CN209296797U - High-tension cable circulating current Acquisition Circuit - Google Patents
High-tension cable circulating current Acquisition Circuit Download PDFInfo
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- CN209296797U CN209296797U CN201821887480.8U CN201821887480U CN209296797U CN 209296797 U CN209296797 U CN 209296797U CN 201821887480 U CN201821887480 U CN 201821887480U CN 209296797 U CN209296797 U CN 209296797U
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Abstract
The utility model discloses a kind of high-tension cable circulating current Acquisition Circuits, it includes the first current transformer (CT1), second current transformer (CT2), first resistor (R1), second resistance (R2), 3rd resistor (R3), 4th resistance (R4), first capacitor (C1), second capacitor (C2), third capacitor (C3), operational amplifier (U1), wherein the first current transformer (CT1), second current transformer (CT2) cascades scaled down input current, input current is converted voltage by the output end that first resistor (R1) connects the second Current Transmit 2；First capacitor (C1), the second capacitor (C2) absorb input pulse；Third capacitor (C3) and the 4th resistance (R4) constitute low-pass filter.The cable sheath current collection circuit structure of the utility model is simple, and signal-to-noise ratio is high, low in energy consumption.
Description
Technical field
The utility model relates to on-line monitoring of high-voltage electric equipment technical field, simple more particularly, to a kind of structure,
The high-tension cable circulating current Acquisition Circuit of low-power consumption.
Background technique
With sustained economic growth, urban distribution network is grown rapidly, in order to meet modern city to power supply reliability, the beautification of the environment
The requirement of change, cable are widely applied in urban distribution network.
The underground laying of power cable is generally all in pipeline and channel, and work is in adverse circumstances such as humidity, high temperature throughout the year
Under, long-term charging operation necessarily will appear insulation safety problem.
For high-tension cable (110kV or more), metal sheath generally uses cross interconnected two sides earth or single-ended straight
The connection type of ground connection, sheath under normal circumstances only have it is a few peace to more than ten peace induced currents, if cable cover(ing) because chemistry,
The factors such as machinery are damaged and multipoint earthing, and shield circulating current can rise to very big numerical value, and principal current may be reached when serious
50%-90%, that is, dozens of Ann peaces even up to a hundred are lost very big, or even electric cable explosion can occur, influence electric system
Safe operation.At this moment with regard to needing to carry out real-time control by observation circulating current value come the insulation status to cable.
Currently, the on-line monitoring system of some high-voltage cable insulating states its signal acquisition circuit structure in the market compares
Low-power consumption requirement that is cumbersome, being unable to reach certain technical grades.
Utility model content
The technical problem to be solved by the present invention is to be directed to the on-line monitoring system of existing high-voltage cable insulating state
Signal acquisition circuit structure is cumbersome for its, be unable to reach certain technical grades low-power consumption requirement defect, provide a kind of structure it is simple,
Cable sheath current collection circuit low in energy consumption.
The technical scheme adopted by the utility model to solve the technical problem is as follows:
A kind of high-tension cable circulating current Acquisition Circuit is provided, the circuit is mutual including the first current transformer, the second electric current
Sensor, first resistor, second resistance, 3rd resistor, the 4th resistance, first capacitor, the second capacitor, third capacitor, operation amplifier
Device；
The output end of first current transformer connects the input terminal of the second current transformer；
First resistor is connected to the output end of the second current transformer；
One end of first capacitor connects the A output end of the second current transformer, and other end ground connection constitutes the first low-pass filtering
Circuit；
The B output end of one the second current transformer of termination of the second capacitor, other end ground connection constitute the second low-pass filtering electricity
Road；
One end of second resistance connects the A output end of the second current transformer, and the other end connects the just defeated of operational amplifier
Enter end；
One end of 3rd resistor connects the B output end of the second current transformer, and bearing for other end connection operational amplifier is defeated
Enter end；
Third capacitor and the 4th resistor coupled in parallel are connected to the negative input end and output end of operational amplifier, constitute third low pass filtered
Wave circuit.
Above-mentioned technical proposal is connect, the B output end of the second current transformer introduces DC offset voltage.
Above-mentioned technical proposal is connect, the parallel impedance of second resistance and 3rd resistor, the 4th resistance matches.
Above-mentioned technical proposal is connect, the first current transformer is straight-through current transformer, and the second current transformer is miniature
Precision current transformer, the two cascade scaled down input current.
Above-mentioned technical proposal is connect, first resistor is precision resistance.
Above-mentioned technical proposal is connect, third capacitor is filter capacitor.
The beneficial effect that the utility model generates is: the high-tension cable circulating current Acquisition Circuit of the utility model utilizes two
Grade current transformer reduces input current, converts voltage for input current by first resistor.First capacitor and the second capacitor
Absorb input pulse.Amplification factor is set by 3rd resistor and the 4th resistance, second resistance and 3rd resistor, the 4th resistance
Parallel impedance matches.It can be seen that the high-tension cable circulating current Acquisition Circuit only includes the necessary first device for guaranteeing signal acquisition
Part, circuit structure is simple, low in energy consumption.
Further, pole is introduced by third capacitor, prevents amplifier self-excitation, while constituting low-pass filter, improve signal
Signal-to-noise ratio.
Detailed description of the invention
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing:
Fig. 1 is the high-tension cable circulating current Acquisition Circuit schematic diagram of the utility model embodiment.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only to explain this
Utility model is not used to limit the utility model.
As shown in Figure 1, high-tension cable circulating current Acquisition Circuit includes the first Current Transmit 1, the second Current Mutual Inductance
Device CT2, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, first capacitor C1, the second capacitor C2, third
Capacitor C3, operational amplifier U1.
Wherein:
The output end of first Current Transmit 1 connects the input terminal of the second Current Transmit 2；
First resistor R1 is connected to the output end of the second Current Transmit 2, converts voltage for input current；
One end of first capacitor C1 connects the A output end of the second Current Transmit 2, and it is low to constitute first for other end ground connection
Bandpass filter circuit；
The B output end of second Current Transmit 2 of termination of second capacitor C2, other end ground connection constitute the second low pass
Filter circuit；First capacitor C1, the second capacitor C2 absorb prime and input bring pulse；
One end of second resistance R2 connects the A output end of the second Current Transmit 2, and the other end connects operational amplifier U1
Positive input terminal；
One end of 3rd resistor R3 connects the B output end of the second Current Transmit 2, and the other end connects operational amplifier U1
Negative input end；
Third capacitor C3 and the 4th resistance R4 is connected in the negative input end and output end of operational amplifier U1, constitutes third
Low-pass filter circuit.
First Current Transmit 1 can be straight-through current transformer, and the second Current Transmit 2 can be Miniature precision electricity
Current transformer, the input terminal of output the second Current Transmit 2 of termination of the first Current Transmit 1, the two cascade equal proportion
Reduce input current.
Second resistance R2 and the parallel impedance of 3rd resistor R3, the 4th resistance R4 match；
The high-tension cable circulating current Acquisition Circuit of the utility model only includes the necessary component for guaranteeing signal acquisition,
Circuit structure is simple, low in energy consumption.
As shown in Figure 1, the first resistor R1 in the current collection circuit is precision resistance, connect in the second current transformer
The output end of CT2.
Third capacitor (C3) and the 4th resistance (R4) in the current collection circuit of the utility model embodiment are connected in
Amplification factor, third capacitor C3 is arranged in the negative input end and output end of operational amplifier (U1), 3rd resistor R3, the 4th resistance R4
For filter capacitor, pole is introduced, amplifier self-excitation is prevented, while constituting low-pass filter with the 4th resistance R4, improves the letter of signal
It makes an uproar ratio.
Further, Current Transmit 1 is straight-through current transformer, and when engineer application, IP degree of protection need to reach
No-load voltage ratio to IP67 or more, this grade takes 300/5.By biggish circulating current scaled down, it is passed to rear class.
Further, Current Transmit 2 is micro-transformer of current, and both ends input, both ends output are chosen when application
Four foot current transformers.Current Transmit 2 will export after the further scaled down of output electric current of Current Transmit 1.
Further, first capacitor C1, the second capacitor C2 are filter capacitor, absorb prime and input bring pulse.
Further, the B output end of the second Current Transmit 2 introduces DC offset voltage V1, through reasonable settings
The voltage value can make all positive signals of the output of amplifier, can be directly entered ADC and carry out analog-to-digital conversion.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations all should belong to the protection scope of the appended claims for the utility model.
Claims (6)
1. a kind of high-tension cable circulating current Acquisition Circuit, which is characterized in that the circuit include the first current transformer (CT1),
Second current transformer (CT2), first resistor (R1), second resistance (R2), 3rd resistor (R3), the 4th resistance (R4), first
Capacitor (C1), the second capacitor (C2), third capacitor (C3), operational amplifier (U1)；
The input terminal of the output end connection the second current transformer (CT2) of first current transformer (CT1)；
First resistor (R1) is connected to the output end of the second current transformer (CT2)；
The A output end of one end connection the second current transformer (CT2) of first capacitor (C1), other end ground connection, it is low to constitute first
Bandpass filter circuit；
The B output end of one termination the second current transformer (CT2) of the second capacitor (C2), other end ground connection constitute the second low pass
Filter circuit；
The A output end of one end connection the second current transformer (CT2) of second resistance (R2), the other end connect operational amplifier
(U1) positive input terminal；
The B output end of one end connection the second current transformer (CT2) of 3rd resistor (R3), the other end connect operational amplifier
(U1) negative input end；
Third capacitor (C3) and the 4th resistance (R4) are connected in the negative input end and output end of operational amplifier (U1), constitute the
Three low-pass filter circuits.
2. high-tension cable circulating current Acquisition Circuit according to claim 1, which is characterized in that the second current transformer
(CT2) B output end introduces DC offset voltage (V1).
3. high-tension cable circulating current Acquisition Circuit according to claim 1, which is characterized in that second resistance (R2) and the
Three resistance (R3), the 4th resistance (R4) parallel impedance match.
4. high-tension cable circulating current Acquisition Circuit according to claim 1, which is characterized in that the first current transformer
It (CT1) is straight-through current transformer, the second current transformer (CT2) is Miniature precision current transformer, the ratio such as the two cascade
Example reduces input current.
5. high-tension cable circulating current Acquisition Circuit according to claim 1, which is characterized in that first resistor (R1) is essence
Cipher telegram resistance.
6. high-tension cable circulating current Acquisition Circuit according to claim 1, which is characterized in that third capacitor (C3) is filter
Wave capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821887480.8U CN209296797U (en) | 2018-11-16 | 2018-11-16 | High-tension cable circulating current Acquisition Circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821887480.8U CN209296797U (en) | 2018-11-16 | 2018-11-16 | High-tension cable circulating current Acquisition Circuit |
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| Publication Number | Publication Date |
|---|---|
| CN209296797U true CN209296797U (en) | 2019-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821887480.8U Active CN209296797U (en) | 2018-11-16 | 2018-11-16 | High-tension cable circulating current Acquisition Circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110907863A (en) * | 2019-12-10 | 2020-03-24 | 湖南优利泰克自动化***有限公司 | Analog input channel wiring state detection method and system |
-
2018
- 2018-11-16 CN CN201821887480.8U patent/CN209296797U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110907863A (en) * | 2019-12-10 | 2020-03-24 | 湖南优利泰克自动化***有限公司 | Analog input channel wiring state detection method and system |
| CN110907863B (en) * | 2019-12-10 | 2022-01-07 | 湖南优利泰克自动化***有限公司 | Analog input channel wiring state detection method and system |
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