CN102435813A - Method for collecting current on low-voltage side of electric furnace transformer and relay protection device - Google Patents
Method for collecting current on low-voltage side of electric furnace transformer and relay protection device Download PDFInfo
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- CN102435813A CN102435813A CN201110296220XA CN201110296220A CN102435813A CN 102435813 A CN102435813 A CN 102435813A CN 201110296220X A CN201110296220X A CN 201110296220XA CN 201110296220 A CN201110296220 A CN 201110296220A CN 102435813 A CN102435813 A CN 102435813A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000004020 conductor Substances 0.000 claims abstract description 10
- 230000001681 protective effect Effects 0.000 claims description 11
- 238000004080 punching Methods 0.000 claims description 4
- 230000003750 conditioning effect Effects 0.000 abstract description 6
- 230000000149 penetrating effect Effects 0.000 abstract 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 16
- 229910052802 copper Inorganic materials 0.000 description 16
- 239000010949 copper Substances 0.000 description 16
- 238000004804 winding Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000010354 integration Effects 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000009183 running Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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Abstract
The invention relates to a method for collecting current on the low-voltage side of an electric furnace transformer and a relay protection device. The relay protection device comprises electronic current sensors penetrating through corresponding terminals of lead conductors in parallel connection between the low-voltage side output terminal of the electric furnace transformer and an electric furnace electrode, wherein the signal output ends of each electronic current sensor are connected with each other in series, and are connected with a signal conditioning unit through a shielded cable. The technical scheme can be used for solving the difficult problems of measuring large current on the low-voltage side of the electric furnace transformer as well as the failing to achieve differential protection of the electric furnace transformer, and can meet the requirement on linearity and large-current unsaturation of differential protection.
Description
Technical field
The present invention relates to the big current acquisition of furnace transformer low-pressure side, transmission, is the basis of realizing the furnace transformer differential protection, belongs to field of relay protection in power.
Background technology
The furnace transformer metallurgical, that chemical industry is used a kind of property and structure; Mostly be Y/ △-11/ △-11 or Y/Y-12/ △-11 mode of connection; High side voltage is 35kV～220kV, and the low-pressure side output voltage is that directly power supply is to the electric arc type electric furnace about 200V, and generation high temperature is smelted ore.
In the electric furnace smelting process of industries such as metallurgy, chemical industry, the size of flame current has determined the characteristic of smelting, and obtain the product of high-quality; Simultaneously can saves energy; Shorten smelting cycle, production has great importance control electrode electric current, so accurate measurement flame current accurately for electric furnace; In order to satisfy differential protection to measuring the electric current linearity and the requirement of electric current degree of unsaturation greatly, sensing element should be able to well reflect actual current one time in addition.
The large capacity electric stove transformer is general to adopt three single transformers to form, and so not only can alleviate its hauled weight, can also become positive triangle to arrange furnace transformer at the scene, makes the short net of three-phase evenly.Transformer sidewall lead-in wire mode will make the length of transformer lead and electric furnace short net reduce, and also reduce reactance and loss accordingly.Distance is very short between furnace transformer low-pressure side lead-in wire copper bar to electric furnace electrode, and the space is narrow and small; The transformer output current reaches the training of ten Wan An, so low-pressure side lead-in wire copper bar adopts the mode of a plurality of cylindrical conductor parallel connection outputs.Based on above reason, step down side can't be installed traditional iron core formula current transformer, and very high greater than the current transformer cost of 8000/5 no-load voltage ratio.
Existing metering system, as measuring on the spot, the mounting points of sensing head has 5～10 meters to the distance of collector.Because voltage is low, distance, the attenuation of every cable is very big, and each sensing head all connects a cable to collector, the scheme that secondary adds up in collector, the measuring error of generation further enlarges.
Summary of the invention
The method and the protective relaying device that the purpose of this invention is to provide a kind of furnace transformer low-pressure side current acquisition carry out current measurement inconvenience, inaccurate problem in order to solve prior art.
In order to realize goal of the invention; Method scheme of the present invention is: a kind of furnace transformer low-pressure side current acquisition method; Between furnace transformer low-pressure side output terminal and electric furnace electrode, all wear electronic current transducer on the end of the same name of each parallelly connected bar leading-in conductor; After the signal output part series connection with each electronic current transducer, insert the signal condition unit of protective relaying device.
The signal output part of said each electronic current transducer all is connected on the shielded cable, and this shielded cable comprises cascade section and span line, and said sensor signal output terminal is connected the cascade section, and said span line is connected to the signal condition unit.
Said electronic current transducer is the Luo-coil sensor.
The signal output part of said Luo-coil sensor is connected with connection-peg/seat, corresponding, be connected with on the said cascade section and each Luo-coil sensor signal output terminal connection-peg/corresponding plug socket/head of seat.
Said Luo-coil sensor be can online dismounting pairs of openings, punching structure.
Device scheme of the present invention is: a kind of furnace transformer protective relaying device; Comprise the electronic current sensor that is used to be located on each bar leading-in conductor end of the same name parallelly connected between furnace transformer low-pressure side output terminal and the electric furnace electrode; The signal output part series connection of each electronic current sensor connects the signal condition unit through shielded cable.
Said shielded cable comprises cascade section and span line; Said sensor signal output terminal is connected the cascade section; Said span line is connected to the signal condition unit, and the output of signal condition unit connects collecting unit, and the output of collecting unit connects said observing and controlling and protected location.
Said electronic current transducer is the Luo-coil sensor.
The signal output part of said Luo-coil sensor is connected with connection-peg/seat, corresponding, be connected with on the said cascade section and each Luo-coil sensor signal output terminal connection-peg/corresponding plug socket/head of seat.
Said Luo-coil sensor be can online dismounting pairs of openings, punching structure.
Production has great importance the exact acquisition flame current for electric furnace, and in order to satisfy differential protection to measuring the electric current linearity and the requirement of electric current degree of unsaturation greatly, sensing element should be able to well reflect actual current one time in addition.So the Luo-coil sensor is optimal selection.Sensor adopts dismountable structure to be convenient to on-the-spot the installation, is convenient to change.The cast of employing High temp. epoxy resins adapts to the requirement of IV level filthy environment and temperature environment.According to the every phase terminal copper bar of furnace transformer number, confirm to use sensing head quantity.Suit pairs of openings structure on every phase transformer low-pressure side winding leads copper bar of the same name based on the Luo-coil sensing head.
Because the low-pressure side electric current is very big, arc furnace electrode and the unpromising Luo-coil current transformer of lead-in wire copper bar provide connection terminal, and producer also can not should protect producer to require to provide connection terminal; The multichannel lead-in wire copper bar parallel connection way of output is adopted in the low-pressure side electric current output of furnace transformer, like Fig. 1.But the furnace transformer low-pressure side winding leads copper bar arrangement mode of different manufacturers is different, have polar end and non-polar end to arrange side by side, like accompanying drawing 2, polar end and non-polar end cross arrangement is also arranged, like accompanying drawing 3.Can find out from Fig. 1-3, be difficult to adopt the whole low-pressure side electric current of measuring of current transformer of Luo-coil principle.In addition, just the current transformer of Luo-coil principle can be installed easily in order to make the transformer that has put into operation when having a power failure, need not to take apart the short net of step down side.Adopt the Luo-coil sensor of demountable structure, can realize being easily installed on every copper bar of step down side lead-in wire, promptly sensing head (sensor) is that branch installs.Yin Duogen lead-in wire copper bar and suit sensing head above that are parallel runnings, need be together in series the output of each sensing head, therefore adopt the cascade screen cable; The cascade screen cable is provided with a plurality of a plurality of aviation terminals corresponding with sensor; After the corresponding grafting of aviation terminal, sensor branch is installed, and the scheme of output series connection; And then the overall measurement of realization low-pressure side electric current, and can guarantee high-acruracy survey.With the big electric current of electronic current mutual inductor energy measurement, and drop to minimum to the serial cable attenuation, guaranteed high-acruracy survey, for realizing that differential protection provides possibility.All guide to the integration conditioner to the output of each sensing head if adopt shielded cable; Being realized adding up by the totalizer in the integration conditioner, (each sensing head all connects a cable to collector; The scheme that secondary adds up in collector); But because of from sensing head to the distance the integration conditioner (5 ~ 10 meters) far away, many cables have increased attenuation (total attenuation is equivalent to the several times of unit cable attenuation), and measuring error is big.
Description of drawings
Fig. 1 is furnace transformer winding schematic diagram and low-pressure side winding leads mode synoptic diagram (a is winding non-polar end lead-in wire copper bar for winding polarity end lead-in wire copper bar, x);
Fig. 2 be low-pressure side winding leads copper bar end homonymy of the same name Pareto diagram (with 6 be example, a1 ~ a6 is a polar end, x1 ~ x6 is a non-polar end);
Fig. 3 is low-pressure side winding leads copper bar polar end and non-polar end cross arrangement figure;
Fig. 4 is an air core coil measuring principle synoptic diagram;
Fig. 5 is an electronic current mutual inductor pairs of openings structure sensing head synoptic diagram of the present invention;
Fig. 6 is that electronic current mutual inductor sensing head of the present invention branch installs, output series connection synoptic diagram;
Fig. 7 is the furnace transformer low-pressure side current acquisition mode of connection synoptic diagram that the present invention proposes.
Embodiment
Below in conjunction with accompanying drawing the present invention is further specified.
Method embodiment
A kind of furnace transformer low-pressure side current acquisition method; Between furnace transformer low-pressure side output terminal and electric furnace electrode, all wear electronic current transducer on the end of the same name of each parallelly connected bar leading-in conductor; After the signal output part series connection with each electronic current transducer, insert the signal condition unit of protective relaying device.
Device embodiment
Like the harvester among Fig. 7, comprise Luo-coil sensor, conditioning unit and collecting unit.The low-pressure side of the every phase of transformer according to the every phase terminal copper bar of furnace transformer number, confirms to use sensing head quantity to the lead-in wire copper bar between the electric furnace electrode.Suit is to the Luo-coil sensor on every phase transformer low-pressure side winding leads copper bar of the same name.The sensor output terminal connects collecting unit through the conditioning unit, carries out integration conditioning, data acquisition, converts into to meet the IEC61850 standard digital signals.Like Fig. 6, in order to reduce measuring error, the signal output part of each sensor is all connected, and is connected to the cascade section of same shielded cable then, and the cascade section is used to be provided with plug connector, and span line is used to be transferred to the conditioning unit.As other embodiments, also can adopt a subtending cable and a transmission cable, subtending cable serial connection transmission cable is connected to the conditioning unit through transmission cable.Realization is carried out the scheme of overall measurement then with the small-signal stack of each sensor.
What adopt here is the Luo-coil sensor, also can adopt the electronic current mutual inductor of other type, like optomagnetic formula mutual inductor etc.
In order further to reduce measuring error, the sensor output interface adopts the aviation terminal, corresponding; The cascade section is provided with the aviation terminal of a plurality of respective sensor output interfaces, and phono plug/seat adopts two cores aviation plug/seat, and cable adopts the double layer screen cable; Two ground connection; Skin also adopts the wax control tightening tube, has guaranteed to adapt to the requirement of IV level filthy environment and temperature environment, and can guarantee the reliability of signal transmission.
The Luo-coil sensor adopts dismountable structure, like sensing head among Fig. 5, adopts two non magnetic skeleton butt joints of semi-ring type to constitute, and is arranged with coil on the skeleton, and integrated poured resistant to elevated temperatures epoxy resin is convenient to on-the-spot the installation, is convenient to change.The High temp. epoxy resins cast adapts to the requirement of IV level filthy environment and temperature environment.
As shown in Figure 4, air core coil is that the lead of even thickness is evenly close on the prismatic non magnetic skeleton of annular and form air core coil.When tested electric current when being positioned at the Primary Conductor in the middle of the air core coil; Because electromagnetic induction; The magnetic field that the time rate of change of electric current in the Primary Conductor
produces can induce electromotive force in coil;
, M is the coefficient of mutual inductance between conductor and the coil.
; U is an air permeability; N is a coil turn; S is the sectional area of air core coil, and R is the radius of air core coil.
Harvester output meet the IEC61850 standard digital signals, be transferred to the observing and controlling and the protected location of far-end through optical-fibre channel.
Claims (10)
1. furnace transformer low-pressure side current acquisition method; It is characterized in that; Between furnace transformer low-pressure side output terminal and electric furnace electrode, all wear electronic current transducer on the end of the same name of each parallelly connected bar leading-in conductor; After the signal output part series connection with each electronic current transducer, insert the signal condition unit of protective relaying device.
2. a kind of furnace transformer low-pressure side current acquisition method according to claim 1; It is characterized in that; The signal output part of said each electronic current transducer all is connected on the shielded cable; This shielded cable comprises cascade section and span line, and said sensor signal output terminal is connected the cascade section, and said span line is connected to the signal condition unit.
3. a kind of furnace transformer low-pressure side current acquisition method according to claim 2 is characterized in that said electronic current transducer is the Luo-coil sensor.
4. a kind of furnace transformer low-pressure side current acquisition method according to claim 3; It is characterized in that; The signal output part of said Luo-coil sensor is connected with connection-peg/seat; Corresponding, be connected with on the said cascade section and each Luo-coil sensor signal output terminal connection-peg/corresponding plug socket/head of seat.
5. a kind of furnace transformer low-pressure side current acquisition method according to claim 3 is characterized in that, said Luo-coil sensor be can online dismounting pairs of openings, punching structure.
6. furnace transformer protective relaying device; It is characterized in that; Comprise the electronic current sensor that is used to be located on each bar leading-in conductor end of the same name parallelly connected between furnace transformer low-pressure side output terminal and the electric furnace electrode; The signal output part series connection of each electronic current sensor connects the signal condition unit through shielded cable.
7. a kind of furnace transformer protective relaying device according to claim 6; It is characterized in that; Said shielded cable comprises cascade section and span line, and said sensor signal output terminal is connected the cascade section, and said span line is connected to the signal condition unit; The output of signal condition unit connects collecting unit, and the output of collecting unit connects said observing and controlling and protected location.
8. a kind of furnace transformer protective relaying device according to claim 7 is characterized in that said electronic current transducer is the Luo-coil sensor.
9. a kind of furnace transformer protective relaying device according to claim 8; It is characterized in that; The signal output part of said Luo-coil sensor is connected with connection-peg/seat; Corresponding, be connected with on the said cascade section and each Luo-coil sensor signal output terminal connection-peg/corresponding plug socket/head of seat.
10. a kind of furnace transformer protective relaying device according to claim 8 is characterized in that, said Luo-coil sensor be can online dismounting pairs of openings, punching structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110296220.XA CN102435813B (en) | 2011-09-28 | 2011-09-28 | A kind of method for collecting current on low-voltage side of electric furnace transformer and protective relaying device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110296220.XA CN102435813B (en) | 2011-09-28 | 2011-09-28 | A kind of method for collecting current on low-voltage side of electric furnace transformer and protective relaying device |
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| CN102435813A true CN102435813A (en) | 2012-05-02 |
| CN102435813B CN102435813B (en) | 2015-11-25 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103245882A (en) * | 2013-04-27 | 2013-08-14 | 国家电网公司 | Integrated power failure indication and condition monitoring device |
| CN103777055A (en) * | 2013-12-03 | 2014-05-07 | 国家电网公司 | Multiple Rogowski coil parallel-connected outer integration sensor |
| CN104037731A (en) * | 2013-11-19 | 2014-09-10 | 国家电网公司 | Large-power rectification transformer set differential protection method |
| CN104215875A (en) * | 2014-09-25 | 2014-12-17 | 国家电网公司 | Monitor method of high power rectifier transformer unit rectifying valve breakdowns |
| CN107607767A (en) * | 2017-08-17 | 2018-01-19 | 国家电网公司 | A kind of all -fiber furnace transformer low-pressure side Super-Current Measurement method |
| CN109425773A (en) * | 2017-08-23 | 2019-03-05 | 维谛技术有限公司 | A kind of current monitoring circuit, method and power supply |
| 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 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103245882A (en) * | 2013-04-27 | 2013-08-14 | 国家电网公司 | Integrated power failure indication and condition monitoring device |
| CN103245882B (en) * | 2013-04-27 | 2015-11-11 | 国家电网公司 | The power failure instruction of integration and state monitoring apparatus |
| CN104037731A (en) * | 2013-11-19 | 2014-09-10 | 国家电网公司 | Large-power rectification transformer set differential protection method |
| CN104037731B (en) * | 2013-11-19 | 2017-02-15 | 国家电网公司 | Large-power rectification transformer set differential protection method |
| CN103777055A (en) * | 2013-12-03 | 2014-05-07 | 国家电网公司 | Multiple Rogowski coil parallel-connected outer integration sensor |
| CN103777055B (en) * | 2013-12-03 | 2016-06-01 | 国家电网公司 | The outer integrator sensor of multiple Luo-coil parallel connection |
| CN104215875A (en) * | 2014-09-25 | 2014-12-17 | 国家电网公司 | Monitor method of high power rectifier transformer unit rectifying valve breakdowns |
| CN107607767A (en) * | 2017-08-17 | 2018-01-19 | 国家电网公司 | A kind of all -fiber furnace transformer low-pressure side Super-Current Measurement method |
| CN107607767B (en) * | 2017-08-17 | 2019-12-24 | 国家电网公司 | All-fiber electric furnace transformer low-voltage side heavy current measuring method |
| CN109425773A (en) * | 2017-08-23 | 2019-03-05 | 维谛技术有限公司 | A kind of current monitoring circuit, method and power supply |
| 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 |
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