CN204666729U - A kind of capacitive apparatus medium loss measuring device with electricity - Google Patents
A kind of capacitive apparatus medium loss measuring device with electricity Download PDFInfo
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- CN204666729U CN204666729U CN201520341950.0U CN201520341950U CN204666729U CN 204666729 U CN204666729 U CN 204666729U CN 201520341950 U CN201520341950 U CN 201520341950U CN 204666729 U CN204666729 U CN 204666729U
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Abstract
The utility model discloses a kind of capacitive apparatus medium loss measuring device with electricity, comprise CT current transformer, PT voltage transformer (VT), current-differencing amplifying circuit, voltage differential amplifier circuit, first low-pass filter circuit, second low-pass filter circuit, first programmable amplifying circuit, second programmable amplifying circuit, first sampling hold circuit, second sampling hold circuit, first A/D convertor circuit, second A/D convertor circuit, FPGA, GPRS telecommunication circuit and remote terminal, FPGA is adopted to be the Fourier transform that microprocessor carries out voltage and current signal, to carry out dielectric loss calculating, cost is lower, circuit design is convenient, and add the differential amplifier circuit eliminating common mode interference, increase measuring accuracy, FPGA also carries out wireless data communications by GPRS telecommunication circuit and remote terminal, without the need to wiring, strong interference immunity in data transmission procedure, have a good application prospect.
Description
Technical field
The utility model belongs to capacitive apparatus detection technique field, is specifically related to a kind of capacitive apparatus medium loss measuring device with electricity.
Background technology
The capacitive apparatus of Intelligent transformer station, main finger sleeve, lightning rod, coupling condenser etc., the quantity of capacitive apparatus accounts for 40% ~ 50%, and the insulating property loss of himself is the important technology index being related to the operation of capacitive apparatus site safety.The insulation degradation of capacitive apparatus is the process of a gradual change, if can not Timeliness coverage overhauling, just may cause device fails and then cause catastrophic discontinuityfailure, causing huge direct, indirect economic loss.At present, capacitive apparatus medium loss pick-up unit on the market, the wired detection of many employings, be not easy to field wiring, and, be subject to on-the-spot electromagnetic interference (EMI), easily affect image data Signal transmissions, existing voltage, circuit collection all adopt common amplifier to carry out signal amplification, there will be distortion phenomenon, affect the dielectric loss computational accuracy in follow-up microprocessor, and, traditional microprocessor is the platform of dsp processor+arm processor, and cost is higher, complex circuit designs.
Utility model content
The technical matters that the utility model solves is the capacitive apparatus medium loss pick-up unit overcome on the market, adopt wired detection, be not easy to field wiring, easily be subject to on-the-spot electromagnetic interference influence image data Signal transmissions, and, adopt common amplifier to carry out signal amplification, there will be distortion phenomenon, affect the dielectric loss computational accuracy in follow-up microprocessor, and the microprocessor cost selected is higher, the problem of complex circuit designs.
In order to solve the problems of the technologies described above, the technical scheme that the utility model adopts is:
A kind of capacitive apparatus medium loss measuring device with electricity, comprises CT current transformer, PT voltage transformer (VT), current-differencing amplifying circuit, voltage differential amplifier circuit, first low-pass filter circuit, second low-pass filter circuit, first programmable amplifying circuit, second programmable amplifying circuit, first sampling hold circuit, second sampling hold circuit, first A/D convertor circuit, second A/D convertor circuit, FPGA, GPRS telecommunication circuit and remote terminal, described CT current transformer, PT voltage transformer (VT) is arranged on capacitive apparatus respectively, and the output terminal of described CT current transformer is connected with current-differencing amplifying circuit in turn, first low-pass filter circuit, first programmable amplifying circuit, first sampling hold circuit, first A/D convertor circuit is connected with the current signal output end of FPGA, and the output terminal of described PT voltage transformer (VT) is connected with voltage differential amplifier circuit in turn, second low-pass filter circuit, second programmable amplifying circuit, second sampling hold circuit, second A/D convertor circuit is connected with the voltage signal output end of FPGA, and described FPGA also carries out wireless data communications by GPRS telecommunication circuit and remote terminal.
Aforesaid a kind of capacitive apparatus medium loss measuring device with electricity, is characterized in that: described FPGA is also connected with LCDs.
Aforesaid a kind of capacitive apparatus medium loss measuring device with electricity, is characterized in that: described CT current transformer is the pincerlike current sensor of open type being provided with shielding processing, and described PT voltage transformer (VT) is CHCS-PT107 voltage transformer (VT).
Aforesaid a kind of capacitive apparatus medium loss measuring device with electricity, is characterized in that: described first A/D convertor circuit, the second A/D convertor circuit are equipped with 24 modulus conversion chip AD7713.
The beneficial effects of the utility model are: the capacitive apparatus medium loss measuring device with electricity that the utility model provides, FPGA is adopted to be the Fourier transform that microprocessor carries out voltage and current signal, to carry out dielectric loss calculating, cost is lower, circuit design is convenient, and add the differential amplifier circuit eliminating common mode interference, increase measuring accuracy, FPGA also carries out wireless data communications by GPRS telecommunication circuit and remote terminal, without the need to wiring, strong interference immunity in data transmission procedure, has a good application prospect.
Accompanying drawing explanation
Fig. 1 is the system chart of capacitive apparatus medium loss measuring device with electricity of the present utility model.
Embodiment
Below in conjunction with Figure of description, the utility model is further described.
As shown in Figure 1, a kind of capacitive apparatus medium loss measuring device with electricity, comprises CT current transformer, PT voltage transformer (VT), current-differencing amplifying circuit, voltage differential amplifier circuit, first low-pass filter circuit, second low-pass filter circuit, first programmable amplifying circuit, second programmable amplifying circuit, first sampling hold circuit, second sampling hold circuit, first A/D convertor circuit, second A/D convertor circuit, FPGA, GPRS telecommunication circuit and remote terminal, described CT current transformer, PT voltage transformer (VT) is arranged on capacitive apparatus respectively, and the output terminal of described CT current transformer is connected with current-differencing amplifying circuit in turn, first low-pass filter circuit, first programmable amplifying circuit, first sampling hold circuit, first A/D convertor circuit is connected with the current signal output end of FPGA, and the output terminal of described PT voltage transformer (VT) is connected with voltage differential amplifier circuit in turn, second low-pass filter circuit, second programmable amplifying circuit, second sampling hold circuit, second A/D convertor circuit is connected with the voltage signal output end of FPGA, and described FPGA also carries out wireless data communications by GPRS telecommunication circuit and remote terminal, without the need to wiring, and possesses the effect of strong interference immunity in data transmission procedure.
Described FPGA is also connected with LCDs, for showing the electric current of collection, voltage signal and by the dielectric loss result of calculation after Fourier transform process at the scene.
Described CT current transformer is the pincerlike current sensor of open type being provided with shielding processing, and described PT voltage transformer (VT) is CHCS-PT107 voltage transformer (VT), and both volumes are little, is convenient to install, and interference free performance is high.
Described first A/D convertor circuit, the second A/D convertor circuit are equipped with 24 modulus conversion chip AD7713, and conversion accuracy is high, provide the degree of accuracy that dielectric loss calculates.
Capacitive apparatus medium loss measuring device with electricity of the present utility model, by current signal, voltage signal that CT current transformer, PT voltage transformer (VT) gather, carry out the differential amplification of elimination common mode interference, low-pass filtering, programming amplifying, sampling maintenance, AD conversion respectively, sampling is by FPGA process, by the separately process of current signal, voltage signal, prevent signal disturbing between the two, accuracy of detection can be improved further.
More than show and describe ultimate principle of the present utility model, principal character and advantage.The technician of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (4)
1. a capacitive apparatus medium loss measuring device with electricity, comprises CT current transformer, PT voltage transformer (VT), current-differencing amplifying circuit, voltage differential amplifier circuit, first low-pass filter circuit, second low-pass filter circuit, first programmable amplifying circuit, second programmable amplifying circuit, first sampling hold circuit, second sampling hold circuit, first A/D convertor circuit, second A/D convertor circuit, FPGA, GPRS telecommunication circuit and remote terminal, described CT current transformer, PT voltage transformer (VT) is arranged on capacitive apparatus respectively, and the output terminal of described CT current transformer is connected with current-differencing amplifying circuit in turn, first low-pass filter circuit, first programmable amplifying circuit, first sampling hold circuit, first A/D convertor circuit is connected with the current signal output end of FPGA, and the output terminal of described PT voltage transformer (VT) is connected with voltage differential amplifier circuit in turn, second low-pass filter circuit, second programmable amplifying circuit, second sampling hold circuit, second A/D convertor circuit is connected with the voltage signal output end of FPGA, and described FPGA also carries out wireless data communications by GPRS telecommunication circuit and remote terminal.
2. a kind of capacitive apparatus medium loss measuring device with electricity according to claim 1, is characterized in that: described FPGA is also connected with LCDs.
3. a kind of capacitive apparatus medium loss measuring device with electricity according to claim 1, is characterized in that: described CT current transformer is the pincerlike current sensor of open type being provided with shielding processing, and described PT voltage transformer (VT) is CHCS-PT107 voltage transformer (VT).
4. a kind of capacitive apparatus medium loss measuring device with electricity according to claim 1, is characterized in that: described first A/D convertor circuit, the second A/D convertor circuit are equipped with 24 modulus conversion chip AD7713.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520341950.0U CN204666729U (en) | 2015-05-25 | 2015-05-25 | A kind of capacitive apparatus medium loss measuring device with electricity |
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| CN201520341950.0U CN204666729U (en) | 2015-05-25 | 2015-05-25 | A kind of capacitive apparatus medium loss measuring device with electricity |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093543A (en) * | 2016-06-07 | 2016-11-09 | 国网电力科学研究院武汉南瑞有限责任公司 | Direct current cables leakage current electrification detection system |
| CN106291120A (en) * | 2015-05-25 | 2017-01-04 | 国家电网公司 | A kind of capacitive apparatus medium loss measuring device with electricity |
| CN106405411A (en) * | 2016-11-23 | 2017-02-15 | 国家电网公司 | Digital integration method breaker dielectric loss angle tangent value online monitoring system and method thereof |
| CN108539826A (en) * | 2018-05-14 | 2018-09-14 | 东莞市迈纳斯航空技术有限公司 | A kind of system and method for enhancing handheld multimedia devices lithium battery service life |
-
2015
- 2015-05-25 CN CN201520341950.0U patent/CN204666729U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291120A (en) * | 2015-05-25 | 2017-01-04 | 国家电网公司 | A kind of capacitive apparatus medium loss measuring device with electricity |
| CN106093543A (en) * | 2016-06-07 | 2016-11-09 | 国网电力科学研究院武汉南瑞有限责任公司 | Direct current cables leakage current electrification detection system |
| CN106405411A (en) * | 2016-11-23 | 2017-02-15 | 国家电网公司 | Digital integration method breaker dielectric loss angle tangent value online monitoring system and method thereof |
| CN106405411B (en) * | 2016-11-23 | 2023-09-22 | 国家电网公司 | Digital integration method breaker dielectric loss tangent value on-line monitoring system and method |
| CN108539826A (en) * | 2018-05-14 | 2018-09-14 | 东莞市迈纳斯航空技术有限公司 | A kind of system and method for enhancing handheld multimedia devices lithium battery service life |
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