CN202870242U - A voltage-equalizing device used for partial discharge test of a converter transformer - Google Patents
A voltage-equalizing device used for partial discharge test of a converter transformer Download PDFInfo
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- CN202870242U CN202870242U CN 201220461682 CN201220461682U CN202870242U CN 202870242 U CN202870242 U CN 202870242U CN 201220461682 CN201220461682 CN 201220461682 CN 201220461682 U CN201220461682 U CN 201220461682U CN 202870242 U CN202870242 U CN 202870242U
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- discharge test
- installing sleeve
- equalizing device
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- 238000012360 testing method Methods 0.000 title claims abstract description 24
- 238000009434 installation Methods 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 description 7
- 230000005684 electric field Effects 0.000 description 5
- 238000004804 winding Methods 0.000 description 4
- 101100129500 Caenorhabditis elegans max-2 gene Proteins 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
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- 238000004458 analytical method Methods 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000005686 electrostatic field Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004643 material aging Methods 0.000 description 1
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Abstract
The utility model provides a voltage-equalizing device used for partial discharge test of a converter transformer. The voltage-equalizing device comprises an upper voltage-equalizing ring, a lower voltage-equalizing ring, and an installing sleeve which are arranged coaxially. The installing sleeve is arranged between the upper voltage-equalizing ring and the lower voltage-equalizing ring. A plurality of supporting bars are disposed between the upper voltage-equalizing ring and the installing sleeve while a plurality of supporting bars are disposed between the lower voltage-equalizing ring and the installing sleeve. With a simple structure and easy installation, the voltage-equalizing device used for partial discharge test of a converter transformer is capable of effectively preventing or reducing interference from corona discharge to a partial discharge signal and increasing accuracy of the partial discharge test of the converter transformer.
Description
[technical field]
The utility model relates to the power technology field, particularly a kind of converter power transformer partial discharge test pressure-equalizing device.
[background technology]
Qinghai-Tibet ± 400kV DC networking project will put into operation the end of the year 2011, be the largest power transmission engineering of high height above sea level, construction in high-cold region in the world up to now.It can not only satisfy recycling economy test site, Qaidam, Qinghai need for electricity, service Qinghai socio-economic development, priorly will fundamentally solve Tibet region short of electricity and the poor problem of grid stability, be prosperity, harmony, the stable outstanding contributions of making of border areas economic society.
Insulation system mainly is paper oil insulation in the converter power transformer, and the shelf depreciation of transformer under operating voltage is the key factor that paper oil insulation is worn out and develop into puncture.Shelf depreciation in the paper oil insulation begins to occur from the burr of wherein bubble, impurity, conductive surface and oil clearance etc. often.Cause the factor of transformer insulated middle generation bubble to mainly contain: one, the defective on transformer insulation structure and the manufacturing process, as in the transformer solid structure, being not good at and residual bubble owing to flooding, or internal field is too high, oil bubbing under high electric field action, local overheating decompose solid and liquid and produce gas etc.; Two, transformer insulating material aging, deteriorated in long-term operational process, such as humidified insulation, moisture wherein is vaporized into bubble at heat spot, or moisture electrolysis under high electric field action produces bubble.This shows, shelf depreciation is transformer insulated deteriorated sign, is again transformer insulated deteriorated reason, measures shelf depreciation and can effectively find the inherent shortcoming of transformer built-in electrical insulation and the local hidden danger that insulation ag(e)ing is produced because of long-time running.Therefore, partial discharge test is in time to find the important means of transformer latent fault.
The converter power transformer local discharge signal is generally less, usually is submerged among the various undesired signals, the Measurement accuracy local discharge signal, must be with various ELIMINATION OF ITS INTERFERENCE outside.Qaidam converter power transformer net side 330kV sleeve pipe, valve side star shaped casing tube head end, valve side angle shape sleeve pipe head end are added the current conversion station height above sea level because voltage is higher, rarefaction of air, and the unit length air gap more easily discharges.
[utility model content]
The purpose of this utility model provides a kind of converter power transformer partial discharge test pressure-equalizing device, with the interference of Avoids or reduces corona discharge to local discharge signal, increases the accuracy of converter power transformer partial discharge test.
To achieve these goals, the utility model adopts following technical scheme:
A kind of converter power transformer partial discharge test pressure-equalizing device comprises grading ring, lower uniform pressure ring and installing sleeve; The coaxial setting of upper grading ring, lower uniform pressure ring and installing sleeve, installing sleeve are arranged between grading ring and the lower uniform pressure ring; Be provided with some support bars between upper grading ring and the installing sleeve, be provided with some support bars between lower uniform pressure ring and the installing sleeve.
The utility model further improves and is: the external diameter of upper grading ring and lower uniform pressure ring is identical with diameter of section.
The utility model further improves and is: the external diameter of upper grading ring and lower uniform pressure ring is greater than the external diameter of installing sleeve.
The utility model further improves and is: the external diameter of installing sleeve is 45cm, highly is 10cm.
The utility model further improves and is: evenly be provided with three support bars between upper grading ring and the installing sleeve.
The utility model further improves and is: evenly be provided with three support bars between lower uniform pressure ring and the installing sleeve.
The utility model further improves and is: the external diameter of upper grading ring and lower uniform pressure ring is 140cm, and diameter of section is 30cm; Distance between the end face of upper grading ring and the bottom surface of lower uniform pressure ring is 100cm.
The utility model further improves and is: the external diameter of upper grading ring and lower uniform pressure ring is 110cm, and diameter of section is 20cm; Distance between the end face of upper grading ring and the bottom surface of lower uniform pressure ring is 85cm.
Compared with prior art, the utlity model has following advantage: a kind of converter power transformer partial discharge test of the utility model pressure-equalizing device, simple in structure, easy for installation, effectively the Avoids or reduces corona discharge increases the accuracy of converter power transformer partial discharge test to the interference of local discharge signal.
[description of drawings]
Fig. 1 is structural representation of the present utility model.
[embodiment]
Below in conjunction with accompanying drawing the utility model is done and to be described in further detail.
See also shown in Figure 1ly, a kind of converter power transformer partial discharge test of the utility model pressure-equalizing device comprises grading ring 1, lower uniform pressure ring 2, installing sleeve 3 and support bar 4; Upper grading ring 1, lower uniform pressure ring 2 and installing sleeve 3 coaxial settings, installing sleeve 3 is arranged between grading ring 1 and the lower uniform pressure ring 2; 3 ends in 6 support bars 4 connect the lower ends of upper grading rings, the upper end of other end connection sleeve 3; The lower end of other 3 support bar 4 one end connection sleeves 3, the other end connects the upper end of lower uniform pressure ring 2.During use, a kind of converter power transformer partial discharge test of the utility model can be installed on converter power transformer net side 330kV sleeve pipe, valve side star winding head end or the valve side angle shape winding head end with pressure-equalizing device by installing sleeve 3, it all presses better effects if with respect to single strap, is more suitable in the high altitude localities.The external diameter of upper grading ring 1 and lower uniform pressure ring 2 is identical with diameter of section, and the external diameter of upper grading ring 1 and lower uniform pressure ring 2 is greater than the external diameter of installing sleeve 3; The external diameter of installing sleeve 3 is 45cm, highly is 10cm.
According to electrostatic field analysis, can calculate maximum field strength on the grading ring by the experimental formula of corona inception field strength.
Applied voltage U and E
MaxBetween the pass be:
In the formula, d is interelectrode distance, and f is the electric field nonuniformity coefficient.
Calculate the grading ring maximum field strength during test and adopt ball---Slab.Known grading ring is 6m apart from framework plan range d, and then this model geometric characteristic coefficient is:
p1=（r+d)/r=(0.8+6)/0.8=8.5；
p2=（r+d)/r=(0.5+6)/0.5=13。
At this moment table look-up to get that the electric field nonuniformity coefficient is f1=7.8, f2=10.6.Trial voltage be 356.3kV(because valve side angle shape voltage is 297.7kV, therefore only be lower than voltage on line side, need to adjust net side bloom field intensity), can get:
E
max2=171.9×10.6/600=3.0kV/㎝
Qaidam current conversion station height above sea level is about 2800m, and air relative density δ is 0.709, can get E after the height above sea level correction
Max1=4.68/0.709=6.6kV/cm, E
Max2=3.0/0.709=4.2kV/cm.
The utility model comprises the first pressure-equalizing device and the second pressure-equalizing device; The external diameter of the first pressure-equalizing device is 140cm, and diameter of section is 30cm; The external diameter of the second pressure-equalizing device is 110cm, and diameter of section is 20cm.The first pressure-equalizing device is used for converter power transformer net side 330kV sleeve pipe, valve side star winding head end, and the second pressure-equalizing device is used for valve side angle shape winding head end.The overall height of the first pressure-equalizing device is 100cm, and the overall height of the second pressure-equalizing device is 85cm; Through simulation calculation, the own bloom electric field intensity of the first pressure-equalizing device and the second pressure-equalizing device is respectively E1=10kV/cm, and E2=8kV/cm satisfies E1＞E
Max1, E2＞E
Max2
Although the above is described the utility model by reference to the accompanying drawings; but the utility model is not limited to above-mentioned embodiment; above-mentioned embodiment only is schematic; rather than restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; not breaking away from the scope situation that the utility model aim and claim protect, can also make a lot of forms, these all belong within the protection of the present utility model.
Claims (8)
1. a converter power transformer partial discharge test pressure-equalizing device is characterized in that, comprises grading ring (1), lower uniform pressure ring (2) and installing sleeve (3); Upper grading ring (1), lower uniform pressure ring (2) and the coaxial setting of installing sleeve (3), installing sleeve (3) are arranged between grading ring (1) and the lower uniform pressure ring (2); Be provided with some support bars (4) between upper grading ring (1) and the installing sleeve (3), be provided with some support bars (4) between lower uniform pressure ring (2) and the installing sleeve (3).
2. a kind of converter power transformer partial discharge test pressure-equalizing device according to claim 1 is characterized in that, upper grading ring (1) is identical with diameter of section with the external diameter of lower uniform pressure ring (2).
3. a kind of converter power transformer partial discharge test pressure-equalizing device according to claim 1 is characterized in that, the external diameter of upper grading ring (1) and lower uniform pressure ring (2) is greater than the external diameter of installing sleeve (3).
4. a kind of converter power transformer partial discharge test pressure-equalizing device according to claim 1 is characterized in that, the external diameter of installing sleeve (3) is 45cm, highly is 10cm.
5. a kind of converter power transformer partial discharge test pressure-equalizing device according to claim 1 is characterized in that, evenly is provided with three support bars (4) between upper grading ring (1) and the installing sleeve (3).
6. a kind of converter power transformer partial discharge test pressure-equalizing device according to claim 1 is characterized in that, evenly is provided with three support bars (4) between lower uniform pressure ring (2) and the installing sleeve (3).
7. according to claim 1 or 4 described a kind of converter power transformer partial discharge test pressure-equalizing devices, it is characterized in that, the external diameter of upper grading ring (1) and lower uniform pressure ring (2) is 140cm, and diameter of section is 30cm; Distance between the bottom surface of the end face of upper grading ring (1) and lower uniform pressure ring (2) is 100cm.
8. according to claim 1 or 4 described a kind of converter power transformer partial discharge test pressure-equalizing devices, it is characterized in that, the external diameter of upper grading ring (1) and lower uniform pressure ring (2) is 110cm, and diameter of section is 20cm; Distance between the bottom surface of the end face of upper grading ring (1) and lower uniform pressure ring (2) is 85cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220461682 CN202870242U (en) | 2012-09-11 | 2012-09-11 | A voltage-equalizing device used for partial discharge test of a converter transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220461682 CN202870242U (en) | 2012-09-11 | 2012-09-11 | A voltage-equalizing device used for partial discharge test of a converter transformer |
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| CN202870242U true CN202870242U (en) | 2013-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220461682 Expired - Fee Related CN202870242U (en) | 2012-09-11 | 2012-09-11 | A voltage-equalizing device used for partial discharge test of a converter transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105929314A (en) * | 2016-06-01 | 2016-09-07 | 国网河北省电力公司电力科学研究院 | Ultrahigh frequency transformer partial discharge test grading ring lifting device |
| CN106098269A (en) * | 2016-06-28 | 2016-11-09 | 孙三友 | A kind of electric power grading ring |
-
2012
- 2012-09-11 CN CN 201220461682 patent/CN202870242U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105929314A (en) * | 2016-06-01 | 2016-09-07 | 国网河北省电力公司电力科学研究院 | Ultrahigh frequency transformer partial discharge test grading ring lifting device |
| CN105929314B (en) * | 2016-06-01 | 2019-01-25 | 国网河北省电力公司电力科学研究院 | A kind of extra-high voltage transformer partial discharge test grading ring hanging apparatus |
| CN106098269A (en) * | 2016-06-28 | 2016-11-09 | 孙三友 | A kind of electric power grading ring |
| CN107513637A (en) * | 2016-06-28 | 2017-12-26 | 孙三友 | A kind of electric power grading ring |
| CN106098269B (en) * | 2016-06-28 | 2018-02-16 | 中安达电气科技股份有限公司 | A kind of electric power grading ring |
| CN107513637B (en) * | 2016-06-28 | 2019-10-29 | 山东鲁电线路器材有限公司 | A kind of electric power grading ring |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE ELECTRIC NET CROP. Free format text: FORMER OWNER: QINGDAO ELECTRIC POWER RESEARCH INSTITUTE Effective date: 20131111 Owner name: QINGHAI ELECTRIC POWER CORPORATION ELECTRIC POWER Effective date: 20131111 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 810008 XINING, QINGHAI PROVINCE TO: 100031 DONGCHENG, BEIJING |
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| TR01 | Transfer of patent right |
Effective date of registration: 20131111 Address after: 100031 West Chang'an Avenue, Beijing, No. 86 Patentee after: State Grid Corporation of China Patentee after: Qinghai Electric Power Co., Ltd. Patentee after: Electric Power Research Institute of State Grid Qinghai Electric Power Company Patentee after: Qinghai Dianyan Technology Co., Ltd. Address before: 54 Xining West Road, Qinghai, No. 8, No. 810008 Patentee before: Qingdao Electric Power Research Institute |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130410 Termination date: 20200911 |
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| CF01 | Termination of patent right due to non-payment of annual fee |