CN104374651A - Device and method for detecting transformer substation post insulator strength - Google Patents
Device and method for detecting transformer substation post insulator strength Download PDFInfo
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- CN104374651A CN104374651A CN201410602746.XA CN201410602746A CN104374651A CN 104374651 A CN104374651 A CN 104374651A CN 201410602746 A CN201410602746 A CN 201410602746A CN 104374651 A CN104374651 A CN 104374651A
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Abstract
The invention discloses a device and a method for detecting transformer substation post insulator strength. The device comprises an acquisition instrument, a vibration sensor set, a computer and an exciting force hammer, wherein the vibration sensor set is fixed on a post insulator, the acquisition instrument is in communication connection with the vibration sensor set and the computer by virtue of wire cables, and the control end of the exciting force hammer is in communication connection with the acquisition instrument and is used for performing shock excitation on the post insulator under the control of the acquisition instrument. According to the method disclosed by the invention, a post insulator strength detection method is established, detection parameters are optimized, detection technical standards of new post insulators and post insulators in service are respectively proposed, and if the frequency ratio of the new post insulators is more than 90% and the frequency ratio of the post insulators in service is more than 85%, the strength is evaluated to be qualified. The method can be used for judging the influences of various defects (such as cracks, internal sintering defects and gluing part corrosion) on the strength by virtue of the frequency change of the insulator, and is high in detection reliability and high in efficiency.
Description
Technical field
The invention belongs to substation structure detection technique, be specifically related to a kind of transformer station support insulator intensity detecting device and method.
Background technology
Support insulator intensity directly affects the safety of support type bus structure.Shake because bus is windproof the unreasonable of design, and the post insulator protonatomic mass of producing before 2000 is unreliable, there is huge potential safety hazard at present at the supported bus structure of service substation.In addition bus have a power failure not easily and the time short, damage check carried out to support insulator particularly necessary!
The comparatively ripe method of current support insulator Non-Destructive Testing is ultrasound examination.Ultrasound examination has clear and definite working specification, sees standard JB/T 9674-1999 " ultrasonic listening porcelain piece inherent vice ".Ultrasonic detecting technology utilizes material itself or inherent vice to the impact of ultrasonic propagation to judge the size of inside configuration and surface imperfection, shape and distribution situation.Ultrasonic in Dynamic Non-Destruction Measurement, main cause is: (1) is ultrasonic when propagating in media as well, and running into interface can reflect; (2) ultrasound wave has good directive property, and frequency is higher, and directive property is better; (3) ultrasonic energy is large, stronger to the penetration power of various material.It is comparatively strong that it detects adaptability, and detection sensitivity is higher, harmless, use flexibly, the more convenient operation of equipment, equipment is more cheap.For detecting the post insulator period of the day from 11 p.m. to 1 a.m, mainly to the scanning between the adjacent porcelain patticoat of ring flange.But also there is following shortcoming in ultrasound examination: (1) can not carry out live detection; (2) defects such as crackle, pore, slag inclusion can be detected during non-mucilage binding, only can detect surface crack to the insulator after mucilage binding, other bonding quality can not effectively be detected; (3) detection affects by the distance between ring flange and the first base full skirt.
Summary of the invention
The object of this invention is to provide a kind of transformer station support insulator intensity detecting device and method, to realize the detection to transformer station's support insulator intensity.
The technical scheme realizing the object of the invention employing is:
A kind of transformer station support insulator intensity detecting device, comprise Acquisition Instrument, vibration transducer group, computing machine and exciting force hammer, described vibration transducer group is fixed on support insulator, Acquisition Instrument communicates to connect vibration transducer group and computing machine respectively by cable, and the control end of described exciting force hammer communicates to connect Acquisition Instrument and carry out exciting to support insulator under the control of Acquisition Instrument.
Described a kind of transformer station support insulator intensity detecting device, described vibration transducer group comprises two vibration transducers.
Described a kind of transformer station support insulator intensity detecting device, described vibration transducer group is fixed on the central flange of support insulator, and one of them sensor collection direction is the generatrix direction being parallel to support insulator, another sensor gathers the generatrix direction of direction perpendicular to support insulator.
Described a kind of transformer station support insulator intensity detecting device, two described vibration transducers are arranged on the edge of support insulator radial section, and the number of degrees of central angle that two vibration transducers are formed with the line in the center of circle, cross section are respectively 90 °.
Described a kind of transformer station support insulator intensity detecting device, described exciting force hammers the mid point of the central angle that the horizontal direction position of knocking is formed for two vibration transducers into shape, and vertical direction position is support insulator lower flange up the 3rd full skirt place.
A kind of transformer station support insulator strength detecting method, the device described in employing detects, and comprises the following steps:
Step 1: the multiple untapped new support insulator of random choose detects, support insulator arranges sensor, then use exciting force hammer to knock support insulator, obtain two vibration frequency f of each support insulator in vertical bus direction with parallel generatrix direction
i1or f
i2;
Step 2: the vertical bus direction vibration frequency and parallel bus vibration frequency that detect all support insulators obtained are calculated arithmetic mean respectively
with
then each measured value f is calculated respectively
i1or f
i2with corresponding mean value
or
ratio
or
Step 3: the support insulator that in two vibration frequencies, arbitrary or two ratio is less than 90% is judged to be defective.
Described a kind of transformer station support insulator strength detecting method, the post insulator quantum count selected in step 1 is no less than 8.
A kind of transformer station support insulator strength detecting method, the device described in employing detects, and comprises the following steps:
Step 1: the multiple in-service support insulator being arranged at intermediate bus bar or leeward position of random choose detects, support insulator arranges sensor, then use exciting force hammer to knock support insulator, obtain two vibration frequencies of each support insulator in vertical bus direction with parallel generatrix direction;
Step 2: select frequency data maximal value f respectively in two vibration frequencies obtained
max1and f
max2;
Step 3: detect the in-service support insulator being positioned at air port or bus bar edges, obtains corresponding vertical bus direction frequency data f
i1with parallel generatrix direction frequency data f
i2;
Step 4: calculate each measured value f respectively
i1or f
i2with the ratio f of corresponding maximal value
i1/ f
max1or f
i1/ f
max1;
Step 5: the support insulator that in two vibration frequencies, arbitrary or two ratio is less than 85% is judged to be defective.
Described a kind of transformer station support insulator strength detecting method, in step 1, the quantity being arranged at the support insulator at intermediate bus bar or leeward position selected is no less than 6.
Described a kind of transformer station support insulator strength detecting method, the described step obtaining vibration frequency comprises:
Step one: use exciting force hammer to knock support insulator, the number of times knocked is at least once;
Step 2: is averaged respectively with two vibration frequencies of parallel generatrix direction in all vertical bus directions of collecting, two vibration frequencies as each support insulator in vertical bus direction with parallel generatrix direction.
The inventive method establishes support insulator strength detecting method, optimum detection parameter, respectively detection technique standard is proposed to new support insulator and in-service support insulator, new support insulator frequency ratio is greater than 90%, in-service support insulator frequency ratio is greater than 85% to be assessed as intensity qualified.The method passes judgment on all kinds of defect (crackle, inner sintering defect, the gummed position corrosion etc.) impact on its intensity by insulator frequency change, and detecting reliability is high, efficiency is high.
Below in conjunction with accompanying drawing, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is support insulator pick-up unit schematic diagram;
Fig. 2 support insulator schematic diagram;
Perspective view arranged by Fig. 3 sensor;
In figure: 1 be support insulator, 2 be power hammer, 3 be Acquisition Instrument, 4 be microcomputer, 5 be sensor, 6 be central flange, 7 for full skirt.
Embodiment
Device of the present invention comprises Acquisition Instrument, vibration transducer group, computing machine and exciting force hammer, vibration transducer group is fixed on support insulator, Acquisition Instrument communicates to connect vibration transducer group and computing machine respectively by cable, and the control end of exciting force hammer communicates to connect Acquisition Instrument and carry out exciting to support insulator under the control of Acquisition Instrument.
The Acquisition Instrument adopted in the present embodiment should meet stable performance, acquisition precision is high, simultaneously the feature of carrying portable, and sample frequency should reach more than 50kHz, and should possess spectrum analysis function, port number is more than or equal to 8 simultaneously.
The exciting force hammer range selected should be no more than 5000N, and resonance frequency should be greater than 22kHz, causes structural failure to not produce excessive rigid shock to support insulator, can preferentially select the exciting force of nylon tup to hammer into shape.
Vibration transducer group comprises two vibration transducers, and sensor preferentially selects high frequency sensors, and Hz-KHz is at about 1 ~ 10kHz, and sensitivity is 1mv/ms-2, and interface is ICP type.
In order to reach good collection effect, vibration transducer group is fixed on the central flange of support insulator, and one of them sensor collection direction is the generatrix direction being parallel to support insulator, another sensor gathers the generatrix direction of direction perpendicular to support insulator.Two vibration transducers are arranged on the edge of support insulator radial section, and the number of degrees of central angle that two vibration transducers are formed with the line in the center of circle, cross section are respectively 90 °.The bus wherein mentioned is the slender rod piece being fixed on support insulator top, is vertical with the axis of insulator.Supporting bus due to support insulator top has the vibration in vertical bus direction, also the vibration in vertical bus direction is had, general bus is at about 70m, therefore the vibration in vertical bus direction more easily occurs compared with the vibration in parallel bus direction, also namely vertical bus direction is the weak direction of principal axis of support insulator and bus structure.And the sensor of both direction is fixed at support insulator central flange, can test obtaining weak axle and strong axial vibration characteristics, while saving testing amount, make test result have more discriminability.
Hammer in order to exciting force the vibration produced after knocking into shape to be collected accurately respectively by two vibration transducers, exciting force hammers the mid point of the central angle that the horizontal direction position of knocking is formed for two vibration transducers into shape, and vertical direction position is support insulator lower flange up the 3rd full skirt place.Select to be positioned at hammer point the middle part exciting that two sensors forms 1/4 circular arc, because exciting force can decompose along two sensor orientation, therefore simultaneously to vertical bus and parallel bus both direction exciting, the object that two sensors effectively gather both direction vibratory output can be reached.
Transformer station's support insulator strength detecting method, its detected object is the new support insulator not yet come into operation, and adopts said apparatus to detect, comprises the following steps:
Step 1: the multiple untapped new support insulator of random choose detects, support insulator arranges sensor, then use exciting force hammer to knock support insulator, obtain two vibration frequency f of each support insulator in vertical bus direction with parallel generatrix direction
i1or f
i2;
Step 2: the vertical bus direction vibration frequency and parallel bus vibration frequency that detect all support insulators obtained are calculated arithmetic mean respectively
with
then each measured value f is calculated respectively
i1or f
i2with corresponding mean value
or
ratio
or
Step 3: the support insulator that in two vibration frequencies, arbitrary or two ratio is less than 90% is judged to be defective.
In order to reach Detection results comparatively accurately, the post insulator quantum count selected in step 1 is no less than 8.
Transformer station's support insulator strength detecting method, its detected object is the support insulator come into operation, and adopts said apparatus to detect, comprises the following steps:
Step 1: the multiple in-service support insulator being arranged at intermediate bus bar or leeward position of random choose detects, support insulator arranges sensor, then use exciting force hammer to knock support insulator, obtain two vibration frequencies of each support insulator in vertical bus direction with parallel generatrix direction;
Step 2: select frequency data maximal value f respectively in two vibration frequencies obtained
max1and f
max2;
Step 3: detect the in-service support insulator being positioned at air port or bus bar edges, obtains corresponding vertical bus direction frequency data f
i1with parallel generatrix direction frequency data f
i2;
Step 4: calculate each measured value f respectively
i1or f
i2with the ratio f of corresponding maximal value
i1/ f
max1or f
i1/ f
max1;
Step 5: the support insulator that in two vibration frequencies, arbitrary or two ratio is less than 85% is judged to be defective.
In order to obtain result comparatively accurately, in step 1, the quantity being arranged at the support insulator at intermediate bus bar or leeward position selected is no less than 6.Only choose the support insulator being positioned at air port or bus bar edges in step 3 to detect, in generally using, occur that damaging more is all the support insulator being in unfavorable position, for the consideration of testing cost, therefore only choose the support insulator being in unfavorable position and detect.
The above-mentioned step obtaining vibration frequency comprises: step one: use exciting force hammer to knock support insulator, the number of times knocked is at least once; Step 2: is averaged respectively with two vibration frequencies of parallel generatrix direction in all vertical bus directions of collecting, two vibration frequencies as each support insulator in vertical bus direction with parallel generatrix direction.
According to said method, the 220kV bus bar column insulator chosen after the replacing of a certain transformer station carries out detection and analyzes.This batch of insulator amounts to 9 groups, is numbered #1 ~ #9, about 20 years working times.
Shown in pick-up unit accompanying drawing.Arrange two acceleration transducers in support insulator spacer flanger junction, a sensor is arranged in bus parallel direction, another sensor and last sensor layout in 90 °, measures the frequency values along bus and vertical bus both direction insulator respectively.Half angular direction between two sensors adopts power hammer to knock.
Each insulator first order frequency value is as shown in the table.
Table 1 support insulator fundamental frequency (Hz)
As seen from table, there is significant difference in all insulators in the two directions frequency, vertical bus direction frequency is lower than suitable generatrix direction frequency, and this bears the aeolian vibration of bus because insulator is in operation, and the damage of its vertical bus direction is much larger than the damage along generatrix direction.
Owing to there is crackle that is parallel and generatrix direction in #1 support insulator, the frequency of both direction is all well below other insulators.
Suitable generatrix direction frequency maxima is 81.13Hz, this value can be thought the initial frequency value of this batch of insulator, then each insulator vertical bus direction frequency ratio sees the following form, wherein be numbered the insulator frequency ratio of #1, #3, #5, #6 lower than 90%, except #1 insulator has been found that crackle, other insulator ultrasound examination is discovery excessive defect, and this illustrates that insulator also exists other damage, as glued together loosening, underbead crack etc.
Table 2 support insulator vertical bus direction frequency and original frequency ratio
| Numbering | #1 | #2 | #3 | #4 | #5 | #6 | #7 | #8 | #9 |
| Ratio | 60.79％ | 93.89％ | 80.65％ | 97.50％ | 86.66％ | 84.72％ | 93.65％ | 91.36％ | 96.46％ |
The damage value of same insulator vertical bus direction and suitable generatrix direction can be embodied by vibration frequency value.Meanwhile, can find to there is crackle support insulator by vibration detection, absolutely prove that vibration detection post insulator cracks defect is feasible.
Claims (10)
1. transformer station's support insulator intensity detecting device, it is characterized in that, comprise Acquisition Instrument, vibration transducer group, computing machine and exciting force hammer, described vibration transducer group is fixed on support insulator, Acquisition Instrument communicates to connect vibration transducer group and computing machine respectively by cable, and the control end of described exciting force hammer communicates to connect Acquisition Instrument and carry out exciting to support insulator under the control of Acquisition Instrument.
2. a kind of transformer station according to claim 1 support insulator intensity detecting device, it is characterized in that, described vibration transducer group comprises two vibration transducers.
3. a kind of transformer station according to claim 2 support insulator intensity detecting device, it is characterized in that, described vibration transducer group is fixed on the central flange of support insulator, and one of them sensor collection direction is the generatrix direction being parallel to support insulator, another sensor gathers the generatrix direction of direction perpendicular to support insulator.
4. a kind of transformer station according to claim 2 support insulator intensity detecting device, it is characterized in that, two described vibration transducers are arranged on the edge of support insulator radial section, and the number of degrees of central angle that two vibration transducers are formed with the line in the center of circle, cross section are respectively 90 °.
5. a kind of transformer station according to claim 4 support insulator intensity detecting device, it is characterized in that, described exciting force hammers the mid point of the central angle that the horizontal direction position of knocking is formed for two vibration transducers into shape, and vertical direction position is support insulator lower flange up the 3rd full skirt place.
6. transformer station's support insulator strength detecting method, is characterized in that, adopts the arbitrary described device of claim 1-5 to detect, comprises the following steps:
Step 1: the multiple untapped new support insulator of random choose detects, support insulator arranges sensor, then use exciting force hammer to knock support insulator, obtain two vibration frequency f of each support insulator in vertical bus direction with parallel generatrix direction
i1or f
i2;
Step 2: the vertical bus direction vibration frequency and parallel bus vibration frequency that detect all support insulators obtained are calculated arithmetic mean respectively
with
then each measured value f is calculated respectively
i1or f
i2with corresponding mean value
or
ratio
or
Step 3: the support insulator that in two vibration frequencies, arbitrary or two ratio is less than 90% is judged to be defective.
7. a kind of transformer station according to claim 6 support insulator strength detecting method, it is characterized in that, the post insulator quantum count selected in step 1 is no less than 8.
8. transformer station's support insulator strength detecting method, is characterized in that, adopts the arbitrary described device of claim 1-6 to detect, comprises the following steps:
Step 1: the multiple in-service support insulator being arranged at intermediate bus bar or leeward position of random choose detects, support insulator arranges sensor, then use exciting force hammer to knock support insulator, obtain two vibration frequencies of each support insulator in vertical bus direction with parallel generatrix direction;
Step 2: select frequency data maximal value f respectively in two vibration frequencies obtained
max1and f
max2;
Step 3: detect the in-service support insulator being positioned at air port or bus bar edges, obtains corresponding vertical bus direction frequency data f
i1with parallel generatrix direction frequency data f
i2;
Step 4: calculate each measured value f respectively
i1or f
i2with the ratio f of corresponding maximal value
i1/ f
max1or f
i1/ f
max1;
Step 5: the support insulator that in two vibration frequencies, arbitrary or two ratio is less than 85% is judged to be defective.
9. a kind of transformer station according to claim 8 support insulator strength detecting method, is characterized in that, in step 1, the quantity being arranged at the support insulator at intermediate bus bar or leeward position selected is no less than 6.
10. a kind of transformer station support insulator strength detecting method according to claim 6 or 8, it is characterized in that, the described step obtaining the vibration frequency of support insulator comprises:
Step one: use exciting force hammer to knock support insulator, the number of times knocked is at least once;
Step 2: is averaged respectively with two vibration frequencies of parallel generatrix direction in all vertical bus directions of collecting, two vibration frequencies as each support insulator in vertical bus direction with parallel generatrix direction.
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| CN109752623A (en) * | 2018-12-07 | 2019-05-14 | 国网浙江省电力有限公司金华供电公司 | A kind of device causing overhead transmission line failure for the sub- open defect of analog insulation |
| CN110456244A (en) * | 2019-09-25 | 2019-11-15 | 国网陕西省电力公司电力科学研究院 | A kind of basin-type insulator structure state measuring device with electricity and detection method |
| CN110514525A (en) * | 2019-08-29 | 2019-11-29 | 江苏神马电力股份有限公司 | A kind of interior pressure comparative test device |
| CN111160315A (en) * | 2020-01-03 | 2020-05-15 | 云南电网有限责任公司电力科学研究院 | Method and device for acquiring inherent frequency band of post insulator |
| CN116879028A (en) * | 2023-09-07 | 2023-10-13 | 淄博阔泰绝缘子有限公司 | Multi-angle intensity detection device for insulator |
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| CN116879028A (en) * | 2023-09-07 | 2023-10-13 | 淄博阔泰绝缘子有限公司 | Multi-angle intensity detection device for insulator |
| CN116879028B (en) * | 2023-09-07 | 2023-11-07 | 淄博阔泰绝缘子有限公司 | Multi-angle intensity detection device for insulator |
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