CN202617050U - High-power motor soft-starting adjustable autotransformer device - Google Patents
High-power motor soft-starting adjustable autotransformer device Download PDFInfo
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- CN202617050U CN202617050U CN 201220277343 CN201220277343U CN202617050U CN 202617050 U CN202617050 U CN 202617050U CN 201220277343 CN201220277343 CN 201220277343 CN 201220277343 U CN201220277343 U CN 201220277343U CN 202617050 U CN202617050 U CN 202617050U
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- autotransformer
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Abstract
The utility model discloses a high-power motor soft-starting adjustable autotransformer device which comprises a winding, wherein a start end of the winding is connected to a voltage bus through a first disconnector and connected to a motor through a second disconnector. A plurality of taps are drawn from the winding, wherein one tap is connected to the motor. The high-power motor soft-starting adjustable autotransformer device is characterized by further comprising at least one adjusting winding conjugated with the winding, a tail end of the winding is connected to a start end of the adjusting winding, a tail end of the adjusting winding is connected to a three-phase winding through a third disconnector, and an option switch is arranged between the start end and the tail end of the adjusting winding in a connecting mode. Compared with a secondary current of an existing autotransformer, a secondary current of the high-power motor soft-starting adjustable autotransformer device is smaller, has a lower effect on a power grid, is low in secondary voltage, has a low effect on a loading device, and prolongs service life of the loading device.
Description
Technical field
The present invention relates to a kind of soft start of high-power motor device, especially a kind of soft starter device that adopts variable autotransformer, and a kind of soft start of high-power motor method of using this autotransformer.
Background technology
The heavy-duty motor of power more than 8000W, it can produce bigger impulse current when direct-on-line starting, be generally 5-8 times of rated current Ie.The capacity of motor is big more, and the impulse current that is produced during starting is just big more to electrical network and load shock thereof.When the capacity of motor is excessive, impulse current even the safe operation that can endanger electrical network; Because a dynamic stress is bigger, make the useful life of load equipment lower simultaneously.
Heavy-duty motor works the transformer of employing and is generally the fixing autotransformer of tap at present, and in whole motor starting process, the tap of autotransformer is immutable.In order to reduce heavy-duty motor impact to electrical network when starting, just must use the autotransformer of low pressure tap, but the autotransformer of low pressure tap can make the electric motor starting time lengthening, even motor can't be started.Owing to the existence of these reasons, limited the application of autotransformer in the heavy-duty motor starting.
Autotransformer as shown in Figure 1 is more common a kind of, and the concrete course of work is following: the circuit breaker Q of closing earlier F
3', make three phase winding tail end short circuits of autotransformer, the circuit breaker Q of closing subsequently F
1', make busbar voltage deliver to autotransformer, through delivering to motor after the autotransformer step-down, motor begins starting.When current of electric drops to set point or rotating speed reaches setting rotating speed, circuit breaker Q F
3' break off, autotransformer is reactor running status (about 1 second), the circuit breaker Q of closing again F
2', send full voltage to voltage end, electric motor starting is accomplished, and autotransformer is out of service.
There is following shortcoming in this autotransformer: starting each time can only be fixed one of them tap that uses in the autotransformer; Owing to have a plurality of taps 1 ', 2 ', 3 ', therefore in starting process, need repeatedly to regulate under the off-position tap of autotransformer.Heavy-duty motor often cuts off the power supply in starting process and has following harm: when switch broke off, motor broke off, and when switch closes again, because there are phase angle difference in winding back emf and system voltage, can cause very big impulse current.
Summary of the invention
It is little that first technical problem to be solved by this invention provides a kind of impulse current, and little to electrical network harm, the soft start of high-power motor that service life of equipment is long is used the variable autotransformer device.
Second technical problem to be solved by this invention provides a kind of soft-starting method of heavy-duty motor.
The present invention solves the technical scheme that above-mentioned first technical problem adopts: a kind of soft start of high-power motor is used the variable autotransformer device; Comprise winding; The initiating terminal of said winding is connected to voltage bus through first circuit breaker, and is connected to motor through second circuit breaker, draws a plurality of taps in the said winding; One of them tap is connected to said motor; It is characterized in that also comprise the adjusting winding of at least one and said winding conjugation, the end of said winding is connected to the initiating terminal of regulating winding; The end of said adjusting winding is connected to three phase windings through the 3rd circuit breaker, is connected with selector switch between the initiating terminal of said adjusting winding and the end.
Wherein, when said adjusting winding when being a plurality of, each is regulated, and series connection is provided with between winding.
The present invention solves above-mentioned second technical scheme that technical problem adopted: a kind of soft start of high-power motor method, adopt above-mentioned variable autotransformer device, and may further comprise the steps:
1) said selector switch is closed, this moment said adjusting short circuit in winding, autotransformer device is low no-load voltage ratio, secondary voltage is low;
2) said the 3rd circuit breaker is closed, make said three phase winding tail end short circuits; Said first circuit breaker that closes immediately, said voltage bus send electric energy to autotransformer;
3) detect said rotating speed of motor or electric current, when after after a while, during first rotating speed that said motor quickens to reach preset, said selector switch is opened, in the said adjusting winding line attachment, autotransformer device is the hypermutation ratio, the secondary voltage increase;
4) again after after a while, during second rotating speed that said motor quickens to reach preset, said the 3rd circuit breaker to be opened, autotransformer is reactor and moves 1 ~ 5s.
5) said second circuit breaker is closed, said motor switches to operation under the full voltage, and autotransformer is out of service, and starting is accomplished.
Wherein, in step 3), when said adjusting winding is a plurality of series connection, open the number of said selector switch as required.
Compared with prior art; The invention has the advantages that: the secondary current of existing relatively autotransformer, secondary pulse electric current of the present invention is less, and the secondary current of comparable existing autotransformer reduces 20 ~ 30% usually; Influence to electrical network is less; Secondary voltage is low, and is also less to the influence of load equipment, prolongs its useful life.
Description of drawings
Fig. 1 is the autotransformer sketch map of prior art;
Fig. 2 is an autotransformer sketch map of the present invention;
Fig. 3 is the winding sketch map of autotransformer of the present invention.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Referring to Fig. 2 and Fig. 3, a kind of soft start of high-power motor is used the variable autotransformer device, comprises winding R1, and the initiating terminal A of winding R1 is through the first circuit breaker Q F
1Be connected to voltage bus, in addition, also through the second circuit breaker Q F
2Be connected to motor M.Drawing a plurality of taps among the winding R1, in the present embodiment, is three, first tap 1, second tap 2 and the 3rd tap 3, and one of them tap is connected to motor M.
The terminal X of winding R1 is connected to an initiating terminal A ' who regulates winding R2, and the terminal X ' that regulates winding R2 is through the 3rd circuit breaker Q F
3Be connected to three phase winding Z.Regulate winding R2 and winding R1 conjugation, be connected with selector switch KF between its initiating terminal A ' and the terminal X '.
Regulating winding R2 also can be for a plurality of, and each is regulated, and series connection is provided with between the winding R2.
Adopt the step of above-mentioned variable autotransformer device starting heavy-duty motor to be:
1) the selector switch KF that at first closes regulates winding R2 short circuit, and this moment, autotransformer was low no-load voltage ratio, and secondary voltage is low, and starting current is little, and primary current is littler;
2) then, with the 3rd circuit breaker Q F
3Close by (0 switch), make three phase winding Z tail end short circuits of autotransformer become 0 point, be Ya0 and connect method; The first circuit breaker Q F immediately closes
3(mains switch), voltage bus send electric energy to autotransformer, energized of autotransformer this moment, and motor M begins starting under low-voltage, and system flows down starting in small electric, impacts less to electrical network.
3) rotating speed or the electric current of detection motor M; When after after a while, during first rotating speed that motor M is quickened to reach preset, KF opens with selector switch; Regulate in the winding R2 line attachment; Wherein first rotating speed is to decide according to the starting curve characteristics of motor, and usually, first rotating speed is 50 ~ 90% of the rotating speed that moves under the motor M total head; When adjusting winding R2 is a plurality of series connection, can open the number of selector switch KF as required, regulate the autotransformer no-load voltage ratio, this moment, autotransformer was the hypermutation ratio, and secondary voltage improves, and the motor M electric current increases.
4) again after after a while, motor M quickens to reach the second preset rotating speed, and usually, second rotating speed is 90 ~ 96% of the rotating speed that moves under the motor M total head; With the 3rd circuit breaker Q F
3Open, promptly open 0 switch, this moment, the winding R1 of autotransformer was serially connected in the loop of motor M stator and voltage bus, and autotransformer is the reactor running status.This transition stage is lasted 1 ~ 5s, and after this starting current is reduced near rated current.
5) with the second circuit breaker Q F
2Close, motor M switches to operation under the full voltage, and autotransformer is out of service, and starting is accomplished.
Wherein, in step 3) and 4) in, open selector switch KF, the 3rd circuit breaker Q F
3Time also can select according to the current value of motor M.
The above is merely preferred implementation of the present invention, should be pointed out that for those of ordinary skill in the art, not breaking away under the principle prerequisite of the present invention, can also make various deformation and improvement, and this also should be regarded as protection scope of the present invention.
Claims (2)
1. a soft start of high-power motor is used the variable autotransformer device, comprises winding (R1), and the initiating terminal (A) of said winding (R1) is through the first circuit breaker (QF
1) be connected to voltage bus, and through the second circuit breaker (QF
2) be connected to motor (M); Draw a plurality of taps in the said winding (R1); One of them tap is connected to said motor (M), it is characterized in that, also comprises the adjusting winding (R2) of at least one and said winding (R1) conjugation; The end (X) of said winding (R1) is connected to the initiating terminal of regulating winding (R2) (A '), and the end of said adjusting winding (R2) (X ') through the 3rd circuit breaker (QF
3) be connected to three phase windings (Z), be connected with selector switch (KF) between the initiating terminal of said adjusting winding (R2) (A ') and terminal (X ').
2. variable autotransformer device as claimed in claim 1 is characterized in that, said adjusting winding (R2) is a plurality of and mutual series connection setting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220277343 CN202617050U (en) | 2012-06-08 | 2012-06-08 | High-power motor soft-starting adjustable autotransformer device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220277343 CN202617050U (en) | 2012-06-08 | 2012-06-08 | High-power motor soft-starting adjustable autotransformer device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202617050U true CN202617050U (en) | 2012-12-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220277343 Expired - Fee Related CN202617050U (en) | 2012-06-08 | 2012-06-08 | High-power motor soft-starting adjustable autotransformer device |
Country Status (1)
| Country | Link |
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| CN (1) | CN202617050U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694487A (en) * | 2012-06-08 | 2012-09-26 | 宁波高新区宁变电力设备有限公司 | Adjustable self-coupling transformer device and starting method for soft starting of high-power motor |
| JP2019152123A (en) * | 2018-03-01 | 2019-09-12 | フルタ電機株式会社 | Air blower and air blowing system |
-
2012
- 2012-06-08 CN CN 201220277343 patent/CN202617050U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694487A (en) * | 2012-06-08 | 2012-09-26 | 宁波高新区宁变电力设备有限公司 | Adjustable self-coupling transformer device and starting method for soft starting of high-power motor |
| JP2019152123A (en) * | 2018-03-01 | 2019-09-12 | フルタ電機株式会社 | Air blower and air blowing system |
| JP6995355B2 (en) | 2018-03-01 | 2022-01-14 | フルタ電機株式会社 | Blower system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: NINGBO NINGBIAN POWER SCI-TECH CO., LTD. Free format text: FORMER NAME: NINGBO HI-TECH ZONE NINGBIAN ELECTRIC POWER EQUIPMENT CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 315040 Zhejiang city of Ningbo province high tech Zone Jinghua Road No. 168 Patentee after: Ningbo Ningbian Power Sci-Tech Co., Ltd. Address before: 315040 Zhejiang city of Ningbo province high tech Zone Jinghua Road No. 168 Patentee before: Ningbo High-tech Zone Ningbian Electricity Equipment Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121219 Termination date: 20160608 |