CN202382849U - Vibration signal processing circuit of transformer - Google Patents
Vibration signal processing circuit of transformer Download PDFInfo
- Publication number
- CN202382849U CN202382849U CN2011205463336U CN201120546333U CN202382849U CN 202382849 U CN202382849 U CN 202382849U CN 2011205463336 U CN2011205463336 U CN 2011205463336U CN 201120546333 U CN201120546333 U CN 201120546333U CN 202382849 U CN202382849 U CN 202382849U
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- circuit
- signal processing
- vibration signal
- pass filter
- transformer
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Abstract
The utility model relates to a vibration signal processing circuit of a transformer and belongs to the technical field of transformer detection instruments. The technical scheme provided by the vibration signal processing circuit is that the vibration signal processing circuit comprises an impedance conversion circuit (1), a low-pass filter circuit (2), a signal amplifying circuit (3), a high-pass filter circuit (4) and an output amplifying circuit (5), wherein the impedance conversion circuit is connected with the signal amplifying circuit through the low-pass filter circuit, and the signal amplifying circuit is connected with the output amplifying circuit through the high-pass filter circuit. The vibration signal processing circuit has the advantages that the circuit design is simple, the assembly and the debugging are convenient, the open loop gain of an operation amplifier is very high, the input impedance of the operation amplifier is high, and the detuning and the temperature drift are small. Therefore, the vibration signal processing circuit is suitable for processing the amplification of various weak signals, the interference is eliminated, the sensitivity is high, and the real-time on-line monitoring can be realized.
Description
Technical field
The utility model relates to a kind of transformer vibration signal processing circuit, belongs to transformer detecting instrument technical field.
Background technology
Acceleration transducer is a kind of small-sized inertial sensor, is the main survey instrument of many control system and detection system.Last century the seventies, along with The application of new technique and development such as microelectric technique, semiconductor technology sensor technology, computer technology and micro-processing technologies, the acceleration transducer technology has obtained fast development.Power transformer is one of major equipment in the electric system, utilizes it to be bound up the electrical network of different voltages, forms complicated electrical network or huge electric system, and plays an important role therein.The reliability service of power transformer is related to the safety of whole electrical network.How the operation conditions of power transformer is monitored, prevent its incipient fault, become the power department urgent problem.
From the present domestic emphasis that transformer is carried out vibration-testing and research, roughly can be divided into three aspects, the one, the vibrative mechanism of transformer is studied, comprise failure cause, fault progression and trend prediction etc.; The 2nd, the analysis to transformer produces vibration signal comprises analysis of spectrum, noise separation technology etc.; The 3rd, to the development of Vibration Monitoring, comprise measuring point layout, Signal Spacing and fault analysis etc.Through being attached to the situation of change of transformer vibration transducer on one's body transformer body vibration acceleration signal when monitoring zero load, thereby diagnose the measuring phase of inner winding.Its advantage is not to be electrically connected with whole conducting system, can be safely, on-line monitoring reliably.Vibration monitoring is a kind of external monitoring; One or more vibration transducers through being installed in the equipment surface of moving obtain its vibration signal; Then vibration signal is handled through time domain or frequency domain etc. analyses; The characteristic information of picked up signal obtains the working condition of equipment again through certain diagnostic method.The problem that background technology exists is: measuring frequency band is narrow, and a little less than the antijamming capability, poor sensitivity can not formerly be monitored in real time.
The utility model content
The purpose of the utility model provides a kind of transformer vibration signal processing circuit, can amplify the low frequency electric signal, eliminate to disturb, highly sensitive, can real time on-line monitoring, solve the problems referred to above that background technology exists.
The technical scheme of the utility model is: a kind of transformer vibration signal processing circuit; Comprise impedance inverter circuit, low-pass filter circuit, signal amplification circuit, high-pass filtering circuit and output amplifier; Impedance inverter circuit connects signal amplification circuit through low-pass filter circuit, and signal amplification circuit connects output amplifier through high-pass filtering circuit.
Impedance inverter circuit is made up of fixed resistance, FET and mica capacitor; Low-pass filter circuit, high-pass filtering circuit are made up of ROHS and fixed resistance; Signal amplification circuit is made up of fixed resistance, mica capacitor and operational amplifier.
The utility model utilizes piezoelectric ceramics to convert vibration signal into electric signal, and the electric signal of piezoelectric ceramics output outputs to the signal analysis instrument after amplifying through impedance conversion, high LPF, signal.
The beneficial effect of the utility model is: the utility model circuit design is simple, and assembly and adjustment is convenient, and the open-loop gain of operational amplifier is all very high, and the input impedance of operational amplifier is high, and imbalance and temperature are floated all very little.So be fit to handle very much the amplification of various feeble signals, eliminate disturb, highly sensitive, can real time on-line monitoring.
Description of drawings
Fig. 1 is the structural representation of the utility model;
Fig. 2 is the circuit theory synoptic diagram of the utility model;
Among the figure: impedance inverter circuit 1, low-pass filter circuit 2, signal amplification circuit 3, high-pass filtering circuit 4, output amplifier 5.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further through embodiment.
A kind of transformer vibration signal processing circuit; Comprise impedance inverter circuit 1, low-pass filter circuit 2, signal amplification circuit 3, high-pass filtering circuit 4 and output amplifier 5; Impedance inverter circuit connects signal amplification circuit through low-pass filter circuit, and signal amplification circuit connects output amplifier through high-pass filtering circuit.
Impedance inverter circuit is made up of fixed resistance, FET and mica capacitor; Low-pass filter circuit, high-pass filtering circuit are made up of ROHS and fixed resistance; Signal amplification circuit is made up of fixed resistance, mica capacitor and operational amplifier.
The utility model principle of work: with reference to accompanying drawing 2, the deformation meeting takes place and produces faint electric signal in piezoelectric patches Y1, and faint electric signal cuts little ice in circuit control.Must amplify ultra-weak electronic signal, just can make follow-up circuit operate as normal.The impedance inverter circuit that the electric signal process FET Q1 of Y1 output and fixed value resistance R1, R2, R3, R4 form diminishes signal output impedance, the high low-pass filter circuit of forming through ROHS C2, C3 and precision resistance R5 then; Eliminate low-frequency disturbance, pass through operational amplifier U1 again, carry out primary signal and amplify; Fixed value resistance R6 is a negative feedback resistor, carries out filtering through the low-pass filter of being made up of precision resistance R7, R8 and ROHS C7, C8 again through elementary amplifying signal, eliminates high frequency interference; Signal amplifies back output through operational amplifier U2 at last, and value resistance R 9 is a negative feedback resistor, and the utility model circuit design is simple; Assembly and adjustment is convenient; The open-loop gain of operational amplifier is all very high, and the input impedance of operational amplifier is high, and imbalance and temperature are floated all very little.So very be fit to handle the amplification of various feeble signals.
Claims (2)
1. transformer vibration signal processing circuit; It is characterized in that: comprise impedance inverter circuit (1), low-pass filter circuit (2), signal amplification circuit (3), high-pass filtering circuit (4) and output amplifier (5); Impedance inverter circuit connects signal amplification circuit through low-pass filter circuit, and signal amplification circuit connects output amplifier through high-pass filtering circuit.
2. a kind of transformer vibration signal processing circuit according to claim 1, it is characterized in that: impedance inverter circuit is made up of fixed resistance, FET and mica capacitor; Low-pass filter circuit, high-pass filtering circuit are made up of ROHS and fixed resistance; Signal amplification circuit is made up of fixed resistance, mica capacitor and operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205463336U CN202382849U (en) | 2011-12-23 | 2011-12-23 | Vibration signal processing circuit of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205463336U CN202382849U (en) | 2011-12-23 | 2011-12-23 | Vibration signal processing circuit of transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202382849U true CN202382849U (en) | 2012-08-15 |
Family
ID=46631344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205463336U Expired - Fee Related CN202382849U (en) | 2011-12-23 | 2011-12-23 | Vibration signal processing circuit of transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202382849U (en) |
-
2011
- 2011-12-23 CN CN2011205463336U patent/CN202382849U/en not_active Expired - Fee Related
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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: 20120815 Termination date: 20131223 |