CN102025156B - Transformer rectifying system of reversible cold rolling mill - Google Patents
Transformer rectifying system of reversible cold rolling mill Download PDFInfo
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- CN102025156B CN102025156B CN201010563855.7A CN201010563855A CN102025156B CN 102025156 B CN102025156 B CN 102025156B CN 201010563855 A CN201010563855 A CN 201010563855A CN 102025156 B CN102025156 B CN 102025156B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a transformer rectifying system of a reversible cold rolling mill. The system comprises a double-secondary side transformer, ME switches, rectifying cabinets, an uncoiling motor, a No.1 motor in front of the cold rolling mill, a No.2 motor in front of the cold rolling mill, a No.1 motor behind the cold rolling mill and a No.2 motor behind the cold rolling mill, wherein each motor is provided with an ME switch and a rectifying cabinet and connected to a secondary side of a transformer through the rectifying cabinet and the ME switch in turn; the No.1 motor in front of the cold rolling mill and the No.1 motor behind the cold rolling mill or the No.2 motor behind the cold rolling mill are connected in parallel to a first secondary side of the double-secondary side transformer; and the No.2 motor in front of the cold rolling mill and the No.2 motor behind the cold rolling mill or the No.1 motor behind the cold rolling mill are connected in parallel to a second secondary side of the double-secondary side transformer. Due to the adoption of the system, energy consumption can be lowered effectively, the influence of waveform distortion on a power grid is restrained and power transmission efficiency is improved.
Description
Technical field
The present invention relates to the electric power system of reversing cold rolling mill, in particular a kind of transformer rectifying system of energy-conservation reversable cold-rolling machine.
Background technology
Referring to Fig. 1, be the power supply line chart of existing cold-rolling mill transformer rectifying system, existing reversing cold rolling mill by uncoiler, machine before after coiling machine, machine coiling machine and main frame up-down rollers form complete drive system.In existing design, before motor of uncoiler and machine, the two motors of coiling machine is by the transformer-supplied of three secondary, and after machine, the two motors of coiling machine is by the transformer-supplied on a two-pack limit.Before production opportunity, after machine, coiling machine always has a coiling machine to be operated in motoring condition, another is operated in generating state, but generating equipment is when feedback grid, inevitably on circuit and transformer, produced certain energy loss, comprising zero load and the load loss of line loss, transformer.Except this this design will be used a transformer more, and many transformers have just increased energy consumption, have increased cost input, have increased burden to power supply grid simultaneously.
In addition, owing to all disposing rectifier cabinet on every motor, along with the development of Semiconductor Converting Technology, silicon controlled rectifier obtains applying more and more widely in departments such as metallurgy, machinery, chemical industry, traffic and electric power.Meanwhile, these semiconductor device (as silicon controlled rectifier, inverter, power controller, frequency conversion equipment etc.) put into operation, will absorb high and steep pulse current on foot from electrical network, and not absorb strict sine-wave current, thereby cause the distortion of grid voltage waveform, in electrical network, produce harmonic wave." thereby pollution " quality of power supply, has become " public hazards " of electrical network.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The object of the present invention is to provide a kind of transformer rectifying system of reversable cold-rolling machine, be intended to solve the problem that produces harmonic wave " pollution " quality of power supply in the high and switching process of the energy consumption of the whole system of transformer of existing cold-rolling mill in electrical network.
Technical scheme of the present invention is as follows:
A kind of transformer rectifying system of reversable cold-rolling machine, wherein, comprise after a double-secondary transformer, ME switch, rectifier cabinet, uncoiling motor, front No. 1 motor of machine, front No. 2 motors of machine, machine No. 2 motors after No. 1 motor and machine, every motor is a supporting ME switch and a rectifier cabinet all, and every motor is connected to the secondary of transformer successively by rectifier cabinet and ME switch; After front No. 1 motor of machine and machine after No. 1 motor or machine No. 2 motor parallels on the first secondary of double-secondary transformer; After front No. 2 motors of machine and machine after No. 2 motors or machine No. 1 motor parallel on the second secondary of double-secondary transformer.
The transformer rectifying system of described reversable cold-rolling machine, wherein, described uncoiling motor is connected on the first secondary of transformer.
The transformer rectifying system of described reversable cold-rolling machine, wherein, described uncoiling motor is connected on the second secondary of transformer.
The transformer rectifying system of described reversable cold-rolling machine, wherein, connects and is provided with reactor in the inlet wire side of each rectifier cabinet.
The transformer rectifying system of described reversable cold-rolling machine, wherein, rectification and inversion all complete at the secondary of transformer.
The transformer rectifying system of described reversable cold-rolling machine, wherein, the capacity of described transformer is 2800KVA, and a rated voltage is 10KV, and secondary rated voltage is 660V.
The transformer rectifying system of described reversable cold-rolling machine, wherein, rated power and the rated voltage of described uncoiling motor are respectively 800KW, 660V.
The transformer rectifying system of described reversable cold-rolling machine, wherein, after front No. 1 motor of described machine, front No. 2 motors of machine, machine, after No. 1 motor and machine, rated power and the rated voltage of No. 2 motors are respectively 1250KW, 660V.
Beneficial effect of the present invention: the present invention is by reducing by a rectifier transformer, shares a double-secondary transformer by electric motor of coiling machine before uncoiler motor and machine and after machine, reduces energy consumption; Rectification and inversion are all completed at the secondary of transformer simultaneously, reduce harmonic pollution and improve energy-saving effect.
Accompanying drawing explanation
Fig. 1 is the power supply line chart of existing reversable cold-rolling machine transformer rectifying system.
Fig. 2 is the power supply line chart of the reversable cold-rolling machine transformer rectifying system that provides of the embodiment of the present invention.
Embodiment
For making object of the present invention, technical scheme and advantage clearer, clear and definite, referring to accompanying drawing, developing simultaneously, the present invention is described in more detail for embodiment.
Referring to Fig. 2, reversable cold-rolling machine transformer rectifying system provided by the invention comprises double-secondary transformer, ME switch, reactor, rectifier cabinet and motor, each 5, wherein said ME switch, reactor, rectifier cabinet and motor.Each motor configures a set of ME switch, reactor and rectifier cabinet.Described 5 motors are respectively after uncoiling motor, front No. 1 motor of machine, front No. 2 motors of machine, machine No. 2 motors after No. 1 motor and machine, wherein after uncoiling motor, front No. 1 motor of machine and machine, No. 1 motor parallel is connected on the first secondary of transformer, and after described machine, No. 2 motors and front No. 2 motors of machine are connected on the second secondary.Because uncoiling motor only uses in the first passage, and mode of operation is consistent with existing operating state, and described uncoiling motor also can be arranged on the second secondary with No. 2 motors after machine together with front No. 2 motors of machine.Wherein uncoiling driven by motor uncoiler, front No. 1 motor of machine and front No. 2 motors of machine are with coiling machine before motivation jointly, and after machine, after No. 1 motor and machine, No. 2 motors are with coiling machine after motivation jointly.
In the present embodiment, described uncoiling motor is connected on the first secondary of transformer by rectifier cabinet, reactor and ME switch successively, front No. 1 motor of machine is connected on the first secondary of transformer by rectifier cabinet, reactor and ME switch successively, and after machine, No. 1 motor is connected on the first secondary of transformer by rectifier cabinet, reactor and ME switch successively.After machine, No. 2 motors are connected on the first secondary of transformer by rectifier cabinet, reactor and ME switch successively, and front No. 2 motors of machine are connected on the first secondary of transformer by rectifier cabinet, reactor and ME switch successively.After the present invention is also not limited to front No. 1 motor of machine and machine, No. 1 motor parallel is on same secondary, also can front No. 1 motor of machine and machine after No. 2 motor parallels on same secondary.
In addition, also front No. 1 motor of machine and front No. 2 motors of machine can be merged to connection and be a motor (power of this motor want enough great talents can), after machine, after No. 1 motor and machine, No. 2 motors are merged into a motor (power of this motor want enough great talents can).Now, two motors can be connected on the same secondary of transformer.
Transformer model of the present invention is 2800KVA, 10KV/660V; The model of uncoiling motor is 800KW, 660V; After front No. 1 motor of machine, front No. 2 motors of machine, machine, after No. 1 motor and machine, the model of No. 2 motors is 1250KW, 660V.
Utilize the present invention can make new system reduce by a transformer, so just reduced the appearance expense that accounts for of the transformer of 2800KVA; Equally also reduced no-load loss and the load loss of a 2800KVA transformer, thus about energy-conservation 10% left and right.
The present embodiment installs reactor additional in the inlet wire side series connection of rectifier cabinet, thereby has suppressed the impact of wave distortion on electrical network, has improved power transmission efficiency.
The workflow of native system is: reversable cold-rolling machine powers on and starts working, and first after uncoiling motor and machine, after No. 1 motor and machine, No. 2 electrical powers are started working, and carry out the cold rolling of the first passage.Band steel from uncoiler launch cold rolling by main frame up-down rollers after after machine coiling machine roll.
After the cold rolling end of the first passage, reversable cold-rolling machine carries out the cold rolling of the second passage.Now, front No. 1 motor of machine and front No. 2 motors of machine work on power in motoring condition, and after machine after No. 1 motor and machine No. 2 motors in inversion (generating) state.Because No. 1 motor parallel after front No. 1 motor of machine and machine is connected on the first secondary of transformer, after machine, No. 1 motor directly supplies with by rectifier cabinet front No. 1 motor of machine that is in same secondary by the energy of inversion; In like manner, after machine, No. 2 motors are directly supplied with front No. 2 motors of machine in same secondary by the energy over commutation cabinet of inversion.Continue this operation until the cold rolling end-of-job of the second passage.
After the second passage finishes, cold-rolling mill carries out the cold rolling work of the 3rd passage.Now, after machine, after No. 1 motor and machine, No. 2 motors work on power in motoring condition, and front No. 1 motor of machine and front No. 2 motors of machine are in inversion (generating) state.Because No. 1 motor parallel is connected on the first secondary of transformer after front No. 1 motor of machine and machine, front No. 1 motor of machine in inverter mode is No. 1 motor after secondary is just directly supplied with the machine that is in same secondary by the energy of inversion by rectifier cabinet; In like manner front No. 2 motors of machine are directly supplied with No. 2 motors after the machine in agreeing to secondary by the energy over commutation cabinet of inversion.Continue this operation until the cold rolling end-of-job of the 3rd passage.
In passage afterwards, repeat the operation of the second passage and the 3rd passage.Because one, two motors at the same secondary of transformer are operated in motoring condition, one is operated in inverter mode, the energy of inversion has directly just been supplied with an other motor at transformer secondary, brought like this some benefit: (1) is because rectification and inversion all complete at transformer secondary, reduce harmonic pollution, improved power factor.Equally also played power savings.(2) existing inversion energy feeds back to high-pressure side by transformer, and then offer an other transformer, the loss that the electric energy of feedback has just passed through twice transformer like this can offer an other motor, and after transformation because rectification and inversion all complete at transformer secondary, reduce the loss of twice transformer and saved greatly electric energy, according to 70% nominal load, consider, two motor 2500KW just can economize on electricity about 330KVA (per hour).(3) after transformation because rectification and inversion all complete at transformer secondary, the load of transformer will reduce greatly like this, can accomplish P0=P2-P1 in theory, P0: the power that transformer provides; P1: the power of inversion motor feedback; P2: the power of motoring condition electrical consumption.Like this, the zero load of transformer and load loss all reduce greatly, can save energy 20% left and right, simultaneously due to the current reduction of transformer primary side, and also corresponding reduction of line loss like this.(4), according to improved operating mode, the capacity of rectifier transformer also can correspondingly reduce, like this, and the fund input at initial stage and account for and hold expense and also can correspondingly reduce.
The present invention also contrasts the unit before improved unit and transformation, and known by the high-tension current before relatively transforming and improved high-tension current, the energy consumption of improved unit obviously reduces.See table:
High-tension current before transformation:
| Passage | Transformer A before machine | Transformer A after machine | Ruuning situation |
| 1 | 20A | 30A | Use two transformers |
| 2 | 30-40A | 50-60A | Use two transformers |
| 3-7 | 40A | 40A | Use two transformers |
High-tension current after transformation:
| Passage | Transformer A before machine | Transformer A after machine | Ruuning situation |
| 1 | Nothing | 20A | Use a transformer |
| 2 | Nothing | 40A | Use a transformer |
| 3-7 | Nothing | 10A | Use a transformer |
Should be understood that, application of the present invention is not limited to above-mentioned giving an example, and for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (1)
1. the transformer rectifying system of a reversable cold-rolling machine, it is characterized in that, comprise after a double-secondary transformer, ME switch, rectifier cabinet, uncoiling motor, front No. 1 motor of machine, front No. 2 motors of machine, machine No. 2 motors after No. 1 motor and machine, every motor is a supporting ME switch and a rectifier cabinet all, and every motor is connected to the secondary of double-secondary transformer successively by rectifier cabinet and ME switch; After front No. 1 motor of machine and machine after No. 1 motor or machine No. 2 motor parallels on the first secondary of double-secondary transformer; After front No. 2 motors of machine and machine after No. 2 motors or machine No. 1 motor parallel on the second secondary of double-secondary transformer;
Inlet wire side series connection at each rectifier cabinet is provided with reactor;
Rectification and inversion all complete at the secondary of double-secondary transformer;
Described uncoiling motor is connected on the first secondary of double-secondary transformer
orbe connected on the second secondary of double-secondary transformer;
The capacity of described double-secondary transformer is 2800KVA, and a rated voltage is 10KV, and secondary rated voltage is 660V;
Rated power and the rated voltage of described uncoiling motor are respectively 800KW, 660V;
After front No. 1 motor of described machine, front No. 2 motors of machine, machine, after No. 1 motor and machine, rated power and the rated voltage of No. 2 motors are respectively 1250KW, 660V;
First after uncoiling motor and machine, after No. 1 motor and machine, No. 2 electrical powers are started working, and carry out the cold rolling of the first passage; After the cold rolling end of the first passage, reversable cold-rolling machine carries out the cold rolling of the second passage, front No. 1 motor of machine and front No. 2 motors of machine work on power in motoring condition, and after machine after No. 1 motor and machine No. 2 motors in inverter mode, after machine, No. 1 motor directly supplies with by rectifier cabinet front No. 1 motor of machine that is in same secondary by the energy of inversion, and after machine, No. 2 motors are directly supplied with front No. 2 motors of machine in same secondary by the energy over commutation cabinet of inversion; After the second passage finishes, reversable cold-rolling machine carries out the cold rolling work of the 3rd passage, after machine, after No. 1 motor and machine, No. 2 motors work on power in motoring condition, and front No. 1 motor of machine and front No. 2 motors of machine are in inverter mode, front No. 1 motor of machine in inverter mode is No. 1 motor after secondary is just directly supplied with the machine that is in same secondary by the energy of inversion by rectifier cabinet, and front No. 2 motors of machine are directly supplied with No. 2 motors after the machine in same secondary by the energy over commutation cabinet of inversion; Continue this operation until the cold rolling end-of-job of the 3rd passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010563855.7A CN102025156B (en) | 2010-11-29 | 2010-11-29 | Transformer rectifying system of reversible cold rolling mill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010563855.7A CN102025156B (en) | 2010-11-29 | 2010-11-29 | Transformer rectifying system of reversible cold rolling mill |
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| Publication Number | Publication Date |
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| CN102025156A CN102025156A (en) | 2011-04-20 |
| CN102025156B true CN102025156B (en) | 2014-03-26 |
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| CN201010563855.7A Expired - Fee Related CN102025156B (en) | 2010-11-29 | 2010-11-29 | Transformer rectifying system of reversible cold rolling mill |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5896434A (en) * | 1996-07-24 | 1999-04-20 | Kabushiki Kaisha Toshiba | Power supply system for driving reactor coolant recirculation pumps |
| CN2567865Y (en) * | 2002-03-08 | 2003-08-20 | 长沙久莹电力电子设备有限公司 | DC bus structure type high-tension high-low-high high-tension frequency control of motor speed device |
| CN101159425A (en) * | 2007-10-19 | 2008-04-09 | 王武 | Elevator staircase group frequency conversion drive united power supply energy-saving operation method and apparatus |
-
2010
- 2010-11-29 CN CN201010563855.7A patent/CN102025156B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5896434A (en) * | 1996-07-24 | 1999-04-20 | Kabushiki Kaisha Toshiba | Power supply system for driving reactor coolant recirculation pumps |
| CN2567865Y (en) * | 2002-03-08 | 2003-08-20 | 长沙久莹电力电子设备有限公司 | DC bus structure type high-tension high-low-high high-tension frequency control of motor speed device |
| CN101159425A (en) * | 2007-10-19 | 2008-04-09 | 王武 | Elevator staircase group frequency conversion drive united power supply energy-saving operation method and apparatus |
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| CN102025156A (en) | 2011-04-20 |
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