CN114088816B - Calibration system for air type ultrasonic partial discharge detection device - Google Patents
Calibration system for air type ultrasonic partial discharge detection device Download PDFInfo
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- CN114088816B CN114088816B CN202111412779.4A CN202111412779A CN114088816B CN 114088816 B CN114088816 B CN 114088816B CN 202111412779 A CN202111412779 A CN 202111412779A CN 114088816 B CN114088816 B CN 114088816B
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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
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/30—Arrangements for calibrating or comparing, e.g. with standard objects
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
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Abstract
The invention discloses an air type ultrasonic partial discharge detection device calibration system, which comprises a bracket, an ultrasonic sound source, an ultrasonic signal shielding box, a calibration platform and a shielding shell, wherein the bracket is arranged on the bracket; the support comprises a sound source support part for placing an ultrasonic sound source; the signal shielding box bracket part is used for placing the ultrasonic signal shielding box; the calibration platform bracket part is used for placing a calibration platform and a calibration device on the platform; an ultrasonic sound source sends out an ultrasonic signal, the ultrasonic signal is transmitted to a calibration platform through an ultrasonic signal shielding box, and an air ultrasonic signal with a certain sound pressure level is generated at a position to be detected and is used for calibration of the air type ultrasonic partial discharge detection device; a shielding shell is arranged on the periphery of the calibration platform to form sealing isolation; the signals measured by the reference sensor unit are wirelessly transmitted to an upper computer and input into a data acquisition and analysis system of the upper computer; at the moment, at another symmetrical measuring position, the instrument to be measured carries out measurement, and the measured signal is wirelessly transmitted to an upper computer; and comparing, analyzing and calculating by an upper computer.
Description
Technical Field
The invention relates to a detector calibration system, in particular to an air type ultrasonic partial discharge detection device calibration system.
Background
With the rapid development of national economy and the continuous improvement of the living standard of people, the demand of society on electric energy is larger and larger, the capacity of a power grid is continuously enlarged, the voltage grade is gradually improved, and higher requirements are provided for the stability and the reliability of a power system. The research on the technologies of on-line monitoring, fault diagnosis and state evaluation of the power transmission and transformation equipment is enhanced, and the method has important significance for improving the equipment utilization rate and the operation reliability and guaranteeing the safe and economic operation of a power grid. The transition from a scheduled maintenance mode to a state maintenance mode of the power system becomes a necessary trend. Partial discharge is a main cause of insulation degradation, and is also an important sign and manifestation of insulation degradation.
The method for detecting the partial discharge of the switch cabinet mainly comprises a pulse current method ERA, an ultrasonic method, an ultrahigh frequency method UHF, a transient voltage-to-ground voltage method TEV and the like.
Air type ultrasonic detection is one of the most effective detection ways for finding potential insulation defects of power equipment such as power transformers, switch cabinets, cable joints, overhead lines and the like, is the most important detection/monitoring means, and also enters a large-scale popularization and application stage nationwide. However, the performance of the ultrasonic detection system is quantitatively evaluated without a unified standard and an effective means in the industry, so that a large number of false reports are found in engineering practice, which not only causes investment waste, but also causes very bad influence.
In order to solve the above problems, it is necessary to research a set of effective and unified calibration system for an air-type ultrasonic partial discharge detection device, so as to solve the problem that the performance of the air-type ultrasonic partial discharge detection device cannot be regularly checked, and ensure good performance of instrument detection, thereby ensuring that the detection result of the air-type ultrasonic partial discharge detection device can accurately and effectively reflect the operation state of the electrical equipment.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a calibration system for an air type ultrasonic partial discharge detection device.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
a calibration system of an air type ultrasonic partial discharge detection device comprises a support, an ultrasonic sound source, an ultrasonic signal shielding box, a calibration platform and a shielding shell;
the support comprises a sound source support part for placing an ultrasonic sound source; the signal shielding box bracket part is used for placing the ultrasonic signal shielding box; the calibration platform bracket part is used for placing the calibration platform and the calibration device on the platform;
an ultrasonic sound source sends out an ultrasonic signal, the ultrasonic signal is transmitted to a calibration platform through an ultrasonic signal shielding box, and an air ultrasonic signal with a certain sound pressure level is generated at a position to be detected and is used for calibration of the air type ultrasonic partial discharge detection device;
a shielding shell is arranged on the periphery of the calibration platform to form sealing isolation;
the signals measured by the reference sensor unit are wirelessly transmitted to an upper computer and input into a data acquisition and analysis system of the upper computer; at the moment, at another symmetrical measuring position, the instrument to be measured carries out measurement, and the measured signal is wirelessly transmitted to an upper computer; and (4) carrying out comparison analysis calculation by an upper computer.
Furthermore, the calibration platform is provided with a device for adjusting the position to be measured, which comprises a left-right displacement adjusting device and an up-down displacement adjusting device; the upper surface of the upper and lower displacement adjusting device is provided with an ultrasonic sensor mounting platform, one end of the ultrasonic sensor mounting platform, which is close to the calibration platform isolation plate, is provided with an observation plate at the midpoint of the mounting platform, and the observation plate is carved with a cross line;
setting an infrared laser emission point in the middle of an air ultrasonic source, emitting infrared laser through the infrared laser emission point when an air type ultrasonic partial discharge calibration system starts calibration, and then adjusting a left-right displacement adjusting device and an up-down displacement adjusting device to enable an infrared laser point to just hit the middle point of a cross line of an observation plate, wherein the position is the position with the strongest ultrasonic signal field intensity on a calibration platform; based on the position, a reference sensor and a sensor to be measured are symmetrically arranged at the left and right positions adjacent to the central point.
Furthermore, the ultrasonic sensor mounting platform is provided with regularly arranged holes for fixing the observation plate, and symmetrically fixing the reference sensor and the sensor to be measured.
Furthermore, the left-right displacement adjusting device and the up-down displacement adjusting device are manually rotated by the side knobs to adjust the positions.
Furthermore, an ultrasonic sound source sends out an ultrasonic signal, the ultrasonic signal is transmitted through an ultrasonic signal shielding box and is simultaneously received by the symmetrically-placed reference sensor and the sensor to be detected, and the received signal strength is the same.
Furthermore, the ultrasonic signal shielding box is a cuboid with a gradually enlarged cross section, and the body of the ultrasonic signal shielding box comprises a metal shielding shell positioned on the outermost layer, a wood partition plate positioned on the middle layer and sound insulation sponge positioned on the innermost side; the sound insulation sponge is located around the inner wall and is concave-convex.
Furthermore, the bracket also comprises an ultrasonic sound source isolation plate which is used for connecting the ultrasonic sound source and the ultrasonic signal shielding box, and a circular hole is formed in the middle of the isolation plate; and the calibration platform isolation plate is used for connecting the calibration platform and the ultrasonic signal shielding box, and a square hole is formed in the middle of the isolation plate.
Furthermore, the shielding shell comprises a lower fixed part and an upper turnover cover movable part, the fixed part is installed on the calibration platform, and the movable part is connected above the ultrasonic signal shielding box through a bolt and is opened and closed through a side handle.
Compared with the prior art, the calibration platform has the advantages that the structure of the measured object sensor is designed and considered, and the actual engineering detection capability is fully embodied; the calibration platform has high anti-interference performance, stable test result and small interference from external environment.
The calibration system of the non-contact ultrasonic partial discharge detection device is built through independent research and development, and the product can effectively promote the development of a non-contact ultrasonic detection technology and ensure the safe and stable operation of a power grid.
Drawings
FIG. 1 is a schematic diagram of the calibration of an air-based ultrasonic partial discharge detection device;
FIG. 2 is a schematic diagram of a calibration system of the air-based ultrasonic partial discharge detection apparatus;
FIG. 3 is a schematic view of a stent;
FIG. 4 is a schematic view of an ultrasonic sound source;
FIG. 5 is a schematic view of an ultrasonic signal shielding cage;
FIG. 6 is a schematic view of a shield housing;
FIG. 7 is a schematic view of a calibration platform;
FIG. 8 is a schematic view of a device for adjusting a position to be measured;
figure 9 is a schematic view of an ultrasonic sensor mounting platform.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
As shown in fig. 1, the air-type ultrasonic partial discharge calibration system realizes calibration of the ultrasonic partial discharge detector to be detected by using a comparison method. A signal source is adopted to drive a broadband power amplifier, and a broadband ultrasonic sound source and a resonant ultrasonic source are utilized to generate an air ultrasonic signal with a certain sound pressure level at a position to be detected.
The measurement is carried out by using a reference sensor at a symmetrical measurement position, signals measured by a reference sensor unit are input into a data acquisition and analysis system, and the measured sound pressure level of the reference sensor is assumed to beLp (dB, reference 20 μ Pa).
At the moment, the instrument to be measured is used for measuring at another symmetrical measuring position, the position of the sound axis of the sensor of the instrument to be measured is kept consistent with the position of the sound axis of the reference sensor, the reading of the instrument to be measured is read,L(dB, reference 1 μ V). The overall sound pressure sensitivity of the instrument to be measured can be calculated as follows:
wherein Sp is the sound pressure sensitivity of the instrument to be measured and has a unit V/Pa.
The frequency response of different instruments to be tested can be obtained by sequentially changing the driving frequency of the signal source. The driving frequency of the signal source is fixed, the size of the exciting voltage is changed or the gain of the power amplifier is changed, and the linearity measurement result of the instrument to be measured can be obtained.
As shown in fig. 2, the calibration system of the air-based ultrasonic partial discharge detection device according to the present invention includes a support 1, an ultrasonic sound source 2, an ultrasonic signal shielding box 3, a calibration platform 4, and a shielding shell 5.
As shown in fig. 3, a support 1 of the calibration system of the air-based ultrasonic partial discharge detection device of the present invention includes 5 parts, a sound source support part 1-1, for placing an ultrasonic sound source 2; a signal shielding box bracket part 1-2 for placing an ultrasonic signal shielding box 3; a calibration platform support part 1-3 for placing a calibration platform 4 and a calibration device on the platform; the ultrasonic sound source isolation plates 1-4 are used for connecting an ultrasonic sound source and an ultrasonic signal shielding box, and a circular hole is formed in the middle of each isolation plate and is the same as the sound source in size; and the calibration platform isolation plate 1-5 is used for connecting the calibration platform and the ultrasonic signal shielding box, and a square hole is formed in the middle of the isolation plate.
As shown in fig. 4, the ultrasonic sound source 2 is an integrated device, and a signal source is used to drive a broadband power amplifier to emit an ultrasonic signal, and the size of the circular hole formed in the middle of the air ultrasonic source 2-1 and the ultrasonic sound source isolation plate 1-4 is the same, so as to form the isolation of the sound source. When the device is designed, the height of the position of an air ultrasonic source 2-1 is ensured to be completely consistent with the height of a round hole formed in the middle of an ultrasonic sound source isolation plate 1-4, and during test installation, the ultrasonic sound source 2 is only required to be placed on a sound source support part 1-1 and aligned with a vacant position for installation and fixation.
As shown in fig. 5, the ultrasonic signal shielding box 3 is a rectangular parallelepiped with a gradually enlarged cross section, and the body thereof includes 3 layers, a metal shielding case 3-1 located at the outermost layer, a wood partition plate 3-2 located at the middle layer, and a sound insulation sponge 3-3 located at the innermost layer; the sound insulation sponge 3-3 is positioned around the inner wall and is concave-convex; the wooden partition plate 3-2 is used for fixing the sound insulation sponge 3-3, and the metal shielding shell 3-1 at the outermost layer is used for isolating the interference of external signals, so that the detection and calibration are more accurate. An opening on one side of the ultrasonic signal shielding box 3 corresponds to the position of the ultrasonic sound source 2, and the size of the opening is the same as that of the ultrasonic sound source isolation plate 1-4; the other side opening of the ultrasonic signal shielding box 3 corresponds to the calibration platform isolation plates 1-5, and the opening size of the ultrasonic signal shielding box is the same as that of the calibration platform isolation plates 1-5.
As shown in fig. 2 and 6, a shielding shell 5 is arranged around the calibration platform 4 to form a sealed isolation. The shielding shell 5 comprises a lower fixed part 5-1 and an upper turning cover movable part 5-2, the fixed part 5-1 is installed on the calibration platform 4, and the movable part 5-2 is connected above the ultrasonic signal shielding box 3 through a bolt and is opened and closed through a side handle. The shielding shell 5 is a metal shielding shell, forms a shielding space with the whole box body, is used for completing calibration of the detection device, and is not interfered by external signals during testing.
As shown in fig. 6, a viewing window is provided above the movable portion 5-2 of the shield case 5.
As shown in fig. 7 and 8, the calibration platform 4 is provided with a device 6 for adjusting the position to be measured, and the device 6 for adjusting the position to be measured is a bidirectional adjustment device, which includes a left-right displacement adjusting device 6-1, an up-down displacement adjusting device 6-2, and an observation plate 6-3. The upper surface of the up-down displacement adjusting device 6-2 is an ultrasonic sensor mounting platform 6-4, one end of the up-down displacement adjusting device, which is close to the calibration platform isolation plate 1-5, is provided with an observation plate 6-3 at the midpoint of the mounting platform, and the observation plate 6-3 is carved with a cross line.
The left and right displacement adjusting devices 6-1 and the up and down displacement adjusting devices 6-2 are manually rotated by side knobs to adjust positions.
An infrared laser emission point 2-2 is arranged in the middle of an air ultrasonic source 2-1, when an air type ultrasonic partial discharge calibration system starts calibration, infrared laser is firstly emitted through the infrared laser emission point 2-2, then a left-right displacement adjusting device 6-1 and an up-down displacement adjusting device 6-2 are adjusted, so that the infrared laser point is just hit at the middle point of a cross line of an observation plate 6-3, and at the moment, the position is the position with the strongest ultrasonic signal field intensity on a calibration platform. Based on the position, a reference sensor and a sensor to be measured are symmetrically arranged at the left and right positions adjacent to the central point.
As shown in fig. 9, the ultrasonic sensor mounting platform 6-4 is provided with regularly arranged holes for fixing the observation plate 6-3, and symmetrically fixing the reference sensor and the sensor to be measured.
After the positions of the reference sensor and the sensor to be measured are fixed, the cover-turning movable part 5-2 at the upper part of the shielding shell is covered, and then calibration is carried out.
The ultrasonic sound source 2 sends out ultrasonic signals, the ultrasonic signals are transmitted through the ultrasonic signal shielding box 3 and are simultaneously received by the symmetrically-placed reference sensor and the sensor to be detected, and the received signal strength is the same.
The signal measured by the reference sensor unit is wirelessly transmitted to an upper computer and input into a data acquisition and analysis system of the upper computer, and the measured sound pressure level of the reference sensor is assumed to beLp (dB, reference 20 μ Pa). At the other symmetrical measuring position, the instrument to be measured carries out measurement, the measured signal is wirelessly transmitted to the upper computer, the reading of the instrument to be measured is read,L(dB, reference 1 μ V). And analyzing and calculating by an upper computer.
The upper computer has the functions of testing the sensitivity curve of the sensor, detecting the frequency band curve of the sensor, detecting the linearity curve of the sensor and detecting the stability curve of the sensor. All the test data are stored in the database, reports are automatically generated, and intelligent data management can be achieved.
Compared with the prior art, the calibration platform has the advantages that the structure of the measured object sensor is designed and considered, and the actual engineering detection capability is fully embodied; the calibration platform has high anti-interference performance, stable test result and small interference from external environment.
The calibration system of the non-contact ultrasonic partial discharge detection device is built through independent research and development, and the product can effectively promote the development of a non-contact ultrasonic detection technology and ensure the safe and stable operation of a power grid.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (6)
1. An air type ultrasonic partial discharge detection device calibration system is characterized by comprising a support (1), an ultrasonic sound source (2), an ultrasonic signal shielding box (3), a calibration platform (4) and a shielding shell (5);
the support (1) comprises a sound source support part (1-1) for placing an ultrasonic sound source (2); a signal shielding box bracket part (1-2) for placing an ultrasonic signal shielding box (3); a calibration platform support part (1-3) for placing a calibration platform (4) and a calibration device on the platform;
an ultrasonic sound source (2) sends out an ultrasonic signal, the ultrasonic signal is transmitted to a calibration platform (4) through an ultrasonic signal shielding box (3), and an air ultrasonic signal is generated at a position to be detected and is used for calibrating an air type ultrasonic partial discharge detection device;
the ultrasonic signal shielding box (3) is a cuboid with a gradually enlarged cross section, and the body of the ultrasonic signal shielding box comprises a metal shielding shell (3-1) positioned at the outermost layer, a wood partition plate (3-2) positioned at the middle layer and a sound insulation sponge (3-3) positioned at the innermost side; the sound insulation sponge (3-3) is positioned around the inner wall and is concave-convex;
a shielding shell (5) is arranged on the periphery of the calibration platform (4);
the calibration platform (4) is provided with a to-be-measured position adjusting device (6) which comprises a left-right displacement adjusting device (6-1) and an up-down displacement adjusting device (6-2); the upper surface of the up-down displacement adjusting device (6-2) is provided with an ultrasonic sensor mounting platform (6-4), one end of the ultrasonic sensor mounting platform, which is close to the calibration platform isolation plate (1-5), is provided with an observation plate (6-3) at the midpoint of the mounting platform, and the observation plate (6-3) is carved with a cross line;
an infrared laser emission point (2-2) is arranged in the middle of an air ultrasonic source (2-1), when an air type ultrasonic partial discharge calibration system starts calibration, infrared laser is emitted through the infrared laser emission point (2-2), and then a left-right displacement adjusting device (6-1) and an up-down displacement adjusting device (6-2) are adjusted, so that an infrared laser point is just struck on the middle point of a cross line of an observation plate (6-3), and the position is the position with the strongest ultrasonic signal field intensity on a calibration platform; based on the position, symmetrically placing a reference sensor and a sensor to be measured at the left and right positions adjacent to the midpoint;
the signal measured by the reference sensor is wirelessly transmitted to an upper computer and input into a data acquisition and analysis system of the upper computer; at the moment, the symmetrical measuring positions of the sensors are referenced on the platform, the sensors to be measured are measured, and measured signals are wirelessly transmitted to an upper computer; and comparing, analyzing and calculating by an upper computer.
2. The calibration system for the air-based ultrasonic partial discharge detection device according to claim 1, wherein the ultrasonic sensor mounting platform (6-4) is provided with regularly arranged holes for fixing the observation plate (6-3) and symmetrically fixing the reference sensor and the sensor to be detected.
3. The calibration system for the air-based ultrasonic partial discharge detection device according to claim 1, wherein the left-right displacement adjustment device (6-1) and the up-down displacement adjustment device (6-2) are manually rotated by a side knob to adjust positions.
4. The calibration system for the air-based ultrasonic partial discharge detection device according to claim 1, wherein the ultrasonic sound source (2) emits an ultrasonic signal, the ultrasonic signal is transmitted through the ultrasonic signal shielding box (3) and is simultaneously received by the symmetrically-arranged reference sensor and the sensor to be detected, and the received signal intensity is the same.
5. The calibration system for the air-based ultrasonic partial discharge detection device according to claim 1, wherein the support (1) further comprises an ultrasonic sound source isolation plate (1-4) for connecting an ultrasonic sound source and the ultrasonic signal shielding box, and a circular hole is formed in the middle of the isolation plate; and the calibration platform isolation plate (1-5) is used for connecting the calibration platform and the ultrasonic signal shielding box, and a square hole is formed in the middle of the isolation plate.
6. The calibration system for the air-based ultrasonic partial discharge detection device according to claim 1, wherein the shielding shell (5) comprises a lower fixed part (5-1) and an upper flip movable part (5-2), the fixed part (5-1) is installed on the calibration platform (4), and the movable part (5-2) is connected above the ultrasonic signal shielding box (3) through a bolt and is opened and closed through a side handle.
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| CN103591975B (en) * | 2013-11-20 | 2016-05-11 | 深圳市航盛电子股份有限公司 | A kind of ultrasonic sensor index detection method and device |
| CN106226660A (en) * | 2016-06-29 | 2016-12-14 | 中国电力科学研究院 | The metering device of contact ultrasonic Partial discharge detector |
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| JP2001305178A (en) * | 2000-04-24 | 2001-10-31 | Tohoku Denki Hoan Kyokai | Pattern recognition type partial discharge detector |
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