CN201184904Y - On-line monitoring device for multipoint earthing of transformer iron core - Google Patents
On-line monitoring device for multipoint earthing of transformer iron core Download PDFInfo
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- CN201184904Y CN201184904Y CNU200720088767XU CN200720088767U CN201184904Y CN 201184904 Y CN201184904 Y CN 201184904Y CN U200720088767X U CNU200720088767X U CN U200720088767XU CN 200720088767 U CN200720088767 U CN 200720088767U CN 201184904 Y CN201184904 Y CN 201184904Y
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Abstract
The utility model discloses a multi-point grounding online monitoring device of a transformer iron core, which comprises a small current sensor, an output signal of the small current sensor is amplified by an amplification circuit, after that, the grounding current of the transformer iron core is obtained through the detection after the filtration by a multi-order filter circuit and further displayed, a coil of an induced iron core coil of the small current sensor is composed of three sections of windings by series connection, and each section of the winding is further composed of at least two layers of windings; shielding layers are sleeved on guide wires of connecting parts for the series connection of the three sections of the windings, and the shielding layer is arranged between the two layers of the windings. The sensor with the iron core coil structure can greatly improve the anti-interference ability of the small current sensor, avoid the impact of an external strong electromagnetic field, further protect the sensitivity and the stability and prolong the service life of the coil.
Description
Technical field
The utility model belongs to the power transformer pick-up unit, is specifically related to a kind of multipoint earthing of iron core of transformer on-Line Monitor Device.
Background technology
Power transformer is the extremely wide electric energy equipment of a kind of application in whole national economy, is the main grid equipment in the power production process.Operating electrical transformer cores must have and have only some reliable grounds, if having or multipoint earthing just to belong to fault at 2.Behind the multipoint earthing of iron core of transformer, can cause the iron core partial short-circuit overheated on the one hand, when serious, can cause the iron core localized burn, lead to the significant trouble of changing the iron core siliconized plate; Because the normal ground wire of iron core produces circulation, cause that the transformer part is overheated on the other hand, also may produce discharge property fault.
The past power department is general to adopt the artificial mode of using clamp on amperemeter regularly to detect to monitor the ground current of iron core grounding extension line.Because have high-intensity magnetic field and highfield to disturb around the transformer that is moving, this detection mode can cause in the data of different angles and measurement of bearing different, the testing staff often can't confirm the accuracy and the authenticity of these measurement data.If we do not have in time to find and handle the situation of multipoint earthing of iron core, just may cause abnormal power failure, serious accidents involving serious consequences such as power-supply unit damage might appear when situation is serious.
At present, the most of operating transformers of China are not all monitored iron core grounding in real time, and show in actual manual inspection: the multipoint earthing of iron core of transformer situation still happens occasionally, and brings many potential safety hazards for normal operation power.At this present situation, based on above analysis, it is necessary to develop a kind of brand-new transformer core ground connection real time on-line monitoring device, and this device is exactly to adopt the method that detects transformer iron core grounding current to judge whether operating transformer exists multipoint earthing.
Nearly ten years relevant data storehouses and reference book are found 5 pieces of relevant " multipoint earthing of iron core on-line measuring device " pertinent literatures by retrieval.xml：namespace?prefix＝o?ns＝″urn：schemas-microsoft-com：office：office″/
Above-mentioned document all is to utilize the output signal of small electric current sensor through after the amplification of amplifying circuit to the multipoint earthing of iron core of transformer on-line monitoring, obtains depressor iron core grounding current and demonstration by detecting after the multistage filtering circuit filtering; The alarm current value is set in also detected signal being compared of having, on the spot light warning and or by the output of switching value interface, realize that the remote live warning waits other function.
The inductive iron core coil precision of the small electric current sensor of above-mentioned detection device is lower, poor anti jamming capability.
Summary of the invention
The purpose of this utility model is to provide a kind of multipoint earthing of iron core of transformer on-Line Monitor Device with the strong small electric current sensor of antijamming capability, to address the above problem.
The technical solution of the utility model is: the multipoint earthing of iron core of transformer on-Line Monitor Device, it comprises small electric current sensor, the output signal of small electric current sensor is through after the amplification of amplifying circuit, obtain transformer iron core grounding current and demonstration by detecting after the multistage filtering circuit filtering, the coil of the inductive iron core coil of described small electric current sensor is made up of three sections windings in series, and every section winding is made up of two-layer at least winding again; Overlap provided with shielding layer on the lead of three sections windings in series connecting portions, establishing screen layer between the two-layer winding.
The iron core of described small electric current sensor adopts super-microcrystalline soft magnetic alloy.
Because the iron-core coil of this sensor adopts the multi-thread common mode of sectional type multilayer around structure, inner each separated time utmost point terminals adopt string and mix and connect, and promptly the multistage windings in series is formed, and every section winding is made up of the multilayer winding again; Layer by layer, add meagre anti-interference screen layer between the utmost point utmost point; The antijamming capability that has improved small electric current sensor so greatly influences with avoiding outside strong-electromagnetic field, further ensures sensitivity and stability, and makes the coil longer service life.
Description of drawings
Fig. 1 multipoint earthing of iron core of transformer on-Line Monitor Device theory diagram.
The inductive iron core coil winding synoptic diagram of Fig. 2 small electric current sensor.
The inductive iron core coil section synoptic diagram of Fig. 3 small electric current sensor.
Embodiment
The circuit structure and the principle of present embodiment multipoint earthing of iron core of transformer on-Line Monitor Device are identical with above-mentioned theory structure.As shown in Figure 1, the output signal of small electric current sensor is through after the amplification of amplifying circuit, obtain depressor iron core grounding current and demonstration by detecting after the multistage filtering circuit filtering, also have 100mA, 300mA, 500mA light warning and three switching value interface outputs on the spot in the present embodiment respectively, this interface can be used for the remote live warning and waits other function.
Core of the present utility model is the new design to small electric current sensor inductive iron core coil.As shown in Figure 2, coiling 2 on the iron core 1, and coil 2 is composed in series by three sections winding 2-1,2-2,2-3, cover provided with shielding layer 7 on the lead junction 3,4,5,6 of series connection; The lead of series connection is covered in the screen layer 7 fully also provided with shielding layer on the two poles of the earth 8,9 of drawing.As shown in Figure 3, every section winding is made up of two-layer at least winding again; Present embodiment adopts the double-layer structure of internal layer winding 10 and outer winding 11; Internal layer winding 10 and outer winding 11 also are provided with screen layer 14.Wherein 15 be iron-core coil once.
The iron core of inductive iron core coil adopts super-microcrystalline soft magnetic alloy promptly to adopt Fe-Ni base amorphous alloy, ultracrystallite (nanocrystalline) magnetically soft alloy to make annealed processing; It has the initial magnetic permeability close with permalloy and temperature stability and littler proportion and lamination coefficient, and is under the identical condition of core dimensions, performance, lower than weight lighter (light approximately 1/3), the price of permalloy iron core.This sensor measurement scope 1mA-20A, precision: 1%; Overload capacity is 100A, long-term 50A in short-term.Performance reaches the sampling of finishing measurement data under on-the-spot high-intensity magnetic field and the highfield interference exactly fully after testing.
Claims (2)
1, a kind of multipoint earthing of iron core of transformer on-Line Monitor Device, it comprises small electric current sensor, the output signal of small electric current sensor is through after the amplification of amplifying circuit, obtain depressor iron core grounding current and demonstration by detecting after the multistage filtering circuit filtering, the coil that it is characterized in that the inductive iron core coil of described small electric current sensor is made up of three sections windings in series, and every section winding is made up of two-layer at least winding again; Overlap provided with shielding layer on the lead of three sections windings in series connecting portions, establishing screen layer between the two-layer winding.
2, multipoint earthing of iron core of transformer on-Line Monitor Device according to claim 1 is characterized in that the iron core of described small electric current sensor adopts super-microcrystalline soft magnetic alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720088767XU CN201184904Y (en) | 2007-12-06 | 2007-12-06 | On-line monitoring device for multipoint earthing of transformer iron core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720088767XU CN201184904Y (en) | 2007-12-06 | 2007-12-06 | On-line monitoring device for multipoint earthing of transformer iron core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201184904Y true CN201184904Y (en) | 2009-01-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200720088767XU Expired - Fee Related CN201184904Y (en) | 2007-12-06 | 2007-12-06 | On-line monitoring device for multipoint earthing of transformer iron core |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201184904Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101615497B (en) * | 2009-05-20 | 2012-05-23 | 北京华电云通电力技术有限公司 | Integral connecting structure of transformer and current sensor |
| CN103155057A (en) * | 2010-10-04 | 2013-06-12 | Abb技术有限公司 | Multifunctional measuring device |
-
2007
- 2007-12-06 CN CNU200720088767XU patent/CN201184904Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101615497B (en) * | 2009-05-20 | 2012-05-23 | 北京华电云通电力技术有限公司 | Integral connecting structure of transformer and current sensor |
| CN103155057A (en) * | 2010-10-04 | 2013-06-12 | Abb技术有限公司 | Multifunctional measuring device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090121 Termination date: 20100106 |