CN111896893A - Method and device for simulating winding deformation defect in transformer - Google Patents
Method and device for simulating winding deformation defect in transformer Download PDFInfo
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- CN111896893A CN111896893A CN202010494706.3A CN202010494706A CN111896893A CN 111896893 A CN111896893 A CN 111896893A CN 202010494706 A CN202010494706 A CN 202010494706A CN 111896893 A CN111896893 A CN 111896893A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
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Abstract
The application provides a method and a device for simulating winding deformation defects in a transformer, and belongs to the field of state sensing of power transmission and transformation equipment. The method comprises the following steps: normally winding high-voltage windings of a first phase, a second phase and a third phase of the transformer; a plurality of tapping taps are arranged on the low-voltage winding of the third phase, each tapping tap is led out through a sleeve respectively, and switching is arranged among the tapping taps; setting displacement defects for the windings of the second phase; setting bulge defects on the first-phase low-voltage winding, and setting a plurality of tapping taps, wherein each tapping is led out through a sleeve; and observing the state of each winding in the transformer. Through the comparison arrangement of the windings, the comparison observation between the defective winding and the normal winding is facilitated. The defects of the transformer winding are simulated by arranging the displacement defects on the winding set, and quantitative control of the defect state can be realized. The real structural characteristics of the transformer are simulated by testing the defective winding, and the authenticity and the accuracy of the test data are obtained.
Description
Technical Field
The invention belongs to the field of state sensing of power transmission and transformation equipment, and particularly relates to a method and a device for simulating winding deformation defects in a 110KV full-size transformer.
Background
The power transformer is a key core device of a power system, the national grid system is huge, the device loading amount is huge, and the operation reliability of the power transformer is directly related to the power supply safety of the power system. However, in recent years, the transformer winding deformation fault is frequent and is located at the first fault of the transformer, in 2006-2015, the damage faults of 220kV and above transformers in national grid systems caused by winding deformation reach 81 times, and account for 33.8% of all the faults of the transformer. Frequent transformer winding deformation fault has led to the worry of very big equipment reliability, especially along with electric power system scale is bigger and bigger, and the capacity is higher and higher, and system short circuit current level promotes year by year, and transformer winding deformation fault hidden danger is more outstanding, and behind the system short circuit, how to detect out the transformer fast effectively and whether take place the winding and warp, avoid transformer fault damage, have become the problem of the key concern of operation and maintenance unit, need to solve urgently.
The existing transformer winding deformation defect simulation test system can be wholly divided into three types:
the first type is to design an RLC two-port circuit with a specific frequency band filtering function so as to embody the distributed frequency response characteristic of the transformer winding. The method has the defects that the distributed effect of the electrical structure of the transformer winding cannot be reflected, and an effective test loop cannot be provided for deep problems such as a signal propagation mechanism, a sensor coupling mechanism and the like involved in the offline detection or online monitoring of the winding deformation by the frequency response method.
And the second type is that a metal structural part is arranged at a proper position of a real transformer winding to form a simple model, the control of the space capacitance and inductance parameters of the winding is realized through the change of the parameters of the metal structural part, and the change of the space capacitance and inductance replaces the actual change of a mechanical structure. The method has the disadvantages that the influence of structures such as an iron core, a clamping piece, a ferrite, an oil paper insulation and the like on signal propagation during propagation in the actual transformer winding cannot be reflected, and the rationality of simulating the mechanical deformation state of the winding only through electrical parameters such as capacitance, inductance and the like is low.
The third category is to simulate winding deformation defects in small transformers such as distribution transformers. The method has the disadvantages that the mechanical structures of the small transformer and the large power transformer of 66kV or above are obviously different, and the frequency response characteristics and the electrical parameters of the small transformer and the large power transformer are also obviously different, so that the characteristics of the power transformer of 66kV or above cannot be reflected by test data obtained in a small transformer model. The practical application is mostly for large power transformers of 66kV and above, so the applicability of such models is low.
Disclosure of Invention
Accordingly, the present invention is directed to a method and apparatus for simulating winding deformation defects in a transformer, which solves or overcomes at least one of the problems of the prior art.
In a first aspect, the present application provides a method of simulating a winding deformation defect in a transformer, comprising:
preparing to normally wind high-voltage windings of a first phase, a second phase and a third phase of a transformer;
arranging a plurality of tapping taps on the low-voltage winding of the third phase, leading out each tapping tap section through a sleeve respectively, and arranging switching among the tapping taps;
setting a displacement defect for the winding of the second phase;
setting bulge defects on the first-phase low-voltage winding, and setting a plurality of tapping taps, wherein each tapping is led out through the sleeve;
and observing the state of each winding in the transformer.
Preferably, 4 of the tap-offs are provided for the third phase, and the 4 tap-offs are evenly provided on the low-voltage winding of the third phase.
Preferably, the displacement defect provided to the low voltage winding of the second phase comprises:
and performing horizontal displacement defect and vertical displacement defect on the low-voltage winding of the second phase.
Preferably, the first and second electrodes are formed of a metal,
setting a first displacement range in a horizontal direction of the low-voltage winding of the second phase;
a second displacement range is provided for the high voltage winding of the second phase in its vertical direction.
Preferably, the first displacement range is ± 20 mm.
Preferably, the second displacement range is ± 10 mm.
Preferably, four tapping taps are led out of the first-phase low-voltage winding, and each tapping tap is uniformly distributed.
Preferably, the method for setting the bulge defect for the first-phase low-voltage winding is as follows:
a plum-blossom-shaped bulge deformation is arranged between a first tap and a second tap of the first-phase low-voltage winding, and the radial bulge deformation height range is +/-10 mm;
circumferential bulge deformation is arranged between a second tap and a third tap of the first-phase low-voltage winding, and the axial bulge deformation height range is +/-10 mm;
and normal winding is carried out between a third tap and a fourth tap of the first-phase low-voltage winding.
Preferably, each phase winding is arranged in a bell jar type oil tank and is filled with oil, and the distance between the oil level in the oil tank and the oil tank cover is less than or equal to 100 mm.
Preferably, the method of observing the state of each winding in the transformer is:
and visually observing the state of each winding in the transformer through a visual window preset at each corresponding position and/or a camera device arranged at each corresponding position.
In a second aspect, there is provided an apparatus for simulating a winding deformation defect in a transformer, comprising:
the high-voltage winding assembly is used for normally winding high-voltage windings of a first phase, a second phase and a third phase of the transformer;
a horizontal displacement assembly for setting a first displacement range in a horizontal direction of the low voltage winding of the second phase;
a vertical displacement assembly for setting a second displacement range in a vertical direction of the high-voltage winding of the second phase;
and the bulge setting assembly is used for setting bulge defects on the low-voltage winding of the third phase, and is provided with a plurality of tapping taps, and each tapping is led out through the sleeve.
The application has the following beneficial effects:
according to the method and the device for simulating the winding deformation defect in the transformer, the windings of the first phase, the second phase and the third phase are arranged, and comparison and observation between the defective winding and the normal winding are facilitated by performing comparison and arrangement on the windings. And the defects of the transformer winding are simulated by setting displacement defects on the winding set, and quantitative control of the defect state can be realized. The real structural characteristics of the transformer are simulated by testing the defective winding, and the authenticity and the accuracy of the obtained test data are obtained.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a simplified flowchart of a method for simulating winding deformation defects in a transformer according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an apparatus for simulating a winding deformation defect in a transformer according to an embodiment of the present invention.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
In a first aspect, the present application provides a method of simulating a winding deformation defect in a transformer, comprising: normally winding high-voltage windings of a first phase, a second phase and a third phase of a transformer (namely, conventionally winding); arranging a plurality of tapping taps on the low-voltage winding of the third phase, leading out each tapping tap section through a sleeve respectively, and arranging switching among the tapping taps; setting a displacement defect for the winding of the second phase; setting bulge defects on the first-phase low-voltage winding, and setting a plurality of tapping taps, wherein each tapping is led out through the sleeve; and electrifying the transformer, and observing the state of each winding in the transformer.
In this embodiment, the design parameters are as follows, for a transformer of 110 kV: 110. + -. 2.5%/10.5 or 6.062kV (3 phase 50Hz), connection group: YNd11 or YNyn0, short circuit impedance: 10.5% (based on 17000 kVA).
In this embodiment, 4 tap points are provided for the third phase, and the 4 tap points are uniformly provided on the low-voltage winding of the third phase. The low-voltage coil is provided with N turns, a C1 tap is led out from the head end, a C2 tap is led out from the N/4 position, a C3 tap is led out from the N/2 position, and a C4 tap is led out from the tail end. The third main column winding is tightened axially by using a polyester tape, and the winding is reliably pressed and braced on the clamping piece. And 4 tap taps are arranged on the third phase and used as comparison terms of the first phase.
And in the first phase, four tapping points are led out of the first-phase low-voltage winding, and each tapping point is uniformly distributed. The four tap-offs in the first phase are distributed identically to the four tap-offs in the third phase, with the same parameters as the third phase setup, i.e. with the same number of turns and the same segmentation.
Specifically, the method for setting the bulge defect for the first-phase low-voltage winding includes: a plum-blossom-shaped bulge deformation is arranged between a first tap and a second tap of the first-phase low-voltage winding, and the radial bulge deformation height range is +/-10 mm; circumferential bulge deformation is arranged between a second tap and a third tap of the first-phase low-voltage winding, and the axial bulge deformation height range is +/-10 mm; and normal winding is carried out between a third tap and a fourth tap of the first-phase low-voltage winding.
As one skilled in the art will appreciate, the deformation defect is set in the first-phase low-voltage winding, and the gap is properly adjusted in the corresponding high-voltage winding position area so as to observe the bulging deformation of the first-phase low-voltage winding.
In this embodiment, the displacement defect provided to the low voltage winding of the second phase includes: and performing horizontal displacement defect and vertical displacement defect on the low-voltage winding of the second phase.
And setting a first displacement range in the horizontal direction of the low-voltage winding of the second phase, wherein the first displacement range is +/-20 mm. By providing the slide rail below the low voltage winding of the second phase, the second column is enabled to move in the horizontal direction along the slide rail.
And setting a second displacement range for the high-voltage winding of the second phase in the vertical direction of the high-voltage winding, wherein the second displacement range is +/-10 mm. When the high-voltage winding is firstly installed, the second-phase high-voltage winding is arranged at a height position of-10 mm, and is fixed at a position of 0mm by arranging a lever, and the second-phase high-voltage winding can be vertically displaced between-10 mm and 10mm by the lever.
In the embodiment, each phase winding is arranged in the bell jar type oil tank, oil is filled in the oil tank, and the distance between the liquid level of the oil in the oil tank and the oil tank cover is less than or equal to 100mm, so that good heat dissipation and insulation effects are ensured. The arranged bell-jar type oil tank is convenient to open and is beneficial to defect arrangement of various windings.
In this embodiment, the method for observing the state of each winding in the transformer is as follows: and visually observing the state of each winding in the transformer through a visual window which is preset at the corresponding position of each phase and/or a camera device which is arranged at the corresponding position of each phase on the oil tank.
In a second aspect, referring to fig. 2, there is provided an apparatus for simulating a winding deformation defect in a transformer, comprising: the high-voltage winding assembly is used for normally winding high-voltage windings of a first phase, a second phase and a third phase of the transformer; a horizontal displacement assembly for setting a first displacement range in a horizontal direction of the low voltage winding of the second phase; a vertical displacement assembly for setting a second displacement range in a vertical direction of the high-voltage winding of the second phase; and the bulge setting assembly is used for setting bulge defects on the low-voltage winding of the third phase, and is provided with a plurality of tapping taps, and each tapping is led out through the sleeve.
The high-voltage winding of each phase is normally wound, and the high-voltage winding and the low-voltage winding are arranged in a comparison mode. The low-voltage winding of the second phase is passed through a horizontal displacement assembly arranged in a horizontal direction below the low-voltage winding, the horizontal displacement assembly comprises a horizontal sliding rail, so that the low-voltage winding can move in the horizontal direction along the sliding rail, and it is understood that the initial position of the low-voltage winding of the second phase is arranged in the middle of the horizontal sliding rail, thereby realizing the defect of a first displacement range in the horizontal direction of the low-voltage winding of the second phase.
And a vertical moving assembly is arranged below the high-voltage winding of the second phase and comprises a lever and a vertical sliding rail, and one end of the lever is arranged in the vertical sliding rail and can be rotatably connected to the high-voltage winding of the second phase. It should be understood that the initial position of the second phase high voltage winding is set at the middle position of the vertical slide rail, so that the high voltage winding can slide up and down in the vertical slide rail, thereby realizing the defect of setting the second displacement range of the second phase high voltage winding in the vertical direction.
According to the method and the device for simulating the winding deformation defect in the transformer, the windings of the first phase, the second phase and the third phase are arranged, and comparison and observation between the defective winding and the normal winding are facilitated by performing comparison and arrangement on the windings. And the defects of the transformer winding are simulated by setting displacement defects on the winding set, and quantitative control of the defect state can be realized. The real structural characteristics of the transformer are simulated by testing the defective winding, and the authenticity and the accuracy of the obtained test data are obtained.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. A method of simulating winding deformation defects in a transformer, comprising:
normally winding high-voltage windings of a first phase, a second phase and a third phase of the transformer;
arranging a plurality of tapping taps on the low-voltage winding of the third phase, leading out each tapping tap section through a sleeve respectively, and arranging switching among the tapping taps;
setting a displacement defect for the winding of the second phase;
and arranging bulge defects on the first-phase low-voltage winding, and arranging a plurality of tapping taps, wherein each tapping is led out through the sleeve.
2. The method for simulating winding deformation defect in transformer according to claim 1, wherein 4 said tap taps are provided for said third phase, and 4 said tap taps are uniformly provided on the low voltage winding of said third phase.
3. The method of claim 1, wherein the displacement defect provided to the low voltage winding of the second phase comprises:
and performing horizontal displacement defect and vertical displacement defect on the low-voltage winding of the second phase.
4. Method for simulating winding deformation defects in a transformer according to claim 3,
making a horizontal displacement defect on the low-voltage winding of the second phase comprises setting a first displacement range on the low-voltage winding of the second phase in the horizontal direction;
the defect of vertical displacement of the high-voltage winding of the second phase comprises setting a second displacement range of the high-voltage winding of the second phase in the vertical direction of the high-voltage winding.
5. The method for simulating winding deformation defects in a transformer according to claim 4, wherein the first displacement range is ± 20 mm;
the second displacement range is ± 10 mm.
6. The method for simulating winding deformation defect in transformer according to claim 1, wherein four tap taps are led out from the first-phase low-voltage winding, and each tap is uniformly distributed.
7. The method of simulating a winding distortion defect in a transformer of claim 6 wherein placing a bulge defect on the first phase low voltage winding comprises:
a plum-blossom-shaped bulge deformation is arranged between a first tap and a second tap of the first-phase low-voltage winding, and the radial bulge deformation height range is +/-10 mm;
circumferential bulge deformation is arranged between a second tap and a third tap of the first-phase low-voltage winding, and the axial bulge deformation height range is +/-10 mm;
and normal winding is carried out between a third tap and a fourth tap of the first-phase low-voltage winding.
8. The method for simulating winding deformation defects in a transformer according to claim 1, wherein each phase winding is disposed in a bell jar type tank and filled with oil, and the distance between the oil level in the tank and the tank cap is 100mm or less.
9. The method for simulating winding deformation defects in a transformer according to claim 1, further comprising:
and visually observing the state of each winding in the transformer through a visual window which is preset at the corresponding position of each phase and/or a camera device which is arranged at each corresponding position.
10. An apparatus for simulating winding deformation defects in a transformer, comprising:
the high-voltage winding assembly is used for normally winding high-voltage windings of a first phase, a second phase and a third phase of the transformer;
a horizontal displacement assembly for setting a first displacement range in a horizontal direction of the low voltage winding of the second phase;
a vertical displacement assembly for setting a second displacement range in a vertical direction of the high-voltage winding of the second phase;
and the bulge setting assembly is used for setting bulge defects on the low-voltage winding of the third phase, and is provided with a plurality of tapping taps, and each tapping is led out through a sleeve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010494706.3A CN111896893A (en) | 2020-06-03 | 2020-06-03 | Method and device for simulating winding deformation defect in transformer |
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| CN202010494706.3A CN111896893A (en) | 2020-06-03 | 2020-06-03 | Method and device for simulating winding deformation defect in transformer |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201336208Y (en) * | 2008-12-15 | 2009-10-28 | 保定天威集团有限公司 | Tap outlet line structure of transformer high-voltage coil |
| US20120130663A1 (en) * | 2009-07-23 | 2012-05-24 | Indian Institute Of Technology, Bombay | On-line diagnostic method for health monitoring of a transformer |
| CN103884946A (en) * | 2014-04-04 | 2014-06-25 | 国家电网公司 | Transformer fault simulating device |
| CN206271524U (en) * | 2016-12-19 | 2017-06-20 | 华城电机（武汉）有限公司 | Distribution transformer high-tension coil tapping structure |
| CN107015077A (en) * | 2017-02-23 | 2017-08-04 | 广西电网有限责任公司电力科学研究院 | A kind of deformation of transformer winding analogue means |
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2020
- 2020-06-03 CN CN202010494706.3A patent/CN111896893A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201336208Y (en) * | 2008-12-15 | 2009-10-28 | 保定天威集团有限公司 | Tap outlet line structure of transformer high-voltage coil |
| US20120130663A1 (en) * | 2009-07-23 | 2012-05-24 | Indian Institute Of Technology, Bombay | On-line diagnostic method for health monitoring of a transformer |
| CN103884946A (en) * | 2014-04-04 | 2014-06-25 | 国家电网公司 | Transformer fault simulating device |
| CN206271524U (en) * | 2016-12-19 | 2017-06-20 | 华城电机（武汉）有限公司 | Distribution transformer high-tension coil tapping structure |
| CN107015077A (en) * | 2017-02-23 | 2017-08-04 | 广西电网有限责任公司电力科学研究院 | A kind of deformation of transformer winding analogue means |
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Application publication date: 20201106 |