CN103063930A - Measuring system and measuring method for loss and temperature rise of transformer structural components - Google Patents
Measuring system and measuring method for loss and temperature rise of transformer structural components Download PDFInfo
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- CN103063930A CN103063930A CN2012105779215A CN201210577921A CN103063930A CN 103063930 A CN103063930 A CN 103063930A CN 2012105779215 A CN2012105779215 A CN 2012105779215A CN 201210577921 A CN201210577921 A CN 201210577921A CN 103063930 A CN103063930 A CN 103063930A
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Abstract
The invention relates to a measuring system and a measuring method for loss and temperature rise of transformer structural components, and belongs to the technical field of transformer structural component tests. The measuring method for the loss of the transformer structural components comprises constructing space magnetic field symmetrical planes through two coils which are the same in structure and includes an auxiliary coil and a magnet exciting coil, measuring the loss of the magnet exciting coil by the measuring method for the loss and the temperature rise of the transformer structural components, measuring total loss by using the magnet exciting coil and measured structural components, separating the loss of the magnet exciting coil and the loss of the measured structural components through making difference, and obtaining the loss of the measured structural components. The measuring method for the temperature rise of the transformer structural components includes filling transformer oil in an oil tank, obtaining the temperature rise of the magnet exciting coil through measuring thermal resistance, and measuring the temperature rise of the measured structural components through temperature detection sensors which are arranged on the surfaces of the measured structural components and an oil channel of the oil tank. The measuring system and the measuring method for the loss and the temperature rise of the transformer structural components simultaneously accomplish simultaneous measurements of the loss and the temperature rise of the transformer structural components, and are used for laying down product designing schemes and verification electromagnetic calculation methods when combined with engineering applications.
Description
Technical field
The present invention relates to measuring system and the measuring method of a kind of transformer device structure spare loss and temperature rise, belong to transformer device structure spare experimental technique field.
Background technology
Development along with national economy, to UHV (ultra-high voltage), extra-high voltage development, capacity also increases the electric pressure of China's electrical network gradually, and the separate unit capacity of large-scale power transformer has been increased to 1500MVA, the stray field of transformer inside strengthens, and transformer device structure spare local overheating problem is become increasingly conspicuous.Add affected by traffic condition, the size of transformer is restricted, and necessary accurate evaluation local hot spot takes favourable measure to be avoided.Structural member in the transformer can produce eddy current loss and magnetic hysteresis loss such as folder, arm-tie, shielding, fuel tank etc. under the effect of stray field, cause the transformer added losses to increase, and can cause the structural member local overheating when serious, makes insulation ag(e)ing, even damages.Therefore, analysis and measuring transformer structural part loss and temperature rise thereof are significant to Energy Saving for Transformer and safe operation.At present, even background technology does not have structural part loss and the simultaneously-measured device and method of temperature rise.
Summary of the invention
The object of the invention provides measuring system and the measuring method of a kind of transformer device structure spare loss and temperature rise, finishes the loss of transformer device structure spare and temperature rise and measures simultaneously, solves the problems referred to above that exist in the background technology.
Technical scheme of the present invention is:
The measuring system of a kind of transformer device structure spare loss and temperature rise, comprise base plate, fuel tank, power analyzer, variable-frequency power sources, field coil, ancillary coil and tested structural member, field coil and ancillary coil are identical, power analyzer is connected on the field coil side, variable-frequency power sources is to field coil and ancillary coil power supply, and fuel tank, field coil, ancillary coil and tested structural member are arranged on the base plate; Oil duct at tested structural member surface and fuel tank is provided with temperature probe, by the temperature probe on oil duct and tested structural member surface, measures tested structural member temperature rise.
The present invention also is provided with the movable supporting plate of field coil support, track, tested structural member support, coil cushion block and ancillary coil, track is set on the base plate, the tested structural member support of parallel placement and field coil support in the fuel tank, coil cushion block is placed on the field coil support, the movable supporting plate of ancillary coil is placed in orbit, tested structural member is placed on the tested structural member support, and field coil is fixed on the field coil support, and ancillary coil is placed on the movable supporting plate of ancillary coil; The position of ancillary coil is adjusted by changing the movable supporting plate of ancillary coil position in orbit.Below the movable supporting plate of ancillary coil movable supporting plate wheel assembly is housed, can reduces the friction force between the movable supporting plate of ancillary coil and the track, convenient mobile ancillary coil.
The movable supporting plate of ancillary coil is provided with ancillary coil location bowl, and the field coil support is provided with field coil location bowl; Track, the movable supporting plate of ancillary coil, base plate, ancillary coil location bowl, field coil location bowl are the insulation nonferromagnetic material.Convince oilhole by patient analysis on the field coil support, be used for the coil heat radiation.
Field coil and ancillary coil are identical two the square coils of physical dimension, and winding mode is continous way.
Tested structural member internal stent is opened stopper slot, and tested structural member is positioned in the stopper slot, carries out spacing with cross-over block.
Distance between field coil and the ancillary coil is the twice of distance between field coil and the tested structural member; The breadth extreme of described tested structural member is greater than the field coil breadth extreme more than 1.5 times.
A kind of method of using above-mentioned measuring system that the loss of transformer device structure spare and temperature rise are measured, measure tested structural part loss: by two ancillary coil and field coils that structure is identical, the structure space magnetic field plane of symmetry, the Distribution of Magnetic Field at plane of symmetry place and the Distribution of Magnetic Field on structural member surface are similar to, measure the field coil loss with the method, use again field coil and tested structural member, measure total losses, by doing difference the field coil loss is separated with tested structural part loss, obtain tested structural part loss; Measure tested structural member temperature rise: fill with transformer oil in the fuel tank, the field coil temperature rise obtains by measuring thermal resistance, oil duct at tested structural member surface and fuel tank is provided with temperature probe, by the temperature probe on oil duct and tested structural member surface, measures tested structural member temperature rise.
Described measurement field coil loss: tested structural member is taken away, field coil and ancillary coil series connection, ancillary coil and the field coil symmetry that is parallel to each other, variable-frequency power sources is given in field coil and the ancillary coil simultaneously and is passed into equal-sized electric current, measure the electric current in the field coil, and the sensor probe that utilizes power analyzer gathers the voltage signal on the field coil, the loss of measuring field coil; Ancillary coil keeps identical with the field coil bind mode in the field coil loss measurement process, and guarantees in the whole test process that size of current is equal all the time in the field coil and ancillary coil.
Described measurement total losses: ancillary coil is removed from tested zone, only measured the total losses of field coil and tested structural member; Measure field coil and tested structural member total losses, the bind mode that keeps field coil in the measuring process and power frequency and amplitude are consistent during with the loss measurement of independent measurement field coil.
The invention has the beneficial effects as follows: the present invention utilizes balanced method to add the method for tested structural member total losses by measuring respectively field coil loss, field coil, the field coil loss is separated with tested structural part loss, obtain with transformer in the loss of tested structural member in the close situation of magnetic flux distribution, appropriate design test specimen insulating support makes it be convenient for measuring test specimen loss and temperature rise; Measuring system and method are finished the loss of transformer device structure spare simultaneously and temperature rise is measured simultaneously, and incorporation engineering is used, and are used for formulating product design scheme and verifying electromagnetic computing method.
Description of drawings
Fig. 1 is synoptic diagram behind the embodiment of the invention placement fuel tank;
Fig. 2 is that the embodiment of the invention is removed synoptic diagram behind the fuel tank;
Fig. 3 is embodiment of the invention field coil support schematic perspective view;
Fig. 4 is the movable supporting plate schematic perspective view of embodiment of the invention ancillary coil;
Fig. 5 is the tested structural member support of embodiment of the invention schematic perspective view;
Fig. 6 is that the embodiment of the invention is measured field coil losser circuit figure;
Fig. 7 is that the embodiment of the invention is measured total losses circuit intention;
Among the figure: 1, fuel tank; 2, field coil; 3, track; 4, base plate; 5, ancillary coil; 6, coil cushion block; 7, tested structural member; 8, field coil support; 9, coil brace feet; 10, oil guiding hole; 11, field coil location bowl; 12, ancillary coil location bowl; 13, movable supporting plate locating part; 14, movable supporting plate wheel assembly; 15, the movable supporting plate of ancillary coil; 16, tested structural member support; 17, power analyzer; 18, variable-frequency power sources.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described by embodiment.
The measuring system of a kind of transformer device structure spare loss and temperature rise, comprise base plate 4, fuel tank 1, power analyzer 17, variable-frequency power sources 18, field coil 2, ancillary coil 5 and tested structural member 7, field coil and ancillary coil are identical, power analyzer is connected on the field coil side, variable-frequency power sources is to field coil and ancillary coil power supply, and fuel tank, field coil, ancillary coil and tested structural member are arranged on the base plate; Oil duct at tested structural member surface and fuel tank is provided with temperature probe, by the temperature probe on oil duct and tested structural member surface, measures tested structural member temperature rise.
The present invention also is provided with the movable supporting plate 15 of field coil support 8, track 3, tested structural member support 16, coil cushion block 6 and ancillary coil, track 3 is set on the base plate 4, the fuel tank tested structural member support 16 of 1 interior parallel placement and field coil support 8, coil cushion block 6 is placed on the field coil support 8, the movable supporting plate of ancillary coil is placed on the track 3, tested structural member 7 is placed on the tested structural member support 16, field coil 2 is fixed on the field coil support 8, and ancillary coil 5 is placed on the movable supporting plate of ancillary coil.The position of ancillary coil 5 is adjusted by changing the position of the movable supporting plate 15 of ancillary coil on track 3.Below the movable supporting plate 15 of ancillary coil movable supporting plate wheel assembly 14 is housed, can reduces the friction force between the movable supporting plate 15 of ancillary coil and the track 3, convenient mobile ancillary coil 5.
The movable supporting plate of ancillary coil is provided with ancillary coil location bowl 12, and the field coil support is provided with field coil location bowl 11; Track 3, the movable supporting plate 15 of ancillary coil, base plate 4, ancillary coil location bowl 12, field coil location bowl 11 are the insulation nonferromagnetic material.Convince oilhole 10 on the field coil support 8 by patient analysis, be used for the coil heat radiation.
Stopper slot is opened in tested structural member support 16 inside, and tested structural member is positioned in the stopper slot, carries out spacing with cross-over block.
Distance between field coil 2 and the ancillary coil 5 is the twice of distance between field coil 2 and the tested structural member.The breadth extreme of described tested structural member is greater than the field coil breadth extreme more than 1.5 times.
A kind of method of using above-mentioned measuring system that the loss of transformer device structure spare and temperature rise are measured, measure tested structural part loss: by two ancillary coil and field coils that structure is identical, the structure space magnetic field plane of symmetry, the Distribution of Magnetic Field at plane of symmetry place and the Distribution of Magnetic Field on structural member surface are similar to, measure the field coil loss with the method, use again field coil and tested structural member, measure total losses, by doing difference the field coil loss is separated with tested structural part loss, obtain tested structural part loss; Measure tested structural member temperature rise: fill with transformer oil in the fuel tank, the field coil temperature rise obtains by measuring thermal resistance, oil duct at tested structural member surface and fuel tank is provided with temperature probe, by the temperature probe on oil duct and tested structural member surface, measures tested structural member temperature rise.
By variable-frequency power sources voltage, the field coil loss in measurement different frequency, the different current amplitude situation and the loss of tested structural member.Ancillary coil keeps identical with the field coil bind mode in the field coil loss measurement process, and guarantees in the whole test process that size of current is equal all the time in the field coil and ancillary coil.Measure field coil and tested structural member total losses, the bind mode that keeps field coil in the measuring process and power frequency and amplitude are consistent during with the loss measurement of independent measurement field coil.
Before the tested structural member temperature measurement, in fuel tank, fill with transformer oil, temperature probe is placed on tested structural member surface, in oil duct, place simultaneously temperature probe, after fuel tank internal reaches thermal equilibrium, record the temperature in tested structural member surface and the oil duct, calculate tested structural member surface temperature rise.
The concrete measuring method of embodiment is:
(1) at first carry out zero load and measure, namely only have field coil and ancillary coil in the metering circuit, the position of adjusting ancillary coil 5 makes its position with field coil be the Parallel Symmetric layout;
(2) frequency and the voltage magnitude of adjusting variable-frequency power sources, until the required current waveform of power analyzer display measurement, the active-power P of record field coil this moment
1
(3) remove ancillary coil, only keep field coil in the circuit, and tested structural member is positioned on the tested structural member support, regulate frequency and the voltage of variable-frequency power sources, until the current waveform that power analyzer shows is consistent with the waveform of demonstration in the step (2), the active-power P of record system's this moment
2
(4) loss of tested structural member is P=(P
2-P
1);
(5) frequency and the current amplitude of change variable-frequency power sources, repeating step (1) (2) (3) (4) obtains different frequency, the loss of tested structural member under the different current amplitude effects.
(6) after the loss of tested structural member has been surveyed, ancillary coil is moved on to outside the measured zone, temperature probe is placed in the oil duct of tested structural member surface and fuel tank, transformer oil will be filled with in the fuel tank, field coil is switched on, after each position reaches thermal equilibrium in fuel tank, record oil temperature in tested structural member surface temperature and the oil duct, calculate tested structural member temperature rise.
The described base plate wooden one-tenth of lamination; With the wooden one-tenth field coil of lamination support 8 and the movable supporting plate 15 of ancillary coil, place coil cushion block 6 on the field coil support; Installation activity supporting plate wheel assembly 14 below the movable supporting plate 15 of ancillary coil, and place it on the track 3; Field coil 2 and ancillary coil 5 are placed on respectively on field coil support 8 and the movable supporting plate 15 of ancillary coil, tested structural member 7 is placed on the tested structural member support 16.
Claims (9)
1. the measuring system of a transformer device structure spare loss and temperature rise, it is characterized in that: comprise base plate (4), fuel tank (1), power analyzer (17), variable-frequency power sources (18), field coil (2), ancillary coil (5) and tested structural member (7), field coil and ancillary coil are identical, power analyzer is connected on the field coil side, variable-frequency power sources is to field coil and ancillary coil power supply, and fuel tank, field coil, ancillary coil and tested structural member are arranged on the base plate; Oil duct at tested structural member surface and fuel tank is provided with temperature probe, by the temperature probe on oil duct and tested structural member surface, measures tested structural member temperature rise.
2. the measuring system of a kind of transformer device structure spare loss according to claim 1 and temperature rise, it is characterized in that: also be provided with field coil support (8), track (3), tested structural member support (16), the movable supporting plate (15) of coil cushion block (6) and ancillary coil, track (3) is set on the base plate (4), the tested structural member support of parallel placement (16) and field coil support (8) in the fuel tank (1), coil cushion block (6) is placed on the field coil support (8), the movable supporting plate of ancillary coil is placed on the track (3), tested structural member (7) is placed on the tested structural member support (16), field coil (2) is fixed on the field coil support (8), and ancillary coil (5) is placed on the movable supporting plate of ancillary coil; The position of ancillary coil (5) is adjusted by changing the position of the movable supporting plate (15) of ancillary coil on track (3).
3. the measuring system of a kind of transformer device structure spare loss according to claim 2 and temperature rise, it is characterized in that: below the movable supporting plate of ancillary coil (15) movable supporting plate wheel assembly (14) is housed, can reduce the friction force between the movable supporting plate (15) of ancillary coil and the track (3), convenient mobile ancillary coil (5).
4. the measuring system of a kind of transformer device structure spare loss according to claim 1 and 2 and temperature rise is characterized in that: the movable supporting plate of ancillary coil is provided with ancillary coil location bowl (12), and the field coil support is provided with field coil location bowl (11); Track (3), the movable supporting plate (15) of ancillary coil, base plate (4), ancillary coil location bowl (12), field coil location bowl (11) are the insulation nonferromagnetic material; Convince oilhole (10) on the field coil support (8) by patient analysis, be used for the coil heat radiation; Stopper slot is opened in tested structural member support (16) inside, and tested structural member is positioned in the stopper slot, carries out spacing with cross-over block.
5. the measuring system of a kind of transformer device structure spare loss according to claim 1 and 2 and temperature rise, it is characterized in that: field coil (2) and ancillary coil (5) are identical two the square coils of physical dimension, and winding mode is continous way.
6. the measuring system of a kind of transformer device structure spare loss according to claim 1 and 2 and temperature rise, it is characterized in that: the distance between field coil (2) and the ancillary coil (5) is the twice of distance between field coil (2) and the tested structural member; The breadth extreme of described tested structural member is greater than the field coil breadth extreme more than 1.5 times.
7. a right to use requires the method that 1 measuring system that limits is measured the loss of transformer device structure spare and temperature rise, it is characterized in that measuring tested structural part loss: by two ancillary coil and field coils that structure is identical, the structure space magnetic field plane of symmetry, the Distribution of Magnetic Field at plane of symmetry place and the Distribution of Magnetic Field on structural member surface are similar to, measure the field coil loss with the method, use again field coil and tested structural member, measure total losses, by doing difference the field coil loss is separated with tested structural part loss, obtain tested structural part loss; Measure tested structural member temperature rise: fill with transformer oil in the fuel tank, the field coil temperature rise obtains by measuring thermal resistance, oil duct at tested structural member surface and fuel tank is provided with temperature probe, by the temperature probe on oil duct and tested structural member surface, measures tested structural member temperature rise.
8. the measuring method of a kind of transformer device structure spare loss according to claim 7 and temperature rise, it is characterized in that: described measurement field coil loss: tested structural member is taken away, field coil and ancillary coil series connection, ancillary coil and the field coil symmetry that is parallel to each other, variable-frequency power sources is given in field coil and the ancillary coil simultaneously and is passed into equal-sized electric current, measure the electric current in the field coil, and the sensor probe that utilizes power analyzer gathers the voltage signal on the field coil, the loss of measuring field coil; Ancillary coil keeps identical with the field coil bind mode in the field coil loss measurement process, and guarantees in the whole test process that size of current is equal all the time in the field coil and ancillary coil.
9. it is characterized in that: described measurement total losses: ancillary coil is removed from tested zone, only measured the total losses of field coil and tested structural member according to claim 7 or the measuring method of 8 described a kind of transformer device structure spare losses and temperature rise; Measure field coil and tested structural member total losses, the bind mode that keeps field coil in the measuring process and power frequency and amplitude are consistent during with the loss measurement of independent measurement field coil.
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| CN2012105779215A CN103063930A (en) | 2012-12-27 | 2012-12-27 | Measuring system and measuring method for loss and temperature rise of transformer structural components |
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| CN2012105779215A CN103063930A (en) | 2012-12-27 | 2012-12-27 | Measuring system and measuring method for loss and temperature rise of transformer structural components |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2563331C1 (en) * | 2014-06-02 | 2015-09-20 | федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Южно-Российский государственный политехнический университет (НПИ) имени М.И. Платова" | Method of determination of losses in transformer and device for its implementation |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004301757A (en) * | 2003-03-31 | 2004-10-28 | Fumio Sumiyoshi | System for monitoring coil loss condition, and coil loss measuring method |
| KR100758149B1 (en) * | 2006-08-21 | 2007-09-12 | 순천향대학교 산학협력단 | Total loss measurement device of superconductor and moving equipment of the device |
| CN102253114A (en) * | 2010-12-30 | 2011-11-23 | 保定天威集团有限公司 | Magnetic flux leakage experimental facility for using mirror method |
| CN102262181A (en) * | 2011-07-15 | 2011-11-30 | 保定天威集团有限公司 | Method and device for measuring component stray loss based on leakage magnetic flux compensation |
| CN202189097U (en) * | 2011-07-15 | 2012-04-11 | 保定天威集团有限公司 | Structural member stray loss measuring device based on leakage magnetic flux compensation |
-
2012
- 2012-12-27 CN CN2012105779215A patent/CN103063930A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004301757A (en) * | 2003-03-31 | 2004-10-28 | Fumio Sumiyoshi | System for monitoring coil loss condition, and coil loss measuring method |
| KR100758149B1 (en) * | 2006-08-21 | 2007-09-12 | 순천향대학교 산학협력단 | Total loss measurement device of superconductor and moving equipment of the device |
| CN102253114A (en) * | 2010-12-30 | 2011-11-23 | 保定天威集团有限公司 | Magnetic flux leakage experimental facility for using mirror method |
| CN102262181A (en) * | 2011-07-15 | 2011-11-30 | 保定天威集团有限公司 | Method and device for measuring component stray loss based on leakage magnetic flux compensation |
| CN202189097U (en) * | 2011-07-15 | 2012-04-11 | 保定天威集团有限公司 | Structural member stray loss measuring device based on leakage magnetic flux compensation |
Non-Patent Citations (3)
| Title |
|---|
| 李岩 等: "电力变压器绕组短路强度、温升、电场计算与分析", 《变压器》 * |
| 郭晶 等: "电力变压器磁屏蔽模型损耗三维有限元分析及实验研究", 《黑龙江电力》 * |
| 郭晶 等: "电力变压器磁屏蔽模型涡流场和损耗的计算与测量", 《电力科学与工程》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2563331C1 (en) * | 2014-06-02 | 2015-09-20 | федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Южно-Российский государственный политехнический университет (НПИ) имени М.И. Платова" | Method of determination of losses in transformer and device for its implementation |
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Application publication date: 20130424 |