CN103513096A - H type filter capacitor group imbalance current detection device - Google Patents
H type filter capacitor group imbalance current detection device Download PDFInfo
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- CN103513096A CN103513096A CN201310484577.XA CN201310484577A CN103513096A CN 103513096 A CN103513096 A CN 103513096A CN 201310484577 A CN201310484577 A CN 201310484577A CN 103513096 A CN103513096 A CN 103513096A
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- capacitor group
- filter capacitor
- type filter
- balance current
- low noise
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- 239000003990 capacitor Substances 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 title abstract description 6
- 238000005070 sampling Methods 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 3
- 238000003556 assay Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The invention relates to an H type filter capacitor group imbalance current detection device. The device is characterized in that the device comprises a frequency synthesizer, a power amplifier, a sampling resistor, a low noise amplifier, an A/D converter and a digital processor. The frequency synthesizer is connected with the power amplifier. The sampling resistor is connected with the low noise amplifier, the A/D converter and the digital processor in turn. The device provided by the invention has the advantages that by applying high-frequency voltage on a detected capacitor group, the magnitude of imbalance current is improved; through the acquisition and the processing of a digital circuit, the imbalance current which is originally small is detected; and compared with the existing detection method using a booster and a microammeter, the device provided by the invention has the advantages of safety, reliability and high precision.
Description
Technical field
The present invention relates to a kind of H type filter capacitor group out-of-balance current checkout equipment.
Background technology
HVDC (High Voltage Direct Current) transmission system is the important component part of current electrical network, has realized remote, the jumbo transmission of electric power, and alternating current-direct current wave filter is as one of visual plant of this system, its safety, reliably move significant.The protection of alternating current-direct current wave filter is mainly the unbalance protection to its middle-and high-voltage capacitor group, by the out-of-balance current of Detection capacitance device group, judges whether capacitor group exists fault, thereby takes corresponding safeguard measure.In common alternating current-direct current wave filter, capacitor group is H bridge connected mode: referring to Fig. 1, four capacitor C 1, C2, C3, C4 have formed a H type capacitor group the simplest by connection in series-parallel, A1, A2 termination enter after measuring voltage, can directly measure the out-of-balance current of this H type capacitor group from B1, B2 end.
The mode that general employing stepup transformer adds microampere meter is at present to such capacitor group out-of-balance current test, because out-of-balance current is less, therefore, by stepup transformer to the exert pressure high voltage of several hectovolts of measured capacitance device group, promote the size of out-of-balance current, thereby detect less out-of-balance current.But stepup transformer weight is large, and voltage is high, both dangerous also inconvenient for tester, and because the internal resistance of microampere meter is very large, can cause the error of measuring current larger.
Summary of the invention
For overcoming the deficiencies in the prior art, the object of this invention is to provide a kind of H type filter capacitor group out-of-balance current checkout equipment, realize safely, detect reliably, easily H type filter capacitor group out-of-balance current.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of H type filter capacitor group out-of-balance current checkout equipment, it is characterized in that, comprise frequency synthesizer, power amplifier, sample resistance, low noise amplifier, A/D converter, digital processing unit, frequency synthesizer is connected with power amplifier, and sample resistance is connected with low noise amplifier, A/D converter, digital processing unit successively.
Described low noise amplifier two ends also connect feedback resistance.
Between described A/D converter and digital processing unit, be connected in series bandpass filter,
Described frequency synthesizer is DDS Direct Digital Synthesizer.
Compared with prior art, the invention has the beneficial effects as follows:
By measured capacitance device group is applied to HF voltage, promote the size of out-of-balance current, through digital circuit collection, processing, detect originally small out-of-balance current, the detection mode that adds microampere meter compared to existing stepup transformer, the advantage that the present invention has safely, reliable, precision is high.
Accompanying drawing explanation
Fig. 1 is capacitor group H bridge connected mode schematic diagram in alternating current-direct current wave filter.
Fig. 2 is a kind of H type filter capacitor group out-of-balance current assay device structures block diagram.
Fig. 3 is a kind of H type filter capacitor group out-of-balance current assay device structures block diagram.
Embodiment
Below in conjunction with Figure of description, the present invention is described in detail, but should be noted that enforcement of the present invention is not limited to following embodiment.
H type filter capacitor group out-of-balance current checkout equipment 10, see Fig. 2, comprise frequency synthesizer 101, power amplifier 102, sample resistance 103, low noise amplifier 104, A/D converter 105 and digital processing unit 106, frequency synthesizer 101 is connected with H type capacitor group through power amplifier 102, and H type capacitor group is also connected with low noise amplifier 104, A/D converter 105 and digital processing unit 106 successively through sample resistance 103.
The type of H shown in Fig. 1 filter capacitor group of take is example, the course of work of checkout equipment 10 is: the ac voltage signal that frequency synthesizer 101 produces apparently higher than 50Hz mains frequency, frequency range can be 500～1000Hz, this ac voltage signal is loaded on the A1 of H type filter capacitor group after power amplifier 102 amplifies, A2 end, by sample resistance 103 acquisition stream through B1, the out-of-balance current of B2 end, this out-of-balance current is after low noise amplifier 104 amplifies, by A/D converter 105, carry out analog to digital conversion and import digital processing unit 106 into, finally by digital processing unit 106, be reduced to the small out-of-balance current that H type filter capacitor group itself produces, thereby reach the object of accurate detection H type filter capacitor group out-of-balance current.
In order to detect more accurately the out-of-balance current of H type filter capacitor group, see Fig. 3, H type filter capacitor group out-of-balance current checkout equipment 20, be with checkout equipment 10 differences, checkout equipment 20 also comprises feedback resistance 201, be connected to low noise amplifier 104 two ends, for feedback, collect out-of-balance current, low noise amplifier 104 is adjusted output gain automatically according to this feedback, and comprise bandpass filter 202, for choosing the out-of-balance current in certain frequency, thereby improve the accurate rate that out-of-balance current detects.
Claims (4)
1. a H type filter capacitor group out-of-balance current checkout equipment, it is characterized in that, comprise frequency synthesizer, power amplifier, sample resistance, low noise amplifier, A/D converter, digital processing unit, frequency synthesizer is connected with power amplifier, and sample resistance is connected with low noise amplifier, A/D converter, digital processing unit successively.
2. a kind of H type filter capacitor group out-of-balance current checkout equipment according to claim 1, is characterized in that, described low noise amplifier two ends also connect feedback resistance.
3. a kind of H type filter capacitor group out-of-balance current checkout equipment according to claim 1 and 2, is characterized in that, between described A/D converter and digital processing unit, is connected in series bandpass filter.
4. a kind of H type filter capacitor group out-of-balance current checkout equipment according to claim 1, is characterized in that, described frequency synthesizer is DDS Direct Digital Synthesizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310484577.XA CN103513096A (en) | 2013-10-16 | 2013-10-16 | H type filter capacitor group imbalance current detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310484577.XA CN103513096A (en) | 2013-10-16 | 2013-10-16 | H type filter capacitor group imbalance current detection device |
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| Publication Number | Publication Date |
|---|---|
| CN103513096A true CN103513096A (en) | 2014-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310484577.XA Pending CN103513096A (en) | 2013-10-16 | 2013-10-16 | H type filter capacitor group imbalance current detection device |
Country Status (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030931A (en) * | 2018-08-22 | 2018-12-18 | 延安大学 | Current signal detecting device based on Arduino single-chip microcontroller |
| CN109787233A (en) * | 2019-01-09 | 2019-05-21 | 中国南方电网有限责任公司超高压输电公司广州局 | A kind of filter high-voltage capacitance H-type bridge arm leveling method |
-
2013
- 2013-10-16 CN CN201310484577.XA patent/CN103513096A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030931A (en) * | 2018-08-22 | 2018-12-18 | 延安大学 | Current signal detecting device based on Arduino single-chip microcontroller |
| CN109787233A (en) * | 2019-01-09 | 2019-05-21 | 中国南方电网有限责任公司超高压输电公司广州局 | A kind of filter high-voltage capacitance H-type bridge arm leveling method |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140115 |
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| WD01 | Invention patent application deemed withdrawn after publication |