CN201868879U

CN201868879U - Complete device special for filtering compensation of rolling mill

Info

Publication number: CN201868879U
Application number: CN2010206211906U
Authority: CN
Inventors: 童淮安; 杜小毛; 李飞龙
Original assignee: GUOWANG NANZI HOLDING (HANGZHOU) CO Ltd
Current assignee: GUOWANG NANZI HOLDING (HANGZHOU) CO Ltd
Priority date: 2010-11-23
Filing date: 2010-11-23
Publication date: 2011-06-15
Anticipated expiration: 2020-11-23

Abstract

The utility model relates to a complete device special for filtering compensation of a rolling mill. The complete device is characterized by comprising a circuit breaker, a controller, a five-time filtering branch and a five-time and seven-time filtering branch, wherein the five-time filtering branch is formed by sequentially connecting a thyristor valve, a reactor and a capacitor in series; the five-time and seven-time filtering branch is formed by connecting the thyristor valve with two groups of resonance branches in series; the two groups of resonance branches are respectively formed by sequentially connecting the reactor with the capacitor in series; the output end of the capacitor is grounded; the five-time filtering branch and the five-time and seven-time filtering branch are connected in parallel and are connected to a bus through the circuit breaker; one end of the controller is respectively and electrically connected with the thyristor valves; the other end of the controller is electrically connected with the three-phase bus; a three-phase current and voltage signal of the bus is acquired by the controller; and the thyristor valves are controlled by the controller. By adopting the technical scheme, the complete device can be used for eliminating the characteristic harmonic wave aiming at different frequencies (five times and seven times), governing the harmonic waves and compensating the reactive power.

Description

Milling train filtering compensation special complete device

Technical field

The utility model belongs to a kind of filtering compensation device, specifically belongs to a kind of milling train filtering compensation special complete device that is used for.

Background technology

Develop rapidly along with power electronic technology, in the industrial and mining enterprises of China, the extensive application of power electronic device, controlled, control thyristor as main switch element entirely, the rectifying installation of power electronic device, the extensive use of nonlinear-load such as frequency conversion, inversion equipment, the proposition that harmonic problem is also increasingly extensive, such as Harmonic Interference, harmonic wave amplify, reactive power compensation inefficacy and harmonic wave reactive current be to the influence of electric power system etc.Above-mentioned power electronic equipment is source, especially the milling train industry that harmonic wave produces.

The harm of harmonic current is serious, mainly contains the following aspects:

1. harmonic current produces additional high eddy current iron loss in transformer, makes transformer overheated, has reduced the output capacity of transformer, and transformer noise is increased, and has a strong impact on transformer life.

2. the skin effect of harmonic current diminishes the lead equivalent cross, increases line loss.

3. harmonic current makes supply power voltage produce distortion, influences other various electric equipment cisco unity malfunctions on the electrical network, causes the automatic control equipment misoperation, and metering instrument is inaccurate.

4. harmonic current produces the communication apparatus that closes on and disturbs.

5. harmonic current makes common electric capacity compensation equipment produce the harmonic wave amplification, causes capacitor and capacitor loops overheated, the lost of life, even damage.

6. harmonic current can cause local parallel resonance and the serial resonant of producing in the utility network, causes serious accident and adverse consequences.

Summary of the invention

Technical problem to be solved in the utility model is: provide that a kind of filter effect is obvious, stable, Remarkable Energy Saving milling train filtering compensation special complete device.

For solving the problems of the technologies described above, the utility model by the following technical solutions:

Milling train filtering compensation special complete device, it is characterized in that: comprise circuit breaker, controller, 5 filter branch and 7 filter branch of holding concurrently for 5 times, described 5 filter branch are by thyristor valve, reactor, capacitor is in series successively, described 57 filter branch of holding concurrently are in series by thyristor valve and two groups of resonance branch roads, described two groups of resonance branch roads all are to be in series successively by reactor and capacitor, described capacitor output head grounding, described 5 filter branch insert bus with 7 filter branch of holding concurrently for 5 times are in parallel by circuit breaker, one end of described controller is electrically connected with thyristor valve respectively, the other end of controller is electrically connected with three-phase bus, the three-phase current voltage signal controlled device of bus is gathered, and by controller thyristor valve and thyristor valve is controlled again.

Described thyristor valve is formed by two thyristor inverse parallels, and described thyristor adopts German IXYS element.

Described controller adopts 32 ARM microprocessor chips.

Described capacitor is selected the filtering capacitor of the full film medium of metal for use, and described reactor is a dry type iron core filter reactor.

Described circuit breaker is selected the plastic shell air switch for use.

After adopting above technical scheme: this device can be eliminated the characteristic harmonic wave at different resonance frequencys (5 times, 7 times), administering harmonic wave again can compensating reactive power, administer the requirement that is up to state standards of back harmonic wave, 5-15% generally can economize on electricity, the quality of power supply is obviously improved after the filter input, reduce voltage fluctuation, improve voltage stability, improve quality of voltage.Power factor can be brought up to more than 0.96, makes user's line loss reduce the load-carrying efficiency that can improve distribution transformer, and economic benefit is obvious.

Description of drawings

Fig. 1 is the utility model electrical block diagram.

Embodiment

Referring to Fig. 1, a kind of milling train filtering compensation special complete device, comprise circuit breaker 1,

controller

2,5

filter branch

3,5 double 7 filter branch 4,5 filter branch 3 are by thyristor valve 5, reactor 6, capacitor 7 is in series successively, 7 filter branch 4 of holding concurrently for 5 times are in series by thyristor valve 8 and two groups of resonance branch roads 9, two groups of resonance branch roads 9 all are to be in series successively by reactor and capacitor, capacitor 7 output head groundings, 5 times filter branch is in parallel by circuit breaker 1 access bus with 57 filter branch 4 of holding concurrently, one end of controller 2 is electrically connected with thyristor valve respectively, the other end of controller is electrically connected with three-phase bus, the three-phase current voltage signal controlled device 2 of bus is gathered, and is controlled by 2 pairs of thyristor valves 5 of controller and thyristor valve 8 again.Thyristor valve is formed by two thyristor 10 inverse parallels, and thyristor 10 adopts German IXYS element, and capacitor is selected the filtering capacitor of the full film medium of metal for use, and reactor is a dry type iron core filter reactor.

Controller is controlled thyristor valve according to the current and voltage signals of gathering, controller adopts 32 ARM microprocessor chips, its structure of controller mainly comprises: power circuit, display circuit, key circuit, the electrical measurement circuit, sample circuit and CPU, by power circuit to each other circuit supplies, the electrical measurement circuit is connected with sample circuit and CPU, sample circuit is used to gather the current and voltage signals of transformer, and send conversion of signals to the electrical measurement circuit, the signal that the electrical measurement circuit is sent sample circuit here is handled, carry out the transmitted in both directions that signal is finished in communication with CPU, the cpu monitor operating state, the signal that the electrical measurement circuit is sent here is analyzed, logic determines, calculate, with the operating state of control device.The electrical measurement circuit adopts the special-purpose electric energy measure chip of the ADE7758 model of U.S. ANOLOG DEVICE company production.Controller function is complete easy to operate, and autoalarm is arranged, and every defencive functions such as overvoltage, overcurrent, ultraharmonics are arranged, and guarantees that the product all operations uses monitoring controlling in-house operation.Operation of equipment is convenient, and safe and reliable, specifically, controller also can be selected some general purpose controllers on the market for use, such as: the controller of the JKGF series that s7-200 Programmable Logic Controller that Siemens Company produces or Hua Guan company produce.

Controller adopts the reaction type monitoring, real-time reactive power with load is the switching physical quantity, in 20ms, finish signal data acquisition, calculating, control output, fling-cut switch is finished the zero current input, the switching no-flashy-flow after receiving the switching instruction in less than 10ms, electrical network there is not impact, the capacitor input adopts the precharge technology, has avoided the impact of switched capacitor, makes operation stable more, safe, reliable.For guaranteeing the real-time tracking switching, the whole system response time can be satisfied the needs of quick varying duty less than 30ms, realizes compensation fast.

When harmonic content is bigger in the electrical system (current harmonic content 〉=30%), this device is capacitive in power frequency, improve power factor, when designed resonance frequency, form series resonance, make these two filter branch when this frequency, form low-down impedance, and can absorb most harmonic current, thereby the percent harmonic distortion of voltage and current in the improvement system.

Main feature:

1. manufacture and design one to one for the milling train custom system, eliminate the characteristic harmonic wave as: 5 times, 7 times, 11 times, 13 inferior, filter effect is obvious;

2. can administer harmonic wave again can compensating reactive power, the harmonic wave requirement that is up to state standards after administering, and 5-15% generally can economize on electricity;

3. the quality of power supply was obviously improved after filter dropped into, and reduced voltage pulsation, improved voltage stability, improved quality of voltage. Power factor can be brought up to more than 0.96, makes user's line loss reduce the load-carrying efficiency that can improve distribution transformer, and economic benefit is obvious;

4. perfect control system, defencive function is complete, has short-circuit protection, overvoltage protection, overcurrent protection etc., and is reliable, simple to operate;

5. breaker: top high-performance vacuum contactor is as the switching device, its dependable performance, and electric life can reach 600,000 times, and loss is little;

6. capacitor: adopt the single-phase filter condenser of special manufacturing, its main insulating materials adopts foreign brand name. The filter condenser long service life, loss is little, and (general 4～6 years) use (in the general life-span of capacitor under harmonic load, only have 0.1～1.5 year) under the bigger environment of harmonic wave for a long time;

7. reactor: adopt low-loss filter reactor unshakable in one's determination, reactor normally moves temperature rise and is no more than 35K, and composite loss is less than 0.5%;

8. quick-switching technology, no current impacts, and reaches the equal compensate for rate of TCR;

9. the little capital construction cost of floor space is low, and low voltage operated safety is safeguarded easily;

10. device does not produce harmonic wave, and iron-core reactor does not have radio frequency interference;

11. can effectively reduce the power supply-distribution system loss, energy-saving effect is remarkable;

12. can solve user's increase-volume problem;

13. can filtering user harmonic wave, purify electrical network, power supply-distribution system and automatic control system operation are safer reliable;

14. the zero current switching can not produce oscillatory occurences.System response time≤30ms;

15. withdraw from automatically during the device compensate for failed, can not influence whole electric power system.

The benefit of bringing behind the harmonic wave control:

1. behind the installation harmonic treating apparatus, effectively reduce harmonic current, increased the available capacity of transformer, can increase corresponding load capacity, reduced the required investment of dilatation.

2. behind the installation harmonic treating apparatus, can effectively reduce the loss of transformer, improve the safe operation coefficient of transformer, play energy saving purposes.

Claims

1. milling train filtering compensation special complete device, it is characterized in that: comprise circuit breaker (1), controller (2), 5 filter branch (3) and 7 filter branch (4) of holding concurrently for 5 times, described 5 filter branch (3) are by thyristor valve (5), reactor (6), capacitor (7) is in series successively, described 57 filter branch (4) of holding concurrently are in series by thyristor valve (8) and two groups of resonance branch roads (9), described two groups of resonance branch roads (9) all are to be in series successively by reactor and capacitor, described capacitor (7) output head grounding, described 5 filter branch (3) are in parallel by circuit breaker (1) access bus with 57 filter branch (4) of holding concurrently, one end of described controller (2) is electrically connected with thyristor valve respectively, the other end of controller is electrically connected with three-phase bus, the three-phase current voltage signal controlled device (2) of bus is gathered, and by controller (2) thyristor valve (5) and thyristor valve (8) is controlled again.

2. milling train filtering compensation special complete device according to claim 1 is characterized in that: described thyristor valve is formed by two thyristors (10) inverse parallel, and described thyristor (10) adopts German IXYS element.

3. milling train filtering compensation special complete device according to claim 1 and 2 is characterized in that: described controller (2) adopts 32 ARM microprocessor chips.

4. milling train filtering compensation special complete device according to claim 1 and 2, it is characterized in that: described capacitor is selected the filtering capacitor of the full film medium of metal for use, and described reactor is a dry type iron core filter reactor.

5. milling train filtering compensation special complete device according to claim 1 and 2, it is characterized in that: described circuit breaker (1) is selected the plastic shell air switch for use.