CN219740231U - High-voltage frequency converter switching controllable reactance bypass soft start system - Google Patents
High-voltage frequency converter switching controllable reactance bypass soft start system Download PDFInfo
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- CN219740231U CN219740231U CN202321122283.8U CN202321122283U CN219740231U CN 219740231 U CN219740231 U CN 219740231U CN 202321122283 U CN202321122283 U CN 202321122283U CN 219740231 U CN219740231 U CN 219740231U
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- 238000002955 isolation Methods 0.000 claims abstract description 39
- 239000007858 starting material Substances 0.000 claims abstract description 26
- 238000012423 maintenance Methods 0.000 abstract description 7
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- 238000006243 chemical reaction Methods 0.000 description 2
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Abstract
The utility model discloses a high-voltage frequency converter switching controllable reactance bypass soft start system, which particularly relates to the technical field of frequency converters, and comprises a frequency converter and a soft start bypass, wherein the frequency converter and the soft start bypass comprise the frequency converter and a soft starter connected with the frequency converter in parallel, and a bypass soft start line contactor KM2, a bypass soft start line isolation disconnecting link QS2 and a soft start bypass line isolation disconnecting link QS3 are connected on a parallel circuit of the soft starter and the frequency converter. The utility model can isolate the frequency converter for maintenance when the frequency converter fails by matching the line inlet and outlet contactor and the disconnecting link, and simultaneously is provided with the frequency converter and the soft start bypass, so that the frequency converter can be instantly put into operation when the frequency converter fails, the motor can be directly subjected to soft start through the bypass soft start, the starting current of the high-voltage motor during starting is limited, and in addition, after the frequency converter is overhauled, the load can be switched from the soft start bypass to the frequency converter for energy-saving operation.
Description
Technical Field
The utility model relates to the technical field of frequency converters, in particular to a high-voltage frequency converter switching controllable reactance bypass soft start system.
Background
In the whole electrical system, one more frequency converter is arranged, one more fault point is arranged, when the frequency converter fails, the fault frequency converter needs to be ensured to be cut off, the bypass operation is put into, the normal operation of process equipment is not influenced, and the following bypass modes are adopted: 1. and the frequency converter power unit bypasses, and the frequency converter automatically bypasses.
The principle of the power unit bypass is that each frequency converter is provided with one more power unit, and under the condition that the power unit of the frequency converter fails, the failed power unit is cut off and put into the bypass power unit. The advantages are less investment and no occupation of space outside the frequency converter. Meanwhile, the defects are obvious: for the situation that the frequency converter cannot operate except the power unit fault, the following situations cannot be dealt with, for example: the fan power supply and the control power supply of the frequency converter are disconnected, so that the frequency converter can only jump to a superior circuit breaker, and equipment is stopped.
The automatic bypass is relatively reliable, and when the frequency converter has any fault, the frequency converter can control the upper and lower contactors KM1, KM2 and KM3 to realize the mutual switching between power frequency and frequency conversion, and the detailed description is shown in the figure 2 of the specification. This solution has a drawback that when the frequency converter fails during operation in the low frequency band, switching to power frequency operation will cause a relatively large impact on the load equipment, which may lead to failure of the load motor. Meanwhile, because KM1-3 are all vacuum contactors, the maximum rated current is 400A, when the load click power is larger, the switching current in the switching process is larger than 400A in a short time, so that the contactors trip, and the bypass switching process fails.
The soft start mode of configuring the reactor for the frequency converter can be used for solving the problems, so that the high-voltage frequency converter switching controllable reactance bypass soft start system is provided.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model provides a high-voltage frequency converter switching controllable reactance bypass soft start system, which is used for isolating a frequency converter when the frequency converter fails by matching a line inlet and outlet contactor and a disconnecting link, meanwhile, the frequency converter and a soft start bypass are configured, the frequency converter can be instantly put into operation when the frequency converter fails, a motor can be directly subjected to soft start through the bypass soft start, the starting current of the high-voltage motor during starting is limited, and in addition, after the frequency converter is overhauled, the load can be switched from the soft start bypass to the frequency converter for energy-saving operation.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a controllable reactance bypass soft start system of high voltage inverter switching, includes converter and the soft start bypass of connecting between power and motor, converter and soft start bypass include the converter and with the parallelly connected soft starter of converter, be connected with bypass soft play inlet wire contactor KM2, bypass soft play inlet wire isolation switch QS2 and soft play bypass outlet wire isolation switch QS3 on the parallel line of soft starter and converter, and the parallelly connected soft play bypass contactor KM3 that has on the soft starter, instantaneous use of putting into operation when the converter trouble.
Preferably, the bypass soft-start wire isolating switch QS2 is connected to an input end of the soft starter, the bypass soft-start wire contactor KM2 is connected to an input end of the bypass soft-start wire isolating switch QS2, and the soft-start bypass wire isolating switch QS3 is connected to an output end of the soft starter.
Preferably, a parallel circuit of the frequency converter and the soft starter is connected with a frequency converter incoming line contactor KM1, a frequency converter incoming line isolation switch QS1, a frequency converter outgoing line isolation switch QS4 and a frequency converter outgoing line contactor KM4, and when the frequency converter fails, the frequency converter is isolated for maintenance.
Preferably, the incoming line isolation switch QS1 of the frequency converter is connected to the input end of the frequency converter, the incoming line contactor KM1 of the frequency converter is connected to the input end of the incoming line isolation switch QS1 of the frequency converter, the outgoing line isolation switch QS4 of the frequency converter is connected to the output end of the frequency converter, and the outgoing line contactor KM4 of the frequency converter is connected to the output end of the outgoing line isolation switch QS4 of the frequency converter.
Preferably, the frequency converter incoming line contactor KM1 and the bypass soft incoming line contactor KM2 are both connected to the output end of the power supply, and the soft outgoing line isolation disconnecting link QS3 and the frequency converter outgoing line contactor KM4 are both connected to the input end of the motor.
The utility model has the technical effects and advantages that:
1. the utility model can isolate the frequency converter for overhauling by matching the frequency converter with the line inlet and outlet contactor and the disconnecting link, and simultaneously, the frequency converter and the soft start bypass are configured, so that the frequency converter can be instantly put into operation when the frequency converter fails.
2. The utility model can also directly carry out soft start on the motor through bypass soft start, and limit the starting current when the high-voltage motor is started.
3. According to the utility model, after the overhaul of the frequency converter is completed, the load can be switched from the soft-start bypass to the frequency converter for energy-saving operation.
Drawings
FIG. 1 is a schematic diagram of an electrical system of the present utility model;
fig. 2 is a schematic diagram of a prior art electrical system.
The reference numerals are: 1. a frequency converter; 2. a soft starter; 3. a frequency converter incoming line contactor KM1; 4. the frequency converter is connected with a wire-incoming isolation disconnecting link QS1; 5. bypass soft start line contactor KM2; 6. bypass soft-start wire isolation knife switch QS2; 7. soft start bypass contactor KM3; 8. soft bypass outlet isolation knife switch QS3; 9. a frequency converter outgoing contactor KM4; 10. the outgoing line of the frequency converter isolates the disconnecting link QS4.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to the attached figure 1 of the specification, the utility model provides a high-voltage frequency converter switching controllable reactance bypass soft start system, which comprises a frequency converter and a soft start bypass, wherein the frequency converter and the soft start bypass are connected between a power supply and a motor, the frequency converter and the soft start bypass comprise a frequency converter 1 and a soft starter 2 connected with the frequency converter 1 in parallel, the soft start of the soft starter 2 has a self-checking function, equipment faults can be intelligently detected, dynamic monitoring is carried out according to a control program stored in the equipment in advance in the starting process of the motor, if faults occur, a fault signal can be automatically sent to a high-voltage wire inlet cabinet so as to cut off the power supply, further protect the motor and automatically lock the motor. The protection function of the equipment is complete, and the equipment has the advantages of reliable operation, stable performance, convenient debugging, simple operation and maintenance and the like. The equipment maintenance and the maintenance measures have no special requirements. Meanwhile, in the bypass switching process, soft start is interposed, and the current in the switching process can be controlled by setting starting current, so that the vacuum contactor is protected until the switching process is finished.
The parallel circuit of the soft starter 2 and the frequency converter 1 is connected with a bypass soft incoming line contactor KM25, a bypass soft incoming line isolation disconnecting link QS26 and a soft outgoing line isolation disconnecting link QS38, and the soft starter 2 is connected with a soft incoming line contactor KM37 in parallel, so that the frequency converter 1 is instantly put into use when in fault.
The bypass soft incoming line isolation disconnecting link QS26 is connected to the input end of the soft starter 2, the bypass soft incoming line contactor KM25 is connected to the input end of the bypass soft incoming line isolation disconnecting link QS26, and the soft outgoing line isolation disconnecting link QS38 is connected to the output end of the soft starter 2.
The parallel circuit of the frequency converter 1 and the soft starter 2 is connected with a frequency converter incoming line contactor KM13, a frequency converter incoming line isolation switch QS14, a frequency converter outgoing line isolation switch QS410 and a frequency converter outgoing line contactor KM49, when the frequency converter 1 breaks down, the frequency converter 1 is isolated for maintenance, the frequency converter incoming line isolation switch QS14 is connected to the input end of the frequency converter 1, the frequency converter incoming line contactor KM13 is connected to the input end of the frequency converter incoming line isolation switch QS14, the frequency converter outgoing line isolation switch QS410 is connected to the output end of the frequency converter 1, and the frequency converter outgoing line contactor KM49 is connected to the output end of the frequency converter outgoing line isolation switch QS 410.
The frequency converter incoming line contactor KM13 and the bypass soft-lifting incoming line contactor KM25 are both connected to the output end of a power supply, and the soft-lifting bypass outgoing line isolation disconnecting link QS38 and the frequency converter outgoing line contactor KM49 are both connected to the input end of a motor.
On the basis of automatic bypass, a soft starter 2 is added in the bypass, and the impact on a load motor during variable frequency cutting frequency is reduced through the soft starter 2. At ordinary times, the upper and lower-stage contactor frequency converter inlet wire contactor KM13 and the bypass soft-lifting inlet wire contactor KM25 of the up-converter 1 are disconnected from the soft-lifting bypass contactor KM37, so that the frequency converter 1 is put into operation, and the soft starter 2 does not participate in operation, so that no loss is caused.
When the frequency converter 1 breaks down, the frequency converter 1 cuts off the frequency converter 1 which breaks down through the frequency converter inlet wire contactor KM13 and the bypass soft lifting inlet wire contactor KM25, closes the soft lifting bypass contactor KM37, inputs the soft starter 2, limits the impact caused by switching to damage load equipment, and completes the whole frequency conversion switching power frequency process for a short time.
In addition, the bypass reactance soft start system has a special application environment: the high-voltage load carried by the frequency converter 1 is usually thousands or even thousands of kilowatts, and the starting current of the load is large, if a conventional direct starting scheme is adopted, the upper-level switch can be tripped, and at the moment, the frequency converter 1 has the energy-saving effect and also has the effect of a soft starter 2. When the fault of the frequency converter 1 is not overhauled, the technological equipment can be started, and at the moment, the soft start function can be switched to a bypass by switching off the frequency converter inlet wire contactor KM13 and the bypass soft start inlet wire contactor KM25, and closing the soft start bypass contactor KM 37. After the switching is completed, the load is operated at the power frequency through a soft start internal frequency converter outlet contactor KM 49. Meanwhile, as the frequency converter inlet wire contactor KM13 and the bypass soft lifting inlet wire contactor KM25 are disconnected, the frequency converter 1 can be maintained, after maintenance is completed, the bypass soft lifting inlet wire isolation knife switch QS26 and the frequency converter outlet wire contactor KM49 are disconnected through the frequency converter inlet wire contactor KM13 and the bypass soft lifting inlet wire contactor KM25, and the load is switched to variable frequency operation, so that the effects of process adjustment and energy saving are achieved.
Finally: the foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (5)
1. A high-voltage frequency converter switching controllable reactance bypass soft start system is characterized in that: the motor comprises a frequency converter and a soft start bypass, wherein the frequency converter is connected between a power supply and a motor;
the frequency converter and the soft start bypass comprise a frequency converter (1) and a soft starter (2) connected with the frequency converter (1) in parallel, a bypass soft start wire inlet contactor KM2 (5), a bypass soft start wire inlet isolation disconnecting link QS2 (6) and a soft start bypass wire outlet isolation disconnecting link QS3 (8) are connected to a parallel circuit of the soft starter (2) and the frequency converter (1), and the frequency converter (1) is instantly put into use when in fault.
2. A high voltage inverter switching controllable reactance bypass soft start system according to claim 1, characterized in that: the bypass soft incoming line isolation disconnecting link QS2 (6) is connected to the input end of the soft starter (2), the bypass soft incoming line contactor KM2 (5) is connected to the input end of the bypass soft incoming line isolation disconnecting link QS2 (6), and the soft outgoing line isolation disconnecting link QS3 (8) is connected to the output end of the soft starter (2).
3. A high voltage inverter switching controllable reactance bypass soft start system according to claim 1, characterized in that: the parallel circuit of the frequency converter (1) and the soft starter (2) is connected with a frequency converter incoming line contactor KM1 (3), a frequency converter incoming line isolation switch QS1 (4), a frequency converter outgoing line isolation switch QS4 (10) and a frequency converter outgoing line contactor KM4 (9), and the frequency converter (1) is isolated for overhauling when the frequency converter (1) breaks down.
4. A high voltage inverter switching controllable reactance bypass soft start system according to claim 3, characterized in that: the frequency converter wire inlet isolation disconnecting link QS1 (4) is connected to the input end of the frequency converter (1), the frequency converter wire inlet contactor KM1 (3) is connected to the input end of the frequency converter wire inlet isolation disconnecting link QS1 (4), the frequency converter wire outlet isolation disconnecting link QS4 (10) is connected to the output end of the frequency converter (1), and the frequency converter wire outlet contactor KM4 (9) is connected to the output end of the frequency converter wire outlet isolation disconnecting link QS4 (10).
5. The high voltage inverter switching controllable reactance bypass soft start system of claim 4, characterized by: the frequency converter incoming line contactor KM1 (3) and the bypass soft incoming line contactor KM2 (5) are both connected to the output end of a power supply, and the soft outgoing line isolation disconnecting link QS3 (8) and the frequency converter outgoing line contactor KM4 (9) are both connected to the input end of a motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321122283.8U CN219740231U (en) | 2023-05-10 | 2023-05-10 | High-voltage frequency converter switching controllable reactance bypass soft start system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321122283.8U CN219740231U (en) | 2023-05-10 | 2023-05-10 | High-voltage frequency converter switching controllable reactance bypass soft start system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219740231U true CN219740231U (en) | 2023-09-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321122283.8U Active CN219740231U (en) | 2023-05-10 | 2023-05-10 | High-voltage frequency converter switching controllable reactance bypass soft start system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219740231U (en) |
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2023
- 2023-05-10 CN CN202321122283.8U patent/CN219740231U/en active Active
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