CN202886537U - Double-electrode-based detection device for transformer oil point discharge under impulse voltage - Google Patents
Double-electrode-based detection device for transformer oil point discharge under impulse voltage Download PDFInfo
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- CN202886537U CN202886537U CN 201220536097 CN201220536097U CN202886537U CN 202886537 U CN202886537 U CN 202886537U CN 201220536097 CN201220536097 CN 201220536097 CN 201220536097 U CN201220536097 U CN 201220536097U CN 202886537 U CN202886537 U CN 202886537U
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- 238000005259 measurement Methods 0.000 claims description 9
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Abstract
The utility model relates to a double-electrode-based detection device for transformer oil point discharge under an impulse voltage. The detection device is characterized by comprising an impulse voltage generator (1); an output end of the impulse voltage generator (1) is connected with the ground through a capacitive voltage divider (2) connected in series and is also connected with a point electrode (3) and a slightly non-uniform field electrode (4); the point electrode (3) and the slightly non-uniform field electrode (4) are respectively immersed in transformer oil in two containers, and bottoms of the two containers are respectively connected with the ground via ground wires; a current sensor (5) is sleeved on each ground wire; and an output end of each current sensor (5) is connected with an input end of an oscilloscope (8) via a series-connected high pass filter (7), and the other input end of the oscilloscope (8) is connected with the above capacitive voltage divider (2). The detection device of the utility model is capable of accurately measuring transformer oil point discharge under the impulse voltage.
Description
Technical field
The utility model relates to a kind of pick-up unit based on point discharge in the transformer oil under the surge voltage of bipolar electrode.
Background technology
Power transformer is one of visual plant in the electrical network, and its safe operation is concerning the safety of whole electrical network.Inner at transformer, metal tip is one of common defective, and metal tip can cause that electric field is concentrated, and then the generation of guiding discharge.Transformer except standing power-frequency voltage, also can suffer lightning impulse and operating impulse voltage in just capable operational process.Lightning impulse voltage is that isolating switch action etc. then can produce operating impulse voltage because the nature thunderstorm weather causes.The characteristics of lightning impulse and switching impulse are that waveform rises rapidly, then descend gradually, and it is high that it has a voltage magnitude, the characteristics that action time is short.The flash-over characteristic of metal tip discharge under power frequency carried out more research, but along with the in recent years development of extra-high voltage grid, switching impulse has become transformer insulated determinative, and under the surge voltage in the transformer oil research of point discharge characteristic also less, particularly surge voltage itself also is a transient signal, point discharge also is a transient signal, how to extract the transient state discharge signal under the excitation transient voltage, is exactly the problem that needs solve.
Therefore, the detection of point discharge in the transformer oil is studied the inhibition method of its interference under the research surge voltage, is accurately to obtain under the surge voltage basis of point discharge characteristic in the transformer oil.
The utility model content
The purpose of this utility model provides a kind of pick-up unit based on point discharge in the transformer oil under the surge voltage of bipolar electrode, can carry out Measurement accuracy under the surge voltage to point discharge in the transformer oil.
A kind of pick-up unit based on point discharge in the transformer oil under the surge voltage of bipolar electrode, its special feature is: comprise impulse voltage generator, the output terminal of this impulse voltage generator is in the capacitive divider ground connection by series connection, also with point electrode be connected the nonuniform field electrode and be connected, this point electrode and slightly the nonuniform field electrode be immersed in respectively in two transformer oil in the container, and ground connection is passed through respectively in the bottom of these two containers; On each ground wire, all be set with current sensor and the output terminal of the current sensor Hi-pass filter by series connection connects an oscillographic input end, and this oscillographic another input end links to each other with aforementioned capacitive divider also.
Be that 50 ohm measurement cable is connected by wave impedance all between oscillograph and the capacitive divider wherein between current sensor and the Hi-pass filter.
Wherein the capacitive divider intrinsic standoff ratio is 1000: 1.
Wherein point electrode be connected the nonuniform field electrode and all be connected with the output terminal of impulse voltage generator by insulation cover plate, and the distance of point electrode and nonuniform field electrode distance earth terminal slightly is consistent; Wherein slightly the nonuniform field electrode adopts this base electrode of Kenneth Rogoff, thereby makes its sparking voltage be higher than point electrode.
Wherein current sensor adopts this lubber ring of Kenneth Rogoff, and it measures frequency band is 100kHz～30MHz.
Wherein Hi-pass filter is the binary channels Hi-pass filter, and is limited to 3MHz under the frequency range.
Wherein in two containers, all be full of transformer oil fully, and point electrode and slightly the nonuniform field electrode all be immersed in the oil fully.
Through evidence, adopt pick-up unit of the present utility model to carry out Measurement accuracy under the surge voltage to point discharge in the transformer oil, and pick-up unit antijamming capability of the present utility model is strong, is suitable for point discharge mechanism, flash-over characteristic in the oil are carried out Measurement accuracy.
Description of drawings
Accompanying drawing 1 is structural representation of the present utility model.
Embodiment
As shown in Figure 1, the utility model is a kind of pick-up unit based on point discharge in the transformer oil under the surge voltage of bipolar electrode, comprise impulse voltage generator 1, the output terminal of this impulse voltage generator 1 is in capacitive divider 2 ground connection by series connection, also with point electrode 3 be connected nonuniform field electrode 4 and be connected, this point electrode 3 and slightly nonuniform field electrode 4 be immersed in respectively in two transformer oil in the container, and ground connection is passed through respectively in the bottom of these two containers; On each ground wire, all be set with current sensor 5, and the output terminal of current sensor 5 connects the input end of oscillograph 8 by the Hi-pass filter 7 of series connection, and another input end of this oscillograph 8 links to each other with aforementioned capacitive divider 2 also.
Be that 50 ohm measurement cable 6 is connected by wave impedance all between oscillograph 8 and the capacitive divider 2 wherein between current sensor 5 and the Hi-pass filter 7.Capacitive divider 2 intrinsic standoff ratios are 1000: 1.Point electrode 3 be connected nonuniform field electrode 4 and all be connected by the output terminal of insulation cover plate with impulse voltage generator 1, and point electrode 3 is with slightly nonuniform field electrode 4 is consistent apart from the distance of earth terminal (earth terminal of finger print type); Wherein slightly nonuniform field electrode 4 adopts this base electrode of Kenneth Rogoff, thereby makes its sparking voltage be higher than point electrode 3.
Wherein current sensor 5 adopts this lubber ring of Kenneth Rogoff, and it measures frequency band is 100kHz～30MHz.Hi-pass filter 7 is the binary channels Hi-pass filter, and frequency range lower limit 3MHz.
The utility model adopts impulse voltage generator 1 as the driving voltage of equipment, and this generator can produce lightning impulse voltage and operating impulse voltage.The generator ceiling voltage is 1800kV.Also adopt capacitive divider 2 to carry out the acquisition of excitation voltage waveform, capacitive divider 2 intrinsic standoff ratios are 1000: 1.
Test product adopts two kinds of electrode structures simultaneously, is respectively that slightly 4, two kinds of electrode external containers of nonuniform field electrode structure is the same in the point electrode 3 and transformer oil in the transformer oil, all links to each other with high-voltage power supply (impulse voltage generator 1) by insulation cover plate.Electrode distance earth terminal distance is consistent.Slightly nonuniform field electrode 4 adopts this base electrode of Kenneth Rogoff, so its sparking voltage is far above point electrode 3.
The discharge signal sensor adopts current sensor 5, and current sensor 5 adopts this lubber ring of Kenneth Rogoff, and it measures frequency band is 100kHz～30MHz, is socketed on the test product ground wire, is 50 ohm measurement cable 6 access Hi-pass filters 7 by wave impedance.
Hi-pass filter 7 is binary channels, and frequency range is lower limit 3MHz, but the displacement current that establishment impulse voltage generator 1 produces.
The local discharge signal access oscillograph 8 that the driving voltage signal that voltage divider obtains and this lubber ring of Kenneth Rogoff obtain gathers and analyzes, and oscillograph 8 adopts Tyke 4104, has four-way, 1G bandwidth, the 5GHz sampling rate.
Fig. 1 be in the utility model under the surge voltage measurement of partial discharge the application schematic diagram, wherein: impulse voltage generator 1 can produce lightning impulse and switching impulse, capacitive divider 2 is in parallel with impulse voltage generator 1, test product is in parallel with capacitive divider 2, two current sensors 5 are socketed in respectively on two test product electrode grounding lines, and the discharge signal that the voltage signal that voltage divider obtains, current sensor 5 obtain gathers and analyzes by Hi-pass filter 7 access oscillographs 8.To point electrode 3 and slightly nonuniform field electrode 4 apply simultaneously surge voltage and measurement, because slightly nonuniform field electrode 4 sparking voltages are far above point electrode 3, if therefore detecting both has identical discharge signal, then be driving source or outside undesired signal, slightly nonuniform field electrode 4 does not measure discharge signal if the current sensor 5 of point electrode 3 sockets measures discharge signal, discharge signal then is described from point electrode 3, and then can carries out the accurate detection of discharge signal.
In the actual tests, needs according to test, can adjust flexibly each competition, for example get: impulse voltage generator 1 parameter can be chosen according to the tested device rated voltage, the voltage divider no-load voltage ratio also can be chosen according to actual conditions, and metal tip length and tip curvature radius can be selected according to test situation.
Above partial discharge test system under the electrical equipment surge voltage provided by the utility model is described in detail, used specific case herein principle of the present utility model and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof; Simultaneously, for those skilled in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (7)
1. pick-up unit based on point discharge in the transformer oil under the surge voltage of bipolar electrode, it is characterized in that: comprise impulse voltage generator (1), the output terminal of this impulse voltage generator (1) is in capacitive divider (2) ground connection by series connection, also with point electrode (3) be connected nonuniform field electrode (4) and be connected, this point electrode (3) and slightly nonuniform field electrode (4) be immersed in respectively in two transformer oil in the container, and ground connection is passed through respectively in the bottom of these two containers; On each ground wire, all be set with current sensor (5), and the output terminal of current sensor (5) connects an input end of oscillograph (8) by the Hi-pass filter (7) of series connection, and another input end of this oscillograph (8) also links to each other with aforementioned capacitive divider (2).
2. a kind of pick-up unit based on point discharge in the transformer oil under the surge voltage of bipolar electrode as claimed in claim 1 is characterized in that: wherein between current sensor (5) and the Hi-pass filter (7), be that 50 ohm measurement cable (6) is connected by wave impedance all between oscillograph (8) and the capacitive divider (2).
3. a kind of pick-up unit based on point discharge in the transformer oil under the surge voltage of bipolar electrode as claimed in claim 1, it is characterized in that: wherein capacitive divider (2) intrinsic standoff ratio is 1000: 1.
4. a kind of pick-up unit based on point discharge in the transformer oil under the surge voltage of bipolar electrode as claimed in claim 1, it is characterized in that: wherein point electrode (3) be connected nonuniform field electrode (4) and all be connected by the output terminal of insulation cover plate with impulse voltage generator (1), and point electrode (3) is with slightly nonuniform field electrode (4) is consistent apart from the distance of earth terminal; Wherein slightly nonuniform field electrode (4) adopts this base electrode of Kenneth Rogoff, thereby makes its sparking voltage be higher than point electrode (3).
5. a kind of pick-up unit based on point discharge in the transformer oil under the surge voltage of bipolar electrode as claimed in claim 1 is characterized in that: wherein current sensor (5) adopts this lubber ring of Kenneth Rogoff, and it measures frequency band is 100kHz～30MHz.
6. a kind of pick-up unit based on point discharge in the transformer oil under the surge voltage of bipolar electrode as claimed in claim 1, it is characterized in that: wherein Hi-pass filter (7) is binary channels Hi-pass filter (7), and is limited to 3MHz under the frequency range.
7. such as the described a kind of pick-up unit based on point discharge in the transformer oil under the surge voltage of bipolar electrode of any one in the claim 1 to 6, it is characterized in that: wherein in two containers, all be full of transformer oil fully, and point electrode (3) and slightly nonuniform field electrode (4) all be immersed in the oil fully.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220536097 CN202886537U (en) | 2012-10-19 | 2012-10-19 | Double-electrode-based detection device for transformer oil point discharge under impulse voltage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220536097 CN202886537U (en) | 2012-10-19 | 2012-10-19 | Double-electrode-based detection device for transformer oil point discharge under impulse voltage |
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| Publication Number | Publication Date |
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| CN202886537U true CN202886537U (en) | 2013-04-17 |
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| CN 201220536097 Expired - Fee Related CN202886537U (en) | 2012-10-19 | 2012-10-19 | Double-electrode-based detection device for transformer oil point discharge under impulse voltage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914731A (en) * | 2012-10-19 | 2013-02-06 | 宁夏电力公司电力科学研究院 | Device for detecting point discharge in transformer oil under impulse voltage based on dual electrodes |
| CN105319470A (en) * | 2015-11-27 | 2016-02-10 | 国家电网公司 | System for distribution measurement testing of impulse voltage in transformer winding |
-
2012
- 2012-10-19 CN CN 201220536097 patent/CN202886537U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914731A (en) * | 2012-10-19 | 2013-02-06 | 宁夏电力公司电力科学研究院 | Device for detecting point discharge in transformer oil under impulse voltage based on dual electrodes |
| CN102914731B (en) * | 2012-10-19 | 2015-02-18 | 宁夏电力公司电力科学研究院 | Device for detecting point discharge in transformer oil under impulse voltage based on dual electrodes |
| CN105319470A (en) * | 2015-11-27 | 2016-02-10 | 国家电网公司 | System for distribution measurement testing of impulse voltage in transformer winding |
| CN105319470B (en) * | 2015-11-27 | 2017-05-10 | 国家电网公司 | System for distribution measurement testing of impulse voltage in transformer winding |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130417 Termination date: 20191019 |
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| CF01 | Termination of patent right due to non-payment of annual fee |