CN204966261U - Dry -type transformer partial discharge test is with isolation transformer who restraines power supply interference - Google Patents
Dry -type transformer partial discharge test is with isolation transformer who restraines power supply interference Download PDFInfo
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- CN204966261U CN204966261U CN201520717978.XU CN201520717978U CN204966261U CN 204966261 U CN204966261 U CN 204966261U CN 201520717978 U CN201520717978 U CN 201520717978U CN 204966261 U CN204966261 U CN 204966261U
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Abstract
Dry -type transformer partial discharge test is with isolation transformer who restraines power supply interference, the linear motor mover comprises an iron core, three -phase low voltage winding, the three -phase high voltage winding and the epoxy resin casting body, be equipped with the internal shield layer on the circumference between low voltage winding and the iron core, be equipped with the external shielding layer on the circumference between low voltage winding and the high voltage winding, internal shield layer and external shielding layer shape are the height and low voltage winding and high voltage winding highly uniform of cyclic annular cylindric internal shield layer of opening and external shielding layer, the equal ground connection of internal shield layer and external shielding layer, one of them winding among low voltage winding and the high voltage winding is connected for triangle -shaped, the another one winding is star connection, the rated voltage who sets for low voltage winding is by the experimental power input end rated voltage's of examination dry -type transformer 2 -2.5 doubly. The utility model discloses use dry -type transformer measurement of partial discharge, its outside signal interference that has significantly reduced has improved dry -type transformer measurement of partial discharge's stability and accuracy.
Description
Technical field
The utility model belongs to transformer technology field, relates to a kind of dry-type transformer, is specifically related to the isolation dry-type transformer that a kind of partial discharge of dry-type transformer test suppresses power supply disturbance.
Background technology
All dry-type transformers all should carry out measurement of partial discharge, and the maximum of local discharging level is 10pC.Partial discharge of dry-type transformer measuring process has multiple disturbing factor, and the interference wherein from experiment power supply is one of them.Interference from experiment power supply includes, but is not limited to the switching manipulation of electric power network, the electric discharge of generating set, voltage regulator, intermediate transformer self, test loop high-voltage corona and point discharge, the multipoint earthing of grounding system, current carrying contacts loose contact, radio transit signal etc., these interference signals all can be introduced tested transformer by the coupling of experiment power supply circuit, and to be mistaken as be the discharge pulse of transformer, sometimes disturb partial discharge quantity to be multiplied, this will affect stability and the accuracy of partial discharge of dry-type transformer measurement.The interference signal even had is greater than the local discharging level of dry-type transformer, and measurement cannot be carried out.
Utility model content
The purpose of this utility model overcomes above-mentioned the deficiencies in the prior art, a kind of partial discharge of dry-type transformer test is provided to suppress the isolating transformer of power supply disturbance, this isolating transformer self does not produce partial discharge, and by the high-frequency signal of this isolating transformer decay from mains side, but the test voltage of low frequency and electric current can be allowed to pass through.
For achieving the above object, the utility model have employed following technical scheme:
The partial discharge of dry-type transformer test isolation dry-type transformer suppressing power supply disturbance, comprise folder from top to bottom 17, base 18, iron core 11, three-phase low-voltage winding 14, three-phase high-voltage winding 13, epoxy resin poured body 12, described iron core 11 is arranged on base 18, described iron core 11 circumference is provided with mutually corresponding low pressure winding 14 and high pressure winding 13 from inside to outside, epoxy resin poured body 12 is respectively equipped with outside described low pressure winding 14 and high pressure winding 13, it is characterized in that: between low pressure winding 14 and iron core 11, be circumferentially provided with internal shield 15, outer shielding layer 16 is circumferentially provided with between low pressure winding 14 and high pressure winding 13, internal shield 14 and outer shielding layer 16 are metal forming, internal shield 14 and outer shielding layer 16 shape be open annular tubular internal shield 14 with the height of outer shielding layer 16 and low pressure winding 14 and high pressure winding 13 highly consistent, internal shield 14 and outer shielding layer 16 all ground connection, low pressure winding 14 and one of them winding in high pressure winding 13 are that triangle is connected, another one winding is Y-connection, the rated voltage U2 of setting low pressure winding 14 is 2-2.5 times of tested dry-type transformer 2 experiment power supply input rated voltage.
During concrete enforcement, the magnetic flux density design load of iron core 11, below its saturation point, prevents experiment power supply by producing harmonic wave and wave distortion during isolating transformer.
During concrete enforcement, S
1>=S
2* I
0%, the rated capacity of tested dry-type transformer 2 is S
2, the rated capacity of isolation dry-type transformer 1 is S
1, the no-load current percentage of tested dry-type transformer 2 is I
0%.
When partial discharge test, due to the rated voltage U of low pressure winding
2for 2-2.5 times of tested Dry-Type Transformer Test power input rated voltage, isolation dry-type transformer high pressure winding 13 accepts the voltage U that power supply applies
5and electric current I
5, through electromagnetism transform, by low pressure winding 14, voltage U is applied to tested dry-type transformer
6and electric current I
6.Because U when in partial discharge test
6=1.8U
4< U2, namely U
6be less than the rated voltage U of the low pressure winding 14 of isolating transformer
2.Isolating transformer self does not produce partial discharge when being less than its rated voltage and running, simultaneously through internal shield and outer shielding layer, signal will be attenuated to 1 order of magnitude by the interference from power supply, the high-frequency impulse interference of electrical network can be isolated after isolating transformer access pilot system, the partial discharge interference of power end is reduced.
The beneficial effects of the utility model are: the utility model is applied to partial discharge of dry-type transformer and measures, isolating transformer self does not produce partial discharge when being less than its rated voltage and running, simultaneously through internal shield and outer shielding layer, signal will be attenuated to 1 order of magnitude by the interference from power supply, by the high-frequency signal of this isolating transformer decay from mains side, but the test voltage of low frequency and electric current can be allowed to pass through.Greatly reduce outside signal disturbing, improve stability and the accuracy of partial discharge of dry-type transformer measurement.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, utility model is further illustrated.
Fig. 1 is the contour structures schematic diagram of the utility model isolating transformer embodiment;
Fig. 2 is the elementary diagram of the utility model isolating transformer embodiment;
Fig. 3 is the stem stem sectional schematic diagram of the utility model isolating transformer embodiment;
Fig. 4 is the fundamental measurement line map of the dry-type three-phase transformer partial discharge test of the utility model embodiment;
Fig. 5 is the fundamental measurement line map that prior art does not have the dry-type three-phase transformer partial discharge test of isolating transformer;
Fig. 6 is the applying voltage system schematic diagram of the utility model embodiment partial discharge of dry-type transformer routine test.
In figure: 1, isolate dry-type transformer 2, tested dry-type transformer 3, test macro 11, iron core 12, epoxy resin poured body 13, high pressure winding 14, low pressure winding 15, internal shield 16, outer shielding layer 17, folder 18, base 21 are put in office, tested dry change inputs winding 22, tested dry change exports winding.
Embodiment
As Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the partial discharge of dry-type transformer test isolation dry-type transformer suppressing power supply disturbance, comprise folder from top to bottom 17, base 18, iron core 11, three-phase low-voltage winding 14, three-phase high-voltage winding 13, epoxy resin poured body 12, described iron core 11 is arranged on base 18, described iron core 11 circumference is provided with mutually corresponding low pressure winding 14 and high pressure winding 13 from inside to outside, epoxy resin poured body 12 is respectively equipped with outside described low pressure winding 14 and high pressure winding 13, it is characterized in that: between low pressure winding 14 and iron core 11, be circumferentially provided with internal shield 15, outer shielding layer 16 is circumferentially provided with between low pressure winding 14 and high pressure winding 13, internal shield 14 and outer shielding layer 16 are metal forming, internal shield 14 and outer shielding layer 16 shape be open annular tubular internal shield 14 with the height of outer shielding layer 16 and low pressure winding 14 and high pressure winding 13 highly consistent, internal shield 14 and outer shielding layer 16 all ground connection, low pressure winding 14 is Y-connection, high pressure winding 13 is triangle connection, another one winding is, the rated voltage U of setting low pressure winding 14
2for 2-2.5 times of tested dry-type transformer 2 experiment power supply input rated voltage.The magnetic flux density design load of iron core 11, below its saturation point, prevents experiment power supply by producing harmonic wave and wave distortion during isolating transformer.S1 >=S2*I0%, the rated capacity of tested dry-type transformer 2 is S2, and the rated capacity of isolation dry-type transformer 1 is S1, and the no-load current percentage of tested dry-type transformer 2 is I0%.
When partial discharge test, due to the rated voltage U of low pressure winding
2for 2-2.5 times of tested Dry-Type Transformer Test power input rated voltage, isolation dry-type transformer high pressure winding 13 accepts the voltage U that power supply applies
5and electric current I
5, through electromagnetism transform, by low pressure winding 14, voltage U is applied to tested dry-type transformer
6and electric current I
6.Because the U when partial discharge test
6=1.8U
4< U2, namely U
6be less than the rated voltage U of the low pressure winding 14 of isolating transformer
2.Isolating transformer self does not produce partial discharge when being less than its rated voltage and running, and simultaneously through internal shield and outer shielding layer, signal will be attenuated to 1 order of magnitude by the interference from power supply.
Be as follows for 1 SCB11-1250/10 dry-type transformer actual carry out measurement of partial discharge time adopt a contrast test of prior art and the utility model structure.
Test specimen parameter is as follows:
Rated capacity 1250kVA;
Rated voltage 10/0.4kV;
Rated current 72.2/1804.3A;
Rated frequency 50Hz;
Number of phases three-phase;
Tapping range ± 2 × 2.5%;
Connection series number Dyn11;
Type of cooling AN;
Insulation grade anti-corrosion F;
Office puts discharge capacity (pC) and is less than 10.
Test basis GB1094.11-2007 " power transformer the 11st part dry-type transformer ", GB/T10228-2008 " dry-type power transformer technical parameter and requirement ".
As shown in Figure 5, partial discharge test is carried out according to the fundamental measurement line map of the dry-type three-phase transformer partial discharge test of the utility model embodiment, tested dry change exports winding 22 and is connected with the input that test macro 3 is put in office, and tested dry change input winding 21 is connected with experiment power supply.
1, experiment power supply
1) test voltage 0 ~ 800V;
2) rated frequency 200Hz;
3) number of phases three-phase.
2, test procedure and result:
1) testing background noise level is 7.5pC.
2) test according to the applying voltage of the routine test of partial discharge of dry-type transformer shown in Fig. 6, applying frequency in tested dry-type transformer low-pressure side is 200Hz, 1.8 times of rated voltages (720V), pass through 30S, then voltage is down to 1.3 times of rated voltages (520V), recording tested partial discharge of dry-type transformer amount is 11.3pC.
As shown in Figure 4, conventionally there is no the fundamental measurement line map of the dry-type three-phase transformer partial discharge test of isolating transformer to carry out partial discharge test, increase by one isolation dry-type transformer 1 of the present utility model compared with Fig. 5, tested dry change exports winding 22 and is connected with the input that test macro 3 is put in office, the tested dry input winding 21 that becomes is connected with the low pressure winding 14 of isolation dry-type transformer 1, and the high pressure winding 13 of isolation dry-type transformer 1 is connected with experiment power supply.
1, isolating transformer parameter:
1) rated capacity 80kVA;
2) rated voltage 1.0/1.0kV;
3) rated current 46.2/46.2A;
4) rated frequency 50Hz;
5) number of phases three-phase;
6) Connection series number Dyn11;
7) type of cooling AN;
8) insulation grade anti-corrosion F;
9) office puts discharge capacity (pC) and is less than 3.
2, experiment power supply
1) test voltage 0 ~ 800V;
2) rated frequency 200Hz;
3) number of phases three-phase.
6, test procedure and result:
1) testing background noise level is 2.5pC.
2) test according to the applying voltage of the routine test of partial discharge of dry-type transformer shown in Fig. 6, the input incoming frequency of isolating transformer be 200Hz, voltage is 720V, it is that the 720V voltage of 200Hz is applied to tested dry-type transformer low-pressure side 30S that output induces frequency, then voltage is down to 1.3 times of rated voltages (520V), recording tested partial discharge of dry-type transformer amount is 8.4pC.
The first test, supply voltage is applied directly on tested dry-type transformer, and its background noise level is 7.5pC, and tested partial discharge of dry-type transformer amount is 11.3pC; The second is tested, and supply voltage is applied on tested dry-type transformer through isolating transformer, and its background noise level is 2.5pC.As can be seen from, the first test, supply voltage is applied directly on tested dry-type transformer, and its background noise level is 7.5pC, than partial discharge of dry-type transformer amount limit value 10pC only low 2.5pC, does not meet test requirements document.
Finally, it should be pointed out that above embodiment is only the more representational example of the utility model.Obviously, the utility model is not limited to above-described embodiment, can also have many distortion.Every above embodiment is done according to technical spirit of the present utility model any simple modification, equivalent variations and modification, all should think and belong to protection range of the present utility model.
Claims (3)
1. the partial discharge of dry-type transformer test isolating transformer suppressing power supply disturbance, comprise folder from top to bottom (17), base (18), iron core (11), three-phase low-voltage winding (14), three-phase high-voltage winding (13), epoxy resin poured body (12), described iron core (11) is arranged on base (18), described iron core (11) circumference is provided with mutually corresponding low pressure winding (14) and high pressure winding (13) from inside to outside, described low pressure winding (14) and high pressure winding (13) outside are respectively equipped with epoxy resin poured body (12), it is characterized in that: between low pressure winding (14) and iron core (11), be circumferentially provided with internal shield (15), outer shielding layer (16) is circumferentially provided with between low pressure winding (14) and high pressure winding (13), internal shield (14) and outer shielding layer (16) are metal forming, internal shield (14) and outer shielding layer (16) shape be open annular tubular internal shield (14) with the height of outer shielding layer (16) and low pressure winding (14) and high pressure winding (13) highly consistent, internal shield (14) and outer shielding layer (16) all ground connection, low pressure winding (14) and one of them winding in high pressure winding (13) are that triangle is connected, another one winding is Y-connection, the rated voltage of setting low pressure winding (14) is 2-2.5 times of tested dry-type transformer (2) experiment power supply input rated voltage.
2. partial discharge of dry-type transformer test according to claim 1 suppresses the isolating transformer of power supply disturbance, it is characterized in that the magnetic flux density design load of iron core (11) is below its saturation point.
3. partial discharge of dry-type transformer test according to claim 1 and 2 suppresses the isolating transformer of power supply disturbance, it is characterized in that S
1>=S
2* I
0%, the rated capacity of tested dry-type transformer (2) is S2, and the rated capacity of isolation dry-type transformer (1) is S
1, the no-load current percentage of tested dry-type transformer (2) is I
0%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520717978.XU CN204966261U (en) | 2015-09-16 | 2015-09-16 | Dry -type transformer partial discharge test is with isolation transformer who restraines power supply interference |
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|---|---|---|---|
| CN201520717978.XU CN204966261U (en) | 2015-09-16 | 2015-09-16 | Dry -type transformer partial discharge test is with isolation transformer who restraines power supply interference |
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| Publication Number | Publication Date |
|---|---|
| CN204966261U true CN204966261U (en) | 2016-01-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105097253A (en) * | 2015-09-16 | 2015-11-25 | 浙江江山变压器股份有限公司 | Isolation transformer for suppressing power interference in local discharging test of oil immersed transformer |
-
2015
- 2015-09-16 CN CN201520717978.XU patent/CN204966261U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105097253A (en) * | 2015-09-16 | 2015-11-25 | 浙江江山变压器股份有限公司 | Isolation transformer for suppressing power interference in local discharging test of oil immersed transformer |
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| GR01 | Patent grant |