CN107607767B - All-fiber electric furnace transformer low-voltage side heavy current measuring method - Google Patents
All-fiber electric furnace transformer low-voltage side heavy current measuring method Download PDFInfo
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- CN107607767B CN107607767B CN201710707498.9A CN201710707498A CN107607767B CN 107607767 B CN107607767 B CN 107607767B CN 201710707498 A CN201710707498 A CN 201710707498A CN 107607767 B CN107607767 B CN 107607767B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000835 fiber Substances 0.000 title abstract description 7
- 230000003287 optical effect Effects 0.000 claims abstract description 33
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910052802 copper Inorganic materials 0.000 claims abstract description 29
- 239000010949 copper Substances 0.000 claims abstract description 29
- 239000013307 optical fiber Substances 0.000 claims abstract description 23
- 230000010287 polarization Effects 0.000 claims abstract description 10
- 238000004804 winding Methods 0.000 claims abstract description 7
- 238000005259 measurement Methods 0.000 claims abstract description 5
- 238000002347 injection Methods 0.000 claims abstract description 4
- 239000007924 injection Substances 0.000 claims abstract description 4
- 230000009466 transformation Effects 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000003723 Smelting Methods 0.000 abstract description 5
- 238000009434 installation Methods 0.000 abstract description 3
- 238000010891 electric arc Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- Measurement Of Current Or Voltage (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention relates to a method for measuring the current of the low-voltage side of a large-capacity electric furnace transformer of a smelting enterprise, in particular to a method for measuring the large current of the low-voltage side of an all-fiber electric furnace transformer. The method is characterized by comprising the following steps: (1) firstly, selecting all copper pipes with the current on the low-voltage side of the electric furnace transformer as the outflow direction; (2) winding a polarization maintaining optical fiber for current measurement on all copper tubes with current at the low-voltage side of the electric furnace transformer as the outflow direction to form a closed optical loop surrounding all the copper tubes; (3) and respectively connecting the optical signal injection end and the optical signal output end of the polarization maintaining optical fiber with a signal acquisition system, measuring the deflection angle between the input optical signal and the output optical signal, and converting the deflection angle into the current value of the low-voltage side of the electric furnace transformer. The measuring method has the advantages that the measuring method is not influenced by installation environment, magnetic field intensity and super-large current, and can accurately measure and collect the current of the low-voltage side of the electric furnace transformer.
Description
Technical Field
The invention relates to a method for measuring the current of the low-voltage side of a large-capacity electric furnace transformer of a smelting enterprise, in particular to a method for measuring the large current of the low-voltage side of an all-fiber electric furnace transformer.
Background
The submerged arc furnace system of the smelting enterprise widely adopts a direct power supply mode of a transformer-electric arc furnace, namely, after high voltage with voltage levels of 330kV, 220kV, 110kV and the like is reduced by a transformer, current with hundreds of thousands of amperes is provided for the submerged arc furnace to use, so that a special transformer with high current characteristics on a low-voltage side, namely an electric furnace transformer, is required to be adopted.
Compared with a common power transformer, the electric furnace transformer is arranged near an electric arc furnace and is in severe operating environments with high temperature, large dust, strong magnetic field and the like, the low-voltage side of the electric furnace transformer adopts a multi-path guide copper pipe parallel connection output mode, the current of the low-voltage side is large, and the current of the low-voltage side of the electric furnace transformer cannot be measured by an electromagnetic current transformer. The current at the low-voltage side of the electric furnace transformer cannot be measured, so that the electric furnace transformer has defects in protection configuration, and meanwhile, the smelting process is easy to reduce and the energy consumption is too high because the control of the electrodes in the electric furnace cannot measure the accurate current. It is therefore necessary to measure the low side current of the furnace transformer.
Disclosure of Invention
The invention aims to provide a method for measuring the large current on the low-voltage side of an all-fiber electric furnace transformer, which is not influenced by the installation environment, the magnetic field intensity and the ultra-large current, so that the current on the low-voltage side of the electric furnace transformer can be accurately measured and collected.
A full optical fiber electric furnace transformer low-voltage side heavy current measuring method is characterized by comprising the following steps:
(1) firstly, selecting all copper pipes with the current on the low-voltage side of the electric furnace transformer as the outflow direction;
(2) winding a polarization maintaining optical fiber for current measurement on all copper tubes with current at the low-voltage side of the electric furnace transformer as the outflow direction to form a closed optical loop surrounding all the copper tubes;
(3) and respectively connecting the optical signal injection end and the optical signal output end of the polarization maintaining optical fiber with a signal acquisition system, measuring the deflection angle between the input optical signal and the output optical signal, and converting the deflection angle into the current value of the low-voltage side of the electric furnace transformer.
The specific conversion of the current value of the low-voltage side of the electric furnace transformer according to the deflection angle is as follows: firstly, injecting a standard current source with the current of X value into an outlet copper pipe on the low-voltage side of the electric furnace transformer, then measuring the deflection angle delta theta value between an input optical signal and an output optical signal of the polarization-maintaining optical fiber, wherein the delta theta value corresponds to the primary current X value, then measuring the transformation ratio to be X/delta theta, and converting the measured deflection angle into the current value on the low-voltage side of the electric furnace transformer according to the formula.
All copper pipes with the current on the low-voltage side of the electric furnace transformer as the flowing direction are selected as follows: the low-voltage side of the electric furnace transformer is provided with a plurality of parallel windings for output, a plurality of output sleeves correspond to a plurality of guide copper pipes, current flows out from one side of the guide copper pipe at the low-voltage side of the electric furnace transformer and flows back from the other side, and all copper pipes of which the current flows out from one side of the guide copper pipe at the low-voltage side of the electric furnace transformer are selected accordingly.
The method comprises the steps of arranging the polarization maintaining optical fiber on a guide copper pipe of an outgoing line on the low-voltage side of the electric furnace transformer, injecting an optical signal into the optical fiber arranged on the low-voltage side of the electric furnace transformer through a signal acquisition system, acquiring the deflection angle difference between the optical signal transmitted back from the optical fiber and the injected optical signal, and determining the current on the low-voltage side of the electric furnace transformer according to the deflection angle difference. The measuring method has the advantages that the measuring method is not influenced by installation environment, magnetic field intensity and super-large current, and can accurately measure and collect the current of the low-voltage side of the electric furnace transformer.
Drawings
FIG. 1 is a schematic diagram of a method for measuring large current on the low-voltage side of an all-fiber electric furnace transformer.
Detailed Description
A method for measuring and collecting large current on a low-voltage side of an electric furnace transformer based on an all-fiber type comprises the following steps:
(1) and the copper pipe determines the current flowing direction of the low-voltage side of the electric furnace transformer.
(2) A polarization maintaining optical fiber special for current measurement is wound on a copper guide tube in the current flowing direction of the low-voltage side of an electric furnace transformer to form a closed optical loop, and the winding method is shown in figure 1. The solid dots represent the current flowing direction of the guide copper tube outgoing from the low-voltage side of the electric furnace transformer, and the cross represents the current flowing direction. The upper left corner guide copper pipe is used for leading out wires from the head end of a low-voltage side winding of the electric furnace transformer, and the upper right corner is used for leading out wires from the tail end.
(3) The optical signal injection end and the optical signal output end of the optical fiber are connected with a signal acquisition system, and the measurement of the current on the low-voltage side of the electric furnace transformer can be completed by measuring the deflection angle between the input optical signal and the output optical signal.
(4) Injecting a standard current source, for example, 3000A current, into a copper outlet pipe on the low-voltage side of the electric furnace transformer, measuring the deflection angle between the optical signal of the input optical fiber and the optical signal of the output optical fiber to be a value delta theta, wherein the value delta theta corresponds to a primary current 3000A, and the value is a standard value, so that the transformation ratio can be measured to be 3000/delta theta, and the value delta theta corresponding to any current can be measured according to the transformation ratio, and the actual current on the low-voltage side of the electric furnace transformer can be known according to the size of the value delta theta.
Example 1:
taking a certain electric furnace transformer as an example, the incoming line of the high-voltage side of the electric furnace transformer is 110kV, the outgoing line of the low-voltage side of the electric furnace transformer is 70-200V and adjustable, the rated current of the low-voltage side reaches 200000A, and the current of the low-voltage side of the electric furnace transformer cannot be measured by using a conventional electromagnetic measurement method, so that the electric furnace transformer cannot be provided with the differential protection of the electric furnace transformer, and meanwhile, an electric furnace transformer smelting control system cannot obtain accurate electrode current, so that the reduction of the process level and the increase.
In order to solve the problems, after the method is adopted, the electric furnace transformation is continuously taken as an example for analysis, the polarization maintaining optical fiber is wound on a copper pipe from which the current on the low-voltage side of the electric furnace transformer flows out, an optical signal is injected into one end of the optical fiber, the deflection angle of the injected optical signal is recorded, the deflection angle of the returned optical fiber signal is measured at the other end of the wound optical fiber, and the magnitude of the current flowing through the low-voltage side of the electric furnace transformer can be measured through the difference of the two deflection angles. When a 3000A current is injected, the deflection angle between the optical signal of the input optical fiber and the optical signal of the output optical fiber is measured to be a value delta theta, and when the deflection angle is measured to be 10 delta theta, the actual current is 30000A.
Claims (1)
1. A full optical fiber electric furnace transformer low-voltage side heavy current measuring method is characterized by comprising the following steps:
(1) firstly, selecting all copper pipes with the current on the low-voltage side of the electric furnace transformer as the outflow direction;
(2) winding a polarization maintaining optical fiber for current measurement on all copper tubes with current at the low-voltage side of the electric furnace transformer as the outflow direction to form a closed optical loop surrounding all the copper tubes;
(3) respectively connecting an optical signal injection end and an optical signal output end of the polarization maintaining optical fiber with a signal acquisition system, measuring the size of a deflection angle between an input optical signal and an output optical signal, and converting the size of the deflection angle into the current value of the low-voltage side of the electric furnace transformer;
the specific conversion of the current value of the low-voltage side of the electric furnace transformer according to the deflection angle is as follows: firstly, injecting a standard current source with the current of X value into an outlet copper pipe on the low-voltage side of an electric furnace transformer, and then measuring the deflection angle between an input optical signal and an output optical signal of a polarization maintaining optical fiberValue of thenThe value corresponds to the value of the primary current X, and then the transformation ratio is measured asThe measured deflection angle can be converted into the current value of the low-voltage side of the electric furnace transformer;
all copper pipes with the current on the low-voltage side of the electric furnace transformer as the flowing direction are selected as follows: the low-voltage side of the electric furnace transformer is provided with a plurality of parallel windings for output, a plurality of output sleeves correspond to a plurality of guide copper pipes, current flows out from one side of the guide copper pipe at the low-voltage side of the electric furnace transformer and flows back from the other side, and all copper pipes of which the current flows out from one side of the guide copper pipe at the low-voltage side of the electric furnace transformer are selected accordingly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710707498.9A CN107607767B (en) | 2017-08-17 | 2017-08-17 | All-fiber electric furnace transformer low-voltage side heavy current measuring method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710707498.9A CN107607767B (en) | 2017-08-17 | 2017-08-17 | All-fiber electric furnace transformer low-voltage side heavy current measuring method |
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| Publication Number | Publication Date |
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| CN107607767A CN107607767A (en) | 2018-01-19 |
| CN107607767B true CN107607767B (en) | 2019-12-24 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2745196Y (en) * | 2004-09-08 | 2005-12-07 | 特变电工衡阳变压器有限公司 | An outlet structure on low-voltage side of electric furnace transformer |
| JP2009020054A (en) * | 2007-07-13 | 2009-01-29 | Toshiba Corp | Optical current transformer |
| CN201436543U (en) * | 2009-01-05 | 2010-04-07 | 中冶东方工程技术有限公司 | Electric current parameter measuring system for ore smelting stove |
| CN102354953A (en) * | 2011-09-28 | 2012-02-15 | 许继电气股份有限公司 | Electric-cooker transformer relay protecting system and method |
| CN102435813A (en) * | 2011-09-28 | 2012-05-02 | 许继电气股份有限公司 | Method for collecting current on low-voltage side of electric furnace transformer and relay protection device |
| CN204649820U (en) * | 2014-12-31 | 2015-09-16 | 国家电网公司 | A kind of electric furnace electric parameter information acquisition system |
| CN205374716U (en) * | 2016-03-04 | 2016-07-06 | 国网山西省电力公司晋城供电公司 | Three rolls of main balanced alarm device that gain merit that become of intelligence |
-
2017
- 2017-08-17 CN CN201710707498.9A patent/CN107607767B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2745196Y (en) * | 2004-09-08 | 2005-12-07 | 特变电工衡阳变压器有限公司 | An outlet structure on low-voltage side of electric furnace transformer |
| JP2009020054A (en) * | 2007-07-13 | 2009-01-29 | Toshiba Corp | Optical current transformer |
| CN201436543U (en) * | 2009-01-05 | 2010-04-07 | 中冶东方工程技术有限公司 | Electric current parameter measuring system for ore smelting stove |
| CN102354953A (en) * | 2011-09-28 | 2012-02-15 | 许继电气股份有限公司 | Electric-cooker transformer relay protecting system and method |
| CN102435813A (en) * | 2011-09-28 | 2012-05-02 | 许继电气股份有限公司 | Method for collecting current on low-voltage side of electric furnace transformer and relay protection device |
| CN204649820U (en) * | 2014-12-31 | 2015-09-16 | 国家电网公司 | A kind of electric furnace electric parameter information acquisition system |
| CN205374716U (en) * | 2016-03-04 | 2016-07-06 | 国网山西省电力公司晋城供电公司 | Three rolls of main balanced alarm device that gain merit that become of intelligence |
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