CN103001550A - Self-excitation compensation soft-starting device for high-power cage motor - Google Patents
Self-excitation compensation soft-starting device for high-power cage motor Download PDFInfo
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- CN103001550A CN103001550A CN2012103848672A CN201210384867A CN103001550A CN 103001550 A CN103001550 A CN 103001550A CN 2012103848672 A CN2012103848672 A CN 2012103848672A CN 201210384867 A CN201210384867 A CN 201210384867A CN 103001550 A CN103001550 A CN 103001550A
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- Y02E40/30—Reactive power compensation
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Abstract
The invention belongs to the technical field of soft starting of high-power cage motors and discloses a self-excitation compensation soft-starting device for a high-power cage motor. The self-excitation compensation soft-starting device for the high-power cage motor mainly solves the problems of closing surge impulse current and bypass jump impulse current of starting of an autotransformer, and is mainly characterized by comprising two 'E'-shaped silicon steel sheet iron core structures, discuses and insulating plates on two sides of each discus are arranged at butt joint ports of two 'E'-shaped silicon steel sheets to form a special-shaped self-excitation starting transformer, a first port of the self-excitation starting transformer is connected with a distribution transformer via a self-excitation starting circuit breaker, a second port of the self-excitation starting transformer is connected with a starting reactive compensation unit, the motor, a bypass full-voltage operation circuit breaker and a bus via a starting compensation circuit breaker and a network-interconnecting circuit breaker, and a series excitation control circuit breaker is serially connected between a third port of the self-excitation starting transformer and a star point. The self-excitation compensation soft-starting device has the advantages that starting instantaneous surge impulse of the autotransformer is weakened, and certain inhibiting effect on operation of bypass short-circuit step impulse current is achieved. Besides, the self-excitation compensation soft-starting device is mainly used for main loops of a self-excitation compensation soft-starting device of the high-power cage motor.
Description
Technical field
The invention belongs to cage modle soft start of high-power motor technical field.Be specifically related to a kind of major loop that compensates soft starter device for the self-excitation of high-power cage-shaped motor.
Background technology
At present along with the quickening of journey is carried out in China's industrialization, at iron and steel, in the industries such as chemical industry, the above motor of 10000kW uses more and more, what these high-power cage-shaped motors generally adopted all is the reduced voltage starting mode, but from the motor starting performance angle analysis, two realistic problems of moment deficiency when all step-down current limit starting modes all can't overcome idle cranking current pulse in the starting process and partial voltage starting, want to control impulse current (being starting current) in the starting, just only have by the step-down mode and come current limliting, current limliting is better, the moment mechanical shock of starting is just less, yet because the moment of motor is square to be directly proportional with terminal voltage, just can't satisfy the starting torque requirement in case the motor terminal voltage range of decrease is excessive, this is unavoidable two antagonism contradictory problems in the caused by big motor starting up, this balance point derives from that to replenish rapidly the part motor starting procedure needed idle in a large number in starting moment, the idle amount that minimizing is drawn from electrical network, when guaranteeing starting torque again, reducing motor terminal voltage reaches to weaken because of electric motor starting moment and causes the greater impact electric current, suppress voltage on line side and subside, really guarantee front end transformer actual power capacity requirement.
When adopting autotransformer to carry out reduced voltage starting, unavoidable meeting produces several outstanding problems:
One, auto-transformer starting drop into moment and always cause certain instantaneous surge impact peak current;
Its two, self electrical structure characteristic of auto-transformer starting have determined that in starting process major loop has extremely of short duration outage self-starting process, in this transfer process, obviously vibration can appear in the motor operation;
Its three, auto-transformer starting is finished, motor speed taps into rated speed, when motor is directly changed into the total head full-speed state from the light running state that taps down, because motor terminal voltage sudden change, can causes the transition of moment to impact surge current and produce.
Therefore, traditional reduced voltage starting mode (such as water resistance, reactor, autotransformer etc.) weakens the aspect to net side starting current restriction and surge impact all certain limitation.
Summary of the invention
It is not enough to the present invention be directed to the large high-voltage motor reduced voltage starting current techique of mentioning in the background technology, a kind of weakening autotransformer of design starts moment surge impact current peak, and operation bypass short circuit impact surge current is also had certain inhibiting major loop for high-power cage-shaped motor self-excitation compensation soft starter device.
Technical solution technical scheme that problem adopts of the present invention is: a kind of for high-power cage-shaped motor self-excitation compensation soft starter device, comprise autotransformer, this autotransformer contains two sections " mountain " font silicon sheet cores, manual shunting switch and the three-phase self-excitation Transformer Winding of three taps is equipped with in inside, three groups of three-phase self-excitation Transformer Winding link to each other with manual shunting switch respectively from the lotus root tap, be provided with three external connectivity ports, it is characterized in that: three craft port of described two sections " mountain " font silicon sheet cores are respectively equipped with the insulation board of three-phase discus and this three-phase discus both sides adjusting air gap, consist of special type self-excitation starting transformer; Special type self-excitation starting transformer the first external connectivity port is connected with distribution transformer through the self-excitation starting circuit breaker; The second external connectivity port and STCP starting compensatory circuit breaker are connected an end and are connected with network interconnecting circuit, be connected in series starting reactive power compensation unit between the other end of STCP starting compensatory circuit breaker and the asterism common port, the other end of network interconnecting circuit is connected an end with high-power cage-shaped motor respectively and is connected with bypass total head operating circuit breaker, the other end of bypass total head operating circuit breaker is connected with bus; Be connected in series series excitation control circuit breaker between the 3rd external connectivity port and the asterism common port.
Be connected with the local compensation circuit that is consisted of by local compensation circuit breaker, local compensation capacitor's seriesu between bus described in the technical solution of the present invention and the special type self-excitation starting transformer common winding asterism common port.
Special type self-excitation starting transformer common winding asterism common port described in the technical solution of the present invention is that the common winding short circuit becomes sealing asterism common port, and the asterism common port all is that each is self-enclosed unsettled.
The present invention is owing to adopt by special type self-excitation starting transformer, the self-excitation starting circuit breaker, the STCP starting compensatory circuit breaker, starting reactive power compensation unit, network interconnecting circuit, bypass total head operating circuit breaker, the major loop of the high-power cage-shaped motor self-excitation compensation soft starter device that series excitation control circuit breaker consists of, wherein, the craft port of two " mountain " type silicon steel sheets that special type self-excitation starting transformer is contained is provided with the insulation board of discus and these discus both sides, the thickness of these two insulation boards is that the gap can require to appropriately adjust according to high-power cage-shaped motor power starting characteristic, the self-excitation starting circuit breaker is connected with distribution transformer, network interconnecting circuit is connected with high-power cage-shaped motor, the two ends of bypass total head operating circuit breaker respectively with bus, high-power cage-shaped motor connects, thereby, during starting, special type self-excitation starting transformer enters from lotus root transformation state, guaranteed motor realization constant voltage and current limiting compensation soft start, simultaneously owing to access simultaneously the STCP starting compensatory unit at the autotransformer secondary side, not only the start loop power factor is compensated, also net side starting current limliting is played certain shunt compensation effect, electric motor starting is finished, when rotating speed taps into rated speed, special type self-excitation starting transformer can enter the loss of excitation state, guaranteed that step-down light running state is directly changed in the total head full speed process, the inductance of self-excitation winding maintains the obvious linearity, obvious voltage can not occur subsides, thereby realize stepped voltage step by step smooth transition be transformed into the total head running status, thoroughly solved the problem that causes moment transition surge current to impact because of motor terminal voltage sudden change.
The present invention can realize reducing starting current by fine adaptation high-power cage-shaped motor, the protection motor, reduce the electrical network impact and be the purpose soft-start mode, its distinguishing feature is: 1, equilibrium relation between fine solution inrush current and the reduced voltage starting, the starting process of high-power cage-shaped motor is split as the journey of making amends for one's faults of falling of constant voltage and current limiting Soft Start-up Process and the shunting of motor side STCP starting compensatory, the effect of constant voltage and current limiting is to utilize single-circuit transformer characteristic step-down current limliting, motor side starting is fallen the benefit effect and is to start moment to replenish rapidly the part motor starting procedure needed idle in a large number, reduces the reactive capability of drawing from electrical network; 2, the traditional auto-transformer starting of fine solution is crossed the of short duration outage self-starting conversion impact shock problem in the title, utilizes the flexible tap transformation of special type self-excitation starting transformer and loss of excitation translation function to realize that well motor is by starting to the transition and conversion that operates steadily; 3, utilize special type self-excitation starting transformer special facture technique to guarantee that loss of excitation self-excitation inductance characteristic has the obvious linearity, guaranteed that step-down light running state is directly changed in the total head full speed process, obvious voltage can not occur subsides, thereby realize stepped voltage step by step smooth transition be transformed into the total head running status, thoroughly solved the problem that causes moment transition surge current to impact because of motor terminal voltage sudden change; 4, simultaneously because the inner innovating reform of special type self-excitation transformer has also changed himself impedance operator, this has certain inhibitory action for weakening the self-excitation starting transformer at starting moment surge impact current peak.
The present invention is mainly used in the self-excitation compensation soft starter device of high-power cage-shaped motor.
Description of drawings
Fig. 1 is the electric wiring schematic diagram of the embodiment of the invention 1.
Fig. 2 is the electric wiring schematic diagram of the embodiment of the invention 2.
Fig. 3 is the special type self-excitation Transformer Winding elementary diagram of the embodiment of the invention 3.
Fig. 4 is the special type self-excitation transformer iron-core structure schematic diagram of the embodiment of the invention 3.
Embodiment
Embodiments of the present invention is further illustrated below in conjunction with accompanying drawing.
In Fig. 1: 1, self-excitation starting circuit breaker QF3,2, series excitation control circuit breaker Q F1,3, STCP starting compensatory circuit breaker Q F2,4, STCP starting compensatory unit C1,5, network interconnecting circuit QF4,6, bypass total head operating circuit breaker QF5,7, high-power cage-shaped motor M, 8, special type self-excitation starting transformer T1, the manual shunting switch K that 9, three tap J1, J2, J3 are arranged, 10, the inner adjustable air gap iron core of self-excitation starting transformer, 11, the inner self-excitation of self-excitation starting transformer winding L, 12, distribution transformer T2,13, lead-in circuit breaker QF7.
Embodiment 1 as shown in Figure 1.The electrical network main bus bar is connected lead-in circuit breaker QF7 input by distribution transformer T2, the leading-out terminal of lead-in circuit breaker QF7 is connected 10(6) kV start loop bus, the start loop bus get electric after access self-excitation starting circuit breaker QF3 end of incoming cables again, the external interface of self-excitation starting circuit breaker QF3 outlet termination special type self-excitation starting transformer T1 1., the inner self-excitation of the inner manually shunting switch K of special type self-excitation starting transformer T1 tap choose the J1 contact through with the external interface of special type self-excitation starting transformer T1 2. an end link to each other, the external interface of the special type self-excitation starting transformer T1 2. other end is divided into two-way output, external interface a road being connected with STCP starting compensatory circuit breaker Q F2 end of incoming cables 2., STCP starting compensatory circuit breaker Q F2 leading-out terminal links to each other with STCP starting compensatory unit C1, STCP starting compensatory unit C1 other end short circuit becomes sealing asterism common port, special type self-excitation starting transformer T1 external interface another road 2. links to each other with network interconnecting circuit QF4 input, network interconnecting circuit QF4 output is with bypass total head operating circuit breaker QF5 output and connect and link to each other, and contact is directly connected high-voltage high-power motor M, and bypass total head operating circuit breaker QF5 input and electrical network 10(6) kV start loop bus is connected, special type self-excitation starting transformer T1 external interface 3. output links to each other with series excitation control circuit breaker Q F1 input, and the series excitation control circuit breaker Q F1 output other end starting transformer common winding short circuit one-tenth of will encourage oneself seals the asterism common port.Special type self-excitation starting transformer T1 common winding short circuit becomes sealing asterism common port, and the asterism common port all is that each is self-enclosed unsettled.
The operation principle of the embodiment of the invention 1 is:
Major loop step-down current limliting compensation start loop is to connect major loop lead-in circuit breaker QF7, the electrical network main bus bar is 10(6 by distribution transformer T2 through lead-in circuit breaker QF7) kV start loop bussed supply, connect series excitation control circuit breaker Q F1, special type self-excitation starting transformer T1 common winding short circuit becomes asterism, connect again self-excitation starting circuit breaker QF3, special type self-excitation starting transformer T1 enters from lotus root transformation state, because manually shunting switch K has adjusted self-excitation transformer tapping J1 position connection in advance, connect again STCP starting compensatory circuit breaker Q F2 this moment, make in the STCP starting compensatory unit C1 connecting system, the start loop power factor is compensated, connect at last network interconnecting circuit QF4, power supply taps into high-power cage-shaped motor M, realizes electric motor constant pressure current limliting compensation soft start overall process.
Major loop total head full speed running loop is that electric motor starting is when finishing rotating speed and tapping into rated speed, series excitation control circuit breaker Q F1 dead electricity disconnects, special type self-excitation starting transformer T1 enters the loss of excitation state, the self-excitation winding L enters the linear inductance state and continues to keep motor brownout operation state, the inside adjustable air gap iron core that the adjustment of voltage lifting this moment induction reactance value derives from special type self-excitation starting transformer T1 is that two insulation board thickness determine, disconnect first STCP starting compensatory circuit breaker Q F2 this moment, make the STCP starting compensatory unit C1 compensating coefficient that in time logs off, the motor natural power factor state that resumes operation, second connect bypass total head operating circuit breaker QF5, make motor enter total head full speed running state, disconnect simultaneously self-excitation starting circuit breaker QF3 and network interconnecting circuit QF4, make special type self-excitation starting transformer T1 withdraw from starting state fully.
In Fig. 2: 14, local compensation circuit breaker Q F6,15, local compensation capacitor C2.
The operation principle of the embodiment of the invention 2 is:
Major loop step-down current limliting compensation start loop is to connect major loop lead-in circuit breaker QF7, the electrical network main bus bar is 10(6 by distribution transformer T2 through lead-in circuit breaker QF7) kV start loop bussed supply, connect series excitation control circuit breaker Q F1, special type self-excitation starting transformer T1 common winding short circuit becomes asterism, connect again self-excitation starting circuit breaker QF3, special type self-excitation starting transformer T1 enters from lotus root transformation state, because manually shunting switch K has adjusted self-excitation transformer tapping J1 position connection in advance, connect again STCP starting compensatory circuit breaker Q F2 this moment, make in the STCP starting compensatory unit C1 connecting system, connect local compensation circuit breaker Q F6,10(6) kV start loop bus is through local compensation circuit breaker Q F6, connect local compensation capacitor C2, the start loop power factor is compensated, connect at last network interconnecting circuit QF4, power supply taps into high-power cage-shaped motor M, realizes electric motor constant pressure current limliting compensation soft start overall process.
Major loop total head full speed running loop is that electric motor starting is when finishing rotating speed and tapping into rated speed, series excitation control circuit breaker Q F1 dead electricity disconnects, special type self-excitation starting transformer T1 enters the loss of excitation state, the self-excitation winding L enters the linear inductance state and continues to keep motor brownout operation state, the inside adjustable air gap iron core that the adjustment of voltage lifting this moment induction reactance value derives from special type self-excitation starting transformer T1 is that two insulation board thickness determine, disconnect first STCP starting compensatory circuit breaker Q F2 this moment, make the STCP starting compensatory unit C1 compensating coefficient that in time logs off, but keeping 10(6) kV start loop bus is through local compensation circuit breaker Q F6, connect local compensation capacitor C2, motor operate power factor will obtain necessary local compensation, second connect bypass total head operating circuit breaker QF5, make motor enter the at full speed running status of local compensation of total head, disconnect simultaneously self-excitation starting circuit breaker QF3 and network interconnecting circuit QF4, make special type self-excitation starting transformer withdraw from starting state fully.
The present invention effectively is divided into several stages with high-power cage-shaped motor starting process: at first be to realize from lotus root constant voltage STCP starting compensatory working stage, the self-excitation starting transformer satisfies single-circuit transformer constant voltage starting characteristic in this process, simultaneously realized idle STCP starting compensatory shunting action in Circuit Fault on Secondary Transformer, can well net side input capacity starting current be controlled at the specified running current of (1.5～1.0) times motor, secondly finish when changing normal light running at electric motor starting, special type self-excitation starting transformer loss of excitation changes the self-excitation inductance over to and keeps motor stabilizing running status working stage, guarantee that changing voltage is without subsideing, the transfer process impulse current is little, thereby realize stepped voltage step by step smooth transition be transformed into the total head running status, motor changes rapidly at full speed normal operating condition working stage of total head over to, has so far finished high pressure self-excitation compensation soft start all processes.
In Fig. 3, Fig. 4: 11-1, the inner self-excitation of special type self-excitation starting transformer winding L a, 11-2, the inner self-excitation of special type self-excitation starting transformer winding L b, 13-3, the inner self-excitation of special type self-excitation starting transformer winding L c, the manual shunting switch K that 9, three tap J1, J2, J3 are arranged, 16, little " mountain " font silicon sheet core, 19, large " mountain " font silicon sheet core, 17-1, A phase discus, 17-2, B phase discus, 17-3, C phase discus, 18-1, A phase insulation board, 18-2, B phase insulation board, 18-3, C phase insulation board.
The operation principle of the embodiment of the invention 3 is: the importation of the winding connection schematic diagram of special type self-excitation starting transformer is from external interface A 1., B, the C three-phase, three-phase self-excitation Transformer Winding is by inner self-excitation winding L a, self-excitation winding L b, the J1a contact is chosen in the self-excitation tap of self-excitation winding L c three tunnel manual shunting switch K through inside, the J1b contact, J1c contact and special type self-excitation transformer A, B, C three-phase external interface 2. output links to each other, external interface output 2. meets U, V, the W three-phase, special type self-excitation transformer self winding through external public output interface 3. with public port X, Y, Z links to each other, and 3. output interface acts on is to form the unsettled outflow output port of asterism for special type self-excitation transformer.
Claims (3)
1. one kind is used for high-power cage-shaped motor self-excitation compensation soft starter device, comprise autotransformer, this autotransformer contains two sections " mountain " font silicon sheet cores, three tap (J1 are equipped with in inside, J2, J3) manual shunting switch (K) and three-phase self-excitation Transformer Winding, three groups of three-phase self-excitation Transformer Winding link to each other with manual shunting switch respectively from the lotus root tap, be provided with three external connectivity ports (1., 2., 3.), it is characterized in that: three craft port of described two sections " mountain " font silicon sheet cores are respectively equipped with the insulation board that three-phase discus and this discus and this three-phase discus both sides are regulated air gap, consist of special type self-excitation starting transformer (T1); Special type self-excitation starting transformer (T1) the first external connectivity port (1.) is connected with distribution transformer through self-excitation starting circuit breaker (QF3); The second external connectivity port (2.) and STCP starting compensatory circuit breaker (QF2) are connected QF4 with network interconnecting circuit) an end be connected, the other end of STCP starting compensatory circuit breaker (QF2) is encouraged oneself with special type and is connected in series starting reactive power compensation unit (4) between the starting transformer common winding asterism common port, the other end of network interconnecting circuit (QF4) is connected QF5 with high-power cage-shaped motor (7) respectively with bypass total head operating circuit breaker) an end be connected, the other end of bypass total head operating circuit breaker (QF5) is connected with bus; Encourage oneself with special type and be connected in series series excitation control circuit breaker (QF1) between the starting transformer common winding asterism common port in the 3rd external connectivity port (3.).
2. according to claim 1 a kind of for high-power cage-shaped motor self-excitation compensation soft starter device, it is characterized in that: described bus is encouraged oneself with special type and is connected with the local compensation circuit of being connected and being consisted of by local compensation circuit breaker (QF6), local compensation capacitor (C2) between the starting transformer common winding asterism common port.
3. according to claim 1 and 2 a kind of for high-power cage-shaped motor self-excitation compensation soft starter device, it is characterized in that: described special type self-excitation starting transformer (T1) common winding asterism common port is that the common winding short circuit becomes sealing asterism common port, and the asterism common port all is that each is self-enclosed unsettled.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012103848672A CN103001550A (en) | 2012-10-12 | 2012-10-12 | Self-excitation compensation soft-starting device for high-power cage motor |
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| CN2012103848672A CN103001550A (en) | 2012-10-12 | 2012-10-12 | Self-excitation compensation soft-starting device for high-power cage motor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103441699A (en) * | 2013-08-01 | 2013-12-11 | 西北核技术研究所 | High-power semiconductor shutdown switch |
| CN112838792A (en) * | 2020-12-31 | 2021-05-25 | 大力电工襄阳股份有限公司 | Intelligent soft starting device |
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| CN202332503U (en) * | 2011-08-15 | 2012-07-11 | 武汉金泰德电气有限公司 | Auto-transformer core capable of realizing smooth switching for starting of high voltage motor |
| 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 |
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| CN2086476U (en) * | 1991-02-26 | 1991-10-09 | 吴荣明 | Overhead travelling motor start stabilization device |
| CN2194049Y (en) * | 1994-04-18 | 1995-04-05 | 孔庆平 | Energy-saving auto-coupling reduced voltage starter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103441699A (en) * | 2013-08-01 | 2013-12-11 | 西北核技术研究所 | High-power semiconductor shutdown switch |
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| CN112838792B (en) * | 2020-12-31 | 2022-04-12 | 大力电工襄阳股份有限公司 | Intelligent soft starting device |
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Application publication date: 20130327 |