CN101860285A - Autotransformer device and starting method for soft start of high-power motor - Google Patents
Autotransformer device and starting method for soft start of high-power motor Download PDFInfo
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- CN101860285A CN101860285A CN 201010167510 CN201010167510A CN101860285A CN 101860285 A CN101860285 A CN 101860285A CN 201010167510 CN201010167510 CN 201010167510 CN 201010167510 A CN201010167510 A CN 201010167510A CN 101860285 A CN101860285 A CN 101860285A
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- autotransformer
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- circuit breaker
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Abstract
The invention discloses an autotransformer device and a starting method for the soft start of a high-power motor. The autotransformer device comprises a winding, wherein a starting end of the winding is connected with a voltage bus through a first circuit breaker and is simultaneously connected with a motor through a second circuit breaker; a tap is drawn out of the winding and is connected with the motor; a plurality of tapping points are drawn out of a rear segment of the winding; the plurality of tapping points are connected with a third circuit breaker through a multi-path selector switch; and the third circuit breaker is connected with a three-phase winding. The autotransformer device has the advantages of avoiding power failure and continuously boosted end voltage of the high-power motor in the whole starting process which is usually known as a soft start mode, so that a stable and quick start-up of the motor is realized, and the impact on current of a grid system is reduced to the minimum.
Description
Technical field
The present invention relates to a kind of high-power electric drive train may starting equipment, especially relate to a kind of autotransformer device and starting method that is used for soft start of high-power motor.
Background technology
Heavy-duty motor will produce bigger impulse current when direct-on-line starting, it is 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, the safe operation of impulse current even harm electrical network; Because a dynamic stress is bigger, reduced the useful life of load equipment simultaneously.
The transformer that present caused by big motor starting up is used is generally the fixing autotransformer of tap, 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 at all.Owing to the existence of these reasons, limited the application of autotransformer in big motor (high-power electric drive system) starting.
Autotransformer as shown in Figure 1 is more common a kind of, the concrete course of work is as follows: the circuit breaker Q of closing earlier F3, make three phase winding tail end short circuits of autotransformer, the circuit breaker Q of closing subsequently F1, make busbar voltage deliver to autotransformer, by delivering to motor after the autotransformer step-down, motor begins starting.When current of electric drops to set point or rotating speed reaches the setting rotating speed, circuit breaker Q F3 disconnects, and autotransformer is reactor running status (about 1 second), and the circuit breaker Q of closing again F2 send full voltage to voltage end, and electric motor starting is finished, 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, therefore needs repeatedly to regulate under the off-position tap of autotransformer in starting process.Heavy-duty motor often cuts off the power supply in starting process and has following harm: when switch disconnected, the motor outage when closing a floodgate again, because there are phase angle difference in winding back emf and system voltage, can cause very big impulse current.
Summary of the invention
Technical problem to be solved by this invention provides a kind of autotransformer device that is used for soft start of high-power motor and starting method of not cutting off the power supply in starting process.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of autotransformer device that is used for soft start of high-power motor, comprise winding, the initiating terminal of winding is connected with voltage bus by first circuit breaker, the initiating terminal of winding is connected with motor by second circuit breaker simultaneously, drawing a tap in the winding is connected with motor, the back segment of winding is drawn a plurality of taps, described a plurality of tap is connected with the 3rd circuit breaker by multidiameter option switch, and described the 3rd circuit breaker is connected with three phase windings.
A kind of starting method of heavy-duty motor is characterized in that it specifically may further comprise the steps: (1), multidiameter option switch and first tap close;
(2), the 3rd circuit breaker that closes, make autotransformer three phase winding tail end short circuits, and link to each other with generator neutral point;
(3), first circuit breaker is closed, busbar voltage is delivered to autotransformer;
(4), after operation a period of time, with the disconnection of multidiameter option switch and first tap, autotransformer is the reactor running status, the duration is approximately 1-5mS;
(5), multidiameter option switch and second tap are closed, recover the autotransformer running status, compare the terminal voltage that has improved motor when first tap closes;
(6), gradually multidiameter option switch is incorporated into N tap joint position, it is the highest that motor terminal voltage is increased to gradually;
(7), current of electric drops to set point or rotating speed reaches the setting rotating speed, and the 3rd circuit breaker Q F3 is disconnected, autotransformer is the reactor running status;
(8), second circuit breaker that closes, send full voltage to motor side, starting is finished, autotransformer is out of service.
Compared with prior art, advantage of the present invention is that heavy-duty motor does not cut off the power supply in whole starting process and constantly improves the terminal voltage of motor, usually this process is called soft-start mode, steadily and apace starts to reach motor, and the rush of current of electrical network is reduced to minimum.
Distance is distant between autotransformer of the prior art and the big motor, and its electrical connection each other connects by high-tension cable, and the multidiameter option switch among the present invention is directly to be connected on the autotransformer, has reduced cost.
Switching current required for the present invention is compared with switching current of the prior art, and its electric current is very little, has only 25～50% of traditional autotransformer switching current, and its switching voltage is lower, so price is lower on the engineering, better reliability.
Description of drawings
Fig. 1 is a structural representation of the prior art;
Fig. 2 is a structural representation of the present invention.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
A kind of autotransformer device that is used for soft start of high-power motor, comprise winding, the initiating terminal A of winding R is connected with voltage bus U by the first circuit breaker Q F1, the initiating terminal A of winding R is connected with motor M by the second circuit breaker Q F2 simultaneously, drawing a tap C among the winding R is connected with motor M, the back segment of winding R draw N tap J1, J2 ... JN, N tap is connected with the 3rd circuit breaker Q F3 by multidiameter option switch K, and the 3rd circuit breaker Q F3 is connected with three phase winding Z.
A kind of starting method of heavy-duty motor, it specifically may further comprise the steps: multidiameter option switch K and first tap J1 close, the 3rd circuit breaker Q F3 again closes, make autotransformer three phase winding Z tail end short circuits, and link to each other, close with being about to the first circuit breaker Q F1 in generator neutral point, busbar voltage U delivers to autotransformer, this moment autotransformer the secondary voltage minimum, system's starting current minimum is impacted less to electrical network.After operation a period of time, multidiameter option switch K and first tap J1 are disconnected, this moment, common winding partly was equivalent to an inductance, and autotransformer is the reactor running status, and the duration is approximately 1-5mS, not power down of motor side.Subsequently multidiameter option switch K and second tap J2 are closed, make system restoration autotransformer running status, and improved the terminal voltage of motor when comparing first tap J1, make the multidiameter option switch K of transformer change to N tap JN position so gradually from first tap J1, make motor terminal voltage gradually from minimum to the highest, electric moter voltage steadily rises in the whole starting process thereby make, and has shortened the electric motor starting time, and can determine to start successfully.When multidiameter option switch closed in the JN position, it is the highest that motor terminal voltage is increased to gradually.Current of electric drops to set point or rotating speed reaches the setting rotating speed, and the 3rd circuit breaker Q F3 disconnects, and autotransformer is reactor running status (an about second), the second circuit breaker Q F2 again closes, send full voltage to motor side, starting is finished, and autotransformer is out of service.
Claims (2)
1. autotransformer device that is used for soft start of high-power motor, comprise winding, the initiating terminal of winding is connected with voltage bus by first circuit breaker, the initiating terminal of winding is connected with motor by second circuit breaker simultaneously, it is characterized in that drawing in the winding tap is connected with motor, the back segment of winding is drawn a plurality of taps, and described a plurality of taps are connected with the 3rd circuit breaker by multidiameter option switch, and described the 3rd circuit breaker is connected with three phase windings.
2. the starting method of a heavy-duty motor is characterized in that it specifically may further comprise the steps: (1), multidiameter option switch and first tap close;
(2), the 3rd circuit breaker that closes, make autotransformer three phase winding tail end short circuits, and link to each other with generator neutral point;
(3), first circuit breaker is closed, busbar voltage is delivered to autotransformer;
(4), after system operation a period of time, with multidiameter option switch and the disconnection of first tap, autotransformer is the reactor running status, the duration is approximately 1-5mS;
(5), multidiameter option switch and second tap are closed, recover the autotransformer running status, compare the terminal voltage that has improved motor when first tap closes;
(6), gradually multidiameter option switch is incorporated into N tap joint position, it is the highest that motor terminal voltage is increased to gradually;
(7), current of electric drops to set point or rotating speed reaches the setting rotating speed, and the 3rd circuit breaker Q F3 is disconnected, autotransformer is the reactor running status;
(8), second circuit breaker that closes, send full voltage to motor side, starting is finished, autotransformer is out of service.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010167510 CN101860285A (en) | 2010-05-11 | 2010-05-11 | Autotransformer device and starting method for soft start of high-power motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010167510 CN101860285A (en) | 2010-05-11 | 2010-05-11 | Autotransformer device and starting method for soft start of high-power motor |
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| Publication Number | Publication Date |
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| CN101860285A true CN101860285A (en) | 2010-10-13 |
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| CN 201010167510 Pending CN101860285A (en) | 2010-05-11 | 2010-05-11 | Autotransformer device and starting method for soft start of high-power motor |
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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 |
| CN103312235A (en) * | 2013-06-08 | 2013-09-18 | 田安振 | Composite self-coupling buck energy-saving soft starter |
| CN109450296A (en) * | 2018-11-07 | 2019-03-08 | 大禹电气科技股份有限公司 | Process boost type auto-transformer starting device and starting method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2164613Y (en) * | 1993-09-09 | 1994-05-11 | 重庆大学 | Mixing voltage-regulating start controller for ac motor |
| WO2006034977A1 (en) * | 2004-09-28 | 2006-04-06 | Siemens Aktiengesellschaft | Method for determining and setting parameters for an electronic motor controller and corresponding self-parameterising antiductor in particular a soft starter |
| CN2817207Y (en) * | 2005-01-24 | 2006-09-13 | 哈尔滨世纪旌旗科技有限责任公司 | AC magnetic control type motor soft start device |
| CN101651439A (en) * | 2009-05-05 | 2010-02-17 | 哈尔滨帕特尔科技有限公司 | Switch autotransformer type intermediate and high voltage motor soft start device |
-
2010
- 2010-05-11 CN CN 201010167510 patent/CN101860285A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2164613Y (en) * | 1993-09-09 | 1994-05-11 | 重庆大学 | Mixing voltage-regulating start controller for ac motor |
| WO2006034977A1 (en) * | 2004-09-28 | 2006-04-06 | Siemens Aktiengesellschaft | Method for determining and setting parameters for an electronic motor controller and corresponding self-parameterising antiductor in particular a soft starter |
| CN2817207Y (en) * | 2005-01-24 | 2006-09-13 | 哈尔滨世纪旌旗科技有限责任公司 | AC magnetic control type motor soft start device |
| CN101651439A (en) * | 2009-05-05 | 2010-02-17 | 哈尔滨帕特尔科技有限公司 | Switch autotransformer type intermediate and high voltage motor soft start device |
Cited By (4)
| 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 |
| CN103312235A (en) * | 2013-06-08 | 2013-09-18 | 田安振 | Composite self-coupling buck energy-saving soft starter |
| CN103312235B (en) * | 2013-06-08 | 2016-03-30 | 田安振 | A kind of compound self-coupling voltage reducing economize on electricity soft initiator |
| CN109450296A (en) * | 2018-11-07 | 2019-03-08 | 大禹电气科技股份有限公司 | Process boost type auto-transformer starting device and starting method |
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Open date: 20101013 |