CN204214953U - For the dielectric spectroscopy measurement mechanism of bushing - Google Patents
For the dielectric spectroscopy measurement mechanism of bushing Download PDFInfo
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- CN204214953U CN204214953U CN201420687420.7U CN201420687420U CN204214953U CN 204214953 U CN204214953 U CN 204214953U CN 201420687420 U CN201420687420 U CN 201420687420U CN 204214953 U CN204214953 U CN 204214953U
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Abstract
The utility model relates to a kind of dielectric spectroscopy measurement mechanism for bushing, comprising: signal generation acquisition module, high pressure amplifying and Current amplifier module; Signal generation acquisition module comprises sweep signal output terminal, gathers voltage input end and Leakage Current input end; Sweep signal output terminal is connected with high pressure amplifying input end, and high pressure amplifying output terminal is connected with the high-pressure side of tested bushing on the one hand, on the other hand through divider resistance R1 and divider resistance R2 ground connection; Gathering voltage input end is connected between divider resistance R1 and divider resistance R2, and Leakage Current input end is connected with the end shield terminal of tested bushing through Current amplifier module.The utility model can measure collection voltage for calculating dielectric spectroscopy and Leakage Current, collection voltage and Leakage Current can be transferred to the host computer for calculating the dielectric loss angle gathered between voltage and Leakage Current, thus obtain the dielectric spectroscopy of tested bushing.
Description
[technical field]
The utility model relates to insulation of electrical installation detection technique field, particularly relates to a kind of dielectric spectroscopy measurement mechanism for bushing.
[background technology]
At present, China 111KV and above high-power transformer mainly adopt oil-immersed power transformer.Oil-immersed power transformer is core and the hinge of electric power transfer and distribution, and its stable operation has great importance for whole electric system.In the fault of oil-immersed power transformer, bushing insulation fault occupies larger proportion.As the important component part of oil-immersed power transformer, bushing plays a part to make high-low voltage leads insulation against ground and fixing high-low voltage leads.By the test of the bushing insulation characterisitic to oil-immersed power transformer, can the Hidden fault of Timeliness coverage bushing shell for transformer, avoid paroxysmal insulation fault occurs, the safe operation of electric system will be conducive to a great extent.
The research method adopted for transformer high-voltage bushing insulation condition diagnosis field both at home and abroad mainly comprises: return voltage method (RVM), polarization depolarization current method (PDC) and dielectric spectroscopy method (FDS) etc.RVM and PDC is the electric measurement based on time domain dielectric response theory.For RVM, very easily occasionally remember lax grade for polarization process owing to comprising a lot of boundary relaxations in dielectric response, so more difficult to the explanation of RVM measurement result, not easily diagnose the state of insulation of bushing.For PDC, when bushing abnormal aging (heat ageing or media ages etc.), detect the curve that bushing test result formed easily distort by using PDC, causing cannot the state of insulation of Accurate Diagnosis bushing.
FDS is a kind of electric measurement method based on frequency domain dielectric response, compare two kinds of methods above, FDS carry information enriches, little by noise jamming degree, required experimental power supply voltage is low, can overcome the defect of RVM and PDC, but FDS is mostly at the experimental stage at present, also be not applied to special measurement device or the instrument of the dielectric spectroscopy at oil-immersed power transformer scene at detection field at present, the popularization of FDS is restricted.
[utility model content]
Based on this, be necessary the problem not having dielectric spectroscopy special measurement device for detection field in prior art at present, a kind of dielectric spectroscopy measurement mechanism for bushing is provided.
For a dielectric spectroscopy measurement mechanism for bushing, comprising: signal generation acquisition module, high pressure amplifying and Current amplifier module;
Described signal generation acquisition module comprises sweep signal output terminal, gathers voltage input end and Leakage Current input end;
Described sweep signal output terminal is connected with high pressure amplifying input end, and described high pressure amplifying output terminal is connected with the high-pressure side of tested bushing on the one hand, on the other hand through divider resistance R1 and divider resistance R2 ground connection;
Described collection voltage input end is connected between divider resistance R1 and divider resistance R2, and described Leakage Current input end is connected with the end shield terminal of tested bushing through Current amplifier module.
The utility model signal sends the sweep signal that acquisition module can produce different frequency, sweep signal injects tested bushing after high pressure amplifying is amplified, the Leakage Current of tested bushing is gathered by the Leakage Current input end that signal sends acquisition module after Current amplifier module is amplified, then signal generation acquisition module obtains and gathers voltage and Leakage Current, collection voltage and Leakage Current can be transferred to the external host computer for calculating the dielectric loss angle gathered between voltage and Leakage Current by last signal transmission acquisition module, thus obtain the dielectric spectroscopy family curve of tested bushing.The utility model can at oil-immersed power transformer in-site measurement for calculating collection voltage and the Leakage Current of bushing dielectric spectroscopy, collection voltage and Leakage Current can be transferred to the host computer for calculating the dielectric loss angle gathered between voltage and Leakage Current, thus obtain the dielectric spectroscopy of tested bushing.
[accompanying drawing explanation]
Fig. 1 is the electrical block diagram of the utility model for a kind of embodiment of dielectric spectroscopy measurement mechanism of bushing;
Fig. 2 is the structural representation of the utility model for a kind of embodiment of dielectric spectroscopy measurement mechanism mesohigh amplification module of bushing;
Fig. 3 is the structural representation of the utility model for a kind of embodiment of Current amplifier module in the dielectric spectroscopy measurement mechanism of bushing.
[embodiment]
In order to make the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model is described in further detail.
Refer to Fig. 1, it is the electrical block diagram of utility model for a kind of embodiment of dielectric spectroscopy measurement mechanism of bushing.
For a dielectric spectroscopy measurement mechanism for bushing, comprising: signal generation acquisition module 20, high pressure amplifying 30 and Current amplifier module 40;
Described signal generation acquisition module 20 comprises sweep signal output terminal, gathers voltage input end and Leakage Current input end; In addition, signal sends acquisition module 20 and also comprises USB interface end, and described USB interface end is connected with host computer; The control that described signal generation acquisition module 20 can accept host computer sends sweep signal, the collection voltage being used for calculating dielectric spectroscopy collected and Leakage Current also can be transferred to host computer by USB data line by signal generation acquisition module 20, then calculate dielectric spectroscopy by host computer;
Preferably, described signal generation acquisition module 20 is based on the signal generation acquisition module of NI (National Instrument, National Semiconductor) USB-6211 capture card.NI USB-6211 capture card is bus-powered DAQ (the Data Acquisition of a Multifunctional USB, data acquisition) module, there is sampling precision high, maximumly can support 16 tunnel analog inputs, 2 road modulating output, sampling rate for each channel can reach 250kS/s.Therefore, described signal generation acquisition module 20 is maximum can comprise 1 collection voltage input end and 15 road Leakage Current input ends.Preferably, described signal generation acquisition module 20 comprises 10 road Leakage Current input ends, to alleviate the load pressure of described high voltage amplifier circuit.Described signal generation acquisition module 20 can carry out leakage voltage acquisition to 10 bushings simultaneously, and the test duration can significantly be saved.
Described sweep signal output terminal is connected with high pressure amplifying 30 input end, and described high pressure amplifying 30 output terminal is connected with the high-pressure side of tested bushing on the one hand, on the other hand through divider resistance R1 and divider resistance R2 ground connection;
Described collection voltage input end is connected between divider resistance R1 and divider resistance R2, and described Leakage Current input end is connected with the end shield terminal of tested bushing through Current amplifier module 40.
When signal generation acquisition module 20 external host computer, host computer can be held with the USB of signal generation acquisition module 20 by USB connecting line and be connected, PC control signal generation acquisition module sends the sweep signal of predeterminated frequency, and sweep signal acts on high voltage bushings after high pressure amplifying is amplified.Signal generation acquisition module collects leakage current size and the phase place of multiple bushing by collection voltage input end and Leakage Current input end, then host computer 10 is by the phase differential of the collection voltage under analytical calculation different frequency and Leakage Current, obtain that sheet of frequency domain ground connection of the transformer high-voltage bushing under different frequency, analyze the state of insulation of bushing with described dielectric spectroscopy.When described sweep signal is low frequency signal, described signal generation acquisition module 20 can carry out leakage voltage acquisition to 10 bushings simultaneously, and the test duration can significantly be saved.When sweep signal is high-frequency signal, only to carrying out single channel loop test, that is only a tested bushing is tested, to reduce the sample frequency requirement to signal generation sampling module 20 in the time period.
The utility model signal sends the sweep signal that acquisition module can produce different frequency, sweep signal injects tested bushing after high pressure amplifying is amplified, the Leakage Current of tested bushing is gathered by the Leakage Current input end that signal sends acquisition module after Current amplifier module is amplified, then signal generation acquisition module obtains and gathers voltage and Leakage Current, collection voltage and Leakage Current can be transferred to the host computer for calculating the dielectric loss angle gathered between voltage and Leakage Current by last signal transmission acquisition module, thus obtain the dielectric spectroscopy family curve of tested bushing.The utility model can at oil-immersed power transformer in-site measurement for calculating collection voltage and the Leakage Current of bushing dielectric spectroscopy, collection voltage and Leakage Current can be transferred to the host computer for calculating the dielectric loss angle gathered between voltage and Leakage Current, thus obtain the dielectric spectroscopy of tested bushing.
Refer to Fig. 2, it is the structural representation of the utility model for a kind of embodiment of dielectric spectroscopy measurement mechanism mesohigh amplification module of bushing.
In a preferred embodiment, above-mentioned high pressure amplifying 30 can comprise: high-voltage amplifier 301, fuse 302 and current-limiting resistance 303;
Wherein, the sweep signal output terminal that described high-voltage amplifier 301 input end and described signal send acquisition module is connected, described high-voltage amplifier output terminal is connected with the high-pressure side of tested bushing on the one hand through current-limiting resistance, on the other hand through divider resistance R1 and divider resistance R2 ground connection; Described fuse two ends are connected with high-voltage amplifier output terminal and current-limiting resistance respectively.
High-voltage amplifier 301 preferably model is that PA15FL, PA15FL sparking voltage reaches as high as 450V, and its maximum output current can reach 200mA.
Amplified by the voltage of high-voltage amplifier 301 pairs of sweep signals; make to export tested bushing to enough large; ensure that the Leakage Current of tested bushing can be detected reception; in addition; prevent the electric current flowing through high-voltage amplifier 301 excessive by fuse 302 and current-limiting resistance 303; high-voltage amplifier 301 is avoided to burn out because electric current is excessive, thus the serviceable life of protection high-voltage amplifier 301.
Refer to Fig. 3, it is the structural representation of the utility model for a kind of embodiment of Current amplifier module in the dielectric spectroscopy measurement mechanism of bushing.
In a preferred embodiment, above-mentioned Current amplifier module comprises: operational amplifier 401 and amplification resistance R
f;
The positive input ground connection of described operational amplifier 401, reverse input end is connected with the end shield terminal of quilt cover bushing, described amplification resistance R
fone end is connected with the reverse input end of operational amplifier 401, and the other end is connected with the output terminal of operational amplifier 401.
The Leakage Current theoretical value of tested bushing between 500pA-0.5mA, when profound and negative feedbck, operational amplifier 401 output voltage E
out≈-I
inr
f, wherein, I
infor Leakage Current, R
ffor amplifying the resistance of resistance, that is Leakage Current is zoomed into the leakage voltage being applicable to gathering and outputs to signal generation acquisition module by Current amplifier module 40.Preferably, described operational amplifier 401 is AD712 operational amplifier.AD712 operational amplifier is a binary channels, precision, low cost, high speed operation amplifier, and Open loop gain cofficient is 400V/mV, unity gain bandwidth 3MHz, offset voltage 0.3mV.Have Open loop gain cofficient large, unity gain bandwidth is large and lose the little feature of voltage, and waveform and phase place can be undistorted after amplifying can to ensure Leakage Current.
By operational amplifier 401, Leakage Current is zoomed into the leakage voltage being applicable to gathering and output to signal generation acquisition module, the collection difficulty of Leakage Current can be reduced, the problem causing generation current phase error when gathering Leakage Current by resistance in series can be avoided.
The above embodiment only have expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (6)
1. for a dielectric spectroscopy measurement mechanism for bushing, it is characterized in that, comprising: signal generation acquisition module, high pressure amplifying and Current amplifier module;
Described signal generation acquisition module comprises sweep signal output terminal, gathers voltage input end and Leakage Current input end;
Described sweep signal output terminal is connected with high pressure amplifying input end, and described high pressure amplifying output terminal is connected with the high-pressure side of tested bushing on the one hand, on the other hand through divider resistance R1 and divider resistance R2 ground connection;
Described collection voltage input end is connected between divider resistance R1 and divider resistance R2, and described Leakage Current input end is connected with the end shield terminal of tested bushing through Current amplifier module.
2. the dielectric spectroscopy measurement mechanism for bushing according to claim 1, it is characterized in that, described high pressure amplifying comprises: high-voltage amplifier and current-limiting resistance, the sweep signal output terminal that wherein said high-voltage amplifier input end and described signal send acquisition module is connected, described high-voltage amplifier output terminal is connected with the high-pressure side of tested bushing on the one hand through current-limiting resistance, on the other hand through divider resistance R1 and divider resistance R2 ground connection.
3. the dielectric spectroscopy measurement mechanism for bushing according to claim 2, it is characterized in that, described high pressure amplifying also comprises: fuse, and described fuse two ends are connected with high-voltage amplifier output terminal and current-limiting resistance respectively.
4. the dielectric spectroscopy measurement mechanism for bushing according to claim 1, it is characterized in that, described Current amplifier module comprises: operational amplifier and amplification resistance, the positive input ground connection of described operational amplifier, reverse input end is connected with the end shield terminal of quilt cover bushing, described amplification resistance one end is connected with the reverse input end of operational amplifier, and the other end is connected with the output terminal of operational amplifier.
5. the dielectric spectroscopy measurement mechanism for bushing according to claim 1, is characterized in that, described operational amplifier is AD712 operational amplifier.
6. the dielectric spectroscopy measurement mechanism for bushing according to claim 1, is characterized in that, described signal generation acquisition module is the signal generation acquisition module based on NIUSB-6211 capture card.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420687420.7U CN204214953U (en) | 2014-11-17 | 2014-11-17 | For the dielectric spectroscopy measurement mechanism of bushing |
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| CN201420687420.7U CN204214953U (en) | 2014-11-17 | 2014-11-17 | For the dielectric spectroscopy measurement mechanism of bushing |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407230A (en) * | 2014-11-17 | 2015-03-11 | 广州供电局有限公司 | Frequency domain dielectric spectrum measuring device for high voltage bushing |
| CN107621597A (en) * | 2017-09-11 | 2018-01-23 | 哈尔滨理工大学 | A kind of cable semi-conductive shield material AC/DC dielectric properties test system and method |
| CN112180175A (en) * | 2020-10-10 | 2021-01-05 | 重庆交通大学 | Ship cable insulation corrosion degree assessment method based on multidimensional relaxation parameters |
| CN114167184A (en) * | 2021-12-06 | 2022-03-11 | 国网新疆电力有限公司电力科学研究院 | Sleeve and mutual inductor end screen online monitoring networking system and method based on Internet of things |
-
2014
- 2014-11-17 CN CN201420687420.7U patent/CN204214953U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407230A (en) * | 2014-11-17 | 2015-03-11 | 广州供电局有限公司 | Frequency domain dielectric spectrum measuring device for high voltage bushing |
| CN104407230B (en) * | 2014-11-17 | 2016-08-17 | 广州供电局有限公司 | Dielectric spectroscopy measurement apparatus for bushing |
| CN107621597A (en) * | 2017-09-11 | 2018-01-23 | 哈尔滨理工大学 | A kind of cable semi-conductive shield material AC/DC dielectric properties test system and method |
| CN112180175A (en) * | 2020-10-10 | 2021-01-05 | 重庆交通大学 | Ship cable insulation corrosion degree assessment method based on multidimensional relaxation parameters |
| CN114167184A (en) * | 2021-12-06 | 2022-03-11 | 国网新疆电力有限公司电力科学研究院 | Sleeve and mutual inductor end screen online monitoring networking system and method based on Internet of things |
| CN114167184B (en) * | 2021-12-06 | 2024-01-23 | 国网新疆电力有限公司电力科学研究院 | Sleeve and transformer end screen online monitoring networking system and method based on Internet of things |
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