CN103018526A - Separating unit for leakage current and capacitive current - Google Patents
Separating unit for leakage current and capacitive current Download PDFInfo
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- CN103018526A CN103018526A CN2012105205225A CN201210520522A CN103018526A CN 103018526 A CN103018526 A CN 103018526A CN 2012105205225 A CN2012105205225 A CN 2012105205225A CN 201210520522 A CN201210520522 A CN 201210520522A CN 103018526 A CN103018526 A CN 103018526A
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- leakage current
- capacitive
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Abstract
The invention discloses a separating unit for a leakage current and a capacitive current. The separating unit for the leakage current and the capacitive current is used to separate a capacitive leakage current from a total leakage current, and comprises an input terminal from which the all current leakage is inputted into the separating unit; an operational amplifier which receives the all current leakage inputted through the input terminal and amplifier the all current leakage; an active filter which receives the amplified total leakage current inputted through the operational amplifier, filters the amplified total leakage current, and outputs a fixed frequency sine wave current; and an output terminal which receives and outputs the fixed frequency sine wave current, the fixed frequency sine wave current relates to the capacitive leakage current. The separating unit for the leakage current and the capacitive current can separate and obtain the capacitive leakage current in the total leakage current through simple circuits, achieve the accurate obtaining of the capacitive leakage current, and improve the detection accuracy of the leakage current and lower the detection cost.
Description
Technical field
The present invention relates to a kind of leakage current measurement technology, be specifically related to a kind of tripping device of leakage current capacity current.
Background technology
The leakage total current (hereinafter to be referred as total current) of leakage current has comprised capacitive leakage current (hereinafter to be referred as capacity current) and two parts of resistive leakage current (hereinafter to be referred as current in resistance property).Wherein current in resistance property is the technical parameter that really reflects the leakage current running status.
Total current and voltage because the detection of current in resistance property conventionally must be sampled by calculating voltage and circuital angle, then utilize the trigonometric function relation to extrapolate current in resistance property.
Current in resistance property generally only accounts for circuital 10%---and 15%, the current in resistance property value error that calculates through twice multiplication is larger.Cause two critical defects of conventional sense method:
1, accuracy of detection relatively poor, can't truly reflect the leakage current duty;
2, testing cost is higher, owing to need to use the high pressure P T of sampled voltage, can't promote.
Summary of the invention
The invention provides a kind of tripping device of leakage current capacity current, from leak total current, separate the capacitive leakage current, accurately to obtain the capacitive leakage current, improve the Leakage Current accuracy of detection, reduce testing cost.
For achieving the above object, the invention provides a kind of tripping device of leakage current capacity current, be used for separating the capacitive leakage current from leaking total current, be characterized in that this tripping device comprises:
Input terminal leaks total current and inputs above-mentioned tripping device by this input terminal;
Operational amplifier, it receives the leakage total current of above-mentioned input terminal input, amplifies leaking total current;
Active filter, it receives the leakage total current through amplifying of operational amplifier output, to carrying out filtering through the leakage total current of amplifying, the sine-wave current of output fixed frequency; And,
Lead-out terminal, its reception is also exported the sine-wave current of above-mentioned fixed frequency, and the sine-wave current of this fixed frequency is the capacitive leakage current.
Above-mentioned active filter is bandpass filter.
The fixed frequency of the sine wave that passes through behind the above-mentioned active filter bandpass filtering is 50 hertz.
Leak total current by the tripping device of input terminal input leakage current capacity current, leak total current and transfer to operational amplifier, operational amplifier amplifies leaking total current, leakage total current through amplifying transfers to active filter, active filter carries out bandpass filtering to this through the leakage total current of amplifying, by the sine-wave current of the fixed frequency that obtains behind the lead-out terminal output bandpass filtering, the sine-wave current of this fixed frequency is the capacitive leakage current.
The tripping device of a kind of leakage current capacity current of the present invention is compared with existing leakage current measurement technology, its advantage is, the present invention is by simple circuit, separate the capacitive leakage current that has obtained to leak in the total current, realize accurately obtaining the capacitive leakage current, improve the Leakage Current accuracy of detection, reduce testing cost.
Description of drawings
Fig. 1 is the circuit diagram of the tripping device of a kind of leakage current capacity current of the present invention.
Embodiment
Below in conjunction with accompanying drawing, further specify specific embodiments of the invention.
As shown in Figure 1, the present invention discloses a kind of tripping device of leakage current capacity current for separating the capacitive leakage current from leaking total current.
This tripping device comprises: input terminal IN, operational amplifier A, active filter B and lead-out terminal OUT.
Input terminal IN circuit of output terminal concatenation operation amplifier A input end leaks total current by this input terminal IN input separation unit.
The model of operational amplifier A is TL062, and this operational amplifier A receives the leakage total current of input terminal IN input, amplifies leaking total current.
In the present embodiment, it is the wave filter with bandpass characteristics of FW302 that active filter B adopts model, and the fixed frequency of the sine wave that permission is passed through behind this active filter B bandpass filtering is 50 hertz.Active filter B inlet circuit concatenation operation amplifier A output terminal receives the leakage total current through amplifying that operational amplifier A is exported, and to carrying out filtering through the leakage total current of amplifying, the output fixed frequency is 50 hertz sine-wave current.
Leak total current and formed by sinusoidal wave capacity current and the nonlinear current in resistance property of fixed frequency, through active filter B output be the sine-wave current of fixed frequency, i.e. capacitive leakage current.
Lead-out terminal OUT inlet circuit is connected with the output terminal of source filter B, and the fixed frequency of this lead-out terminal OUT reception and output process active filter B filtering is 50 hertz sine-wave current, and the sine-wave current of this fixed frequency is the capacitive leakage current.
Although content of the present invention has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (3)
1. the tripping device of a leakage current capacity current is used for separating the capacitive leakage current from leaking total current, it is characterized in that this tripping device comprises:
Input terminal (IN) leaks total current and inputs described tripping device by this input terminal (IN);
Operational amplifier (A), it receives the leakage total current of described input terminal (IN) input, amplifies leaking total current;
Active filter (B), it receives the leakage total current through amplifying of operational amplifier (A) output, to carrying out filtering through the leakage total current of amplifying, the sine-wave current of output fixed frequency; And,
Lead-out terminal (OUT), its reception is also exported the sine-wave current of described fixed frequency, and the sine-wave current of this fixed frequency is the capacitive leakage current.
2. the tripping device of leakage current capacity current as claimed in claim 1 is characterized in that, described active filter (B) is bandpass filter.
3. the tripping device of leakage current capacity current as claimed in claim 2 is characterized in that, the fixed frequency of the sine wave that passes through behind described active filter (B) bandpass filtering is 50 hertz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105205225A CN103018526A (en) | 2012-12-07 | 2012-12-07 | Separating unit for leakage current and capacitive current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105205225A CN103018526A (en) | 2012-12-07 | 2012-12-07 | Separating unit for leakage current and capacitive current |
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| Publication Number | Publication Date |
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| CN103018526A true CN103018526A (en) | 2013-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012105205225A Pending CN103018526A (en) | 2012-12-07 | 2012-12-07 | Separating unit for leakage current and capacitive current |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267883A (en) * | 2013-05-11 | 2013-08-28 | 桂林理工大学 | Leakage current detection method for bipolar square-wave impulse voltage insulation life experiment |
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| JP2003232816A (en) * | 2002-02-08 | 2003-08-22 | Seiko Instruments Inc | Current detection circuit |
| JP2011149926A (en) * | 2009-12-24 | 2011-08-04 | Fuji Electric Co Ltd | Current detection circuit of power semiconductor device |
| CN102654526A (en) * | 2011-03-03 | 2012-09-05 | 上海诚佳电子科技有限公司 | Capacitative current separating circuit of insulator |
| CN102654525A (en) * | 2011-03-03 | 2012-09-05 | 上海诚佳电子科技有限公司 | Insulator resistive current separation circuit |
| CN102654527A (en) * | 2011-03-03 | 2012-09-05 | 上海诚佳电子科技有限公司 | Insulator resistive current peak detection circuit |
| CN202975117U (en) * | 2012-12-07 | 2013-06-05 | 上海市电力公司 | Capacitive-current separating apparatus for leakage current |
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2012
- 2012-12-07 CN CN2012105205225A patent/CN103018526A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003232816A (en) * | 2002-02-08 | 2003-08-22 | Seiko Instruments Inc | Current detection circuit |
| JP2011149926A (en) * | 2009-12-24 | 2011-08-04 | Fuji Electric Co Ltd | Current detection circuit of power semiconductor device |
| CN102654526A (en) * | 2011-03-03 | 2012-09-05 | 上海诚佳电子科技有限公司 | Capacitative current separating circuit of insulator |
| CN102654525A (en) * | 2011-03-03 | 2012-09-05 | 上海诚佳电子科技有限公司 | Insulator resistive current separation circuit |
| CN102654527A (en) * | 2011-03-03 | 2012-09-05 | 上海诚佳电子科技有限公司 | Insulator resistive current peak detection circuit |
| CN202975117U (en) * | 2012-12-07 | 2013-06-05 | 上海市电力公司 | Capacitive-current separating apparatus for leakage current |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267883A (en) * | 2013-05-11 | 2013-08-28 | 桂林理工大学 | Leakage current detection method for bipolar square-wave impulse voltage insulation life experiment |
| CN103267883B (en) * | 2013-05-11 | 2015-05-20 | 桂林理工大学 | Leakage current detection method for bipolar square-wave impulse voltage insulation life experiment |
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Application publication date: 20130403 |