CN102654527A - Insulator resistive current peak detection circuit - Google Patents
Insulator resistive current peak detection circuit Download PDFInfo
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- CN102654527A CN102654527A CN201110051468XA CN201110051468A CN102654527A CN 102654527 A CN102654527 A CN 102654527A CN 201110051468X A CN201110051468X A CN 201110051468XA CN 201110051468 A CN201110051468 A CN 201110051468A CN 102654527 A CN102654527 A CN 102654527A
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- transport
- placing device
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Abstract
The invention provides an insulator resistive current peak detection circuit, comprising a resistive current separation unit and a resistive current peak detection unit, wherein resistive current is separated from input insulator leakage total current through the resistive current separation unit; and the separated resistive current is subjected to detection by the resistive current peak detection unit to detect the peak size of the resistive current. The insulator resistive current peak detection circuit disclosed by the embodiment of the invention realizes insulator capacitative current separation, the peak of the resistive current of the insulator can be relatively accurately detected and the detection precision of the resistive current of the insulator is improved; and meanwhile, high voltage PT does not need to be carried out in a voltage sampling process and the detection cost of the resistive current of the insulator 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 peak-detector 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.
The 3rd, lack effective detection method for the current in resistance property peak value.
[summary of the invention]
The purpose of the embodiment of the invention is to provide a kind of insulator current in resistance property peak-detector circuit, is intended to solve relatively poor, the cost problem of higher of precision in the existing insulator current in resistance property peak value detection.
The embodiment of the invention is to realize like this; A kind of insulator current in resistance property peak-detector circuit; Comprise current in resistance property separative element and current in resistance property peak detection unit; The insulator leakage full current of input is isolated current in resistance property through the current in resistance property separative element, and isolated current in resistance property detects the peak value size of current in resistance property again through the current in resistance property peak detection unit.
Further; In above-mentioned insulator current in resistance property peak-detector circuit, said current in resistance property separative element 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.
Further; In above-mentioned insulator current in resistance property peak-detector circuit, said current in resistance property peak detection unit comprises the 3rd transport and placing device, diode, FET, wherein; The normal phase input end of said the 3rd transport and placing device is connected in the output terminal of said second transport and placing device; The output terminal of said the 3rd transport and placing device is connected in the anode of said diode, and the negative electrode of said diode is the output terminal of insulator current in resistance property peak-detector circuit, and the negative electrode of said diode is connected in the drain electrode of FET; The source ground of said FET, the external control voltage of the grid of said FET.
Further, in above-mentioned insulator current in resistance property peak-detector circuit, said wave filter is an active filter, and its cutoff frequency is 50Hz.
Further, in above-mentioned insulator current in resistance property peak-detector circuit, the model of said wave filter is FW302.
Further, in above-mentioned insulator current in resistance property peak-detector circuit, the model of said first transport and placing device and second transport and placing device is TL062.
Further, in above-mentioned insulator current in resistance property peak-detector circuit, the model of said the 3rd transport and placing device is TL062.
Further, in above-mentioned insulator current in resistance property peak-detector circuit, the model of said diode is N4007, and said FET model is 3DJ6.
The insulator current in resistance property peak-detector 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, through FET and external voltage control charging and discharge are set at the current in resistance property output terminal; Thereby more accurately insulator current in resistance property peak value is detected, 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 peak-detector 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 peak-detector 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 peak-detector 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 peak-detector circuit comprises current in resistance property separative element 100 and current in resistance property peak detection unit 200; The insulator leakage full current of input is isolated current in resistance property through current in resistance property separative element 100, and isolated current in resistance property detects the peak value size of current in resistance property again through current in resistance property peak detection unit 200.
Current in resistance property separative element 100 comprises first transport and placing device 10 and the 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.
Current in resistance property peak detection unit 200 comprises the 3rd transport and placing device 40, diode 50, FET 60.Wherein, the normal phase input end of the 3rd transport and placing device 40 is connected in the output terminal of second transport and placing device 30, and the output terminal of the 3rd transport and placing device 40 is connected in the anode of diode 50, and the negative electrode of diode 50 is the output terminal I of insulator current in resistance property peak-detector circuit
o, and the negative electrode of diode 50 is connected in the drain electrode of FET 60, the source ground of FET 60, the external control voltage of the grid of FET 60 K.
For explanation the object of the invention further, to combine Fig. 1 that the principle of work of the insulator current in resistance property peak-detector 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.
Insulator current in resistance property I
rFrom the normal phase input end input of the 3rd transport and placing device 40, exported through diode 50 after 40 amplifications of the 3rd transport and placing device, simultaneously, the output terminal I of said peak-detector circuit
oAlso through FET 60 ground connection.The external control voltage of the grid of FET 60 K during test, will control voltage K earlier and be adjusted to low level, insulator current in resistance property I
rThrough the equivalent capacity charging of 50 pairs of FETs 60 of diode, because the unidirectional conducting effect of diode 50, the drain electrode electric charge of FET 60 is constantly accumulated, the output terminal I of peak-detector circuit described in the charging process
oMaximal value is the peak value of resistive leakage current; Behind to be detected the finishing, will control voltage K again and be adjusted to high level, FET 60 will discharge, and discharge charges accumulated, wait for again and detect.
The model of first transport and placing device 10, second transport and placing device 30 and the 3rd transport and placing device 40 is TL062 in the present embodiment, and the model of said wave filter 20 is FW302, and the model of diode 50 is N4007, and FET 60 models are 3DJ6.
Than prior art; The insulator current in resistance property peak-detector 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, through FET and external voltage control charging and discharge are set at the current in resistance property output terminal; Thereby more accurately insulator current in resistance property peak value is detected, 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 (8)
1. insulator current in resistance property peak-detector circuit; It is characterized in that; Comprise current in resistance property separative element and current in resistance property peak detection unit; The insulator leakage full current of input is isolated current in resistance property through the current in resistance property separative element, and isolated current in resistance property detects the peak value size of current in resistance property again through the current in resistance property peak detection unit.
2. insulator current in resistance property peak-detector circuit as claimed in claim 1; It is characterized in that; Said current in resistance property separative element 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; 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.
3. insulator current in resistance property peak-detector circuit as claimed in claim 1; It is characterized in that said current in resistance property peak detection unit comprises the 3rd transport and placing device, diode, FET, wherein; The normal phase input end of said the 3rd transport and placing device is connected in the output terminal of said second transport and placing device; The output terminal of said the 3rd transport and placing device is connected in the anode of said diode, and the negative electrode of said diode is the output terminal of insulator current in resistance property peak-detector circuit, and the negative electrode of said diode is connected in the drain electrode of FET; The source ground of said FET, the external control voltage of the grid of said FET.
4. insulator current in resistance property peak-detector circuit as claimed in claim 1 is characterized in that said wave filter is an active filter, and its cutoff frequency is 50Hz.
5. like claim 2 or 4 described insulator current in resistance property peak-detector circuits, it is characterized in that the model of said wave filter is FW302.
6. insulator current in resistance property peak-detector circuit as claimed in claim 2 is characterized in that the model of said first transport and placing device and second transport and placing device is TL062.
7. insulator current in resistance property peak-detector circuit as claimed in claim 3 is characterized in that the model of said the 3rd transport and placing device is TL062.
8. insulator current in resistance property peak-detector circuit as claimed in claim 3 is characterized in that the model of said diode is N4007, and said FET model is 3DJ6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110051468XA CN102654527A (en) | 2011-03-03 | 2011-03-03 | Insulator resistive current peak detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110051468XA CN102654527A (en) | 2011-03-03 | 2011-03-03 | Insulator resistive current peak detection circuit |
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| CN102654527A true CN102654527A (en) | 2012-09-05 |
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|---|---|---|---|
| CN201110051468XA Pending CN102654527A (en) | 2011-03-03 | 2011-03-03 | Insulator resistive current peak detection circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018526A (en) * | 2012-12-07 | 2013-04-03 | 上海市电力公司 | Separating unit for leakage current and capacitive current |
| CN103575972A (en) * | 2013-11-19 | 2014-02-12 | 国家电网公司 | Internal resistive current measurement system of electric transmission line insulator |
| 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 CN201110051468XA patent/CN102654527A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018526A (en) * | 2012-12-07 | 2013-04-03 | 上海市电力公司 | Separating unit for leakage current and capacitive current |
| CN103575972A (en) * | 2013-11-19 | 2014-02-12 | 国家电网公司 | Internal resistive current measurement system of electric transmission line insulator |
| 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 |
| CN103575972B (en) * | 2013-11-19 | 2016-05-04 | 国家电网公司 | The inner current in resistance property measuring system of electric transmission line isolator |
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Application publication date: 20120905 |