CN104111027B - Lissajous figure analytical method based transformer power frequency signal sensor system - Google Patents
Lissajous figure analytical method based transformer power frequency signal sensor system Download PDFInfo
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- CN104111027B CN104111027B CN201410365979.2A CN201410365979A CN104111027B CN 104111027 B CN104111027 B CN 104111027B CN 201410365979 A CN201410365979 A CN 201410365979A CN 104111027 B CN104111027 B CN 104111027B
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Abstract
The invention aims at solving measurement and switching of online voltage and current values confirming to requirements in a Lissajous figure analytical method and discloses a Lissajous figure analytical method based transformer power frequency signal sensor system. According to the technical scheme, the Lissajous figure analytical method based transformer power frequency signal sensor system comprises a mutual inductor and a signal processing circuit; the mutual inductor is used for collecting voltage or currents of a transformer; the signal processing circuit comprises two input ends and an output end. The Lissajous figure analytical method based transformer power frequency signal sensor system can effectively restrain common mode interference, switches differential signals into single-ended signals and meanwhile filters harmonic signals other than power frequency fundamental waves.
Description
Technical field
The present invention relates to electrical equipment online supervision technical field.
Background technology
In deformation of transformer winding field of fault detection it has been proposed that short-circuit reactance method, winding capacitance method and frequency are rung
The detection methods such as Ying Fa, Technical comparing is ripe, and has had code and the standard of correlation.But, offline inspection method requires to become
Depressor is stopped transport, and directly affects the normal operation of electrical network.Meanwhile, off-line monitoring is merely able to periodically carry out it is impossible to enough reflect in time
The deformation fault of winding.Particularly, the offline inspection cycle is long, easily ignores the cumulative function of winding deformation it is difficult to avoid accumulating
The winding gross distortion causing under effect；In addition, on-line operation is different with off-line operation state, offline inspection is difficult to find some
Just there is under on-line operation state the winding deformation fault of notable feature.Therefore, carry out deformation of transformer winding On-line Fault prison
The research of survey method is imperative.
The on-line monitorings such as the short circuit impedance method, mechanical vibration method, electromagnetic wave measurement method and the supersonic sounding method that propose at this stage
The method of winding deformation fault has certain defect, therefore proposes to be based on transformer on-Line Voltage and electric current Lee's Sa such as specificity analysis
The method of winding deformation fault.
Because existing power transformer itself is equiped with voltage sensor (PT) and current sensor (CT), can be direct
As measurement apparatus.But, the result of transformer set of PT, CT measurement output, it is not easy to the data acquisition of subsequent acquisition card
And process.
Content of the invention
Present invention aim to address in Lie groupoid analytic approach the measurement of satisfactory on-Line Voltage and current value and
Conversion.
Employed technical scheme comprise that such for realizing the object of the invention, the transformer work based on Lie groupoid analytic approach
Frequency signal transducer system it is characterised in that：Including transformer and signal processing circuit.
Described transformer is used for gathering voltage or the electric current of transformer.
Described signal processing circuit includes two inputs and an output end.
Two inputs of described signal processing circuit are connected with the output end of described transformer.
The first input end of described signal processing circuit is sequentially connected in series first resistor, 3rd resistor and the 4th resistance and is followed by
Ground.
After second input of described signal processing circuit is sequentially connected in series second resistance, the 5th resistance and the 6th resistance, even
It is connected on the output end of the first integrated transporting discharging.
One end of first electric capacity is connected between first resistor and 3rd resistor, the other end connects the second electric capacity.Described
Two electric capacity one end are connected between second resistance and the 5th resistance, the other end connects the first electric capacity.Described first electric capacity and second
Electric capacity indirectly.
The input in the same direction of described first integrated transporting discharging is connected between 3rd resistor and the 4th resistance.Described first is integrated
The reverse input end of amplifier is connected between the 5th resistance and the 6th resistance.
After the output end of described first integrated transporting discharging is sequentially connected in series the 7th resistance and the 8th resistance, it is connected to the second integrated fortune
The input in the same direction put.
After the reverse input end of described second integrated transporting discharging is sequentially connected in series the tenth resistance and the 4th electric capacity, it is connected to the 7th electricity
Between resistance and the 8th resistance.
The reverse input end of described second integrated transporting discharging is also connected with one end of the 9th resistance.Described 9th resistance another
After end series connection the 3rd electric capacity, it is connected to the output end of described first integrated transporting discharging.The output end of described second integrated transporting discharging connects
Between the 9th resistance and the 3rd electric capacity.
The output end of described second integrated transporting discharging is the output end of described signal processing circuit.
Further, described first integrated transporting discharging and the second integrated transporting discharging are OP07 chip.
Further, described transformer is Micro-Transformer of Voltage or micro-transformer of current.
The solution have the advantages that mathematical.Specifically, the present invention can measure complete for transformer PT and CT
Value is accurately converted to the signal being suitable to process, and this sensing system precision is sufficiently high, and rated operation frequency, voltage and current
All can PT and CT complete with transformer match.
Brief description
Fig. 1 is sensing system pie graph；
Fig. 2 is system circuit diagram.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples, but should not be construed the above-mentioned theme of the present invention
Scope is only limitted to following embodiments.Without departing from the idea case in the present invention described above, known according to ordinary skill
Know and customary means, make various replacements and change, all should include within the scope of the present invention.
Based on the transformer power frequency component sensing system of Lie groupoid analytic approach, including transformer and signal transacting electricity
Road.
Described transformer is used for gathering voltage or the electric current of transformer.Described transformer be arranged on existing power transformer
Device matches from voltage sensor (PT) with it and current sensor (CT).Specifically, when described transformer is miniature voltage
During transformer, (precision is 0.1 grade of draw pin formula voltage transformer to its model SKPT100100V/1.73V, rated operational voltage
For 100 V, rated operation frequency is 50-400 Hz, no-load voltage ratio 100V：1.73V.), including two input ports and two output ends
Mouthful.Signal, output port and signal processing circuit that the input port input voltage sensor (PT) of voltage transformer collects
Connect.When described transformer is micro-transformer of current, (precision is 0.1 grade to its model HLX15A/2.5mA 0.0520 Ω
Draw pin formula current sensor, no-load voltage ratio 5 A:2.5 mA, secondary nominal load 24 Ω), including an input port, two outputs
Port and two fixed ports.Signal that input port input current sensor (CT) of current transformer collects, output end
Mouth is connected with signal processing circuit.
Described signal processing circuit includes two inputs and an output end.
Two inputs of described signal processing circuit are connected with the output end of described transformer.
The first input end of described signal processing circuit is sequentially connected in series first resistor R1,3rd resistor R3 and the 4th resistance R4
After be grounded.
Second input of described signal processing circuit is sequentially connected in series second resistance R2, the 5th resistance R5 and the 6th resistance R6
Afterwards, it is connected to the output end of the first integrated transporting discharging.
One end of first electric capacity C1 is connected between first resistor R1 and 3rd resistor R3, the other end connects the second electric capacity
C2.Described second electric capacity C2 one end is connected between second resistance R2 and the 5th resistance R5, the other end connects the first electric capacity C1.Institute
State the first electric capacity C1 and the second electric capacity C2 indirectly.
The input in the same direction of described first integrated transporting discharging is connected between 3rd resistor R3 and the 4th resistance R4.Described first
The reverse input end of integrated transporting discharging is connected between the 5th resistance R5 and the 6th resistance R6.
After the output end of described first integrated transporting discharging is sequentially connected in series the 7th resistance R7 and the 8th resistance R8, it is connected to the second collection
Become the input in the same direction of amplifier.
After the reverse input end of described second integrated transporting discharging is sequentially connected in series the tenth resistance R10 and the 4th electric capacity C4, it is connected to
Between 7th resistance R7 and the 8th resistance R8.
The reverse input end of described second integrated transporting discharging is also connected with one end of the 9th resistance R9.Described 9th resistance R9's
The other end is connected after the 3rd electric capacity C3, is connected to the output end of described first integrated transporting discharging.The output of described second integrated transporting discharging
End is connected between the 9th resistance R9 and the 3rd electric capacity C3.
The output end of described second integrated transporting discharging is the output end of described signal processing circuit.
In embodiment, described first integrated transporting discharging and the second integrated transporting discharging are OP07 chip.OP07 chip is a kind of low
Noise, bipolarity (dual power supply) operational amplifier integrated circuit of non-chopper-zero-stabilized.
The present invention can effectively suppression common mode disturb, and differential signal is converted to single-ended signal, filter power frequency base simultaneously
Harmonic signal beyond ripple, and signal amplitude is adjusted to 2.5 V, its component parameters meets R1=R2=R3=R4、R5C1=R6C2
=0.0016.When described transformer is Micro-Transformer of Voltage, if multiplication factor is 1.02, need to meet condition R8/R7=
0.02.When described transformer is micro-transformer of current, if multiplication factor is 29.46, need to meet condition R8/R7=
28.46.
Claims (2)
1. the transformer power frequency component sensing system based on Lie groupoid analytic approach it is characterised in that：Including transformer and letter
Number process circuit；
Described transformer is used for gathering voltage or the electric current of transformer；
Described signal processing circuit includes two inputs and an output end；
Two inputs of described signal processing circuit are connected with the output end of described transformer；
The first input end of described signal processing circuit is sequentially connected in series first resistor R1,3rd resistor R3 and the 4th resistance R4 and is followed by
Ground；
Second input of described signal processing circuit is sequentially connected in series second resistance R2, after the 5th resistance R5 and the 6th resistance R6,
It is connected to the output end of the first integrated transporting discharging；
One end of first electric capacity C1 is connected between first resistor R1 and 3rd resistor R3, the other end connects the second electric capacity C2；Institute
State second electric capacity C2 one end be connected between second resistance R2 and the 5th resistance R5, the other end connect the first electric capacity C1；Described
One electric capacity C1 and the second electric capacity C2 indirectly；The input in the same direction of described first integrated transporting discharging is connected to 3rd resistor R3 and
Between four resistance R4；The reverse input end of described first integrated transporting discharging is connected between the 5th resistance R5 and the 6th resistance R6；
After the output end of described first integrated transporting discharging is sequentially connected in series the 7th resistance R7 and the 8th resistance R8, it is connected to the second integrated fortune
The input in the same direction put；
After the reverse input end of described second integrated transporting discharging is sequentially connected in series the tenth resistance R10 and the 4th electric capacity C4, it is connected to the 7th
Between resistance R7 and the 8th resistance R8；
The reverse input end of described second integrated transporting discharging is also connected with one end of the 9th resistance R9；Described 9th resistance R9's is another
After end series connection the 3rd electric capacity C3, it is connected to the output end of described first integrated transporting discharging；The output end of the second integrated transporting discharging is connected to
Between 9th resistance R9 and the 3rd electric capacity C3；
The output end of described second integrated transporting discharging is the output end of described signal processing circuit；
Component parameters meet R1=R2=R3=R4, R5C1=R6C2=0.0016；When described transformer is miniature mutual induction of voltage
During device, if multiplication factor is 1.02, need to meet condition R8/R7=0.02；When described transformer is micro-transformer of current,
If multiplication factor is 29.46, need to meet condition R8/R7=28.46；
Described first integrated transporting discharging and the second integrated transporting discharging are OP07 chip.
2. the transformer power frequency component sensing system based on Lie groupoid analytic approach according to claim 1, its feature
It is：Described transformer is Micro-Transformer of Voltage or micro-transformer of current.
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| CN104930963A (en) * | 2015-06-11 | 2015-09-23 | 国家电网公司 | Impedance circle characteristic-based transformer winding deformation discrimination method |
| CN107656174B (en) * | 2017-08-07 | 2021-03-02 | 中国电力科学研究院 | Method and system for online diagnosis of transformer winding deformation |
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| CN103217579A (en) * | 2012-12-28 | 2013-07-24 | 富阳市供电局 | On-line monitoring system of transformer winding |
| CN203534516U (en) * | 2013-07-31 | 2014-04-09 | 广东电网公司汕头供电局 | On-line monitoring device for deformation of winding and transformer |
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