CN102654525A - Insulator resistive current separation circuit - Google Patents
Insulator resistive current separation circuit Download PDFInfo
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- CN102654525A CN102654525A CN2011100514641A CN201110051464A CN102654525A CN 102654525 A CN102654525 A CN 102654525A CN 2011100514641 A CN2011100514641 A CN 2011100514641A CN 201110051464 A CN201110051464 A CN 201110051464A CN 102654525 A CN102654525 A CN 102654525A
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- insulator
- current
- transport
- placing device
- separation circuit
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention provides an insulator resistive current separation circuit, which comprises a first operational amplifier, a filter and a second operational amplifier, wherein the insulator leakage total current is input by a positive phase input end of the first operational amplifier; the input end of the filter is connected with the output end of the first operational amplifier; the output end of the filter is connected to the inverted input end of the second operational amplifier; and the insulator leakage total current is input by a positive phase input end of the second operational amplifier. According to the insulator resistive current separation circuit provided by the invention, the input leakage total current can be amplified by the operational amplifier, the capacitive current separation of the insulator can be realized by a band-pass filtering function of the filter, and the insulator resistive current is separated by the operational amplifier so as to improve the insulator resistive current detection precision. Meanwhile, the insulator resistive current separation circuit can sample the voltage without high voltage potential transformation (PT), and therefore the detection cost of the insulator resistive current is reduced.
Description
[technical field]
The invention belongs to electric and electronic technical field, relate in particular to a kind of insulator current in resistance property separation circuit.
[background technology]
The pollution flashover of the insulator chain of ultra-high-tension power transmission line is one of key factor that influences operation of power networks.Along with the aggravation of power system development and all kinds of pollutions, the pollution flashover accident is serious day by day, and it seriously hampers safe, stable, the economical operation of electric system.Closely-related with the insulator degree is the size of its leakage current, and therefore the detection to insulator leakage current has very practical meaning.
The leakage full current of insulator has comprised capacitive leakage current (abbreviation capacity current) and two parts of resistive leakage current (abbreviation current in resistance property); Wherein, Current in resistance property is the technical parameter that really reflects the insulator running status, and the detection of capacity current needs capacity current from total current, to separate.
And the detection of current in resistance property must sample total current and voltage again through calculating voltage and circuital angle, utilize the trigonometric function relation to extrapolate the size of current in resistance property at last.
Though this detection method can obtain the size of current in resistance property, also exist following defective:
First; Because the leakage full current of insulator has only microampere order under the normal condition; And current in resistance property generally only accounts for circuital 10%-15%; Said method need pass through calculating voltage and circuital angle and utilize trigonometric function relation to calculate current in resistance property, and the current in resistance property value error that calculates through twice multiplication is bigger, thereby accuracy of detection is relatively poor, can't truly reflect the insulator work state;
The second, be low-voltage owing to need use the high pressure P T of sampled voltage to be about to high-voltage variable in the above-mentioned detection method, thereby it is higher to detect cost, can't promote.
[summary of the invention]
The purpose of the embodiment of the invention is to provide a kind of insulator current in resistance property separation circuit, is intended to solve relatively poor, the cost problem of higher of precision in the existing insulator current in resistance property detection.
The embodiment of the invention is to realize like this; A kind of insulator current in resistance property separation circuit comprises first transport and placing device, wave filter and second transport and placing device, wherein; The sub-leakage full current of normal phase input end isolated input of said first transport and placing device; The input end of said wave filter links to each other with the output terminal of first transport and placing device, and the output terminal of said wave filter is connected in the inverting input of said second transport and placing device, the sub-leakage full current of normal phase input end isolated input of said second transport and placing device.
Insulator current in resistance property separation circuit provided by the invention amplifies the leakage full current of input through transport and placing device; And effect through the wave filter bandpass filtering; Realized that the insulator capacity current separates; Amplify through transport and placing device again and isolate the insulator current in resistance property, thereby improved insulator current in resistance property accuracy of detection; Simultaneously need not to carry out high pressure P T during sampled voltage, reduced the detection cost of insulator current in resistance property.
[description of drawings]
Fig. 1 is the circuit diagram of the insulator current in resistance property separation circuit that provides of the embodiment of the invention.
[embodiment]
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The insulator current in resistance property separation circuit that the embodiment of the invention provides can be applied to insulator current in resistance property monitoring with detect.Fig. 1 shows the circuit diagram of the insulator current in resistance property separation circuit that the embodiment of the invention provides; For the ease of explanation, only show the part relevant with the embodiment of the invention, details are as follows.
Insulator current in resistance property separation circuit comprises: first transport and placing device 10 and wave filter 20 and second transport and placing device 30; Wherein, The sub-leakage full current of normal phase input end isolated input of first transport and placing device 10; The input end of wave filter 20 links to each other with the output terminal of transport and placing device 10, and the output terminal of wave filter 20 is connected in the inverting input of second transport and placing device 30, the sub-leakage full current of normal phase input end isolated input of second transport and placing device 30.
Wherein, wave filter 20 is for having the active filter of bandpass characteristics, and it allows the sine wave of fixed frequency to pass through.
For explanation the object of the invention further, to combine Fig. 1 that the principle of work of the insulator current in resistance property separation circuit that the embodiment of the invention provides is detailed following at present:
Insulator leakage full current I
XBehind the normal phase input end of input transport and placing device 10, since the amplification of transport and placing device A, insulator leakage full current I
XOutput terminal from first transport and placing device 10 after being exaggerated is input to wave filter 20.Wave filter 20 is an active filter, and its cutoff frequency is 50Hz, and promptly it is output as the sine wave that fixed frequency is 50Hz, because insulator leakage full current I
XSinusoidal wave capacity current and nonlinear current in resistance property by fixed frequency are formed, and the insulator total current after the amplification is output as the sine-wave current that fixed frequency is 50Hz through BPF. 20 filtering, promptly obtains insulator capacity current I
C
Then, insulator capacity current I
COutput to the inverting input of second transport and placing device 30, will be amplified by second transport and placing device 30.And insulator leakage full current I
XFrom the normal phase input end input of second transport and placing device 30, and amplify.So output end current I of second transport and placing device 30
R=I
X-I
C, promptly obtain the insulator current in resistance property.
The model of first transport and placing device 10 and second transport and placing device 30 is TL062 in the present embodiment, and the model of said wave filter 20 is FW302.
Than prior art; The insulator current in resistance property separation circuit that the embodiment of the invention provides amplifies the leakage full current of input through transport and placing device; And effect through the wave filter bandpass filtering; Realized that the insulator capacity current separates, amplified through transport and placing device again and isolate the insulator current in resistance property, thereby improved insulator current in resistance property accuracy of detection; Simultaneously need not to carry out high pressure P T during sampled voltage, reduced the detection cost of insulator current in resistance property.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. insulator current in resistance property separation circuit; It is characterized in that, comprise first transport and placing device, wave filter and second transport and placing device, wherein; The sub-leakage full current of normal phase input end isolated input of said first transport and placing device; The input end of said wave filter links to each other with the output terminal of first transport and placing device, and the output terminal of said wave filter is connected in the inverting input of said second transport and placing device, the sub-leakage full current of normal phase input end isolated input of said second transport and placing device.
2. insulator current in resistance property separation circuit as claimed in claim 1 is characterized in that said wave filter is an active filter, and its cutoff frequency is 50Hz.
3. insulator current in resistance property separation circuit as claimed in claim 1 is characterized in that the model of said first transport and placing device and second transport and placing device is TL062.
4. according to claim 1 or claim 2 insulator current in resistance property separation circuit is characterized in that the model of said wave filter is FW302.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100514641A CN102654525A (en) | 2011-03-03 | 2011-03-03 | Insulator resistive current separation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100514641A CN102654525A (en) | 2011-03-03 | 2011-03-03 | Insulator resistive current separation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102654525A true CN102654525A (en) | 2012-09-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100514641A Pending CN102654525A (en) | 2011-03-03 | 2011-03-03 | Insulator resistive current separation circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944726A (en) * | 2012-12-07 | 2013-02-27 | 上海市电力公司 | Device for separating resistive current from leakage current |
| CN103018526A (en) * | 2012-12-07 | 2013-04-03 | 上海市电力公司 | Separating unit for leakage current and capacitive current |
| CN103604976A (en) * | 2013-11-19 | 2014-02-26 | 国家电网公司 | Power transmission line insulator internal resistive current measuring method |
-
2011
- 2011-03-03 CN CN2011100514641A patent/CN102654525A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944726A (en) * | 2012-12-07 | 2013-02-27 | 上海市电力公司 | Device for separating resistive current from leakage current |
| CN103018526A (en) * | 2012-12-07 | 2013-04-03 | 上海市电力公司 | Separating unit for leakage current and capacitive current |
| CN103604976A (en) * | 2013-11-19 | 2014-02-26 | 国家电网公司 | Power transmission line insulator internal resistive current measuring method |
| CN103604976B (en) * | 2013-11-19 | 2016-05-04 | 国家电网公司 | The inner current in resistance property measuring method of electric transmission line isolator |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120905 |