CN205122376U - Oil -immersed transformer partial discharge test is with isolation transformer who restraines power supply interference - Google Patents
Oil -immersed transformer partial discharge test is with isolation transformer who restraines power supply interference Download PDFInfo
- Publication number
- CN205122376U CN205122376U CN201520717904.6U CN201520717904U CN205122376U CN 205122376 U CN205122376 U CN 205122376U CN 201520717904 U CN201520717904 U CN 201520717904U CN 205122376 U CN205122376 U CN 205122376U
- Authority
- CN
- China
- Prior art keywords
- transformer
- oil
- winding
- partial discharge
- pressure winding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Housings And Mounting Of Transformers (AREA)
Abstract
Oil -immersed transformer partial discharge test is with isolation transformer who restraines power supply interference, transformer ware body is located the transformer oil incasement that is full of transformer oil, 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 oil -immersed transformer 2 -2.5 doubly. The utility model discloses use oil -immersed transformer measurement of partial discharge, its outside signal interference that has significantly reduced has improved oil -immersed 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 oil-filled transformer, is specifically related to the isolation oil-filled transformer that a kind of oil-filled transformer partial discharge test suppresses power supply disturbance.
Background technology
In transformer test, for Um=72.5kV and rated capacity is 10000kVA and above and oil-filled transformer that is Um > 72.5kV all should carry out measurement of partial discharge, the maximum of local discharging level is 500pC.Oil-filled transformer measurement of partial discharge 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, this will affect stability and accuracy that partial discharge of transformer measures.The interference signal even had is greater than the local discharging level of oil-filled transformer, and measurement cannot be carried out.
According to standard GB/T 1094.3 " power transformer the 3rd part: insulation level Insulation Test and external insulation air gap " regulation, the background noise level of partial discharge test should be not more than 100pC.Simultaneously in order to guarantee to detect and record starting voltage and the extinction voltage of partial discharge, recommendation background noise level is far below 100pC.
Utility model content
The purpose of this utility model overcomes above-mentioned the deficiencies in the prior art, a kind of Existing during Partial Discharge Test for Transformer 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 oil-filled transformer partial discharge test isolating transformer suppressing power supply disturbance, comprise oil tank of transformer 12 and outlet terminal, transformer body is provided with in fuel tank 12, transformer body is positioned at the oil tank of transformer 12 being full of transformer oil, transformer body comprises iron core 11, three-phase low-voltage winding 14 and three-phase high-voltage winding 13, described iron core 11 circumference is provided with mutually corresponding low pressure winding 14 and high pressure winding 13 from inside to outside, 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 oil-filled 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 oil-filled transformer 2 is S
2, the rated capacity of isolation oil-filled transformer 1 is S
1, the no-load current percentage of tested oil-filled 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 oil-filled transformer experiment power supply input rated voltage, isolation oil-filled 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 6 and electric current I 6 are applied to tested oil-filled transformer.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, 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 oil-filled transformer measurement of partial discharge, 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 oil-filled transformer measurement of partial discharge.
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 threephase oil immersed transformer partial discharge test of the utility model embodiment;
Fig. 5 is the fundamental measurement line map that prior art does not have the threephase oil immersed transformer partial discharge test of isolating transformer;
Fig. 6 is the applying voltage system schematic diagram of the utility model embodiment oil-filled transformer partial discharge routine test.
In figure: 1, isolation oil-filled transformer 2, tested oil-filled transformer 3, office put test macro 11, iron core 12, fuel tank 13, high pressure winding 14, low pressure winding 15, internal shield 16, outer shielding layer 21, by formation testing change input winding 22, become output winding by formation testing.
Embodiment
As Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the oil-filled transformer partial discharge test isolating transformer suppressing power supply disturbance, comprise oil tank of transformer 12 and outlet terminal, transformer body is provided with in fuel tank 12, transformer body is positioned at the oil tank of transformer 12 being full of transformer oil, transformer body comprises iron core 11, three-phase low-voltage winding 14 and three-phase high-voltage winding 13, described iron core 11 circumference is provided with mutually corresponding low pressure winding 14 and high pressure winding 13 from inside to outside, internal shield 15 is circumferentially provided with between low pressure winding 14 and iron core 11, 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 oil-filled 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.S
1>=S
2* I
0%, the rated capacity of tested oil-filled transformer 2 is S
2, the rated capacity of isolation oil-filled transformer 1 is S
1, the no-load current percentage of tested oil-filled 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 oil-filled transformer experiment power supply input rated voltage, isolation oil-filled 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 oil-filled 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, 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 SFZ-125000/230 transformer carry out measurement of partial discharge 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 125000kVA;
Rated voltage 230/66kV;
Rated current 313.8/1093.5A;
Rated frequency 50Hz;
Number of phases three-phase;
Tapping range ± 8 × 1.25%;
Connection series number YNd11;
Type of cooling ONAF;
Voltage regulating mode on-load voltage regulation;
Insulation grade anti-corrosion A;
Office puts discharge capacity (pC) and requires to be less than 100.
Test basis GB1094.1-2013 " power transformer the 1st part general provisions ", GB1094.3-2003 " power transformer the 3rd part: insulation level, Insulation Test and external insulation air gap " and GB/T6451-2008 " oil-immersed 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 threephase oil immersed transformer partial discharge test of the utility model embodiment, become output winding 22 by formation testing to be connected with the input that test macro 3 is put in office, become input winding 21 by formation testing and be connected with experiment power supply.
1, experiment power supply:
1) test voltage 0 ~ 120000V;
2) rated frequency 200Hz;
3) number of phases three-phase.
2, test procedure
1) testing background noise level is 75pC.
2) test according to the applying voltage of the partial discharge of oil-filled transformer shown in Fig. 6 routine test:
---be not more than U
2switch on power under the voltage of/3;
---rise to 1.1Um/ √ 3, keep 5min;
---rise to U
2keep 5min;
---rise to U1 its protracted test time 30S
---be reduced to U incessantly at once after test
2, and keeping at least 5min, also measure local is discharged;
---be reduced to 1.1Um/ √ 3, keep 5min;
---when voltage is reduced to U
2when less than/3, cut off the electricity supply.
3) result of the test: recording tested partial discharge of transformer amount is 89pC.
As shown in Figure 4, conventionally there is no the fundamental measurement line map of the threephase oil immersed transformer partial discharge test of isolating transformer to carry out partial discharge test, increase by one isolation oil-filled transformer 1 of the present utility model compared with Fig. 5, become output winding 22 by formation testing to be connected with the input that test macro 3 is put in office, become input winding 21 by formation testing to be connected with the low pressure winding 14 of isolation oil-filled transformer 1, the high pressure winding 13 of isolation oil-filled transformer 1 is connected with experiment power supply.
1, isolating transformer parameter:
1) rated capacity 3150kVA;
2) rated voltage 132/6kV;
3) rated current 13.8/303.1A;
4) rated frequency 50Hz;
5) number of phases three-phase;
6) Connection series number Dyn11;
7) type of cooling ONAN;
8) office puts discharge capacity (pC) and is less than 10;
2, experiment power supply:
1) test voltage 0 ~ 120000V;
2) rated frequency 200Hz;
3) number of phases three-phase;
3, test procedure and result:
1) testing background noise level is 9Pc;
2) be 200Hz power supply in the input incoming frequency of isolating transformer, test pressurization and time press Fig. 6.Output induces 200Hz voltage and is applied to tested step down side.
---be not more than U
2switch on power under the voltage of/3;
---rise to 1.1Um/ √ 3, keep 5min;
---rise to U
2keep 5min;
---rise to U
1its protracted test time 30S
---be reduced to U incessantly at once after test
2, and keeping at least 5min, also measure local is discharged;
---be reduced to 1.1Um/ √ 3, keep 5min;
---when voltage is reduced to U
2when less than/3, cut off the electricity supply.
3) result of the test: recording tested partial discharge of transformer amount is 49pC.
The first test, supply voltage is applied directly on tested transformer, and its background noise level is 75pC, and tested partial discharge of transformer amount is 89pC; The second is tested, and supply voltage is applied on tested transformer through isolating transformer, and its background noise level is 9pC.As can be seen from, the first test, supply voltage is applied directly on tested transformer, and its background noise level is 75pC, than the partial discharge of transformer amount 49pC also high 26pC that the second test method records, 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 oil-filled transformer partial discharge test isolating transformer suppressing power supply disturbance, comprise oil tank of transformer (12) and outlet terminal, fuel tank is provided with transformer body in (12), transformer body is positioned at the oil tank of transformer (12) being full of transformer oil, transformer body comprises iron core (11), three-phase low-voltage winding (14) and three-phase high-voltage winding (13), described iron core (11) circumference is provided with mutually corresponding low pressure winding (14) and high pressure winding (13) from inside to outside, 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 oil-filled transformer (2) experiment power supply input rated voltage.
2. oil-filled transformer partial discharge 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. oil-filled transformer partial discharge test according to claim 1 and 2 suppresses the isolating transformer of power supply disturbance, it is characterized in that S1 >=S2*I0%, the rated capacity of tested oil-filled transformer (2) is S2, the rated capacity of isolation oil-filled transformer (1) is S1, and the no-load current percentage of tested oil-filled transformer (2) is I0%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520717904.6U CN205122376U (en) | 2015-09-16 | 2015-09-16 | Oil -immersed transformer partial discharge test is with isolation transformer who restraines power supply interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520717904.6U CN205122376U (en) | 2015-09-16 | 2015-09-16 | Oil -immersed transformer partial discharge test is with isolation transformer who restraines power supply interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205122376U true CN205122376U (en) | 2016-03-30 |
Family
ID=55577962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520717904.6U Active CN205122376U (en) | 2015-09-16 | 2015-09-16 | Oil -immersed transformer partial discharge test is with isolation transformer who restraines power supply interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205122376U (en) |
-
2015
- 2015-09-16 CN CN201520717904.6U patent/CN205122376U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Hori et al. | Internal winding failure due to resonance overvoltage in distribution transformer caused by winter lightning | |
| CN105097252A (en) | Isolation transformer capable of suppressing power interference for partial discharge test of dry-type transformer | |
| CN110875117A (en) | Combined three-phase integrated electronic current and voltage transformer | |
| CN105097253A (en) | Isolation transformer for suppressing power interference in local discharging test of oil immersed transformer | |
| CN202057764U (en) | Variable frequency resonance voltage withstand test device | |
| CN201820628U (en) | Electronic current and voltage transformer | |
| CN106856373A (en) | A kind of harmonic wave generation device | |
| CN205122376U (en) | Oil -immersed transformer partial discharge test is with isolation transformer who restraines power supply interference | |
| CN102820129A (en) | Filtering type power transformer integrated system and implementation method thereof | |
| CN204966261U (en) | Dry -type transformer partial discharge test is with isolation transformer who restraines power supply interference | |
| Yu et al. | Simulation Analysis on Conducted EMD Caused by Valves in $\pm $800 kV UHVDC Converter Station | |
| CN108666111A (en) | Signal isolation transformer | |
| CN201438412U (en) | Zero sequence voltage transformer for neutral point | |
| CN201229849Y (en) | External integration type Rogowski coil current mutual inductor | |
| Li et al. | Study on the Effects of the DC Bias on the Harmonic Characteristics of the New Converter Transformer | |
| CN210535493U (en) | Built-in current transformer structure | |
| CN211294795U (en) | Combined three-phase integrated electronic current and voltage transformer | |
| CN207689549U (en) | A kind of more current channel single-phase electronic energy meter gauge stand structures | |
| CN203038774U (en) | Indoor dry-type voltage transformer | |
| CN201229847Y (en) | Weak output capacitor type voltage mutual inductor | |
| CN105004950A (en) | Detection method of low-frequency transformer | |
| Peng et al. | Design requirement and DC bias analysis on HVDC converter transformer | |
| CN204270854U (en) | A kind of high voltage flameproof vacuum distribution equipment electronic current mutual inductor | |
| Guangfan et al. | Research and development of UHV AC transformer and shunt reactor | |
| CN203871166U (en) | High saturation flux density anti-resonance voltage transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |