CN109188184A - The lookup method of big resistive short point between a kind of stock of transformer coil conducting wire - Google Patents
The lookup method of big resistive short point between a kind of stock of transformer coil conducting wire Download PDFInfo
- Publication number
- CN109188184A CN109188184A CN201810825467.8A CN201810825467A CN109188184A CN 109188184 A CN109188184 A CN 109188184A CN 201810825467 A CN201810825467 A CN 201810825467A CN 109188184 A CN109188184 A CN 109188184A
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- stock
- short
- coil
- short dot
- conducting wire
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The present invention relates to the lookup methods of resistive short point big between a kind of stock of transformer coil conducting wire, remove coil surface fender；Two conducting wires for suspecting the coil that stock-price forecast occurs are measured with 500V megohm meter, and the insulating layer of two conducting wire one end is stripped into 50mm long；It connects pressure regulator power supply and increases voltage to 15 volts, whether observation voltmeter has discharging sound with the presence or absence of indicator shake, coil inside；Short dot is determined with thermal imaging system scanning coil surface；It finds short dot back brace to burst at the seams cake, strips the wire insulation of short dot, short dot is polishing to sand paper smooth, mend packet wire insulation；With when resistance value infinity, illustrating that big resistive short point is handled successfully between the stock of winding wire between the stock of each conducting wire of 500V megohm meter repetition measurement.The present invention can rapidly and accurately determine the position of short dot according to temperature difference, avoid a wide range of lookup secondary loss and the construction delay caused by coil in aimless ground；Implement simple and convenient, economic cost is lower.
Description
Technical field
The invention belongs to power transformer manufactures and maintenance technology field, and in particular to a kind of stock of transformer coil conducting wire
Between big resistive short point lookup method, be particularly suitable for converter power transformer, super extra-high-voltage alternating current transformer.
Background technique
High voltage, large capacity are the trend of power transformer development, higher and higher to the quality requirement of transformer.Large size becomes
Depressor especially converter power transformer and super extra-high-voltage alternating current transformer, in order to reduce added losses and improve operational reliability, no
Allow to there is a situation where short circuit between coil stock.But in coil manufacturing process, conducting wire because bending, compressive deformation situations such as, hold
Easily cause stock-price forecast.Position good for short-circuit point contact can determine the position of short dot by measurement resistance and calculating
It sets and is targetedly handled；For even up to a hundred ohm of short dot of tens of Ohms, since the resistance of short dot is far longer than
The resistance of conducting wire can not judge short dot by the method for measurement resistance and calculating, often occur because aimless ground is a wide range of
It searches short dot and has seriously damaged the total quality of coil, or even coil is caused to scrap, cause biggish duration loss, matter
Amount loss and economic loss.
Summary of the invention
In order to solve the above technical problems, the present invention utilizes Ohm's law basic principle, big electricity there is stock to winding wire
Two conducting wires of resistance short circuit apply tens of amperes of electric current, since the resistance of short dot is greater than conductor resistance, the temperature of short dot
Can be higher than normal position, coil surface is scanned with thermal imaging system, short dot can be determined rapidly according to temperature difference
Position avoids searching secondary loss and construction delay caused by coil on a large scale.The technical solution adopted in the present invention is as follows:
The lookup method of big resistive short point between a kind of stock of transformer coil conducting wire, comprising the following steps:
Step 1, the fender for removing the covering of transformer coil surface；
Step 2 measures two conducting wires for suspecting the transformer coil that stock-price forecast occurs with 500V megohm meter, if measured
Resistance value be greater than 50 Ω, less than 1000 Ω, then belong to big resistive short between stock, by two conducting wires one of resistive short big between stock
The insulating layer at end strips 50mm long；
Otherwise 9 are gone to step, then according to the lookup of conventional ohmer algorithm progress short dot；
Pressure regulator with section is 2.5mm by step 32Copper modeling line be connected between stock on two conducting wires of big resistive short, connect
Logical pressure regulator power supply, rotation adjusting pressuring handle increase voltage to 15 volts；
In step 4, boost process pay attention to observation regulator output voltage table with the presence or absence of indicator shake, coil inside whether
There is discharging sound；
If indicator shake has discharging sound to illustrate that apparent electrothermal reaction occurs in short dot, it is young with thermal imaging system to go to step 5
Examining is looked into；Otherwise 6 continuation are gone to step and slowly improve voltage；
Coil surface is scanned in the position away from 1.5 meters to 2 meters of coil with thermal imaging system in step 5, boost process,
The position for being more than 1 DEG C with the circumferential wire cake temperature difference is marked, and by thermal imaging system move to the position away from 0.3 meter of coil surface into
The primary confirmation of row, if with the circumferential wire cake temperature difference still above 1 DEG C, it is determined that be short dot at this and go to step 7；
Step 6, according to 1 volt/6 seconds speed, voltage is further improved into 5 volts of ranges and goes to step 4 until find short circuit
Point；
Step 7 finds short dot back brace and bursts at the seams cake, strips the wire insulation of short dot position, to short dot sand paper into
Row is polishing to smooth, recovery line cake after benefit packet wire insulation；
It is step 8, big between the stock of winding wire with when resistance value infinity, illustrating between the stock of each conducting wire of 500V megohm meter repetition measurement
Resistive short point is handled successfully；
Otherwise 7 are gone to step and is further processed short dot；
Step 9, transformer coil conducting wire stock between the lookup process of big resistive short point terminate.
Preferably, voltage-stablizer described in step 3 is the TDGC2-2 manual voltage regulator of Shanghai regulator factory.
Preferably, thermal imaging system described in step 4 is the Ti32 thermal imaging system of fluke brand.
Beneficial effects of the present invention:
1) present invention can rapidly and accurately determine the position of short dot according to temperature difference, effectively prevent aimless
Secondary loss and construction delay caused by coil are searched on a large scale in ground.
2) present invention is implemented simple and convenient, and economic cost is lower.
Detailed description of the invention
Fig. 1 is logical procedure diagram of the invention.
Specific embodiment
With reference to the accompanying drawing, embodiments of the present invention are illustrated.
As shown in Figure 1, being logical procedure diagram of the invention.Big resistive short point between a kind of stock of transformer coil conducting wire
Lookup method, comprising the following steps:
Step 1, the fender for removing the covering of transformer coil surface.
Step 2 measures two conducting wires for suspecting the transformer coil that stock-price forecast occurs with 500V megohm meter, if measured
Resistance value be greater than 50 Ω, less than 1000 Ω, then belong to big resistive short between stock, by two conducting wires one of resistive short big between stock
The insulating layer at end strips 50mm long；
Otherwise 9 are gone to step and then is positioned according to conventional ohmer algorithm.
Pressure regulator with section is 2.5mm by step 3, the TDGC2-2 manual voltage regulator using Shanghai regulator factory2Copper
Modeling line is connected between stock on two conducting wires of resistive short greatly, connects pressure regulator power supply, and rotation adjusting pressuring handle increases voltage to 15 volts.
In step 4, boost process pay attention to observation regulator output voltage table with the presence or absence of indicator shake, coil inside whether
Have " " discharging sound；The purpose of above-mentioned observation is to confirm whether electrothermal reaction occur in short dot position, if indicator is trembled
It moves, there is discharging sound to illustrate that apparent electrothermal reaction occurs in short dot, executable step 5 is gone through with thermal imaging system, if do not had
There is indicator shake, then go to step without discharging sound 6 and slowly improve voltage.
Step 5, the Ti32 thermal imaging system using fluke brand, in boost process with thermal imaging system at 1.5 meters away from coil extremely
2 meters of position is scanned coil surface, and the position for being more than 1 DEG C with the circumferential wire cake temperature difference is marked, and by thermal imaging
Instrument moves to the position away from 0.3 meter of coil surface and is once confirmed, such as with the circumferential wire cake temperature difference still above 2 DEG C, it is determined that at this
For short dot and go to step 7.
Step 6, according to 1 volt/6 seconds speed, voltage is further improved into 5 volts of ranges and goes to step 4 until find short circuit
Point.
Step 7 finds short dot back brace and bursts at the seams cake, strips the wire insulation of short dot position, to short dot sand paper into
Row is polishing to smooth, recovery line cake after benefit packet wire insulation.
It is step 8, big between the stock of winding wire with when resistance value infinity, illustrating between the stock of each conducting wire of 500V megohm meter repetition measurement
Resistive short point is handled successfully；Otherwise 7 are gone to step and is further processed short dot.
Step 9, transformer coil conducting wire stock between the lookup process of big resistive short point terminate.
Claims (3)
1. the lookup method of big resistive short point between a kind of stock of transformer coil conducting wire, which comprises the following steps:
Step 1, the fender for removing the covering of transformer coil surface；
Step 2 measures two conducting wires for suspecting the transformer coil that stock-price forecast occurs with 500V megohm meter, if the electricity measured
Resistance value is greater than 50 Ω, less than 1000 Ω, then belongs to big resistive short between stock, by two conducting wire one end of resistive short big between stock
Insulating layer strips 50mm long；
Otherwise 9 are gone to step, then according to the lookup of conventional ohmer algorithm progress short dot；
The copper modeling line that pressure regulator is 2.5mm2 with section is connected between stock on two conducting wires of resistive short greatly by step 3, is connected and is adjusted
Depressor power supply, rotation adjusting pressuring handle increase voltage to 15 volts；
Notice whether observation regulator output voltage table is put with the presence or absence of indicator shake, coil inside in step 4, boost process
Electroacoustic；
If indicator shake has discharging sound to illustrate that apparent electrothermal reaction occurs in short dot, goes to step 5 and carefully examined with thermal imaging system
It looks into；Otherwise 6 continuation are gone to step and slowly improve voltage；
Coil surface is scanned in the position away from 1.5 meters to 2 meters of coil with thermal imaging system in step 5, boost process, to
The circumferential wire cake temperature difference is more than that 1 DEG C of position is marked, and thermal imaging system is moved to the position away from 0.3 meter of coil surface and carries out one
Secondary confirmation, if with the circumferential wire cake temperature difference still above 1 DEG C, it is determined that be short dot at this and go to step 7；
Step 6, according to 1 volt/6 seconds speed, voltage is further improved into 5 volts of ranges and goes to step 4 until find short dot；
Step 7 finds short dot back brace and bursts at the seams cake, strips the wire insulation of short dot position, is beaten with sand paper short dot
It is milled to smooth, recovery line cake after benefit packet wire insulation；
Step 8, with when resistance value infinity, illustrating big resistance between the stock of winding wire between the stock of each conducting wire of 500V megohm meter repetition measurement
Short dot is handled successfully；
Otherwise 7 are gone to step and is further processed short dot；
Step 9, transformer coil conducting wire stock between the lookup process of big resistive short point terminate.
2. the lookup method of big resistive short point between a kind of stock of transformer coil conducting wire according to claim 1, special
Sign is that voltage-stablizer described in step 3 is the TDGC2-2 manual voltage regulator of Shanghai regulator factory.
3. the lookup method of big resistive short point between a kind of stock of transformer coil conducting wire according to claim 1, special
Sign is that thermal imaging system described in step 5 is the Ti32 thermal imaging system of fluke brand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810825467.8A CN109188184A (en) | 2018-07-25 | 2018-07-25 | The lookup method of big resistive short point between a kind of stock of transformer coil conducting wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810825467.8A CN109188184A (en) | 2018-07-25 | 2018-07-25 | The lookup method of big resistive short point between a kind of stock of transformer coil conducting wire |
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| CN109188184A true CN109188184A (en) | 2019-01-11 |
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| CN201810825467.8A Pending CN109188184A (en) | 2018-07-25 | 2018-07-25 | The lookup method of big resistive short point between a kind of stock of transformer coil conducting wire |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114242442A (en) * | 2021-11-09 | 2022-03-25 | 天威保变（秦皇岛）变压器有限公司 | Inter-strand short circuit fault repairing method for self-adhesive combined lead coil of large power transformer |
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| CN106546893A (en) * | 2016-12-08 | 2017-03-29 | 温英权 | Detection method to inter-turn insulation defect |
| CN106646318A (en) * | 2017-02-28 | 2017-05-10 | 国网河南省电力公司电力科学研究院 | Dry-type hollow reactor turn-to-turn test device performance checking system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114242442A (en) * | 2021-11-09 | 2022-03-25 | 天威保变（秦皇岛）变压器有限公司 | Inter-strand short circuit fault repairing method for self-adhesive combined lead coil of large power transformer |
| CN114242442B (en) * | 2021-11-09 | 2023-08-15 | 天威保变（秦皇岛）变压器有限公司 | Inter-strand short circuit fault repairing method for self-adhesive combined wire coil of transformer |
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Application publication date: 20190111 |
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| RJ01 | Rejection of invention patent application after publication |