CN105223529A - For calibrating installation and the calibration method thereof of ultrasound wave local discharge sensor performance - Google Patents

Abstract

The invention discloses a verification device and a verification method for the performance of an ultrasonic partial discharge sensor. The output end of the sinusoidal signal generator is connected to the acoustic emission sensor, the acoustic emission sensor is arranged on one side of the test block, the reference sensor and the ultrasonic partial discharge sensor to be tested are arranged on the other side of the test block, and the reference sensor is arranged on the other side of the test block. The output end of the sensor is connected with the oscilloscope, and the ultrasonic partial discharge sensor under test outputs the detected ultrasonic signal through the signal acquisition module; the method includes linearity and stability verification. The invention can solve the performance verification problem of the ultrasonic sensor, is easy to implement, can meet the performance verification requirements of the ultrasonic partial discharge detector, and is convenient to adjust the amplitude and frequency of the frequency modulation and amplitude modulation sinusoidal signal generator.

Description

Verification device and verification method for performance of ultrasonic partial discharge sensor

technical field

The invention relates to the technical field of electric power engineering, in particular to a performance verification device for an ultrasonic partial discharge sensor and a verification method thereof, which can realize the performance verification of the linearity and stability of the ultrasonic partial discharge sensor.

Background technique

With the rapid development of my country's economy, various industries have higher and higher requirements for the reliability and stability of power grid power supply, and the number of power outage tests for power equipment will also decrease accordingly. One of the primary means of status information. When partial discharge occurs inside the insulation of power equipment, ultrasonic signals are accompanied by it. The ultrasonic signal is transmitted from the partial discharge source along the insulating medium and metal parts to the electrical equipment casing, and propagates to the surrounding air through the medium and gaps. The ultrasonic sensor installed near the casing of the power equipment or the equipment can be coupled to the ultrasonic signal generated by the partial discharge, and then judge the partial discharge of the power equipment. As an important means of detecting the health status of electrical equipment, ultrasonic partial discharge detection has played an important role in the fault detection of electrical equipment such as combined electrical appliances (GIS), transformers, switch cabinets, and power cables. With the increasing application of ultrasonic partial discharge detection , the performance of the ultrasonic partial discharge sensor has also attracted people's attention. When performing ultrasonic partial discharge detection on power equipment, whether the test results are accurate or not, the performance parameters of the ultrasonic partial discharge sensor are very important.

Contents of the invention

The technical problem to be solved by the present invention: Aiming at the above-mentioned problems of the prior art, it provides a frequency modulation and amplitude modulation sinusoidal signal generator that can solve the performance verification problem of the ultrasonic sensor, is easy to implement, and can meet the performance verification requirements of the ultrasonic partial discharge detector. A verification device and a verification method for the performance of an ultrasonic partial discharge sensor with convenient value and frequency adjustment.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

The invention provides a verification device for the performance of an ultrasonic partial discharge sensor, which includes a FM and AM sine signal generator, an acoustic emission sensor, a test block, a reference sensor, an oscilloscope and a signal acquisition module, and the output of the FM and AM sine signal generator connected to the acoustic emission sensor, the acoustic emission sensor is set on one side of the test block, the reference sensor and the ultrasonic partial discharge sensor to be tested are arranged on the other side of the test block, the output end of the reference sensor and the oscilloscope The ultrasonic partial discharge sensor under test outputs the detected ultrasonic signal through the signal acquisition module.

A coupling agent is provided between the acoustic emission sensor and the test block.

There is a couplant between the reference sensor, the ultrasonic partial discharge sensor to be tested and the test block.

The acoustic emission sensor and the reference sensor are arranged on the same straight line, and the reference sensor and the ultrasonic partial discharge sensor to be tested are symmetrically arranged on the same side of the test block.

The output end of the FM and AM sine signal generator is connected with the acoustic emission sensor through a coaxial cable.

The output end of the reference sensor is connected to the oscilloscope through a coaxial cable.

The test block is a steel block.

The present invention also provides a method for verifying the performance of an ultrasonic partial discharge sensor, comprising the following steps for verifying linearity:

1.1) Initialize and connect the aforementioned verification device for the performance of the ultrasonic partial discharge sensor;

1.2) Set the output frequency of the FM and AM sine signal generator as the sine wave signal of the specified target device frequency f, adjust the output of the FM and AM sine signal generator, so that the output of the measured ultrasonic partial discharge sensor is the output of the measured ultrasonic partial discharge sensor Full-scale value A _max , record the peak voltage U _max output by the reference sensor displayed on the oscilloscope at this time;

1.3) Set a set of values λ _i greater than 0 and less than 1 for the parameter λ initialization;

1.4) For each value λ _i of the parameter λ, adjust the output of the FM and AM sine signal generator so that the voltage output by the reference sensor displayed on the oscilloscope is λ*U _max , and record the output value A _λ of the ultrasonic partial discharge sensor under test ; And calculate the degree error value δ _i corresponding to the value λ _i according to the formula;

${\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}}{{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 100</span>}\mathrm{<span\; class="notranslate">\; \%</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

In formula (1), δ _i is the characteristic error value δ _i corresponding to the i-th value λ _i of the parameter λ, and A _λ is the measured ultrasonic partial discharge sensor corresponding to the i-th value λ _i of the parameter λ Output value, λi is the _i -th value of the parameter λ, and A _max is the full-scale value of the ultrasonic partial discharge sensor under test.

Preferably, the ultrasonic partial discharge sensor verification method also includes the following steps of stability verification:

2.1) Set the output frequency of the FM and AM sine signal generator as the sine wave signal of the specified target device frequency f, adjust the output of the FM and AM sine signal generator, so that the output of the measured ultrasonic partial discharge sensor is the initial amplitude; After the sinusoidal signal generator continues to work for a specified period of time, skip to step 2.2);

2.2) record the output value of the measured ultrasonic partial discharge sensor;

2.3) Making a difference between the initial amplitude and the recorded output value of the ultrasonic partial discharge sensor under test, and outputting it as a result of the stability test.

The present invention is used for the verification device of ultrasonic partial discharge sensor performance and has the following advantages: the present invention comprises frequency modulation amplitude modulation sinusoidal signal generator, acoustic emission sensor, test block, reference sensor, oscilloscope and signal acquisition module, adopts frequency modulation amplitude modulation sinusoidal signal generator The acoustic emission sensor is used as the excitation source of the ultrasonic signal, the test block is used as the transmission medium of the ultrasonic signal, the reference sensor and the oscilloscope are used as the reference for the ultrasonic partial discharge sensor under test to receive the ultrasonic signal, and the detection signal of the ultrasonic partial discharge sensor under test is output through the signal acquisition module. It can provide basic hardware for the linearity and stability detection of ultrasonic partial discharge sensors, can solve the problem of performance verification of ultrasonic sensors, is easy to implement, can meet the performance verification requirements of ultrasonic partial discharge detectors, and the amplitude and Frequency adjustment is convenient.

The verification method of the verification device for the performance of the ultrasonic partial discharge sensor of the present invention is the application method of the verification device for the performance of the ultrasonic partial discharge sensor of the present invention, and the ultrasonic partial discharge is detected based on the verification device for the performance of the ultrasonic partial discharge sensor of the present invention. The linearity test of the sensor is carried out, and the stability test of the ultrasonic partial discharge sensor can also be carried out further.

Description of drawings

Fig. 1 is a schematic diagram of the frame structure of the device of the embodiment of the present invention.

Fig. 2 is a schematic diagram of the installation structure of the device of the embodiment of the present invention.

Fig. 3 is a basic flowchart of the linearity verification of the method of the embodiment of the present invention.

Legend: 1. FM and AM sine signal generator; 2. Acoustic emission sensor; 3. Test block; 4. Reference sensor; 5. Oscilloscope; 6. Signal acquisition module; 7. Ultrasonic partial discharge sensor.

detailed description

As shown in Figures 1 and 2, the verification device used in this embodiment for the performance of an ultrasonic partial discharge sensor includes an FM and AM sine signal generator 1, an acoustic emission sensor 2, a test block 3, a reference sensor 4, an oscilloscope 5 and a signal acquisition module 6. The output terminal of the FM and AM sinusoidal signal generator 1 is connected to the acoustic emission sensor 2, the acoustic emission sensor 2 is set on one side of the test block 3, and the reference sensor 4 and the ultrasonic partial discharge sensor 7 to be tested are jointly arranged on the side of the test block 3 On the other side, the output end of the reference sensor 4 is connected to the oscilloscope 5 , and the detected ultrasonic partial discharge sensor 7 outputs the detected ultrasonic signal through the signal acquisition module 6 . The FM and AM sine signal generator 1 is mainly used to provide a signal source (or excitation source), which can provide a current with an amplitude of 0-10V and a frequency of 0-10MHz. In this embodiment, the FM and AM sine signal generator 1 specifically adopts Beijing The DG4102 signal generator produced by Puyuan Precision Electronics Technology Co., Ltd., in the working state, the FM and AM sine signal generator 1 generates through the acoustic emission sensor 2, converts the electrical signal into an ultrasonic signal, and transmits it to the test block 3 to verify the tested Linearity and stability of ultrasonic sensor 7. The acoustic emission sensor 2 is used to convert the electrical signal into an ultrasonic signal with a frequency greater than 20kHz. Test block 3 is used as a propagation medium for ultrasonic signals, and ultrasonic signals can propagate in test block 3 and be received by the next-level ultrasonic sensors (reference sensor 4 and measured ultrasonic partial discharge sensor 7. Reference sensor 4 is used to The ultrasonic signal is converted into an electrical signal and received by the oscilloscope 5. The frequency f of the ultrasonic signal used for the partial discharge ultrasonic detection of SF ₆ equipment is 20kHz~80kHz, and the frequency f of the ultrasonic signal used for the partial discharge ultrasonic detection of oil-filled equipment is 80kHz~ 200kHz. The oscilloscope 5 is used to display the voltage output by the reference sensor 4. The signal acquisition module 6 is used to output the electrical signal of the ultrasonic partial discharge sensor 7 to be tested after conditioning and A/D conversion to the host computer or processor, so that the host computer Or the processor processes the signal. The measured ultrasonic partial discharge sensor 7 also converts the ultrasonic signal into an electrical signal, and outputs the signal (output to the upper computer or processor) by the signal acquisition module 6. Similarly, for The ultrasonic signal frequency f of partial discharge ultrasonic detection of SF ₆ equipment is 20kHz-80kHz, and the ultrasonic signal frequency f of partial discharge ultrasonic detection of oil-filled equipment is 80kHz-200kHz.

In this embodiment, a coupling agent is provided between the acoustic emission sensor 2 and the test block 3, and the coupling agent can eliminate the air gap between the acoustic emission sensor 2 and the test block 3, so that the acoustic emission sensor 2 and the test block 3 Ultrasonic signal transmission is more fidelity.

In this embodiment, there is a coupling agent between the reference sensor 4, the measured ultrasonic partial discharge sensor 7 and the test block 3, and the coupling agent can exclude the reference sensor 4, the measured ultrasonic partial discharge sensor 7 and the test block 3. The air gap between them makes the ultrasonic signal transmission between the reference sensor 4, the ultrasonic partial discharge sensor 7 under test and the test block 3 more fidelity.

As shown in Figure 2, in this embodiment, the acoustic emission sensor 2 and the reference sensor 4 are arranged on the same straight line, and the reference sensor 4 and the measured ultrasonic partial discharge sensor 7 are symmetrically arranged on the same side of the test block 3, the above structure can Ensure that the reference sensor 4 detects the strength of the ultrasonic signal, and ensure that the measured ultrasonic partial discharge sensor 7 is symmetrically arranged on the test block 3 and the signal difference between the two is small.

In this embodiment, the output end of the FM and AM sine signal generator 1 is connected to the acoustic emission sensor 2 through a coaxial cable. In this embodiment, the output end of the reference sensor 4 is connected to the oscilloscope 5 through a coaxial cable. The coaxial cable has its own shielding layer and has good anti-interference performance, which is especially suitable for on-site inspection of power engineering.

In this embodiment, the test block 3 is a steel block, and other metal blocks can also be used as required.

It should be noted that the oscilloscope 5 may be a traditional oscilloscope or a digital oscilloscope as required. In the case of using a digital oscilloscope, the oscilloscope 5 can also be connected to the host computer or microprocessor directly or through the signal acquisition module 6, but its goal is to read the value on the oscilloscope 5, so its principle is the same as in this embodiment , so the specific implementation form will not be repeated here.

As shown in Figure 3, the verification method of the verification device for the performance of the ultrasonic partial discharge sensor in this embodiment includes the following steps of linearity verification:

1.1) Initialize the connection of the aforementioned verification device for the performance of the ultrasonic partial discharge sensor, the structure of the verification device after the initialization connection can be seen in Figure 2 and Figure 3;

1.2) Set the output frequency of FM/AM sine signal generator 1 to be the sine wave signal of the designated target device frequency f, adjust the output of FM/AM sine signal generator 1, so that the output of the measured ultrasonic partial discharge sensor 7 is the measured ultrasonic local The full-scale value _Amax of the discharge sensor ₇ , record the peak voltage _Umax output by the reference sensor 4 displayed by the oscilloscope 5 at this time; The equipment frequency f is 20kHz-80kHz. If the ultrasonic partial discharge sensor 7 to be tested is used for partial discharge ultrasonic detection of oil-filled equipment, the designated target equipment frequency f is 80kHz-200kHz;

1.3) Set a set of values λ _i greater than 0 and less than 1 for the parameter λ initialization; in this embodiment, set a set of λ _i values {0.8, 0.6, 0.4, 0.2} for the parameter λ initialization, nothing to think Other discrete values greater than 0 and less than 1 can also be added as needed, and details will not be repeated here.

1.4) For each value λ _i of the parameter λ, adjust the output of the FM and AM sine signal generator 1, so that the voltage output by the reference sensor 4 displayed by the oscilloscope 5 is λ*U _max , and record the measured ultrasonic partial discharge sensor 7 Output value A _λ ; and calculate the degree of error value δ _i corresponding to the value λ _i according to formula (1);

${\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}}{{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 100</span>}\mathrm{<span\; class="notranslate">\; \%</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

In formula (1), δ _i is the characteristic error value δ _i corresponding to the i-th value λ _i of the parameter λ, and A _λ is the measured ultrasonic partial discharge sensor 7 corresponding to the i-th value λ _i of the parameter λ λ _i is the i-th value of the parameter λ, and A _max is the full-scale value of the ultrasonic partial discharge sensor 7 under test.

The verification method of the verification device for the performance of the ultrasonic partial discharge sensor in this embodiment also includes the following steps of stability verification:

2.1) setting the output frequency of the FM and AM sine signal generator 1 to be the sine wave signal of the designated target device frequency f, adjusting the output of the FM and AM sine signal generator 1, so that the output of the measured ultrasonic partial discharge sensor 7 is the initial amplitude; Jump to step 2.2) after the FM and AM sine signal generator 1 continues to work for a specified duration; in this embodiment, the specified duration is specifically 1 hour, and other durations can also be used as required, and its principle is the same as in this embodiment;

2.2) record the output value of the measured ultrasonic partial discharge sensor 7;

2.3) Make a difference between the initial amplitude and the recorded output value of the ultrasonic partial discharge sensor 7 under test, and output it as the result of the stability test.

The above descriptions are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention should also be regarded as the protection scope of the present invention.

Claims (9)

1. A verification device for the performance of an ultrasonic partial discharge sensor, characterized in that it comprises an FM and AM sine signal generator (1), an acoustic emission sensor (2), a test block (3), a reference sensor (4), an oscilloscope (5) and signal acquisition module (6), the output terminal of described FM and AM sine signal generator (1) is connected with acoustic emission sensor (2), and described acoustic emission sensor (2) is located at the test block (3) On one side, the reference sensor (4) and the measured ultrasonic partial discharge sensor (7) are jointly arranged on the other side of the test block (3), and the output end of the reference sensor (4) is connected to the oscilloscope (5), The detected ultrasonic partial discharge sensor (7) outputs the detected ultrasonic signal through the signal acquisition module (6). 2. The verification device for the performance of ultrasonic partial discharge sensors according to claim 3, characterized in that: a coupling agent is provided between the acoustic emission sensor (2) and the test block (3). 3. The verification device for ultrasonic partial discharge sensor performance according to claim 4, characterized in that: both of the reference sensor (4), the measured ultrasonic partial discharge sensor (7) and the test block (3) There is a coupling agent between them. 4. The verification device for ultrasonic partial discharge sensor performance according to claim 3 or 4 or 5, characterized in that: the acoustic emission sensor (2) and the reference sensor (4) are arranged on the same straight line, and The reference sensor (4) and the measured ultrasonic partial discharge sensor (7) are symmetrically arranged on the same side of the test block (3). 5. The verification device for ultrasonic partial discharge sensor performance according to claim 6, characterized in that: the output end of the FM and AM sinusoidal signal generator (1) is connected to the acoustic emission sensor (2) through a coaxial cable . 6. The verification device for ultrasonic partial discharge sensor performance according to claim 7, characterized in that: the output end of the reference sensor (4) is connected to the oscilloscope (5) through a coaxial cable. 7. The verification device for the performance of ultrasonic partial discharge sensors according to claim 8, characterized in that: the test block (3) is a steel block. 8. any one of claim 1～7 is used for the verification method of the verification device of ultrasonic partial discharge sensor performance, it is characterized in that, comprises the step of following linearity verification: 1.1) initializing and connecting the verification device for the performance of the ultrasonic partial discharge sensor described in any one of claims 1 to 7; 1.2) set the FM/AM sine signal generator (1) output frequency to be the sine wave signal of the designated target device frequency f, adjust the output of the FM/AM sine signal generator (1), so that the measured ultrasonic partial discharge sensor (7) The output is the full-scale value A _max of the ultrasonic partial discharge sensor (7) under test, and record the peak voltage U _max output by the reference sensor (4) displayed by the oscilloscope (5) at this time; 1.3) Set a set of values λ _i greater than 0 and less than 1 for the parameter λ initialization; 1.4) For each value λ _i of the parameter λ, adjust the output of the FM and AM sine signal generator (1), so that the output voltage of the reference sensor (4) displayed by the oscilloscope (5) is λ*U _max , record the measured The output value A _λ of ultrasonic partial discharge sensor (7); And calculate the characteristic error value δ _i corresponding to this value λ _i according to formula (1); ${\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; x</span>}}}{{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 100</span>}\mathrm{<span\; class="notranslate">\; \%</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$ In formula (1), δ _i is the characteristic error value δ _i corresponding to the i-th value λ _i of the parameter λ, and A _λ is the measured ultrasonic partial discharge sensor corresponding to the i-th value λ _i of the parameter λ ( 7), λ _i is the i-th value of the parameter λ, and A _max is the full-scale value of the ultrasonic partial discharge sensor (7) to be tested. 9. the verification method for the verification device of ultrasonic partial discharge sensor performance according to claim 8, is characterized in that, also comprises the step of following stability verification: 2.1) The output frequency of the FM/AM sine signal generator (1) is set to be the sine wave signal of the designated target device frequency f, and the output of the FM/AM sine signal generator (1) is adjusted so that the measured ultrasonic partial discharge sensor (7) The output is the initial amplitude; after the FM and AM sine signal generator (1) continues to work for a specified period of time, jump to step 2.2); 2.2) record the output value of the measured ultrasonic partial discharge sensor (7); 2.3) Make a difference between the initial amplitude and the recorded output value of the ultrasonic partial discharge sensor (7) to be tested, and output it as the result of the stability test.