CN101615492A - Three-winding transformer and variable-frequency speed-regulation power supply system - Google Patents
Three-winding transformer and variable-frequency speed-regulation power supply system Download PDFInfo
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- CN101615492A CN101615492A CN200910107011A CN200910107011A CN101615492A CN 101615492 A CN101615492 A CN 101615492A CN 200910107011 A CN200910107011 A CN 200910107011A CN 200910107011 A CN200910107011 A CN 200910107011A CN 101615492 A CN101615492 A CN 101615492A
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Abstract
The invention discloses a kind of three-winding transformer and variable-frequency speed-regulation power supply system.Three-winding transformer comprises a former limit winding and two secondary windings, two secondary windings are respectively Y type and the wiring of △ type, the rated voltage of two secondary windings is identical with rated capacity, and the rated capacity of each secondary winding is greater than 0.6 times of former limit winding rated capacity.Because the rated capacity of each secondary winding is bigger, can directly connects the bypass power supply circuit with a secondary winding and power to motor.In two secondary windings of input termination three-winding transformer of variable-frequency speed-regulation power supply system bypass power supply circuit of the present invention one, a high pressure service entrance switch cabinet and a two winding transformer have been reduced than traditional system, this configuration structure is simple, ratio of performance to price height can greatly reduce equipment investment.
Description
[technical field]
The present invention relates to the motor electric power system, relate in particular to a kind of be applicable to 200～1600KW scope in big matching used three-winding transformer of capacity alternating current motor and variable-frequency speed-regulation power supply system.
[background technology]
Energy-saving and cost-reducing is the inevitable requirement of China's sustainable economic development, statistics according to National Development and Reform Committee shows, having more than 65% in the power consumption of current industrial enterprise is the consumptions of blower fan and pump-type load, operation by variable frequency regulating speed control blower fan and water pump can be saved a large amount of energy, so frequency conversion system is extensive use of in the national economy every profession and trade.
Power consumer for energy-conservation, reduce transformer loss and supply line's loss, improve power consumption equipment operational efficiency equal angles and consider, when selecting the power devices scheme, guarantee to produce the successional repair apparatus that makes things convenient for simultaneously, load for larger capacity, as large capacity motor, usually preferentially select the directly frequency conversion speed-adjusting system of power supply of high-voltage fence for use, and increase the power frequency bypass loop.The allocation plan of the frequency conversion system that traditional high-voltage fence is directly powered is as shown in Figure 1: frequency conversion system is made up of three-winding transformer T1, rectification unit and inversion unit etc.Three-winding transformer forms 12 impulse commutations output (6 power supply mutually) to rectification unit, has the characteristics of the low harmonic wave of grid side.Transformer T1 wherein is according to conventional design, and former secondary rated capacity is symmetrical, and the capacity sum of two secondary winding is identical with former limit coil volume, and the capacity of each secondary winding is 50% of a former limit coil volume.When motor was driven by frequency conversion system, two secondary windings of transformer T1 were powered simultaneously, and the capacity of total capacity and motor M is complementary, and satisfies service requirement.But when the rectification unit of frequency conversion system or inversion unit break down, threephase motor needs power frequency bypass operation, but there is voltage phase difference between two secondary windings because of transformer T1, can not be to the threephase motor parallel operation, and wherein any one winding has only 50% of total capacity because of its capacity, be not enough to power frequency and drive threephase motor, so transformer T1 can not be used for the power frequency bypass power supply, have to dispose high-voltage switch gear GF2 and transformer T2 in addition and finish power frequency bypass operation function, this has caused the huge waste in the equipment investment.
[summary of the invention]
The technical problem to be solved in the present invention provides a kind of three-winding transformer that can directly connect the bypass power supply circuit to the motor power supply.
The technical problem that the present invention will solve in addition provides a kind of simple in structure, the Variable Frequency and Speed Adjusting of Electromotor electric power system that equipment investment is few, the ratio of performance to price is high.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is, a kind of three-winding transformer, comprise a former limit winding and two secondary windings, two secondary windings are respectively Y type and the wiring of △ type, the rated voltage of two secondary windings is identical with rated capacity, and the rated capacity of each secondary winding is greater than 0.6 times of former limit winding rated capacity.
Above-described three-winding transformer, the rated capacity of described two secondary windings equal former limit winding rated capacity respectively.The impedance voltage of described two secondary windings is identical.
A kind of variable-frequency speed-regulation power supply system comprises above-mentioned three-winding transformer, rectification unit, inversion unit, inversion unit output switch, bypass power supply circuit, bypass power supply circuit output switch; Described three-winding transformer is powered to inversion unit by rectification unit; Described inversion unit connects motor by inversion unit output switch; The output of described bypass power supply circuit connects motor by bypass power supply circuit output switch, in two secondary windings of input termination three-winding transformer of described bypass power supply circuit one.
Above-described variable-frequency speed-regulation power supply system, interlocking between described inversion unit output switch and the bypass power supply circuit output switch.
Above-described variable-frequency speed-regulation power supply system, the gross rated capacity of described three-winding transformer secondary winding equal 2 times of rated capacity on the former limit of three-winding transformer, and the rated capacity of each secondary winding equals the rated capacity on the former limit of three-winding transformer.The impedance voltage of two secondary windings is identical.
Three-winding transformer of the present invention has changed 50% the design that the capacity of each secondary winding in the prior art is a former limit coil volume, strengthened the rated capacity of each secondary winding, making a secondary winding directly connect the bypass power supply circuit becomes possibility to the motor power supply.
In two secondary windings of the input termination of the bypass power supply circuit of variable-frequency speed-regulation power supply system of the present invention one, avoided between two secondary windings of three-winding transformer because there is voltage phase difference, can not be to the shortcoming of threephase motor parallel operation, as long as the rated capacity of secondary winding is enough big, just can power to motor separately with a secondary winding.Variable-frequency speed-regulation power supply system of the present invention has reduced a high pressure service entrance switch cabinet and a two winding transformer than traditional system, and this configuration structure is simple, and ratio of performance to price height can greatly reduce equipment investment.
[description of drawings]
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 1 is the fundamental diagram of prior art motor frequency change speed governing electric power system.
Fig. 2 is the fundamental diagram of the embodiment of the invention 2 motor frequency change speed governing electric power systems.
[embodiment]
Embodiments of the invention 1 are a kind of asymmetric three-winding transformers of former secondary rated capacity that is used for the motor frequency change system, are used for to 12 pulses input or 6 inverter supplies of importing mutually, drive motor load.And when frequency converter was out of service, any one secondary winding of transformer can power frequency drive load motor.Its main feature is:
The former limit winding rated capacity of three-winding transformer is S1, and the rated capacity of a secondary winding is S2, and the rated capacity of another secondary winding is S3, and then the former secondary rated capacity design proportion requirement of transformer is: S2=S3 〉=0.6S1; Generally be S2=S3=S1;
The impedance voltage of two secondary windings is identical, is generally 4%～8%;
Be dry-type transformer, band temp monitoring function and cooling blower forced air cooling.
The asymmetric transformer of this former secondary rated capacity is three winding dry-type transformers, and 6kV or 10kV voltage transitions are become 380V or 690V voltage.Two secondary windings are respectively Y type and the wiring of △ type, make between two groups of three-phase alternating-current supplies 30 ° of phase shiftings, thereby constitute 6 outputs mutually, it constitutes 12 impulse commutation circuit with rectification unit, commutating voltage is pulsed 12 times in the cycle in each AC power, reduces electrical network input harmonic wave; Any one secondary winding can be used for power frequency starting load motor.Transformer configuration advanced monitoring temperature and overtemperature alarm assembly, when Transformer Winding Temperature Rise is unusual, will control prime high-voltage board tripping operation automatically, for transformer provides reliable protection.
In variable-frequency speed-regulation power supply system embodiment of the present invention shown in Figure 2, the main power supply circuits that comprise three-winding transformer T1, rectification unit, inversion unit, form as the contactor KM1 of inversion unit output switch.Transformer T1 has disposed monitoring temperature and overtemperature alarm assembly, when Transformer Winding Temperature Rise is unusual, will control the tripping operation of prime high-voltage board automatically, for transformer provides reliable protection.
Transformer T1 is that the asymmetric transformer of former secondary rated capacity is three winding dry-type transformers, and the former limit winding of transformer T1 connects 6kV or 10kV high-voltage power-line by primary cut-out QF1, and 6kV or 10kV voltage transitions are become 380V or 690V voltage.
The output of two secondary windings of transformer T1 connects the input of rectification unit by 2 low-voltage circuit breaker QF2 and QF3.Two secondary windings of transformer T1 are respectively Y type and the wiring of △ type, make between two groups of three-phase alternating-current supplies 30 ° of phase shiftings, thereby constitute 6 outputs mutually, it constitutes 12 impulse commutation circuit with rectification unit, commutating voltage is pulsed 12 times in the cycle in each AC power, can reduce electrical network input harmonic wave.
Three-winding transformer T1 powers to inversion unit by rectification unit, and inversion unit connects motor M power supply by the contactor KM2 as inversion unit output switch.Inversion unit changes into the low-voltage AC that motor needs to the direct current from rectification unit, linear size and the frequency of regulating output current of inversion unit energy, thus control rotating speed of motor, and can also realize direct torque control to motor.
The bypass power supply circuit comprises low-voltage circuit breaker QF4 and contactor KM2.Meet in the power supply piezoelectric transformer T1 secondary winding on the low-voltage circuit breaker QF4, the output switch of bypass power supply circuit is contactor KM2, meets motor M down.Interlocking between the contactor KM2 of bypass power supply circuit and the contactor KM1 of main power supply circuits.
The gross rated capacity of power supply piezoelectric transformer T1 secondary winding equals 2 times of rated capacity on the former limit of three-winding transformer T1, and the rated capacity of two secondary windings equates that promptly the rated capacity of each secondary winding equals the rated capacity on the former limit of three-winding transformer.Like this, any one secondary winding can be used for power frequency starting load motor.Interlocking between described inversion unit output switch and the bypass power supply circuit output switch.
When rectification unit or inversion unit break down must maintenance the time, in order not stop producing, can disconnect low-voltage circuit breaker QF2, QF3 and contactor KM1, but the just direct starting load motor of power frequency of low-voltage circuit breaker QF4 and contactor KM2 that closes simultaneously continues to produce.
In sum, use variable-frequency speed-regulation power supply system embodiment of the present invention to reduce a high pressure service entrance switch cabinet and a two winding transformer than traditional system configuration, this configuration can reduce equipment investment greatly.
Claims (7)
1. three-winding transformer, comprise a former limit winding and two secondary windings, two secondary windings are respectively Y type and the wiring of △ type, it is characterized in that, the rated voltage of two secondary windings is identical with rated capacity, and the rated capacity of each secondary winding is greater than 0.6 times of former limit winding rated capacity.
2. three-winding transformer according to claim 1 is characterized in that, the rated capacity of described two secondary windings equals former limit winding rated capacity respectively.
3. three-winding transformer according to claim 1 is characterized in that the impedance voltage of described two secondary windings is identical.
4. a variable-frequency speed-regulation power supply system comprises the described three-winding transformer of claim 1, rectification unit, inversion unit, inversion unit output switch, bypass power supply circuit, bypass power supply circuit output switch; Described three-winding transformer is powered to inversion unit by rectification unit; Described inversion unit connects motor by inversion unit output switch; The output of described bypass power supply circuit connects motor by bypass power supply circuit output switch, it is characterized in that in two secondary windings of input termination three-winding transformer of described bypass power supply circuit one.
5. variable-frequency speed-regulation power supply system according to claim 4 is characterized in that, interlocking between described inversion unit output switch and the bypass power supply circuit output switch.
6. variable-frequency speed-regulation power supply system according to claim 4, it is characterized in that, the gross rated capacity of described three-winding transformer secondary winding equals 2 times of rated capacity on the former limit of three-winding transformer, and the rated capacity of each secondary winding equals the rated capacity on the former limit of three-winding transformer.
7. variable-frequency speed-regulation power supply system according to claim 4 is characterized in that the impedance voltage of described two secondary windings is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910107011A CN101615492A (en) | 2009-04-28 | 2009-04-28 | Three-winding transformer and variable-frequency speed-regulation power supply system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910107011A CN101615492A (en) | 2009-04-28 | 2009-04-28 | Three-winding transformer and variable-frequency speed-regulation power supply system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951017A (en) * | 2010-08-13 | 2011-01-19 | 蚌埠市禹源环保科技有限公司 | Power frequency automatic switching device for preventing unplanned shutdown of motor |
| CN102295288A (en) * | 2011-06-09 | 2011-12-28 | 重庆大全新能源有限公司 | 24-pair silicon rod polysilicon reduction furnace power supply system |
| CN106997804A (en) * | 2017-05-19 | 2017-08-01 | 国网山东省电力公司莱芜供电公司 | Three winding flexibility ULTC, low-voltage network system and control method |
| CN108199587A (en) * | 2017-12-30 | 2018-06-22 | 中国船舶重工集团公司第七〇二研究所 | A kind of electric railway AC frequency conversion supply unit |
-
2009
- 2009-04-28 CN CN200910107011A patent/CN101615492A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951017A (en) * | 2010-08-13 | 2011-01-19 | 蚌埠市禹源环保科技有限公司 | Power frequency automatic switching device for preventing unplanned shutdown of motor |
| CN102295288A (en) * | 2011-06-09 | 2011-12-28 | 重庆大全新能源有限公司 | 24-pair silicon rod polysilicon reduction furnace power supply system |
| CN106997804A (en) * | 2017-05-19 | 2017-08-01 | 国网山东省电力公司莱芜供电公司 | Three winding flexibility ULTC, low-voltage network system and control method |
| CN108199587A (en) * | 2017-12-30 | 2018-06-22 | 中国船舶重工集团公司第七〇二研究所 | A kind of electric railway AC frequency conversion supply unit |
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Open date: 20091230 |