT1, PT2, PT3 is connected to the power end of threephase motor, the vice-side winding head end of three-phase annular voltage transformer PT1, PT2, PT3 is respectively as three-phase output end, the vice-side winding tail end of three-phase annular voltage transformer PT1, PT2, PT3 is then interconnected, and forms described three-phase alternating current voltage follower circuit.
Described ON-OFF control circuit comprises three-phase bridge rectification power work loop 301, gate voltage current rectifying and wave filtering circuit 302, three in-gate circuits 303, three input gates export delay circuit 304 and executive circuit 305, and wherein, described three-phase bridge rectification power work loop 301 comprises diode V1, diode V2, diode V3, diode V4, diode V5 and diode V6, described diode V1, described diode V2, the three-phase output end of described three-phase alternating current voltage follower circuit is connected to respectively as the input in described three-phase bridge rectification power work loop 301 with the positive pole of described diode V3, the positive pole of described diode V1 connects the negative pole of described diode V4, the positive pole of described diode V2 connects the negative pole of described diode V5, the positive pole of described diode V3 connects the negative pole of described diode V6, described diode V1, described diode V2, the output cathode as this three-phase bridge rectification power work loop 301 is interconnected, described diode V4 with the negative pole of described diode V3, described diode V5, output negative pole as this three-phase bridge rectification power work loop 301 is interconnected and ground connection with the positive pole of described diode V6,
Gate voltage current rectifying and wave filtering circuit 302 comprises diode V7, diode V8, diode V9, resistor R1, resistor R2, resistor R3, electrolytic capacitor C1, electrolytic capacitor C2 and electrolytic capacitor C3, described diode V7, described diode V8, the positive pole of described diode V9 is connected to the three-phase output end of described three-phase alternating current voltage follower circuit respectively, described diode V7, described resistor R1 is connected to the positive terminal of described electrolytic capacitor C1 after being connected in series, described diode V8, described resistor R2 is connected to the positive terminal of described electrolytic capacitor C2 after being connected in series, described diode V9, described resistor R3 is connected to the positive terminal of described electrolytic capacitor C3 after being connected in series, described electrolytic capacitor C1, the equal ground connection of negative pole end of described electrolytic capacitor C2 and described electrolytic capacitor C3,
Three in-gate circuits 303 comprise triode V10, triode V11, triode V12 and resistor R4, the base stage of described triode V10 is connected to the positive terminal of described electrolytic capacitor C1, the base stage of described triode V11 is connected to the positive terminal of described electrolytic capacitor C2, the base stage of described triode V12 is connected to the positive terminal of described electrolytic capacitor C3, the collector electrode of described triode V10 is connected to one end of described resistor R4, the other end of described resistor R4 connects the output cathode in described three-phase bridge rectification power work loop 301, the emitter of described triode V10 connects the collector electrode of described triode V11, the emitter of triode V11 connects the collector electrode of described triode V12, the emitter of described triode V12 connects the output negative pole in described three-phase bridge rectification power work loop 301 to ground connection,
Described three input gates export delay circuit 304 and comprise resistor R5 and electrolytic capacitor C4, one end of described resistor R5 is connected to the collector electrode of described triode V10, the other end of described resistor R5 connects the positive pole of described electrolytic capacitor C4, and the negative pole of described capacitor C4 connects the output negative pole in described three-phase bridge rectification power work loop 301 to ground connection;
Described executive circuit 305 comprises thyristor VT1 and single-stage automatic switch tripping coil TQ, the control pole of described thyristor VT1 connects the positive pole of described capacitor C4, the negative electrode of described thyristor VT1 connects the output negative pole in described three-phase bridge rectification power work loop 301 to ground connection, and between the anode of described thyristor VT1 and the output cathode in described three-phase bridge rectification power work loop 301, cross-over connection has described single-stage automatic switch tripping coil TQ;
Described single-stage automatic switch dynamic/static contact lead-out terminal 205 is connected between the coil CJ of described A.C. contactor, and the dynamic/static contact FQ of described A.C. contactor is serially connected in the three-phase alternating-current supply of motor respectively.
When this comes into operation without accessory power supply formula loss-of-phase protection arrangement, operate described operating grip 2 and described single-stage automatic switch 101 is closed, device normally runs.
The realization of default-phase protection function: under normal circumstances, three-phase line load loop current forms current circuit by three annular voltage transformer PT1, PT2, PT3, now, three-phase annular voltage transformer PT1, PT2, PT3 vice-side winding induced electromotive force (about 40 ~ 45V) and produce alternating voltage;
This alternating voltage is applied to the input of described three-phase bridge rectification power work loop 301 three-phase bridge rectification, and the output cathode in described three-phase bridge rectification power work loop 301 provides working power for described three in-gate circuits 303 and described executive circuit 305;
This alternating voltage is applied to the input of described three in-gate circuits 303 simultaneously, through described diode V7, described diode V8 and described diode V9 rectification, described resistor R1, described resistor R2 and described resistor R3 current limliting, described capacitor C1, after described capacitor C2 and described capacitor C3 filtering, gate potentials is set up at the input of described three in-gate circuits 303, make three triode V7 in described three in-gate circuits 303, V8, V9 is all in saturation conduction state, now, the output of described three in-gate circuits 303 is electronegative potential, it is also electronegative potential that thyristor VT1 in described executive circuit 305 controls pole, cannot conducting, circuit is in normal operating conditions,
When there is open-phase fault in circuit, namely three-phase electricity source comprise three-phase line load current circuit arbitrarily mutually occur broken string open-phase fault time, such as: power supply A phase arbitrary end broken string phase shortage, described three-phase annular voltage transformer PT1 vice-side winding Non voltage output will certainly be caused, the input of the triode V10 of described three in-gate circuits 303 is electronegative potential, the corresponding cut-off of described triode V10, the output of described three in-gate circuits 303 is high potential, charge to described capacitor C4 through described resistor R5, its charging process is time delay process (about 1 second), along with the reduction gradually of charging current, the control electrode potential of the thyristor VT1 of described executive circuit 305 increases gradually, described thyristor VT1 conducting, described single-stage automatic switch tripping coil TQ energized action, promote described single-stage automatic switch tripping mechanism 203 dropout tripping operation, described single-stage automatic switch dynamic/static contact 202 disconnects, the power-off of described ac contactor coil CJ decompression, then the dynamic/static contact FQ of described A.C. contactor disconnects the three phase mains of motor, complete default-phase protection function.
Shown by above-described embodiment analysis: adopt this without accessory power supply formula loss-of-phase protection arrangement; without the need to accessing back work power supply; have that wiring is easy, safe and reliable, stable performance, economical and practical, relatively extend the outstanding advantages such as the useful life of product.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope of request of the present invention protection.
Claims (1)
1., without an accessory power supply formula loss-of-phase protection arrangement, it is characterized in that: it comprises housing, the single-stage automatic switch be arranged in described housing, be provided with ON-OFF control circuit electric sub-member plate, three for forming the three-phase annular voltage transformer and the A.C. contactor for operating motor open-circuit operation of three-phase alternating current voltage follower circuit;
Described single-stage automatic switch comprises switch pedestal and is separately positioned on single-stage automatic switch dynamic/static contact, single-stage automatic switch tripping mechanism, single-stage automatic switch tripping coil TQ and the single-stage automatic switch dynamic/static contact lead-out terminal in described switch pedestal, one end of described single-stage automatic switch tripping mechanism connects described single-stage automatic switch dynamic/static contact, and the other end of described single-stage automatic switch tripping mechanism connects described single-stage automatic switch tripping coil TQ;
The former limit winding of three described three-phase annular voltage transformers is all connected to the power end of threephase motor, the vice-side winding head end of three described three-phase annular voltage transformers is respectively as three-phase output end, the vice-side winding tail end of three described three-phase annular voltage transformers is interconnected, thus forms described three-phase alternating current voltage follower circuit;
Described ON-OFF control circuit comprises three-phase bridge rectification power work loop, gate voltage current rectifying and wave filtering circuit, three in-gate circuits, three input gates export delay circuit and executive circuit, and wherein, described three-phase bridge rectification power work loop comprises diode V1, diode V2, diode V3, diode V4, diode V5 and diode V6, described diode V1, described diode V2, the three-phase output end of described three-phase alternating current voltage follower circuit is connected to respectively with the positive pole of described diode V3, the positive pole of described diode V1 connects the negative pole of described diode V4, the positive pole of described diode V2 connects the negative pole of described diode V5, the positive pole of described diode V3 connects the negative pole of described diode V6, described diode V1, described diode V2, the output cathode as this three-phase bridge rectification power work loop is interconnected, described diode V4 with the negative pole of described diode V3, the positive pole of described diode V5 and described diode V6 is interconnected output negative pole as this three-phase bridge rectification power work loop and ground connection,
Described gate voltage current rectifying and wave filtering circuit comprises diode V7, diode V8, diode V9, resistor R1, resistor R2, resistor R3, electrolytic capacitor C1, electrolytic capacitor C2 and electrolytic capacitor C3, described diode V7, described diode V8, the positive pole of described diode V9 is connected to the three-phase output end of described three-phase alternating current voltage follower circuit respectively, described diode V7, described resistor R1 is connected to the positive terminal of described electrolytic capacitor C1 after being connected in series, described diode V8, described resistor R2 is connected to the positive terminal of described electrolytic capacitor C2 after being connected in series, described diode V9, described resistor R3 is connected to the positive terminal of described electrolytic capacitor C3 after being connected in series, described electrolytic capacitor C1, the equal ground connection of negative pole end of described electrolytic capacitor C2 and described electrolytic capacitor C3,
Described three in-gate circuits comprise triode V10, triode V11, triode V12 and resistor R4, the base stage of described triode V10 is connected to the positive terminal of described electrolytic capacitor C1, the base stage of described triode V11 is connected to the positive terminal of described electrolytic capacitor C2, the base stage of described triode V12 is connected to the positive terminal of described electrolytic capacitor C3, the collector electrode of described triode V10 is connected to one end of described resistor R4, the other end of described resistor R4 connects the output cathode in described three-phase bridge rectification power work loop, the emitter of described triode V10 connects the collector electrode of described triode V11, the emitter of triode V11 connects the collector electrode of described triode V12, the emitter of described triode V12 connects the output negative pole in described three-phase bridge rectification power work loop to ground connection,
Described three input gates export delay circuit and comprise resistor R5 and electrolytic capacitor C4, one end of described resistor R5 is connected to the collector electrode of described triode V10, the other end of described resistor R5 connects the positive pole of described electrolytic capacitor C4, and the negative pole of described capacitor C4 connects the output negative pole in described three-phase bridge rectification power work loop to ground connection;
Described executive circuit comprises thyristor VT1 and described single-stage automatic switch tripping coil TQ, the control pole of described thyristor VT1 connects the positive pole of described capacitor C4, the negative electrode of described thyristor VT1 connects the output negative pole in described three-phase bridge rectification power work loop to ground connection, single-stage automatic switch tripping coil TQ described in cross-over connection between the anode of described thyristor VT1 and the output cathode in described three-phase bridge rectification power work loop;
Described single-stage automatic switch dynamic/static contact lead-out terminal is connected between the coil CJ of described A.C. contactor, and the dynamic/static contact FQ of described A.C. contactor is serially connected in the three-phase alternating-current supply of motor respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210381697.2A CN102842894B (en) | 2012-10-10 | 2012-10-10 | Motor open-phase protection device without auxiliary power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210381697.2A CN102842894B (en) | 2012-10-10 | 2012-10-10 | Motor open-phase protection device without auxiliary power supply |
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| CN102842894A CN102842894A (en) | 2012-12-26 |
| CN102842894B true CN102842894B (en) | 2015-04-22 |
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| CN201210381697.2A Expired - Fee Related CN102842894B (en) | 2012-10-10 | 2012-10-10 | Motor open-phase protection device without auxiliary power supply |
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| CN105896472A (en) * | 2015-01-26 | 2016-08-24 | 黄焕珠 | Phase loss protector of three-phase AC motor |
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| SU851610A1 (en) * | 1979-10-05 | 1981-07-30 | Научно-Производственное Объединение"Вниистройдормаш" | Device for protecting three-phase electric motor from incomplete-phase mode |
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Effective date of registration: 20180528 Address after: 454950 eastern section of Chuang Road, Wuzhi industrial agglomeration area, Jiaozuo, Henan Patentee after: Cable Polytron Technologies Inc. Address before: 451162 electric power company on the west side of Xingang road in Zhengzhou, Henan. Patentee before: HENAN KAIQI POWER INDUSTRY Co.,Ltd. |
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Granted publication date: 20150422 Termination date: 20211010 |