CN110687201A - Detection and identification method for defects of energy storage spring of circuit breaker based on ultrasonic guided waves - Google Patents
Detection and identification method for defects of energy storage spring of circuit breaker based on ultrasonic guided waves Download PDFInfo
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- CN110687201A CN110687201A CN201911020075.5A CN201911020075A CN110687201A CN 110687201 A CN110687201 A CN 110687201A CN 201911020075 A CN201911020075 A CN 201911020075A CN 110687201 A CN110687201 A CN 110687201A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/048—Marking the faulty objects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/11—Analysing solids by measuring attenuation of acoustic waves
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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
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Abstract
The invention relates to the technical field of detection of energy storage springs of circuit breakers, in particular to a detection and identification method for defects of the energy storage springs of the circuit breakers based on ultrasonic guided waves, which comprises the following steps of S1: drawing an energy storage spring ultrasonic guided wave reference DAC curve; s2: detecting the energy storage spring by adopting an ultrasonic guided wave detector; s3: and judging whether the energy storage spring has a reflected wave or not, and judging whether the energy storage spring has defects or not according to the position, the waveform and the amplitude of the reflected wave. The method has simple and easily realized flow, and can realize the quick and accurate identification of the quality of the energy storage spring of the circuit breaker.
Description
Technical Field
The invention relates to the technical field of detection of energy storage springs of circuit breakers, in particular to a detection and identification method for defects of the energy storage springs of the circuit breakers based on ultrasonic guided waves.
Background
The energy storage spring is positioned in the high-voltage circuit breaker and achieves the purposes of storing and releasing energy through the generated and recovered elastic deformation. In the process, the energy storage spring is subjected to fatigue loading, and in addition, factors such as defects generated in the manufacturing process and the like can cause damage such as fatigue cracks and the like in the part after the part is used for a certain time. In recent years, more than ten breaker energy storage spring fracture accidents occur in national power grids and southern power grids, and four high-voltage breaker energy storage spring fracture accidents occur in Guangxi power grids, so that great threat is brought to safe operation of the power grids. Through simulation calculation of the energy storage spring and fracture failure analysis, the maximum stress position of the energy storage spring is the edge of the outer surface and is the fracture starting position, and the energy storage spring is rapidly fractured after the length of a crack source reaches 5 mm. In order to avoid the power grid power failure accident caused by sudden fracture of the energy storage spring, technicians generally adopt an ultrasonic guided wave technology to detect the energy storage spring. However, the existing identification method for detecting defects by using ultrasonic guided waves without the energy storage spring causes difficulty in judging whether the energy storage spring has defects or not by technicians. Therefore, a method for detecting and identifying defects of the energy storage spring of the circuit breaker based on ultrasonic guided waves is needed to guide technicians to carry out detection work of the related energy storage spring.
Disclosure of Invention
In order to solve the problems, the invention provides a method for detecting and identifying the defects of the energy storage spring of the circuit breaker based on ultrasonic guided waves, which has the following specific technical scheme:
a method for detecting and identifying defects of an energy storage spring of a circuit breaker based on ultrasonic guided waves comprises the following steps:
s1: drawing an energy storage spring ultrasonic guided wave reference DAC curve;
s2: detecting the energy storage spring by adopting an ultrasonic guided wave detector;
s3: and judging whether the energy storage spring has a reflected wave or not, and judging whether the energy storage spring has defects or not according to the position, the waveform and the amplitude of the reflected wave.
Preferably, in step S1, specifically, the method includes: and manufacturing an artificial grooving DAC curve with the length of 1-4mm, the width of 1mm and the depth of 1mm by adopting an ultrasonic guided wave detector. Because the energy storage spring can be rapidly broken when the defect length reaches 5mm, the defect length for manufacturing the reference DAC curve needs to be within 5 mm.
Preferably, the step S3 specifically includes the following steps:
s31: when no reflected wave exists, the quality of the energy storage spring is qualified;
s32: when the reflected wave exists and is positioned in the middle of the energy storage spring, the quality of the energy storage spring is qualified;
s33: when a reflected wave exists and is positioned at the edge of the energy storage spring, the waveform of the reflected wave needs to be observed, and if the waveform of the reflected wave is a grass-shaped wave, the quality of the energy storage spring is qualified; if the waveform of the reflected wave is a single pulse waveform, the height of the maximum amplitude of the reflected wave and the DAC curve and the size of the bottom wave reflected wave amplitude are further compared, and the specific steps are as follows:
(1) when the maximum amplitude of the reflected wave exceeds the height of the DAC curve, the quality of the energy storage spring is unqualified;
(2) the maximum amplitude of the reflected wave is lower than the height of the DAC curve, but is higher than the amplitude of the bottom wave reflected wave, and the quality of the energy storage spring is unqualified;
(3) the maximum amplitude of the reflected wave is lower than the height of the DAC curve, but is lower than the bottom wave reflected wave amplitude and higher than 1/2 of the bottom wave reflected wave amplitude, and the quality of the energy storage spring is qualified;
(4) and when the maximum amplitude of the reflected wave is lower than the height of the DAC curve and is lower than 1/2 of the amplitude of the reflected wave of the bottom wave, the quality of the energy storage spring is qualified.
The invention has the beneficial effects that: the invention provides a method for detecting and identifying the defects of the energy storage spring of the circuit breaker based on ultrasonic guided waves, which has simple and easily realized flow and can realize the rapid and accurate identification of the quality of the energy storage spring of the circuit breaker.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a distance-amplitude (DAC) graph of fabrication;
FIG. 3 is a schematic diagram of a reflected wave with a wave form of a grass;
FIG. 4 is a diagram showing reflected wave exceeding the DAC curve;
FIG. 5 is a diagram showing that the reflected wave does not exceed the DAC curve and is higher than the reflected amplitude of the bottom wave;
FIG. 6 is a diagram showing that the reflected wave does not exceed the DAC curve and is higher than 1/2 bottom wave reflection amplitude;
fig. 7 is a diagram illustrating that the reflected wave does not exceed the DAC curve and is below 1/2 bottom wave reflection amplitude.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings in which:
as shown in fig. 1, a method for detecting and identifying defects of a circuit breaker energy storage spring based on ultrasonic guided waves includes the following steps:
s1: the energy storage spring ultrasonic guided wave reference DAC curve is drawn by adopting an ultrasonic guided wave detector, and the energy storage spring can be rapidly broken when the defect length reaches 5mm, so that the defect length for manufacturing the reference DAC curve is required to be within 5mm, the detection precision of the ultrasonic guided wave detector is considered, and specifically, an artificial grooving DAC curve with the length of 3mm, the width of 1mm and the depth of 1mm is manufactured, as shown in figure 2.
S2: and detecting the energy storage spring by adopting an ultrasonic guided wave detector.
S3: and judging whether the energy storage spring has a reflected wave or not, and judging whether the energy storage spring has defects or not according to the position, the waveform and the amplitude of the reflected wave. The method specifically comprises the following steps:
s31: when no reflected wave exists, the quality of the energy storage spring is qualified;
s32: when the reflected wave exists and is positioned in the middle of the energy storage spring, the quality of the energy storage spring is qualified;
s33: when a reflected wave exists and is located at the edge of the energy storage spring, the waveform of the reflected wave needs to be observed, and if the waveform of the reflected wave is a grass-shaped wave, the quality of the energy storage spring is qualified, as shown in fig. 3;
s34: if the waveform of the reflected wave is a single pulse waveform, the height of the maximum amplitude of the reflected wave and the DAC curve and the size of the bottom wave reflected wave amplitude are further compared, and the specific steps are as follows:
(1) when the maximum amplitude of the reflected wave exceeds the height of the DAC curve, the quality of the energy storage spring is unqualified, as shown in FIG. 4;
(2) the maximum amplitude of the reflected wave is lower than the height of the DAC curve, but is higher than the amplitude of the bottom wave reflected wave, the quality of the energy storage spring is unqualified, as shown in FIG. 5;
(3) when the maximum amplitude of the reflected wave is lower than the height of the DAC curve, but is lower than the bottom wave reflected wave amplitude and is higher than 1/2 of the bottom wave reflected wave amplitude, the quality of the energy storage spring is qualified, but the defect is recorded, as shown in FIG. 6;
(4) when the maximum amplitude of the reflected wave is lower than the height of the DAC curve and lower than 1/2 of the amplitude of the reflected wave of the bottom wave, the quality of the energy storage spring is qualified, as shown in FIG. 7.
The present invention is not limited to the above-described embodiments, which are merely preferred embodiments of the present invention, and the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The method for detecting and identifying the defects of the energy storage spring of the circuit breaker based on the ultrasonic guided waves is characterized by comprising the following steps of: the method comprises the following steps:
s1: drawing an energy storage spring ultrasonic guided wave reference DAC curve;
s2: detecting the energy storage spring by adopting an ultrasonic guided wave detector;
s3: and judging whether the energy storage spring has a reflected wave or not, and judging whether the energy storage spring has defects or not according to the position, the waveform and the amplitude of the reflected wave.
2. The method for detecting and identifying the defects of the energy storage spring of the circuit breaker based on the ultrasonic guided waves is characterized by comprising the following steps of: the step S1 specifically includes: and manufacturing an artificial grooving DAC curve with the length of 1-4mm, the width of 1mm and the depth of 1mm by adopting an ultrasonic guided wave detector.
3. The method for detecting and identifying the defects of the energy storage spring of the circuit breaker based on the ultrasonic guided waves is characterized by comprising the following steps of: the step S3 specifically includes the following steps:
s31: when no reflected wave exists, the quality of the energy storage spring is qualified;
s32: when the reflected wave exists and is positioned in the middle of the energy storage spring, the quality of the energy storage spring is qualified;
s33: when a reflected wave exists and is positioned at the edge of the energy storage spring, the waveform of the reflected wave needs to be observed, and if the waveform of the reflected wave is a grass-shaped wave, the quality of the energy storage spring is qualified; if the waveform of the reflected wave is a single pulse waveform, the height of the maximum amplitude of the reflected wave and the DAC curve and the size of the bottom wave reflected wave amplitude are further compared, and the specific steps are as follows:
(1) when the maximum amplitude of the reflected wave exceeds the height of the DAC curve, the quality of the energy storage spring is unqualified;
(2) the maximum amplitude of the reflected wave is lower than the height of the DAC curve, but is higher than the amplitude of the bottom wave reflected wave, and the quality of the energy storage spring is unqualified;
(3) the maximum amplitude of the reflected wave is lower than the height of the DAC curve, but is lower than the bottom wave reflected wave amplitude and higher than 1/2 of the bottom wave reflected wave amplitude, and the quality of the energy storage spring is qualified;
(4) and when the maximum amplitude of the reflected wave is lower than the height of the DAC curve and is lower than 1/2 of the amplitude of the reflected wave of the bottom wave, the quality of the energy storage spring is qualified.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911020075.5A CN110687201B (en) | 2019-10-25 | 2019-10-25 | Detection and identification method for defects of energy storage spring of circuit breaker based on ultrasonic guided waves |
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| CN201911020075.5A CN110687201B (en) | 2019-10-25 | 2019-10-25 | Detection and identification method for defects of energy storage spring of circuit breaker based on ultrasonic guided waves |
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| CN110687201B CN110687201B (en) | 2022-03-11 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106770655A (en) * | 2016-12-14 | 2017-05-31 | 陕西宏远航空锻造有限责任公司 | Metallic article ultrasonic wave water logging detection method |
| CN107102059A (en) * | 2017-03-24 | 2017-08-29 | 大唐东北电力试验研究所有限公司 | Steam turbine generator bearing shell ultrasonic detection method |
| CN107121491A (en) * | 2017-03-24 | 2017-09-01 | 大唐东北电力试验研究所有限公司 | To the turbine generator bearing shell detection method with dovetail groove |
| CN109060955A (en) * | 2018-05-28 | 2018-12-21 | 广西电网有限责任公司电力科学研究院 | A kind of breaker energy storage spring ultrasonic guided wave detecting method |
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- 2019-10-25 CN CN201911020075.5A patent/CN110687201B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106770655A (en) * | 2016-12-14 | 2017-05-31 | 陕西宏远航空锻造有限责任公司 | Metallic article ultrasonic wave water logging detection method |
| CN107102059A (en) * | 2017-03-24 | 2017-08-29 | 大唐东北电力试验研究所有限公司 | Steam turbine generator bearing shell ultrasonic detection method |
| CN107121491A (en) * | 2017-03-24 | 2017-09-01 | 大唐东北电力试验研究所有限公司 | To the turbine generator bearing shell detection method with dovetail groove |
| CN109060955A (en) * | 2018-05-28 | 2018-12-21 | 广西电网有限责任公司电力科学研究院 | A kind of breaker energy storage spring ultrasonic guided wave detecting method |
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