CN201584788U - Arc furnace low-voltage capacitor dynamic wattless automatic compensation device - Google Patents
Arc furnace low-voltage capacitor dynamic wattless automatic compensation device Download PDFInfo
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- CN201584788U CN201584788U CN2009202944479U CN200920294447U CN201584788U CN 201584788 U CN201584788 U CN 201584788U CN 2009202944479 U CN2009202944479 U CN 2009202944479U CN 200920294447 U CN200920294447 U CN 200920294447U CN 201584788 U CN201584788 U CN 201584788U
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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
- Y02E40/30—Reactive power compensation
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
An arc furnace low-voltage capacitor dynamic wattless automatic compensation device is mainly used for low-voltage capacitor dynamic wattless automatic compensation systems of large and medium arc furnaces in metallurgical industry, chemical industry and the like, and formed by a distribution type compensation short network, a field compensation cabinet, a control system and a selective harmonic suppression device, wherein three phases of the distribution type compensation short network are respectively connected with an electric furnace short network, a water cooled cable and electric poles, the field compensation cabinet connects branch parallel container cabinets to the distribution type compensation short network through flame retardant cables, the control system is connected with a field capacitor container cabinet, a primary side inductor and a secondary electric furnace short network through control cables, and the selective harmonic suppression device adopts reactors, matched with self-heating low-voltage parallel capacitors, at independent braches of the distribution type compensation short network. The device is speedy in maintenance, the field compensation cabinet can be divided into independent branch cabinets which can be maintained during running without special power interruption, and the device has high usability and practicality.
Description
Technical field
The utility model is mainly used in the low-voltage capacitance dynamic reactive self compensating system of the hot stove in big-and-middle-sized ore deposit of industries such as metallurgy, chemical industry.
Background technology
Hot stove in ore deposit and furnace of calcium carbide are submerged arc resistance furnaces, are a kind of inductive loads; It mainly is made up of furnace transformer, electric furnace short net, water-cooled cable, electrode and load (furnace charge).Idle (perception) mainly partly produced by electric arc in the stove, water-cooled cable, electric furnace short net and transformer four, size and electric current square become ratio.
All more than 25000KVA reached, this class electric furnace all adopted three single-phase transformers power supplies, novel electric furnace short nets to connect to the capacity of current metallurgy, the newly-built electric furnace of chemical industry.Because high pressure compensation only solves the power factor (PF) problem of electrical network, and can not solve problems such as uneven mutually, that electrical efficiency is low, energy consumption is high, production efficiency is low, current most producer begins to select for use the secondary side low-voltage capacitance compensating.Current compensation arrangement exists following defective or deficiency to some extent: compensation arrangement causes abnormal heating owing to design is unreasonable, and useful life is short, and maintenance is big, the maintenance cost height.The short net of compensation adopts the single-point access way to insert electric furnace short net, can't match with idle distribution, does not reach best compensation effect, and service life of equipment is short, the waste resource.
The utility model content
The utility model is at above deficiency; connect from the distribution that compensates short net; on-the-spot compensating cabinet design is with practical; to control system exploitation with use, for the hot stove in ore deposit, furnace of calcium carbide low-voltage capacitance compensating provide that a whole set of is reasonable in design, protection is complete, reliability is high, the intelligent ore furnace low-pressure electric capacity dynamic reactive autocompensation installation of big capacity low cost, easy to use, low maintenance.
Ore furnace low-pressure electric capacity dynamic reactive autocompensation installation described in the utility model, by the short net of distributed compensation, on-the-spot compensating cabinet, control system and selective harmonic controlling device constitute, the three-phase of the short net of distributed compensation respectively with electric furnace short net, water-cooled cable is connected with electrode, on-the-spot compensating cabinet is connected to distributed compensation weak point on the net by flame retardant cable with the parallel container cabinet of each branch, control system is by control cable and on-the-spot capacitor panel, the primary side instrument transformer, the secondary electric furnace short net is connected, and the selective harmonic controlling device is to have used the reactor that is complementary with the self-healing low-voltage shunt capacitor in each individual branches of the short net of distributed compensation.
The short net of described distributed compensation is characterised in that: according to electric furnace short net feature and the short net of the distributed access compensation of technology characteristics.For example, the short net of compensation is with every phase 3 points: stove becomes on secondary side termination, electrode flexible cable front end, the electrode collector ring and inserts electric furnace short net, forms substantial distribution collocation structure, and the visual concrete condition of the short net of the distributed compensation of large-scale electric furnace increases access point.
Described on-the-spot compensating cabinet, adopt individual branches protection structural design, every capacitor (C) connects on the corresponding with it load balancing reactor (L) by fire-retardant lead, be connected to contactor KM by fire-retardant lead equally, also capacitor switching elements such as controllable silicon, combination switch, two ends connect respectively that to be connected to compensation behind the high breaking fuse (FU) short online; Full air flow field Optimal Structure Designing in parallel, volume-diminished, the degree of depth is 1000mm only; Capacity strengthens, and the single capacitor operating current reaches 100A, adopts natural air cooled under the light condition of dust pollution.
The most complete dynamic auto control system of described control system, the modeling of fuzzy logic algorithm, programming realize that power factor (PF), three-phase load regulate simultaneously, promptly when satisfying power factor (PF), the complete dynamically full-automatic control system of leveling three-phase load; The many reference amounts signal of system to gathering and setting: primary side electric weight: phase-splitting and gross power factor, phase-splitting and total reactive power, phase-splitting and total apparent power, each phase voltage electric current, the total humorous each harmonic content that involves of each phase voltage electric current; Secondary side electric weight: the on-the-spot capacitor voltage at both ends of secondary side voltage, each node; On-site parameters: on-the-spot capacitor panel in-cabinet temperature, respectively organize copper pipe temperature, the state feedback that comes into operation of on-the-spot capacitor; Setup parameter: the expectation power factor (PF) is carried out analyzing and processing; analysis generates the control result through the fuzzy logic control model calculation; the fuzzy logic control model can be to the power factor (PF) and the arithmetic unit that balances each other; the harmonic filtration controller; the switching time is from adjusting controller; self-built parameter tuning device; the protection controller; the node load controller; the group load governor; pass through driving governor; the compensation driving governor; the filtering driving governor drives the output of execution unit driving element, by the capacitor switching contactor; controllable silicon; the execution unit of outsides such as combination switch carries out on-the-spot switching.
Selective harmonic is administered and is characterised in that: the configuration that each branch road has all adopted man-to-man capacitor and reactor to be complementary, and harmonic wave is not had amplification and has certain inhibitory action, do not need special harmonic wave control.When harmonic excess occurring under the extreme condition, calculate the back by actual measurement and change partly capacitor, change load balancing reactor simultaneously and administer to change the entire system parameter.
The utility model connects from the distribution that compensates short net; on-the-spot compensating cabinet design is with practical; to control system exploitation with use, for the hot stove in ore deposit, furnace of calcium carbide low-voltage capacitance compensating provide that a whole set of is reasonable in design, protection is complete, reliability is high, big capacity low cost, easy to use, low maintenance.1), each phase load of balance when system regulates power factor (PF) has tangible beneficial effect:, promptly satisfy the power factor (PF) requirement of power supply, meet the requirement of the threephase load balance of production technology again; Power factor controlling on the expectation power factor (PF) of setting (setting 0.9～0.95 scope in, giving tacit consent to power factor (PF) is 0.93), the laod unbalance degree is controlled at ≯ ± 1V; Realize phase-splitting inequality compensation truly.2), system adopts advanced fuzzy logic algorithm modeling, programming, complete dynamic, the Automatic Control of realization first; System puts into operation automatically with electric furnace and moves, withdraws from, and need not operating personnel and intervenes, and does not change original technology and operation, improved simultaneously the electric furnace load stability, reduce the operation frequency, operation brings and big guarantee to steady production.3), on-the-spot compensating cabinet is reasonable in design, performance is high, the cabinet size dwindles 20.6%, the material use amount has reduced 8～10%, cost reduces by 12～15%, compensation capacity improved 20～30%, single capacitance current brings up to 100A by original 70A, natural air cooledly just can satisfy use, not need air blast cooling and increase extra energy consumption.4), complete protection: system has and prevented benefit, resonance protection, the temperature rise protection, open-phase protection, the power frequency over-voltage over-current protection, voltage-limiting protection is thrown in the transient overvoltage overcurrent protection again, each branch road of capacitor is alternate, the shorted to earth protection, ground protection etc.Safe in utilization and the operating personnel's of assurance equipment life safety.5), good economic benefit: significantly improve power factor to 0.9～0.95, significantly reduce the laod unbalance degree ≯ ± 1V; Reduce product electricity unit consumption 3%～8%, improve electric furnace production capacity 5%～15%; Reducing maintenance cost, average annual maintenance cost 3%～6% greatly, effectively prolong system useful life, 5～8 years, be current with 2～3 times of equipment, the cost of whole system is fair mutually with current product in usefulness with investment.6), safeguard conveniently, on-the-spot compensating cabinet can independently divide cabinet, be in operation and carry out Maintenance and Repair, does not need special power failure, has very high availability and practicality.
Description of drawings
Fig. 1 is an electric furnace short net structural representation of the present utility model.
Fig. 2 is the structural representation of the utility model master compensation circuit.
Fig. 3 is the structural representation of the utility model dynamic reactive autocompensation installation.
Embodiment
Below in conjunction with accompanying drawing the utility model is elaborated.
As shown in Figure 1, cabinet 1 of the present utility model, strutting piece and part installed part all adopt common iron to make, and partly installed part 2 adopts nonmagnetic substances to make, the effect of elimination current vortex.
Ore furnace low-pressure electric capacity dynamic passive compensation system comprises the short net of compensation, on-the-spot capacitor panel, control system.
Water-cooled cable and copper coin are crossed on A-X, the B-Y of electric furnace short net, C-Z three-phase by the short Netcom of compensation, the compensation access point can adopt every phase three access points, two access points, an access point, increase a kind of in the access point, concrete which kind of mode that adopts, then determine, and, less investment good with compensation effect is benchmark according to the structure of compensation capacity and electric furnace short net.
On-the-spot capacitor panel is connected to the parallel container cabinet of each branch by flame retardant cable and compensates weak point on the net, and the quantity of on-the-spot capacitor panel and specification are then determined according to the distribution of total compensation capacity, access point distribution, electric furnace short net.The housing that cabinet is complete, strutting piece and partly installed part employing common iron making, only partly installed part adopts nonmagnetic substance to make.
Control system is connected with on-the-spot capacitor panel, primary side instrument transformer, secondary electric furnace short net by control cable, corresponding by adjusting interface routine with field apparatus, it is corresponding with the idle distribution of electric furnace short net to adjust the node load controller parameter, other parameter is generated automatically by system and is in operation from whole, thereby realizes the control of whole system.
After each individual branches had been used the reactor of coupling, not only harmonic wave was inhibited and does not amplify, and the self-healing low-voltage shunt capacitor is also well protected, for the life-span prolongation and the reliability of system are got certain effect.Certain harmonic excess occurs as special electric furnace, will be replaced with filtering capacitor to the self-healing low-voltage shunt capacitor of some, change corresponding reactor simultaneously, or increase the filtering cabinet separately and carry out at the nearest access point of electric furnace; And the harmonic filtration controller of control system loaded, adjust the co-ordination that relevant parameter is realized compensation and filtering.
Distributed compensation in the utility model, idle electric arc in the stove, water-cooled cable, electric furnace short net and transformer four characteristics partly of being distributed at electric furnaces such as the hot stove in ore deposit, furnaces of calcium carbide, theory proves all that with test adopting the distribution compensation is The Best Compensation, add that accurate compensation control can make the reactive current that flows in the electric power system reach minimum, even near 0; In conjunction with the actual features of engineering, on the electrode collector ring of the every phase of electric furnace, 3 on preceding, the transformer secondary outlet side head of the cold cable of electric furnace short net water receiving (flexible cable) inserts the short nets of compensation, forms the compensation of distribution on the spot that engineering is used.Increase access point for the visual concrete condition of the short net of the distributed compensation of large-scale electric furnace; For small-sized electric furnace,, can select or single-point access for use at 2 according to actual conditions because compensation rate is little.The on-the-spot compensating cabinet of energy-saving safe, on-the-spot compensating cabinet have adopted full air flow field Optimal Structure Designing in parallel, eliminate vortex design, cable individual branches, the perfect Safety Design of branch's protection.Eliminate vortex design: adjust the distributed architecture of on-the-spot compensating cabinet, strict control structure parameter, reduce the radiation intensity of electromagnetic field, thereby reduce or eliminated the influence of current vortex that big electric current produces to materials such as cabinets; The housing of on-the-spot cabinet, strutting piece and part installed part all adopt the common iron making, only have the part installed part to adopt nonmagnetic substance to make, and the current vortex that just can thoroughly eliminate big electric current generation influences housing, strutting piece and installed part, acomia enthusiasm condition generation.The Safety Design that the protection of cable individual branches, branch is perfect: change all branches into individual branches, branch and connect copper coin and change flame retardant cable into and connect; Each branch by a capacitor, with it corresponding load balancing reactor, switching parts (capacitor switching contactor, controllable silicon, combination switch etc.), be connected the High Rupturing Capacity fuse formation at two ends with main bus bar; form effective individual branches protection; add the foundation to protect of control system; design meets the requirement of GB/T 15576-2008 " low-voltage complete reactive power compensation device ", and security performance reaches the authentication requesting of 3C.Full air flow field Optimal Structure Designing in parallel: adopt the principle of full air flow field in parallel that cabinet body structure is carried out brand-new design, air velocity, the flow of component ambient have been quickened, improved the radiating effect of element, make the cabinet volume-diminished, its degree of depth only 1000mm, compensation capacity strengthens, adopt the natural air cooled effect that reaches be traditional cabinet can't be obtained.
Described selective harmonic is administered, and each individual branches of bucking-out system has used the reactor that is complementary with the self-healing low-voltage shunt capacitor to carry out harmonic wave inhibition design, and the back harmonic wave that comes into operation is effectively suppressed, and does not amplify, do not have increase; Do not need to carry out special harmonic wave control for the electric furnace of harmonic wave in critical field.When harmonic excess occurring under the extreme condition, determine the harmonic number that exceeds standard according to the result of online detection, change or increase corresponding filter part at the harmonic number that exceeds standard,, filter corresponding time the harmonic wave that exceeds standard as filter capacitor, filter reactor, lightning arrester etc.; Thereby carry out rational harmonic wave control, rather than harmonic wave control blindly, increase investment, the waste resource that need not.Control system adopts the complete complete dynamic auto control system of fuzzy logic control system of protection, and control system selects for use medium-and-large-sized controller as master controller, adopts fuzzy logic algorithm modeling, programming; System carries out comprehensive computing adjusting to power factor (PF) and three-phase load simultaneously, makes whole system reach the purpose of leveling three-phase load when satisfying power factor (PF).The complete dynamic auto control system of real realization.System carries out analyzing and processing to the many reference amounts signal sets parameter of gathering and set, analysis generates the control result through the fuzzy logic control model calculation, drive the output of execution unit driving element by driving governor, the execution unit by the outside carries out on-the-spot switching.System distributes by idle distribution each access point amount of coming into operation by the node load controller, thereby makes the configuration of the compensation that distributes realize real distribution compensation rather than the refreshing ornaments of tangible nothing, reaches designed distribution compensation effect.System makes load of each group distribute by design (or design of revising) by group sharing of load device to each load of organizing between node, make the reduction electromagnetic field configuration of the short net of compensation reach best reduction electromagnetic field effect, realize the purpose of real electromagnetic field reduction design.System also generates input signal all kinds of complete protections, and equipment is carried out complete function and protecting, guarantees the safety of equipment.Make the control and the defencive function of system surmount GB/T 15576-2008 " low-voltage complete reactive power compensation device " comprehensively.System assessed the stability of system from adjust controller and self-built parameter tuning device by the switching time, adjusted inner self-built parameter in real time, and the switching time is adjusted in should calculating of systems stabilisation simultaneously; When guaranteeing system stability, reliability service, the action frequency that execution portion is done drops to minimum (per hour being no more than 2 times).Communication interfaces such as the Ethernet of system by reserving, fieldbus dock communication with DCS system, the production information system of applying unit.Compare with existing ore furnace low-pressure capacitance reactive compensation device, 1), each phase load of balance when system regulates power factor (PF) the utlity model has tangible beneficial effect:, promptly satisfy the power factor (PF) requirement of power supply, meet the requirement of the threephase load balance of production technology again; Power factor controlling on the expectation power factor (PF) of setting (setting 0.9～0.95 scope in, giving tacit consent to power factor (PF) is 0.93), the laod unbalance degree is controlled at ≯ ± 1V; Realize phase-splitting inequality compensation truly.2), system adopts advanced fuzzy logic algorithm modeling, programming, complete dynamic, the Automatic Control of realization first; System puts into operation automatically with electric furnace and moves, withdraws from, and need not operating personnel and intervenes, and does not change original technology and operation, improved simultaneously the electric furnace load stability, reduce the operation frequency, operation brings and big guarantee to steady production.3), on-the-spot compensating cabinet is reasonable in design, performance is high, the cabinet size dwindles 20.6%, the material use amount has reduced 8～10%, cost reduces by 12～15%, compensation capacity improved 20～30%, single capacitance current brings up to 100A by original 70A, natural air cooledly just can satisfy use, not need air blast cooling and increase extra energy consumption.4), complete protection: system has and prevented benefit, resonance protection, the temperature rise protection, open-phase protection, the power frequency over-voltage over-current protection, voltage-limiting protection is thrown in the transient overvoltage overcurrent protection again, each branch road of capacitor is alternate, the shorted to earth protection, ground protection etc.Safe in utilization and the operating personnel's of assurance equipment life safety.5), good economic benefit: significantly improve power factor to 0.9～0.95, significantly reduce the laod unbalance degree ≯ ± 1V; Reduce product electricity unit consumption 3%～8%, improve electric furnace production capacity 5%～15%; Reducing maintenance cost, average annual maintenance cost 3%～6% greatly, effectively prolong system useful life, 5～8 years, be current with 2～3 times of equipment, the cost of whole system is fair mutually with current product in usefulness with investment.6), safeguard conveniently, on-the-spot compensating cabinet can independently divide cabinet, be in operation and carry out Maintenance and Repair, does not need special power failure, has very high availability and practicality.
Claims (4)
1. ore furnace low-pressure electric capacity dynamic reactive autocompensation installation, by the short net of distributed compensation, on-the-spot compensating cabinet, control system and selective harmonic controlling device constitute, it is characterized in that, the three-phase of the short net of distributed compensation respectively with electric furnace short net, water-cooled cable is connected with electrode, on-the-spot compensating cabinet is connected to distributed compensation weak point on the net by flame retardant cable with the parallel container cabinet of each branch, control system is by control cable and on-the-spot capacitor panel, the primary side instrument transformer, the secondary electric furnace short net is connected, and the selective harmonic controlling device is to have used the reactor that is complementary with the self-healing low-voltage shunt capacitor in each individual branches of the short net of distributed compensation.
2. ore furnace low-pressure electric capacity dynamic reactive autocompensation installation according to claim 1, it is characterized in that, the short net of compensation is with every phase 3 points: stove becomes on secondary side termination, electrode flexible cable front end, the electrode collector ring and inserts electric furnace short net, forms the short web frame of distributed compensation.
3. ore furnace low-pressure electric capacity dynamic reactive autocompensation installation according to claim 2 is characterized in that, the short net of the distributed compensation of large-scale electric furnace increases access point.
4. ore furnace low-pressure electric capacity dynamic reactive autocompensation installation according to claim 1; it is characterized in that; described on-the-spot compensating cabinet; adopt individual branches protection structural design; every capacitor (C) connects on the corresponding with it load balancing reactor (L) by fire-retardant lead; be connected to contactor KM, controllable silicon and/or combination switch capacitor switching element by fire-retardant lead, two ends are connected to the compensation weak point on the net after connecting high breaking fuse (FU) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202944479U CN201584788U (en) | 2009-12-22 | 2009-12-22 | Arc furnace low-voltage capacitor dynamic wattless automatic compensation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202944479U CN201584788U (en) | 2009-12-22 | 2009-12-22 | Arc furnace low-voltage capacitor dynamic wattless automatic compensation device |
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| CN201584788U true CN201584788U (en) | 2010-09-15 |
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| CN2009202944479U Expired - Lifetime CN201584788U (en) | 2009-12-22 | 2009-12-22 | Arc furnace low-voltage capacitor dynamic wattless automatic compensation device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102263412A (en) * | 2011-02-24 | 2011-11-30 | 宁夏天净天达冶金有限公司 | Energy-saving ferrosilicon smelting device and short-net low-voltage reactive power compensation method |
| CN102593845A (en) * | 2012-03-09 | 2012-07-18 | 云南文山斗南锰业股份有限公司 | Reactive power compensation system of alloy smelting electric furnace system |
| CN102801167A (en) * | 2011-05-24 | 2012-11-28 | 叶选茂 | Inverter hybrid short net power compensating and filtering device |
-
2009
- 2009-12-22 CN CN2009202944479U patent/CN201584788U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102263412A (en) * | 2011-02-24 | 2011-11-30 | 宁夏天净天达冶金有限公司 | Energy-saving ferrosilicon smelting device and short-net low-voltage reactive power compensation method |
| CN102801167A (en) * | 2011-05-24 | 2012-11-28 | 叶选茂 | Inverter hybrid short net power compensating and filtering device |
| CN102593845A (en) * | 2012-03-09 | 2012-07-18 | 云南文山斗南锰业股份有限公司 | Reactive power compensation system of alloy smelting electric furnace system |
| CN102593845B (en) * | 2012-03-09 | 2014-10-15 | 云南文山斗南锰业股份有限公司 | Reactive power compensation system of alloy smelting electric furnace system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100915 |