CN2324688Y - Phase-defect protector of three-phase electric motor for refrigerating equipment - Google Patents

Phase-defect protector of three-phase electric motor for refrigerating equipment Download PDF

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Publication number
CN2324688Y
CN2324688Y CN 98202894 CN98202894U CN2324688Y CN 2324688 Y CN2324688 Y CN 2324688Y CN 98202894 CN98202894 CN 98202894 CN 98202894 U CN98202894 U CN 98202894U CN 2324688 Y CN2324688 Y CN 2324688Y
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pin
circuit
links
resistance
capacitor
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CN 98202894
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毕文义
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Abstract

The utility model relates to an open-phase protector of a three-phase electric motor for refrigerating equipment, which is composed of a power circuit, a voltage forming circuit, a voltage comparison circuit, a data processing circuit, a driving executive circuit, a control signal output circuit and a self-holding circuit. The utility model has the function of separating the non-current of normal circuit from non-current caused by phase interruption, the utility model adopts digital circuits, the power consumption is small, and the stability is high. The utility model is suitable for the three-phase motors which requires frequent starting and stopping in refrigerating equipment.

Description

Refrigeration plant threephase motor phase-lacking protective device
The utility model relates to a kind of phase-lacking protective device of refrigeration plant threephase motor.
Existing a kind of threephase motor phase-lacking protective device scheme as shown in Figure 1; three phase lines of power supply are passed three saturated instrument transformers of speed respectively; three saturated instrument transformers of speed secondary, respectively through three halfwave rectifier filter circuits output control voltages, the NAND gate circuit of forming to three triodes.Under two kinds of situations of power supply phase shortage and motor interior broken string, all can play a protective role.It is simple to have circuit, is convenient to characteristics such as maintenance.But; the problem that its exists is: the circuit no current that can't distinguish the circuit no current under the normal condition and cause because of the phase failure; therefore it can only be applicable to the motor of manual control, and this has just limited the scope of application of this protective device, and is very inconvenient in actual applications.
The purpose of this utility model is intended to overcome the prior art deficiency and provides a kind of; the threephase motor phase-lacking protective device that the no current in the regular link and the circuit no current that causes because of the phase failure can be made a distinction is applicable to Fraquent start and the threephase motor that stops in the refrigeration plant.
The realization the technical solution of the utility model is:
Refrigeration plant threephase motor phase-lacking protective device comprises power circuit, voltage forming circuit, voltage comparator circuit, data processing circuit, driving executive circuit, self-hold circuit, control signal output circuit, it is characterized in that:
Voltage forming circuit is by the saturated instrument transformer L of speed 1, L 2, L 3, diode D 1, D 2, D 3, filter capacitor C 1, C 2, C 3Form fast saturated instrument transformer L 1One end ground connection, another terminating diode D 1Positive pole, capacitor C 1Positive pole and diode D 1The negative pole C point that links to each other forms voltage V C, capacitor C 1Minus earth, fast saturated instrument transformer L 2One end ground connection, another terminating diode D 2Positive pole, diode D 2Negative pole and capacitor C 2The anodal B point that links to each other forms voltage V B, capacitor C 2Minus earth, fast saturated instrument transformer L 3One end ground connection, the other end and diode D 3Anodal continuous, diode D 3Negative pole and capacitor C 3The anodal A point that links to each other forms voltage V A, capacitor C 3Minus earth;
Voltage comparator circuit is by potentiometer VR 1, VR 2, VR 3, resistance R 1, R 2, contain the ic chip of four comparators 1-CM324 forms, resistance R 1, R 2Be in series resistance R 1Last termination power+B, resistance R 2Lower end ground connection, resistance R 1, R 2Phase contact and IC 14. pin, 6. pin, 8. pin links to each other, as the reverse input end of voltage comparator, C point passes through potentiometer VR 1Link to each other potentiometer VR with ground 1Slip termination IC 15. pin, the B point is by potentiometer VR 2Link to each other potentiometer VR with ground 2Sliding end and IC 17. pin links to each other, and the A point is by potentiometer VR 3Link to each other potentiometer VR with ground 3Sliding end and IC 19. pin links to each other, IC 13. pin links to each other with power supply+B, IC 1The pin links to each other with ground;
Data processing circuit is by IC 2, IC 3Form IC 2, IC 3Be CC4023MD, include the integrated package of three NAND gate, IC 12. pin and IC 21. pin, 2. pin, 8. pin, IC 35. pin, resistance R 3One end is connected in E point, resistance R 3The other end connects power supply+B, IC 11. pin and IC 23. pin, 4. pin, 5. pin, IC 34. pin, resistance R 4One end is connected in F point, R 4The other end connects power supply+B, IC 1 pin and IC 2 pin, pin, pin, IC 33. pin, resistance R 5Be connected in the G point, resistance R 5The other end connects power supply+B, IC 29. pin and IC 31. pin links to each other, IC 26. pin and IC 32. pin links to each other, IC 210. pin and IC 38. link to each other IC 39. pin and IC 3 pin, pin link to each other IC 36. pin and IC 3The pin links to each other, IC 310. pin passes through resistance R 6Link to each other IC with triode BG base stage 2 pin, IC 3The pin meets power supply+B, IC 27., IC 37. pin ground connection;
The control signal output circuit is by relay normally open contact J 1-2Form relay normally open contact J 1-2Be connected in the A.C. contactor control coil loop;
Capacitor C 4Effect, be in threephase motor start and stop transfer process, eliminate the phase-lacking protective device misoperation, capacitor C 4With diode D 4Be in parallel capacitor C with relay J 4Positive pole and diode D 4Negative pole links to each other, capacitor C 4Negative pole and diode D 4Anodal linking to each other;
The utility model adopts digital circuit; power consumption is little, and stability is high, has solved existing phase-lacking protective device; the currentless problem of circuit that can't distinguish the no current in the regular link and cause because of the phase failure is applicable to require frequent starting and the threephase motor that stops in the refrigeration plant.
Fig. 1 is existing threephase motor phase-lacking protective device schematic diagram;
Fig. 2 is the utility model electrical schematic diagram.
Below in conjunction with accompanying drawing the technical solution of the utility model is further described:
The utility model can reach following function: 1, press start button QA, relay normally open contact J 1-1With closure, starting self-holding circuit, relay normally open contact J simultaneously 1-2The closed actuating coil loop of connecting A.C. contactor QC; 2, not being subjected to the threephase motor operating state is the influence of start and stop; 3, has only when the phase failure taking place among the threephase motor operation relay normally open contact J 1-2Disconnect, cut off the actuating coil loop of A.C. contactor, simultaneously relay normally open contact J 1-1Disconnect, remove self-holding circuit.Its course of work is: 1, start protective device, press the button QA, this moment, no current flow through fast saturated instrument transformer L 1, L 2, L 3, voltage V C, V B, V ABe electronegative potential, IC 12. pin, 1. pin, pin are electronegative potential, IC 29. pin, 6. pin, 10. pin is a high potential, IC 39. pin is an electronegative potential, IC 36. pin is a high potential, IC 310. pin is a high potential, triode BG conducting, and relay J is subjected to electricity, normal opened contact J 1-1Connect self-holding circuit, normal opened contact J 1-2Connect the actuating coil loop of A.C. contactor; 2, when actuating motor and symmetrical operation, fast saturated instrument transformer L 1, L 2, L 3All there is electric current to flow through V A, V B, V CBe high potential, IC 12. pin, 1. pin, pin are high potential, IC 29. pin, 6. pin, 10. pin is an electronegative potential, IC 39. pin is a high potential, IC 36. pin is an electronegative potential, IC 310. pin is a high potential, relay normally open contact J 1-1, J 1-2Closed; 3, in motor symmetrical operation process, when open phase fault takes place such as the phase failure of A phase, V ABe electronegative potential, V B, V CBe high potential, IC 12. pin, 1. pin output high potential, IC 1The pin is an electronegative potential, IC 29. pin, 6. pin is an electronegative potential, IC 210. pin is a high potential, IC 36. pin is a high potential, IC 39. pin is a high potential, IC 310. pin is an electronegative potential, and triode BG ends, relay J dead electricity, normal opened contact J 1-1, J 1-2Disconnect, remove self-holding circuit, cut off the actuating coil loop of A.C. contactor simultaneously.

Claims (2)

1, a kind of refrigeration plant threephase motor phase-lacking protective device comprises power circuit, voltage forming circuit, voltage comparator circuit, data processing circuit, self-hold circuit, control signal output circuit, drives executive circuit, it is characterized in that:
A, voltage forming circuit are run and instrument transformer L by speed 1, L 2, L 3, diode D 1, D 2, D 3, filter capacitor C 1, C 2, C 3Form fast saturated instrument transformer L 1One end ground connection, another terminating diode D 1Positive pole, capacitor C 1Positive pole and diode D 1The negative pole C point that links to each other, capacitor C 1Minus earth, fast saturated instrument transformer L 2One end ground connection, another terminating diode D 2Positive pole, diode D 2Negative pole and capacitor C 2The anodal B point that links to each other, capacitor C 2Minus earth, fast saturated instrument transformer L 3One end ground connection, the other end and diode D 3Anodal continuous, diode D 3Negative pole and capacitor C 3The anodal A point that links to each other, capacitor C 3Minus earth;
B, voltage comparator circuit are by potentiometer VR 1, VR 2, VR 3, resistance R 1, R 2, ic chip 1Form resistance R 1, R 2Be in series resistance R 1Last termination power+B, resistance R 2Lower end ground connection, resistance R 1, R 2Phase contact and IC 14. pin, 6. pin, 8. pin links to each other, C point passes through potentiometer VR 1Link to each other potentiometer VR with ground 1Slip termination IC 15. pin, the B point is by potentiometer VR 2Link to each other potentiometer VR with ground 2Sliding end and IC 17. pin links to each other, and the A point is by potentiometer VR 3Link to each other potentiometer VR with ground 3Sliding end and IC 19. pin links to each other, IC 13. pin links to each other with power supply+B, IC 1The pin links to each other with ground;
C, data processing circuit are by IC 2, IC 3Form IC 12. pin and IC 21. pin, 2. pin, 8. pin, IC 35. pin, resistance R 3One end is connected in E point, resistance R 3The other end connects power supply+B, IC 11. pin and IC 23. pin, 4. pin, 5. pin, IC 34. pin, resistance R 4One end is connected in F point, R 4The other end connects power supply+B, IC 1 pin and IC 2 pin, pin, pin, IC 33. pin, resistance R 5Connect the G point, resistance R 6The other end connects power supply+B, IC 29. pin and IC 31. pin links to each other, IC 26. pin and IC 32. pin links to each other, IC 210. pin and IC 38. pin links to each other, IC 39. pin and IC 3 pin, pin link to each other IC 36. pin and IC 3The pin links to each other, IC 310. pin passes through resistance R 6Link to each other IC with triode BG base stage 2 pin, IC 3The pin meets power supply+B, IC 27. pin, IC 37. pin ground connection;
D, control signal output circuit are by relay normally open contact J 1-2Form relay normally open contact J 1-2Be connected in the A.C. contactor QC control coil loop;
2, refrigeration plant threephase motor phase-lacking protective device according to claim 1 is characterized in that: capacitor C 4With diode D 4With relay J parallel connection, capacitor C 4Positive pole and diode D 4Negative pole links to each other, capacitor C 4Negative pole and diode D 4Anodal linking to each other.
CN 98202894 1998-04-08 1998-04-08 Phase-defect protector of three-phase electric motor for refrigerating equipment Expired - Fee Related CN2324688Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 98202894 CN2324688Y (en) 1998-04-08 1998-04-08 Phase-defect protector of three-phase electric motor for refrigerating equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 98202894 CN2324688Y (en) 1998-04-08 1998-04-08 Phase-defect protector of three-phase electric motor for refrigerating equipment

Publications (1)

Publication Number Publication Date
CN2324688Y true CN2324688Y (en) 1999-06-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN 98202894 Expired - Fee Related CN2324688Y (en) 1998-04-08 1998-04-08 Phase-defect protector of three-phase electric motor for refrigerating equipment

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102025128A (en) * 2010-12-23 2011-04-20 长沙广义变流技术有限公司 Default phase protection circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102025128A (en) * 2010-12-23 2011-04-20 长沙广义变流技术有限公司 Default phase protection circuit

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