Application Cases

In power systems, the accurate measurement of voltage parameters is crucial for the stable operation of the grid. Traditional 10kV distribution network overhead transmission lines commonly use electromagnetic voltage transformers for voltage measurement. However, due to the presence of iron cores or inductive windings, electromagnetic voltage transformers are bulky and costly. They also face technical challenges such as core saturation and ferromagnetic resonance overvoltage, making them less suitable for the development needs of modern power grids. In light of this, a smart insulator voltage sensor based on the principle of electric field coupling has been designed. By embedding a voltage sensing unit inside the insulator and using the coupling capacitance formed between electrodes to measure the voltage to be tested through voltage division, this method does not rely on magnetic cores or inductive windings and does not require complex insulation structures. It offers a wider measurement bandwidth and dynamic range, and has the advantages of small size, low cost, and easy installation.

Regarding experimental research on smart insulator voltage sensors, the ATA-4000 series of high-voltage power amplifiers from Antai Electronics has a maximum output voltage of 310Vp-p, which meets the voltage requirements of most smart insulator voltage sensor technologies available on the market.

Experiment Name: Smart Insulator Voltage Sensor Experiment

Experiment Principle: The signal generator inputs a signal and connects its output voltage to the high-voltage power amplifier. After amplification by the power amplifier, the output is connected to the high-voltage electrode of the sensor prototype. Simultaneously, an oscilloscope probe is used to measure the input voltage at the high-voltage electrode of the sensor and the output voltage after voltage division processing by the sensor prototype.

Experiment Block Diagram:

Experiment Photographs:

Experiment Process: The signal generator produces voltages of the same amplitude but different frequencies, and connects the output voltage to the high-voltage power amplifier. After amplification by the power amplifier, the output is connected to the high-voltage electrode of the sensor prototype. Simultaneously, an oscilloscope probe is used to measure the input voltage at the high-voltage electrode of the sensor and the output voltage after voltage division processing by the sensor prototype. A logarithmic frequency scan is performed in the frequency range of 10Hz to 1MHz.

Application Directions: Transformer core loss, integration of primary and secondary equipment, intelligent voltage sensing, power frequency withstand voltage and partial discharge

Application Scenarios: Power frequency withstand voltage and partial discharge, integration of primary and secondary equipment, smart insulators, finite element simulation

Product Recommendation: ATA-4000 Series High-Voltage Power Amplifiers

Figure: Specifications of the ATA-4000 Series High-Voltage Power Amplifiers