CN2253538Y - Phase failure protection for three-phase motor - Google Patents
Phase failure protection for three-phase motor Download PDFInfo
- Publication number
- CN2253538Y CN2253538Y CN 95227422 CN95227422U CN2253538Y CN 2253538 Y CN2253538 Y CN 2253538Y CN 95227422 CN95227422 CN 95227422 CN 95227422 U CN95227422 U CN 95227422U CN 2253538 Y CN2253538 Y CN 2253538Y
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- CN
- China
- Prior art keywords
- contact
- phase
- contactor
- motor
- relay
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to an open-phase protective device for a three-phase motor, which is composed of three fast saturated transformers, a rectifying bridge, an intermediate relay J, a contactor QC, etc. which are connected. A relay coil S is connected in series with the contact J2 of the intermediate relay J and then connected in parallel with a contactor coil QC, and the contact S1 of a time relay is connected in parallel with the contact J1 of the intermediate relay. The utility model has the characteristics of simple structure, etc., and the utility model is suitable for the direct starting and indirect starting of motors.
Description
The utility model relates to a kind of threephase motor phase-lacking protective device.
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, the secondary open-delta that is in turn connected into of three saturated instrument transformers of speed, opening termination auxiliary relay J.Under two kinds of situations of power supply phase shortage and motor interior broken string, all can play a protective role.It can also be applicable to the motor of △ type and wye connection in addition.Have circuit simple, be convenient to characteristics such as maintenance.But the problem that it exists is: the startup of protective device depends on the operating current of motor.Therefore, it can only be used for the situation that motor directly starts, and promptly protective device and motor must start simultaneously and could work.This has just limited the scope of application of this protective device, in actual applications very inconvenience.
The purpose of this utility model be intended to overcome the deficiency of prior art and provide a kind of simple in structure, be applicable to the threephase motor phase-lacking protective device that motor directly or indirectly starts.
The utility model is connected to form by three saturated instrument transformers of speed, rectifier bridge, components and parts such as auxiliary relay J, contactor QC.In parallel with contactor coil QC again after the utility model time relay coil S and the auxiliary relay contact J2 series connection, the contact S1 of the time relay is in parallel with auxiliary relay contact J1.
The utlity model has simple in structure, be applicable to directly or indirectly characteristics such as startup of motor.It has solved the problem that must start the ability operate as normal with motor simultaneously that present protective device exists, and is convenient in actual applications.
Fig. 1 is existing threephase motor phase-lacking protective device electrical 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 is to have increased a time relay S on the basis of as shown in Figure 1 existing threephase motor phase-lacking protective device, makes it to reach following function: when 1, motor does not start, can starting contactor QC, and energized; 2, when motor start-up and normal operation, contactor QC still keeps on-state; 3, have only when open phase fault takes place, contactor QC just can reset, and cuts off the electricity supply.Concrete scheme as shown in Figure 2, it is connected to form by three saturated instrument transformers of speed, rectifier bridge, components and parts such as auxiliary relay J, contactor QC.In parallel with contactor coil QC again after time relay coil S and the auxiliary relay contact J2 series connection, the contact S1 of the time relay is in parallel with auxiliary relay contact J1.Its course of work is: when 1, starting protective device, press the button QA, contactor QC action, time relay S action make contactor QC main contact closure, energized by contact QC1 and S1; 2, when actuating motor and symmetrical operation, auxiliary relay J action, the disconnection of delay time of its contact J2 relay break time, its contact S1, auxiliary relay contact J1 in S1 time-delay process when contact S1 disconnects, the effect of replacement S1.At this moment, the main contact of contactor QC continues to keep on-state; 3, when open phase fault took place, auxiliary relay J resetted, and contact J1 disconnects, and contactor QC is resetted, and cut off the electricity supply, and realized that protective device and protection electrical equipment can independently start separately.
Claims (1)
1, a kind of threephase motor phase-lacking protective device; it is connected to form by three saturated instrument transformers of speed, rectifier bridge, components and parts such as auxiliary relay J, contactor QC; it is characterized in that time relay coil S and auxiliary relay contact J2 are in parallel with contactor coil QC again after connecting, the contact S1 of the time relay is in parallel with auxiliary relay contact J1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95227422 CN2253538Y (en) | 1995-11-15 | 1995-11-15 | Phase failure protection for three-phase motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95227422 CN2253538Y (en) | 1995-11-15 | 1995-11-15 | Phase failure protection for three-phase motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2253538Y true CN2253538Y (en) | 1997-04-30 |
Family
ID=33873277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95227422 Expired - Fee Related CN2253538Y (en) | 1995-11-15 | 1995-11-15 | Phase failure protection for three-phase motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2253538Y (en) |
-
1995
- 1995-11-15 CN CN 95227422 patent/CN2253538Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |