CN114965106A - Rapid testing device and method for GIS free metal particle rebound recovery coefficient - Google Patents

Abstract

The invention discloses a quick testing device and a method for a rebound recovery coefficient of GIS free metal particles, wherein a lifting platform is adopted to adjust the free falling height of the GIS free metal particles, a measuring platform can be arranged in the middle area of the bottom of a GIS shell, the lifting platform with a through hole can enable the metal particles to freely fall from the through hole in the center of the lifting platform, a digital display vernier caliper fixed on the edge of the platform is used for measuring the free falling height of the particles, an acoustic emission signal sensor is used for measuring an acoustic signal generated when the GIS free metal particles collide with the GIS shell, and an acquisition card is used for acquiring the acoustic signal continuously and repeatedly colliding with the GIS shell when the GIS free metal particles fall and transmitting the acoustic signal to an acoustic signal processing unit. And (3) measuring collision sound signals and time intervals when the GIS free metal particles freely fall from different heights for multiple times, and obtaining the particle collision recovery coefficient through an upper computer.

Description

A rapid test device and method for rebound recovery coefficient of GIS free metal particles

technical field

The invention relates to the technical field of GIS, in particular to a rapid testing device and method for the rebound recovery coefficient of GIS free metal particles.

Background technique

The existence of metal particles poses a huge threat to the insulation reliability of gas-insulated combined electrical appliances (GIS). The metal particles are charged by induction and jump up from the surface of the shell under the action of the electric field force, causing distortion to the spatial electric field in the GIS electrode gap, resulting in GIS The insulation performance of GIS is greatly reduced, which brings a huge threat to the normal operation of GIS.

At present, there are few researches on the measurement and calibration device and measurement method of particle collision coefficient. In the previous measurement of particle motion law and particle collision acoustic signal, researchers often use a fixed empirical coefficient instead of particle collision restitution coefficient. However, Due to the differences in the actual measurement environment, particle material, size, and GIS pipeline material, the particle collision restitution coefficient also varies. The existing measurement of the particle collision restitution coefficient uses electromagnets to adsorb metal particles, and controls the on-off of the electromagnet to realize the adsorption of particles and make them fall freely. However, in actual operating conditions, most of the material of metal particles is It is a non-magnetic material, such as metal aluminum, and the above-mentioned measuring device cannot measure and calibrate the collision restitution coefficient of aluminum particles.

It can be seen that due to the current measurement of particle collision restitution coefficients, there are many deficiencies, and it is impossible to use a single collision restitution coefficient to accurately unify the collision restitution coefficients of metal particles of different materials. The method is not suitable for the common metal aluminum particles in GIS, so it is necessary to develop a calibration measurement device suitable for different materials, shapes and actual operating environments.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above deficiencies, and to provide a rapid test device and method for the rebound recovery coefficient of GIS free metal particles. Shape restitution coefficient of metal particles for rapid measurement.

In order to achieve the above purpose, a rapid test device for the rebound recovery coefficient of GIS free metal particles includes a GIS shell, a lifting platform is arranged on the GIS shell, a through hole is opened in the middle of the lifting platform, a digital vernier caliper is arranged on the lifting platform, and the lifting platform is It is used to place GIS free metal particles between it and the GIS shell. The GIS shell is provided with an acoustic emission signal sensor. The acoustic emission signal sensor is connected to the preamplifier, the preamplifier is connected to the acquisition card, and the acquisition card is connected to the host computer;

The acoustic emission signal sensor is used to collect the collision acoustic signal of the GIS free metal particles and the GIS shell, and send it to the preamplifier;

The preamplifier is used to receive the voltage signal of the acoustic emission signal sensor, and output the amplified analog signal to the acquisition card;

The acquisition card is used to collect the output signal of the preamplifier and forward it to the upper computer;

The upper computer is used for data processing according to the received signal.

The inner wall of the GIS shell is arc-shaped, and the free metal particles of the GIS are spherical metal particles.

GIS free metal particles are available in aluminium, steel or copper.

The acoustic emission signal sensor adopts the SR40M acoustic emission sensor of Shenghua Technology Company, the frequency response is 15kHz ~ 70kHz, the resonance frequency is 40kHz, and the sensitivity peak value is greater than -75dB.

The preamplifier adopts PAI type broadband amplifier, the working bandwidth is 10kHz-2MHz, the amplifier gain is 40dB, the input impedance is greater than 50MΩ, and the output impedance is 50Ω.

The preamp has a built-in magnetic clamp.

A test method for a rapid test device for the rebound recovery coefficient of GIS free metal particles, comprising the following steps:

Place the lifting platform in the bottom middle area of the GIS enclosure;

Free fall of GIS free metal particles from the through hole in the middle of the lifting platform;

Measure the free fall height of particles by digital vernier caliper;

Measure the acoustic signal generated when the GIS free metal particles collide with the GIS shell through the acoustic emission signal sensor;

Through the acquisition card, the acoustic signals of the GIS free metal particles that collide with the GIS shell for many times are collected and transmitted to the acoustic emission signal sensor, and the acoustic emission signal sensor sends the collision acoustic signal to the preamplifier;

The preamplifier receives the voltage signal of the acoustic emission signal sensor, and outputs the amplified analog signal to the acquisition card;

The acquisition card collects the output signal of the preamplifier and forwards it to the host computer;

The upper computer performs data processing according to the received signal.

The acquisition card can measure the acoustic signal amplitude and collision time interval generated by GIS free metal particles colliding with the GIS shell, and obtain the particle collision recovery by measuring the acoustic signals and time intervals of the collision when the GIS free metal particles fall freely from different heights. coefficient.

The host computer provides screen display and summary table display for the real-time collected data of the experiment, and batch processes the real-time data and performs statistical analysis and processing.

Compared with the prior art, the present invention adjusts the free fall height of GIS free metal particles by using a lifting platform, the measuring platform can be placed in the GIS shell and placed in the middle area of the bottom, and the lifting platform with through holes can make the metal particles escape from the lifting platform. The central through hole is free-falling, and the digital vernier caliper fixed on the edge of the platform is used to measure the free-falling height of the particles. The acoustic emission signal sensor is used to measure the acoustic signal generated when the GIS free metal particles collide with the GIS shell. When the metal particles fall freely, the acoustic signals that collide with the GIS shell for many times are collected and transmitted to the acoustic signal processing unit. By measuring the collision sound signal and time interval of GIS free metal particles falling freely from different heights many times, the particle collision recovery coefficient is obtained through the host computer. The device of the invention has the advantages of simple structure, convenient use, good robustness and the like, and can quickly measure the restitution coefficient of metal particles of different materials and geometric shapes.

Further, the acquisition card of the present invention can measure the acoustic signal amplitude and the collision time interval generated by particle collision.

Description of drawings

1 is a system diagram of the present invention;

Among them, 1. Lifting platform, 2. Digital vernier caliper, 3. Acoustic emission signal sensor, 4. Preamplifier, 5. Acquisition card, 6. Host computer, 7. GIS shell, 8. GIS free metal particles.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings.

Referring to FIG. 1, a rapid test device for the rebound recovery coefficient of GIS free metal particles includes a GIS casing 7, a lifting platform 1 is arranged on the GIS casing 7, a through hole is opened in the middle of the lifting platform 1, and a digital display is arranged on the lifting platform 1. The vernier caliper 2, the lifting platform 1 and the GIS shell 7 are used to place the GIS free metal particles 8. The GIS shell 7 is provided with an acoustic emission signal sensor 3, the acoustic emission signal sensor 3 is connected to the preamplifier 4, and the preamplifier 4 is connected to the acquisition card 5 , the capture card 5 is connected to the upper computer 6 . The inner wall of the GIS shell 7 is arc-shaped, and the GIS free metal particles 8 are spherical metal particles.

The acoustic emission signal sensor 3 is used to collect the collision acoustic signal of the GIS free metal particles 8 and the GIS shell 7, and send it to the preamplifier 4; the preamplifier 4 is used to receive the voltage signal of the acoustic emission signal sensor 3, and the output is amplified. The analog signal is sent to the acquisition card 5; the acquisition card 5 is used to collect the output signal of the preamplifier 4 and forward it to the upper computer 6; the upper computer 6 is used for data processing according to the received signal.

Preferably, the GIS free metal particles 8 are preferably spherical metal aluminum, stainless steel and copper particles commonly used in actual operating conditions, and the particle geometry size is preferably in the order of sub-millimeter to millimeter, which is basically consistent with the particle geometry size under actual operating conditions.

Preferably, the digital vernier caliper 2 is arranged to measure the free fall height of particles when the lifting platform moves up and down. The digital vernier caliper will automatically collect data during measurement, display the readings, and do not need to manually record the data. The relevant data will be saved in the memory card at any time, and the data can be exported by USB for analysis. The preferred resolution of the digital vernier caliper 2 is 0.01mm, and the allowable error is ±0.03mm/200mm. It has four measurement methods of outer diameter, inner diameter, step and depth measurement, and has the functions of direct measurement and comparison measurement.

Preferably, the acoustic emission signal sensor 3 adopts the SR40M acoustic emission sensor of Shenghua Technology Company, the frequency response is 15kHz-70kHz, the resonance frequency is 40kHz, and the sensitivity peak value is greater than -75dB. Since the ultrasonic signal obtained by free metal particles colliding with the bottom of the cavity is greatly attenuated during transmission, and is easily disturbed by external sound and partial discharge, the collected ultrasonic signal needs to be amplified by the preamplifier and then transmitted to the acquisition card for reading.

Preferably, the preamplifier 4 is a PAI type broadband amplifier, the working bandwidth is 10kHz-2MHz, the amplifier gain is 40dB, the input impedance is greater than 50MΩ, and the output impedance is 50Ω. The preamplifier 4 has a built-in magnetic clamp, which can be adsorbed on the ferromagnetic material. The input terminal of the preamplifier receives the voltage signal output by the acoustic emission sensor, and outputs the amplified analog signal.

Preferably, the analog input channel of the acquisition card is preferably 8 channels, 12-bit precision, 8K word FIFO memory, the sampling frequency is 500KS/s, the channel switching mode is continuous scanning and group scanning, and the number of CTR counter channels is preferably 1 adding counter. The number of bits is 32 and the input frequency is up to 5MHz. The acquisition card automatically collects the sound signal output by the preamplifier and sends it to the host computer for analysis and processing. The acquisition card converts the input analog sound signal into digital signal through multiplexer, amplifier, sample and hold circuit and A/D.

Preferably, the host computer 6 is developed with LabVIEW software, communicates and controls with PLC, stores data through common databases such as SQL, Mysql, ACCESS, etc., to realize data retrospective query, and can also transmit data to MES system to realize comprehensive management.

A test method for a rapid test device for the rebound recovery coefficient of GIS free metal particles, comprising the following steps:

Place the lifting platform 1 in the bottom middle area of the GIS housing 7;

Freely fall the GIS free metal particles 8 from the through hole in the middle of the lifting platform 1;

Measure the free fall height of particles by digital vernier caliper 2;

The acoustic signal generated when the GIS free metal particles 8 collide with the GIS casing 7 is measured by the acoustic emission signal sensor 3;

The acoustic signals of the GIS free metal particles 8 colliding with the GIS shell 7 for many times are collected by the acquisition card 5 and transmitted to the acoustic emission signal sensor 3, and the acoustic emission signal sensor 3 sends the collision acoustic signal to the preamplifier 4. ;

The preamplifier 4 receives the voltage signal of the acoustic emission signal sensor 3, and outputs the amplified analog signal to the acquisition card 5;

The acquisition card 5 collects the output signal of the preamplifier 4 and forwards it to the host computer 6; the acquisition card 5 can measure the acoustic signal amplitude and the collision time interval generated by the collision of the GIS free metal particles 8 with the GIS shell 7, Acoustic signals and time intervals of collision when the GIS free metal particles 8 freely fall from different heights are measured, and the particle collision recovery coefficient is obtained.

The upper computer 6 performs data processing according to the received signal. The host computer provides screen display and summary table display for the real-time collected data of the experiment, and batch processes the real-time data and performs statistical analysis and processing.

Claims (9)

1. a quick test device for the rebound coefficient of recovery of GIS free metal particles, is characterized in that, comprises the GIS shell (7), the GIS shell (7) is provided with the lifting platform (1), and the middle of the lifting platform (1) is provided with a The lifting platform (1) is provided with a digital vernier caliper (2), the lifting platform (1) and the GIS shell (7) are used for placing GIS free metal particles (8), and the GIS shell (7) is provided with an acoustic emission signal The sensor (3), the acoustic emission signal sensor (3) is connected to the preamplifier (4), the preamplifier (4) is connected to the acquisition card (5), and the acquisition card (5) is connected to the upper computer (6); The acoustic emission signal sensor (3) is used to collect the collision acoustic signal of the GIS free metal particles (8) and the GIS casing (7), and send it to the preamplifier (4); The preamplifier (4) is used for receiving the voltage signal of the acoustic emission signal sensor (3), and outputs the amplified analog signal to the acquisition card (5); The acquisition card (5) is used to acquire the output signal of the preamplifier (4) and forward it to the upper computer (6); The upper computer (6) is used for data processing according to the received signal. 2. the fast testing device of a kind of GIS free metal particle rebound coefficient of restitution according to claim 1, is characterized in that, the inner wall of GIS shell (7) is arc-shaped, and GIS free metal particle (8) adopts spherical metal particle . 3 . The rapid test device for the rebound recovery coefficient of GIS free metal particles according to claim 1 or 2 , wherein the GIS free metal particles ( 8 ) are made of aluminum, steel or copper. 4 . 4. the fast testing device of a kind of GIS free metal particle rebound coefficient of restitution according to claim 1, is characterized in that, the acoustic emission signal sensor (3) adopts the SR40M acoustic emission sensor of Shenghua Technology Company, and the frequency response is 15kHz～ 70kHz, the resonant frequency is 40kHz, and the peak sensitivity is greater than -75dB. 5. the fast testing device of a kind of GIS free metal particle rebound coefficient of restitution according to claim 1, is characterized in that, preamplifier (4) adopts PAI type broadband amplifier, and working bandwidth is 10kHz-2MHz, amplifier gain 40dB, The input impedance is greater than 50MΩ, and the output impedance is 50Ω. 6 . The rapid test device for the rebound recovery coefficient of GIS free metal particles according to claim 1 or 5 , wherein the preamplifier ( 4 ) has a built-in magnetic fixture. 7 . 7. the method for testing of the fast testing device of the rebound coefficient of restitution of GIS free metal particles according to claim 1, is characterized in that, comprises the following steps: Place the lifting platform (1) in the bottom middle area of the GIS housing (7); Freely fall the GIS free metal particles (8) from the through hole in the middle of the lifting platform (1); Measure the free fall height of particles by digital vernier caliper (2); The acoustic signal generated when the GIS free metal particles (8) collide with the GIS casing (7) is measured by the acoustic emission signal sensor (3); Acoustic signals of the GIS free metal particles (8) colliding with the GIS shell (7) for many times in succession are collected by the acquisition card (5) and transmitted to the acoustic emission signal sensor (3), and the acoustic emission signal sensor (3) will The collision sound signal is sent to the preamplifier (4); The preamplifier (4) receives the voltage signal of the acoustic emission signal sensor (3), and outputs the amplified analog signal to the acquisition card (5); The acquisition card (5) acquires the output signal of the preamplifier (4), and forwards it to the upper computer (6); The upper computer (6) performs data processing according to the received signal. 8. A test method according to claim 7, characterized in that the acquisition card (5) can measure the acoustic signal amplitude and the collision time interval that the GIS free metal particles (8) collide with the GIS shell (7) , by measuring the acoustic signal and time interval of collision of GIS free metal particles (8) freely falling from different heights for many times, the particle collision recovery coefficient is obtained. 9 . A testing method according to claim 7 , wherein the host computer provides screen display and summary table display for the real-time collection data of the experiment, processes the real-time data in batches and performs statistical analysis processing. 10 .

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