CN101509897B - Dry transformer coil defect detecting method - Google Patents
Dry transformer coil defect detecting method Download PDFInfo
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- CN101509897B CN101509897B CN2009100302208A CN200910030220A CN101509897B CN 101509897 B CN101509897 B CN 101509897B CN 2009100302208 A CN2009100302208 A CN 2009100302208A CN 200910030220 A CN200910030220 A CN 200910030220A CN 101509897 B CN101509897 B CN 101509897B
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Abstract
The invention discloses a detection method of dry-typed transformer coil-defect which is capable of effectively detecting the defects in dry-typed transformer coils. The detection method is realized by the following technical proposal of: firstly cleaning the inner and the outer surfaces of the transformer coil, and then fixing the transformer coil on a clamping frame which can do positive and negative rotary motions; coating engine oil or syrup on two floating-type ultrasonic probes as well as between the inner and the outer surfaces of the coil to be detected as coupling agent; then leadingthe transformer coil to do positive and negative rotary motions for less than 360 degrees at the uniform rotation speed of 60-80 circles per minute, and simultaneously leading the two floating-type ultrasonic probes to do walking scanning motions on the inner and the outer surfaces of the coil along the axial direction of the coil at the speed of 0.4-0.6 meters per minute; simultaneously, recording the defective waveform by an ultrasonic instrument at any time, and analyzing to obtain the defect sizes and the positions thereof; and wiping all the exposed surfaces of the coil clean after the completion of the detection.
Description
Technical field
The present invention relates to a kind of dry transformer coil defect detecting method, that is to say, a kind of detection method of effective practicality is provided for the detection of high pressure dry transformer coil defect.
Background technology
The making of high pressure dry transformer coil is general to be adopted traditional coiling and pours epoxy resin technology, be wrapped with one deck epoxy resin layer in the coil copper wire layer, easily form two class defectives during cast in this layer: one is loose for cast, reason is because liquid-state epoxy resin can not get abundant feeding in the cooled and solidified contraction process, and forms imperceptible irregular dispersion or intensive hole; Another kind of is the junction of epoxy resin and transformer coil copper wire layer inside and outside wall, easily forms the incomplete fusion defective that is similar to welding.Because transformer when work temperature is higher, recovers normal temperature when not working again, the defective heat affecting meeting of frequently catching a cold develops into fatigue crack, easily causes infiltration or makes moist, and then influence the insulating property of coil, thereby make the transformer inefficacy, causes accident.Thereby, should in time carry out defects detection to coil, avoiding and to repair such defective, and have not yet to see the method that the high pressure dry transformer coil defect is detected, therefore, need provide effectively and the method that practical dry transformer coil defect detects.
Summary of the invention
The detection method that the purpose of this invention is to provide a kind of dry transformer coil defect utilizes this method can detect defective in the dry-type transformer coil effectively.The present invention is achieved by following technical proposals: at first will be fixed on the holding frame that can do positive and negative gyration after the transformer coil surfaces externally and internally cleaning; Between two floating type ultrasonic probes and tested coil surfaces externally and internally, coat machine oil or syrup then as couplant; When making transformer coil do less than 360 ° of positive and negative at the uniform velocity gyrations afterwards with the velocity of rotation of per minute 60～80 circle, two floating type ultrasonic probes in coil outside surface upper edge coil axes to doing traveling scanning campaign with the speed of 0.4～0.6 meter of per minute; Meanwhile, ultrasonic instrument recording defect waveform and can analyze and learn defect size and place, position at any time; After detection finishes with all exposed surface wiped clean of coil.The uniform speed rotation of above-mentioned transformer coil, ultrasonic probe in coil on the outside surface simultaneously along the axial traveling scanning campaign of coil, and the collection of detection signal all adopts industrial computer control, can realize automation mechanized operation.
Description of drawings
Accompanying drawing 1 is a principle of work synoptic diagram of the present invention.
Embodiment
Below by accompanying drawing and example, be described further as follows to concrete characterization processes step of the present invention and process conditions:
1) coil surface cleaning.According to the characteristics requirement of transformer coil, adopt gauze with coil exposed surface wiped clean in all.
2) transformer coil 5 is fixedly installed in holding frame 1, starts power supply, make the scroll chuck 2 of holding frame clamp coil 5 automatically, this moment, coil 5 should keep horizontal level; Because coil is heavier, its end clamps the back coil other end and still has the trend that has a down dip, for making coil 5 levels, can be provided with a pair of support roller 6, two support rollers can rise (position sensor is controlled its upward movement) automatically until contacting and hold coil, support roller 6 is a floating structure, otherwise the location can take place.Coil also can adopt the upright position to detect;
3) adopt the short focal length probe of twin crystal of upper frequency as inside and outside circle ultrasonic probe 4,3, before the detection, should scribble couplant between two probes and the tested coil surface, consider the recovery of couplant and not response environment factor such as pollute, preferably syrup is made couplant;
4) beginning is worked automatically, carries out two motions: first coil holding frame 1 drives transformer coil 5 and does the uniform speed rotation, and velocity of rotation is per minute 60～80 circles; Because outlet shoulder 8 is arranged on the coil, interfere with outer ring ultrasonic probe 3 when preventing to rotate, thereby rotation only is the rotating less than 360 °; Its two be two ultrasonic probes 4,3 in coil on the outside surface simultaneously along the axial traveling scanning campaign of coil, the speed of travel is per minute (0.4～0.6) rice (this motion can drive ball-screw by stepper motor 7 and provide), ultrasonic instrument this moment recording defect waveform at any time is again to defective waveform analysis just defect size and place particular location as can be known.Owing to form relative helical motion between two probes and the coil surfaces externally and internally, can make pops one's head in finishes scanning to the whole surface of coil inside and outside circle side face.Above-mentioned two probes adopt floating structure, and during with the assurance probe scanning and coil inside and outside wall surface keeps excellent contact.
5) detection finishes, with all exposed surface wiped clean of coil.
The uniform speed rotation of above-mentioned transformer coil, ultrasonic probe in coil on the outside surface simultaneously along the axial traveling scanning campaign of coil, and the collection of detection signal all adopts industrial computer control, can realize automation mechanized operation.This detection method principle of work is simple, and the preparation structure is uncomplicated, simple to operate, easy to maintenance, has than extensive market prospects.This method also can be used for the detection of concrete product defective.
Claims (2)
1. a dry transformer coil defect detecting method is characterized in that, it comprises the following steps: to be fixed on the holding frame that can do positive and negative gyration after (1) is with transformer coil surfaces externally and internally cleaning; (2) between two ultrasonic probes and tested coil surfaces externally and internally, coat machine oil or syrup as couplant; (3) transformer coil is done less than 360 ° of rotatings at the uniform velocity gyration the time with the velocity of rotation of per minute 60～80 circle, two ultrasonic probes in coil outside surface upper edge coil axes to do walking scanning campaign with the translational speed of 0.4～0.6 meter of per minute; Meanwhile, ultrasonic instrument recording defect waveform and can analyze and learn defect size and place, position at any time; (4) detect finish after with all exposed surface wiped clean of coil.
2. according to the described dry transformer coil defect detecting method of claim 1, it is characterized in that two ultrasonic probes adopt floating structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100302208A CN101509897B (en) | 2009-03-23 | 2009-03-23 | Dry transformer coil defect detecting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100302208A CN101509897B (en) | 2009-03-23 | 2009-03-23 | Dry transformer coil defect detecting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101509897A CN101509897A (en) | 2009-08-19 |
| CN101509897B true CN101509897B (en) | 2011-02-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100302208A Active CN101509897B (en) | 2009-03-23 | 2009-03-23 | Dry transformer coil defect detecting method |
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| Country | Link |
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| CN (1) | CN101509897B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109506847A (en) * | 2017-09-15 | 2019-03-22 | 国网安徽省电力公司濉溪县供电公司 | Transformer-cabinet ultrasonic wave automatic leak-checking device |
| CN109100426B (en) * | 2018-07-13 | 2021-08-10 | 贵州绿源天鑫系统技术有限公司 | Preparation method of ultrasonic transverse wave coupling agent |
| CN110514739B (en) * | 2019-08-28 | 2022-05-10 | 山东国勘工程检测鉴定有限公司 | Reciprocating nondestructive testing device |
| CN112466662B (en) * | 2020-11-02 | 2022-07-12 | 丽水正阳电力建设有限公司 | Automatic production equipment for transformer winding of power system |
| CN114858755B (en) * | 2022-07-05 | 2022-10-21 | 中国航发四川燃气涡轮研究院 | Aero-engine coating frequency conversion in-situ laser detection system |
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2009
- 2009-03-23 CN CN2009100302208A patent/CN101509897B/en active Active
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| CN101509897A (en) | 2009-08-19 |
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