CN203465376U - Electric power-used adaptive frequency-selection impedance partial discharge detector - Google Patents
Electric power-used adaptive frequency-selection impedance partial discharge detector Download PDFInfo
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- CN203465376U CN203465376U CN201120241765.6U CN201120241765U CN203465376U CN 203465376 U CN203465376 U CN 203465376U CN 201120241765 U CN201120241765 U CN 201120241765U CN 203465376 U CN203465376 U CN 203465376U
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Abstract
The utility model relates to an electric power-used adaptive frequency-selection impedance partial discharge detector. The electric power-used adaptive frequency-selection impedance partial discharge detector comprises a pulse current signal input module, a fast Fourier transform module, an adaptive optimal impedance frequency band searching module and a partial discharge test module; the pulse current signal input module is connected with the fast Fourier transform module; the fast Fourier transform module is connected with the adaptive optimal impedance frequency band searching module; and the adaptive optimal impedance frequency band searching module is connected with the partial discharge test module. The electric power-used adaptive frequency-selection impedance partial discharge detector of the utility model is simple and convenient to operate, can adaptively select the frequency band and center frequency band of measurement impedance, and can be widely applied to insulation state detection of electrical equipment.
Description
Technical field
The utility model relates to a kind of PD meter, relates in particular to adaptive frequency-selecting impedance PD meter for a kind of electric power.
Background technology
Partial discharge phenomenon is that charged electrical equipment local electric field strength is too concentrated the endemism show, usually by electric power research worker and power test worker for diagnosing the means of insulation of electrical installation defect.These means are mainly while utilizing partial discharge phenomenon to produce, to be attended by pulse current of PD, when pulse current flows through in circuit because its signal is comparatively faint, therefore the collection of its useful signal must be carried out conventionally in specific circuit, conventionally has multiple process, series process and balancing method.
The use of these methods is very ripe, but the PD meter ubiquity that said method is used is measured impedance frequency band selection problem blindly, some PD meter adopts frequency band and the centre frequency of selecting manually impedance, some is not select frequency band and centre frequency, yet the non-constant width of the frequency range of partial discharge pulse's signal, therefore be necessary to select the centre frequency of higher signal to noise ratio (S/N ratio) and frequency band as the basis of measuring local discharge signal, significant for Obtaining Accurate pulsed current signal.
Summary of the invention
For adaptively selected PD meter is measured centre frequency and the bandwidth of impedance, thereby more effectively extract useful signal, the utility model provides adaptive frequency-selecting impedance PD meter for a kind of electric power, comprise pulsed current signal load module, fast Fourier transform module, self-adaptation is found optimum impedance frequency band module, test module is put in office, wherein to find optimum impedance frequency band module can be to arrange to measure impedance centre frequency to self-adaptation, find the module of the bandwidth that signal to noise ratio (S/N ratio) is the highest, also can be that Measurement bandwidth is set, find the module of the centre frequency that signal to noise ratio (S/N ratio) is the highest, can also be not carry out any setting, the measurement impedance centre frequency that system automatic search signal to noise ratio (S/N ratio) is the highest and the module of bandwidth, electric power is connected with measurement impedance with the hardware of adaptive frequency-selecting impedance PD meter, electric power is connected with fast Fourier transform module with the pulsed current signal load module of adaptive frequency-selecting impedance PD meter, fast Fourier transform module is found optimum impedance frequency band module with self-adaptation and is connected, and self-adaptation is found optimum impedance frequency band module and put test module and be connected with office, electric power exports the pulsed current signal of the electrical equipment obtaining by measurement impedance to fast Fourier transform module with the pulsed current signal load module of adaptive frequency-selecting impedance PD meter, fast Fourier transform module transfers to self-adaptation by transformation results and finds optimum impedance frequency band module, self-adaptation is found optimum impedance band modal block adaptive and is found optimum impedance frequency band, and test module is put in the optimum impedance frequency band data office of exporting to searching out, office puts test module and carries out office and put test.
The beneficial effects of the utility model are: simple, convenient; Frequency band and centre frequency that can adaptively selected measurement impedance, the state of insulation that can be widely used in electrical equipment detects.
Accompanying drawing explanation
Fig. 1 is adaptive frequency-selecting impedance PD meter and hookup schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, describe adaptive frequency-selecting impedance PD meter for a kind of electric power of the present utility model in detail.
As shown in Fig. 1, electric power is connected with measurement impedance 5 by signal cable 6 with adaptive frequency-selecting impedance PD meter 1; Measure impedance 5 one end and be connected with coupling capacitance 4, other end ground connection; Electrical equipment 9 one end are connected with coupling capacitance 4 with high-voltage power supply 3, other end ground connection.
Adaptive frequency-selecting impedance PD meter for electric power, comprise that pulsed current signal load module, fast Fourier transform module, self-adaptation are found optimum impedance frequency band module, test module is put in office, wherein to find optimum impedance frequency band module can be that the module of measuring impedance centre frequency, finding the bandwidth that signal to noise ratio (S/N ratio) is the highest is set to self-adaptation, also can be the module that Measurement bandwidth is set, finds the centre frequency that signal to noise ratio (S/N ratio) is the highest, can also be not carry out the highest measurement impedance centre frequency of any setting, system automatic search signal to noise ratio (S/N ratio) and the module of bandwidth; Electric power is connected with measurement impedance with the hardware of adaptive frequency-selecting impedance PD meter, electric power is connected with fast Fourier transform module with the pulsed current signal load module of adaptive frequency-selecting impedance PD meter, fast Fourier transform module is found optimum impedance frequency band module with self-adaptation and is connected, and self-adaptation is found optimum impedance frequency band module and put test module and be connected with office; Electric power exports the pulsed current signal of the electrical equipment obtaining by measurement impedance to fast Fourier transform module with the pulsed current signal load module of adaptive frequency-selecting impedance PD meter, fast Fourier transform module transfers to self-adaptation by transformation results and finds optimum impedance frequency band module, self-adaptation is found optimum impedance band modal block adaptive and is found optimum impedance frequency band, and test module is put in the optimum impedance frequency band data office of exporting to searching out, office puts test module and carries out office and put test.
Claims (4)
1. an adaptive frequency-selecting impedance PD meter for electric power, is characterized in that, comprises that pulsed current signal load module, fast Fourier transform module, self-adaptation are found optimum impedance frequency band module, test module is put in office; Pulsed current signal load module is connected with fast Fourier transform module, and fast Fourier transform module is found optimum impedance frequency band module with self-adaptation and is connected, and self-adaptation is found optimum impedance frequency band module and put test module and be connected with office.
2. adaptive frequency-selecting impedance PD meter for a kind of electric power as described in claim 1, is characterized in that, it is that the module of measuring impedance centre frequency, finding the bandwidth that signal to noise ratio (S/N ratio) is the highest is set that described self-adaptation is found optimum impedance frequency band module.
3. adaptive frequency-selecting impedance PD meter for a kind of electric power as described in claim 1, is characterized in that, it is the module that Measurement bandwidth is set, finds the centre frequency that signal to noise ratio (S/N ratio) is the highest that described self-adaptation is found optimum impedance frequency band module.
4. adaptive frequency-selecting impedance PD meter for a kind of electric power as described in claim 1, it is characterized in that, it is not carry out the highest measurement impedance centre frequency of any setting, system automatic search signal to noise ratio (S/N ratio) and the module of bandwidth that described self-adaptation is found optimum impedance frequency band module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120241765.6U CN203465376U (en) | 2011-07-11 | 2011-07-11 | Electric power-used adaptive frequency-selection impedance partial discharge detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120241765.6U CN203465376U (en) | 2011-07-11 | 2011-07-11 | Electric power-used adaptive frequency-selection impedance partial discharge detector |
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| Publication Number | Publication Date |
|---|---|
| CN203465376U true CN203465376U (en) | 2014-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120241765.6U Expired - Lifetime CN203465376U (en) | 2011-07-11 | 2011-07-11 | Electric power-used adaptive frequency-selection impedance partial discharge detector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926461A (en) * | 2014-04-03 | 2014-07-16 | 北京锐质科控电气有限公司 | Frequency selection method for partial discharge signal spatial orientation receiving frequency |
| CN104062570A (en) * | 2014-07-14 | 2014-09-24 | 国家电网公司 | Power transformer partial discharge signal frequency-selecting method |
| CN104111375A (en) * | 2014-07-07 | 2014-10-22 | 国家电网公司 | Frequency selection method of receiving frequency of in-air device insulating internal discharge detection system |
| CN113945817A (en) * | 2020-07-16 | 2022-01-18 | 宝山钢铁股份有限公司 | Frequency band adaptive filtering method and device for partial discharge detection |
-
2011
- 2011-07-11 CN CN201120241765.6U patent/CN203465376U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926461A (en) * | 2014-04-03 | 2014-07-16 | 北京锐质科控电气有限公司 | Frequency selection method for partial discharge signal spatial orientation receiving frequency |
| CN104111375A (en) * | 2014-07-07 | 2014-10-22 | 国家电网公司 | Frequency selection method of receiving frequency of in-air device insulating internal discharge detection system |
| CN104062570A (en) * | 2014-07-14 | 2014-09-24 | 国家电网公司 | Power transformer partial discharge signal frequency-selecting method |
| CN113945817A (en) * | 2020-07-16 | 2022-01-18 | 宝山钢铁股份有限公司 | Frequency band adaptive filtering method and device for partial discharge detection |
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Granted publication date: 20140305 |