CN202817718U - Motor open-phase protecting device with no auxiliary power supply - Google Patents
Motor open-phase protecting device with no auxiliary power supply Download PDFInfo
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- CN202817718U CN202817718U CN 201220517044 CN201220517044U CN202817718U CN 202817718 U CN202817718 U CN 202817718U CN 201220517044 CN201220517044 CN 201220517044 CN 201220517044 U CN201220517044 U CN 201220517044U CN 202817718 U CN202817718 U CN 202817718U
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- automatic switch
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Abstract
The utility model provides a motor open-phase protecting device with no auxiliary power supply. The motor open-phase protecting device comprises a housing, a single-stage automatic switch arranged inside the housing, an electronic assembly plate provided with a switch control circuit, three three-phase annular voltage transformers forming a three-phase AC (Alternating Current) voltage output circuit and an AC contactor for performing motor circuit breaking operations. The electronic assembly plate processes the voltage signals collected by the three-phase annular voltage transformers and then controls the motion of the single-stage automatic switch so as to make the AC contactor work. An open-phase protecting function is then achieved. By arranging the switch control circuit, the motor open-phase protecting device has the power supply accessing means changed. Furthermore, the motor open-phase protecting device has the advantages of strong reliability, wiring simplicity, long service lifetime, cost effectiveness and practicality.
Description
Technical field
The utility model relates to a kind of three-phase motor open-phase protection equipment, specifically, has related to a kind of without accessory power supply formula loss-of-phase protection arrangement.
Background technology
Phase failure protection for three-phase motor is widely used in the circuit take threephase motor as power as a kind of low-voltage electrical apparatus protection equipment.But; in the operation of reality is used; this electronic product need access accessory power supply; this meeting is so that portions of electronics element and components and parts often bear the voltage between lines of 380V; thereby cause portions of electronics element and components and parts frequently to burn; the non-constant of reliability can't reach the purpose of open-phase protection in advance fully.
In order to solve the problem of above existence, people are seeking a kind of desirable technical solution always.
Summary of the invention
The purpose of this utility model is for the deficiencies in the prior art, thereby provides 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 scheme that the utility model adopts is: a kind of without accessory power supply formula loss-of-phase protection arrangement, it comprises housing, is arranged on the single-stage automatic switch in the described housing, the electric sub-member plate that is provided with ON-OFF control circuit, three A.C. contactors that are used for forming the three-phase annular voltage transformer of three-phase alternating current voltage follower circuit and are used for the operating motor open-circuit operation;
Described single-stage automatic switch comprises switch pedestal and is separately positioned on one pole automatic switch dynamic/static contact, one pole automatic switch tripping mechanism, one pole automatic switch tripping coil TQ and one pole automatic switch dynamic/static contact lead-out terminal on the 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 one pole automatic switch tripping coil TQ;
The former limit winding of three described three-phase annular voltage transformers all is connected to the power end of threephase motor, the secondary winding head end of three described three-phase annular voltage transformers is respectively as three-phase output end, the secondary winding tail end of three described three-phase annular voltage transformers interconnects, thereby consists of described three-phase alternating current voltage follower circuit;
Described ON-OFF control circuit comprises three-phase bridge rectification power work loop, the gate voltage current rectifying and wave filtering circuit, three in-gate circuits, three input gates output delay circuit and executive circuit, 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, be connected to respectively the three-phase output end of described three-phase alternating current voltage follower circuit 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, interconnect output cathode as this three-phase bridge rectification power work loop, described diode V4 with the negative pole of described diode V3, the positive pole of described diode V5 and described diode V6 interconnects output negative pole and the ground connection as this three-phase bridge rectification power work loop;
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 respectively the three-phase output end of described three-phase alternating current voltage follower circuit, described diode V7, be connected to the positive terminal of described electrolytic capacitor C1 after the described resistor R1 serial connection, described diode V8, be connected to the positive terminal of described electrolytic capacitor C2 after the described resistor R2 serial connection, described diode V9, be connected to the positive terminal of described electrolytic capacitor C3 after the described resistor R3 serial connection, 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 in the positive terminal of described electrolytic capacitor C1, the base stage of described triode V11 is connected in the positive terminal of described electrolytic capacitor C2, the base stage of described triode V12 is connected in the positive terminal of described electrolytic capacitor C3, the collector electrode of described triode V10 is connected in the 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, and 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 output delay circuit comprises resistor R5 and electrolytic capacitor C4, the 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 one pole automatic switch tripping coil TQ, the control utmost point 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, the described one pole automatic switch of cross-over connection tripping coil TQ between the output cathode in the anode of described thyristor VT1 and described three-phase bridge rectification power work loop;
Described one pole 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 respectively in the three-phase alternating-current supply of motor.
The relative prior art of the utility model has substantive distinguishing features and progress; specifically; the utility model has changed the power supply access way of loss-of-phase protection arrangement by ON-OFF control circuit is set, and has that reliability is strong, wiring is easy, a long service life, economical and practical advantage.
Description of drawings
Fig. 1 is surface structure schematic diagram of the present utility model.
Fig. 2 is the structural representation of one pole automatic switch.
Fig. 3 is circuit working principle schematic of the present utility model.
Embodiment
Below by embodiment, the technical solution of the utility model 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 the described housing 1; the A.C. contactor that 3, three of electric sub-member plates that are provided with ON-OFF control circuit are used for forming three-phase annular voltage transformer PT1, PT2, the PT3 of three-phase alternating current voltage follower circuit and are used for the operating motor open-circuit operation is provided with phase line through hole 4 on the described housing 1.
As shown in Figure 2, described single-stage automatic switch comprises switch pedestal 201 and is separately positioned on one pole automatic switch dynamic/static contact 202, one pole automatic switch tripping mechanism 203, one pole automatic switch tripping coil TQ204 and one pole automatic switch dynamic/static contact lead-out terminal 205 on the described switch pedestal 201, one end of described one pole automatic switch tripping mechanism 203 connects described one pole automatic switch dynamic/static contact 202, and the other end of described one pole automatic switch tripping mechanism 203 connects described one pole 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 secondary winding head end of three-phase annular voltage transformer PT1, PT2, PT3 is respectively as three-phase output end, the secondary winding tail end of three-phase annular voltage transformer PT1, PT2, PT3 then interconnects, and consists of 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 output delay circuit 304 and executive circuit 305, 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, be connected to respectively the three-phase output end of described three-phase alternating current voltage follower circuit 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, interconnect output cathode as this three-phase bridge rectification power work loop 301, described diode V4 with the negative pole of described diode V3, described diode V5, interconnect output negative pole and ground connection as this three-phase bridge rectification power work loop 301 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 respectively the three-phase output end of described three-phase alternating current voltage follower circuit, described diode V7, be connected to the positive terminal of described electrolytic capacitor C1 after the described resistor R1 serial connection, described diode V8, be connected to the positive terminal of described electrolytic capacitor C2 after the described resistor R2 serial connection, described diode V9, be connected to the positive terminal of described electrolytic capacitor C3 after the described resistor R3 serial connection, 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 in the positive terminal of described electrolytic capacitor C1, the base stage of described triode V11 is connected in the positive terminal of described electrolytic capacitor C2, the base stage of described triode V12 is connected in the positive terminal of described electrolytic capacitor C3, the collector electrode of described triode V10 is connected in the 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, and 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 output delay circuit 304 comprises resistor R5 and electrolytic capacitor C4, the 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 one pole automatic switch tripping coil TQ, the control utmost point 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 cross-over connection has described one pole automatic switch tripping coil TQ between the output cathode in the anode of described thyristor VT1 and described three-phase bridge rectification power work loop 301;
Described one pole 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 respectively in the three-phase alternating-current supply of motor.
When this comes into operation without accessory power supply formula loss-of-phase protection arrangement, operate described operating grip 2 and make described one pole automatic switch 101 closures, device is operation normally.
The realization of default-phase protection function: under normal circumstances, three-phase line load loop current consists of current circuit by three annular voltage transformer PT1, PT2, PT3, at this moment, at the secondary winding induced electromotive force of three-phase annular voltage transformer PT1, PT2, PT3 (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 rectifications, 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 the described capacitor C3 filtering, set up the gate pole current potential at the input of described three in-gate circuits 303, so that three triode V7 in described three in-gate circuits 303, V8, V9 all is in the saturation conduction state, at this moment, the output of described three in-gate circuits 303 is electronegative potential, the thyristor VT1 control utmost point in the described executive circuit 305 also is electronegative potential, can't conducting, circuit is in normal operating conditions;
When open-phase fault appears in circuit; namely when the three-phase electricity source comprises that three-phase line load current circuit the broken string open-phase fault occurs arbitrarily mutually; for example: power supply A phase arbitrary end broken string phase shortage; will certainly cause described three-phase annular voltage transformer PT1 secondary winding Non voltage output; 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 reducing gradually of charging current; the control electrode potential of the thyristor VT1 of described executive circuit 305 increases gradually; described thyristor VT1 conducting; described one pole automatic switch tripping coil TQ gets electronic work; promote described one pole automatic switch tripping mechanism 203 dropout tripping operations; described one pole automatic switch dynamic/static contact 202 disconnects; described ac contactor coil CJ decompression outage; then the dynamic/static contact FQ of described A.C. contactor disconnects the three phase mains of motor, finishes default-phase protection function.
The analysis showed that by above-described embodiment: adopt this without accessory power supply formula loss-of-phase protection arrangement; need not to access the back work power supply; have that wiring is easy, safe and reliable, stable performance, economical and practical, relatively prolonged the outstanding advantages such as useful life of product.
Should be noted that at last: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although with reference to preferred embodiment the utility model is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characterictic is equal to replacement embodiment of the present utility model; And not breaking away from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technical scheme scope that the utility model asks for protection.
Claims (1)
1. one kind without accessory power supply formula loss-of-phase protection arrangement, it is characterized in that: it comprises housing, is arranged on the single-stage automatic switch in the described housing, the electric sub-member plate that is provided with ON-OFF control circuit, three A.C. contactors that are used for forming the three-phase annular voltage transformers of three-phase alternating current voltage follower circuit and are used for the operating motor open-circuit operation;
Described single-stage automatic switch comprises switch pedestal and is separately positioned on one pole automatic switch dynamic/static contact, one pole automatic switch tripping mechanism, one pole automatic switch tripping coil TQ and one pole automatic switch dynamic/static contact lead-out terminal on the 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 one pole automatic switch tripping coil TQ;
The former limit winding of three described three-phase annular voltage transformers all is connected to the power end of threephase motor, the secondary winding head end of three described three-phase annular voltage transformers is respectively as three-phase output end, the secondary winding tail end of three described three-phase annular voltage transformers interconnects, thereby consists of described three-phase alternating current voltage follower circuit;
Described ON-OFF control circuit comprises three-phase bridge rectification power work loop, the gate voltage current rectifying and wave filtering circuit, three in-gate circuits, three input gates output delay circuit and executive circuit, 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, be connected to respectively the three-phase output end of described three-phase alternating current voltage follower circuit 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, interconnect output cathode as this three-phase bridge rectification power work loop, described diode V4 with the negative pole of described diode V3, the positive pole of described diode V5 and described diode V6 interconnects output negative pole and the ground connection as this three-phase bridge rectification power work loop;
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 respectively the three-phase output end of described three-phase alternating current voltage follower circuit, described diode V7, be connected to the positive terminal of described electrolytic capacitor C1 after the described resistor R1 serial connection, described diode V8, be connected to the positive terminal of described electrolytic capacitor C2 after the described resistor R2 serial connection, described diode V9, be connected to the positive terminal of described electrolytic capacitor C3 after the described resistor R3 serial connection, 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 in the positive terminal of described electrolytic capacitor C1, the base stage of described triode V11 is connected in the positive terminal of described electrolytic capacitor C2, the base stage of described triode V12 is connected in the positive terminal of described electrolytic capacitor C3, the collector electrode of described triode V10 is connected in the 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, and 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 output delay circuit comprises resistor R5 and electrolytic capacitor C4, the 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 one pole automatic switch tripping coil TQ, the control utmost point 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, the described one pole automatic switch of cross-over connection tripping coil TQ between the output cathode in the anode of described thyristor VT1 and described three-phase bridge rectification power work loop;
Described one pole 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 respectively in the three-phase alternating-current supply of motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220517044 CN202817718U (en) | 2012-10-10 | 2012-10-10 | Motor open-phase protecting device with no auxiliary power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220517044 CN202817718U (en) | 2012-10-10 | 2012-10-10 | Motor open-phase protecting device with no auxiliary power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202817718U true CN202817718U (en) | 2013-03-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220517044 Withdrawn - After Issue CN202817718U (en) | 2012-10-10 | 2012-10-10 | Motor open-phase protecting device with no auxiliary power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202817718U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102842894A (en) * | 2012-10-10 | 2012-12-26 | 河南开启电力实业有限公司 | Motor open-phase protection device without auxiliary power supply |
-
2012
- 2012-10-10 CN CN 201220517044 patent/CN202817718U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102842894A (en) * | 2012-10-10 | 2012-12-26 | 河南开启电力实业有限公司 | Motor open-phase protection device without auxiliary power supply |
| CN102842894B (en) * | 2012-10-10 | 2015-04-22 | 河南开启电力实业有限公司 | Motor open-phase protection device without auxiliary power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130320 Effective date of abandoning: 20150422 |