CN106405315B - A kind of motor stator winding fault detection method - Google Patents
A kind of motor stator winding fault detection method Download PDFInfo
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- CN106405315B CN106405315B CN201610729991.6A CN201610729991A CN106405315B CN 106405315 B CN106405315 B CN 106405315B CN 201610729991 A CN201610729991 A CN 201610729991A CN 106405315 B CN106405315 B CN 106405315B
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- 238000004804 winding Methods 0.000 title claims abstract description 79
- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 238000003466 welding Methods 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims description 11
- 230000008439 repair process Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 6
- 238000012545 processing Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000001931 thermography Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000001757 thermogravimetry curve Methods 0.000 description 1
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Classifications
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0096—Radiation pyrometry, e.g. infrared or optical thermometry for measuring wires, electrical contacts or electronic systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
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- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacture Of Motors, Generators (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of motor stator winding fault detection methods.It is powered to motor stator winding；While energization, stator winding is observed using infrared thermal imager, to obtain the Characteristics of The Distribution of Temperature of the thermal-induced imagery and entire stator winding that are observed stator winding；According to coil where fault pin or coil group compared with the temperature drift of remaining coil or the observed result of relatively low principle and acquisition, trouble location is analyzed and determined.The present invention is mainly to detect the recessive winding failure of motor stator winding three-phase dc resistance unbalance etc. because caused by being broken at coil welding point or is cracked；The method can efficiently, it is intuitive, accurate, nondestructively confirm fault pin position, the cost of electrical fault detection and processing can be greatly reduced.
Description
Technical field
The present invention relates to detection technique field, especially machine winding fault detections and maintenance field.
Background technique
Machine winding breaks down, such as three-phase resistance is uneven, is often as winding coil and conducting ring or on line
Between lead at have crackle or fracture caused by.In failure early stage, since outer layer insulation wraps up, it is intuitive accurate and nondestructively fixed to be difficult
Position fault pin.Common practice is lead to be cut, then by measurement D.C. resistance come by phase, by group, one by one go really
Determine fault pin position, but the subsequent reparation difficulty of way in this way is big, hidden danger is high.In many cases, done fault statistics and
After analysis, winding can integrally pull out report from a liner and give up, and waste high.
In the prior art, application No. is the Chinese invention patents of 201310727580.X to disclose a kind of double-fed wind generating
Machine stator winding unbalanced fault detection method, passes through the current sensor of double-fed wind power generator rotor side, voltage sensor
Rotor-side electric current, rotor-side voltage signal are measured respectively；If judgement reaches the sampling time, to collected voltage signal by line electricity
Pressure is converted into phase voltage；The electric current of every phase, voltage signal are multiplied to obtain the power signal of every phase；Resulting every phase power is believed
Number corresponding be added obtains total three phase power signal；Total three phase power signal carries out Fourier transformation, obtains rotor-side power
Spectrogram；Extract 2f in spectrogram1The amplitude at place is as characteristic value, f1For stator side power grid fundamental frequency；Judge under electrical fault state
Characteristic value whether be greater than 1.2-1.6 times of the characteristic value under motor unfaulty conditions, if more than fault alarm is then issued.Shen
Number a kind of Warm status monitoring method of generator of nuclear power station stator winding please be disclosed for a Chinese invention of 201210290203.X
And system, which comprises the leaving water temperature information for each stator bar that acquisition generator unit stator winding includes；According to acquisition
To the leaving water temperature information of stator bar generate the radar map for showing the leaving water temperature information of the stator bar；It shows
The radar map of the leaving water temperature for showing stator bar of the generation.The above prior art not can solve the prior art and deposit
Motor stator winding fault detection accuracy is low, low efficiency, damages to winding and big, subsequent repairs difficult technical problem.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of motor stator winding fault detection methods, can solve
Detection accuracy certainly of the existing technology is low, low efficiency, damages big, the subsequent technical problem for repairing difficulty to winding.
The technical scheme is that a kind of motor stator winding fault detection method, is powered to motor stator winding；It is logical
While electric, stator winding is observed using infrared thermal imager, to obtain the infrared chart for being observed stator winding
The Characteristics of The Distribution of Temperature of picture and entire stator winding；It is more inclined than the temperature of other coils according to coil where fault pin or coil group
The observed result of high or relatively low principle and acquisition, analyzes and determines trouble location.
When being powered to motor stator winding, 4 times when electric current is empty load of motor or it is greater than 4 times and less than 6 times.
Intuitively stator winding is observed using the temperature field film viewing screen of infrared thermal imager and records entire stator
The Characteristics of The Distribution of Temperature of winding.
The thermal-induced imagery includes the thermal-induced imagery for being observed stator winding lead pad and corresponding coil.
The stator winding faults are recessive winding failure, and the recessiveness winding failure is motor stator winding because coil draws
Wire bonding joint fracture or cracked and appearance it is without exception caused by three-phase dc resistance unbalance.
The motor is phase asynchronous traction motor；The motor stator winding fault detection method includes as follows
Step:
A: motor stator winding is powered according to normal use mode, and electrical current is more than or equal to 4 times no-load tests
Electric current；
B: while energization, stator winding is observed in real time with infrared thermal imager, obtains the infrared of stator winding
Thermal image observes the temperature change at each position of stator winding；
C: under 4 times of no-load test electric currents or the locked rotor test function of current, coil-end where stator winding lead pad
The thermal-induced imagery in portion gradually distinguishes high temperature and low temperature position；The degree of unbalancedness of motor stator three-phase dc resistance is bigger, instead
The temperature difference reflected on thermal-induced imagery is bigger；
D: recording the Characteristics of The Distribution of Temperature of entire stator winding, according to coil where fault pin or the more other lines of coil group
The observational record of the temperature drift of circle or relatively low principle and acquisition as a result, analysis and determine fault pin, it is inclined to find out temperature
High or relatively low pad and corresponding coil；
E: marking on temperature drift or relatively low pad and corresponding coil, so as to it is subsequent will be exhausted at the pad
Edge is removed, and repair welding or other repairs are carried out.
In step A, electrical current size is more than or equal to 4 times and less than 6 times no-load test electric currents, conduction time do not surpass
Spend 1 minute.
The present invention is mainly to detect motor stator winding because of fracture at coil welding point or cracked (appearance is no different
The recessiveness winding failure of three-phase dc resistance unbalance etc. caused by often), can be used for other similar situation；The method can be high
It imitates, is intuitive, is accurate, nondestructively confirming fault pin position, the cost that electrical fault detection can be greatly reduced and handled.Using
The present invention is able to solve low detection accuracy of the existing technology, low efficiency, damages big, the subsequent skill for repairing difficulty to winding
Art problem can especially lead crackle or fracture defect early stage occurring, intuitive accurate and nondestructively positioning failure lead, significantly
It reduces subsequent reparation difficulty and reduces hidden danger, practicability is extremely strong.
Detailed description of the invention
Fig. 1 is the motor stator winding pad schematic diagram in the present invention；
Text and letter in figure, number combination (W2 is upper, under U2, V4 is upper, under W4, U6 is upper, under V6, W8 is upper, under U8, V10
Under upper, W10, U12 is upper, under V12, in 1, in 3, in 5, in 7, in 9 and in 11) be corresponding pad code name, pad with
Black dot indicates.W, V, U are motor three-phase windings and lead-out wire code name, and main generation refers to W, V, U corresponding time herein
Lu Huan, i.e. outmost three large circles (innermost annulus is neutral ring, with " in " indicate), all welding being attached thereto
The code name initial of point is corresponding ring code name.Number represents pad position (corresponding clock number) in clock plane.
Spatial position of the coil in core slots, i.e. upper coil and inner coil where "up" and "down" represents pad, can be default.
Neutral ring pad includes two pads in figure 7 as in, and actually the two pads are welded to together, in kind outer
Be also a pad in sight, therefore in 7 this code names indicate, other neutral ring pads (in 1, in 3, in 5, in 9,
In representation method 11) it is 7 identical in.One complete pad is by ring code name addend word ("upper", "lower" can usually omit)
Indicate, such as on U6() pad, refer to U ring in 6 o'clock direction (upper layer sideline circle) pad.
Specific embodiment
A kind of motor stator winding fault detection method is powered (4 times when electric current is about unloaded) to motor stator winding,
According to coil where fault pin or coil group compared with the temperature anomaly of remaining coil (it is usually higher, lead be broken completely after because
No current by for temperature it is relatively low), intuitively, fast observed and recorded entire using the temperature field film viewing screen of infrared thermal imager
The Characteristics of The Distribution of Temperature of winding, and then fault pin is analyzed and determined.
Thermal infrared imager is the infrared energy point for receiving measured target using infrared detector and optical imaging objective
The reflection of cloth figure is on the light-sensitive element of infrared detector, to obtain Infrared Thermogram, this thermography and body surface
Heat distribution field is corresponding.That is: thermal infrared imager is exactly that the invisible infrared energy that object issues is changed into visible thermal image.
The different colours of the upper surface of thermal image represent the different temperatures of testee.
The present invention is described further in the following with reference to the drawings and specific embodiments.
Referring to FIG. 1, the distribution of motor stator winding pad is as shown in stain in figure, pad (i.e. lead pad) is
The intersection point of lead and annulus.By taking a kind of phase asynchronous traction motor as an example, when its three-phase D.C. resistance degree of unbalancedness is super
Cross the 2% of its average value, and when appearance can not determine abort situation, fault location can be carried out according to the following steps: by motor stator around
Group is powered according to normal use mode, while observing the temperature change at each position of winding in real time with infrared thermal imager.In 4 times of skies
Carry under test current or the locked rotor test function of current (current parameters can be adjusted voluntarily, but not exceed 6 times of no-load test electric currents,
And conduction time was no more than 1 minute), the thermal-induced imagery of end turn can be distinguished gradually where stator winding lead pad
High/low temperature position out.It is normal with the temperature of stator winding lead pad and place coil under without failure normal conditions
Temperature, being higher by the normal temperature is high temperature (i.e. temperature drift), is low temperature lower than the normal temperature (i.e. temperature is relatively low).Motor is fixed
The degree of unbalancedness of sub- three-phase dc resistance is bigger, and the temperature difference being reflected on thermal-induced imagery is bigger.In the weldering of temperature anomaly
It is marked on contact and corresponding coil, it is subsequent to be removed insulating at the pad, carry out repair welding or other repairs.
Compared with prior art, when there is above-mentioned failure (three-phase dc resistance unbalance), the prior art is common to be done
Method be cut lead, then by measurement D.C. resistance come by phase, by group, one by one go determine fault pin position, with reference to Fig. 1
It is found that, according to the way of the above prior art, subsequent reparation difficulty is big, hidden since pad is numerous and distribution situation is complicated
Suffer from height, in many cases, after having done fault statistics and analysis, stator winding can integrally pull out report from a liner and give up, and waste high.And it uses
Cause due to the present invention is broken detecting motor stator winding at coil welding point or cracked especially appearance is without exception
The recessive winding failure such as three-phase dc resistance unbalance, do not need to cut lead, do not need yet by measurement D.C. resistance come
By phase, by group, one by one go determine fault pin position, but by give stator winding electrifying while use infrared thermal imaging
Instrument obtains thermal-induced imagery, and analysis determines fault pin position in turn, can it is intuitive, accurate, efficiently, nondestructively confirmation therefore
Hinder wire locations, is able to solve low detection accuracy of the existing technology, low efficiency, big, subsequent reparation difficulty is damaged to winding
The technical issues of, especially in lead crackle or fracture defect early stage, can intuitively accurate and nondestructively positioning failure lead, significantly
It reduces subsequent reparation difficulty and reduces hidden danger, prevent stator winding from integrally pulling out the appearance of the useless phenomenon of report from a liner, avoid wasting, drop significantly
The cost of low machine winding trouble shoot and processing.The present invention takes by using the above-mentioned technical solution different from the prior art
Obtained the technical effect for being much better than the prior art.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., is all included in the scope of protection of the present invention.
Claims (1)
1. a kind of motor stator winding fault detection method, characterized in that be powered to motor stator winding；While energization, adopt
Stator winding is observed with infrared thermal imager, to obtain the thermal-induced imagery and entire stator for being observed stator winding
The Characteristics of The Distribution of Temperature of winding；According to the temperature drift of coil or coil group than other coils where fault pin or relatively low original
Reason and the observed result obtained, analyze and determine trouble location；
When being powered to motor stator winding, 4 times when electric current is empty load of motor or it is greater than 4 times and less than 6 times；
Intuitively stator winding is observed using the temperature field film viewing screen of infrared thermal imager and records entire stator winding
Characteristics of The Distribution of Temperature；
The thermal-induced imagery includes the thermal-induced imagery for being observed stator winding lead pad and corresponding coil；
The stator winding faults are recessive winding failure, and the recessiveness winding failure is motor stator winding because coil lead welds
Connect joint fracture or cracked and appearance it is without exception caused by three-phase dc resistance unbalance；
The motor is phase asynchronous traction motor；The motor stator winding fault detection method includes following step
It is rapid:
A: motor stator winding is powered according to normal use mode, and electrical current is more than or equal to 4 times no-load test electric currents；
B: while energization, stator winding is observed in real time with infrared thermal imager, obtains the infrared chart of stator winding
Picture observes the temperature change at each position of stator winding；
C: under 4 times of no-load test electric currents or the locked rotor test function of current, end turn where stator winding lead pad
Thermal-induced imagery gradually distinguishes high temperature and low temperature position；The degree of unbalancedness of motor stator three-phase dc resistance is bigger, is reflected in
Temperature difference on thermal-induced imagery is bigger；
D: recording the Characteristics of The Distribution of Temperature of entire stator winding, according to coil where fault pin or the more other coils of coil group
The observational record of temperature drift or relatively low principle and acquisition as a result, analysis and determine fault pin, find out temperature drift or
Relatively low pad and corresponding coil；
E: it is marked on temperature drift or relatively low pad and corresponding coil, so that subsequent will insulate at the pad is torn open
It removes, carries out repair welding or other repairs；
In step A, electrical current size is more than or equal to 4 times and less than 6 times no-load test electric currents, conduction time are no more than 1
Minute.
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| CN106405315B true CN106405315B (en) | 2019-02-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107037305A (en) * | 2017-03-15 | 2017-08-11 | 江苏大学 | A kind of bearing-free motor suspending windings fault detection method |
| CN109391075A (en) * | 2017-08-10 | 2019-02-26 | 广东核电合营有限公司 | A kind of nuclear power plant's generator outlet warehouse and its temperature monitoring method |
| CN108712135A (en) * | 2018-08-24 | 2018-10-26 | 海盐新跃电器有限公司 | A kind of anti-dieback protection circuit of pressure table motor |
| CN110531258A (en) * | 2019-07-15 | 2019-12-03 | 乌江渡发电厂 | The fault detection method of stator coil in a kind of power plants generating electricity unit |
| CN111922547A (en) * | 2020-07-27 | 2020-11-13 | 苏州索尔达动力科技有限公司 | System and method for detecting and evaluating welding quality of flat copper wire stator welding end |
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| CN1759325A (en) * | 2003-03-12 | 2006-04-12 | 西门子公司 | Laminated core testing device |
| CN101750148A (en) * | 2009-12-31 | 2010-06-23 | 贵阳新光电气有限公司 | On-line monitoring and positioning method for temperature of junction plates of pole coil of rotor of electric generator |
| CN102608528A (en) * | 2011-12-01 | 2012-07-25 | 华南理工大学 | Defect detection method and device for motors |
| CN103018277A (en) * | 2011-09-22 | 2013-04-03 | 通用汽车环球科技运作有限责任公司 | Non-destructive evaluation of welded joints of bar wound stator utilizing infrared and thermal methods |
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- 2016-08-26 CN CN201610729991.6A patent/CN106405315B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1759325A (en) * | 2003-03-12 | 2006-04-12 | 西门子公司 | Laminated core testing device |
| CN101750148A (en) * | 2009-12-31 | 2010-06-23 | 贵阳新光电气有限公司 | On-line monitoring and positioning method for temperature of junction plates of pole coil of rotor of electric generator |
| CN103018277A (en) * | 2011-09-22 | 2013-04-03 | 通用汽车环球科技运作有限责任公司 | Non-destructive evaluation of welded joints of bar wound stator utilizing infrared and thermal methods |
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