Partial discharge ultrasonic sensor verification method and device applied to substation site

Abstract

The invention discloses a partial discharge ultrasonic sensor verification method and device applied to a substation site, and the method comprises the steps: an upper computer controls a signal generation module to output a first electric signal, and the first electric signal is transmitted to a first ultrasonic transmitting sensor through a power amplification module; the first ultrasonic transmitting sensor receives the first electric signal, converts the first electric signal into an ultrasonic signal, and transmits the signal to the standard ultrasonic sensor and the ultrasonic sensor to be detected; the standard ultrasonic sensor and the ultrasonic sensor to be detected receive the ultrasonic signals and convert the ultrasonic signals into second electric signals and third electric signals, and the second electric signals and the third electric signals are transmitted to the upper computer through the pre-amplification module and the signal acquisition module; and the upper computer is used for analyzing the second electric signal and the third electric signal and visually displaying an analysis result.

Description

Technical Field

[0001] The present invention relates to a sensor calibration technology, in particular to a partial discharge ultrasonic sensor calibration device applied to a transformer substation site. Background Art

[0002] Many sensors are used in partial discharge detection, including high-frequency sensors, ultra-high-frequency sensors, and ultrasonic sensors. Ultrasonic sensors are less susceptible to interference from electromagnetic signals generated by substations, and ultrasonic testing is a non-contact detection method. Therefore, ultrasonic sensors have been widely used in partial discharge detection of various substation equipment.

[0003] Ultrasonic sensors are affected by environmental factors such as temperature, humidity, and dust. The sensor housing and sensitive components may age or become physically damaged, resulting in a decrease in signal detection capabilities. To ensure the accuracy and reliability of ultrasonic sensor detection in field applications, regular calibration is required using an ultrasonic sensor calibration device.

[0004] However, existing calibration methods and devices are mainly used to calibrate ultrasonic sensors in a laboratory environment. The equipment is large in size and inconvenient for on-site workers to carry and operate. Summary of the Invention

[0005] The embodiments of the present application provide a partial discharge ultrasonic sensor calibration device for use at a substation site, which improves the calibration capability and efficiency of the partial discharge ultrasonic sensor at the substation site.

[0006] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides a partial discharge ultrasonic sensor calibration method for use at a substation site. The partial discharge ultrasonic sensor calibration method for use at a substation site includes: a host computer controls a signal generating module to output a first electrical signal, which is transmitted to a first ultrasonic transmitting sensor via a power amplification module; the first ultrasonic transmitting sensor receives the first electrical signal and converts it into a first ultrasonic signal; and the signal is transmitted to a standard ultrasonic sensor and an ultrasonic sensor to be tested; the first electrical signal is a calibration pulse signal with adjustable amplitude, which is confirmed based on the pulse amplitude and decay time constant;

[0008] The first standard ultrasonic sensor receives the first ultrasonic signal and converts the first ultrasonic signal into a second electrical signal; the first ultrasonic sensor to be tested receives the first ultrasonic signal and converts the first ultrasonic signal into a third electrical signal; the second electrical signal and the third electrical signal are transmitted to the host computer via the preamplifier module and the signal acquisition module; the host computer is used to analyze the second and third electrical signals and visualize the analysis results.

[0009] Based on the above description of the partial discharge ultrasonic sensor calibration device for use in a substation, as provided in an embodiment of the present application, it can be seen that the partial discharge ultrasonic sensor calibration method for use in a substation includes a signal generating module outputting a calibration pulse signal source with adjustable amplitude to an ultrasonic transmitting sensor, the ultrasonic transmitting sensor converting the calibration pulse signal source into an acoustic signal and transmitting the acoustic signal to a standard ultrasonic sensor and an ultrasonic sensor to be tested, the standard ultrasonic sensor and the ultrasonic sensor to be tested converting the ultrasonic signal into an electrical signal and transmitting the electrical signal to a signal acquisition module, the signal acquisition module transmitting the signal to a host computer for processing and analysis, and finally displaying the analysis results on the host computer. This enables regular calibration of the ultrasonic sensor, thereby ensuring the accuracy of the test results. Furthermore, the ultrasonic sensor to be tested can be calibrated on-site without removing it from the substation equipment, which helps improve the calibration efficiency of the ultrasonic sensor and ensure the reliability of the sensor.

[0010] In addition, the ultrasonic sensor can be calibrated on site, which shortens the sensor calibration cycle.

[0011] In a feasible implementation of the first aspect, the partial discharge ultrasonic sensor calibration method applied to the substation site also includes: the ultrasonic transmitting sensor is arranged on the outer wall of the substation equipment, and the distance from the first standard ultrasonic sensor is a first preset distance; the first ultrasonic sensor to be tested is also arranged on the outer wall of the substation equipment, and the distance from the ultrasonic transmitting sensor is a second preset distance; and the ultrasonic transmitting sensor, the first standard ultrasonic sensor and the first ultrasonic sensor to be tested are located on the outer wall of the substation on the same side, and are all located on the central axis of the outer wall of the substation equipment, and the ultrasonic transmitting sensor is located in the middle position between the first standard ultrasonic sensor and the second ultrasonic sensor to be tested.

[0012] The first preset distance and the second preset distance are 500 mm.

[0013] The signal generation module outputs the ultrasonic sensor calibration source signal S0(t) through the host computer control calculation formula including:

[0014]

[0015] Where A is the signal amplitude, in V; τ1 is the fast decay time constant, in ms; τ2 is the slow decay time constant, in ms; f0 is the oscillation frequency;

[0016] The calculation formula of the signal amplitude A includes:

[0017] A=KlgU s

[0018] Among them, U s is the voltage level of the substation, in kV. K is selected according to the type of equipment to be detected by the ultrasonic sensor. For transformers, K is selected as 1.8, and for GIS equipment, K is selected as 1.1. τ1 and τ2 are determined by the following formulas:

[0019] τ1=e -0.7A

[0020] τ2=e -0.8A

[0021] In a second aspect, an embodiment of the present application provides a partial discharge ultrasonic sensor calibration device for use in a substation, comprising: a signal generating module, a power amplifying module, an ultrasonic transmitting sensor, a standard ultrasonic sensor, a preamplifying module, a signal acquisition module, and a host computer; a signal transmitting module for outputting a first electrical signal to the power amplifying module; the first electrical signal is a calibration pulse signal source with adjustable amplitude, determined according to the pulse amplitude and the decay time constant; the power amplifying module for amplifying the power of the calibration pulse signal source; the ultrasonic transmitting sensor for receiving the first electrical signal and converting it into an acoustic signal, and transmitting the acoustic signal to the standard sensor and the sensor to be tested. The host computer, the signal generating module, the power amplifying module, and the ultrasonic transmitting sensor are connected via a coaxial cable. The standard ultrasonic sensor is configured to receive a first acoustic signal, convert the first acoustic signal into a second electrical signal, and transmit it to a preamplifier module. The ultrasonic sensor to be tested is configured to receive the first acoustic signal, convert the first acoustic signal into a third electrical signal, and transmit it to the preamplifier module. The preamplifier module is configured to amplify the power of the received second and third electrical signals and transmit them to a signal acquisition module. The signal acquisition module is configured to receive the electrical signals and convert them into a data format that can be processed by a host computer, and transmit the data to the host computer. The host computer is configured to process and analyze the data and visualize the analysis results. The host computer, signal acquisition module, preamplifier module, and standard ultrasonic sensor are connected via a coaxial cable, and the preamplifier module is also connected to the ultrasonic sensor to be tested via a coaxial cable.

[0022] In this way, the signal generating module outputs a calibration pulse signal source with adjustable amplitude to the ultrasonic transmitting sensor, the ultrasonic transmitting sensor converts the electrical signal into an acoustic signal, and transmits it to the standard ultrasonic sensor and the ultrasonic sensor to be tested, the standard ultrasonic sensor and the ultrasonic sensor to be tested convert the received acoustic signal into an electrical signal, and transmit it to the host computer, and finally the analysis results are displayed on the host computer, which can realize regular calibration of the ultrasonic sensor and thus ensure the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1This is a schematic diagram of the partial discharge ultrasonic sensor calibration device used in a substation according to the present invention. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] The present invention provides a partial discharge ultrasonic sensor calibration device for use in substations. This device is suitable for calibrating partial discharge ultrasonic sensors on substation equipment, such as transformers and GIS. This device enables on-site calibration of ultrasonic sensors, thereby ensuring the accuracy of test results. Furthermore, it allows for on-site calibration of the ultrasonic sensors without removing them from the substation equipment, improving ultrasonic sensor calibration efficiency and ensuring sensor reliability. Furthermore, the device enables on-site calibration of ultrasonic sensors, shortening the sensor calibration cycle.

[0026] Figure 1 This is a schematic diagram of the structure of a partial discharge ultrasonic sensor calibration device used in a substation according to an embodiment of the present application. Figure 1 As shown, the on-site calibration device for partial discharge ultrasonic sensors includes: a signal generating module, a power amplifying module, an ultrasonic transmitting sensor, a standard ultrasonic sensor, a preamplifying module, a signal collecting module and a host computer;

[0027] The signal transmitting module is used to output a first electrical signal to the power amplifying module; the first electrical signal is a calibration pulse signal source with adjustable amplitude, which is determined according to the pulse amplitude and the decay time constant;

[0028] The power amplifier module is used to amplify the power of the calibration pulse signal source;

[0029] The ultrasonic transmitting sensor is used to receive the first electrical signal and convert it into an acoustic signal, and transmit the acoustic signal to the standard sensor and the sensor to be tested;

[0030] The host computer, signal generation module, power amplifier module, and ultrasonic emission sensor are connected via a coaxial cable;

[0031] A standard ultrasonic sensor is used to receive a first acoustic signal, convert the first acoustic signal into a second electrical signal, and transmit the second electrical signal to a preamplifier module;

[0032] The ultrasonic sensor to be tested is used to receive the first acoustic signal, convert the first acoustic signal into a third electrical signal, and transmit the third electrical signal to the preamplifier module;

[0033] The preamplifier module is used to amplify the power of the received second electrical signal and the third electrical signal, and transmit the second electrical signal and the third electrical signal to the signal acquisition module;

[0034] The signal acquisition module is used to receive electrical signals and convert them into a data format that can be processed by the host computer, and transmit them to the host computer;

[0035] The host computer is used to process and analyze data and visualize the analysis results;

[0036] The host computer, the signal acquisition module, the preamplifier module and the standard ultrasonic sensor are connected through a coaxial cable, and the preamplifier module and the ultrasonic sensor to be tested are connected through a coaxial cable.

[0037] The partial discharge ultrasonic sensor calibration device used at the substation site also includes: the ultrasonic transmitting sensor is arranged on the outer wall of the substation equipment, and the distance from the first standard ultrasonic sensor is a first preset distance; the second ultrasonic sensor to be tested is also arranged on the outer wall of the substation equipment, and the distance from the ultrasonic transmitting sensor is a second preset distance; and the ultrasonic transmitting sensor, the first standard ultrasonic sensor and the second ultrasonic sensor to be tested are located on the outer wall of the substation equipment on the same side, and are all located on the central axis of the outer wall of the substation equipment. At the same time, the ultrasonic transmitting sensor is located in the middle position between the first standard ultrasonic sensor and the second ultrasonic sensor to be tested.

[0038] The first preset distance and the second preset distance are 500 mm.

[0039] The partial discharge ultrasonic sensor calibration method used in a substation includes:

[0040] S1, the host computer controls the signal generating module to output the first electrical signal, which is transmitted to the first ultrasonic transmitting sensor through the power amplification module. The first electrical signal is a calibration pulse signal with adjustable amplitude, which is confirmed according to the pulse amplitude and decay time constant.

[0041] In some embodiments, the calculation formula of the verification pulse signal S0(t) includes:

[0042]

[0043] Where A is the signal amplitude, in V; τ1 is the fast decay time constant, in ms; τ2 is the slow decay time constant, in ms; f0 is the oscillation frequency;

[0044] The calculation formula of the signal amplitude A includes:

[0045] A=KlgU s

[0046] Among them, U s is the voltage level of the substation, in kV. K is selected according to the type of equipment to be detected by the ultrasonic sensor. For transformers, K is selected as 1.8, and for GIS equipment, K is selected as 1.1. τ1 and τ2 are determined by the following formulas:

[0047] τ1=e -0.7A

[0048] τ2=e -0.8A

[0049] In one implementation, taking the calibration of an ultrasonic sensor for detecting partial discharge of a 220KV transformer as an example, U s =220kV, K=1.8, then A=4.22V, τ1=0.052ms, τ2=0.034ms, then

[0050] S2, the first ultrasonic transmitting sensor receives the first electrical signal and converts it into a first ultrasonic signal, and transmits the signal to the standard ultrasonic sensor and the ultrasonic sensor to be tested;

[0051] S3, the first standard ultrasonic sensor receives the first ultrasonic signal and converts the first ultrasonic signal into a second electrical signal; the first ultrasonic sensor to be tested receives the first ultrasonic signal and converts the first ultrasonic signal into a third electrical signal;

[0052] S4, the second electrical signal and the third electrical signal are transmitted to the host computer via the preamplifier module and the signal acquisition module; the host computer is used to analyze the second and third electrical signals and visualize the analysis results.

Claims

1. A partial discharge ultrasonic sensor calibration method applied to a substation site, characterized in that: The following steps are involved: The host computer controls the signal generating module to output a first electrical signal, which is transmitted to the first ultrasonic transmitting sensor via the power amplification module. The first ultrasonic transmitting sensor receives the first electrical signal and converts it into a first ultrasonic signal, and transmits the signal to the standard ultrasonic sensor and the ultrasonic sensor to be tested; the first electrical signal is a calibration pulse signal with adjustable amplitude, which is confirmed according to the pulse amplitude and the attenuation time constant; The first standard ultrasonic sensor receives the first ultrasonic signal and converts the first ultrasonic signal into a second electrical signal; the first ultrasonic sensor to be tested receives the first ultrasonic signal and converts the first ultrasonic signal into a third electrical signal; the second electrical signal and the third electrical signal are transmitted to the host computer via the preamplifier module and the signal acquisition module; the host computer is used to analyze the second and third electrical signals and visualize the analysis results.

2. The partial discharge ultrasonic sensor calibration method applied to a substation site according to claim 1 is characterized in that: The signal generation module outputs the ultrasonic sensor verification source signal S0(t) through the host computer control; Then the calculation formula of the verification source signal S0(t) includes: Where A is the signal amplitude in V; τ1 is the fast decay time constant in ms; τ2 is the slow decay time constant in ms; and f0 is the oscillation frequency.

3. The partial discharge ultrasonic sensor calibration method applied to a substation site according to claim 1 or 2, characterized in that: The calculation formula of the signal amplitude A includes: A=KlgU s Among them, U s is the voltage level of the substation, in kV; K selects different values ​​according to the type of equipment to be detected by the ultrasonic sensor. K for transformers is 1.8, and K for GIS equipment is 1.

1. τ1 and τ2 are determined by the following formulas: τ1=e -0.7A τ2=e -0.8A 。 4. The partial discharge ultrasonic sensor calibration method applied to a substation site according to claim 1 is characterized in that: The ultrasonic emission sensor, the first standard ultrasonic sensor and the second ultrasonic sensor to be tested are arranged in the following manner: The ultrasonic transmitting sensor is arranged on the outer wall of the substation equipment, and the distance from the first standard ultrasonic sensor is a first preset distance; the first ultrasonic sensor to be tested is also arranged on the outer wall of the substation equipment, and the distance from the ultrasonic transmitting sensor is a second preset distance; and the ultrasonic transmitting sensor, the first standard ultrasonic sensor and the first ultrasonic sensor to be tested are located on the outer wall on the same side of the substation equipment, and are all located on the central axis of the outer wall of the substation equipment, and the ultrasonic transmitting sensor is located in the middle position between the first standard ultrasonic sensor and the second ultrasonic sensor to be tested.

5. A partial discharge ultrasonic sensor calibration device used in a substation, characterized in that: include: Signal generation module, power amplifier module, ultrasonic emission sensor, standard ultrasonic sensor, preamplifier module, signal acquisition module and host computer; A signal transmitting module, used to output a first electrical signal to the power amplifying module; The first electrical signal is a calibration pulse signal source with adjustable amplitude, which is determined according to the pulse amplitude and the decay time constant; The power amplifier module is used to amplify the power of the calibration pulse signal source; The ultrasonic transmitting sensor is used to receive the first electrical signal and convert it into an acoustic signal, and transmit the acoustic signal to the standard sensor and the sensor to be tested; The host computer, the signal generation module, the power amplification module, and the ultrasonic emission sensor are connected via a coaxial cable; A standard ultrasonic sensor, used for receiving a first acoustic signal, converting the first acoustic signal into a second electrical signal, and transmitting the second electrical signal to a preamplifier module; The ultrasonic sensor to be tested is used to receive the first acoustic signal, convert the first acoustic signal into a third electrical signal, and transmit the third electrical signal to the preamplifier module; The preamplifier module is used to amplify the power of the received second electrical signal and the third electrical signal, and transmit the second electrical signal and the third electrical signal to the signal acquisition module; The signal acquisition module is used to receive the electrical signal and convert it into a data format that can be processed by the host computer, and transmit it to the host computer; The host computer is used to process and analyze data and visualize the analysis results; The host computer, the signal acquisition module, the preamplifier module and the standard ultrasonic sensor are connected through a coaxial cable, and the preamplifier module and the ultrasonic sensor to be tested are connected through a coaxial cable.

6. The partial discharge ultrasonic sensor calibration device used in a transformer substation according to claim 5, characterized in that: The signal generation module outputs the ultrasonic sensor verification source signal S0(t) through the host computer control; Then the calculation formula of the verification source signal S0(t) includes: Where A is the signal amplitude in V; τ1 is the fast decay time constant in ms; τ2 is the slow decay time constant in ms; and f0 is the oscillation frequency.

7. The partial discharge ultrasonic sensor calibration device used in a transformer substation according to claim 5 or 6, characterized in that: The calculation formula of the signal amplitude A includes: A=KlgU s Among them, U s is the voltage level of the substation, in kV; K selects different values ​​according to the type of equipment to be detected by the ultrasonic sensor. K for transformers is 1.8, and K for GIS equipment is 1.

1. τ1 and τ2 are determined by the following formulas: τ1=e -0.7A τ2=e -0.8A 。 8. The partial discharge ultrasonic sensor calibration device used in a transformer substation according to claim 5, characterized in that: The ultrasonic emission sensor, the first standard ultrasonic sensor and the second ultrasonic sensor to be tested are arranged in the following manner: The ultrasonic transmitting sensor is arranged on the outer wall of the substation equipment, and the distance from the first standard ultrasonic sensor is a first preset distance; the first ultrasonic sensor to be tested is also arranged on the outer wall of the substation equipment, and the distance from the ultrasonic transmitting sensor is a second preset distance; and the ultrasonic transmitting sensor, the first standard ultrasonic sensor and the first ultrasonic sensor to be tested are located on the outer wall on the same side of the substation equipment, and are all located on the central axis of the outer wall of the substation equipment, and the ultrasonic transmitting sensor is located in the middle position between the first standard ultrasonic sensor and the second ultrasonic sensor to be tested.

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