Detection device accuracy verification system for lightning impulse voltage test

Abstract

The invention discloses a detection device accuracy verification system for a lightning impulse voltage test, and the system comprises a waveform generation terminal which is used for generating a first voltage wave according to a radar impulse voltage test parameter; the waveform adjuster is used for adjusting the amplitude and / or frequency of the first voltage wave to obtain a second voltage wave; the input end of the power amplifier is in communication connection with the output end of the waveform adjuster, and the power amplifier is used for performing power adjustment on the second voltage wave to generate a standard test wave; and the output end of the power amplifier is used for being connected with a to-be-verified detection device so as to provide standard test waves for verifying the measurement capability for the detection device. According to the verification system, the accuracy of the detection data of the detection device can be evaluated, in addition, different types of lightning impulse voltage waveforms can be generated, different verification requirements are met, special customization is not needed, assembly is convenient, the structure is simple and light, and the verification cost can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage electric power test equipment, and in particular to an accuracy verification system for a detection device used for a lightning impulse voltage test. Background Art

[0002] The lightning impulse voltage test is the main test for judging the insulation level of high-voltage electrical appliances. Its test waveform has the characteristics of wide frequency band, fast rise speed and short duration. During each test, the inspector shall adjust the resistance of the test circuit according to the capacitance and inductance of the sample to make the test waveform meet the current national standard GB / T16927.1-2011 and the international standard IEC60060-1:2010: the wavefront discharge time in the standard lightning impulse voltage 1.2 / 50μs should be 1.2μs±30%, and the expanded uncertainty of the wavefront time measurement shall not exceed 10% (the confidence level shall not be less than 95%). The lightning impulse voltage test has high requirements on the ability of the detection device to accurately measure parameters such as the wavefront time. If the wavefront time parameter is not accurately measured, it will seriously affect the determination of the test results and the verification of the insulation performance of the high-voltage electrical appliances, and then cause serious accidents such as power grid short circuits due to unexpected insulation damage. The generators used in existing lightning impulse voltage tests are large in size, complex in structure and very expensive. They are not convenient to transport and cannot be used for capability verification between multiple detection devices. In addition, the measurement accuracy test of a single detection device also requires standard measurement equipment to simultaneously measure the waveform for comparison, which is not only complicated to operate but also not conducive to reducing the test cost. Summary of the invention

[0003] The purpose of the present invention is to solve the deficiencies of the above technical problems and to provide a simplified and lightweight detection device accuracy verification system for lightning impulse voltage test, so as to verify the measurement capability of the detection device for lightning impulse voltage test.

[0004] In order to achieve the above object, the present invention provides a detection device accuracy verification system for lightning impulse voltage test, which comprises: A waveform generating terminal, which is used to generate a first voltage wave according to the radar impulse voltage test parameters; a waveform adjuster, whose input end is communicatively connected to the output end of the waveform generating terminal, and the waveform adjuster is used to adjust the amplitude and / or frequency of the first voltage wave to obtain a second voltage wave; a power amplifier, whose input end is communicatively connected to the output end of the waveform adjuster, and is used to adjust the power of the second voltage wave to generate a standard test wave; The output end of the power amplifier is used to connect to the detection device to be verified, so as to provide the detection device with the standard test wave for measuring capability verification.

[0005] Preferably, the waveform adjuster and the power amplifier are connected via a first coaxial cable.

[0006] Preferably, the output impedance of the waveform adjuster is adjustable.

[0007] Preferably, the power amplifier and the detection device are connected via a second coaxial cable or a shielded twisted pair cable.

[0008] Preferably, the output impedance of the power amplifier is adjustable.

[0009] Preferably, the test parameters include wavefront time.

[0010] Preferably, the waveform generating terminal generates the first voltage waveform according to the following formula: ,

[0011] Wherein, A is the preset waveform amplitude, t is the wavefront time, t1 and t2 are preset time coefficients, and e is a natural constant.

[0012] Compared with the prior art, the verification system provided by the above technical solution of the present invention provides the required standard test wave for the detection device used for lightning impulse voltage test through the cooperation of the waveform generation terminal, the waveform adjuster and the power amplifier, so that the accuracy of the detection data of the detection device can be evaluated by comparing the data detected by the detection device with the standard test wave. The verification system can flexibly set the waveform parameters through the waveform generation terminal, so as to generate different types of lightning impulse voltage waveforms to meet different verification requirements; in addition, the various functional components constituting the verification system are conventional mature components, which do not need to be specially customized, are easy to assemble, have a simple and light structure, and can effectively reduce the verification cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a principle structure diagram of the verification system in an embodiment of the present invention. DETAILED DESCRIPTION

[0014] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0015] This embodiment discloses a detection device accuracy verification system, such as Figure 1 , wherein the detection device 4 is used to measure the voltage wave in the lightning impulse voltage test. The verification system can be used to verify whether the measurement accuracy of the detection device 4 meets the requirements. If not, the relevant working parameters of the detection device 4 can be adjusted to make the accuracy of the detection result of the detection device 4 meet the expectations, thereby making the test result consistent with the actual situation.

[0016] The verification system in this embodiment includes a waveform generating terminal 1 , a waveform adjuster 2 and a power amplifier 3 .

[0017] The waveform generating terminal 1 is used to generate the first voltage wave according to the radar impulse voltage test parameters. The waveform generating terminal 1 is an electronic terminal installed with a waveform generating program (such as waveform design software such as WaveDrom, Visio, Timegen, etc.), such as a PC or a mobile terminal.

[0018] The input end of the waveform adjuster 2 is communicatively connected to the output end of the waveform generating terminal 1 , and the waveform adjuster 2 is used to adjust the amplitude and / or frequency of the first voltage wave to obtain a second voltage wave.

[0019] The input end of the power amplifier 3 is communicatively connected to the output end of the waveform adjuster 2 for adjusting the power of the second voltage wave to generate a standard test wave.

[0020] The output end of the power amplifier 3 is used to connect to the detection device 4 to be verified, so as to provide the detection device 4 with the standard test wave for measuring capability verification.

[0021] The working principle of the verification system is as follows: the waveform generating terminal 1, the waveform adjuster 2 and the power amplifier 3 cooperate to provide the required standard test wave for the detection device 4. The detection device 4 outputs the detection value of the standard test wave, and then compares the detection value with the standard test wave to determine whether the accuracy of the detection device 4 meets expectations.

[0022] It can be seen from this that the detection capability of the detection device 4 can be verified through the verification system, and the generated standard test wave can be provided to multiple detection devices 4 at the same time to verify the multiple detection devices 4.

[0023] In addition, the verification system can flexibly set waveform parameters through the waveform generation terminal 1, thereby generating different types of lightning impulse voltage waveforms to meet different verification requirements and is easy to use.

[0024] Furthermore, all the functional components that make up the verification system are conventional and mature components. They do not need to be specially customized, are easy to assemble, have a simple and lightweight structure, and can effectively reduce verification costs.

[0025] On the other hand, the waveform adjuster 2 is connected to the power amplifier 3 via a first coaxial cable, and the power amplifier 3 is connected to the detection device 4 via a second coaxial cable or a shielded twisted pair.

[0026] In order to facilitate the effective transmission of the communication signal, the output impedance of the waveform adjuster 2 is adjustable, so that during assembly, the output impedance of the waveform adjuster 2 can be adjusted according to the input impedance of the power amplifier 3 so that the two are matched, so that the second voltage wave is effectively transmitted to the power amplifier 3. Similarly, the output impedance of the power amplifier 3 is adjusted according to the input impedance of the detection device 4 so that the two are matched, so that the standard test wave is effectively transmitted to the detection device 4.

[0027] On the other hand, the test parameters include wavefront time. "Wavefront time" is an important parameter that describes the rising speed of the voltage waveform. In layman's terms, it represents the time required from the beginning of the voltage rise to reaching 90% of the peak value, usually expressed in microseconds (μs). Therefore, in the waveform generating terminal 1, the required wavefront time is set to generate the first voltage wave.

[0028] In this regard, the waveform generating terminal 1 generates the first voltage waveform according to the following formula: ,

[0029] Wherein, A is the preset waveform amplitude, t is the wavefront time, t1 and t2 are preset time coefficients, and e is a natural constant.

[0030] Specifically, the usage process of the above verification system is as follows: First, link the waveform generating terminal 1, the waveform adjuster 2, the power amplifier 3, and the detection device 4. Adjust the output impedance of the waveform adjuster 2 and the power amplifier 3 so that the output impedance of the waveform adjuster 2 matches the input impedance of the power amplifier 3, and the output impedance of the power amplifier 3 matches the input impedance of the detection device 4. And adjust the amplitude of the waveform output of the waveform adjuster 2 to 10V, the frequency to 10kHz, and the amplification factor of the power amplifier 3 to 10.

[0031] Then, in the waveform generating terminal 1, the waveform amplitude A is set to 10, the standard lightning impulse voltage waveform wavefront time t is 1.2 μs (or the non-standard lightning impulse voltage waveform wavefront time t is 0.9 μs), and the time coefficients t1 and t2, as well as the appropriate waveform data length, are configured to generate the first voltage waveform. , and Import into Waveform 2.

[0032] The waveform adjuster 2 adjusts the amplitude and frequency of the first voltage wave to output a second voltage wave to the power amplifier 3. The power amplifier 3 amplifies the second voltage wave to generate a standard test wave, and inputs the standard test wave into the detection device 4.

[0033] Record the wavefront time and amplitude of the lightning impulse voltage waveform measured by the detection device 4, measure multiple times, compare whether the multiple measurement values ​​are stable, and compare the stabilized measurement values ​​with the set wavefront time and / or amplitude (after adjustment by the waveform adjuster 2). If the standard requirements are met, it means that the measurement capability of the detection device 4 meets the requirements.

[0034] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A detection device accuracy verification system for lightning impulse voltage test, characterized in that: include: A waveform generating terminal, which is used to generate a first voltage wave according to the radar impulse voltage test parameters; a waveform adjuster, whose input end is communicatively connected to the output end of the waveform generating terminal, and the waveform adjuster is used to adjust the amplitude and / or frequency of the first voltage wave to obtain a second voltage wave; a power amplifier, whose input end is communicatively connected to the output end of the waveform adjuster, and is used to adjust the power of the second voltage wave to generate a standard test wave; The output end of the power amplifier is used to connect to the detection device to be verified, so as to provide the detection device with the standard test wave for measuring capability verification.

2. The detection device accuracy verification system according to claim 1, characterized in that: The waveform adjuster is connected to the power amplifier via a first coaxial cable.

3. The detection device accuracy verification system according to claim 2, characterized in that: The output impedance of the waveform adjuster is adjustable.

4. The detection device accuracy verification system according to claim 1, characterized in that: The power amplifier and the detection device are connected via a second coaxial cable or a shielded twisted pair.

5. The detection device accuracy verification system according to claim 4, characterized in that: The output impedance of the power amplifier is adjustable.

6. The detection device accuracy verification system according to claim 1, characterized in that: The test parameters include wavefront time.

7. The detection device accuracy verification system according to claim 6, characterized in that: The waveform generating terminal generates the first voltage waveform according to the following formula , Wherein, A is the preset waveform amplitude, t is the wavefront time, t1 and t2 are preset time coefficients, and e is a natural constant.

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