CN102592806A - Amorphous alloy dry-type transformer coil insulating structure and method of removing local discharge signal noise - Google Patents

Amorphous alloy dry-type transformer coil insulating structure and method of removing local discharge signal noise Download PDF

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Publication number
CN102592806A
CN102592806A CN2011104335443A CN201110433544A CN102592806A CN 102592806 A CN102592806 A CN 102592806A CN 2011104335443 A CN2011104335443 A CN 2011104335443A CN 201110433544 A CN201110433544 A CN 201110433544A CN 102592806 A CN102592806 A CN 102592806A
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CN
China
Prior art keywords
coil
discharge signal
local discharge
insulation
noise
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CN2011104335443A
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Chinese (zh)
Inventor
李�杰
徐锡舟
印德林
洪振兴
廖志凌
赵晓明
夏方明
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江苏宏安变压器有限公司
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Priority to CN2011104335443A priority Critical patent/CN102592806A/en
Publication of CN102592806A publication Critical patent/CN102592806A/en

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Abstract

The invention discloses an amorphous alloy dry-type transformer coil insulating structure and a method of removing local discharge signal noise. The amorphous alloy dry-type transformer coil insulating structure comprises a coil end (1), coil segments, a coil winding (3) and an outer coil part (5), and the amorphous alloy dry-type transformer coil insulating structure is characterized in that the coil end (1) is a rectangular end ring with beautiful outline and strong mechanical strength; the coil segments are isolated by dovetail cushion blocks, so that the space is enough to facilitate the heat dissipation and complete impregnation of impregnating varnish; and the coil winding (3) is wound in a rectangular cylindrical structure, the outer coil part (5) is subjected to bundling, vacuum pressure drying, varnish impregnating and curing processes so as to guarantee uniform field intensity distribution and strong anti-short circuit capability. In the local discharge monitoring process, a sensor collects a discharge signal and sends the discharge signal to a noise analyzer, and the noise analyzer separates the periodical narrow-band interference and white noise in the noise; and compensation signals with equal compensation size and opposite polarities are compensated, a real local discharge signal can be obtained, and a technician can accurately judge the insulating problem of the amorphous alloy dry-type transformer.

Description

Non-crystaline amorphous metal is done modified line circle insulation system and is removed local discharge signal noise method

Technical field

The present invention relates to power transformer manufacturing and built-in electrical insulation monitoring technology, concretely, is a kind of coil insulation structure of amorphous alloy dry-type transformer and the method for removing noise in the local discharge signal.

Background technology

At present, in amorphous alloy transformer, coil is wound in round shape; Cause the volume of transformer big, cost is high, and the number of turn of the coil winding of each layer is all identical, both has been unfavorable for heat radiation; Be unfavorable for that again insulating varnish soaks into, simultaneously, end winding adopts traditional angle end insulation more; Profile looks not attractive in appearance, can not satisfy enough mechanical strengths.When monitoring transformer inside partial discharge,, when monitoring, tend to run into various interference, disturb and white noise like periodic narrow because the operational outfit site environment is complicated.The sensitivity and the reliability of the influence monitoring of these serious interference.Therefore, the elimination of interference and inhibition are the key issues of partial discharge monitoring.

Summary of the invention

The present invention be directed to the deficiency of prior art, provide a kind of novel H level partly to seal three pillar amorphous alloy dry-type transformer coil insulation systems, make volume of transformer little; Good looking appearance; Can satisfy enough mechanical strengths, the coil inside thermal diffusivity is good, and it is strong that insulating varnish soaks into ability; The core interior field intensity evenly distributes, and anti-short circuit capability is strong.Based on the method for Fourier analysis and small echo variation, remove noise in the monitoring local discharge signal, to calculate simply, eliminating is disturbed, and makes analysis result more accurate.

The present invention is achieved through subordinate's technical scheme: adopt a kind of H level partly to seal the coil insulation structure of three pillar amorphous alloy dry-type transformers, it comprises end winding, between coil segment; Coil windings; Coil is outside, it is characterized in that: described end winding adopts the rectangular end circle, separates with the dovetail cushion block between coil segment; Coil windings adopts the coiling of rectangle cylinder mode, and coil is outside to be handled through wrapping-vacuum pressure oven dry-dipping lacquer-curing process.In addition; During the monitoring local discharge signal,, give SONOAN through being installed in two sensor acquisition discharge signals on the insulation winding; Periodic narrow through analyzer is isolated in the noise is disturbed and white noise; As long as adding equal and opposite in direction, opposite polarity compensating signal are offset, the signal that deliver in the main frame this moment is exactly a local discharge signal, and the technical staff can be to judge the Insulation Problems place of transformer exactly.

Described end winding adopts the end coil structures-rectangular end circle of similar SGB10 product, and the end places the stepped end insulation.

Described dovetail cushion block evenly distributes along circumference eight equal portions, and its height and the coil width of cloth are to consistent size.

Described coil windings adopts four-part form to distribute, and every section each interlayer coil turn is arranged according to pyramid, and layer asks that it is the two film Du Ponts of H level paper lenticular wires that NOMEX paper, electromagnetic wire are used in insulation.

Described coil encapsulating adopts four sections integral body to seal, and seals with a polyester-imide plate earlier, wraps up two-layer with H grade high-strength, exotic material half lap again.

Removal local discharge signal noise method of the present invention comprises data acquisition, data processing and data analysis, and described method comprises step:

Data acquisition step through light communication, optic fiber converter converts the detected partial discharge acoustic signals of built-in sensors into the signal of telecommunication and host computer carries out exchanges data, is stored in the process in the host computer ACCESS database;

Data in the top database are done Fourier analysis with data processing step operational analysis appearance and wavelet transformation obtains periodic narrow interference and white noise, through compensator compensates equal and opposite in direction, opposite polarity signal, just obtains the local discharge signal of wanting again;

The physical attribute of data analysis step local discharge signal is presented on the main frame, and the technical staff can find the in-problem position of insulation through analysis software.

The invention has the beneficial effects as follows: end winding has adopted square coil, makes good looking appearance, can satisfy enough mechanical strengths again; Separate with the dovetail cushion block between coil segment, both guaranteed intersegmental distance, guaranteed intersegmental enough spaces of leaving again; Help heat radiation and impregnating varnish to soak into fully, coil windings is with the circular configuration coiling, and this just makes field strength distribution even; The coil external coil through oven dry-dipping lacquer-curing process, has possessed anti-short circuit capability preferably again after wrapping.Adopt Fourier analysis and wavelet transformation to carry out denoising, process is calculated simply, method is ripe, and denoising effect is better, makes analysis result more accurate sooner.

Description of drawings

Fig. 1 longitudinal sectional view of the present invention;

Fig. 2 vertical view of the present invention;

Fig. 3 partial discharge denoising flow chart

Wherein: the insulation of (1) square coil (2) insulation bucket (3) winding (4) dovetail cushion block (5) external reinforcing.

Embodiment

Introduce as follows the present invention is concrete below in conjunction with accompanying drawing:

A kind of transformer coil insulation system as shown in Figure 1 comprises rectangular end circle, insulating cylinder, coil windings, external reinforcing insulation, and wherein the rectangular end circle adopts the end coil structures of similar SGB10 product, and good looking appearance can satisfy enough mechanical strengths again.

Coil windings adopts four cylindrical section formula structure coilings, every section each interlayer coil turn down payment word turriform rule coiling, from inside to outside coil turn by close to rare;

Separate insulation with NOMEX paper between every layer of the coil, electromagnetic wire adopts the two film Du Ponts of H level paper lenticular wire;

External reinforcing insulation is to seal four sections integral body, i.e. polyester-imide plate of bag earlier externally is two-layer with H grade high-strength, the wrapping of exotic material half lap again, again through vacuum pressure oven dry-dipping lacquer-curing process processing, has solved the problem of anti-short circuit capability difference basically.

The dovetail cushion block of plug-in mounting between each section coil as shown in Figure 2 being spaced from each other between coil segment, helps heat radiation and impregnating varnish to soak into fully;

The described dovetail cushion block height and the coil width of cloth are evenly placed 8 dovetail cushion blocks to consistent size between every section.

Also do and further describe removing local discharge signal noise method, described method may further comprise the steps:

Data acquisition step through light communication, optic fiber converter converts the detected partial discharge acoustic signals of built-in sensors into the signal of telecommunication and host computer carries out exchanges data, is stored in the process in the host computer ACCESS database;

Top data are done Fourier analysis with data processing step operational analysis appearance and wavelet transformation obtains periodic narrow interference and white noise, and signal compensator compensation equal and opposite in direction, opposite polarity signal just obtain the local discharge signal of wanting again;

The physical attribute of data analysis step local discharge signal is presented on the main frame, and the technical staff can find the problem of insulation existence through analysis software.

Described built-in sensors is connected with transformer insulated winding through signal input channel.

Described built-in sensors is connected with optic fiber converter through the RS232 serial communication protocol, and optic fiber converter is connected with host computer through the optical fiber communication bus.

Described Fourier analysis is handled, and is that the interference signals waveform that is mixed with that collects is carried out FFT, finds a series of centre frequency ω of narrow band interference i, choose suitable fourier coefficient, disturb thereby obtain periodic narrow.

Described wavelet transform process is that the interference signal that collects is carried out wavelet package transforms, selects a minimum basic function as wavelet transformation of entropy, thereby obtains best classification performance, provides best signal transformation.

Described analytic process, be the data conversion storage after handling in the INSQL real-time data base, adopt INSQL database analysis software that data are handled, analyzed, the problem place of final decision partial discharge, and then take the modification measure.

The technical staff in present technique field should be realized that; Above embodiment is used for explaining patent of the present invention; And be not to serve as qualification of the present invention; So long as in the essence of an invention spirit, to the variation of the above embodiment, distortion all drops in the scope of claims of the present invention.

Claims (9)

1. non-crystaline amorphous metal disclosed by the invention is done modified line circle insulation system and is removed local discharge signal noise method, and it comprises end winding, between coil segment; Coil windings; Coil is outside, it is characterized in that: described end winding adopts the rectangular end circle, separates with the dovetail cushion block between coil segment; Coil windings adopts the coiling of rectangle cylinder mode, and coil is outside to be handled through wrapping-vacuum pressure oven dry-dipping lacquer-curing process.When the monitoring local discharge signal; Through being installed in two sensor acquisition discharge signals on the insulation winding; Pass through amplifier-analyzer again, disturb and white noise, as long as add equal and opposite in direction, opposite polarity compensating signal is offset through the periodic narrow that analyzer is isolated in the noise; The signal that deliver in the main frame this moment is exactly a local discharge signal, and the technical staff can be to judge the Insulation Problems place of transformer exactly.
2. non-crystaline amorphous metal according to claim 1 is done modified line circle insulation system and is removed local discharge signal noise method, and it is characterized in that: end winding adopts the end coil structures-rectangular end circle of similar SGB10 product, and the end places the stepped end insulation.
3. non-crystaline amorphous metal according to claim 1 is done modified line circle insulation system and is removed local discharge signal noise method, and it is characterized in that: used dovetail cushion block evenly distributes along circumference eight equal portions, and its height and the coil width of cloth are to consistent size.
4. non-crystaline amorphous metal according to claim 1 is done modified line circle insulation system and is removed local discharge signal noise method; It is characterized in that: described coil windings adopts four-part form to distribute; Every section each interlayer coil turn is arranged according to pyramid; Layer insulation is used NOMEX paper, and electromagnetic wire is the two film Du Ponts of H level paper lenticular wires.
5. non-crystaline amorphous metal according to claim 1 is done modified line circle insulation system and is removed local discharge signal noise method; It is characterized in that: described coil encapsulating adopts four sections integral body to seal; Seal with a polyester-imide utmost point earlier, wrap up two-layer with H grade high-strength, exotic material half lap again.
6. non-crystaline amorphous metal according to claim 1 is done modified line circle insulation system and is removed local discharge signal noise method; Described built-in sensors is connected with optic fiber converter through the RS232 serial communication protocol, and optic fiber converter is connected with host computer through the optical fiber communication bus.
7. non-crystaline amorphous metal according to claim 1 is done modified line circle insulation system and is removed local discharge signal noise method; Described Fourier analysis is handled; Be that the interference signals waveform that is mixed with that collects is carried out FFT; Find a series of centre frequency ω i of narrow band interference, obtain fourier coefficient, disturb thereby obtain periodic narrow.
8. non-crystaline amorphous metal according to claim 1 is done modified line circle insulation system and is removed local discharge signal noise method; Described wavelet transform process; Be that the interference signal that collects is carried out wavelet package transforms; Select a minimum basic function of entropy, thereby obtain best classification performance, provide best signal transformation as wavelet transformation.
9. non-crystaline amorphous metal according to claim 1 is done modified line circle insulation system and is removed local discharge signal noise method; Described analytic process; Be the data conversion storage after handling in the INSQL real-time data base; Adopt INSQL database analysis software that data are handled, analyzed the problem of final decision partial discharge.
CN2011104335443A 2011-12-22 2011-12-22 Amorphous alloy dry-type transformer coil insulating structure and method of removing local discharge signal noise CN102592806A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102945741A (en) * 2012-11-19 2013-02-27 江苏宏安变压器有限公司 Three-phase three-pole H-class open type SGB10 amorphous alloy transformer
CN107329067A (en) * 2017-06-16 2017-11-07 中国南方电网有限责任公司超高压输电公司检修试验中心 A kind of circuit for eliminating 12 pulsation interference

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JPS60165707A (en) * 1984-02-08 1985-08-28 Toshiba Corp Transformer for ac-dc conversion
CN1787134A (en) * 2005-12-13 2006-06-14 中电电气集团有限公司 Tech. for impregnating varnish of half packed 10KV grade high voltage coil
CN201117408Y (en) * 2007-07-27 2008-09-17 中电电气集团有限公司 High low-voltage winding rectangular coil
CN101847505A (en) * 2010-05-28 2010-09-29 常州联力变压器有限公司 Dry type transformer and manufacturing method thereof
CN101949744A (en) * 2010-09-06 2011-01-19 国网电力科学研究院武汉南瑞有限责任公司 Fiber grating-based transformer internal temperature detection system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60165707A (en) * 1984-02-08 1985-08-28 Toshiba Corp Transformer for ac-dc conversion
CN1787134A (en) * 2005-12-13 2006-06-14 中电电气集团有限公司 Tech. for impregnating varnish of half packed 10KV grade high voltage coil
CN201117408Y (en) * 2007-07-27 2008-09-17 中电电气集团有限公司 High low-voltage winding rectangular coil
CN101847505A (en) * 2010-05-28 2010-09-29 常州联力变压器有限公司 Dry type transformer and manufacturing method thereof
CN101949744A (en) * 2010-09-06 2011-01-19 国网电力科学研究院武汉南瑞有限责任公司 Fiber grating-based transformer internal temperature detection system

Non-Patent Citations (1)

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Title
杨洋: "基于小波分析的变压器局部放电数字化抗干扰方法研究", 《基于小波分析的变压器局部放电数字化抗干扰方法研究 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102945741A (en) * 2012-11-19 2013-02-27 江苏宏安变压器有限公司 Three-phase three-pole H-class open type SGB10 amorphous alloy transformer
CN102945741B (en) * 2012-11-19 2016-08-10 江苏宏安变压器有限公司 A kind of three-phase three-column H level open type SGB10 type amorphous alloy transformer
CN107329067A (en) * 2017-06-16 2017-11-07 中国南方电网有限责任公司超高压输电公司检修试验中心 A kind of circuit for eliminating 12 pulsation interference

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Application publication date: 20120718