Field calibration method and system for active defense device of converter transformer

Abstract

The invention discloses a field calibration method and system for an active defense device of a converter transformer. The field calibration method comprises the following steps: determining a calibration loop wiring mode, a test process and a calibration item qualification criterion for performing different types of performance calibration on the active defense device of the converter transformer; for any type of performance verification, determining a verification loop based on the verification loop wiring mode, and testing based on the test process to obtain test data; and for any type of performance verification, determining a verification result based on the test data and the corresponding verification item qualification criterion. Synchronous verification of the built-in ultrahigh-frequency channel, the built-in acoustic channel and the high-frequency channel is achieved, the response characteristics of the sensor under the composite working condition can be comprehensively reflected, the method is closer to the actual operation environment, and the accuracy and reliability of evaluation are remarkably improved; the test process is standardized, and the evaluation result repeatability is high; the test cost and complexity are reduced, and the test efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of device verification, and more particularly, to a field verification method and system for a converter transformer active defense device. BACKGROUND

[0002] The converter transformer is a core device in a direct current power transmission system, and its operating state directly affects the safety and stability of the entire power transmission system. In order to realize the state evaluation and fault early warning protection of the internal insulation system of the converter transformer, the traditional partial discharge monitoring and relay protection are combined to design an active defense device suitable for the converter transformer.

[0003] The front-end monitoring sensor unit in the converter transformer active defense device performs partial discharge state monitoring on internal defect faults of the converter transformer, specifically including: an embedded ultra-high frequency partial discharge sensing device, an embedded acoustic partial discharge sensing device, and a high-frequency partial discharge sensing device. Among them, the embedded ultra-high frequency and acoustic sensors are usually embedded and installed at the process valve interface at the top of the oil tank of the converter transformer and the oil tank side wall bottom oil drain valve interface; the high-frequency sensor is installed at the core grounding line.

[0004] The effectiveness of the partial discharge monitoring sensor unit is a prerequisite for ensuring the normal operation of the converter transformer active defense device. Therefore, after the partial discharge sensor is first installed and after a period of operation, the performance of the partial discharge sensing device must be periodically verified in the field. The verification items mainly involve key indicators such as sensitivity, frequency response, linearity, and signal-to-noise ratio.

[0005] However, the existing sensing device verification methods mostly rely on laboratory standard devices and simulation platforms, which are difficult to directly migrate to the field application environment. The existing problems include: 1) there is a lack of comprehensive verification means for the sensitivity, frequency response characteristics, and channel consistency of the embedded ultra-high frequency and acoustic sensors in the actual installation state in the existing technology; 2) most of the existing verification means are based on laboratory environments and cannot adapt to the actual space, electromagnetic interference, and complexity of the working conditions in the engineering field; 3) there is a lack of standardized and engineered test procedures and quantitative qualification criteria, resulting in strong subjectivity and poor repeatability of the evaluation results. At present, there is still a lack of a performance verification method suitable for field conditions, simple operation, and clear evaluation criteria, which has become a key technical bottleneck restricting the wide application and operation reliability verification of the converter transformer active defense device.

[0006] Therefore, a field verification method for a converter transformer active defense device is needed. SUMMARY

[0007] The present application proposes a field verification method and system for a converter transformer active defense device to solve the problem of how to verify the converter transformer active defense device in the field.

[0008] In order to solve the above problems, according to one aspect of the present application, a field calibration method of a converter transformer active defense device is provided, the method comprising:

[0009] determining a calibration loop wiring mode, a test process and a calibration item qualified criterion for different types of performance calibration of the converter transformer active defense device;

[0010] for any type of performance calibration, determining a calibration loop based on the calibration loop wiring mode, and testing based on the test process to obtain test data;

[0011] for any type of performance calibration, determining a calibration result based on the test data and the corresponding calibration item qualified criterion.

[0012] Preferably, wherein the different types of performance calibration include: ultra-high frequency sensor performance calibration, acoustic sensor performance calibration and high frequency sensor performance calibration.

[0013] Preferably, wherein for the ultra-high frequency sensor performance calibration, the calibration loop wiring mode comprises: when there is only one built-in sensor in the converter transformer, connecting a handheld ultra-high frequency signal generator to an external ultra-high frequency antenna, injecting a signal from the built-in sensor mounting flange joint, and connecting the built-in sensor to be calibrated to the active defense device to receive the signal; when there are multiple built-in sensors in the converter transformer, connecting two built-in sensors as a group, injecting an abrupt pulse signal through one of the sensors with a handheld ultra-high frequency signal generator, and connecting the built-in sensor to be calibrated to the active defense device to receive the signal;

[0014] the test process comprises: when there is only one built-in sensor in the converter transformer, gradually increasing the injected signal amplitude in the range of 1V-100V, adjusting the angle of the external antenna at the flange joint, and recording whether the active defense device can normally detect the injected pulse signal with an amplitude higher than 2:1 signal-to-noise ratio;

[0015] when there are multiple built-in sensors in the converter transformer, injecting an abrupt pulse signal with an amplitude of 50V through one of the sensors with a handheld ultra-high frequency signal generator, connecting the built-in sensor to be calibrated to the active defense device, and recording whether the active defense device can normally detect the injected pulse signal with an amplitude higher than 2:1 signal-to-noise ratio; and gradually increasing the injected signal amplitude in the range of 1V-100V until the active defense device detects the signal saturation, and according to the response of the active defense device corresponding to each injected signal amplitude;

[0016] The check item qualification criterion comprises: when there is only one built-in sensor in the converter transformer, judging whether the active defense device can display the signal with a signal-to-noise ratio of 2:1 by adjusting the injected signal amplitude and the antenna angle.

[0017] When there are multiple built-in sensors in the converter transformer, judging whether the active defense device can display the signal with a signal-to-noise ratio of more than 2:1 when a 50V signal is injected into one of the built-in sensors; and whether the UHF sensor amplitude linearity meets the linearity error ≤20% between the amplitude display and the excitation signal in the response dynamic range.

[0018] Preferably, for acoustic sensor performance verification, the verification circuit wiring mode comprises: a performance known standard acoustic-electric transducer is arranged on the oil tank outer wall close to the built-in acoustic sensor to be tested, and during calibration, a handheld acoustic signal generator is used to inject a sinusoidal wave signal into the standard acoustic-electric transducer at the sensor deployment position, and the optical output signal of the sensor to be tested is output to the active defense device through an acoustic demodulation unit, and the signal is received by the active defense device;

[0019] The test process comprises: first, a 10V amplitude and 30kHz frequency sinusoidal acoustic wave signal is injected into the oil tank wall through the acoustic-electric transducer, the response signal amplitude of the sensor is measured and recorded, and whether the active defense device can normally detect the injected sinusoidal signal with an amplitude higher than 2:1 signal-to-noise ratio is recorded; and the injected signal amplitude is gradually increased by 1V each time in the range of 1V-20V, until the active defense device detects the signal saturation, the response of the active defense device at each injected signal amplitude is recorded, and an input response curve is drawn;

[0020] The check item qualification criterion comprises: judging whether the injected signal can be normally responded, whether the active defense device can display the signal with a signal-to-noise ratio of 2:1 when a 10V signal is injected, and whether the linearity error ≤20% between the amplitude display and the excitation signal in the response dynamic range is met based on the input response curve.

[0021] Preferably, for high-frequency sensor performance verification, the verification circuit wiring mode comprises:

[0022] The high-frequency sensor performance calibration is performed by a handheld high-frequency signal generator and an excitation sensor coupled through a grounding line to excite a signal, and the high-frequency partial discharge sensor to be verified is connected to the active defense device to receive the signal.

[0023] The test process comprises: firstly, connecting the excitation sensor card to the ground wire of the core or the clamp where the sensor to be checked is located, injecting a 20 nC signal through a handheld high-frequency signal generator, and connecting the signal of the sensor to be checked to the active defense device; secondly, recording whether the active defense device can normally detect the injected pulse signal with an amplitude higher than 2:1 signal-to-noise ratio on the active defense device, and making data records; and finally, gradually increasing the amplitude of the injected signal in the range of 20 pC-100 nC until the active defense device detects the signal saturation, recording the response of the active defense device to each injected signal amplitude, and drawing an input response curve.

[0024] The check item qualification criterion comprises: judging whether the injected signal can normally respond, whether the active defense device can display the signal with a 2:1 signal-to-noise ratio when the 20 nC signal is injected, and whether the linearity error of the amplitude display in the response dynamic range is ≤20% based on the input response curve.

[0025] The method further comprises:

[0026] When the active defense device does not have a data display function, the data of the active defense device is connected to a debugging notebook or a display screen for data presentation; when the sensor does not have the condition of being connected to the active defense device for synchronous checking, an oscilloscope is used to replace the signal acquisition and display function of the active defense device to check the sensor alone.

[0027] According to another aspect of the present application, a field checking system of the active defense device of the converter transformer is provided, and the system comprises:

[0028] A checking data determination module is configured to determine the checking loop wiring mode, the test process and the check item qualification criterion for different types of performance checking of the active defense device of the converter transformer.

[0029] A test data acquisition module is configured to determine the checking loop based on the checking loop wiring mode and acquire test data based on the test process for any type of performance checking.

[0030] A checking result determination module is configured to determine the checking result based on the test data and the corresponding check item qualification criterion for any type of performance checking.

[0031] Preferably, the different types of performance checking comprise: ultrahigh frequency sensor performance checking, acoustic sensor performance checking and high frequency sensor performance checking.

[0032] Preferably, for the performance verification of the ultrahigh frequency sensor, the verification circuit wiring mode comprises: when there is only one built-in sensor in the converter transformer, connecting the handheld ultrahigh frequency signal generator to the external ultrahigh frequency antenna, injecting a signal from the built-in sensor mounting flange joint, and connecting the built-in sensor to be verified to the active defense device to receive the signal; when there are multiple built-in sensors in the converter transformer, connecting two built-in sensors as a group, injecting an abrupt pulse signal through one of the sensors by the handheld ultrahigh frequency signal generator, and connecting the built-in sensor to be verified to the active defense device to receive the signal;

[0033] The test process comprises: when there is only one built-in sensor in the converter transformer, gradually increasing the injected signal amplitude in the range of 1V-100V, adjusting the angle of the external antenna at the flange joint, and recording whether the active defense device can normally detect the injected pulse signal with an amplitude higher than 2:1 signal-to-noise ratio;

[0034] When there are multiple built-in sensors in the converter transformer, injecting an abrupt pulse signal with an amplitude of 50V through one of the sensors by the handheld ultrahigh frequency signal generator, connecting the built-in sensor to be verified to the active defense device, and recording whether the active defense device can normally detect the injected pulse signal with an amplitude higher than 2:1 signal-to-noise ratio; and gradually increasing the injected signal amplitude in the range of 1V-100V until the active defense device detects a saturated signal, and determining the response of the active defense device corresponding to each injected signal amplitude;

[0035] The verification item qualification criterion comprises: when there is only one built-in sensor in the converter transformer, determining whether the active defense device can display the signal with a 2:1 signal-to-noise ratio by adjusting the injected signal amplitude and the antenna angle;

[0036] When there are multiple built-in sensors in the converter transformer, determining whether the active defense device can display the signal with a signal-to-noise ratio higher than 2:1 when a 50V signal is injected through one of the built-in sensors; and whether the ultrahigh frequency sensor amplitude linearity meets the requirement that the amplitude display within the response dynamic range and the excitation signal linearity error is ≤20%.

[0037] Preferably, for the performance verification of the acoustic sensor, the verification circuit wiring mode comprises: setting a standard acoustic-electric transducer with known performance as an excitation source near the outer wall of the oil tank close to the built-in acoustic sensor to be tested, injecting a sinusoidal wave signal to the standard acoustic-electric transducer at the sensor deployment position by the handheld acoustic signal generator during calibration, outputting the optical output signal of the sensor to be tested to the active defense device by the acoustic demodulation unit, and receiving the signal by the active defense device;

[0038] The test process comprises: firstly, injecting a sinusoidal acoustic signal with an amplitude of 10V and a frequency of 30kHz into the tank wall through the acoustic-electric transducer, measuring and recording the response signal amplitude of the sensor, and recording whether the active defense device can normally detect the injected sinusoidal signal with an amplitude higher than 2:1 signal-to-noise ratio; and gradually increasing the injected signal amplitude in a range of 1V-20V, each time by 1V, until the active defense device detects signal saturation, recording the response of the active defense device at each injected signal amplitude, and drawing an input response curve;

[0039] The verification item qualification criterion comprises: judging whether the injected signal can be normally responded, whether the active defense device can display the signal with a 2:1 signal-to-noise ratio when the 10V signal is injected, and whether the linearity error between the amplitude display and the excitation signal in the response dynamic range is ≤20% based on the input response curve.

[0040] Preferably, for high-frequency sensor performance verification, the verification loop wiring mode comprises:

[0041] The high-frequency sensor performance calibration is performed by coupling the excitation signal of the handheld high-frequency signal generator and the excitation sensor through the grounding line, and the high-frequency local discharge sensor to be verified is connected to the active defense device to receive the signal;

[0042] The test process comprises: firstly, connecting the excitation sensor to the grounding line of the iron core or the clamp where the sensor to be verified is located, injecting a 20nC signal through the handheld high-frequency signal generator, and connecting the signal of the sensor to be verified to the active defense device; secondly, recording whether the active defense device can normally detect the injected pulse signal with an amplitude higher than 2:1 signal-to-noise ratio, and making data records; and finally, gradually increasing the injected signal amplitude in a range of 20pC-100nC, until the active defense device detects signal saturation, recording the response of the active defense device at each injected signal amplitude, and drawing an input response curve;

[0043] The verification item qualification criterion comprises: judging whether the injected signal can be normally responded, whether the active defense device can display the signal with a 2:1 signal-to-noise ratio when the 20nC signal is injected, and whether the linearity error between the amplitude display and the excitation signal in the response dynamic range is ≤20% based on the input response curve.

[0044] The system further comprises:

[0045] The data display module is used for connecting the active defense device data to a debugging notebook or a display screen to present data when the active defense device does not have a data display function; and when the sensor does not have the condition of being connected to the active defense device for synchronous inspection, an oscilloscope is used to replace the signal acquisition and display function of the active defense device to individually check the sensor.

[0046] The application provides a field verification method and system for a converter transformer active defense device, comprising: determining a verification loop wiring mode, a test process and a verification item qualified criterion for different types of performance verification of the converter transformer active defense device; for any type of performance verification, determining a verification loop based on the verification loop wiring mode, and performing a test based on the test process to obtain test data; and for any type of performance verification, determining a verification result based on the test data and the corresponding verification item qualified criterion. The application realizes synchronous verification of a built-in ultrahigh frequency channel, a built-in acoustic channel and a high frequency channel, can comprehensively reflect the sensor response characteristics under a composite working condition, is closer to an actual operation environment, significantly improves the accuracy and reliability of evaluation, standardizes the test process, has high repeatability of evaluation results, significantly improves the field adaptability, is convenient for engineering promotion, reduces test cost and complexity and improves test efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0047] The exemplary embodiments of the application can be more completely understood in reference to the following drawings:

[0048] Figure 1 A flowchart of the field verification of the converter transformer active defense device according to the embodiments of the application;

[0049] Figure 2 A field verification loop wiring diagram for an ultrahigh frequency sensor according to the embodiments of the application;

[0050] Figure 3 A field verification loop wiring diagram for an ultrahigh frequency sensor according to the embodiments of the application;

[0051] Figure 4 A field verification loop wiring diagram for an acoustic sensor according to the embodiments of the application;

[0052] Figure 5 A field verification loop wiring diagram for a high frequency sensor according to the embodiments of the application;

[0053] Figure 6 A structure schematic diagram of the field verification system 600 for the converter transformer active defense device according to the embodiments of the application. DETAILED DESCRIPTION

[0054] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0055] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0056] This invention provides a field verification method for active protection devices of converter transformers. Its core lies in establishing standardized and quantifiable field performance verification procedures and criteria for three channels: ultra-high frequency, acoustic, and high frequency. This ensures the accuracy and consistency of online monitoring by such multi-parameter partial discharge sensors. This technical solution overcomes the limitations of existing partial discharge sensor verification methods, which are limited to single methods and cannot be performed on-site. By using a standard signal injection method to excite the built-in sensor at the converter transformer operating site, combined with signal-to-noise ratio response judgment and amplitude linearity analysis, a comprehensive and quantifiable evaluation of the multi-channel sensor performance is achieved. This method possesses high repeatability and practical value applicable to complex field environments.

[0057] Figure 1 This is a flowchart illustrating the field verification 100 of the active defense device for converter transformers according to an embodiment of the present invention. Figure 1 As shown, the field verification method for the active defense device of converter transformers provided by this invention achieves simultaneous verification of the built-in ultra-high frequency channel, built-in acoustic channel, and high frequency channel. It can comprehensively reflect the sensor response characteristics under complex operating conditions, more closely reflect the actual operating environment, and significantly improve the accuracy and reliability of the evaluation. The test process is standardized, and the evaluation results have high repeatability. It significantly improves field adaptability, facilitates engineering promotion, reduces testing costs and complexity, and improves testing efficiency. The field verification method 100 for the active defense device of converter transformers provided by this invention begins at step 101. In step 101, the wiring method of the verification circuit, the test process, and the qualification criteria for different types of performance verification of the active defense device of the converter transformer are determined.

[0058] Preferably, the different types of performance verification include: ultra-high frequency sensing performance verification, acoustic sensing performance verification, and high frequency sensing performance verification.

[0059] Preferably, for the performance verification of the ultrahigh frequency sensor, the verification circuit wiring mode comprises: when there is only one built-in sensor in the converter transformer, connecting the handheld ultrahigh frequency signal generator to the external ultrahigh frequency antenna, injecting a signal from the built-in sensor mounting flange joint, and connecting the built-in sensor to be verified to the active defense device to receive the signal; when there are multiple built-in sensors in the converter transformer, connecting two built-in sensors as a group, injecting an abrupt pulse signal through one of the sensors by the handheld ultrahigh frequency signal generator, and connecting the built-in sensor to be verified to the active defense device to receive the signal;

[0060] The test process comprises: when there is only one built-in sensor in the converter transformer, gradually increasing the injected signal amplitude in the range of 1V-100V, adjusting the angle of the external antenna at the flange joint, and recording whether the active defense device can normally detect the injected pulse signal with an amplitude higher than 2:1 signal-to-noise ratio;

[0061] When there are multiple built-in sensors in the converter transformer, injecting an abrupt pulse signal with an amplitude of 50V through one of the sensors by the handheld ultrahigh frequency signal generator, connecting the built-in sensor to be verified to the active defense device, and recording whether the active defense device can normally detect the injected pulse signal with an amplitude higher than 2:1 signal-to-noise ratio; and gradually increasing the injected signal amplitude in the range of 1V-100V until the active defense device detects a saturated signal, and determining the response of the active defense device corresponding to each injected signal amplitude;

[0062] The verification item qualification criterion comprises: when there is only one built-in sensor in the converter transformer, determining whether the active defense device can display the signal with a 2:1 signal-to-noise ratio by adjusting the injected signal amplitude and the antenna angle;

[0063] When there are multiple built-in sensors in the converter transformer, determining whether the active defense device can display the signal with a signal-to-noise ratio higher than 2:1 when a 50V signal is injected through one of the built-in sensors; and whether the ultrahigh frequency sensor amplitude linearity meets the requirement that the amplitude display within the response dynamic range and the excitation signal linearity error is ≤20%.

[0064] Preferably, for the performance verification of the acoustic sensor, the verification circuit wiring mode comprises: setting a standard acoustic-electric transducer with known performance as an excitation source near the outer wall of the oil tank close to the built-in acoustic sensor to be tested, injecting a sinusoidal wave signal to the standard acoustic-electric transducer at the sensor deployment position by the handheld acoustic signal generator during calibration, outputting the optical output signal of the sensor to be tested to the active defense device by the acoustic demodulation unit, and receiving the signal by the active defense device;

[0065] The test process comprises: firstly, injecting a sinusoidal acoustic signal with an amplitude of 10V and a frequency of 30kHz into the tank wall through the acoustic-electric transducer, measuring and recording the response signal amplitude of the sensor, and recording whether the active defense device can normally detect the injected sinusoidal signal with an amplitude higher than 2:1 signal-to-noise ratio; and gradually increasing the injected signal amplitude in a range of 1V-20V with a step of 1V each time until the active defense device detects signal saturation, recording the response of the active defense device at each injected signal amplitude, and drawing an input response curve;

[0066] The verification item qualification criterion comprises: judging whether the injected signal can be normally responded, whether the active defense device can display the signal with a 2:1 signal-to-noise ratio when the 10V signal is injected, and whether the linearity error between the amplitude display and the excitation signal in the response dynamic range is ≤20% based on the input response curve.

[0067] Preferably, for high-frequency sensor performance verification, the verification loop wiring mode comprises:

[0068] The high-frequency sensor performance calibration is performed by coupling the excitation signal of the handheld high-frequency signal generator and the excitation sensor through the grounding line, and the high-frequency PD sensor to be verified is connected to the active defense device to receive the signal;

[0069] The test process comprises: firstly, connecting the excitation sensor to the grounding line of the core or clamp where the sensor to be verified is located, injecting a 20nC signal through the handheld high-frequency signal generator, and connecting the signal of the sensor to be verified to the active defense device; secondly, recording whether the active defense device can normally detect the injected pulse signal with an amplitude higher than 2:1 signal-to-noise ratio on the active defense device, and making data records; and finally, gradually increasing the injected signal amplitude in a range of 20pC-100nC until the active defense device detects signal saturation, recording the response of the active defense device at each injected signal amplitude, and drawing an input response curve;

[0070] The verification item qualification criterion comprises: judging whether the injected signal can be normally responded, whether the active defense device can display the signal with a 2:1 signal-to-noise ratio when the 20nC signal is injected, and whether the linearity error between the amplitude display and the excitation signal in the response dynamic range is ≤20% based on the input response curve.

[0071] In step 102, for any type of performance verification, the verification loop is determined based on the verification loop wiring mode, and the test is performed based on the test process to obtain test data.

[0072] In step 103, for any type of performance verification, the verification result is determined based on the test data and the corresponding verification item qualification criterion.

[0073] In the present application, the field calibration of the converter transformer active defense device mainly includes a field calibration method of UHF sensing performance, a field calibration method of acoustic sensing performance, and a field calibration method of high-frequency sensing performance. In the present application, first, the calibration loop wiring mode, test process, and calibration item qualified criterion of each sensing performance calibration are determined, and then the field calibration is performed based on the calibration loop wiring mode, test process, and calibration item qualified criterion.

[0074] Specifically, for the field calibration of the UHF sensing performance, the calibration loop wiring mode is divided into the following two cases: if there is only one built-in sensor in the converter transformer, an external UHF antenna should be used for calibration. A handheld UHF signal generator is connected to the external UHF antenna, a signal is injected from the built-in sensor mounting flange joint, the built-in sensor to be calibrated is connected to the active defense device to receive the signal, the signal output amplitude is changed, the amplitude change of the active defense device is recorded, and the sensor performance is determined. If there are multiple built-in sensors in the converter transformer, a group of two built-in sensors can be used for calibration. A handheld UHF signal generator is connected to one of the built-in sensors to inject a signal, the built-in sensor to be calibrated is connected to the active defense device to receive the signal, the signal output amplitude is changed, the amplitude change of the active defense device is recorded, and the sensor performance is determined.

[0075] The test process of the UHF sensing performance mainly includes the following: for the case where there is only one built-in sensor in the converter transformer, first, a handheld UHF signal generator is connected to an external UHF antenna to inject a signal from the built-in sensor mounting flange joint, and the built-in sensor to be calibrated is connected to the active defense device. Then, in the range of 1V-100V, the injected signal amplitude is gradually increased, the angle between the external antenna and the flange joint is adjusted, and whether the active defense device can normally detect the injected pulse signal with a signal-to-noise ratio higher than 2:1 is recorded, and the data is recorded. For the case where there are multiple built-in sensors in the converter transformer, first, a handheld UHF signal generator is connected to one of the sensors to inject a 50V amplitude pulse signal, and the built-in sensor to be calibrated is connected to the active defense device. Then, whether the active defense device can normally detect the injected pulse signal with a signal-to-noise ratio higher than 2:1 is recorded, and the data is recorded. Finally, in the range of 1V-100V, the injected signal amplitude is gradually increased until the active defense device detects the signal saturation. The response of the active defense device to each injected signal amplitude is recorded, the signal injection amplitude is taken as the X-axis, and the active defense device signal response value is taken as the Y-axis, and an input response curve is drawn.

[0076] The pass / fail criteria for the UHF sensor performance verification items are mainly as follows: For cases where only one built-in sensor exists in the converter transformer, a test of the UHF sensor detection effectiveness is required. The active defense device should be able to display the signal with a 2:1 signal-to-noise ratio by adjusting the injected signal amplitude and antenna angle. For cases where multiple built-in sensors exist in the converter transformer, a test of the UHF sensor detection effectiveness is required. The active defense device should be able to display the signal with a signal-to-noise ratio exceeding 2:1 when a 50V signal is injected into one of the built-in sensors. Simultaneously, the linearity of the UHF sensor amplitude also needs to be tested, requiring that the linearity error between the amplitude display and the excitation signal within the response dynamic range be ≤20%.

[0077] For on-site verification of the acoustic sensing performance, the verification circuit wiring method is as follows: a standard acoustic-electric transducer with known performance is used as the excitation source, and during calibration, a handheld acoustic signal is generated.

[0078] The device injects a 10V, 30kHz sinusoidal signal into a standard acoustic-electric transducer near the sensor deployment location. The optical output signal of the sensor under test is connected to the acoustic demodulation module, and the analog output of the acoustic demodulation module is connected to the active defense device. By changing the signal output amplitude of the handheld acoustic signal generator and recording the amplitude change displayed by the active defense device, the sensor performance is determined.

[0079] The testing process for the acoustic sensing performance mainly includes the following steps: First, a standard ultrasonic transducer is placed close to the outer wall of the fuel tank near the built-in acoustic sensor under test, and an appropriate amount of coupling agent is evenly applied between the ultrasonic transducer and the outer wall of the fuel tank. Second, a sinusoidal sound wave signal with a frequency of 30kHz is injected into the fuel tank wall through the ultrasonic transducer, and the amplitude of the sensor's response signal is measured and recorded. Next, the active defense device is monitored to see if it can normally detect the injected sinusoidal signal with an amplitude higher than a 2:1 signal-to-noise ratio, and the data is recorded. Finally, within the range of 1V-20V, the amplitude of the injected signal is gradually increased in 1V increments until the active defense device detects signal saturation. The response of the active defense device at each injected signal amplitude is recorded, and an input response curve is plotted with the injected signal amplitude as the X-axis and the active defense device signal response value as the Y-value.

[0080] The main criteria for passing the acoustic sensor verification project are as follows: An acoustic sensor detection effectiveness test is required. The device must respond normally to the injected signal, and when a 10V signal is injected, the active defense device must display the signal with a signal-to-noise ratio of 2:1. An acoustic sensor amplitude linearity test is required. The linearity error between the amplitude display and the excitation signal within the response dynamic range must be ≤20%.

[0081] For the on-site calibration of the high-frequency sensing performance, the calibration loop is wired as follows: the high-frequency sensing performance calibration is performed by coupling an excitation signal through a handheld high-frequency signal generator and an excitation sensor via a grounding line, the high-frequency partial discharge sensor to be calibrated is connected to the active defense device to receive the signal, the amplitude change of the active defense device is recorded by changing the signal output amplitude, and the sensor performance is determined.

[0082] The test process of the high-frequency sensing performance mainly includes the following steps: firstly, the excitation sensor is clamped to the grounding line of the core or the clamp where the sensor to be calibrated is located, a 20nC signal is injected through a handheld high-frequency signal generator, and the signal of the sensor to be calibrated is connected to the active defense device; secondly, whether the active defense device can normally detect the injected pulse signal with an amplitude higher than 2:1 signal-to-noise ratio is recorded on the active defense device, and data recording is completed; finally, the injected signal amplitude is gradually increased in the range of 20pC-100nC until the active defense device detects the signal saturation. The response of the active defense device to each injected signal amplitude is recorded, and an input response curve is drawn with the signal injection amplitude as the X-axis and the active defense device signal response value as the Y-axis.

[0083] The high-frequency sensing calibration item qualification criterion mainly includes the following steps: the effectiveness test of the high-frequency sensing detection is required; the injected signal can be normally responded, and the active defense device can display the signal with a 2:1 signal-to-noise ratio when the 20nC signal is injected; the high-frequency sensing amplitude linearity detection is required, and the amplitude display in the response dynamic range has a linearity error of less than or equal to 20% with respect to the excitation signal.

[0084] The method further includes the following steps: when the active defense device does not have a data display function, the data of the active defense device is connected to a debugging notebook or a display screen to present the data; when the sensor does not have a condition of being connected to the active defense device for synchronous verification, an oscilloscope is used to replace the signal acquisition and display functions of the active defense device to individually calibrate the sensor.

[0085] The on-site calibration method of the active defense device of the converter transformer provided by the application has significant technical progress and practical application value, and the specific manifestations are as follows:

[0086] 1) The calibration content is comprehensive and meets the application requirements on site

[0087] The application realizes the synchronous calibration of the built-in ultrahigh-frequency channel, the built-in acoustic channel and the high-frequency channel, can comprehensively reflect the response characteristics of the sensor under the composite working condition, is closer to the actual operating environment, and significantly improves the accuracy and reliability of the evaluation.

[0088] 2) The test process is standardized, and the evaluation result has high repeatability

[0089] The application specifies the test connection mode of various channels, signal excitation parameters, response measurement mode and quantitative qualification criterion, so that the test process has good repeatability and operation consistency. The application is suitable for consistency comparison and performance grading management of multiple sensors, and provides a basis for establishing a field standardized detection system.

[0090] 3) Significantly improve the on-site adaptability, facilitate engineering promotion

[0091] All test steps can be carried out on the actual installation site of the converter transformer, without disassembling the equipment and modifying the structure, so that the implementability of the calibration method in the actual engineering is significantly improved.

[0092] 4) Reduce test cost and complexity, improve efficiency

[0093] The application simplifies the test equipment and operation steps, shortens the test period, and reduces the dependence on manpower and the error rate by using a handheld signal source, standardized operation procedures and intuitive criteria. The application is particularly suitable for rapid screening and batch performance verification before large-scale sensor deployment of the converter transformer.

[0094] The following specific examples illustrate the embodiments of the application

[0095] In the embodiments of the application, first, a partial discharge sensor installed in a converter transformer is selected as a measured object to carry out performance calibration in a field environment. The specific steps are as follows:

[0096] For UHF sensor performance calibration, as shown in FIG. 1, for a converter transformer configured with only one built-in sensor, an external UHF antenna is used to inject a signal from the installation flange gap, a handheld UHF signal generator is set to output a pulse signal range of 1V-100V, the voltage is gradually increased and the antenna angle is adjusted, and the display amplitude of the active defense device is observed. The signal display needs to meet the 2:1 signal-to-noise ratio requirement, the amplitude response curve is recorded, and the detection effectiveness and amplitude linearity are evaluated. Figure 2 Figure 3 For UHF sensor performance calibration, as shown in FIG. 1, for a converter transformer configured with only one built-in sensor, an external UHF antenna is used to inject a signal from the installation flange gap, a handheld UHF signal generator is set to output a pulse signal range of 1V-100V, the voltage is gradually increased and the antenna angle is adjusted, and the display amplitude of the active defense device is observed. The signal display needs to meet the 2:1 signal-to-noise ratio requirement, the amplitude response curve is recorded, and the detection effectiveness and amplitude linearity are evaluated. Figure 2 Figure 3 For UHF sensor performance calibration, as shown in FIG. 1, for a converter transformer configured with only one built-in sensor, an external UHF antenna is used to inject a signal from the installation flange gap, a handheld UHF signal generator is set to output a pulse signal range of 1V-100V, the voltage is gradually increased and the antenna angle is adjusted, and the display amplitude of the active defense device is observed. The signal display needs to meet the 2:1 signal-to-noise ratio requirement, the amplitude response curve is recorded, and the detection effectiveness and amplitude linearity are evaluated.

[0097] For acoustic sensor performance calibration, as shown in FIG. 2, Figure 4As shown, a calibrated standard acoustic-electric transducer is arranged at the position corresponding to the built-in acoustic sensor on the outer wall of the converter transformer oil tank, and a coupling agent is uniformly applied. A handheld acoustic signal generator is used to inject a 10V amplitude and 30kHz frequency sine wave as an excitation, the output of the sensor to be tested is connected to an acoustic demodulation module, and a active defense device is connected. The injected signal amplitude is gradually increased to the range of 20V, and the response change of the active defense device is recorded. Draw the amplitude input response curve, and determine whether the signal can be detected with a signal-to-noise ratio of more than 2:1 under the condition of 50V injection, and check whether the linear error of the response curve is ≤20%.

[0098] For high-frequency sensor performance verification, such as Figure 5 As shown, the excitation sensor is clamped to the core or the ground line position of the clamp, and a high-frequency signal generator is used to inject pulse signals of 20pC-100nC in sequence, and the measured sensor signal is connected to the active defense device for detection. Determine whether the active defense device can reach a signal-to-noise ratio of 2:1 under the excitation of 20nC, record the response amplitude of each point, and draw the input response curve. Evaluate the linearity of the response curve and confirm whether the amplitude error in the dynamic range meets the performance index of ≤20%.

[0099] In this embodiment, the recommended parameters of the verification device are shown in Table 1.

[0100] Table 1 Verification device recommended parameter table

[0101]

[0102] In this embodiment, by simulating various field injection and measurement conditions, the signal response capability of the built-in partial discharge sensor in the three channels of ultrahigh frequency, acoustic and high frequency is comprehensively verified. The actual test results show that the measured sensor can meet the response signal-to-noise ratio and linear error determination standard under the excitation of the three kinds of signals, which verifies the scientificity and applicability of the field performance verification method proposed in the present application.

[0103] Figure 6 A structure diagram of a field verification system 600 of a converter transformer active defense device according to an embodiment of the present application. As shown in Figure 6 The field verification system 600 of the converter transformer active defense device provided by the embodiment of the present application includes a verification data determination module 601, a test data acquisition module 602, and a verification result determination module 603.

[0104] Preferably, the verification data determination module 601 is configured to determine the verification loop wiring mode, test process and verification item qualified criterion for different types of performance verification of the converter transformer active defense device.

[0105] Preferably, the different types of performance verification include: ultra-high frequency sensor performance verification, acoustic sensor performance verification, and high frequency sensor performance verification.

[0106] Preferably, for the ultra-high frequency sensor performance verification, the verification circuit wiring mode includes: when there is only one built-in sensor in the converter transformer, connecting a handheld ultra-high frequency signal generator to an external ultra-high frequency antenna, injecting a signal from the built-in sensor mounting flange joint, and connecting the built-in sensor to be verified to the active defense device to receive the signal; when there are multiple built-in sensors in the converter transformer, connecting two built-in sensors as a group, injecting an abrupt pulse signal through one of the sensors using a handheld ultra-high frequency signal generator, and connecting the built-in sensor to be verified to the active defense device to receive the signal.

[0107] The test process includes: when there is only one built-in sensor in the converter transformer, gradually increasing the injected signal amplitude in the range of 1V-100V, adjusting the angle of the external antenna at the flange joint, and recording whether the active defense device can normally detect the injected pulse signal with an amplitude higher than 2:1 signal-to-noise ratio.

[0108] When there are multiple built-in sensors in the converter transformer, injecting an abrupt pulse signal with an amplitude of 50V through one of the sensors using a handheld ultra-high frequency signal generator, connecting the built-in sensor to be verified to the active defense device, and recording whether the active defense device can normally detect the injected pulse signal with an amplitude higher than 2:1 signal-to-noise ratio; and gradually increasing the injected signal amplitude in the range of 1V-100V until the active defense device detects signal saturation, and according to the response of the active defense device corresponding to each injected signal amplitude.

[0109] The verification item qualification criterion includes: when there is only one built-in sensor in the converter transformer, determining whether the active defense device can display the signal with a 2:1 signal-to-noise ratio by adjusting the injected signal amplitude and the antenna angle.

[0110] When there are multiple built-in sensors in the converter transformer, determining whether the active defense device can display the signal with a signal-to-noise ratio exceeding 2:1 when a 50V signal is injected through one of the built-in sensors; and whether the ultra-high frequency sensor amplitude linearity meets the requirement that the amplitude display within the response dynamic range and the excitation signal linearity error is ≤20%.

[0111] Preferably, for acoustic sensor performance verification, the wiring method of the verification circuit includes: using a standard acoustic-electric transducer with known performance as an excitation source, setting it on the outer wall of the fuel tank close to the built-in acoustic sensor to be tested; during calibration, injecting a sine wave signal into the standard acoustic-electric transducer at the sensor deployment location through a handheld acoustic signal generator; and outputting the optical output signal of the sensor to be tested to the active defense device through an acoustic demodulation unit; and receiving the signal through the active defense device.

[0112] The testing process includes: first, injecting a sinusoidal acoustic signal with an amplitude of 10V and a frequency of 30kHz into the tank wall through an acoustic-electric transducer, measuring and recording the amplitude of the sensor's response signal, and recording whether the active defense device can normally detect the injected sinusoidal signal with an amplitude higher than 2:1 signal-to-noise ratio; and gradually increasing the amplitude of the injected signal in increments of 1V within a range of 1V-20V until the active defense device detects signal saturation, recording the response of the active defense device at each injected signal amplitude, and plotting the input response curve.

[0113] The qualification criteria for the verification items include: determining whether the injected signal can respond normally, whether the active defense device can display the signal with a signal-to-noise ratio of 2:1 when a 10V signal is injected, and whether the linearity error between the amplitude display and the excitation signal within the response dynamic range is ≤20% based on the input response curve.

[0114] Preferably, for high-frequency sensor performance verification, the wiring method of the verification circuit includes:

[0115] High-frequency sensor performance calibration is performed by coupling the excitation signal through a handheld high-frequency signal generator and an excitation sensor via a grounding wire. The high-frequency partial discharge sensor being calibrated is then connected to an active defense device to receive the signal.

[0116] The testing process includes: First, connecting the excitation sensor to the grounding wire of the core or clamp of the sensor under test, injecting a 20nC signal using a handheld high-frequency signal generator, and connecting the sensor signal to the active defense device; Second, recording whether the active defense device can detect the injected pulse signal normally with an amplitude higher than 2:1 signal-to-noise ratio, and recording the data; Finally, gradually increasing the amplitude of the injected signal within the range of 20pC-100nC until the active defense device detects the signal saturation, recording the response of the active defense device at each injected signal amplitude, and plotting the input response curve.

[0117] The check item qualified criterion comprises: judging whether the injected signal can normally respond, whether the active defense device can display the signal with a 2:1 signal-to-noise ratio when the 20nC signal is injected, and whether the linear error between the amplitude display in the response dynamic range and the excitation signal is less than or equal to 20% based on the input response curve.

[0118] Preferably, the test data acquisition module 602 is configured to, for any type of performance check, determine a check loop based on the check loop wiring mode, perform a test based on the test process, and acquire test data.

[0119] Preferably, the check result determination module 603 is configured to, for any type of performance check, determine a check result based on the test data and the corresponding check item qualified criterion.

[0120] The system further comprises:

[0121] The data display module is configured to, when the active defense device does not have a data display function, access the active defense device data to a debugging notebook or a display screen to present the data, and when the sensor does not have a condition of being accessed to the active defense device to perform synchronous inspection, use an oscilloscope to replace the signal acquisition and display function of the active defense device to perform individual check on the sensor.

[0122] The field check system 600 of the converter transformer active defense device of the embodiment of the application corresponds to the field check method 100 of the converter transformer active defense device of another embodiment of the application, and will not be described here.

[0123] The application has been described by referring to a few embodiments. However, it is well understood by those skilled in the art that other embodiments, except for the above disclosed embodiments of the application, are equivalent to fall within the scope of the application.

[0124] Generally, all the terms used in the application are interpreted according to their common meanings in the technical field, unless otherwise explicitly defined therein. All references to "a / the / that [device, component, etc.]" are interpreted as at least one instance of the device, component, etc., unless otherwise explicitly stated. The steps of any method disclosed herein do not necessarily have to be run in the exact order disclosed, unless explicitly stated.

[0125] Those skilled in the art will appreciate that embodiments of the application can be devised for a method, a system, or a computer program product. Accordingly, the present application can be embodied in the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application can take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) embodying computer readable program code.

[0126] The present application is described in reference to the flowchart illustrations and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in one or more of the flowchart illustrations and / or block diagrams. Figure 1 means for (an apparatus including one or more of the flowchart illustrations and / or block diagrams and their associated operations) to implement one or more of the flowchart illustrations and / or block diagrams.

[0127] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in one or more of the flowchart illustrations and / or block diagrams. Figure 1 means for (an apparatus including one or more of the flowchart illustrations and / or block diagrams and their associated operations) to implement one or more of the flowchart illustrations and / or block diagrams.

[0128] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in one or more of the flowchart illustrations and / or block diagrams. Figure 1 means for (an apparatus including one or more of the flowchart illustrations and / or block diagrams and their associated operations) to implement one or more of the flowchart illustrations and / or block diagrams.

[0129] Finally, it should be noted that the above-mentioned embodiments are merely intended for describing and illustrating, not limiting, the technical solutions of the present application. Although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application, and any modifications or replacements of the specific embodiments of the present application without departing from the spirit and scope of the present application should be covered within the protection scope of the present application.

Claims

1. A field verification method of a converter transformer active defense device, characterized in that, The method comprises: determining a check loop wiring mode, a test process and a check item qualified criterion of different types of performance checks of the converter transformer active defense device; for any type of performance check, determining a check loop based on the check loop wiring mode, and testing based on the test process to obtain test data; for any type of performance check, determining a check result based on the test data and the corresponding check item qualified criterion.

2. The method of claim 1, wherein, The different types of performance checks include: ultrahigh frequency sensing performance check, acoustic sensing performance check and high frequency sensing performance check.

3. The method of claim 2, wherein, For the ultrahigh frequency sensing performance check, the check loop wiring mode comprises: when there is only one built-in sensor in the converter transformer, connecting a handheld ultrahigh frequency signal generator to an external ultrahigh frequency antenna, injecting a signal from the built-in sensor mounting flange joint, and connecting the built-in sensor to be checked to the active defense device to receive the signal; when there are multiple built-in sensors in the converter transformer, connecting two built-in sensors as a group, injecting an abrupt pulse signal through one of the sensors by using a handheld ultrahigh frequency signal generator, and connecting the built-in sensor to be checked to the active defense device to receive the signal; The test process comprises: when there is only one built-in sensor in the converter transformer, gradually increasing the injected signal amplitude in the range of 1V-100V, adjusting the angle of the external antenna at the flange joint, and recording whether the active defense device can normally detect the injected pulse signal with an amplitude higher than 2:1 signal-to-noise ratio; when there are multiple built-in sensors in the converter transformer, injecting an abrupt pulse signal with an amplitude of 50V through one of the sensors by using a handheld ultrahigh frequency signal generator, connecting the built-in sensor to be checked to the active defense device, and recording whether the active defense device can normally detect the injected pulse signal with an amplitude higher than 2:1 signal-to-noise ratio; and gradually increasing the injected signal amplitude in the range of 1V-100V until the active defense device detects the signal saturation, and determining the response of the active defense device corresponding to each injected signal amplitude; The check item qualified criterion comprises: when there is only one built-in sensor in the converter transformer, determining whether the active defense device can display the signal with a 2:1 signal-to-noise ratio by adjusting the injected signal amplitude and the antenna angle; when there are multiple built-in sensors in the converter transformer, determining whether the active defense device can display the signal with a signal-to-noise ratio higher than 2:1 when a 50V signal is injected through one of the built-in sensors; and whether the ultrahigh frequency sensing amplitude linearity satisfies the amplitude display and excitation signal linearity error ≤20% in the response dynamic range.

4. The method of claim 2, wherein, For acoustic sensing performance verification, the verification circuit wiring mode comprises: a performance known standard acoustic electric transducer is set as an excitation source on the tank outer wall close to the built-in acoustic sensor to be tested; during calibration, a handheld acoustic signal generator is used to inject a sinusoidal wave signal to the standard acoustic electric transducer at the sensor deployment position, and an acoustic demodulation unit is used to output the optical output signal of the sensor to be tested to the active defense device, and the active defense device receives the signal; The test process comprises: first, an acoustic electric transducer is used to inject a sinusoidal acoustic signal with an amplitude of 10V and a frequency of 30kHz to the tank wall, the response signal amplitude of the sensor is measured and recorded, and whether the active defense device can normally detect the injected sinusoidal signal with a signal-to-noise ratio higher than 2:1 is recorded; and in the range of 1V-20V, the injected signal amplitude is gradually increased by 1V each time until the active defense device detects signal saturation, the response of the active defense device at each injected signal amplitude is recorded, and an input response curve is drawn; The verification item qualification criterion comprises: judging whether the injected signal can normally respond, whether the active defense device can display the signal with a signal-to-noise ratio of 2:1 when the 10V signal is injected, and whether the amplitude display in the response dynamic range and the linearity error of the excitation signal are less than or equal to 20% based on the input response curve.

5. The method of claim 2, wherein, For high-frequency sensing performance verification, the verification circuit wiring mode comprises: High-frequency sensing performance calibration is performed by coupling an excitation sensor to the ground line of a converter transformer through a handheld high-frequency signal generator, and the high-frequency partial discharge sensor to be verified is connected to the active defense device to receive the signal; The test process comprises: first, the excitation sensor is clamped to the core or the ground line of the converter transformer where the sensor to be verified is located, a 20nC signal is injected by a handheld high-frequency signal generator, and the signal of the sensor to be verified is connected to the active defense device; second, whether the active defense device can normally detect the injected pulse signal with a signal-to-noise ratio higher than 2:1 is recorded on the active defense device, and data recording is completed; finally, in the range of 20pC-100nC, the injected signal amplitude is gradually increased until the active defense device detects signal saturation, the response of the active defense device at each injected signal amplitude is recorded, and an input response curve is drawn; the verification item qualification criterion comprises: judging whether the injected signal can normally respond, whether the active defense device can display the signal with a signal-to-noise ratio of 2:1 when the 20nC signal is injected, and whether the amplitude display in the response dynamic range and the linearity error of the excitation signal are less than or equal to 20% based on the input response curve.

6. The method according to claim 3, 4 or 5, characterized in that The method further comprises: When the active defense device does not have data display function, the data of the active defense device is connected to a debugging notebook or a display screen for data presentation; when the sensor does not have the condition of being connected to the active defense device for synchronous verification, an oscilloscope is used to replace the signal acquisition and display function of the active defense device to perform individual verification on the sensor.

7. A field calibration system for an active defense device of a converter transformer, characterized in that The system comprises: The check data determination module is configured to determine a check loop wiring mode, a test process, and a check item qualified criterion for different types of performance checks on the converter transformer active defense device. The test data acquisition module is configured to, for any type of performance check, determine a check loop based on the check loop wiring mode, and perform a test based on the test process to acquire test data. The check result determination module is configured to, for any type of performance check, determine a check result based on the test data and the corresponding check item qualified criterion.

8. The system of claim 7, wherein, The different types of performance checks include: ultrahigh frequency sensor performance check, acoustic sensor performance check, and high frequency sensor performance check.

9. The system of claim 8, wherein, For the ultrahigh frequency sensor performance check, the check loop wiring mode includes: when there is only one built-in sensor in the converter transformer, connecting a handheld ultrahigh frequency signal generator to an external ultrahigh frequency antenna, injecting a signal from the built-in sensor mounting flange joint, and connecting the built-in sensor to be checked to the active defense device to receive the signal; when there are multiple built-in sensors in the converter transformer, connecting two built-in sensors as a group, injecting an impulse signal through one of the sensors by using the handheld ultrahigh frequency signal generator, and connecting the built-in sensor to be checked to the active defense device to receive the signal. The test process includes: when there is only one built-in sensor in the converter transformer, gradually increasing the injected signal amplitude in the range of 1V-100V, adjusting the angle of the external antenna at the flange joint, and recording whether the active defense device can normally detect the injected pulse signal at an amplitude higher than 2:1 signal-to-noise ratio; when there are multiple built-in sensors in the converter transformer, injecting an impulse signal with an amplitude of 50V through one of the sensors by using the handheld ultrahigh frequency signal generator, connecting the built-in sensor to be checked to the active defense device, and recording whether the active defense device can normally detect the injected pulse signal at an amplitude higher than 2:1 signal-to-noise ratio; and gradually increasing the injected signal amplitude in the range of 1V-100V until the active defense device detects a saturated signal, and determining the response of the active defense device corresponding to each injected signal amplitude; The check item qualified criterion includes: when there is only one built-in sensor in the converter transformer, determining whether the active defense device can display the signal at a 2:1 signal-to-noise ratio by adjusting the injected signal amplitude and the antenna angle; when there are multiple built-in sensors in the converter transformer, determining whether the active defense device can display the signal at a signal-to-noise ratio higher than 2:1 when a 50V signal is injected through one of the built-in sensors; and determining whether the ultrahigh frequency sensor amplitude linearity satisfies the linearity error ≤20% between the amplitude display and the excitation signal in the response dynamic range.

10. The system of claim 8, wherein, For acoustic sensing performance verification, the verification circuit wiring mode comprises: a standard acoustic-electric transducer with known performance is set on the outer wall of the oil tank near the built-in acoustic sensor to be tested, during calibration, a handheld acoustic signal generator is used to inject a sinusoidal wave signal to the standard acoustic-electric transducer at the sensor deployment position, and the optical output signal of the sensor to be tested is output to the active defense device through an acoustic demodulation unit, and the signal is received by the active defense device; The test process comprises: first, a sinusoidal acoustic signal with an amplitude of 10V and a frequency of 30kHz is injected into the oil tank wall by the acoustic-electric transducer, the response signal amplitude of the sensor is measured and recorded, and whether the active defense device can normally detect the injected sinusoidal signal with a signal-to-noise ratio higher than 2:1 is recorded; and the injected signal amplitude is gradually increased in steps of 1V in the range of 1V-20V, until the active defense device detects signal saturation, the response of the active defense device at each injected signal amplitude is recorded, and an input response curve is drawn; The verification item qualification criterion comprises: judging whether the injected signal can be normally responded, whether the active defense device can display the signal with a signal-to-noise ratio of 2:1 when the 10V signal is injected, and whether the linearity error of the amplitude display within the response dynamic range and the excitation signal is ≤20% based on the input response curve.

11. The system of claim 8, wherein, For high-frequency sensing performance verification, the verification circuit wiring mode comprises: High-frequency sensing performance calibration is performed by coupling the excitation signal through the grounding line of the handheld high-frequency signal generator and the excitation sensor, and the high-frequency local discharge sensor to be verified is connected to the active defense device to receive the signal; The test process comprises: first, the excitation sensor is clamped to the grounding line of the iron core or clamp where the sensor to be verified is located, a 20nC signal is injected by the handheld high-frequency signal generator, and the signal of the sensor to be verified is connected to the active defense device; second, whether the active defense device can normally detect the injected pulse signal with a signal-to-noise ratio higher than 2:1 is recorded on the active defense device, and data recording is done; finally, the injected signal amplitude is gradually increased in the range of 20pC-100nC, until the active defense device detects signal saturation, the response of the active defense device at each injected signal amplitude is recorded, and an input response curve is drawn; The verification item qualification criterion comprises: judging whether the injected signal can be normally responded, whether the active defense device can display the signal with a signal-to-noise ratio of 2:1 when the 20nC signal is injected, and whether the linearity error of the amplitude display within the response dynamic range and the excitation signal is ≤20% based on the input response curve.

12. The system according to claim 9, 10 or 11, characterized in that The system further comprises: A data display module is used to present the data of the active defense device on a debugging notebook or a display screen when the active defense device does not have data display function; and when the sensor does not have the condition to be connected to the active defense device for synchronous verification, an oscilloscope is used to replace the signal acquisition and display function of the active defense device to perform individual verification on the sensor.

Images