CN103777126B - A kind of partial discharge of transformer sonac circuit structure - Google Patents
A kind of partial discharge of transformer sonac circuit structure Download PDFInfo
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- CN103777126B CN103777126B CN201310591086.5A CN201310591086A CN103777126B CN 103777126 B CN103777126 B CN 103777126B CN 201310591086 A CN201310591086 A CN 201310591086A CN 103777126 B CN103777126 B CN 103777126B
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- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 238000001514 detection method Methods 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
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Abstract
The present invention relates to a kind of partial discharge of transformer sonac circuit structure, belong to for electro-detection equipment technical field.Technical scheme is: ultrasonic sensor (1), wave filter (2), first order amplifier (3), second level amplifier (4), third level amplifier (5), integrator (6), follower (7) are sequentially connected with, the input of negative-feedback circuit (8) interconnects with follower, output interconnects with second level amplifier (4), and the output of voltage offset electric circuit (9) interconnects with second level amplifier (4), third level amplifier (5), integrator (6), negative-feedback circuit (8) respectively.The invention has the beneficial effects as follows: circuit theory is simple, components and parts consumption is few, and multiplication factor can regulate, and output signal-to-noise ratio is high, waveform output is good, highly sensitive, can quickly catch ultrasonic signal produced by partial discharge of transformer, be particularly suitable for partial discharge of transformer detection.
Description
Technical field
The present invention relates to a kind of partial discharge of transformer sonac circuit structure, belong to for electro-detection equipment technical field.
Background technology
Recently as the fast development of power system, capacity and the electric pressure of transformer improve constantly, and operating safety problem the most increasingly comes into one's own.In the fault that transformer is occurred, Insulation Problems accounts for the biggest proportion, it is therefore desirable to the insulation status of transformer is monitored by a kind of effective means, it is ensured that the safety of transformer in operation.Partial Discharge Detection, as the effective means of the one that detection is transformer insulated, either etection theory or detection technique, the most all achieves bigger development, and has obtained the application of reality in power plant and power station.Partial discharge of transformer ultrasound checking is strong with its antijamming capability and is easy to the advantage of the aspects such as location and has the most become the much-talked-about topic of research both at home and abroad.When shelf depreciation occurs, the pulse current that invariably accompanies, electromagnetic radiation and sound, light, heat produce some lower-molecular substances etc., and shelf depreciation ultrasonic method is aiming at the ultrasonic signal of this process generation and grows up.Ultrasonic wave that partial discharge of transformer is produced by sonac receives, and is translated into the signal of telecommunication and carries out processing, exporting.Traditional transformer shelf depreciation ultrasonic circuit signal to noise ratio is low, and during signal output, more and sensor the sensitivity of wave distortion is relatively low, is therefore accurately positioned the location comparison difficulty of partial discharge of transformer.
Summary of the invention
It is an object of the present invention to provide a kind of partial discharge of transformer sonac circuit structure, by using third stage amplifier, output signal-to-noise ratio is high, waveform output is good, highly sensitive, solves the problems referred to above present in background technology.
The technical scheme is that a kind of partial discharge of transformer sonac circuit structure, comprise ultrasonic sensor, wave filter, first order amplifier, second level amplifier, third level amplifier, integrator, follower, negative-feedback circuit and voltage offset electric circuit, described ultrasonic sensor, wave filter, first order amplifier, second level amplifier, third level amplifier, integrator, follower is sequentially connected with, the input of negative-feedback circuit interconnects with follower, output interconnects with second level amplifier, the output of voltage offset electric circuit respectively with second level amplifier, third level amplifier, integrator, negative-feedback circuit interconnects.
Described ultrasonic sensor is the piezoceramic transducer of 40-300KHz.
Described wave filter is the bandpass filter of 40-300KHz.
Described first order amplifier comprises triode one, electric capacity one and resistance one, and described triode one base stage interconnects with electric capacity one, and colelctor electrode interconnects with resistance 12 and is followed by power supply, and exports through electric capacity four.
Described second level amplifier comprises operational amplifier one, voltage offset electric circuit comprises operational amplifier two, and third level amplifier comprises operational amplifier three, and integrator comprises operational amplifier four, follower comprises operational amplifier five, and negative-feedback circuit comprises operational amplifier six；nullOperational amplifier one in-phase input end is connected to the tail end of first order amplifier，Inverting input is connected to the output of operational amplifier one，And ground connection，Constitute second level amplifier，The in-phase input end of operational amplifier two is connected to power supply，And ground connection，Inverting input is connected to the output of operational amplifier two，Constitute voltage offset electric circuit，And it is connected to the input of operational amplifier one homophase input pickup resistance，Operational amplifier three in-phase input end is connected to the output of operational amplifier two，Inverting input is connected to the output of operational amplifier one，Constitute third level amplifier，The in-phase input end of operational amplifier four is connected to the output of operational amplifier two，Inverting input is connected to the output of operational amplifier three and constitutes integrator，Operational amplifier five in-phase input end is connected to the output of operational amplifier four，Inverting input is connected to the output of operational amplifier five，Constitute follower，The in-phase input end of operational amplifier six is connected to the output of operational amplifier two，Inverting input is connected to the output of operational amplifier five，And it is connected to the inverting input of operational amplifier three，Constitute negative-feedback circuit.
Also comprising operational amplifier seven, described operational amplifier seven in-phase input end is connected to the output of operational amplifier five, and inverting input is connected to the output of operational amplifier seven.
The invention has the beneficial effects as follows: circuit theory is simple, components and parts consumption is few, and multiplication factor can regulate, and output signal-to-noise ratio is high, waveform output is good, highly sensitive, can quickly catch ultrasonic signal produced by partial discharge of transformer, be particularly suitable for partial discharge of transformer detection.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the present invention；
Fig. 2 is the circuit theory diagrams of the present invention；
In figure: ultrasonic sensor 1；Wave filter 2；First order amplifier 3；Second level amplifier 4；Third level amplifier 5；Integrator 6；Follower 7；Negative-feedback circuit 8；Voltage offset electric circuit 9；Operational amplifier one U1A；Operational amplifier two U1B；Operational amplifier three U2A；Operational amplifier four U2B；Operational amplifier five U2C；Operational amplifier six U2D；Operational amplifier seven U3B.
J-sonac；C-electric capacity；Q-triode；R-resistance；D-diode.
Detailed description of the invention
Below in conjunction with accompanying drawing, by embodiment, the invention will be further described.
A kind of partial discharge of transformer sonac circuit structure, comprise ultrasonic sensor 1, wave filter 2, first order amplifier 3, second level amplifier 4, third level amplifier 5, integrator 6, follower 7, negative-feedback circuit 8 and voltage offset electric circuit 9, described ultrasonic sensor 1, wave filter 2, first order amplifier 3, second level amplifier 4, third level amplifier 5, integrator 6, follower 7 is sequentially connected with, the input of negative-feedback circuit 8 interconnects with follower 7, output interconnects with second level amplifier 4, the output of voltage offset electric circuit 9 respectively with second level amplifier 4, third level amplifier 5, integrator 6, negative-feedback circuit 8 interconnects.
Described ultrasonic sensor 1 is the piezoceramic transducer of 40-300KHz.
Described wave filter 2 is the bandpass filter of 40-300KHz.
Described first order amplifier 3 comprises triode one, electric capacity one and resistance one, and described triode one base stage interconnects with electric capacity one, and colelctor electrode interconnects with resistance 12 and is followed by power supply, and exports through electric capacity four.
Described second level amplifier 4 comprises operational amplifier one U1A, voltage offset electric circuit 9 comprises operational amplifier two U1B, third level amplifier 5 comprises operational amplifier three U2A, integrator 6 comprises operational amplifier four U2B, follower 7 comprises operational amplifier five U2C, and negative-feedback circuit 8 comprises operational amplifier six U2D；nullOperational amplifier one U1A in-phase input end is connected to the tail end of first order amplifier 3，Inverting input is connected to the output of operational amplifier one U1A，And ground connection，Constitute second level amplifier 4，The in-phase input end of operational amplifier two U1B is connected to power supply，And ground connection，Inverting input is connected to the output of operational amplifier two U1B，Constitute voltage offset electric circuit 9，And it is connected to the input of operational amplifier one U1A in-phase input end resistance，Operational amplifier three U2A in-phase input end is connected to the output of operational amplifier two U1B，Inverting input is connected to the output of operational amplifier one U1A，Constitute third level amplifier 5，The in-phase input end of operational amplifier four U2B is connected to the output of operational amplifier two U1B，Inverting input is connected to the output of operational amplifier three U2A and constitutes integrator 6，Operational amplifier five U2C in-phase input end is connected to the output of operational amplifier four U2B，Inverting input is connected to the output of operational amplifier five U2C，Constitute follower 7，The in-phase input end of operational amplifier six U2D is connected to the output of operational amplifier two U1B，Inverting input is connected to the output of operational amplifier five U2C，And it is connected to the inverting input of operational amplifier three U2A，Constitute negative-feedback circuit 8.
Also comprising operational amplifier seven U3B, described operational amplifier seven U3B in-phase input end is connected to the output of operational amplifier five U2C, and inverting input is connected to the output of operational amplifier seven U3B.
Partial discharge of transformer sonac circuit, its ultrasonic sensor uses 40-300KHz piezoceramic transducer, owing to piezoelectric ceramics differs too big (about 4-5 the order of magnitude) with the acoustic impedance of air, need to increase impedance matching layer for improving receiving efficiency；Its wave filter is the bandpass filter of 40-300KHz, reduces the interference to useful signal of the outside noise signal, improves signal to noise ratio；Its amplifying circuit uses the amplifying circuit of low-noise low-power consumption, and adjustable gain.
In the case of not having signal to input, the pressure drop between base stage and the emitter stage of triode Q1 is 0, and triode is not turned on, and does not has effective AC signal in circuit, and output no signal exports.
After J1 receives ultrasonic signal, between base stage and the emitter stage of first order amplifier triode Q1, voltage is more than 0.7V, and triode turns on, and is amplified signal, by regulating the resistance size of R3, thus it is possible to vary its multiplication factor.Through C4 every directly, voltage offset electric circuit operational amplifier two U1B providing the voltage of 1/2VCC1, second level amplifier opamp one U1A is amplified；It is amplified through third level amplifier opamp three U2A again；Integrator operational amplifier four U2B act as making signal lag anti-phase input 90 degree；Through follower operational amplifier five U2C；By negative-feedback circuit operational amplifier six U2D, signal is returned to the inverting input of second level amplifier, and phase lag signal 180 degree；Eventually pass follower operational amplifier seven U3B output, act as reducing output resistance；It is the power supply circuits of circuit at U4.
The model of each integrated circuit be triode Q1 be BC550C；U1, U3 are TL062；U2 is TL064；U4 is L78L09ACZ.
Claims (5)
- null1. a partial discharge of transformer sonac circuit structure，It is characterized in that: comprise ultrasonic sensor (1)、Wave filter (2)、First order amplifier (3)、Second level amplifier (4)、Third level amplifier (5)、Integrator (6)、Follower (7)、Negative-feedback circuit (8) and voltage offset electric circuit (9)，Described ultrasonic sensor (1)、Wave filter (2)、First order amplifier (3)、Second level amplifier (4)、Third level amplifier (5)、Integrator (6)、Follower (7) is sequentially connected with，The input of negative-feedback circuit (8) interconnects with follower (7)，Output interconnects with second level amplifier (4)，The output of voltage offset electric circuit (9) respectively with second level amplifier (4)、Third level amplifier (5)、Integrator (6)、Negative-feedback circuit (8) interconnects；Described second level amplifier (4) comprises operational amplifier one (U1A), voltage offset electric circuit (9) comprises operational amplifier two (U1B), third level amplifier (5) comprises operational amplifier three (U2A), integrator (6) comprises operational amplifier four (U2B), follower (7) comprises operational amplifier five (U2C), and negative-feedback circuit (8) comprises operational amplifier six (U2D)；nullOperational amplifier one (U1A) in-phase input end is connected to the tail end of first order amplifier (3)，Inverting input is connected to the output of operational amplifier one (U1A)，And ground connection，Constitute second level amplifier (4)，The in-phase input end of operational amplifier two (U1B) is connected to power supply，And ground connection，Inverting input is connected to the output of operational amplifier two (U1B)，Constitute voltage offset electric circuit (9)，And it is connected to the input of operational amplifier one (U1A) in-phase input end resistance，Operational amplifier three (U2A) in-phase input end is connected to the output of operational amplifier two (U1B)，Inverting input is connected to the output of operational amplifier one (U1A)，Constitute third level amplifier (5)，The in-phase input end of operational amplifier four (U2B) is connected to the output of operational amplifier two (U1B)，Inverting input is connected to the output of operational amplifier three (U2A) and constitutes integrator (6)，Operational amplifier five (U2C) in-phase input end is connected to the output of operational amplifier four (U2B)，Inverting input is connected to the output of operational amplifier five (U2C)，Constitute follower (7)，The in-phase input end of operational amplifier six (U2D) is connected to the output of operational amplifier two (U1B)，Inverting input is connected to the output of operational amplifier five (U2C)，And it is connected to the inverting input of operational amplifier three (U2A)，Constitute negative-feedback circuit (8).
- A kind of partial discharge of transformer sonac circuit structure the most according to claim 1, it is characterised in that: described ultrasonic sensor (1) is the piezoceramic transducer of 40-300KHz.
- A kind of partial discharge of transformer sonac circuit structure the most according to claim 1, it is characterised in that: described wave filter (2) is the bandpass filter of 40-300KHz.
- A kind of partial discharge of transformer sonac circuit structure the most according to claim 1, it is characterized in that: described first order amplifier (3) comprises triode one, electric capacity one and resistance one, described triode one base stage interconnects with electric capacity one, colelctor electrode interconnects with resistance 12 and is followed by power supply, and exports through electric capacity four.
- A kind of partial discharge of transformer sonac circuit structure the most according to claim 3, it is characterized in that: also comprise operational amplifier seven (U3B), described operational amplifier seven (U3B) in-phase input end is connected to the output of operational amplifier five (U2C), and inverting input is connected to the output of operational amplifier seven (U3B).
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| CN201310591086.5A CN103777126B (en) | 2013-11-22 | 2013-11-22 | A kind of partial discharge of transformer sonac circuit structure |
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| CN201310591086.5A CN103777126B (en) | 2013-11-22 | 2013-11-22 | A kind of partial discharge of transformer sonac circuit structure |
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| CN103777126A CN103777126A (en) | 2014-05-07 |
| CN103777126B true CN103777126B (en) | 2016-09-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106197430B (en) * | 2016-07-29 | 2019-03-22 | 成都蛋壳众创科技有限公司 | A kind of high-performance navigation processing system based on cloud computing |
| CN110763959B (en) * | 2019-09-24 | 2022-02-22 | 武汉汉源既济电力有限公司 | High-voltage switch cabinet partial discharge detection method |
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Inventor after: Yue Guoliang Inventor after: Gao Yanhai Inventor after: Liu Hongliang Inventor after: Kang Yong Inventor after: Cao Kang Inventor before: Gao Yanhai Inventor before: Yue Guoliang Inventor before: Liu Hongliang Inventor before: Kang Yong Inventor before: Cao Kang |
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