CN210693809U - High-voltage frequency conversion soft start system of synchronous motor - Google Patents
High-voltage frequency conversion soft start system of synchronous motor Download PDFInfo
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- CN210693809U CN210693809U CN201922288707.8U CN201922288707U CN210693809U CN 210693809 U CN210693809 U CN 210693809U CN 201922288707 U CN201922288707 U CN 201922288707U CN 210693809 U CN210693809 U CN 210693809U
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Abstract
The utility model discloses a synchronous machine high pressure frequency conversion soft start system, include: a first branch, a second branch, a third branch; the starting circuit comprises a step-down transformer, an input selector is connected with the output end of the step-down transformer, the input end of the input selector can be selectively connected with the input end of a frequency converter I or a frequency converter II, the input end of the output selector can be selectively connected with the output end of the frequency converter I or the output end of the frequency converter II, the output end of the output selector is connected with the input end of a step-up transformer, and the output end of the step-up transformer is respectively connected with a starting circuit breaker I, a starting circuit breaker II and a starting circuit breaker III. The utility model discloses the mode that the accessible was switched selects different converter timesharing to combine with step-down transformer, step-up transformer, realizes carrying out the purpose of high-pressure frequency conversion soft start one by one to many synchronous machine timesharing, has improved the utilization ratio of equipment, has reduced use cost, has ensured safety in production.
Description
Technical Field
The utility model belongs to the technical field of motor control, especially, relate to a synchronous machine high pressure frequency conversion soft start system.
Background
In enterprise production, in order to save the investment of equipment, a set of high-voltage frequency conversion soft start system is generally adopted to start a plurality of synchronous motors one by one in a time-sharing manner, but years of operation practice proves that the problem of poor reliability exists by adopting a one-drive-more method, the reason is that a frequency converter is easy to break down, and the production is often influenced greatly, in recent years, part of production enterprises adopt a one-use-one-standby mode in order to ensure that the frequency conversion soft start system can run reliably, namely, a set of frequency conversion soft start system is newly added on the basis of the original set of frequency conversion soft start system, and the configuration method has the defects that: firstly, the equipment cost is increased; secondly, the size of the step-down transformer and the step-up transformer is large, a factory building needs to be additionally arranged, and the civil engineering cost is increased; and thirdly, other auxiliary equipment is required to be added, and the investment cost is further increased.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that exists, the utility model provides a synchronous machine high pressure frequency conversion soft start system, the mode that this system's accessible was switched selects different converter timesharing to combine with step-down transformer, step-up transformer, realizes carrying out the purpose of high pressure frequency conversion soft start one by one to many synchronous machine timesharing, has improved the utilization ratio of equipment, has reduced use cost, has ensured safety in production.
In order to achieve the above object, the present invention adopts the following technical solutions, including:
the system comprises a first branch circuit, a second branch circuit and a third branch circuit, wherein the first branch circuit comprises an operation circuit breaker I connected with a high-voltage bus, and the other end of the operation circuit breaker I is connected with a synchronous motor I;
the second branch circuit comprises an operation circuit breaker II connected with the high-voltage bus, and the other end of the operation circuit breaker II is connected with a synchronous motor II;
the third branch comprises an operation circuit breaker III connected with the high-voltage bus, and the other end of the operation circuit breaker III is connected with a synchronous motor III;
still including starting the branch road, start the branch road including the power breaker who connects high-voltage bus, step down transformer's input is connected to power breaker's the other end, input selector is connected to step down transformer's output, the optional input of connecting converter I or converter II of the output of input selector, the optional output of connecting converter I or converter II of the input of output selector, step up transformer's input is connected to output of output selector, start circuit breaker I, start circuit breaker II, start circuit breaker III are connected respectively to step up transformer's output, synchronous machine I is connected to the other end of start circuit breaker I, synchronous machine II is connected to the other end of start circuit breaker II, synchronous machine III is connected to the other end of start circuit breaker III.
The input selector is an input selection switch, the input of the input selection switch is connected with the output end of the step-down transformer, and the output of the input selection switch is selectively connected with the input end of the frequency converter I or the input end of the frequency converter II; the output selector is an output selection switch, the input of the output selection switch is synchronous with the output of the input selection switch, the output selector can be selectively connected with the output end of the frequency converter I or the output end of the frequency converter II, and the output of the output selection switch is connected with the input end of the boosting transformer.
The input selector is an input circuit breaker I and an input circuit breaker II, the input of the input circuit breaker I can be selectively connected with or disconnected with the output end of the step-down transformer, and the output of the input circuit breaker I is connected with the input end of the frequency converter I; the input of the input circuit breaker II is selectively connected or disconnected with the output end of the step-down transformer, and the output of the input circuit breaker II is connected with the input end of the frequency converter II; the output selector is an output circuit breaker I and an output circuit breaker II, the input of the output circuit breaker I is connected with the output end of the frequency converter I, the output of the output circuit breaker I is synchronous with the input of the input circuit breaker I, and the input end of the step-up transformer can be selectively connected or disconnected; the input end of the output circuit breaker II is connected with the output end of the frequency converter II, the output end of the output circuit breaker II is synchronous with the input end of the input circuit breaker II, and the input end of the step-up transformer can be selectively connected or disconnected.
And the frequency converter I and the frequency converter II are both LCI frequency converters.
The utility model relates to a synchronous machine high pressure frequency conversion soft start system, the mode that this system's accessible was switched selects different converter timesharing to combine with step-down transformer, step-up transformer, realizes carrying out the purpose of high pressure frequency conversion soft start one by one to many synchronous machine timesharing, has improved the utilization ratio of equipment, has reduced use cost, has ensured safety in production.
Drawings
Fig. 1 is an electrical schematic diagram of a first embodiment of the present invention.
Fig. 2 is an electrical schematic diagram of a second embodiment of the present invention.
Fig. 3 is an electrical schematic diagram of an original synchronous motor high-voltage frequency conversion soft start system.
Detailed Description
In order to make the skilled in the art have a clear understanding of the present invention, a brief explanation is first made on the original synchronous motor high-voltage frequency conversion soft start system, as shown in fig. 3, the original synchronous motor high-voltage frequency conversion soft start system is composed of two sets of mutually independent devices, namely: the step-down transformer I2, the frequency converter I1 and the step-up transformer I3 form a set of starting device; the step-down transformer II 21, the frequency converter II 20 and the step-up transformer II 22 form another set of starting device, so that the original synchronous motor high-voltage frequency conversion soft starting system needs two step-down transformers and two step-up transformers, other accessory equipment is added, the investment of equipment and capital construction is obviously increased, and the utilization rate of the equipment is reduced.
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, the present invention includes,
the system comprises a first branch circuit, a second branch circuit and a third branch circuit, wherein the first branch circuit comprises an operation circuit breaker I10 connected with a high-voltage bus 4, and the other end of the operation circuit breaker I is connected with a synchronous motor I M1;
the second branch circuit comprises an operation circuit breaker II 13 connected with a high-voltage bus, and the other end of the operation circuit breaker II is connected with a synchronous motor II M2;
the third branch comprises an operation circuit breaker III 16 connected with a high-voltage bus, and the other end of the operation circuit breaker III is connected with a synchronous motor IIIM 3;
still including starting the branch road, start the branch road including the power breaker 9 who connects high-voltage bus, step down transformer 2's input is connected to power breaker's the other end, input selector is connected to step down transformer's output, the optional input of connecting converter I1 or converter II 20 of the output of input selector, the optional output of connecting converter I or converter II of the input of output selector, step up transformer 3's input is connected to output of output selector, step up transformer's output is connected respectively and is started circuit breaker I11, start circuit breaker II 14, start circuit breaker III 17, synchronous machine I is connected to the other end that starts circuit breaker I, synchronous machine II is connected to the other end that starts circuit breaker II, synchronous machine III is connected to the other end that starts circuit breaker III.
As a first embodiment of the present invention, as shown in fig. 1, the input selector is an input selector switch 25, an input of the input selector switch is connected to an output end of the step-down transformer, and an output of the input selector switch is selectively connected to an input end of the frequency converter i or an input end of the frequency converter ii; the output selector is an output selection switch 27, the input of the output selection switch is synchronous with the output of the input selection switch, the output selector can be selectively connected with the output end of the frequency converter I or the output end of the frequency converter II, and the output of the output selection switch is connected with the input end of the step-up transformer.
As a second embodiment of the present invention, as shown in fig. 2, the input selector is an input circuit breaker i 29 and an input circuit breaker ii 33, the input of the input circuit breaker i selectively connects or disconnects the output end of the step-down transformer, and the output of the input circuit breaker i is connected to the input end of the frequency converter i; the input of the input circuit breaker II is selectively connected or disconnected with the output end of the step-down transformer, and the output of the input circuit breaker II is connected with the input end of the frequency converter II; the output selector is an output circuit breaker I31 and an output circuit breaker II 35, the input of the output circuit breaker I is connected with the output end of the frequency converter I, the output of the output circuit breaker I is synchronous with the input of the input circuit breaker I, and the input end of the step-up transformer can be selectively connected or disconnected; the input end of the output circuit breaker II is connected with the output end of the frequency converter II, the output end of the output circuit breaker II is synchronous with the input end of the input circuit breaker II, and the input end of the step-up transformer can be selectively connected or disconnected.
Preferably, the frequency converter I and the frequency converter II are both LCI frequency converters.
As a first embodiment, when an input selection switch is connected with an input end of a frequency converter I, and an output selection switch is connected with an output end of the frequency converter I, at the moment, a step-down transformer, the frequency converter I and a step-up transformer form a starting device, the voltage output by the step-down transformer is subjected to frequency conversion through the frequency converter I, then is boosted by the step-up transformer and is respectively transmitted to a starting circuit breaker I, a starting circuit breaker II and a starting circuit breaker III, when a synchronous motor I needs to be started, the starting circuit breaker I is closed (the starting circuit breaker II and the starting circuit breaker III are both disconnected), the synchronous motor I is started, and after the synchronous motor I is started, the starting circuit; when the synchronous motor II needs to be started, the starting circuit breaker II is closed (the starting circuit breaker I and the starting circuit breaker III are both disconnected), the synchronous motor II is started, and the starting circuit breaker II is disconnected after the synchronous motor II is started; when synchronous machine III needs to be started, a starting circuit breaker III is closed (starting circuit breaker I and starting circuit breaker II are both disconnected), the synchronous machine III is started, and after the synchronous machine III is started, the starting circuit breaker III is disconnected. When the input selection switch is connected with the input end of the frequency converter II and the output selection switch is connected with the output end of the frequency converter II, the step-down transformer, the frequency converter II and the step-up transformer form a starting device at the moment, and the working principle of the starting device is the same as that of the starting device.
As a second embodiment, when an input breaker I is connected with a step-down transformer, and an output breaker I is connected with a step-up transformer (the input breaker II and the output breaker II are disconnected), the step-down transformer, a frequency converter I and the step-up transformer form a starting device, the voltage output by the step-down transformer is subjected to frequency conversion through the frequency converter I, and then is respectively transmitted to a starting breaker I, a starting breaker II and a starting breaker III after being boosted by the step-up transformer, when a synchronous motor I needs to be started, the starting breaker I is closed (the starting breaker II and the starting breaker III are both disconnected), the synchronous motor I is started, and the starting breaker I is disconnected after the synchronous motor I is started; when the synchronous motor II needs to be started, the starting circuit breaker II is closed (the starting circuit breaker I and the starting circuit breaker III are both disconnected), the synchronous motor II is started, and the starting circuit breaker II is disconnected after the synchronous motor II is started; when synchronous machine III needs to be started, a starting circuit breaker III is closed (starting circuit breaker I and starting circuit breaker II are both disconnected), the synchronous machine III is started, and after the synchronous machine III is started, the starting circuit breaker III is disconnected. When the input circuit breaker II is connected with the step-down transformer and the output circuit breaker II is connected with the step-up transformer (the input circuit breaker I and the output circuit breaker I are disconnected), at the moment, the step-down transformer, the frequency converter II and the step-up transformer form a starting device, and the working principle of the starting device is the same as that of the starting device.
It can be seen that the utility model discloses under the prerequisite that does not reduce the start-up effect, saved a step-down transformer, a step-up transformer, practiced thrift the input of fund greatly. As a further improvement, the second embodiment selects the circuit breaker as the input/output selector, so as to disconnect the frequency converter from the power supply in the non-operating state, which is beneficial to reducing loss and prolonging the service life of the frequency converter.
The utility model relates to a synchronous machine high pressure frequency conversion soft start system, the mode that this system's accessible was switched selects different converter timesharing to combine with step-down transformer, step-up transformer, realizes carrying out the purpose of high pressure frequency conversion soft start one by one to many synchronous machine timesharing, has improved the utilization ratio of equipment, has reduced use cost, has ensured safety in production.
Claims (4)
1. A high-voltage frequency conversion soft start system of a synchronous motor comprises,
the system comprises a first branch circuit, a second branch circuit and a third branch circuit, wherein the first branch circuit comprises an operation circuit breaker I (10) connected with a high-voltage bus (4), and the other end of the operation circuit breaker I is connected with a synchronous motor I (M1);
the second branch circuit comprises an operation circuit breaker II (13) connected with the high-voltage bus, and the other end of the operation circuit breaker II is connected with a synchronous motor II (M2);
the third branch comprises an operation circuit breaker III (16) connected with the high-voltage bus, and the other end of the operation circuit breaker III is connected with a synchronous motor III (M3);
the method is characterized in that: the starting circuit comprises a power circuit breaker (9) connected with a high-voltage bus, the other end of the power circuit breaker is connected with the input end of a step-down transformer (2), the output end of the step-down transformer is connected with an input selector, the output of the input selector can be selectively connected with the input end of a frequency converter I (1) or a frequency converter II (20), the input of the output selector can be selectively connected with the output end of the frequency converter I or the frequency converter II, the output of the output selector is connected with the input end of a step-up transformer (3), the output end of the step-up transformer is respectively connected with a starting circuit breaker I (11), a starting circuit breaker II (14) and a starting circuit breaker III, synchronous machine I is connected to the other end of starting circuit breaker I, synchronous machine II is connected to the other end of starting circuit breaker II, synchronous machine III is connected to the other end of starting circuit breaker III.
2. The high-voltage frequency conversion soft start system of the synchronous motor according to claim 1, characterized in that: the input selector is an input selection switch (25), the input of the input selection switch is connected with the output end of the step-down transformer, and the output of the input selection switch is selectively connected with the input end of the frequency converter I or the input end of the frequency converter II; the output selector is an output selection switch (27), the input of the output selection switch is synchronous with the output of the input selection switch, the output selector can be selectively connected with the output end of the frequency converter I or the output end of the frequency converter II, and the output of the output selection switch is connected with the input end of the step-up transformer.
3. The high-voltage frequency conversion soft start system of the synchronous motor according to claim 1, characterized in that: the input selector is an input circuit breaker I (29) and an input circuit breaker II (33), the input of the input circuit breaker I can be selectively connected with or disconnected with the output end of the step-down transformer, and the output of the input circuit breaker I is connected with the input end of the frequency converter I; the input of the input circuit breaker II is selectively connected or disconnected with the output end of the step-down transformer, and the output of the input circuit breaker II is connected with the input end of the frequency converter II; the output selector is an output circuit breaker I (31) and an output circuit breaker II (35), the input of the output circuit breaker I is connected with the output end of the frequency converter I, the output of the output circuit breaker I is synchronous with the input of the input circuit breaker I, and the input end of the step-up transformer can be selectively connected or disconnected; the input end of the output circuit breaker II is connected with the output end of the frequency converter II, the output end of the output circuit breaker II is synchronous with the input end of the input circuit breaker II, and the input end of the step-up transformer can be selectively connected or disconnected.
4. The synchronous machine high-voltage frequency conversion soft start system according to any one of claims 1 to 3, characterized in that: and the frequency converter I and the frequency converter II are both LCI frequency converters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922288707.8U CN210693809U (en) | 2019-12-19 | 2019-12-19 | High-voltage frequency conversion soft start system of synchronous motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922288707.8U CN210693809U (en) | 2019-12-19 | 2019-12-19 | High-voltage frequency conversion soft start system of synchronous motor |
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| CN210693809U true CN210693809U (en) | 2020-06-05 |
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| CN201922288707.8U Active CN210693809U (en) | 2019-12-19 | 2019-12-19 | High-voltage frequency conversion soft start system of synchronous motor |
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