CN102998514B - A kind of electrode current measurement mechanism for low pressure compensation of submerged arc furnace - Google Patents
A kind of electrode current measurement mechanism for low pressure compensation of submerged arc furnace Download PDFInfo
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- CN102998514B CN102998514B CN201210466506.2A CN201210466506A CN102998514B CN 102998514 B CN102998514 B CN 102998514B CN 201210466506 A CN201210466506 A CN 201210466506A CN 102998514 B CN102998514 B CN 102998514B
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Abstract
The invention provides a kind of electrode current measurement mechanism for low pressure compensation of submerged arc furnace, described electrode current measurement mechanism is made up of the identical three-phase separate system of structure, and every phase subsystem comprises Luo-coil sensor for measuring stove low pressure side electric current and capacitance compensation electric current, for measuring the capacitance current detection case of capacitance compensation electric current and for detection of stove low pressure side electric current and calculate the recombination current detection case of electrode current. The present invention has the multiple advantages such as measurement is accurate, measurement category is wide, easy for installation, price is low.
Description
Technical field
The Super-Current Measurement field that the present invention relates to metallurgical industry field, particularly relates to mineral hot furnaceShort net checking of great current when low-pressure side has reactive power compensator, and mend for ore furnace low-pressureElectrode current measurement mechanism when the electrode of repaying is controlled automatically.
Background technology
Mineral hot furnace is the industrial furnace that power consumption is huge, and stove becomes (also referred to as ore heat furnace transformer)Low-pressure side electric current is tens Wan An even in a little Wan An mostly, measure difficulty, therefore a lot of mineral hot furnacesLow-voltage compensation is all that the operation of electrode is also with high pressure taking high-pressure side power factor as controlling targetSide electric current and power as a reference, as shown in Figure 1, CTA、CTB、CTCFor being arranged on heightPress the current transformer of side, it detects high-pressure side line currentBecause of electrode currentBy high-voltage line electric currentThe gear no-load voltage ratio conversion becoming through stove obtains, so electrodeOperation is with the approximate relation of electrode current the method in conjunction with experience of being proportional to of high-pressure side line currentInstruct and carry out. Secondly, also there is the low-pressure side current transformer that utilizes on a small quantity stove to become to carryMeasure CT in Fig. 1a、CTb、CTcFor stove becomes inner low-pressure side current transformer.
In addition, though there is the direct measuring instrument of the large electric current of some ore furnace low-pressures recently,All the situation of not considering to have low-pressure reactive compensation, the electrode current while being not suitable for low-voltage compensation is surveyedAmount, the present electrode current measurement mechanism that is not also specifically applied to ore furnace low-pressure reactive compensationOccur.
Due to transformer with to carry the short net of large electric current to produce a large amount of idle, the impedance of short net andThe voltage drop that induction reactance causes, and due to factors such as short web frame are asymmetric, cause circuit to damageConsume highly, the utilization rate of transformer is low, and three-phase power imbalance, energy consumption increase, so in low pressureThe short net end of side carries out reactive-load compensation and more and more comes into one's own, and operates electricity according to high-tension currentCan the utmost point can not reflect strictly according to the facts into stove power and enter stove power-balance, therefore to stove low pressure sideElectric current and electrode current measure accurately and seem particularly important, and it is related to reactive-load compensationEffect, and the adjusting process of electrode depth.
Nearly all electrode current parameter all adopts the side of above-mentioned high voltage side current conversion at presentMethod, although the method is simple and convenient, due to iron loss and the copper loss of transformer, and low pressure is shortThe impedance of net and the impact of induction reactance, cause conversion the electrode obtained electric current can not reflect into stove electrode electricityStream real conditions, therefore this type of electrode current sample mode has had a strong impact on electrode operation and rawProduce; In the time being provided with low-pressure reactive compensation, can not correctly calculate in this way electrode current,This stove low pressure side electric current be offset current and electrode phase current and, and normally move time compensationElectric current is very large, is also difficult to directly measure.
Summary of the invention
In order to solve the limitation of the large current sample mode of above existing ore furnace low-pressure, thisBrightly provide a kind of electrode current measurement mechanism for low pressure compensation of submerged arc furnace, its made up withThe deficiency of upper method, has that measure accurately, measurement category is wide, easy for installation, price is low etc. manyPlant advantage.
According to the present invention, described electrode current measurement mechanism is by the identical three-phase separate system group of structureBecome, every phase subsystem comprises the conduct for measuring stove low pressure side electric current and capacitance compensation electric currentThe Luo-coil of current sensor, for measure capacitance compensation electric current capacitance current detection case,With for detection of stove low pressure side electric current and calculate the recombination current detection case of electrode current.
Wherein, described Luo-coil is wound in respectively stove change secondary copper pipe and low-voltage capacitance compensating cabinetOn outlet copper pipe, the differentiated voltage signal that its output signal is primary currentDescribed low pressureSignal lead-out wire and the described capacitance current of capacitor compensation cabinet outlet Luo-coil that copper pipe is wound aroundThe integrator that always adds of detection case is connected, and this signal is always added to Integral Processing and obtain capacitance compensationElectric currentThe signal lead-out wire that described stove becomes the Luo-coil that secondary copper pipe is wound around with described inThe integrator that always adds of recombination current detection case is connected, and this signal is always added to Integral Processing and obtainStove low pressure side electric currentDescribed capacitance current detection case is provided with and always adds integrator 1 and outerPortion's binding post 1; Described recombination current detection case is provided with and always adds integrator 2, two additionsDevice 1 and 2 and external cabling terminal 2; Described capacitance current detection case and described recombination currentDetection case connects, by described capacitance compensation electric currentSend into adding of described recombination current detection caseMusical instruments used in a Buddhist or Taoist mass 1 and described stove low pressure side electric currentCarrying out subtraction of vector calculates low-voltage compensation and connectsShort online compensation after-current after entering a littleThis phase recombination current detection case is same with accessThe last phase recombination current detection case of electrode is connected, and the front after-current that compensates is mutually sent into this is mutually compoundThe adder 2 of current detecting case compensates mutually after-current with this and subtracts each other and obtain this phase electrode currentWherein
This phase recombination current detection case is connected with rear phase recombination current detection case, by this phaseSendGive next phase, for the calculating of next phase electrode current.
Preferably, described Luo-coil is pincerlike PCB Luo-coil. Described pincerlike sieve PCBFamily name's coil is made up of A and two half coils of B, and two half coils of described A and B respectivelyRubber seal is in two plastics semicircle shells, and described two plastics semicircle shells are by rotating shaft and bayonet socketConnect to form a complete circular Luo-coil.
Preferably, described low-voltage capacitance compensating cabinet outlet copper pipe and described stove become secondary copper pipe respectivelyFor at least two.
Preferably, every low-voltage capacitance compensating cabinet outlet copper pipe and every stove become secondary copper pipe respectivelyBe wound around a Luo-coil.
Preferably, described recombination current detection case is also provided with Switching Power Supply.
In addition, described recombination current detection case is also connected with displaying scene with electrode current show caseElectrode current data. Described recombination current detection case also with for controlling and showing sent into lowPress the reactive-load compensation control of side electric current, capacitance compensation electric current, compensation point after-current and electrode currentDevice processed connects. Described recombination current detection case is provided with 2 ammeters to show its gained electric currentData. Described capacitance current detection case is provided with 1 ammeter to show its gained electric current numberAccording to.
Compared with adopting the method for high voltage side current transformer conversion, this system is to the large electricity of low pressureStream is directly measured, while having avoided converting from high-pressure side due to transformer copper loss and iron loss and lineThe caused error of the impedance on road and induction reactance, can realize stove become secondary side, capacitance compensation electric current andThe Measurement accuracy of electrode current, its precision can reach in 0.5%, phase place in 0.5%, lineProperty degree can reach 0.1% well.
Utilize Luo-coil sensor, solved and when low-voltage reactive compensator capable is set, adopted high pressureSide translation method and employing stove become offset current and the electrode electricity while carrying low-voltage current mutual inductorA flow measurement difficult problem;
This system is used in conjunction with low pressure compensation of submerged arc furnace, can measure stove low pressure side electric current, electricityHold offset current, compensation access point after-current and electrode current, have and can detect multinomial electric currentThe function of parameter, performance is powerful.
In addition, the pincerlike Luo-coil sensor of PCB that this device uses, it possesses phase place mistakePoor little, measurement category is wide, can not produce the electrical property advantages such as high voltage, and Luo-coil can be usedCarry out the very large or conductor current in irregular shape of measurement size, be very suitable for the short net copper of mineral hot furnacePipe, the required installing space of coil is minimum, installs simple and conveniently, need not destroy conductor.
This device coordinates follow-up analog circuit to form by Luo-coil, have simple in structure, economize materialThe advantages such as material, volume is little, cost is low.
Brief description of the drawings
Fig. 1 is the structural representation of existing mineral hot furnace current transmission system;
Fig. 2 is the polar plot that the electrode current of mineral hot furnace is measured;
Fig. 3 is the structural representation of the electrode current measurement mechanism (phase) of mineral hot furnace of the present inventionFigure;
Fig. 4 (a) is the knot of recombination current detection case in electrode current measurement mechanism of the present inventionStructure block diagram;
Fig. 4 (b) is the knot of capacitance current detection case in electrode current measurement mechanism of the present inventionStructure block diagram;
Fig. 4 (c) is the knot of electrode current show case in electrode current measurement mechanism of the present inventionStructure block diagram;
Fig. 4 (d) is pincerlike PCB Luo-coil in electrode current measurement mechanism of the present inventionStructured flowchart.
Detailed description of the invention
In order to make auditor can further understand structure of the present invention, feature and other objects, existingBe accompanied by accompanying drawing in conjunction with appended preferred embodiment and be described in detail as follows, use the illustrated reality of this accompanying drawingExecute example only for technical scheme of the present invention is described, and non-limiting the present invention.
As shown in Figure 1, Fig. 1 is the structural representation of mineral hot furnace current transmission system. Wherein,In Fig. 1, broken circle inside is body of heater built-in system, in dashed rectangle, is reactive compensation system, itsRemaining is transformer and short net system. Can this electrode current by the direction of current reference shown in Fig. 2The applied vector synthetic method of measurement mechanism, the following (formula of each current phasor calculation relational expression1）：
(formula 1)
As shown in Figure 2, this electrode current measurement mechanism is to adopt above-mentioned vector to its current phasorCalculate the size of electrode current.
The present invention adopts the electrode current measurement mechanism of low pressure compensation of submerged arc furnace, wherein, and as electricityThe Luo-coil of flow sensor is directly measured stove low pressure side and compensation condenser electric current,Then calculate the size of electrode current by above-mentioned vector.
The structure of the electrode current measurement mechanism (phase) that as shown in Figure 3, Fig. 3 is mineral hot furnaceSchematic diagram. This electrode current measurement mechanism is made up of the identical three-phase separate system of structure, often divides mutuallySystem comprise for measure stove low pressure side electric current and capacitance compensation electric current as current senseThe Luo-coil of device, for measuring the capacitance current detection case of capacitance compensation electric current and for inspectionSurvey stove low pressure side electric current and calculate the recombination current detection case of electrode current.
Described Luo-coil is wound in respectively stove and becomes secondary copper pipe and low-voltage capacitance compensating cabinet outletOn copper pipe, the differentiated voltage signal that its output signal is primary current
The signal lead-out wire of described low-voltage capacitance compensating cabinet outlet Luo-coil that copper pipe is wound around withThe integrator that always adds of described capacitance current detection case is connected, and it carries out total accretion office to this signalReason obtains capacitance compensation electric currentWherein
The signal lead-out wire of the Luo-coil that described stove change secondary copper pipe is wound around and described compoundThe integrator that always adds of current detecting case is connected, and it always adds Integral Processing to this signal and obtains stoveLow pressure side electric currentWherein
Described capacitance current detection case is provided with and always adds integrator and external cabling terminal.
Described recombination current detection case is provided with and always adds integrator, two adders and external cablingTerminal.
Described capacitance current detection case is connected with described recombination current detection case, and described electric capacity is mendedRepay electric currentSend into the adder 1 and described stove low pressure side electricity of described recombination current detection caseStreamCarry out subtraction of vector and calculate after low-voltage compensation access point electricity after short online compensationStreamWherein
This phase recombination current detection case and the last phase recombination current detection case that accesses same electrodeBe connected, by the front adder 2 and this phase that compensates mutually after-current and send into this phase recombination current detection caseCompensation after-current subtracts each other and obtains this phase electrode currentWherein
This phase recombination current detection case is connected with rear phase recombination current detection case, by this phaseSendGive next phase, for the calculating of next phase electrode current.
The inner installation of described capacitance current detection case always adds integrator, external cabling terminal, casingAmmeter is installed on door. The inner installation of described recombination current detection case always adds integration and two additionsAmmeter is installed on device, Switching Power Supply, external cabling terminal, cabinet door and can be on-the-spotly shown electric currentData.
Here, adder 1 and adder 2 are carried out subtraction, are only just subtracted vector inputSignal polarity reversal connection and realizing; The stove low pressure side electric current of gainedCapacitance compensation electric currentWithCompensation after-currentSend into idle compensating control as the parameter of controlling and showing, electrode electricityStreamOffer electrode automatic control system and regulate parameter as electrode depth.
Electrode current measurement mechanism composition of the present invention comprises that Luo-coil, recombination current detectCase, capacitance current detection case and electrode current show case. Below in conjunction with Fig. 4, the present invention is carried outDescribe in detail.
Luo-coil shown in Fig. 4 (d) is this device pincerlike PCB Luo-coil used, its PCBCoiler part is made up of A and two half coils of B, these two half coils respectively rubber seals inIn a plastics semicircle shell, so latter two shell by rotating shaft and bayonet socket be connected to form one completeWhole circular Luo-coil. Luo-coil plays current detecting and electrical isolation effect in system,When having electric current in the copper pipe of coil, Luo-coil induces with this size of current just to becomeRatio, the voltage signal that phase place is leading 90 °. This pincer structure coil does not need to destroy copper when mountedPipe is applicable to the measurement of the short net electric current of mineral hot furnace very much.
Fig. 4 (a) is recombination current detection case internal structure schematic diagram, comprises a total accretion in roadDivide device, two-way method of summated ratings device, Switching Power Supply, ammeter and binding post. Always add integratorThe signal acting as by pressing copper pipe Luo-coil to detect to stove step-down carries out filtering, total accretionPoint and range conversion after obtain low-pressure side current signal. Two-way totalizer is respectively to its input signalCarrying out filtering, addition and range conversion obtains this and compensates mutually after-current and electrode current. These metersCalculating module arithmetic desired data and result of calculation all transmits by binding post; Switching Power SupplyTo this mutually device power supply is provided, except giving each vector computing module in this recombination current detection caseProvide outside power supply with ammeter, also provide to this phase capacitance current detection case by binding postDC ± 12V power supply; Two ammeters are installed before this casing, result of calculation is carried out to sceneShow.
Fig. 4 (b) is capacitance current detection case internal structure schematic diagram, and it comprises that a road always addsIntegrator, ammeter and binding post, wherein always add the compensation copper pipe Roche of integrator to inputCoil signal carries out filtering, always obtains capacitance compensation electric current after adding integration and range conversion, and logicalCross binding post and draw casing.
Fig. 4 (c) is depicted as electrode current show case cut-away view, comprises a switch electricitySource and three ammeters, wherein Switching Power Supply provides power supply for ammeter, and three ammeters receiveEach phase recombination current detection case calculates the electrode obtained current signal and shows, guide field operationPersonnel carry out electrode operation.
In sum, native system meets low pressure compensation of submerged arc furnace completely to the large electric current of stove low pressure sideThe needs of parameter, it is simple in structure, and on-the-spot installation, wiring and maintenance do not relate to short net system,Easy construction; Its applying flexible, can convert easily and revise according to the short net situation in scene;This system is not limited to mineral hot furnace offset current and detects, and also can be applicable to power transmission and distribution, chemical industryThe fields such as electrolysis.
Claims (10)
1. for an electrode current measurement mechanism for low pressure compensation of submerged arc furnace, described electrode electricityFlow measuring apparatus is made up of the identical three-phase separate system of structure, and every phase subsystem comprises for measuringStove low pressure side electric currentThe first Luo-coil and measure capacitance compensation electric currentSecond sieveFamily name's coil, for obtaining capacitance compensation electric currentCapacitance current detection case and for obtainingStove low pressure side electric currentAnd calculate electrode currentRecombination current detection case; Wherein,
Described the first Luo-coil and the second Luo-coil be wound in respectively stove become secondary copper pipe andOn low-voltage capacitance compensating cabinet outlet copper pipe, described the first Luo-coil and the second Luo-coil defeatedGo out the differentiated voltage signal that signal is primary current
Described capacitance current detection case is provided with and always adds integrator 1 and external cabling terminal 1;
Described recombination current detection case be provided with always add integrator 2, two adders 1 and 2,With external cabling terminal 2;
The signal of the second Luo-coil that described low-voltage capacitance compensating cabinet outlet copper pipe is wound around drawsOutlet is connected with the integrator 1 that always adds of described capacitance current detection case, to described the second Roche lineThe signal of circle always adds Integral Processing and obtains capacitance compensation electric current
The signal lead-out wire that described stove becomes the first Luo-coil that secondary copper pipe is wound around with described inThe integrator 2 that always adds of recombination current detection case is connected, and the signal of described the first Luo-coil is enteredRow always adds Integral Processing and obtains stove low pressure side electric current
Described capacitance current detection case is connected with described recombination current detection case, and described electric capacity is mendedRepay electric currentSend into the adder 1 and described stove low pressure side electricity of described recombination current detection caseStreamCarry out subtraction of vector and calculate after low-voltage compensation access point electricity after short online compensationStream
This phase recombination current detection case and the last phase recombination current detection case that accesses same electrodeBe connected, by the front adder 2 and this phase that compensates mutually after-current and send into this phase recombination current detection caseCompensation after-current subtracts each other and obtains this phase electrode current
2. electrode current measurement mechanism as claimed in claim 1, is characterized in that, described inThe first Luo-coil and the second Luo-coil are pincerlike PCB Luo-coil.
3. electrode current measurement mechanism as claimed in claim 2, is characterized in that, described inPincerlike PCB Luo-coil is made up of A and two half coils of B, described A and B two and halfRubber seal is in two plastics semicircle shells respectively for circular coil, and described two plastics semicircle shells pass throughRotating shaft is connected to form a complete circular Luo-coil with bayonet socket.
4. electrode current measurement mechanism as claimed in claim 1, is characterized in that, described inLow-voltage capacitance compensating cabinet outlet copper pipe and described stove become secondary copper pipe and are respectively at least two.
5. electrode current measurement mechanism as claimed in claim 4, is characterized in that everyLow-voltage capacitance compensating cabinet outlet copper pipe and every stove become secondary copper pipe and are wound around respectively a Roche lineCircle.
6. the electrode current measurement mechanism as described in as arbitrary in claim 1～5, is characterized in that,Described recombination current detection case is also provided with Switching Power Supply.
7. the electrode current measurement mechanism as described in as arbitrary in claim 1～5, is characterized in that,Described recombination current detection case is also connected with electrode current show case, with displaying scene electrode currentData.
8. electrode current measurement mechanism as claimed in claim 7, is characterized in that, described inRecombination current detection case is provided with 2 ammeters to show stove low pressure side electric currentAnd compensationAfter-current
9. the electrode current measurement mechanism as described in as arbitrary in claim 1～5, is characterized in that,Described recombination current detection case also with for controlling and showing sent into stove low pressure side electric currentCapacitance compensation electric currentCompensation after-currentAnd electrode currentReactive-load compensationController connects.
10. electrode current measurement mechanism as claimed in claim 1, is characterized in that, described inCapacitance current detection case is provided with 1 ammeter to show its gained current data.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112858820B (en) * | 2021-01-19 | 2023-06-13 | 苏州工业园区苏容电气有限公司 | Online life monitoring system for low-voltage conductor of three-phase alternating-current submerged arc furnace |
| CN112858823B (en) * | 2021-01-28 | 2024-01-02 | 苏州工业园区苏容电气有限公司 | Submerged arc furnace electrical parameter monitoring and analyzing system with parallel low-compensation structure |
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