CN219812092U - Automatic phase sequence motor protection control box - Google Patents
Automatic phase sequence motor protection control box Download PDFInfo
- Publication number
- CN219812092U CN219812092U CN202123183868.4U CN202123183868U CN219812092U CN 219812092 U CN219812092 U CN 219812092U CN 202123183868 U CN202123183868 U CN 202123183868U CN 219812092 U CN219812092 U CN 219812092U
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- phase
- phase alternating
- phase sequence
- current contactor
- alternating current
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- 238000000819 phase cycle Methods 0.000 title claims abstract description 68
- 230000001012 protector Effects 0.000 claims abstract description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- Protection Of Generators And Motors (AREA)
Abstract
The utility model relates to an automatic phase sequence motor protection control box, which comprises a box body, wherein an element mounting plate is arranged in the box body, a phase sequence relay, a leakage protection circuit breaker, a first three-phase alternating-current contactor, a second three-phase alternating-current contactor and a motor open-term overload protector are sequentially arranged on the element mounting plate, the input end of the leakage protection circuit breaker is connected with three-phase alternating current through a cable, and the output end of the leakage protection circuit breaker is connected with the input end of the phase sequence relay, the input end of the first three-phase alternating-current contactor and the input end of the second three-phase alternating-current contactor. The utility model is characterized in that the advantages are that: whether the three-phase alternating current power supply connected into the control box is in a forward phase sequence or in a reverse phase sequence, the load end of the control box is in a forward phase sequence, the automatic phase sequence adjustment reduces the wiring operation times and labor intensity, the safety is improved.
Description
Technical Field
The utility model relates to an automatic phase sequence motor protection control box, and relates to the field of motor control.
Background
In the occasion that the three-phase motor is not allowed to reversely rotate, a phase sequence protection circuit can be added, when the three-phase power is connected with the phase sequence error, the motor is not started, and the motor is connected with the forward rotation phase sequence by readjusting the connected three-phase power phase sequence. This re-access operation is inconvenient in use.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model provides an automatic phase sequence motor protection control box, which has the following technical scheme:
an automatic phase sequence motor protection control box comprises a box body, wherein an element mounting plate is mounted in the box body, a phase sequence relay, a leakage protection circuit breaker, a first three-phase alternating-current contactor, a second three-phase alternating-current contactor and a motor open-term overload protector are sequentially mounted on the element mounting plate, the input end of the leakage protection circuit breaker is connected with three-phase alternating current through a cable, the output end of the leakage protection circuit breaker is connected with the input end of the phase sequence relay, the input end of the first three-phase alternating-current contactor and the input end of the second three-phase alternating-current contactor, the output end of the phase sequence relay is also connected with the input ends of the first three-phase alternating-current contactor and the second three-phase alternating-current contactor, and the output ends of the first three-phase alternating-current contactor and the second three-phase alternating-current contactor are connected with a load end through the motor open-term overload protector; and a start switch, a closing switch and a cable connector are arranged outside the box body.
When the three-phase alternating current is positive phase sequence three-phase alternating current A-B-C, the phase sequence relay detects that the connected power supply is positive phase sequence, the normally closed contact of the phase sequence relay is closed, the normally open contact is opened, the three-phase alternating current contactor I is closed, and the three-phase alternating current contactor I wiring is connected with a load end according to A-B-C; the load end is positive phase sequence three-phase alternating current A-B-C; at the moment, the two parts of the three-phase alternating current contactor are in a disconnection state.
When the three-phase alternating current is reverse phase sequence three-phase alternating current A-C-B, the phase sequence relay 3 detects that the connected power supply is reverse phase sequence, a normally open contact of the phase sequence relay is closed, a normally closed contact is opened, the first three-phase alternating current contactor is opened and does not work, and the second three-phase alternating current contactor is closed; the wiring sequence of the three-phase alternating current contactor II is A-B-C, and the load end is connected with the three-phase alternating current A-B-C with positive phase sequence.
The utility model has the advantages that: whether the three-phase alternating current power supply connected into the control box is in a forward phase sequence or in a reverse phase sequence, the load end of the control box is in the forward phase sequence, and the automatic phase sequence adjustment reduces the wiring operation times, reduces the labor intensity and improves the safety.
Drawings
Fig. 1 is a schematic diagram of the main structure of the present utility model.
Fig. 2 is a schematic diagram of the working principle of the utility model for switching in the positive phase sequence three-phase power.
Fig. 3 is a schematic diagram of the working principle of the utility model for switching in reverse phase sequence three-phase power.
Detailed Description
The utility model will be further described with reference to specific embodiments, and advantages and features of the utility model will become apparent from the description. These examples are merely exemplary and do not limit the scope of the utility model in any way. It will be understood by those skilled in the art that various changes and substitutions of details and forms of the technical solution of the present utility model may be made without departing from the spirit and scope of the present utility model, but these changes and substitutions fall within the scope of the present utility model.
Referring to fig. 1 to 3, the utility model relates to an automatic phase sequence motor protection control box, which comprises a box body 1 and is characterized in that an element mounting plate 2 is arranged in the box body 1, a phase sequence relay 3, a leakage protection circuit breaker 4, a three-phase alternating current contactor one 5 (a first three-phase alternating current contactor), a three-phase alternating current contactor two 6 (a second three-phase alternating current contactor) and a motor open-term overload protector 7 are sequentially arranged on the element mounting plate 2, the input end of the leakage protection circuit breaker 5 is connected with three-phase alternating current through a cable, the output end of the leakage protection circuit breaker 5 is connected with the input end of the phase sequence relay 3, the input end of the three-phase alternating current contactor one 5 and the input end of the three-phase alternating current contactor two 6, the output end of the three-phase alternating current contactor one 5 and the output end of the three-phase alternating current contactor two 6 are connected with a load end (a motor) through the motor open-term overload protector 7; an on-switch 8, an off-switch 9 and a cable connector 10 are installed outside the case 1.
The utility model is characterized in that the working principle is as follows: when the three-phase alternating current is positive phase sequence three-phase alternating current A-B-C, the phase sequence relay 3 detects that the connected power supply is positive phase sequence, the normally closed contact of the phase sequence relay 3 is closed, the normally open contact is opened, the three-phase alternating current contactor I5 is closed, and the three-phase alternating current contactor I5 is connected with a load end according to A-B-C; the load end is a positive phase sequence three-phase alternating current A-B-C; at this time, the second three-phase alternating-current contactor 6 is in a disconnected state.
When the three-phase alternating current is reverse phase sequence three-phase alternating current A-C-B, the phase sequence relay 3 detects that the connected power supply is reverse phase sequence, a normally open contact of the phase sequence relay 3 is closed, a normally closed contact is opened, the first three-phase alternating current contactor 5 is opened and does not work, and the second three-phase alternating current contactor 6 is closed; the wiring sequence of the second 6 three-phase alternating-current contactor is A-B-C, and the load end is connected with the first three-phase alternating-current contactor into positive phase sequence A-B-C.
According to the utility model, no matter whether the connected three-phase alternating current power supply is in a forward phase sequence or in a reverse phase sequence, the load end connected with the control box is in the forward phase sequence, and the phase sequence is automatically adjusted, so that the wiring operation frequency is reduced, the labor intensity is reduced, and the safety is improved.
The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.
Claims (3)
1. The automatic phase sequence motor protection control box comprises a box body and is characterized in that an element mounting plate is mounted in the box body, a phase sequence relay, a leakage protection circuit breaker, a first three-phase alternating-current contactor, a second three-phase alternating-current contactor and a motor open-term overload protector are sequentially mounted on the element mounting plate, the input end of the leakage protection circuit breaker is connected with three-phase alternating current through a cable, the output end of the leakage protection circuit breaker is connected with the input end of the phase sequence relay, the input end of the first three-phase alternating-current contactor and the input end of the second three-phase alternating-current contactor, the output end of the phase sequence relay is also connected with the input ends of the first three-phase alternating-current contactor and the second three-phase alternating-current contactor, and the output ends of the first three-phase alternating-current contactor and the second three-phase alternating-current contactor are connected with a load end through the motor open-term overload protector; and a start switch, a closing switch and a cable connector are arranged outside the box body.
2. The automatic phase sequence motor protection control box according to claim 1, wherein when the three-phase alternating current is positive phase sequence three-phase alternating current a-B-C, the phase sequence relay detects that the connected power source is positive phase sequence, the normally closed contact of the phase sequence relay is closed, the normally open contact is opened, the three-phase alternating current contactor is closed, and the three-phase alternating current contactor is connected with a load end according to a-B-C; the load end is a positive phase sequence three-phase alternating current A-B-C; at the moment, the two parts of the three-phase alternating current contactor are in a disconnection state.
3. The automatic phase sequence motor protection control box according to claim 1, wherein when the three-phase alternating current is reverse phase sequence three-phase alternating current A-C-B, the phase sequence relay detects that the connected power source is reverse phase sequence, a normally open contact of the phase sequence relay is closed, a normally closed contact is opened, a first three-phase alternating current contactor is opened and does not work, and a second three-phase alternating current contactor is closed; the wiring sequence of the three-phase alternating current contactor II is A-B-C, and the load end is connected with the three-phase alternating current A-B-C with positive phase sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123183868.4U CN219812092U (en) | 2021-12-17 | 2021-12-17 | Automatic phase sequence motor protection control box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123183868.4U CN219812092U (en) | 2021-12-17 | 2021-12-17 | Automatic phase sequence motor protection control box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219812092U true CN219812092U (en) | 2023-10-10 |
Family
ID=88216969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123183868.4U Active CN219812092U (en) | 2021-12-17 | 2021-12-17 | Automatic phase sequence motor protection control box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219812092U (en) |
-
2021
- 2021-12-17 CN CN202123183868.4U patent/CN219812092U/en active Active
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