CN104009676A - Adjustable capacitance type autotransformer device for large-motor starting - Google Patents
Adjustable capacitance type autotransformer device for large-motor starting Download PDFInfo
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- CN104009676A CN104009676A CN201410262595.8A CN201410262595A CN104009676A CN 104009676 A CN104009676 A CN 104009676A CN 201410262595 A CN201410262595 A CN 201410262595A CN 104009676 A CN104009676 A CN 104009676A
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- 238000004804 winding Methods 0.000 claims abstract description 42
- 239000003990 capacitor Substances 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000021615 conjugation Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
The invention relates to a high-power motor soft starting device, in particular to an adjustable capacitance type autotransformer device for large-motor starting. The adjustable capacitance type autotransformer for large-motor starting comprises a winding. The winding is connected with a voltage bus through a first circuit breaker. A plurality of taps are arranged on the winding. One tap is connected with a motor. A second circuit breaker is arranged between the first circuit breaker and the motor. The winding is further connected with an adjusting device. The adjusting device comprises at least one adjustable capacitor, wherein the capacitors are connected in series. The adjusting device is connected with a three-phase winding through a third circuit breaker. A selector switch is arranged on the adjusting device. Compared with the prior art, when the adjustable capacitance type autotransformer device operates, impact currents are small, the damage to a power grid is small, the service life is long, and the adjustable capacitance type autotransformer device further has the advantages that the size is small, weight is low, the adjusting device can be detached, the device is more convenient to carry, the application range is wider, and the startable power range of the motor is wider.
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 method of using the soft start of high-power motor of this autotransformer.
Background technology
The heavy-duty motor of power more than 8000W, it can produce larger impulse current when direct-on-line starting, is generally the 5-8 of rated current Ie doubly.The capacity of motor is larger, and the impulse current producing during starting is just larger to electrical network and load shock thereof.When the capacity of motor is excessive, impulse current even can endanger the safe operation of electrical network; Simultaneously larger owing to playing dynamic stress, make the useful life of load equipment lower.The heavy-duty motor of most works the transformer of employing and 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 electric motor starting time lengthening, even makes motor start.Due to the existence of these reasons, limited the application of autotransformer in heavy-duty motor starting.
The applicant had previously applied for patent of invention " variable autotransformer device and starting method for soft start of high-power motor " (application number: 201210194470.7) for this reason, by connecting on winding, one or more adjusting winding that can regulate can start heavy-duty motor the not power-off in the situation that, the secondary current of relatively existing autotransformer, the secondary pulse electric current of this invention is less, conventionally the secondary current of comparable existing autotransformer reduces 20 ~ 30%, impact on electrical network is less, secondary voltage is low, impact on load equipment is also less, extend its useful life.But the complex structure of this variable autotransformer device, especially winding and adjusting winding conjugation, make bulky of the present invention, and overall weight has reached 7 to 9 tons, mobile very difficult, very inconvenient during use.
Summary of the invention
The present invention is directed to deficiency of the prior art, a kind of adjustable capacitance type autotransformer device for caused by big motor starting up is provided, during the operation of this device, impulse current is little, low to electrical network harm, long service life, also there is small volume simultaneously, weight is lighter, and the dismountable feature of adjusting device makes the carrying of this device convenient, the scope of application is more extensive, and the power of motor scope that can start is larger.
In order to solve the problems of the technologies described above, the present invention is solved by following technical proposals: a kind of adjustable capacitance type autotransformer device for caused by big motor starting up, comprise winding, described winding connects voltage bus by first circuit breaker, on described winding, be provided with several taps, tap described in one of them connects motor, between described first circuit breaker and described motor, be provided with second circuit breaker, described winding is also connected with adjusting device, described adjusting device comprises that series connection arranges at least one adjustable capacitor, described adjusting device connects three phase windings by the third described circuit breaker, in described adjusting device, be provided with selector switch.
In technique scheme, preferred, in described adjusting device, be also provided with first link and second link, the winding described in the described dismountable connection of first link, three phase windings described in the described dismountable connection of second link.
In technique scheme, preferred, described selector switch is arranged in described adjusting device adjustable capacitor two ends described in each.
Arrange like this, feature of the present invention is that fixedly winding and the adjusting device series connection in autotransformer device arranges, adjusting device comprises the capacitor that at least one is adjustable, adjustable capacitor and winding do not need to be arranged on same iron yoke, adjusting device can be dismantled with respect to autotransformer device, reduce greatly volume and the weight of whole autotransformer device, alleviated greatly the difficulty of transportation simultaneously.Moreover, with respect to need to the adjusting winding of winding conjugation, adjusting device of the present invention is that several adjustable capacitor's seriess form, the selection of the scope of adjusting is more flexible than the regulating winding of winding type, adjustable scope is also more extensive.
A soft start of high-power motor method, is characterized in that, comprises following step, steps A: the described selector switch on all described adjustable capacitors is closed, now described adjusting device short circuit, autotransformer device is low no-load voltage ratio, and secondary voltage is low; Step B: the third described circuit breaker is closed, described adjusting device is connected with three described phase windings, the more described first circuit breaker that closes, allow described voltage bus power transmission to described autotransformer device; Step C: the rotating speed or the electric current that detect described motor, when through after a period of time, when described motor accelerates to the first default rotating speed, described selector switch is opened, allow in described adjusting device line attachment, regulate gradually the current potential of described adjustable capacitor, change the inductance of described adjustable capacitor, make autotransformer device be hypermutation ratio, secondary voltage increases; Step D: again through after a period of time, during the second rotating speed that described motor accelerates to reach default, described the third circuit breaker is opened, made described autotransformer device be reactor and move 1 ~ 10 second; Step e: described second circuit breaker is closed, and described motor switches to full voltage operation, and described autotransformer device is out of service, and starting completes.
Compared with prior art, the invention has the beneficial effects as follows: during the operation of this device, impulse current is little, low to electrical network harm, long service life also has small volume simultaneously, and weight is lighter, the dismountable feature of adjusting device, make the carrying of this device convenient, the scope of application is more extensive, and the power of motor scope that can start is larger.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
As shown in Figure 1, a kind of adjustable capacitance type autotransformer device for caused by big motor starting up, comprises winding R, winding R connects voltage bus by first circuit breaker Q F1, on winding R, be provided with three taps, three taps are respectively first plugs 1, second plug 2 and the third plug 3.One of them tap connects motor M, voltage bus connects motor M by second circuit breaker Q F2, and second circuit breaker Q F2 is between first circuit breaker Q F1 and motor M, and winding R is also connected with adjusting device, adjusting device comprises an adjustable capacitor C, and capacitor C two ends are provided with selector switch KF.Adjusting device connects three phase winding Z by the third circuit breaker Q F3, is also provided with first link X and second link Y in adjusting device, the dismountable connection winding of first link X R, the dismountable connection three phase winding Z of second link Y.
During use, first, according to power selection access first plug 1, second plug 2 or third plug 3 of motor M, the reactance value between each plug differs 5%.The selector switch KF that closes again, allows adjustable capacitor C short circuit, and now autotransformer is low no-load voltage ratio, and secondary voltage is low, and starting current is little, and primary current is less.Then the third circuit breaker Q F3 is closed, three phase winding Z of autotransformer are joined, the first of closing immediately circuit breaker Q F1, make the voltage bus power transmission can be to autotransformer, now autotransformer once switches on power, motor M starts starting under low-voltage, and system flows down starting in small electric, to electrical network, impacts less.Then detect again rotating speed or the electric current of motor M, when through after a period of time, during the first rotating speed that motor M is accelerated to reach default, selector switch KF is opened, allow in adjustable capacitor C line attachment, then regulate the current potential of adjustable capacitor C, change the inductance of adjustable capacitor C.Wherein the first rotating speed is to determine according to the starting curve feature of motor, and conventionally, the first rotating speed is 50 ~ 90% of the rotating speed that moves under motor M total head; When adjustable capacitor C is a plurality of series connection, can open as required the number of selector switch KF.By regulating adjustable capacitor C to change autotransformer no-load voltage ratio, now autotransformer is hypermutation ratio, and secondary voltage improves, motor M electric current increases, adjustable capacitor C not only can regulate secondary voltage, and can play the compensating action of power factor, makes primary current lower.Again through after a period of time, motor M accelerates to reach the second default rotating speed, and conventionally, the second rotating speed is 90 ~ 96% of the rotating speed that moves under motor M total head; The third circuit breaker Q F3 is opened, and now the winding R of autotransformer is serially connected in the loop of motor M stator and voltage bus, and autotransformer is reactor running status.This transition stage is lasted 1 ~ 10s, and after this starting current has been down to and has been approached rated current.Second circuit breaker Q F2 is closed, and motor M switches under full voltage and moves, and autotransformer is out of service, and starting completes.
Apparatus of the present invention can also make the adjusting device can be separated with three phase winding Z with winding R by first link X and second link Y, make this install very convenient transportation, volume weight also greatly reduces, the adjusting device adjustable capacitor C of any amount that can connect simultaneously, the scope of application of this device is greatly improved, is applicable to start the motor of high power and ultra high power.
Claims (4)
1. the adjustable capacitance type autotransformer device for caused by big motor starting up, comprise winding (R), described winding (R) connects voltage bus by first circuit breaker (QF1), on described winding (QF1), be provided with several taps, tap described in one of them connects motor (M), between described first circuit breaker (QF1) and described motor (M), be provided with second circuit breaker (QF2), it is characterized in that, described winding (R) is also connected with adjusting device, described adjusting device comprises that series connection arranges at least one adjustable capacitor (C), described adjusting device connects three phase windings (Z) by described the third circuit breaker (QF3), in described adjusting device, be provided with selector switch (FK).
2. a kind of adjustable capacitance type autotransformer device for caused by big motor starting up according to claim 1, it is characterized in that, in described adjusting device, be also provided with first link (X) and second link (Y), winding (R) described in the described dismountable connection of first link (X), three phase windings (Z) described in the described dismountable connection of second link (Y).
3. a kind of adjustable capacitance type autotransformer device for caused by big motor starting up according to claim 2, is characterized in that, described selector switch (FK) is arranged in described adjusting device adjustable capacitor (C) two ends described in each.
4. a kind of soft start of high-power motor method according to claim 3, it is characterized in that, comprise following step, steps A: the described selector switch (FK) on all described adjustable capacitors (C) is closed, now described adjusting device short circuit, autotransformer device is low no-load voltage ratio, and secondary voltage is low; Step B: the third described circuit breaker is closed, described adjusting device is connected with described three phase windings (Z), the more described first circuit breaker (QF1) that closes, allow described voltage bus power transmission to described autotransformer device; Step C: the rotating speed or the electric current that detect described motor, when through after a period of time, when described motor (M) accelerates to the first default rotating speed, described selector switch (KF) is opened, allow in described adjusting device line attachment, regulate gradually the current potential of described adjustable capacitor (C), change the inductance of described adjustable capacitor (C), make autotransformer device be hypermutation ratio, secondary voltage increases; Step D: again through after a period of time, during the second rotating speed that described motor accelerates to reach default, described the third circuit breaker (QF3) is opened, made described autotransformer device be reactor and move 1 ~ 10 second; Step e: described second circuit breaker is closed, and described motor switches to full voltage operation, and described autotransformer device is out of service, and starting completes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410262595.8A CN104009676A (en) | 2014-06-13 | 2014-06-13 | Adjustable capacitance type autotransformer device for large-motor starting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410262595.8A CN104009676A (en) | 2014-06-13 | 2014-06-13 | Adjustable capacitance type autotransformer device for large-motor starting |
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| CN104009676A true CN104009676A (en) | 2014-08-27 |
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| CN201410262595.8A Pending CN104009676A (en) | 2014-06-13 | 2014-06-13 | Adjustable capacitance type autotransformer device for large-motor starting |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2717086Y (en) * | 2004-04-24 | 2005-08-10 | 肖应琼 | Dynamic idling compensation arrangement and electric motor soft starting apparatus formed thereby |
| 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 |
| CN202906805U (en) * | 2012-10-12 | 2013-04-24 | 万洲电气股份有限公司 | Special transformer compensating soft start device for large power cage type motor |
| CN203225690U (en) * | 2012-12-25 | 2013-10-02 | 湖南科太电气有限公司 | Large power high voltage motor voltage reduction voltage regulation combination soft starting device |
| CN203933457U (en) * | 2014-06-13 | 2014-11-05 | 宁波宁变电力科技股份有限公司 | A kind of adjustable capacitance type autotransformer device for caused by big motor starting up |
-
2014
- 2014-06-13 CN CN201410262595.8A patent/CN104009676A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2717086Y (en) * | 2004-04-24 | 2005-08-10 | 肖应琼 | Dynamic idling compensation arrangement and electric motor soft starting apparatus formed thereby |
| 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 |
| CN202906805U (en) * | 2012-10-12 | 2013-04-24 | 万洲电气股份有限公司 | Special transformer compensating soft start device for large power cage type motor |
| CN203225690U (en) * | 2012-12-25 | 2013-10-02 | 湖南科太电气有限公司 | Large power high voltage motor voltage reduction voltage regulation combination soft starting device |
| CN203933457U (en) * | 2014-06-13 | 2014-11-05 | 宁波宁变电力科技股份有限公司 | A kind of adjustable capacitance type autotransformer device for caused by big motor starting up |
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Application publication date: 20140827 |
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