CN202906469U - Silicon rectifier apparatus for direct current electric arc furnace - Google Patents
Silicon rectifier apparatus for direct current electric arc furnace Download PDFInfo
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- CN202906469U CN202906469U CN2012204907781U CN201220490778U CN202906469U CN 202906469 U CN202906469 U CN 202906469U CN 2012204907781 U CN2012204907781 U CN 2012204907781U CN 201220490778 U CN201220490778 U CN 201220490778U CN 202906469 U CN202906469 U CN 202906469U
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Abstract
The utility model discloses a silicon rectifier apparatus for a direct current electric arc furnace, and the apparatus comprises a main loop and a control loop; main loop power source is powered by a high voltage isolation switch, a lower end of the high voltage isolation switch is connected with a harmonic wave purifying apparatus and a high pass filter through a high voltage breaker, the lower end of the high voltage isolation switch is also connected with a lightning arrester and two sets of rectifier apparatuses, and the harmonic wave purifying apparatus, the high pass filter, the rectifier apparatuses and the lightning arrester are connected in parallel; the harmonic wave purifying apparatus is formed by fifth, seventh, eleventh and thirteenth harmonic absorbing devices connected in parallel; the harmonic absorbing devices are connected in parallel with the high pass filter; the lower end of the high voltage isolation switch is respectively connected in series with the high voltage breaker through isolation switches of two set of subpaths, and respectively powers up a rectifier transformer of the electric arc furnace; and the apparatus employs a super large thyristor to form a rectifier module, the rectifier module saves equipment investment fund, simplifies structure, reduces volume, reconstructed electric arc furnace improves current sharing coefficient and rectification efficiency, and reliability of the apparatus is improved.
Description
Technical field
The utility model relates to the electric controling element that arc furnace is used in a kind of metallurgical industry, specifically a kind of rectification use of thyristor.
Background technology
Arc furnace is widely used in process for making, utilizes the electric arc that produces between electrode and furnace charge to generate heat, thus melting iron and steel or alloy.The arc furnace of industrial application can be divided three classes: the first kind is direct-heating type, and electric arc occurs in the electrode special rod and by between the furnace charge of melting, furnace charge directly is subject to arc heat.It is mainly used in steel-making, also is used for smelting iron, copper, refractory material, refining liquid steel etc.Equations of The Second Kind is indirect heating type, and electric arc occurs between two electrode special rods, and furnace charge is subject to the radiant heat of electric arc, is used for melting copper, copper alloy etc.This kind stove noise is large, and Melting Quality is poor, is replaced by other stove class gradually.The 3rd class is called mineral hot furnace, be ore take high resistivity as raw material, the bottom of electrode generally is embedded in the furnace charge the inside in the course of the work.Its principle of heating is: when both having utilized electric current to pass through furnace charge, and the heat that charging resistance produces, therefore the heat that has also utilized the electric arc between electrode and furnace charge to produce simultaneously is called again arc resistance furnace.
The arc furnace that exists in the market has ac arc furnace and direct current electric arc furnace, and direct current electric arc furnace is with respect to the arc stability of ac arc furnace and concentrate, and melting bath stirring is good, uniformity of temperature profile in the stove, and the lining wear amount is few; Electric current and voltage fluctuation be little, the impact of electrical network is reduced, and cable life prolongs thereupon; Export license is few, and ton steel electrode consumption rate ac arc furnace lacks 50%, and the direct current electric arc furnace overall performance is better than ac arc furnace, and therefore, using direct current electric arc furnace is the selection of a lot of producers.Because what the productive life electricity consumption was used all is alternating current, so direct current electric arc furnace must build rectification circuit with thyristor, alternating current carried out rectification, the direct current that the output user needs.The core component of the direct current electric arc furnace of transformer secondary outlet is to produce powerful DC power supply, rectifying device is along with capacity constantly increases, the rectifier cabinet local overheating, rectifying device current imbalance etc. between phase and phase and between the element causes Rectification Power Factor decrease in efficiency and power factor to reduce.Therefore must in rectifying device, develop high-power, high voltage, the electrochemistry rectifying device of heavy current.Along with development and the application of controllable silicon technology, wide to the Research Prospects of the rectifying installation of direct current electric arc furnace.
Rectifier is exactly that single-phase or three phase sine alternating current are become adjustable stably unidirectional direct current by rectifier cell.It realizes it mainly being to rely on the elements such as rectifying tube, thyristor to realize by rectification.In addition rectifying device also has a lot, such as turn-off thyristor GTO, reverse conducting triode thyristor, bidirectional thyristor, rectification module, power model IGBT, SIT, MOSFET etc., only inquires into thyristor here.Thyristor has single-phase conduction, and after thyristor added the forward anode voltage, gate pole added suitable forward gate voltage, made the thyristor turn on process be called triggering.In case after the thyristor triggering and conducting, gate pole as long as usually add a direct impulse voltage on gate pole, is called trigger voltage just to its effect out of hand.Utilize this specific character of thyristor, thyristor by certain composition of relations, is made alternating current single-phase by thyristor circuit, thereby realizes rectification.
KHS type arc furnace rectification circuit main circuit adopts two anti-star-like or three-phase full-controlled bridge cophase counter parallel connection technology.The user can according to actual needs, select corresponding type of attachment.The former rectifying device that uses of arc furnace is the KP-200A thyristor, because service time is long, and component aging, failure rate is high, and rectification effect can not meet the demands.And this thyristor maximum current 200A control pole tension scope 200---2000V, finite capacity is not suitable for large capacity rectifier cabinet.Therefore, rectification redesigns with thyristor to KHS type arc furnace in proposition, to adapting to need of production realistic meaning is arranged.
Summary of the invention
Defective or deficiency for above-mentioned prior art existence, the purpose of this utility model is, a kind of direct current electric arc furnace silicon rectifier device is provided, this device adopts the silicon chip diameter phi 77mm of U.S. GE company production line production and the super large thyristor of φ 100mm to form rectification module, this rectification module not only can be saved the equipment investment fund, and simplified the structure of rectifying device, dwindled volume, what is more important, improved arc furnace has improved current stabilizing factor and rectification efficiency, has improved the reliability of device.
In order to achieve the above object, the utility model adopts following technical solution:
A kind of direct current electric arc furnace silicon rectifier device, this device comprises major loop and control loop; Described major loop comprises power supply, and power supply is through high voltage isolator QS power supply, and the lower end of high voltage isolator QS is by primary cut-out DK
3Be connected with harmonic wave purifier and high pass filter, power-supply isolation switch QS lower end also is connected with lightning arrester and two groups of rectifying devices, and harmonic wave purifier, high pass filter, rectifying device and lightning arrester are in parallel;
Described harmonic wave purifier is formed in parallel by 5 times, 7 times, 11 times, 13 subharmonic absorption plants; 5 times, 7 times, 11 times, 13 subharmonic absorption plants are in parallel with described high pass filter;
High voltage isolator QS lower end is by the isolating switch K on two component roads
1, K
2Primary cut-out DK connects respectively
1, DK
2, power to the rectifier transformer of arc furnace respectively; Primary cut-out DK
1, DK
2Connect respectively a rectifier transformer, two rectifier transformers all have a winding, two secondary winding; The DC power supply that a secondary winding of one of them rectifier transformer is transformed into output by rectifier T1 connects the positive pole of arc furnace, and another secondary winding connects the DC power supply that rectifier T2 is transformed into input and connects the negative pole of arc furnace, thereby consists of the closed-loop path; Another rectifier transformer adopts same connected mode to meet rectifier T3, T4, and the both positive and negative polarity that then connects respectively arc furnace also consists of the closed-loop path;
Rectifier T1, T2, T3, T4 form four groups of rectifier bridges, and four groups of rectifier bridges are installed in rectifier cabinet A, the rectifier cabinet B in twos;
Direct current instrument transformer TA1 is installed in rectifier T1 lower end, and direct current instrument transformer TA2, current signal uf are installed in rectifier T3 lower end
1, uf
2As the current feedback signal in the control circuit; Direct current instrument transformer TA1, TA2 be series resistor respectively, direct current instrument transformer TA1 tandem reactor Ld1, direct current instrument transformer TA2 tandem reactor Ld2; Reactor Ld1 is connected the lower end parallel connection and is connected afterwards the positive pole of arc furnace with reactor Ld2, the negative pole of arc furnace is delivered to two rectifier transformers through rectifier T2, T4 with electric current respectively.
The utility model also comprises following other technologies feature:
Described power supply is the three phase supply power supply.
Ground connection after inductance, resistance, the capacitances in series is all adopted in described 5 times, 7 times, 11 times, 13 subharmonic absorption plants.
Described high pass filter is by the parallel circuits of inductance and resistance and the electric capacity rear ground connection that is in series.
Voltmeter V is installed between described rectifier T1, the T2
2, voltmeter V is installed between rectifier T3, the T4
1
Be equipped with between the described arc furnace both positive and negative polarity that BH opens circuit, light loading protection.
The dc parameter general measuring instrument also is equipped with among described rectifier cabinet A, the B.
Described control loop comprises potentiometer W, selector switch K1, reference integrator, alarm relay J
1, the two-way control access; Wherein, potentiometer W is by selector switch K1 access reference integrator, and two outputs of reference integrator connect the two-way control access; Described control access, every road comprises comparator, current regulator, the current feedback module, digital trigger, analog trigger, the spike train modulation, two selector switches, pulse amplifier, the pulse fault shows, the pulse final stage, current foldback circuit and current cut-off module, wherein, reference integrator accesses current regulator by comparator, the output of current regulator is by first selector switch linking number word trigger and analog trigger, the output of digital trigger and analog trigger enters rectifier cabinet all by second selector switch access pulse amplifier after the output access pulse final stage of pulse amplifier; The output access pulse amplifier of spike train modulation; The output access pulse final stage that the pulse fault shows; One tunnel output of current feedback enters comparator, another road output access digital simulation signal conditioner, and the input of current feedback connects a direct current instrument transformer in the major loop; The input of current foldback circuit connects a direct current instrument transformer in the major loop, and an output of current foldback circuit is by current cut-off module linking number word trigger and analog trigger, and second output connects alarm relay J
1, second output is by voltage device ground connection.
Described rectifier T1, T2, T3, T4 all adopt the silicon chip diameter phi 77mm of U.S. GE company production line production and the thyristor of φ 100mm.
Description of drawings
Fig. 1 is the structural representation of major loop of the present utility model.
Fig. 2 is the structural representation of control loop of the present utility model.
Embodiment
As shown in Figure 1, direct current electric arc furnace silicon rectifier device of the present utility model comprises major loop and control loop.Described major loop comprises three phase supply power supply (10KV, 50Hz), and the three phase supply power supply is powered through high voltage isolator QS; Because the arc furnace main manifestations goes out inductance characteristic, produces very large reactive power, very large on the power supply impact, make the power supply distorted when serious, quality degenerates, so the lower end of high voltage isolator QS is by primary cut-out DK
3Be connected with harmonic wave purifier and high pass filter, power-supply isolation switch QS lower end also is connected with lightning arrester and two groups of rectifying devices, and harmonic wave purifier, high pass filter, rectifying device and lightning arrester are in parallel;
Described harmonic wave purifier is used for filtering 5 times, 7 times, 11 times, 13 subharmonic, with the impact of harmonic reduction to electrical network.The harmonic wave purifier is formed in parallel by 5 times, 7 times, 11 times, 13 subharmonic absorption plants, and ground connection after inductance, resistance, the capacitances in series is all adopted in 5 times, 7 times, 11 times, 13 subharmonic absorption plants;
Described high pass filter is in series by the parallel circuits of inductance and resistance and electric capacity, then ground connection.5 times, 7 times, 11 times, 13 subharmonic absorption plants are in parallel with high pass filter.
Described two groups of rectifying devices are to enable another group when one group of failure in rectifying device in order to guarantee.High voltage isolator QS lower end is by the isolating switch K on two component roads
1, K
2Primary cut-out DK connects respectively
1, DK
2, power to the rectifier transformer of arc furnace respectively.Primary cut-out DK
1, DK
2Connect respectively a rectifier transformer, two rectifier transformers all have a winding, two secondary winding.The DC power supply that a secondary winding of one of them rectifier transformer is transformed into output by rectifier T1 connects the positive pole of arc furnace, and another secondary winding connects the DC power supply that rectifier T2 is transformed into input and connects the negative pole of arc furnace, thereby consists of the closed-loop path.Another rectifier transformer adopts same connected mode to meet rectifier T3, T4, so that rectifier T3 output DC, rectifier T4 input dc power, the both positive and negative polarity that connects respectively arc furnace also consists of the closed-loop path.
Rectifier T1, T2, T3, T4 are the cores of whole arc furnace system, it also is innovation of the present utility model, they adopt the super large thyristor of silicon chip diameter 77mm and 100mm, according to user's needs rectifier T1, T2, T3, T4 are formed four groups of corresponding rectifier bridges, four groups of rectifier bridges are installed in rectifier cabinet A, the rectifier cabinet B in twos.
Direct current instrument transformer TA1 is installed in rectifier T1 lower end, and direct current instrument transformer TA2 is installed in rectifier T3 lower end, and TA1, TA2 are in order to measure the bus direct current, current signal uf
1, uf
2As the current feedback signal in the control circuit.Direct current instrument transformer TA1, TA2 be series resistor respectively, direct current instrument transformer TA1 tandem reactor Ld1, direct current instrument transformer TA2 tandem reactor Ld2, and reactor Ld1, Ld2 play the effect of stabilizing circuit: when short circuit appears in circuit, limiting short-circuit current; Can afterflow during the instantaneous interruption of electric current; Fluctuation appears in the restriction direct current.Reactor Ld1 is connected the lower end parallel connection and is connected afterwards the positive pole of arc furnace with reactor Ld2, to the arc furnace power supply, the negative pole of arc furnace is delivered to two rectifier transformers through rectifier T2, T4 with electric current respectively.
Voltmeter V is installed between rectifier T1, the T2
2, voltmeter V is installed between rectifier T3, the T4
1, be used for respectively measuring in real time the busbar voltage of two groups of rectifying devices in the rectifier cabinet.
Be equipped with between the arc furnace both positive and negative polarity that BH opens circuit, light loading protection.
The dc parameter general measuring instrument also is equipped with among rectifier cabinet A, the B, in order to gathering voltage, current signal, power output, electric current, voltage instantaneous value, and print as required the parameter that gathers.
As shown in Figure 2, described control loop comprises potentiometer W, selector switch K1, reference integrator, alarm relay J
1, the two-way control access; Wherein, potentiometer W is by selector switch K1 access reference integrator, and two outputs of reference integrator connect the two-way control access; Two groups of identical control access realize that one the tunnel uses, and one the tunnel is for subsequent use, improves system reliability.
Control access, every road comprises comparator, current regulator, the current feedback module, digital trigger, analog trigger, the spike train modulation, two selector switches, pulse amplifier, the pulse fault shows, the pulse final stage, current foldback circuit and current cut-off module, wherein, reference integrator accesses current regulator by comparator, the output of current regulator is by first selector switch linking number word trigger and analog trigger, the output of digital trigger and analog trigger enters rectifier cabinet all by second selector switch access pulse amplifier after the output access pulse final stage of pulse amplifier; The output access pulse amplifier of spike train modulation; The output access pulse final stage that the pulse fault shows; One tunnel output of current feedback enters comparator, another road output access digital simulation signal conditioner, and the input of current feedback connects a direct current instrument transformer in the major loop; The input of current foldback circuit connects a direct current instrument transformer in the major loop, and an output of current foldback circuit is by current cut-off module linking number word trigger and analog trigger, and second output connects alarm relay J
1, second output is by voltage device ground connection.
Control principle of the present utility model is as follows:
The user adjusts to current value by potentiometer W, and setting value is sent into reference integrator through selector switch K1, the set-point that the reference integrator interruptible customer arranges, and realization equipment starts slowly, avoids impacting.
The current feedback module will be taken from the current signal uf of direct current instrument transformer TA1 or TA2
1Or uf
2With reference integrator relatively after, send into current regulator, by digital simulation conditioning signal module measured value is shown to the user simultaneously.
The described control access of two-way is done selection by selector switch K2, K3 to digital trigger or analog trigger respectively.Digital trigger and analog trigger are two inputs, one output module, and digital trigger is by sending digit pulse, and analog trigger is by sine wave or sawtooth waveforms analog signal, and rectifier T1, T2, T3, T4 among conducting rectifier cabinet A, the B realize rectification.An input signal of each trigger is from current regulator, and another input signal is from the current signal uf of direct current instrument transformer TA1 or TA2 collection
1Or uf
2In order to prevent the major loop Overcurrent, overcurrent protection is set for digital trigger and analog trigger point of incoming cables and the current cut-off module is carried out duplicate protection.Overcurrent protection is used for reporting to the police, and when overcurrent occurring, alarm relay coil J1 gets electric, and the closing of contact left by alarm relay.
Two digital trigger outputs arrive pulse amplifier through selector switch K4, K5 respectively, and the pulse signal that sends is sent into pulse amplifier, through the spike train modulation, adjust pulse signal duty cycle adjustment direct voltage, realize that the DC power supply current/voltage is adjustable.End in the control access is provided with pulse final stage module, aims at many in parallel uses of high-power thyristor, in order to guarantee simultaneously conducting of thyristor, only has trigger current signal formation loop, just analog trigger or digital trigger can send pulse, triggers thyristor.Also have the pulse fault to show on the pulse final stage module.
In addition, control circuit also is provided with phase sequence protective device of computer, current anomaly detects and protective device.When the phase sequence mistake occurring, the J2 coil gets electric, and the J2 normally opened contact is closed, connects the phase sequence alarm circuit.When current anomaly detects and protective device J3 coil gets electricly, the J3 normally opened contact is closed, connects alarm circuit.
The power supply of control loop is taken from major loop, and the control power supply is 3 phase 380V, and supply frequency power frequency 50Hz is by the power supply of control insulating power supply.
Whole system of the present utility model designs by computer aided optimum, and the device reliability test detects, and the high low temperature cyclic test of control system guarantees equipment current stabilizing factor and system reliability.
Claims (9)
1. a direct current electric arc furnace silicon rectifier device is characterized in that, this device comprises major loop and control loop; Described major loop comprises power supply, and power supply is through high voltage isolator QS power supply, and the lower end of high voltage isolator QS is by primary cut-out DK
3Be connected with harmonic wave purifier and high pass filter, power-supply isolation switch QS lower end also is connected with lightning arrester and two groups of rectifying devices, and harmonic wave purifier, high pass filter, rectifying device and lightning arrester are in parallel;
Described harmonic wave purifier is formed in parallel by 5 times, 7 times, 11 times, 13 subharmonic absorption plants; 5 times, 7 times, 11 times, 13 subharmonic absorption plants are in parallel with described high pass filter;
High voltage isolator QS lower end is by the isolating switch K on two component roads
1, K
2Primary cut-out DK connects respectively
1, DK
2, power to the rectifier transformer of arc furnace respectively; Primary cut-out DK
1, DK
2Connect respectively a rectifier transformer, two rectifier transformers all have a winding, two secondary winding; The DC power supply that a secondary winding of one of them rectifier transformer is transformed into output by rectifier T1 connects the positive pole of arc furnace, and another secondary winding connects the DC power supply that rectifier T2 is transformed into input and connects the negative pole of arc furnace, thereby consists of the closed-loop path; Another rectifier transformer adopts same connected mode to meet rectifier T3, T4, and the both positive and negative polarity that then connects respectively arc furnace also consists of the closed-loop path;
Rectifier T1, T2, T3, T4 form four groups of rectifier bridges, and four groups of rectifier bridges are installed in rectifier cabinet A, the rectifier cabinet B in twos;
Direct current instrument transformer TA1 is installed in rectifier T1 lower end, and direct current instrument transformer TA2, current signal uf are installed in rectifier T3 lower end
1, uf
2As the current feedback signal in the control circuit; Direct current instrument transformer TA1, TA2 be series resistor respectively, direct current instrument transformer TA1 tandem reactor Ld1, direct current instrument transformer TA2 tandem reactor Ld2; Reactor Ld1 is connected the lower end parallel connection and is connected afterwards the positive pole of arc furnace with reactor Ld2, the negative pole of arc furnace is delivered to two rectifier transformers through rectifier T2, T4 with electric current respectively.
2. direct current electric arc furnace silicon rectifier device as claimed in claim 1 is characterized in that, described power supply is the three phase supply power supply.
3. direct current electric arc furnace silicon rectifier device as claimed in claim 1 is characterized in that, ground connection after inductance, resistance, the capacitances in series is all adopted in described 5 times, 7 times, 11 times, 13 subharmonic absorption plants.
4. direct current electric arc furnace silicon rectifier device as claimed in claim 1 is characterized in that, described high pass filter is by the parallel circuits of inductance and resistance and the electric capacity rear ground connection that is in series.
5. direct current electric arc furnace silicon rectifier device as claimed in claim 1 is characterized in that, voltmeter V is installed between described rectifier T1, the T2
2, voltmeter V is installed between rectifier T3, the T4
1
6. direct current electric arc furnace silicon rectifier device as claimed in claim 1 is characterized in that, is equipped with between the described arc furnace both positive and negative polarity that BH opens circuit, light loading protection.
7. direct current electric arc furnace silicon rectifier device as claimed in claim 1 is characterized in that, also is equipped with the dc parameter general measuring instrument among described rectifier cabinet A, the B.
8. direct current electric arc furnace silicon rectifier device as claimed in claim 1 is characterized in that, described control loop comprises potentiometer W, selector switch K1, reference integrator, alarm relay J
1, the two-way control access; Wherein, potentiometer W is by selector switch K1 access reference integrator, and two outputs of reference integrator connect the two-way control access; Described control access, every road comprises comparator, current regulator, the current feedback module, digital trigger, analog trigger, the spike train modulation, two selector switches, pulse amplifier, the pulse fault shows, the pulse final stage, current foldback circuit and current cut-off module, wherein, reference integrator accesses current regulator by comparator, the output of current regulator is by first selector switch linking number word trigger and analog trigger, the output of digital trigger and analog trigger enters rectifier cabinet all by second selector switch access pulse amplifier after the output access pulse final stage of pulse amplifier; The output access pulse amplifier of spike train modulation; The output access pulse final stage that the pulse fault shows; One tunnel output of current feedback enters comparator, another road output access digital simulation signal conditioner, and the input of current feedback connects a direct current instrument transformer in the major loop; The input of current foldback circuit connects a direct current instrument transformer in the major loop, and an output of current foldback circuit is by current cut-off module linking number word trigger and analog trigger, and second output connects alarm relay J
1, second output is by voltage device ground connection.
9. direct current electric arc furnace silicon rectifier device as claimed in claim 1 is characterized in that, described rectifier T1, T2, T3, T4 all adopt silicon chip diameter phi 77mm that U.S. GE company production line produces and the thyristor of φ 100mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012204907781U CN202906469U (en) | 2012-09-24 | 2012-09-24 | Silicon rectifier apparatus for direct current electric arc furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012204907781U CN202906469U (en) | 2012-09-24 | 2012-09-24 | Silicon rectifier apparatus for direct current electric arc furnace |
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| Publication Number | Publication Date |
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| CN202906469U true CN202906469U (en) | 2013-04-24 |
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| CN2012204907781U Expired - Fee Related CN202906469U (en) | 2012-09-24 | 2012-09-24 | Silicon rectifier apparatus for direct current electric arc furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350606A (en) * | 2019-06-27 | 2019-10-18 | 荣信汇科电气技术有限责任公司 | A kind of electric arc furnaces DC chopped-wave power supply device and method |
-
2012
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350606A (en) * | 2019-06-27 | 2019-10-18 | 荣信汇科电气技术有限责任公司 | A kind of electric arc furnaces DC chopped-wave power supply device and method |
| CN110350606B (en) * | 2019-06-27 | 2024-04-02 | 荣信汇科电气股份有限公司 | DC chopper power supply device and method for electric arc furnace |
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Granted publication date: 20130424 Termination date: 20130924 |