CN205280857U - Insulating leakage current on -line monitoring circuit of power equipment - Google Patents
Insulating leakage current on -line monitoring circuit of power equipment Download PDFInfo
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- CN205280857U CN205280857U CN201520957223.7U CN201520957223U CN205280857U CN 205280857 U CN205280857 U CN 205280857U CN 201520957223 U CN201520957223 U CN 201520957223U CN 205280857 U CN205280857 U CN 205280857U
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Abstract
The utility model discloses an insulating electric current on -line monitoring circuit of revealing of power equipment, include: current -guiding ring, drainage line, single circle punching current transformer, signal conditioning circuit, central processing unit, current -guiding ring is connected through drainage line and single circle punching current transformer input, and single circle punching current transformer output is connected with the signal conditioning circuit input, and the signal conditioning circuit output is connected with central processing unit, current -guiding ring is used for revealing the single circle punching current transformer of current injection, single circle punching current transformer is used for keeping apart and enlargeing revealing the electric current, signal conditioning circuit is used for becoming level signal with the current switchover of single circle punching current transformer output, central processing unit carries out real -time processing, analysis and early warning according to the level signal of signal conditioning circuit output. This on -line monitoring circuit can automatic acquisition, processing, storage, judgement insulator reveal the electric current, can effectively monitor low -voltage grade power equipment and reveal the electric current condition.
Description
Technical field
The utility model relates to power system on-line monitoring technique field, is specifically related to a kind of power equipment insulation and reveals electric current on-line monitoring circuit.
Background technology
Along with the development of electric power digital, intellectualized technology, by real time on-line monitoring power equipment state of insulation, it is achieved prediction and diagnosis to its fault seem particularly important. On the current technology, the method revealing current monitoring for 110 kilovolts and the insulation of above voltage levels power equipment is more, to 35 kilovolts and following voltage range, due to the reason that voltage range reduction power equipment leakage electric current reduces thereupon, adding the impact of electromagnetic interference, corresponding monitoring equipment is less, Monitoring techniques is still immature.
Practical novel content
For solving the problem, the utility model provides a kind of suitable type power equipment insulation to reveal electric current on-line monitoring circuit, reveals, by the insulation of Real-Time Monitoring power equipment, prediction, the diagnosis that electric current realizes the monitoring to equipment running status and fault.
The technical solution of the utility model is: electric current on-line monitoring circuit is revealed in a kind of power equipment insulation, comprising: drainage ring, drainage line, current transformer with single-turn cored structure, signal conditioning circuit, central processing unit;
Described drainage ring is connected with current transformer with single-turn cored structure input terminus by drainage line, and described current transformer with single-turn cored structure output terminal is connected with signal conditioning circuit input terminus, and described signal conditioning circuit output terminal is connected with central processing unit;
Described drainage ring will be for revealing electric current introducing current transformer with single-turn cored structure;
Described current transformer with single-turn cored structure is used for leakage electric current is isolated and amplified;
Described signal conditioning circuit is used for the electric current by current transformer with single-turn cored structure exports and converts level signal to;
Described central processing unit carries out according to the level signal that signal conditioning circuit exports processing in real time, analyzing and early warning.
Further, described signal conditioning circuit comprises: sampling resistance, amplification circuit, filtering circuit; Described sampling resistance is connected with current transformer with single-turn cored structure output terminal, and described sampling resistance converts the electric current that current transformer with single-turn cored structure exports to voltage signal and exports to amplification circuit; Described amplification circuit output end is connected with filtering circuit input terminus; Described filtering circuit output terminal is connected with central processing unit.
Further, described amplification circuit is that two-stage amplifies circuit.
Further, two-stage amplifies the first step amplification employing AD620 amplifier of circuit.
Further, two-stage amplifies the second stage amplification employing OP27 operational amplifier of circuit.
Further, filtering circuit adopts fourth order low-pass wave filter.
Further, also comprise: isolation circuit; The input terminus of described isolation circuit is connected with signal conditioning circuit output terminal, and the output terminal of isolation circuit is connected with central processing unit; Described isolation circuit is the isolation circuit of Digital and analog.
Further, described isolation circuit select gain be 1 isolation operational amplifier ISO124.
Further, central processing unit is microprocessor or industrial computer.
Electric current on-line monitoring circuit is revealed in the power equipment insulation that the utility model provides, leakage electric current is incorporated into single-turn cored structure formula current sense device by drainage line by drainage ring, carry out tentatively isolation and amplify, signal conditioning circuit is changed by current/voltage, amplify the level signal with filtering, the electric current signal of single-turn cored structure formula current sense device output terminal being turned into central processing unit and can sampling, isolation circuit is isolation digitally and in analog, it is arranged between signal conditioning circuit and central processing unit, to protect central processing unit, central processing unit is responsible for sampling signal after signal conditioning circuit amplification filtering and is processed in real time, analyze and early warning. wherein adopt single-turn cored structure formula current sense device, select the material of high permeability as iron core, be mutually coupled by magneticinduction, can effectively extract the insulated leakage current that electric current is 1 �� A ~ 1mA, meanwhile, signal can be amplified to analog value by signal conditioning circuit as required, and shields on-the-spot power frequency electromagnet interference. this on-line monitoring circuit is not when affecting power equipment insulating property, it is possible to automatically gather, process, store, judge the leakage electric current of insulator, real-time effectively monitoring low voltage grade power equipment leakage current conditions.
Accompanying drawing explanation
Fig. 1 is the utility model specific embodiment schematic circuit diagram.
Fig. 2 is the signal amplification circuit of the utility model specific embodiment signal conditioning circuit.
Fig. 3 is the signal filter circuit of the utility model specific embodiment signal conditioning circuit.
Fig. 4 is the utility model specific embodiment isolation schematic circuit.
In figure, 1-drainage ring, 2-drainage line, 3-current transformer with single-turn cored structure, 4-signal conditioning circuit, 5-isolates circuit, 6-central processing unit.
Embodiment
Below in conjunction with accompanying drawing, also by specific embodiment, the utility model is elaborated, and following examples are to explanation of the present utility model, and the utility model is not limited to following enforcement mode.
As shown in Figure 1, electric current on-line monitoring circuit is revealed in the power equipment insulation that the utility model provides, and comprises drainage ring 1, drainage line 2, current transformer with single-turn cored structure 3, signal conditioning circuit 4, isolation circuit 5, central processing unit 6.
Drainage ring 1 is connected with current transformer with single-turn cored structure 3 input terminus by drainage line 2, by the mode of drainage, power equipment surface is revealed electric current I 1 and introduces current transformer with single-turn cored structure 3, and drainage line 2 connects the earth after current transformer with single-turn cored structure 3.
Leakage electric current I 1, as iron core, is converted to the electric current I 2 of the other end by the material that current transformer with single-turn cored structure 3 selects permeability higher by electromagnetic coupled principle, and leakage electric current I 1 is carried out preliminary isolation and amplification.
Signal conditioning circuit 4 input terminus is connected with current transformer with single-turn cored structure 3 output terminal, by current/voltage conversion, amplification and filtering by the electric current I 2 of current transformer with single-turn cored structure 3 output terminal, turns into the level signal that central processing unit 6 can be sampled. As shown in Figures 2 and 3, signal conditioning circuit 4 comprises sampling resistance R1, amplifies circuit and filtering circuit.
As shown in Figure 2, adopting resistance R1 to be accurate employing resistance, it is connected with current transformer with single-turn cored structure 3 output terminal, converts the electric current of current transformer with single-turn cored structure 3 output terminal to voltage signal and exports to amplification circuit. Amplifying circuit is that two-stage amplifies circuit, and the first step amplifies the high-accuracy instrument AD620 amplifier of employing, and second stage amplification adopts OP27 operational amplifier. Adopt two-stage to amplify and as required signal can be amplified to analog value, and precision height, facilitate subsequent disposal.
As shown in Figure 3, filtering circuit input terminus is connected with amplification circuit output end, and it adopts fourth order low-pass wave filter, and limiting frequency is 100Hz, can effectively filtering scene power frequency electromagnet interference, it is to increase monitoring accuracy.
As shown in Figure 4; isolation circuit 5 is the isolation circuit 5 of Digital and analog; the input terminus of isolation circuit 5 is connected with signal conditioning circuit 4 output terminal; the output terminal of isolation circuit 5 is connected with central processing unit 6; to protect the central processing unit 6 of rear end, its adopt gain be 1 isolation operational amplifier ISO124, make the impact of central processing unit 6 damage voltage; eliminate measuring error, restraint speckle.
Central processing unit 6 is microprocessor or industrial computer, and the level signal being responsible for acquired signal conditioning circuit 4 output carries out processing in real time, analyzing and early warning.
Preferred implementation of the present utility model it is only disclosed in above; but the utility model is not limited thereto; what the technician of any this area can think does not have creative change; and do not departing under the utility model principle prerequisite the some improvements and modifications done, all should drop in protection domain of the present utility model.
Claims (9)
1. electric current on-line monitoring circuit is revealed in a power equipment insulation, it is characterised in that, comprising: drainage ring (1), drainage line (2), current transformer with single-turn cored structure (3), signal conditioning circuit (4), central processing unit (6);
Described drainage ring (1) is connected with current transformer with single-turn cored structure (3) input terminus by drainage line (2), described current transformer with single-turn cored structure (3) output terminal is connected with signal conditioning circuit (4) input terminus, and described signal conditioning circuit (4) output terminal is connected with central processing unit (6);
Described drainage ring (1) will be for revealing electric current introducing current transformer with single-turn cored structure (3);
Described current transformer with single-turn cored structure (3) is for isolating leakage electric current and amplify;
Described signal conditioning circuit (4) is for converting the electric current that current transformer with single-turn cored structure (3) exports to level signal;
Described central processing unit (6) carries out according to the level signal that signal conditioning circuit (4) exports processing in real time, analyzing and early warning.
2. electric current on-line monitoring circuit is revealed in power equipment according to claim 1 insulation, it is characterised in that, described signal conditioning circuit (4) comprising: sampling resistance, amplification circuit, filtering circuit; Described sampling resistance is connected with current transformer with single-turn cored structure (3) output terminal, and described sampling resistance converts the electric current that current transformer with single-turn cored structure (3) exports to voltage signal and exports to amplification circuit; Described amplification circuit output end is connected with filtering circuit input terminus; Described filtering circuit output terminal is connected with central processing unit (6).
3. electric current on-line monitoring circuit is revealed in power equipment according to claim 2 insulation, it is characterised in that, described amplification circuit is that two-stage amplifies circuit.
4. electric current on-line monitoring circuit is revealed in power equipment according to claim 3 insulation, it is characterised in that, the first step that two-stage amplifies circuit amplifies employing AD620 amplifier.
5. according to claim 3 or 4 power equipment insulation reveal electric current on-line monitoring circuit, it is characterised in that, two-stage amplify circuit the second stage amplify adopt OP27 operational amplifier.
6. according to Claims 2 or 3 or 4 power equipment insulation reveal electric current on-line monitoring circuit, it is characterised in that, filtering circuit adopt fourth order low-pass wave filter.
7. according to the arbitrary item of claim 1 ~ 4 power equipment insulation reveal electric current on-line monitoring circuit, it is characterised in that, also comprise: isolation circuit (5); The input terminus of described isolation circuit (5) is connected with signal conditioning circuit (4) output terminal, and the output terminal of isolation circuit (5) is connected with central processing unit (6); The isolation circuit that described isolation circuit (5) is Digital and analog.
8. power equipment according to claim 7 insulation reveal electric current on-line monitoring circuit, it is characterised in that, described isolation circuit (5) select gain be 1 isolation operational amplifier ISO124.
9. according to the arbitrary item of claim 1 ~ 4 power equipment insulation reveal electric current on-line monitoring circuit, it is characterised in that, central processing unit (6) is microprocessor or industrial computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520957223.7U CN205280857U (en) | 2015-11-26 | 2015-11-26 | Insulating leakage current on -line monitoring circuit of power equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520957223.7U CN205280857U (en) | 2015-11-26 | 2015-11-26 | Insulating leakage current on -line monitoring circuit of power equipment |
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| Publication Number | Publication Date |
|---|---|
| CN205280857U true CN205280857U (en) | 2016-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520957223.7U Expired - Fee Related CN205280857U (en) | 2015-11-26 | 2015-11-26 | Insulating leakage current on -line monitoring circuit of power equipment |
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| Country | Link |
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| CN (1) | CN205280857U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301432A (en) * | 2015-11-26 | 2016-02-03 | 国网山东省电力公司济南供电公司 | Electric power equipment insulation leakage current on-line monitoring circuit |
| CN110927650A (en) * | 2019-12-03 | 2020-03-27 | 国网江苏省电力有限公司常州供电分公司 | Harmonic voltage measuring device and method for capacitor voltage transformer |
| CN113812050A (en) * | 2019-03-28 | 2021-12-17 | 西门子能源全球有限公司 | Power transmission device and analysis method |
-
2015
- 2015-11-26 CN CN201520957223.7U patent/CN205280857U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301432A (en) * | 2015-11-26 | 2016-02-03 | 国网山东省电力公司济南供电公司 | Electric power equipment insulation leakage current on-line monitoring circuit |
| CN113812050A (en) * | 2019-03-28 | 2021-12-17 | 西门子能源全球有限公司 | Power transmission device and analysis method |
| CN110927650A (en) * | 2019-12-03 | 2020-03-27 | 国网江苏省电力有限公司常州供电分公司 | Harmonic voltage measuring device and method for capacitor voltage transformer |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160601 Termination date: 20181126 |