Application Cases

Experiment Name: Performance Testing of Distribution Network Induced Lightning Overvoltage Monitoring Device

Experiment Purpose: To build laboratory and field test platforms to test the performance of sensing insulators; to simulate low-power energy harvesting modules and test energy harvesting under different ceramic capacitor values and energy efficiency improvement measures, providing references for the design of energy harvesting insulators; to test the energy harvesting power of energy harvesting insulators through the field test platform; and finally, to integrate relevant modules and conduct joint debugging tests on the overall performance of the monitoring device under three conditions: normal line operation, single-phase instantaneous grounding, and single-phase complete grounding.

Testing Equipment: Power amplifier, arbitrary function generator, oscilloscope, etc.

Experiment Process:

Figure 1: Schematic Diagram of High-Frequency Response Test Wiring for Sensing Insulators

To test the high-frequency response characteristics of ceramic capacitor sensing insulators, the experiment uses an arbitrary function generator as a voltage source to produce a voltage signal, which is amplified by a high-voltage amplifier and then split by both a standard voltage divider and a ceramic capacitor voltage divider before being input into the oscilloscope. By adjusting the waveform and frequency range of the arbitrary function generator, the response of the sensing insulator under different frequencies and waveforms is tested.

Figure 2: Sine Wave Response of Sensing Insulator

Channel 1 of the oscilloscope is connected to the voltage output after division by the sensing insulator, and Channel 2 is connected to the voltage output after division by the standard voltage divider, with a division ratio of 350:1 for the standard voltage divider. Figure 2 shows the test results obtained on the oscilloscope after the sine wave voltage signal is input by the arbitrary function generator and amplified by the high-voltage amplifier. Figures 2(a), (b), (c), and (d) show the sine wave frequency responses at 50Hz, 3kHz, 5kHz, and 10kHz, respectively, where the blue curve represents the input waveform and the red curve represents the output waveform of the sensing insulator. The test results show that the sensing insulator has a good sine wave output response at different frequencies, with no significant phase difference between the input and output waveforms.

Experimental Results:

Figure 3: High-Frequency Voltage Response of Sensing Insulator

Figure 3 shows the high-frequency voltage response of the sensing insulator, where Figures 3(a), (c), and (e) show the sine wave, square wave, and triangle wave voltage responses at 50Hz, and Figures 3(b), (d), and (f) show the sine wave, square wave, and triangle wave voltage responses at 3kHz, respectively. The blue curve represents the input waveform, and the red curve represents the output waveform of the sensing insulator. The test results show that the sensing insulator can still linearly output various types of voltage waveforms at high frequencies, with no significant phase difference, enabling the measurement of high-frequency voltages on power transmission lines.

Power Amplifier Recommendation: ATA-7010

Figure: Specification Parameters of the ATA-7010 High-Voltage Amplifier

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