CN202870240U - A partial discharge testing device of a converter transformer at a high altitude locality - Google Patents
A partial discharge testing device of a converter transformer at a high altitude locality Download PDFInfo
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- CN202870240U CN202870240U CN 201220461282 CN201220461282U CN202870240U CN 202870240 U CN202870240 U CN 202870240U CN 201220461282 CN201220461282 CN 201220461282 CN 201220461282 U CN201220461282 U CN 201220461282U CN 202870240 U CN202870240 U CN 202870240U
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Abstract
The utility model discloses a partial discharge testing device of a converter transformer at a high altitude locality. The partial discharge testing device is mainly designed for partial discharge test of a plus-minus 400 kV converter transformer in Qaidam converter transformer station for Qinghai and Tibet networking engineering and comprises a variable-frequency power source without partial discharge, an exciting transformer without partial discharge, a compensation reactor without partial discharge, and a capacitive voltage divider without partial discharge. The variable-frequency power source without partial discharge is connected with two ends of the exciting transformer without partial discharge. One end of the compensation reactor without partial discharge is connected with ground, while the other end of the compensation reactor without partial discharge is connected with the output end of the exciting transformer without partial discharge. One end of the capacitive voltage divider without partial discharge is connected with ground, while the other end of the capacitive voltage divider without partial discharge is connected with the output end of the exciting transformer without partial discharge. The partial discharge testing device may satisfy operational requirement in the high altitude locality.
Description
[technical field]
The utility model belongs to the power technology field, particularly a kind of high altitude localities converter power transformer local discharge test device.
[background technology]
Converter power transformer is to be connected between transverter and the AC system electric energy is transferred to transverter or is transferred to the transformer of AC system from transverter from AC system in current conversion station, the bridge that to be AC network be connected with direct current with direct current network and alternating current, its importance is self-evident.
The interior insulation system of converter power transformer mainly is paper oil insulation, 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 because the insufficient and residual bubble of dipping, 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 that 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 converter power transformer latent fault.
At present, the converting plant mainly is built in the low altitude area, and the converter power transformer local discharge test device also mainly is to be applied in the low altitude area, and its external insulation performance, interference free performance are difficult to satisfy the needs of high height above sea level.Mean sea level is all more than 3000 meters in the DC networking project of Qinghai-Tibet, the Qaidam change of current becomes the plateau of building 2850 meters of height above sea level in, the development of ± 400kV converter power transformer local discharge test device is used, and must overcome under the high height above sea level condition each factor to the impact of test unit.For guarantee ± the 400kV change of current becomes in examination and puts into operation under according to qualified condition, and the parameter of test unit has been proposed special requirement.Therefore, development satisfy ± test unit that 400kV change of current changed situation section discharge test requires becomes the key link that warranty test carries out smoothly.
[utility model content]
For above technical matters, the utility model provides a kind of high altitude localities converter power transformer local discharge test device, test unit satisfies the requirement of external insulation in high height above sea level uses, has enough capacity, can satisfy the requirement of change of current changed situation section discharge test electric current, test unit works under high height above sea level (greater than 2500m), the large temperature difference (35 ℃-45 ℃) condition, and test unit compact conformation, easy transportation and installation, use are stablized.
For solving above technical matters, the utility model by the following technical solutions:
A kind of high altitude localities converter power transformer local discharge test device, comprise the no partial discharge frequency conversion power supply, put exciting transformer, put compensation reactor without office without office, and without office's discharge appearance voltage divider, described no partial discharge frequency conversion power supply is connected to the two ends of putting exciting transformer without office, described without the office put compensation reactor an end ground connection, the other end is connected to the output terminal of putting exciting transformer without office, a described end ground connection without office's discharge appearance voltage divider, the other end is connected to the output terminal of putting exciting transformer without office.
As preferred embodiment of the present utility model, the described current potential mutual inductor that is in series with the Monitoring Line electric current between the reactor of putting without office's discharge appearance voltage divider with without office;
As preferred embodiment of the present utility model, the described dry arcing distance of putting the High voltage output sleeve pipe of exciting transformer without office is 1.5 ~ 2 meters;
As preferred embodiment of the present utility model, described high-pressure side of putting exciting transformer without office is equipped with the grading ring without bloom;
As preferred embodiment of the present utility model, described putting between the high and low pressure winding of exciting transformer and iron core without office all established the electrostatic screening layer;
As preferred embodiment of the present utility model, described to put reactor be the open core structure without office;
As preferred embodiment of the present utility model, described shell upper and lower cover plates and the upper lower flange of putting reactor without office all adopts not magnetic conduction or diamagnetism plate;
As preferred embodiment of the present utility model, the described discharge without office held the first electric capacity and the second electric capacity that voltage divider comprises series connection, and described the second electric capacity adopts the identical material of temperature system, coefficient of frequency of the first electric capacity;
As preferred embodiment of the present utility model, described the first electric capacity is epoxy cylinder shell paper oil insulation structure capacitive device.
Compared with prior art, the utility model high altitude localities converter power transformer local discharge test device has the following advantages at least: the utility model test unit is applicable to the high altitude localities and carries out discharge test, can in time detect electric discharge phenomena.
[description of drawings]
Fig. 1 is the circuit structure diagram of the utility model test unit.
[embodiment]
See also shown in Figure 1, the utility model provides a kind of high altitude localities converter power transformer local discharge test device, comprise the no partial discharge frequency conversion power supply, put exciting transformer, put compensation reactor without office without office, and without office's discharge appearance voltage divider, described no partial discharge frequency conversion power supply is connected to the two ends of putting exciting transformer without office, described without the office put compensation reactor an end ground connection, the other end is connected to the output terminal of putting exciting transformer without office, a described end ground connection without office's discharge appearance voltage divider, the other end is connected to the output terminal of putting exciting transformer without office.The utility model is put exciting transformer bushing external insulation distance according to the requirement among the GB 311.1-1997 " Insulation Coordination of high-tension power transmission and transformation equipment " without office, and its bushing external insulation level can satisfy the requirement of using more than 3000 meters.Put compensation reactor without office and all adopt loop design under the condition that satisfies the external insulation distance, better evenly internal field prevents bloom, obviously improves in the test because the interference that bloom brings.
Further characteristics of the present utility model and improvement are:
Be applicable to no partial discharge frequency conversion power supply one cover under the high height above sea level, adopted to comprise no partial discharge frequency conversion power cabinet, intelligent frequency-conversion power controling box, variable-frequency power sources control optical fiber, high-tension measurement terminal.This variable-frequency power sources has anti-electric field interference performance, under highfield disturbs, and measuring accuracy and control protection normal operation.The utility model variable-frequency power sources is for recommending the amplifying type variable-frequency power sources, the linear matrix that is comprised of high power transistor amplifies network, and use up-to-date DSP industrial control unit (ICU) and optical fiber transmission technique, be operated in linear amplification region, thereby obtain the standard sine waveform consistent with signal source, because its inside without any the circuit that is operated under the on off state, does not therefore produce serious undesired signal, is suitable as the power supply of partial discharge test.
The inflatable that is applicable under the high height above sea level is put exciting transformer without office, the external insulation level of its High voltage output sleeve pipe satisfies the requirement (dry arcing distance that is the High voltage output sleeve pipe is 1.5～2) of 3000 meters uses of height above sea level, and under high-pressure side configuration trial voltage without the grading ring of bloom, low-pressure side configuration input voltage is the winding of 2 * 350/400/450V.Its characteristics are: put exciting transformer without office and adopt iron-clad inflatable, insulating medium SF6 gas; All establishing the electrostatic screening layer between exciting transformer high and low pressure winding and iron core, both has been exciting transformer, is again isolating transformer; Fastening location in the structure of the group of exciting transformer, parts such as sleeve pipe, valve etc. and not overslaugh of position lifting, transportation and the transportation, simultaneously with transformer high-voltage, low-tension bushing enough electrical safety distances are arranged, do not produce in use shelf depreciation and corona discharge.
Be applicable to put compensation reactor one cover without office under the high height above sea level, comprise 2 120kV, 4 60kV reactors, its characteristics are that the design of this reactor all adopts the open core structure, copper conductor winding, oil-immersed self-cooled.Adopt epoxy resins insulation cylinder shell, have the nargin that enough electric, physical strengths, necessary heat-sinking capability and oil expand with heat and contract with cold.Shell upper and lower cover plates, upper lower flange all adopt not magnetic conduction or diamagnetism plate.Reactor is equipped with reliably lifting special facilities, shell spraying insullac, and the surface is coated with the epoxy hydrophobic coat.
Be applicable to discharging without office under the high height above sea level and hold voltage divider one cover, comprise the first capacitor C 1 and second capacitor C 2 of series connection, its characteristics are that the first capacitor C 1 is epoxy cylinder shell paper oil insulation structure capacitive device; The second capacitor C 2 is selected temperature coefficient, the coefficient of frequency material identical with the first capacitor C 1, and temperature coefficient is little, and angular displacement is little, and intrinsic standoff ratio is constant in 30～300Hz scope.
The above only is a kind of embodiment of the present utility model, it or not whole or unique embodiment, the conversion of any equivalence that those of ordinary skills take technical solutions of the utility model by reading the utility model instructions is claim of the present utility model and contains.
Claims (9)
1. high altitude localities converter power transformer local discharge test device, it is characterized in that: comprise the no partial discharge frequency conversion power supply, put exciting transformer, put compensation reactor without office without office, and without office's discharge appearance voltage divider, described no partial discharge frequency conversion power supply is connected to the two ends of putting exciting transformer without office, described without the office put compensation reactor an end ground connection, the other end is connected to the output terminal of putting exciting transformer without office, a described end ground connection without office's discharge appearance voltage divider, the other end is connected to the output terminal of putting exciting transformer without office.
2. a kind of high altitude localities as claimed in claim 1 converter power transformer local discharge test device is characterized in that: describedly hold voltage divider and put the current potential mutual inductor that is in series with the Monitoring Line electric current between the reactor without office without office's discharge.
3. a kind of high altitude localities as claimed in claim 1 or 2 converter power transformer local discharge test device is characterized in that: the described dry arcing distance of putting the High voltage output sleeve pipe of exciting transformer without office is 1.5 ~ 2 meters.
4. a kind of high altitude localities as claimed in claim 3 converter power transformer local discharge test device is characterized in that: described high-pressure side of putting exciting transformer without office is equipped with the grading ring without bloom.
5. a kind of high altitude localities as claimed in claim 3 converter power transformer local discharge test device is characterized in that: described putting between the high and low pressure winding of exciting transformer and iron core without office all established the electrostatic screening layer.
6. a kind of high altitude localities as claimed in claim 1 or 2 converter power transformer local discharge test device is characterized in that: described to put reactor without office be the open core structure.
7. a kind of high altitude localities as claimed in claim 6 converter power transformer local discharge test device is characterized in that: described shell upper and lower cover plates and the upper lower flange of putting reactor without office all adopts not magnetic conduction or diamagnetism plate.
8. a kind of high altitude localities as claimed in claim 1 or 2 converter power transformer local discharge test device, it is characterized in that: the described discharge without office held the first electric capacity and the second electric capacity that voltage divider comprises series connection, and described the second electric capacity adopts the identical material of temperature system, coefficient of frequency of the first electric capacity.
9. a kind of high altitude localities as claimed in claim 8 converter power transformer local discharge test device, it is characterized in that: described the first electric capacity is epoxy cylinder shell paper oil insulation structure capacitive device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220461282 CN202870240U (en) | 2012-09-11 | 2012-09-11 | A partial discharge testing device of a converter transformer at a high altitude locality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220461282 CN202870240U (en) | 2012-09-11 | 2012-09-11 | A partial discharge testing device of a converter transformer at a high altitude locality |
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| Publication Number | Publication Date |
|---|---|
| CN202870240U true CN202870240U (en) | 2013-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220461282 Expired - Fee Related CN202870240U (en) | 2012-09-11 | 2012-09-11 | A partial discharge testing device of a converter transformer at a high altitude locality |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103499779A (en) * | 2013-10-17 | 2014-01-08 | 国家电网公司 | UHV (Ultra High Voltage) transformer field variable frequency partial discharge test device |
| CN103605058A (en) * | 2013-12-03 | 2014-02-26 | 山东电力设备有限公司 | Device for carrying out partial discharge tests simultaneously on multiple sets of transformers |
| CN104198900A (en) * | 2014-08-04 | 2014-12-10 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Testing device for long term voltage induction and partial discharge measurement test |
| CN104714158A (en) * | 2015-03-11 | 2015-06-17 | 国家电网公司 | Alternating-current ultrahigh voltage main transformer and regulation transformer combined partial discharge testing system and method |
| CN107271869A (en) * | 2017-06-30 | 2017-10-20 | 国家电网公司 | High altitude localities 750kV shunt reactor partial discharge test methods |
| CN110398674A (en) * | 2019-08-30 | 2019-11-01 | 国网山西省电力公司电力科学研究院 | A kind of extra-high voltage parallel reactance is pressure-resistant and local discharge test device |
-
2012
- 2012-09-11 CN CN 201220461282 patent/CN202870240U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103499779A (en) * | 2013-10-17 | 2014-01-08 | 国家电网公司 | UHV (Ultra High Voltage) transformer field variable frequency partial discharge test device |
| CN103605058A (en) * | 2013-12-03 | 2014-02-26 | 山东电力设备有限公司 | Device for carrying out partial discharge tests simultaneously on multiple sets of transformers |
| CN104198900A (en) * | 2014-08-04 | 2014-12-10 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Testing device for long term voltage induction and partial discharge measurement test |
| CN104714158A (en) * | 2015-03-11 | 2015-06-17 | 国家电网公司 | Alternating-current ultrahigh voltage main transformer and regulation transformer combined partial discharge testing system and method |
| CN104714158B (en) * | 2015-03-11 | 2017-12-15 | 国家电网公司 | AC extra high voltage main transformer modulation combines partial discharge test system and method |
| CN107271869A (en) * | 2017-06-30 | 2017-10-20 | 国家电网公司 | High altitude localities 750kV shunt reactor partial discharge test methods |
| CN110398674A (en) * | 2019-08-30 | 2019-11-01 | 国网山西省电力公司电力科学研究院 | A kind of extra-high voltage parallel reactance is pressure-resistant and local discharge test device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130410 Termination date: 20130911 |