Application Cases

Experiment Name: The Application of the ATA-2161 High-Voltage Amplifier in Non-Contact High-Voltage Detection Devices

Experiment Content:In this work, we propose a self-powered high-voltage monitoring device with strong interference resistance, namely the Maxwell displacement current-driven light-emitting diode (MDC-LED), which uses the light signal generated by the MDC-LED to judge changes in high-voltage signals. Simulations and experiments have proven that the MDC-LED can restructure the electric field near power lines into an approximately uniform electric field, exhibiting strong interference resistance. Due to the high sensitivity of the MDC-LED to alternating electric fields, a 2D-CNN model was designed to identify contamination on high-voltage lines with an accuracy of 94.67%. Additionally, a monitoring system was designed to detect the vibration frequency and amplitude of power lines.

Research Direction: Self-Powered Optoelectronic Devices

Testing Equipment:ATA-2161 high-voltage amplifier, signal generator, high-voltage generator, avalanche diode, oscilloscope, etc.

Experimental Process:

The MDC-LED is placed under a high-voltage line, with no electrical contact between the external electrode and the high-voltage line. The second electrode/LED/third electrode is sandwiched between the first and fourth electrodes, with air as the gap medium. Moreover, the electroluminescent properties of the LED are crucial for monitoring high-voltage signals. When a low-frequency electrical signal is transmitted through the high-voltage line, an alternating electric field is generated between the high-voltage line and the ground. This electric field is restructured by the first and fourth electrodes into an approximately uniform electric field, and the LED periodically emits light driven by the Maxwell displacement current. Due to the high sensitivity of the LED to dynamic potential differences, the voltage on the high-voltage line is directly reflected in the light signal.

Experimental Results:

The trend towards diversification and complexity in power systems has led to the integration of a large number of devices/loads with non-linear and unbalanced operating characteristics into the power grid, resulting in electrical contamination and a significant reduction in power supply efficiency. To demonstrate the ability of the MDC-LED to detect electrical signal contamination, we introduced fourth, sixth, and eighth harmonics (considered as high-frequency small signals) into the high-voltage signal to observe changes in the light-emitting waveform. When no harmonic contamination was introduced, only a single electroluminescence (EL) pulse could be observed. However, with the introduction of harmonics, the original light-emitting pulse split into multiple sub-pulses. The number, width, and peak of the sub-pulses varied with the type of electrical contamination.

Outdoor transmission lines, in addition to harmonic contamination, are inevitably subject to external vibration interference, such as disturbances caused by strong winds and human-induced shaking. In the experiment, a vibrator was used to induce high-voltage line vibrations within a frequency range of 0 Hz to 4 Hz. Then, by comparing the actual vibration frequency with the predicted vibration frequency using an algorithm, the envelope of the EL output was quantified, allowing for the correct distinction of vibration frequencies with an accuracy of 97.98%. Additionally, a detection system was developed to extract the vibration amplitude and frequency of the high-voltage line and to set reasonable thresholds to warn of abnormal operating conditions.

Power Amplifier Recommendation: ATA-2161 High-Voltage Amplifier

Figure: Performance Parameters of the ATA-2161 High-Voltage Amplifier

Xi'an Aigtek Electronics is a high-tech company specializing in the research, development, production, and sales of electronic measurement instruments such as power amplifiers, high-voltage amplifiers, power signal sources, preamplifiers for weak signals, high-precision voltage sources, and high-precision current sources. It provides users with competitive testing solutions. Aigtek has become a widely recognized supplier of instruments and equipment with a broad product line and considerable scale. Demo units are available for free trial.