CN110568305A - Iron core and clamp grounding current monitoring device for extra-high voltage converter transformer - Google Patents
Iron core and clamp grounding current monitoring device for extra-high voltage converter transformer Download PDFInfo
- Publication number
- CN110568305A CN110568305A CN201910925467.XA CN201910925467A CN110568305A CN 110568305 A CN110568305 A CN 110568305A CN 201910925467 A CN201910925467 A CN 201910925467A CN 110568305 A CN110568305 A CN 110568305A
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- box body
- iron core
- current sensor
- converter
- signal processor
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000012806 monitoring device Methods 0.000 title claims abstract description 13
- 238000009434 installation Methods 0.000 claims abstract description 19
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 238000004458 analytical method Methods 0.000 claims abstract description 7
- 238000004364 calculation method Methods 0.000 claims abstract description 4
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000009421 internal insulation Methods 0.000 abstract description 2
- 239000010802 sludge Substances 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 abstract 2
- 230000008021 deposition Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention discloses an iron core and clamp grounding current monitoring device for an extra-high voltage converter transformer, which comprises a current sensor, a modulation circuit, a filter circuit, an amplifying circuit, an A/D converter, a digital signal processor and a communicator which are connected in sequence, and further comprises an installation box body and an installation plate, wherein the current sensor and the installation box body are fixed on the same side of the installation plate, the current sensor is arranged at the top of the installation box body, the modulation circuit, the filter circuit, the amplifying circuit, the A/D converter and the digital signal processor are all positioned in the installation box body, and the digital signal processor carries out digital filtering, FFT calculation and harmonic analysis on a result obtained after analog signal conversion and uploads the final result. The invention can monitor the insulation condition of the equipment in real time, can monitor the insulation state of the equipment, can timely find faults of damp or damaged internal insulation, multipoint grounding of an iron core, foreign matters in a box body, oil sludge deposition of an oil tank and the like, can early prevent and treat accidents, has reasonable structural design, and is convenient to install, debug and maintain.
Description
Technical Field
the invention relates to real-time monitoring of current grounding of an iron core and a clamp of an extra-high voltage converter transformer in the power industry, in particular to a device for monitoring grounding current of the iron core and the clamp for the extra-high voltage converter transformer.
Background
When two or more points of an iron core of a power transformer are grounded, circulation current can be generated in the iron core to cause local overheating, the iron core can be locally burnt in serious conditions, even an earthing strip is fused to cause potential suspension of the iron core, a discharge fault is generated, and reliable operation of the transformer is seriously threatened, so that the real-time monitoring of grounding currents of the iron core and clamping pieces of the transformer is very important in the operation process of the transformer. The traditional method adopts a hand-held clamp ammeter similar to that described in CN107247172A, CN107219381A, CN109387684A and the like to measure the grounding current, and has the defects that the grounding current is easily interfered by a power frequency magnetic field and cannot be monitored on line in real time. In addition, the existing monitoring device is unreasonable in installation structure design and inconvenient to use, debug and maintain.
Disclosure of Invention
In view of the above, the present invention provides an iron core and a clamp grounding current monitoring device for an extra-high voltage converter transformer, so as to solve the defects in the prior art.
In order to achieve the purpose, the invention is realized by the following technical scheme:
The utility model provides an iron core and folder ground current monitoring devices that extra-high voltage converter became used, wherein, including current sensor, modulation circuit, filter circuit, amplifier circuit, AD converter, digital signal processor and the communicator that connects gradually, still include installation box body and mounting panel, current sensor and the installation box body all are fixed in the same one side of mounting panel and current sensor locates the top of installation box body, modulation circuit, filter circuit, amplifier circuit, AD converter and digital signal processor all are located the installation box body, digital signal processor includes digital filter, current sensor changes the ground current signal on iron core and the folder into voltage signal, through modulation circuit, filter circuit, amplifier circuit send the signal to the AD converter carries out analog signal's conversion, the converted result is sent to the digital signal processor for digital filtering, FFT calculation and harmonic analysis, and the final sampling data and the analysis result are uploaded to a remote control room through the communicator.
Above-mentioned iron core and folder ground current monitoring devices that extra-high voltage converter became usefulness, wherein, the installation box body includes preceding capping and the back capping of detachable connection, the mounting panel with the both sides of current sensor's junction are equipped with fixed pterygoid lamina respectively.
The iron core and clamp grounding current monitoring device for the extra-high voltage converter transformer is characterized in that the analog filtering isolation technology is used for eliminating series mode interference and common mode interference before the current sensor collects grounding current signals.
The technical scheme of the invention has the beneficial effects that:
The insulating condition that can real time monitoring equipment, the insulating condition that can supervisory equipment and in time discover that internal insulation wets or is impaired, iron core multiple spot ground connection, foreign matter in the box, oil tank sludge deposit etc. trouble, accomplish early prevention early processing to the accident, structural design is reasonable, easy to assemble debugging and maintenance.
drawings
FIG. 1 is a schematic block diagram of the principles of the present invention;
FIG. 2 is a schematic structural view of the present invention;
Fig. 3 is a schematic view of an application scenario of the present invention.
Detailed Description
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Referring to fig. 1, 2 and 3, the iron core and clip grounding current monitoring device for the ultra-high voltage converter of the invention comprises a current sensor 1, a modulation circuit 2, a filter circuit 3, an amplification circuit 4, an a/D converter 5, a digital signal processor 6 and a communicator 7 which are connected in sequence, wherein the a/D converter 5 is a 16-bit high-speed a/D converter, the device also comprises a mounting box body 8 and a mounting plate 9, the current sensor 1 and the mounting box body 8 are both fixed on the same side of the mounting plate 9, the current sensor 1 is arranged at the top of the mounting box body 8, the modulation circuit 2, the filter circuit 3, the amplification circuit 4, the a/D converter 5 and the digital signal processor 6 are all positioned in the mounting box body 8, the digital signal processor 6 comprises a digital filter, the current sensor 1 converts grounding current signals on the iron core and the clip into voltage signals, the signals are transmitted to an A/D converter 5 through a modulation circuit 2, a filter circuit 3 and an amplifying circuit 4 to be converted into analog signals, the converted results are transmitted to a digital signal processor 6 to be subjected to digital filtering, FFT calculation and harmonic analysis, and finally sampling data and analysis results are uploaded to a remote control room through a communicator 7.
The mounting box body 8 comprises a front cover face and a rear cover face which are detachably connected, and two sides of the joint of the mounting plate 9 and the current sensor 1 are respectively provided with a fixed wing plate 10. Before the current sensor 1 collects a grounding current signal, the analog filtering isolation technology is used for eliminating the series mode interference and the common mode interference. In fig. 3, 11 denotes a clip, 12 denotes a core, and an insulating layer 13 is provided between the clip and the core, and the coil portions of a and B are marked as current monitoring portions.
During installation, whether the size of a base reserved for installing the iron core for the extra-high voltage converter transformer and the clamp grounding current monitoring device is matched with a sensor fixing opening or not is checked, and the iron core and the clamp grounding current monitoring device are fixed by 4M 5 screws. The iron core (clamping piece) grounding lead is penetrated into the center hole of the sensor, and then the grounding lead is reliably grounded according to the standard of a transformer manufacturer.
The invention adopts a special analog filtering isolation technology to eliminate the series mode interference and the common mode interference before sampling, so that the sampling signal is clean and real, the error caused by the interference is reduced, the detection function can monitor the grounding current value of the transformer iron core on line in real time, the alarm is automatically given when the grounding current value exceeds the set alarm value, and the alarm is stopped after the fault disappears.
while the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (3)
1. An iron core and clamping piece grounding current monitoring device for an extra-high voltage converter is characterized by comprising a current sensor, a modulation circuit, a filter circuit, an amplifying circuit, an A/D converter, a digital signal processor and a communicator which are connected in sequence, and further comprising an installation box body and an installation plate, wherein the current sensor and the installation box body are fixed on the same side of the installation plate, the current sensor is arranged at the top of the installation box body, the modulation circuit, the filter circuit, the amplifying circuit, the A/D converter and the digital signal processor are all arranged in the installation box body, the digital signal processor comprises a digital filter, the current sensor converts grounding current signals on the iron core and the clamping piece into voltage signals, and the signals are sent to the A/D converter through the modulation circuit, the filter circuit and the amplifying circuit to be converted into analog signals, the converted result is sent to the digital signal processor for digital filtering, FFT calculation and harmonic analysis, and the final sampling data and the analysis result are uploaded to a remote control room through the communicator.
2. An iron core and clip grounding current monitoring device for extra-high voltage converter transformer as claimed in claim 1, wherein said mounting box body comprises a front cover surface and a rear cover surface which are detachably connected, and two sides of the connection of said mounting plate and said current sensor are respectively provided with a fixing wing plate.
3. An apparatus for monitoring the grounding current of iron core and clamping unit for UHV converter as claimed in claim 1, wherein the analog filtering isolation technique is used to eliminate the series mode interference and common mode interference before the current sensor collects the grounding current signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910925467.XA CN110568305A (en) | 2019-09-27 | 2019-09-27 | Iron core and clamp grounding current monitoring device for extra-high voltage converter transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910925467.XA CN110568305A (en) | 2019-09-27 | 2019-09-27 | Iron core and clamp grounding current monitoring device for extra-high voltage converter transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110568305A true CN110568305A (en) | 2019-12-13 |
Family
ID=68782921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910925467.XA Pending CN110568305A (en) | 2019-09-27 | 2019-09-27 | Iron core and clamp grounding current monitoring device for extra-high voltage converter transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110568305A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111701180A (en) * | 2020-07-07 | 2020-09-25 | 国网安徽省电力有限公司电力科学研究院 | UHV converter noise reduction device with both automatic pressure relief and high temperature fuse functions |
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|---|---|---|---|---|
| CN101801136A (en) * | 2010-03-17 | 2010-08-11 | 上海大学 | High-efficiency LED constant current driving circuit |
| CN202258698U (en) * | 2011-10-18 | 2012-05-30 | 浙江凯能实业有限公司 | Fixing structure of iron core of dry type rectifier transformer for variable frequency speed regulation |
| CN202258697U (en) * | 2011-10-18 | 2012-05-30 | 浙江凯能实业有限公司 | Support structure of dry type frequency-variable and speed-control rectifier transformer |
| CN102650654A (en) * | 2012-05-14 | 2012-08-29 | 云南电力试验研究院（集团）有限公司电力研究院 | Operation performance on-line assessment method for power transformer iron core and clamping piece grounding current monitoring device |
| CN102752929A (en) * | 2012-06-28 | 2012-10-24 | 上海大学 | High-power factor LED (light-emitting diode) driving circuit supporting silicon controlled rectifier dimming |
| CN202839241U (en) * | 2012-08-27 | 2013-03-27 | 伊川县电业局 | Shock absorption device used for transformer core |
| CN103163364A (en) * | 2013-03-21 | 2013-06-19 | 辽宁省电力有限公司电力科学研究院 | Wireless monitoring device and monitoring method for grounding current of transformer core/clamp |
| CN203250625U (en) * | 2013-03-29 | 2013-10-23 | 天津市特变电工变压器有限公司 | Mine flameproof type dry-type amorphous alloy iron core transformer with oval outer shell |
| CN108562780A (en) * | 2017-12-26 | 2018-09-21 | 杭州柯林电气股份有限公司 | A kind of iron core and clamp earthing current online monitoring system of electrical equipment |
| CN109085451A (en) * | 2018-08-30 | 2018-12-25 | 国网北京市电力公司 | The detection method and device of iron core grounding in transformer, storage medium |
-
2019
- 2019-09-27 CN CN201910925467.XA patent/CN110568305A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101801136A (en) * | 2010-03-17 | 2010-08-11 | 上海大学 | High-efficiency LED constant current driving circuit |
| CN202258698U (en) * | 2011-10-18 | 2012-05-30 | 浙江凯能实业有限公司 | Fixing structure of iron core of dry type rectifier transformer for variable frequency speed regulation |
| CN202258697U (en) * | 2011-10-18 | 2012-05-30 | 浙江凯能实业有限公司 | Support structure of dry type frequency-variable and speed-control rectifier transformer |
| CN102650654A (en) * | 2012-05-14 | 2012-08-29 | 云南电力试验研究院（集团）有限公司电力研究院 | Operation performance on-line assessment method for power transformer iron core and clamping piece grounding current monitoring device |
| CN102752929A (en) * | 2012-06-28 | 2012-10-24 | 上海大学 | High-power factor LED (light-emitting diode) driving circuit supporting silicon controlled rectifier dimming |
| CN202839241U (en) * | 2012-08-27 | 2013-03-27 | 伊川县电业局 | Shock absorption device used for transformer core |
| CN103163364A (en) * | 2013-03-21 | 2013-06-19 | 辽宁省电力有限公司电力科学研究院 | Wireless monitoring device and monitoring method for grounding current of transformer core/clamp |
| CN203250625U (en) * | 2013-03-29 | 2013-10-23 | 天津市特变电工变压器有限公司 | Mine flameproof type dry-type amorphous alloy iron core transformer with oval outer shell |
| CN108562780A (en) * | 2017-12-26 | 2018-09-21 | 杭州柯林电气股份有限公司 | A kind of iron core and clamp earthing current online monitoring system of electrical equipment |
| CN109085451A (en) * | 2018-08-30 | 2018-12-25 | 国网北京市电力公司 | The detection method and device of iron core grounding in transformer, storage medium |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111701180A (en) * | 2020-07-07 | 2020-09-25 | 国网安徽省电力有限公司电力科学研究院 | UHV converter noise reduction device with both automatic pressure relief and high temperature fuse functions |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191213 |
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| RJ01 | Rejection of invention patent application after publication |