CN100406883C - Technological process for ultrasonic flaw detection of post insulator and porcelain bushing - Google Patents
Technological process for ultrasonic flaw detection of post insulator and porcelain bushing Download PDFInfo
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- CN100406883C CN100406883C CN200410014777XA CN200410014777A CN100406883C CN 100406883 C CN100406883 C CN 100406883C CN 200410014777X A CN200410014777X A CN 200410014777XA CN 200410014777 A CN200410014777 A CN 200410014777A CN 100406883 C CN100406883 C CN 100406883C
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
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Abstract
The present invention relates to a technology and a method of ultrasonic flaw detection of post insulators and ceramic sleeves used in power plants and transformer substations. In the method of the present invention, a special probe for the ultrasonic flaw detection of post insulators and ceramic sleeves is designed, the probe is communicated with a display screen of an instrument, and the fit sliding detection between the probe and the detected object is realized; no damage exists in the detected object when a unimodal bottom wave of the detected object is displayed on the display screen, and the detected object can be continuously used; damage exists in the detected object when a bimodal or a multimodal bottom wave of the detected object is displayed on the display screen, and the detected object can not be used and can be replaced rapidly. A backward method of manual detection after power failure can be changed by the technological method of the present invention, the flaw detection of the post insulators and ceramic sleeves can be carried out with electricity, hidden danger of internal cracks in porcelain can be effectively discovered in time, and accident is eliminated in advance. The technological method of the present invention is a breakthrough of condition maintenance, and a measure for effectively preventing power failure, etc. of lightning arresters, post insulators, etc. of power plants and transformer stations is provided.
Description
Technical field
A kind of support insulator and the insulator that the present invention relates to the use of generating plant and transformer station overlap technology and method with one of UT (Ultrasonic Testing).
Background technology
At present, support insulator and insulator are the important composition equipment of generating plant and substation operation, it plays a part support wire and insulation, because the mechanical load in the long-time running, and the influence of rugged surroundings such as strong wind precipitation, can make support insulator and insulator exist defective hidden danger, this defective hidden danger is a kind of big threat to electric power netting safe running, very easily damage accident, at present, to the prediction in advance of support insulator defective and hidden danger, traditional way is to be checked with hand wobble by experienced personnel, this method effort, time-consuming, the precision of checking is also poor, and tiny flaw is difficult to find also there is not good solution at present.
Summary of the invention
In order to overcome the potential problem of support insulator and insulator, the invention provides support insulator and porcelain bushing ultrasonic wave defects detecting technology method, this process is changed the manual moving backward way of checking that has a power failure, can be under situation about not having a power failure, chargedly carry out the flaw detection of support insulator and insulator, can find the crackle hidden danger of porcelain spare inside timely and effectively, can shift to an earlier date trouble-saving generation, it is a new breakthrough of repair based on condition of component, to electric substation of power plant lightning arrester, support insulators etc. have possessed proper prophylactic methods because of the fracture of porcelain spare causes accidents such as power failure.
The technical solution adopted for the present invention to solve the technical problems is:
(1) in this scheme, design has support insulator and porcelain bushing ultrasonic wave flaw detection special-purpose probe, this frequency probe is 2.5 million, the refraction angle is 10.5 °-19.5 °, this UT (Ultrasonic Testing) dedicated probe (Fig. 1) has a connection-peg to be communicated with the display screen of instrument, with the test of sliding that coincide of the spill plexiglass block of this probe and measured object, on the display if demonstrate the ripple of the unimodal end (Fig. 6) of measured object, the not damage of this measured object is described, measured object can use continuously; If demonstrate the end ripple (Fig. 2) of bimodal or multimodal, illustrate that promptly this measured object has had damage on the display, should stop using at once, should change rapidly.
(2) determining of flaw detection sensitivity: before measured objects such as support insulator and insulator being detected with probe, should at first determine the benchmark wave height of probe and measured object, i.e. Tan Shang sensitivity wave height, its process is: before with probe measured objects such as support insulator and insulator being detected, should at first determine the benchmark wave height of probe and measured object, i.e. Tan Shang sensitivity wave height, its design has the special-purpose test block of support insulator and insulator special use, make the wall thickness of measured object be equal to measured hole to the distance of measuring the limit reference measurement of popping one's head in, the benchmark of the wave height of the unimodal end that is recorded, there has been the benchmark wave height promptly to compare measurement again as the sensitivity wave height.
(3) determining of zero defect arranged:
(1) when scanning, if there is not bimodal defect waves, isolated end ripple is only arranged, do not have and adhere to clutter, breadth is clear, and acoustic pressure is also high, and this is the flawless definition of measured object.
(2) when scanning, when probe rotates detection with the measured object circumference, though intact trap occurs near the end ripple, but the stronger reflection wave group that similar defect waves really occurred, at this moment, except that end ripple is strong, it is indefinite that other clutter also rises and falls, if mobile probe, this plays that instrument ripple, does not have indication length, changes also big, this belongs to significantly spot defect reflection wave, actual measurement proof, this situation belong to porcelain spare external waviness and cement bond the sand grains place penetrate ripple, it is that manufacturing plant is when inserting cast iron with support insulator, fill the cement of perfusion at the circumference place, glue and sand grains, the sand grains of these gummeds is looped around on the friendship knot face of cast iron and porcelain body as a kind of reinforcing section, and the false just herein zone as the formation of crackle ripple, therefore when ultrasonic scan, crackle ripple that must will be herein and real crackle make a distinction, and this kind situation should decide support insulator and insulator is a serviceable condition.
(4) several differentiation ways are as follows:
(1) when defect waves and end ripple occur simultaneously, the signal of two ripples is than less than 6 decibels, and promptly the defect waves signal is lower than end ripple signal, and the indicating length of ripple should be defined as surface damage during less than 10 millimeters; During greater than 10 millimeters, should be defined as the crackle damage;
(2) when defect waves and end ripple occur simultaneously, the signal of two ripples is than greater than 6 decibels, and the indicating length of end ripple is less than 10 millimeters, and promptly defect waves should be defined as defect waves greater than end wave-wave height;
(3) when defect waves and end ripple occur simultaneously, the signal of two ripples equates that the indicating length of ripple should be spot defect less than 10 millimeters, and indicating length should be decided to be the crackle damage during greater than 10 millimeters;
(4) when checking the outer wall defective, the outer wall defect waves is smaller or equal to surveying the piece wall thickness, during promptly smaller or equal to the benchmark wave height of exploration hole reflection, should measure indicating length, when indicating length during less than 10 millimeters, should be decided to be the crackle damage;
(5) when defect waves greater than surveying the piece wall thickness, during promptly greater than exploration hole reflection benchmark wave height, the indication ripple should be decided to be surface damage smaller or equal to 10 millimeters, when indication wave height during greater than 10 millimeters, should be decided to be the crackle damage.
(6) survey in as find support insulator and insulator inherent vice, should adopt the test block close to make the benchmark wave height and make comparisons with depth of defect.
(5) process that has a power failure support insulator and insulator are detected a flaw in labour: under the fine situation of weather, must use insulating ladder, dress insulated shoes and insulating glove, measure the induced voltage of checking the position and should be lower than 300V; During operation,,, coat machine oil, be attached to slide on the measured object by detecting head and detect, after detection is finished, again with tested position wiped clean as couplant with tested position wiped clean with cotton or toilet paper.
Its beneficial effect is: owing to adopted such scheme, can make this process change the backward way that has a power failure and check by hand, can be under situation about not having a power failure, chargedly carry out the flaw detection of support insulator and insulator, can find the crackle hidden danger of porcelain spare inside timely and effectively, can shift to an earlier date trouble-saving generation, it is a new breakthrough of repair based on condition of component, to electric substation of power plant wall thunder device, support insulator etc. have possessed proper prophylactic methods because of the accidents such as power failure that the fracture of porcelain spare causes.
Description of drawings
The invention will be further described below in conjunction with accompanying drawing.
Accompanying drawing 1 is the structural principle synoptic diagram of support insulator and porcelain bushing ultrasonic wave flaw detection special-purpose probe.
Accompanying drawing 2 is the structural principle synoptic diagram of support insulator and the special-purpose test block of porcelain bushing ultrasonic wave flaw detection probe.
Accompanying drawing 3 detects the synoptic diagram of solid pillar insulator and insulator detection for probe.
Accompanying drawing 4 detects the synoptic diagram of Hollow Pillar insulator and insulator detection for probe.
The situation synoptic diagram of double-humped wave appearred in defect waves and end ripple simultaneously when accompanying drawing 5 was detection.
Accompanying drawing 6 defect waves when detecting only has the situation synoptic diagram of ripple at the bottom of the benchmark.
Embodiment
In Fig. 1, this probe comprises housing 1, plug socket 3, organic glass contact block 8, inserts 6, piezoelectric crystal 7, lead 5 and 2 seven parts of winding wire.It has a rectangular housing 1, the end sealing of housing, and connect a plug socket 3, and being connected with connection-peg 4 in the plug socket 3, the other end of housing 1 is installed organic glass contact block 8; In the housing, be close to organic glass contact block 8, order is equipped with between piezoelectric crystal 7 and inserts 6 plug sockets 3 and the piezoelectric crystal 7 and is connected with winding wire 2, is electrically connected with lead 5 between connection-peg 4 and the piezoelectric crystal 7.During use, plug socket 3 is connected with instrument, and after opening, organic glass contact block 8 coincide with measured object and slides, ultrasonic emitting, reflect through measured object, the unimodal waveform that occurs on the instrument is steady, proves the measured object zero defect, the bimodal waveform that instrument occurs, and alter a great deal, can conclude that measured object has had defective, can in time handle.
In Fig. 2, this special use test block comprises thin plate 9, slab body 13, horizontal, vertical scale mark 11,15, reaches exploration hole 12,14 4 parts; This test block is the steel plate of a rectangle, in its left side, has one curve that this rectangular slab is divided into thin plate 9 and slab body 13 two parts, the top of slab body 13 and right side, have millimetre-sized scale mark 13,15, at the lower side place near slab body 13, from the close-by examples to those far off order has 3 big exploration holes 12, at close upper side edge place, from top to bottom, order has 3 little exploration holes 14, the left side of this test block lower side, be an arc limit, the right-hand part limit is one straight flange; The upper side of this plate body is the face that has radian of a protrusion, and the depression radian face of its protruding radian face and probe matches.During use, move along the projection side of arc, make ultrasound wave, promptly can obtain the reference waveform of different-thickness,, can measure the size of accurate ratio and defective by relatively in different position emissions with the surface of contact of dedicated probe.
In Fig. 3 Fig. 4, on the tested outer wall of hollow and solid pillar insulator 16,21, be fitted with dedicated probe 17, the line slip of going forward side by side detects, after the ultrasound wave 19 of probe detects, double-humped wave 22 can occur on the display screen of instrument, the ripple of this moment is the ripple of gluing place 20 of support insulator 16,21 and cast iron flange 18, should not predicate the crackle ripple.
Claims (6)
1. support insulator and porcelain bushing ultrasonic wave defects detecting technology method, it is characterized in that: support insulator and porcelain bushing ultrasonic wave flaw detection special-purpose probe are arranged, this frequency probe is 2.5 million, the refraction angle is 10.5 °-19.5 °, this probe is communicated with the display screen of instrument, with the test of sliding that coincide of the spill plexiglass block of this probe and measured object, on the display screen if demonstrate the ripple of the unimodal end of measured object, the not damage of this measured object is described, measured object can use continuously; If demonstrate the end ripple of bimodal or multimodal, illustrate that promptly this measured object has had damage on the display, should stop using at once, should change rapidly; It has a rectangular housing described probe, the end sealing of housing, and connect a plug socket, and being connected with connection-peg in the plug socket, the other end of housing is installed the organic glass contact block; In the housing, be close to the organic glass contact block, order is equipped with between piezoelectric crystal and inserts plug socket and the piezoelectric crystal and is connected with winding wire, is electrically connected with lead between connection-peg and the piezoelectric crystal.
2. a kind of support insulator according to claim 1 and porcelain bushing ultrasonic wave defects detecting technology method, it is characterized in that: before the usefulness probe is to support insulator and the detection of insulator measured object, should at first determine the benchmark wave height of probe and measured object, i.e. Tan Shang sensitivity wave height, its design has the special-purpose test block of support insulator and insulator special use, make the wall thickness of measured object, be equal to measured hole to the distance of measuring the limit, the benchmark location survey of popping one's head in then, the benchmark of the wave height of the unimodal end that is recorded, there has been the benchmark wave height to compare measurement again as the sensitivity wave height.
3. a kind of support insulator according to claim 1 and porcelain bushing ultrasonic wave defects detecting technology method, it is characterized in that: when scanning, make probe and the detection that rotates of measured object circumference, though intact trap occurs near the end ripple, but, the stronger reflection wave group that similar defect waves really occurred, at this moment, except that end ripple is strong, it is indefinite that other clutter also rises and falls, if mobile probe, ripple rises one after another, and does not have indication length, change also big, this belongs to significantly spot defect reflection wave, must the general herein the crackle ripple and real crackle make a distinction, this kind situation should decide support insulator and insulator is a serviceable condition.
4. a kind of support insulator according to claim 1 and porcelain bushing ultrasonic wave defects detecting technology method, it is characterized in that: (1) is when defect waves and end ripple occur simultaneously, the signal ratio of two ripples is less than 6 decibels, be that the defect waves signal is lower than end ripple signal, the indicating length of ripple should be defined as surface damage during less than 10 millimeters; During greater than 10 millimeters, should be defined as the crackle damage; (2) when defect waves and end ripple occur simultaneously, the signal of two ripples is than greater than 6 decibels, and the indicating length of end ripple is less than 10 millimeters, and promptly defect waves is tall and big in end wave-wave height, should be defined as defect waves; (3) when defect waves and end ripple occur simultaneously, the signal of two ripples equates that the indicating length of ripple should be decided to be spot defect less than 10 millimeters, and indicating length should be decided to be crackle during greater than 10 millimeters; (4) when checking the outer wall defective, the outer wall defect waves should be measured indicating length when to survey the piece wall thickness be the outer wall defect waves smaller or equal to the benchmark wave height of exploration hole reflection, when indicating length during less than 10 millimeters, should be decided to be crackle; When flaw echo is a flaw echo during greater than exploration hole reflection benchmark wave height greater than surveying the piece wall thickness, the indication wave height should be decided to be surface damage smaller or equal to 10 millimeters; When indicating wave height, should be decided to be the crackle damage greater than 10 millimeters.
5. a kind of support insulator according to claim 1 and porcelain bushing ultrasonic wave defects detecting technology method is characterized in that: as finding support insulator and insulator inherent vice, should adopt the test block close with depth of defect to make the reference wave height ratio in the detection.
6. a kind of support insulator according to claim 1 and porcelain bushing ultrasonic wave defects detecting technology method, it is characterized in that: the process that has a power failure support insulator and insulator are detected a flaw in labour: under the fine situation of weather, must use insulating ladder, dress insulated shoes and insulating glove, measure the induced voltage of checking the position and should be lower than the 300V operation; During operation,,, coat machine oil, be attached to slide on the measured object by detecting head and detect, after detection is finished, again with tested position wiped clean as couplant with tested position wiped clean with cotton or toilet paper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200410014777XA CN100406883C (en) | 2004-04-25 | 2004-04-25 | Technological process for ultrasonic flaw detection of post insulator and porcelain bushing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200410014777XA CN100406883C (en) | 2004-04-25 | 2004-04-25 | Technological process for ultrasonic flaw detection of post insulator and porcelain bushing |
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| Publication Number | Publication Date |
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| CN1690703A CN1690703A (en) | 2005-11-02 |
| CN100406883C true CN100406883C (en) | 2008-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200410014777XA Expired - Fee Related CN100406883C (en) | 2004-04-25 | 2004-04-25 | Technological process for ultrasonic flaw detection of post insulator and porcelain bushing |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608213B (en) * | 2012-01-16 | 2014-05-07 | 中国特种设备检测研究院 | Acoustic detection method for defects of cast iron material |
| CN103336059B (en) * | 2013-06-28 | 2014-06-18 | 云南电力试验研究院（集团）有限公司电力研究院 | Method for judging mechanical strength of post porcelain insulator |
| CN103575809B (en) * | 2013-11-20 | 2016-06-29 | 大连赛瑞金属制品有限公司 | The ultrasonic detection method of suspension insulator steel split foot stricture of vagina |
| CN104034799A (en) * | 2014-03-18 | 2014-09-10 | 国家电网公司 | Ultrasonic phased array detection method for strut porcelain insulator surface and near-surface defects |
| CN103901109A (en) * | 2014-03-31 | 2014-07-02 | 华南理工大学 | Phased array ultrasonic detection device and method for inner defects of composite insulator |
| CN105388216B (en) * | 2015-12-15 | 2017-12-12 | 华北电力科学研究院有限责任公司 | Three fulcrum type insulator vibration detecting instrument |
| CN106706763A (en) * | 2017-01-18 | 2017-05-24 | 天津赛达鑫源检验检测有限公司 | Portable and adjustable tubular-product inner-diameter ultrasonic detection rod |
| CN110596253B (en) * | 2019-07-22 | 2022-05-06 | 株洲时代电子技术有限公司 | Steel rail flaw detection signal generation and processing device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03272459A (en) * | 1990-03-22 | 1991-12-04 | Ngk Insulators Ltd | Deterioration detector of insulator |
| JPH10267900A (en) * | 1997-03-28 | 1998-10-09 | Ngk Insulators Ltd | Method for inspecting interface peeling of polymer insulator tube |
| CN1410768A (en) * | 2002-09-26 | 2003-04-16 | 大连理工大学 | Nondestructive inspection method for electric insulator steel foot and cast zinc ring combined face |
-
2004
- 2004-04-25 CN CN200410014777XA patent/CN100406883C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03272459A (en) * | 1990-03-22 | 1991-12-04 | Ngk Insulators Ltd | Deterioration detector of insulator |
| JPH10267900A (en) * | 1997-03-28 | 1998-10-09 | Ngk Insulators Ltd | Method for inspecting interface peeling of polymer insulator tube |
| CN1410768A (en) * | 2002-09-26 | 2003-04-16 | 大连理工大学 | Nondestructive inspection method for electric insulator steel foot and cast zinc ring combined face |
Non-Patent Citations (6)
| Title |
|---|
| "合成绝缘子内部缺陷的超声检测". 陈大兵等.无损检测，第25卷第6期. 2003 |
| "支柱瓷绝缘子超声波检测研究". 何喜梅等.青海电力，第1期. 2003 |
| "超声评价棒形支柱绝缘子". 李明晶等.无损探伤，第5期. 1996 |
| "合成绝缘子内部缺陷的超声检测". 陈大兵等.无损检测，第25卷第6期. 2003 * |
| "支柱瓷绝缘子超声波检测研究". 何喜梅等.青海电力，第1期. 2003 * |
| "超声评价棒形支柱绝缘子". 李明晶等.无损探伤，第5期. 1996 * |
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