A low‐cost and high‐performance self‐trigger method for high‐voltage transient measurement

Abstract

Stable triggering of acquisition devices is critical to accurately measure electromagnetic transients, especially for very fast transient overvoltages (VFTOs). A highly stable and lowcos t self-trigger method for transient measurement is proposed. An integrated low-voltage arm module was developed to synchronously realise the triggering and VFTO measurement. The trigger branch was developed using a high-pass filter. This component obtained the high-frequency component of the VFTO to trigger the oscilloscope. The trigger branch was integrated with the measurement branch through an impedance converter. An attenuator was implemented before the impedance converter to avoid overvoltage damage to the chip. The circuit parameters of the attenuator were optimised to alleviate the disturbance of the measurement branch. The calibration results demonstrated that the �1 dB bandwidth of the measurement branch in this system ranged from 11.8 Hz to 105 MHz. The low cutoff frequency of the trigger branch was 710 Hz. The VFTO waveforms generated by the operation of a disconnector in a real 252 kV gas insulated switchgear were measured using the proposed system. The test results verified that the self-trigger measurement system can provide stable trigger signals and accurately measure the VFTO waveforms.

Evaluation method for electromagnetic interference complexity of high voltage switch based on feature extraction and GCC‐GRU network

“…Later, Pinnegar et al [39] introduced the adjustment factor δ into the Gaussian window function. Rewrite formula ( 6) to (7).…”

“…Therefore, scholars have extensively studied and hope to use complexity to uniformly characterise the severity of the electromagnetic environment. Evaluating the complexity of electromagnetic interference environments has become an urgent issue in current research [7].…”

Mechanism of plasma chemistry in CO2 hydrogenation using a dielectric barrier discharge reactor

“…During the plasma discharge process, changes in the background temperature may affect many physical properties of the plasma reactors. [29][30][31][32][33][34][35][36][37][38] To determine its contribution to the physical properties, the effect of temperature on the Lissajous graph was investigated in CO 2 /H 2 mixture. Typical Lissajous graphs under different temperatures at U peak = 6 kV and P dis = 10 W are shown in Figure 2.…”

Measurement of Transient Overvoltages by Capacitive Electric Field Sensors

“…Using electric field sensors for voltage measurement is another solution that has been the subject of research and further improvement [22][23][24][25][26][27][28][29][30][31][32][33]. In [25][26][27][28], the authors propose voltage calculation through inversion or integration of the measured electric field.…”