CN202093120U - Compound sensor for core grounding current and partial discharge signals of transformer - Google Patents
Compound sensor for core grounding current and partial discharge signals of transformer Download PDFInfo
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- CN202093120U CN202093120U CN2011201573708U CN201120157370U CN202093120U CN 202093120 U CN202093120 U CN 202093120U CN 2011201573708 U CN2011201573708 U CN 2011201573708U CN 201120157370 U CN201120157370 U CN 201120157370U CN 202093120 U CN202093120 U CN 202093120U
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- transformer
- mutual inductor
- current transformer
- bnc
- current mutual
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Abstract
A compound sensor for core grounding current and partial discharge signals of a transformer belongs to the technical field of detection. The compound sensor adopts the technical scheme that the sensor consists of a shielding case body, a broadband current transformer, a power frequency current mutual inductor, a capacitor, an inductor and a BNC (bayonet nut connector), wherein the broadband current transformer and the power frequency current mutual inductor are coaxially arranged in the shielding case body; the BNC is arranged on the shielding case body; the common end of the broadband current transformer and the power frequency current mutual inductor is connected with an external electrode of the BNC; and the signal output ends of the broadband current transformer and the power frequency current mutual inductor are respectively connected with a center electrode of the BNC through the capacitor and the inductor. In the compound sensor, the broadband current transformer and the power frequency current mutual inductor are respectively used for acquiring the partial discharge and core multipoint grounding signals; the capacitor and the inductor are used for eliminating interference between the two signals which are coupled into one line for transmission; therefore, the installation and operation of the sensor are greatly simplified, and the working efficiency of site installation and debugging is improved.
Description
Technical field
The utility model relates to a kind of compound transducer that can detect transformer partial discharge signal and iron core grounding electric current simultaneously, belongs to the detection technique field.
Background technology
Shelf depreciation and multipoint earthing unshakable in one's determination are two kinds of most common failures of transformer, all can cause serious harm to transformer, therefore, accurately and timely diagnose two kinds of faults and adopt vigorous measures, and be significant for the safe and stable operation of system.When the transformer core multipoint earthing, form a closed-loop path by unshakable in one's determination and ground path between per two earth points, wherein the magnetic flux of interlinkage will induce circulation in the loop, make local overheating unshakable in one's determination, can cause localized burn when serious.Utilize ground current in the power current mutual inductor monitoring iron core grounding line can obtain the iron core grounding failure message of transformer.There is electric capacity between transformer coil and the iron core, when the inner generation of transformer shelf depreciation, discharge signal can evoke electric current by this electric capacity in the iron core grounding line, this fault can utilize the wide band current transformer that is installed on the iron core grounding line to monitor.At present, the wide band current transformer and the iron core grounding mutual inductor that are used to monitor shelf depreciation and multipoint earthing fault unshakable in one's determination are two sensors independent of each other, and the two is installed respectively, wiring respectively, operate more loaded down with trivial details, the effort of taking a lot of work.If only just can monitor these two kinds of faults simultaneously with a kind of sensor, the fitting operation of sensor is bound to simplify greatly, improve the work efficiency of on-the-spot Installation and Debugging, but this therebetween the mutual interference problem between two kinds of signals then can hinder the realization of this technical scheme.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of transformer core ground current and office's discharge signal compound sensor that can monitor two kinds of fault-signals simultaneously is provided.
Problem described in the utility model realizes with following technical proposals:
A kind of transformer core ground current and office's discharge signal compound sensor, form by shield shell, wide band current transformer, power current mutual inductor, electric capacity, inductance and BNC head, described wide band current transformer and power current mutual inductor are coaxially installed in the shield shell, described BNC head is installed on the shield shell, the external electrode of the public termination BNC head of wide band current transformer and power current mutual inductor, signal output part connect the central electrode of BNC head respectively through electric capacity, inductance.
Above-mentioned transformer core ground current and office's discharge signal compound sensor are provided with clearance for insulation between described wide band current transformer and the power current mutual inductor.
Above-mentioned transformer core ground current is fixed on the interior circuit board of shield shell with office's discharge signal compound sensor, described electric capacity and inductance.
The utility model utilizes wide band current transformer and power current mutual inductor to gather shelf depreciation and multipoint earthing signal unshakable in one's determination respectively, utilize electric capacity and inductance to eliminate two kinds of interference between signals, and two kinds of signals are coupled to the transmission of the same line road, simplify the fitting operation of sensor greatly, improved the work efficiency of on-the-spot Installation and Debugging.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further specified.
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is an electrical schematic diagram.
Each label is among the figure: 1, shield shell; 2, circuit board; CT1, wide band current transformer; CT2, power current mutual inductor; C, electric capacity; L, inductance; BNC, terminal pin.
Embodiment
Referring to Fig. 1, the utility model is made up of shield shell 1, power current mutual inductor CT2, BNC head, circuit board 2, wide band current transformer CT1, capacitor C, inductance L.Shield shell 1 adopts the material with strong conductive magneto-conductive to make, and wide band current transformer CT1 and power current mutual inductor CT2 are assemblied in the shield shell 1 simultaneously.Shield shell 1 is made up of two ring grooves that snap together, difference installing broad-band belt current mutual inductor and power current mutual inductor in two ring grooves, the ring groove inwall is lower than outer wall slightly, the inwall of two ring grooves does not conduct electricity contact when snapping together, both guarantee advantages of favorable electromagnetic shielding effect, avoided the mutual inductor secondary circuit short-circuit again.The signal of wide band current transformer CT1 and power current mutual inductor CT2 is drawn by a BNC head.
Referring to Fig. 2, the signal output part of wide band current transformer CT1 links to each other with capacitor C, and the signal output part of power current mutual inductor CT2 links to each other with inductance L, and C and L draw by the BNC head.The ground wire of wide band current transformer CT1 links to each other with the ground wire of power current mutual inductor CT2, is connected to then on BNC the outer wall.The capacitor C that links to each other with wide band current transformer CT1 output terminal can be eliminated the interference of the low frequency signal that power current mutual inductor CT2 sends.Equally, the low frequency inductance L that links to each other with power current mutual inductor CT2 output terminal can be eliminated the interference of the high-frequency signal that wide band current transformer CT1 sends.The signal that two mutual inductors send separates in the transformer outside after the BNC head is drawn.
Claims (3)
1. a transformer core ground current and office's discharge signal compound sensor, it is characterized in that, it is by shield shell (1), wide band current transformer (CT1), power current mutual inductor (CT2), electric capacity (C), inductance (L) and BNC head are formed, described wide band current transformer (CT1) and power current mutual inductor (CT2) are coaxially installed in the shield shell (1), described BNC head is installed on the shield shell (1), the external electrode of the public termination BNC head of wide band current transformer (CT1) and power current mutual inductor (CT2), the signal output part of described wide band current transformer (CT1) and power current mutual inductor (CT2) is respectively through electric capacity (C), inductance (L) connects the central electrode of BNC head.
2. according to the described transformer core ground current of claim 1 and office's discharge signal compound sensor, it is characterized in that, be provided with clearance for insulation between described wide band current transformer (CT1) and the power current mutual inductor (CT2).
3. according to claim 1 or 2 described transformer core ground currents and office's discharge signal compound sensor, it is characterized in that described electric capacity (C) and inductance (L) are fixed on the interior circuit board (2) of shield shell (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201573708U CN202093120U (en) | 2010-12-31 | 2011-05-17 | Compound sensor for core grounding current and partial discharge signals of transformer |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020694479 | 2010-12-31 | ||
| CN201020694479.0 | 2010-12-31 | ||
| CN2011201573708U CN202093120U (en) | 2010-12-31 | 2011-05-17 | Compound sensor for core grounding current and partial discharge signals of transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202093120U true CN202093120U (en) | 2011-12-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201573708U Expired - Fee Related CN202093120U (en) | 2010-12-31 | 2011-05-17 | Compound sensor for core grounding current and partial discharge signals of transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202093120U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108281269A (en) * | 2018-01-31 | 2018-07-13 | 国网上海市电力公司 | A kind of current conversion station direct current detection mutual inductor |
| CN111157859A (en) * | 2020-01-14 | 2020-05-15 | 杭州巨骐信息科技股份有限公司 | Small current electricity taking composite sensor |
| CN116068247A (en) * | 2023-03-22 | 2023-05-05 | 国网江苏省电力有限公司常州供电分公司 | Rogowski coil type current sensor |
-
2011
- 2011-05-17 CN CN2011201573708U patent/CN202093120U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108281269A (en) * | 2018-01-31 | 2018-07-13 | 国网上海市电力公司 | A kind of current conversion station direct current detection mutual inductor |
| CN108281269B (en) * | 2018-01-31 | 2020-06-05 | 国网上海市电力公司 | Converter station direct current detection mutual inductor |
| CN111157859A (en) * | 2020-01-14 | 2020-05-15 | 杭州巨骐信息科技股份有限公司 | Small current electricity taking composite sensor |
| CN116068247A (en) * | 2023-03-22 | 2023-05-05 | 国网江苏省电力有限公司常州供电分公司 | Rogowski coil type current sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111228 Termination date: 20190517 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |