CN102590583A - System and method for measuring current of electric furnace - Google Patents
System and method for measuring current of electric furnace Download PDFInfo
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- CN102590583A CN102590583A CN2012100316753A CN201210031675A CN102590583A CN 102590583 A CN102590583 A CN 102590583A CN 2012100316753 A CN2012100316753 A CN 2012100316753A CN 201210031675 A CN201210031675 A CN 201210031675A CN 102590583 A CN102590583 A CN 102590583A
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Abstract
The invention discloses a system and a method for measuring current of an electric furnace. The electric furnace is powered through a single-phase transformer or a three-phase transformer, and the single-phase transformer or one phase of the three-phase transformer is provided with a starting end and a tail end formed by one or a plurality of conductors. The system for measuring the current of the electric furnace comprises at least a group of rogowski coils, at least one first vector adder and at least one phase current integrator, wherein each group of rogowski coils comprise at least one rogowski coil, the output end of each rogowski coil in each group of rogowski coils is respectively connected with the input end of one first vector adder, the output end of each first vector adder is connected with the input end of one phase current integrator, one group of rogowski coils corresponds to the starting end or the tail end of one single-phase transformer or one phase of the three-phase transformer, and each rogowski coil of each group of rogowski coils surrounds the conductors of the starting end or the tail end of one single-phase transformer or one phase of the three-phase transformer.
Description
Technical field
The present invention relates to large-scale electric furnace measurement and control area, particularly a kind of electric furnace current measurement system and method.
Background technology
In order to monitor the duty of electric furnace, what need to measure electric furnace usually goes into the stove electric current.Electric furnace is connected to electrical network through transformer.One end of transformer connects electrical network, and the other end connects electric furnace, and the voltage transitions that the winding through inside provides electrical network is the voltage that is suitable for electric furnace.Wherein, the end that transformer links to each other with electrical network is called as primary side, and an end that links to each other with electric furnace is called as secondary side.At present measure electric furnace go into the stove electric current time, the mode that generally adopts is: utilize current transformer to measure the primary side current of furnace transformer, i.e. the electric current of the side that links to each other with electrical network of transformer, and reflect electric furnace roughly go into the stove electric current.But, in fact, electric furnace go into the line current that the stove electric current refers to the electric furnace electrode place, the secondary side current of this electrode wires electric current and transformer differs bigger, therefore, the degree of accuracy of this metering system can not be satisfactory.
Though also have some schemes can pass through the secondary side current of Luo-coil measuring transformer at present, promptly the phase current of transformer reflects into the stove electric current, thereby more approaches to go into really the stove electric current.But; Because the number of conductors of Circuit Fault on Secondary Transformer is more or jumping is arranged mutually; And the limited length of Luo-coil often can't be surrounded all conductors to be measured of Circuit Fault on Secondary Transformer, at this moment; Secondary side current that then can't measuring transformer, and can only pass through current transformer measuring transformer primary side current.In addition, for three-phase furnace, because three electrode power imbalances, the circuit that causes electric furnace is asymmetric three-phase circuit, thereby has also brought very big difficulty for measuring electric current.
This shows, when measuring electric furnace at present and going into the stove electric current, secondary side current that often can't measuring transformer, and can only the measuring transformer primary side current, thereby cause measurement result inaccurate.
Summary of the invention
The invention provides a kind of electric furnace current measurement system and method; When going into the stove electric current in order to measure electric furnace in the solution prior art; Secondary side current that often can't measuring transformer, and can only the measuring transformer primary side current, thereby the inaccurate problem of measurement result caused.
According to a first aspect of the invention; A kind of electric furnace current measurement system is provided; Said electric furnace is through single transformer or three-phase transformer power supply; Wherein, one of single transformer or three-phase transformer has top and the end that is made up of one or more conductors mutually, and said electric furnace current measurement system comprises: at least one group of Luo-coil, at least one primary vector totalizer and at least one phase current integrator; Wherein, Every group of Luo-coil comprises at least one Luo-coil, and the output terminal of each Luo-coil links to each other with the input end of a primary vector totalizer respectively in every group of Luo-coil, and the output terminal of each primary vector totalizer links to each other with the input end of a phase current integrator; The top or the end of one phase of corresponding single transformer of one group of Luo-coil or three-phase transformer, and each Luo-coil of every group of Luo-coil surrounds the top or the terminal conductor of a phase of single transformer or three-phase transformer.
Preferable; Each Luo-coil in every group of Luo-coil is around at least one conductor in the top of a phase of a single transformer or three-phase transformer or the terminal conductor; Each Luo-coil in every group of Luo-coil around the number of conductors sum equal top or the quantity sum of terminal conductor of a phase of a said single transformer or three-phase transformer, and each Luo-coil around conductor do not repeat mutually.
Preferable; When said electric furnace is supplied power through three single transformers or a three-phase transformer; Said Luo-coil is six groups; Each six of said primary vector totalizer and said phase current integrators, wherein, the corresponding separately one group of Luo-coil of the top of each phase of each single transformer or three-phase transformer and end.
Preferable; Also comprise: three secondary vector totalizers and three line current integrators; Wherein, The output terminal of per two primary vector totalizers links to each other with the input end of a secondary vector totalizer respectively, and the output terminal of each secondary vector totalizer links to each other with the input end of a line current integrator respectively.
Preferable; When said electric furnace was supplied power through three single transformers or a three-phase transformer, said Luo-coil was three groups, each three of then said primary vector totalizer and said phase current integrators; Wherein, Surround one group of Luo-coil on the conductor at the top of each phase of each single transformer or three-phase transformer, perhaps, surround one group of Luo-coil on the conductor of the end of each phase of each single transformer or three-phase transformer.
Preferable; Each primary vector totalizer all has two output terminals, and wherein, an output terminal is the forward output terminal; Its output valve by each Luo-coil that links to each other with this primary vector totalizer the vector sum of survey electric current; Another output terminal is an inverse output terminal, the vector sum equal and opposite in direction of its output valve and the output of forward output terminal, and phase place is opposite; This electric furnace current measurement system also comprises: three secondary vector totalizers and three line current integrators; Wherein, per two output terminals in six output terminals of said three primary vector totalizers link to each other with the input end of a secondary vector totalizer respectively, and the output terminal of each secondary vector totalizer links to each other with the input end of a line current integrator respectively.
Preferable, when said electric furnace was the hot stove in semiclosed ore deposit, said Luo-coil was installed in the transformer room.
Preferable, when said electric furnace was the hot stove in totally-enclosed ore deposit, said Luo-coil was installed in the transformer room or outside the transformer room.
Preferable, also comprise: the FPGA control circuit, its output terminal with said phase current integrator links to each other.
Preferable, said electric furnace comprises: the hot stove in ore deposit, electroslag furnace and steel-smelting electric furnace.
According to a second aspect of the invention; A kind of electric furnace current measuring method is provided; Said electric furnace is through at least one power supply mutually of at least one single transformer or three-phase transformer, and wherein, each of every single transformer or three-phase transformer has top and the end that is made up of one or more conductors mutually; This method may further comprise the steps: top or the terminal conductor current of measuring at least one phase of said at least one single transformer or three-phase transformer through at least one group of Luo-coil respectively; Wherein, every group of Luo-coil comprises at least one Luo-coil, and the top or the end of a phase of corresponding single transformer of one group of Luo-coil or three-phase transformer; The conductor current that respectively each Luo-coil in every group of Luo-coil is recorded is carried out the vector summation, is respectively organized the primary vector summed result of Luo-coil; Respectively said primary vector summed result is carried out integration, obtain the top or the terminal phase current of at least one phase at least one single transformer or the three-phase transformer.
Preferable; When said electric furnace is supplied power through three single transformers or a three-phase transformer; The implementation that obtains said primary vector summed result comprises: the top and terminal conductor current of measuring each phase of three single transformers or three-phase transformer through six groups of Luo-coils respectively; And the conductor current that each Luo-coil in every group of Luo-coil records is carried out vector sue for peace, obtain the primary vector summed result; Perhaps; Measure the top or the terminal conductor current of each phase of three single transformers or three-phase transformer respectively through three groups of Luo-coils; And the primary vector summed result of the top of each phase of each single transformer that obtains or three-phase transformer or terminal conductor current carried out anti-phase, obtain the primary vector summed result of conductor current at end or top of each phase of said each single transformer or three-phase transformer.
Preferable; Said electric furnace comprises three electrodes; Each electrode respectively with two single transformers or three-phase transformer in two link to each other; It is characterized in that, further comprising the steps of: as respectively the primary vector summed result of the top of adjacent two phases in adjacent two single transformers or the three-phase transformer or terminal conductor current to be carried out vector and sue for peace, obtain the secondary vector summed result; Said secondary vector summed result is carried out integration, obtain top or the line current of the terminal electrode that links to each other mutually of adjacent two in adjacent with this two single transformers or the three-phase transformer.
In the embodiment of the invention; Measure the phase current of furnace transformer through many groups Luo-coil, wherein, every group of Luo-coil comprises a plurality of Luo-coils; By the common phase current of measuring a phase of a single transformer or a three-phase transformer of a plurality of Luo-coils; Can't cooperate totalizer and integrator can record the phase current of transformer again around the problem of living many conductors thereby solved a Luo-coil, thereby improve the accuracy of measurement result.
Description of drawings
Fig. 1 a is the structural drawing of the electric furnace current measurement system in the embodiment of the invention when adopting six groups of Luo-coils;
Fig. 1 b is the structural drawing of the electric furnace current measurement system in the embodiment of the invention when adopting three groups of Luo-coils;
Fig. 2 a is the synoptic diagram that the electric furnace in the embodiment of the invention is supplied power through three single transformers;
Fig. 2 b is the synoptic diagram that the electric furnace in the embodiment of the invention is supplied power through a three-phase transformer;
Fig. 3 a, Fig. 3 b show in the embodiment of the invention Luo-coil staggered end to end two kinds of canoe synoptic diagram of copper pipe that conflux in Circuit Fault on Secondary Transformer outlet termination, and Fig. 3 c and Fig. 3 d show the copper pipe two kinds of canoe synoptic diagram arranging of homonymy end to end that conflux in Circuit Fault on Secondary Transformer outlet termination of Luo-coil in the embodiment of the invention respectively;
Fig. 4 is the process flow diagram of the electric furnace current measuring method in the embodiment of the invention.
Embodiment
Through embodiment the present invention is described in further detail below in conjunction with accompanying drawing, but the present invention is not restricted to this.
Embodiments of the invention provide a kind of electric furnace current measurement system and method; Can solve when the measurement electric furnace is gone into the stove electric current in the prior art; Secondary side current that often can't measuring transformer, and can only the measuring transformer primary side current, thereby the inaccurate problem of measurement result caused.
A kind of electric furnace current measurement system that embodiments of the invention provide; Said electric furnace is through the power supply of single transformer or three-phase transformer, and wherein, one of single transformer or three-phase transformer has top and the end that is made up of one or more conductors mutually; Shown in Fig. 1 a and Fig. 1 b; Said electric furnace current measurement system comprises: at least one group of Luo-coil 11, at least one primary vector totalizer 12 and at least one phase current integrator 13, wherein
Every group of Luo-coil 11 comprises at least one Luo-coil; The output terminal of each Luo-coil links to each other with the input end of a primary vector totalizer 12 respectively in every group of Luo-coil, and the output terminal of each primary vector totalizer 12 links to each other with the input end of a phase current integrator 13;
The top or the end of one phase of one group of Luo-coil, 11 corresponding single transformers or three-phase transformer, and each Luo-coil of every group of Luo-coil surrounds the top or the terminal conductor of a phase of single transformer or three-phase transformer.
In the embodiment of the invention; Measure the top or the terminal phase current of a phase of a single transformer or three-phase transformer through many groups Luo-coil; Wherein, Every group of Luo-coil comprises a plurality of Luo-coils, by common top or the terminal phase current of measuring a phase of a single transformer or three-phase transformer of a plurality of Luo-coils, and can't be thereby solved a Luo-coil around the problem of living many conductors; Cooperate totalizer and integrator can record the top or the terminal phase current of transformer again, thereby improved the accuracy of measurement result.
Preferable; Each Luo-coil in every group of Luo-coil around; Promptly surround the top or at least one terminal conductor of a phase of a single transformer or three-phase transformer; Each Luo-coil in every group of Luo-coil around the number of conductors sum equal top or the quantity sum of terminal conductor of a phase of a said single transformer or three-phase transformer, and each Luo-coil around conductor do not repeat mutually.
Preferable, when there are three electrodes in electric furnace, can adopt three single transformers or a three-phase transformer power supply usually; At this moment; Shown in Fig. 1 a, said Luo-coil is six groups, each six of said primary vector totalizer and said phase current integrators; Wherein, the corresponding separately one group of Luo-coil of the top of each phase of each single transformer or three-phase transformer and end.In order further to measure the line current of electric furnace; Said electric furnace current measurement system; Can also comprise: three secondary vector totalizers and three line current integrators; Wherein, the output terminal of per two primary vector totalizers links to each other with the input end of a secondary vector totalizer respectively, and the output terminal of each secondary vector totalizer links to each other with the input end of a line current integrator respectively.
Perhaps, when there are three electrodes in electric furnace, because a top in mutually of each single transformer or a three-phase transformer is equal and opposite in direction with phase current on terminal the corresponding conductor; Phase place is opposite, therefore, also can adopt the mode among Fig. 1 b to realize; Be that said Luo-coil is three groups; Each three of said primary vector totalizer and said phase current integrators wherein, only surround one group of Luo-coil on the conductor at the top of each phase of each single transformer or three-phase transformer; Perhaps, only on the conductor of the end of each phase of each single transformer or three-phase transformer, surround one group of Luo-coil.Each primary vector totalizer all has two output terminals; Wherein, an output terminal is the forward output terminal, its output valve by each Luo-coil that links to each other with this primary vector totalizer the vector sum of survey electric current; Another output terminal that is connected with phase inverter 18 is an inverse output terminal; The vector sum equal and opposite in direction of its output valve and the output of forward output terminal, phase place is opposite, and then said three primary vector totalizers have six output terminals.At this moment; In order further to measure the line current of electric furnace; Said electric furnace current measurement system also can comprise: three secondary vector totalizers and three line current integrators, wherein; Per two output terminals in six output terminals of said three primary vector totalizers link to each other with the input end of a secondary vector totalizer respectively, and the output terminal of each secondary vector totalizer links to each other with the input end of a line current integrator respectively.
Though in Fig. 1 a, be that example is described with six groups of Luo-coils,, in concrete condition, also can have only two groups of Luo-coils, thereby only measure the top and terminal phase current of a phase of a single transformer or three-phase transformer.For example, in single-phase electricity slag hearth etc. was used, electric furnace had only an electrode, and therefore, the top that only needs to measure a phase of a single transformer or three-phase transformer gets final product with terminal phase current.In addition; In order to make the electric furnace current measurement system in the present embodiment can be applied to multiple electric furnace flexibly and easily, can also this system at first be designed to the mode of six groups of Luo-coils among Fig. 1 a, still; Switch control through internal circuit; Make this measuring system both can be applied to three-phase transformer, thereby measure the top or the terminal phase current of each phase on this three-phase transformer, and utilize the current phasor measurement result to calculate the line current of the electrode of the electric furnace that links to each other with this three-phase transformer; Also single transformer be can be applied to, thereby the top or the terminal phase current of this single transformer only measured.
Electric furnace current measurement system of the present invention can be applied to the hot stove in ore deposit shown in Fig. 2 a and Fig. 2 b.Wherein, Fig. 2 a shows the structural representation that the hot stove in ore deposit is supplied power through three single transformers 22, and Fig. 2 b shows the structural representation that the hot stove in ore deposit is supplied power through a three-phase transformer 22.Power supply the principle in the face of the hot stove in ore deposit shown in Fig. 2 a and Fig. 2 b carries out following simple the introduction down.The hot stove 21 in ore deposit among Fig. 2 a and Fig. 2 b all has three electrode A, B and C, and therefore, the hot stove in this ore deposit should provide voltage through a three-phase transformer or three single transformers.No matter the hot stove in ore deposit is to use three single transformers to provide voltage also to be to use a three-phase transformer that voltage is provided, and its principle all is identical.Introduce as example with the hot stove in the ore deposit of using three single transformers below; Shown in Fig. 2 a; The hot stove 21 in ore deposit wherein is by 22 power supplies of three single transformers; Each single transformer has a top and an end respectively, and wherein a, b, c are respectively the top of three single transformers, and x, y, z are respectively the end of three single transformers.The top of each transformer or end have many strip conductors respectively, and (strip conductor has only drawn among Fig. 2 a; In fact the top of each transformer or end all can have many strip conductors usually), these conductors link to each other with three electrode A, B, C of the hot stove 21 in ore deposit through soft bus 20 respectively.Here be to describe to the situation that adopts three single transformers to supply power among Fig. 2 a, similar with it for the situation that adopts a three-phase transformer that the hot stove in ore deposit is supplied power among Fig. 2 b, repeat no more here.
Introduce electric furnace current measurement system provided by the invention below in detail.Can know from above-mentioned power supply the principle about the hot stove in ore deposit; Secondary side at each single transformer or a three-phase transformer; It is the side that transformer links to each other with the hot stove in ore deposit; Its top all has the hot stove in a large amount of conductors and ore deposit to link to each other with terminal, because number of conductors is numerous, causes the diameter of the conductor bundle of these conductors formations to be far longer than a Luo-coil institute ability conductor surrounded diameter.And when adopting Luo-coil to measure the electric current on the measured conductor, need measured conductor be surrounded fully with Luo-coil, with reference to shown in Figure 1, a Luo-coil 11 has surrounded two conductors in Fig. 1, thereby can measure the electric current on these two conductors.Therefore; If adopt the electric current of Luo-coil 11 measuring transformer secondary sides; Then need and all to surround with all conductors that the hot stove in ore deposit links to each other through soft bus 20; Obviously, this for limited length (length determined the girth of Luo-coil, and girth determined Luo-coil can the conductor surrounded bundle diameter) Luo-coil can't realize.Therefore; In the present invention; Top or end to a phase of a single transformer or a three-phase transformer; Measure top or the phase current on the terminal conductor, the i.e. top of a phase of this single transformer or three-phase transformer or the terminal phase current of a phase of this single transformer or three-phase transformer through one group of Luo-coil.In addition; Because one of a single transformer or a three-phase transformer all is made up of with terminal top mutually, can know that according to circuit theory a top in mutually of a single transformer or a three-phase transformer is equal and opposite in direction with terminal electric current; Phase place is opposite; Therefore, both can measure the top and terminal phase current of a phase of a single transformer or a three-phase transformer respectively, also can only measure top or terminal phase current; Carry out then reverse, thereby try to achieve the phase current at end or top.Be that example is introduced with the single transformer among Fig. 2 a below, the situation of three-phase transformer is similar with it.
The top of each single transformer or end all need be measured by one group of Luo-coil that a plurality of Luo-coil constituted.For example; The top of supposing a single transformer has 10 conductors, and each Luo-coil can surround two conductors, then needs 5 Luo-coils to surround the conductor at this single transformer top; In addition, also need corresponding a plurality of Luo-coils to surround the terminal conductor of this single transformer.Wherein, each Luo-coil institute conductor surrounded can not repeat and can not omit, and can not surround identical conductor in the different Luo-coil that is:, that is to say, a conductor can only be surrounded by a Luo-coil, and can not be surrounded by two Luo-coils simultaneously; And all conductors of this single transformer must all be surrounded by this group Luo-coil, omission can not be arranged, otherwise can influence the degree of accuracy of measurement.
Wherein, Luo-coil can adopt multiple mode when surrounding conductor flexibly, Fig. 3 a, Fig. 3 b and Fig. 3 c and Fig. 3 d illustrated several kinds of preferred modes.Wherein, Fig. 3 a, Fig. 3 b show in the embodiment of the invention Luo-coil staggered end to end two kinds of canoe synoptic diagram of copper pipe that conflux in Circuit Fault on Secondary Transformer outlet termination, and Fig. 3 c and Fig. 3 d show the copper pipe two kinds of canoe synoptic diagram arranging of homonymy end to end that conflux in Circuit Fault on Secondary Transformer outlet termination of Luo-coil in the embodiment of the invention respectively.
Output terminal to each Luo-coil in the top of a single transformer or terminal this group Luo-coil all is connected on the primary vector totalizer, carries out the vector sum computing by the conductor current that this primary vector totalizer is measured each Luo-coil.The resulting result of the output terminal of primary vector totalizer is the electric current time differential of the top or the terminal phase current of single transformer on this small time period.Therefore; For true reduction input current; Obtain the top or the terminal phase current of going up reality of this single transformer; Also need carry out integration, promptly connect a phase current integrator and try to achieve circuit that the voltage to output carries out integration and just can reduce the phase current of this single transformer reality through the primary vector totalizer to the output result of primary vector totalizer.
In addition, top or the phase current on the end of the phase wherein of a single transformer or three-phase transformer have just been tried to achieve by the way.Through phase current, can monitor the duty of this phase in corresponding single transformer or the three-phase transformer.But, further monitor the duty of the hot stove in ore deposit if desired, thereby the hot stove in ore deposit is safeguarded, also need obtain the hot stove electric current in ore deposit, promptly flow through electrode A, B, the last electric current of C, this electric current also can be called the line current of the electrode of the hot stove in ore deposit.Because the hot stove and accessory in this ore deposit has three electrodes, therefore, need try to achieve the line current of three electrodes respectively.Can find out by Fig. 2 a and Fig. 2 b; Each electrode all with wherein two mutually the top or terminal linking to each other of two single transformers or three-phase transformer; Can know according to Kirchhoff's first law; No matter in the still electrode side of hot stove of the secondary side of transformer in the ore deposit, wherein two mutually top or the vector sums of terminal phase current of two single transformers that the line current of each electrode all equals to link to each other with this electrode or three-phase transformer.For example; In Fig. 2 a; The line current of electrode C equals the vector sum of phase current of top c of phase current and upper right corner single transformer of the terminal y of upper left corner single transformer; The line current of electrode B equals the vector sum of phase current of terminal x of phase current and below single transformer of the top b of upper left corner single transformer, and the line current of electrode A equals the vector sum of phase current of top a of phase current and below single transformer of the terminal z of upper right corner single transformer.For three-phase furnace; Because three electrode power imbalances; The circuit that causes electric furnace is asymmetric three-phase circuit, thus can not be simply top or terminal phase current through measuring the single transformer top or the terminal phase current of inferring all the other single transformers.On engineering, should measure the vector value of the top or the terminal phase current of each single transformer respectively, carry out vector stack then, thus acquisition electrode wires electric current.In addition, because electric current is to change constantly, therefore, also need the inlead current integrator that the microcosmic electric current is carried out integration.Particularly, in the present embodiment, the top and terminal phase current that can utilize six groups of Luo-coils and six primary vector totalizers 12 and six phase current integrators 13 among Fig. 1 a can try to achieve each single transformer respectively.In addition; Respectively the output terminal of two primary vector totalizers 12 is connected on the secondary vector totalizer 14 again; Shown in Fig. 1 a; Obtain the top of two single transformers or the vector sum of terminal phase current, and then carry out integration, thereby try to achieve and the top of these two single transformers or the line current on the terminal electrode that links to each other through line current integrator 15.Through similar mode, can try to achieve the line current of other two electrodes.The top or the terminal phase current that also can utilize three groups of Luo-coils and three primary vector totalizers 12 and three phase current integrators 13 among Fig. 1 b to try to achieve each single transformer respectively.In Fig. 1 b, though have only three primary vector totalizers; Each primary vector totalizer all has two output terminals; One of them is the forward output terminal, and it is used to export the vector sum of the electric current that each Luo-coil is surveyed that links to each other with this primary vector totalizer, and another output terminal that is connected with phase inverter 18 is an inverse output terminal; The vector sum equal and opposite in direction of its output valve and the output of forward output terminal; Phase place is opposite, and then said three primary vector totalizers have six output terminals, thereby can try to achieve the top and terminal phase current of each single transformer respectively.In addition; Respectively two output terminals in said six output terminals are connected on the secondary vector totalizer 14 again; Shown in Fig. 1 b; Obtain the top of two single transformers or the vector sum of terminal phase current, and then carry out integration, thereby try to achieve and the top of these two single transformers or the line current on the terminal electrode that links to each other through line current integrator 15.Through similar mode, can try to achieve the line current of other two electrodes.
Though be to be that example describes in the present embodiment with the hot stove in the ore deposit of three-phase,, it should be appreciated by those skilled in the art that this invention also can be applied to other electric furnaces, like the hot stove in ore deposit, electroslag furnace and converter etc.In addition, when electric furnace is the hot stove in semiclosed ore deposit, damaged by the high temperature outside the electric furnace, then can said at least one group of Luo-coil be installed in the transformer room for fear of Luo-coil; When said electric furnace was the hot stove in totally-enclosed ore deposit, said at least one group of Luo-coil both can be installed in the transformer room, also can be installed in outside the transformer room.
In addition; In order better the current signal that obtains to be handled; This electric furnace current measurement system can further include: FPGA control circuit PLC (not shown) links to each other with the output terminal of said phase current integrator 13 and/or said line current integrator 15.That is to say that FPGA control circuit PLC can only link to each other with the output terminal of phase current integrator, thereby the phase current of transformer is handled; Also can only link to each other with the output terminal of line current integrator; Thereby the line current to electric furnace is handled, perhaps, and preferably; Can also link to each other with the output terminal of phase current integrator and the output terminal of line current integrator simultaneously, thereby the phase current of transformer and the line current of electric furnace are carried out overall treatment.Above-mentioned processing procedure can comprise multiple implementation, for example, can the form of the current value that obtain with curve map be shown etc. intuitively.
Current measurement system provided by the invention; Cooperate the mode of vectorial addition devices through a plurality of Luo-coils, solved the technical matters that single Luo-coil can't the measuring transformer phase current, and then utilized the transformer phase current; Can accurately draw the line current of electric furnace; Thereby be convenient to the running status that operating personnel understand electric furnace, thereby work such as can overhaul targetedly, thoroughly solved the current measurement problem of unsymmetrical 3.
The present invention also provides a kind of electric furnace current measuring method; Said electric furnace is through at least one power supply mutually of at least one single transformer or three-phase transformer; Wherein, Each of every single transformer or three-phase transformer has top and the end that is made up of one or more conductors mutually, and as shown in Figure 4, this method may further comprise the steps:
S401: top or the terminal conductor current of measuring at least one phase of said at least one single transformer or three-phase transformer through at least one group of Luo-coil respectively; Wherein, Every group of Luo-coil comprises at least one Luo-coil, and the top or the end of a phase of corresponding single transformer of one group of Luo-coil or three-phase transformer.
S402: the conductor current that respectively each Luo-coil in every group of Luo-coil is recorded is carried out the vector summation, is respectively organized the primary vector summed result of Luo-coil.
Particularly; Because the conductor current itself that records is that existing size is directive again, therefore, can regard the conductor current that each Luo-coil records as a vector; Mode according to addition of vectors is sued for peace to the conductor current that each Luo-coil records, and promptly obtains the primary vector summed result.
Wherein, the primary vector summed result can obtain through the primary vector totalizer among Fig. 1 a or Fig. 1 b.
S403: respectively said primary vector summed result is carried out integration, obtain the top or the terminal phase current of at least one phase at least one single transformer or the three-phase transformer.
Wherein, phase current can obtain through the phase current integrator among Fig. 1 a or Fig. 1 b.
Preferable, when said electric furnace was supplied power through three single transformers or a three-phase transformer, the implementation that obtains said primary vector summed result comprised following dual mode:
First kind of mode is: the top and terminal conductor current of measuring each phase of three single transformers or three-phase transformer through six groups of Luo-coils respectively; And the conductor current that each Luo-coil in every group of Luo-coil records is carried out vector sue for peace, obtain the primary vector summed result.
Particularly; This mode can utilize the primary vector totalizer in the electric furnace current measurement system among Fig. 1 a to realize; Be the top and terminal corresponding one group of Luo-coil respectively of each phase of every single transformer or three-phase transformer, that is to say, need measure the top and terminal conductor current of each phase of every single transformer or three-phase transformer respectively; Therefore, need six groups of Luo-coils altogether.Wherein, each Luo-coil in every group of Luo-coil need surround top or all terminal conductors of this phase in this single transformer or the three-phase transformer respectively, omission can not be arranged, and each Luo-coil institute conductor surrounded can not repeat.Carry out the vector summation through the conductor current that each Luo-coil in every group of Luo-coil is recorded, can obtain the primary vector summed result, be i.e. the conductor current sum of all conductors of this top or end.
The second way is: top or the terminal conductor current of measuring each phase of three single transformers or three-phase transformer through three groups of Luo-coils respectively; And the primary vector summed result of the top of each phase of each single transformer that obtains or three-phase transformer or terminal conductor current carried out anti-phase, obtain the primary vector summed result of conductor current at end or top of each phase of said each single transformer or three-phase transformer.
Particularly; This mode can utilize the primary vector totalizer in the electric furnace current measurement system among Fig. 1 b to realize; Promptly only at corresponding one group of Luo-coil in top of each phase of every single transformer or three-phase transformer, perhaps, only at terminal corresponding one group of Luo-coil of each phase of every single transformer or three-phase transformer; That is to say; Only need the top or the terminal conductor current of each phase of every single transformer of measurement or three-phase transformer to get final product, therefore, only need three groups of Luo-coils.Can know according to the principles of electric and electronic engineering, the top of each phase of every single transformer or three-phase transformer and terminal conductor current equal and opposite in direction, in the opposite direction; Therefore; After recording the conductor current at top, only need can obtain terminal conductor current to its anti-phase, vice versa.
Preferable, said electric furnace comprises three electrodes, each electrode respectively with two single transformers or three-phase transformer in two link to each other, shown in Fig. 2 a or Fig. 2 b, at this moment, for the line current of potential electrode, this method is further comprising the steps of:
Respectively the primary vector summed result of the top of adjacent two phases in adjacent two single transformers or the three-phase transformer or terminal conductor current is carried out vector and sue for peace, obtain the secondary vector summed result; Said secondary vector summed result is carried out integration, obtain top or the line current of the terminal electrode that links to each other mutually of adjacent two in adjacent with this two single transformers or the three-phase transformer.Particularly, this step can realize through secondary vector totalizer in the circuital current measuring system shown in Fig. 1 a or Fig. 1 b and line current integrator.
In addition, employed primary vector totalizer, phase current integrator, secondary vector totalizer and line current integrator both can adopt hardware mode to realize among Fig. 1 a and Fig. 1 b, also can adopt software mode to realize, as long as can realize corresponding function.
Current measuring method provided by the invention; Through the measurement result of a plurality of Luo-coils being carried out the mode of vector summation, solved the technical matters that single Luo-coil can't the measuring transformer phase current, and then utilized the transformer phase current; Can accurately draw the line current of electric furnace; Thereby be convenient to the running status that operating personnel understand electric furnace, thereby work such as can overhaul targetedly, thoroughly solved the current measurement problem of unsymmetrical 3.
Though invention has been described for top combination embodiment, to those skilled in the art, it is understandable that the foregoing description should not thought the protection domain that limits the present invention with this only for example purposes.Protection scope of the present invention is only limited by accompanying Claim.In addition; Parts are not limited to realized by hardware fully in the foregoing description; The part parts also can be realized by software or software and hardware combining; For example the part unit is to instruct relevant hardware to accomplish through program, and this program can be stored in the computer read/write memory medium, as: ROM/RAM, magnetic disc, CD etc.Also have, the apparatus structure shown in accompanying drawing or the embodiment only is to schematically show logical organization.The module that wherein shows as separating component maybe or possibly not be physically to separate, and the parts that show as module also possibly be possibly not be physical module perhaps.
In addition, in claims, term " comprises " does not get rid of other parts of existence or step.In addition, although in different claims, comprised each characteristic, these characteristics can be by advantageously combination, and each characteristic is included in the different claims and does not mean that these combination of features are infeasible and/or disadvantageous.In addition, single implication is not got rid of a plurality of.Therefore, the implication of " " etc. is not got rid of a plurality of.
In addition, those skilled in the art can make amendment, change or replace under the prerequisite that does not break away from spirit of the present invention it, and still, the various equivalent variations according to the present invention did still belong to the scope that the present invention is contained.
Claims (13)
1. electric furnace current measurement system; Said electric furnace is through the power supply of single transformer or three-phase transformer, and wherein, one of single transformer or three-phase transformer has top and the end that is made up of one or more conductor mutually; It is characterized in that; Said electric furnace current measurement system comprises: at least one group of Luo-coil, at least one primary vector totalizer and at least one phase current integrator, wherein
Every group of Luo-coil comprises at least one Luo-coil; The output terminal of each Luo-coil links to each other with the input end of a primary vector totalizer respectively in every group of Luo-coil, and the output terminal of each primary vector totalizer links to each other with the input end of a phase current integrator;
The top or the end of one phase of corresponding single transformer of one group of Luo-coil or three-phase transformer, and each Luo-coil of every group of Luo-coil surrounds the top or the terminal conductor of a phase of single transformer or three-phase transformer.
2. electric furnace current measurement system as claimed in claim 1; It is characterized in that; Each Luo-coil in every group of Luo-coil surrounds top or at least one conductor in the terminal conductor of a phase of single transformer or three-phase transformer; Each Luo-coil institute conductor surrounded quantity sum in every group of Luo-coil equals top or the quantity sum of terminal conductor of a phase of a said single transformer or three-phase transformer, and each Luo-coil institute conductor surrounded does not repeat mutually.
3. electric furnace current measurement system as claimed in claim 1; It is characterized in that; When said electric furnace was supplied power through three single transformers or a three-phase transformer, said Luo-coil was six groups, each six of said primary vector totalizer and said phase current integrators; Wherein, the corresponding separately one group of Luo-coil of the top of each phase of each single transformer or three-phase transformer and end.
4. electric furnace current measurement system as claimed in claim 3 is characterized in that, also comprises:
Three secondary vector totalizers and three line current integrators; Wherein, The output terminal of per two primary vector totalizers links to each other with the input end of a secondary vector totalizer respectively, and the output terminal of each secondary vector totalizer links to each other with the input end of a line current integrator respectively.
5. electric furnace current measurement system as claimed in claim 1; It is characterized in that; When said electric furnace was supplied power through three single transformers or a three-phase transformer, said Luo-coil was three groups, each three of then said primary vector totalizer and said phase current integrators; Wherein, Surround one group of Luo-coil on the conductor at the top of each phase of each single transformer or three-phase transformer, perhaps, surround one group of Luo-coil on the conductor of the end of each phase of each single transformer or three-phase transformer.
6. electric furnace current measurement system as claimed in claim 5 is characterized in that, each primary vector totalizer all has two output terminals; Wherein, an output terminal is the forward output terminal, its output valve by each Luo-coil that links to each other with this primary vector totalizer the vector sum of survey electric current; Another output terminal is an inverse output terminal; The vector sum equal and opposite in direction of its output valve and the output of forward output terminal, phase place is opposite
This electric furnace current measurement system also comprises: three secondary vector totalizers and three line current integrators; Wherein, Per two output terminals in six output terminals of said three primary vector totalizers link to each other with the input end of a secondary vector totalizer respectively, and the output terminal of each secondary vector totalizer links to each other with the input end of a line current integrator respectively.
7. electric furnace current measurement system as claimed in claim 1 is characterized in that, when said electric furnace was the hot stove in semiclosed ore deposit, said Luo-coil was installed in the transformer room.
8. electric furnace current measurement system as claimed in claim 1 is characterized in that, when said electric furnace was the hot stove in totally-enclosed ore deposit, said Luo-coil was installed in the transformer room or outside the transformer room.
9. electric furnace current measurement system as claimed in claim 1 is characterized in that, also comprises:
The FPGA control circuit, its output terminal with said phase current integrator links to each other.
10. electric furnace current measurement system as claimed in claim 1 is characterized in that, said electric furnace comprises: the hot stove in ore deposit, electroslag furnace and steel-smelting electric furnace.
11. electric furnace current measuring method; Said electric furnace is through at least one power supply mutually of at least one single transformer or three-phase transformer; Wherein, Each of every single transformer or three-phase transformer has top and the end that is made up of one or more conductors mutually, it is characterized in that this method may further comprise the steps:
Measure the top or the terminal conductor current of at least one phase of said at least one single transformer or three-phase transformer respectively through at least one group of Luo-coil; Wherein, Every group of Luo-coil comprises at least one Luo-coil, and the top or the end of a phase of corresponding single transformer of one group of Luo-coil or three-phase transformer;
The conductor current that respectively each Luo-coil in every group of Luo-coil is recorded is carried out the vector summation, is respectively organized the primary vector summed result of Luo-coil;
Respectively said primary vector summed result is carried out integration, obtain the top or the terminal phase current of at least one phase at least one single transformer or the three-phase transformer.
12. electric furnace current measuring method as claimed in claim 11 is characterized in that, when said electric furnace was supplied power through three single transformers or a three-phase transformer, the implementation that obtains said primary vector summed result comprised:
Measure the top and terminal conductor current of each phase of three single transformers or three-phase transformer through six groups of Luo-coils respectively, and the conductor current that each Luo-coil in every group of Luo-coil records is carried out the vector summation, obtain the primary vector summed result; Perhaps,
Measure the top or the terminal conductor current of each phase of three single transformers or three-phase transformer respectively through three groups of Luo-coils; And the primary vector summed result of the top of each phase of each single transformer that obtains or three-phase transformer or terminal conductor current carried out anti-phase, obtain the primary vector summed result of conductor current at end or top of each phase of said each single transformer or three-phase transformer.
13. electric furnace current measuring method as claimed in claim 12, wherein, said electric furnace comprises three electrodes, each electrode respectively with two single transformers or three-phase transformer in two link to each other, it is characterized in that, further comprising the steps of:
Respectively the primary vector summed result of the top of adjacent two phases in adjacent two single transformers or the three-phase transformer or terminal conductor current is carried out vector and sue for peace, obtain the secondary vector summed result;
Said secondary vector summed result is carried out integration, obtain top or the line current of the terminal electrode that links to each other mutually of adjacent two in adjacent with this two single transformers or the three-phase transformer.
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| CN112858820A (en) * | 2021-01-19 | 2021-05-28 | 苏州工业园区苏容电气有限公司 | Three-phase alternating-current submerged arc furnace low-voltage conductor online service life monitoring system |
| CN114593663A (en) * | 2022-02-23 | 2022-06-07 | 本钢板材股份有限公司 | Refining LF (ladle furnace) slag thickness measuring method based on secondary side current model |
| CN114593663B (en) * | 2022-02-23 | 2023-10-03 | 本钢板材股份有限公司 | Secondary current model-based refining LF slag thickness measurement method |
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