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The PD detection sensitivity is linked to the ratio of the coupling capacitor to the capacitance of the test object, as an increase in sample capacitance eventually reduces detection sensitivity. In other words, by increasing the coupling capacitance, it is possible to increase the measurement sensitivity and SNR.
In the test system, the capacitor voltage and arm current waveforms within 1 s are extracted. The voltage and current waveforms in one cycle are randomly selected to calculate the capacitance. As shown in Fig. 7, when the sampling points are 22, 82, 116, and 357, the SM is inserted into the system, and the capacitor voltage rises.
The largest error was less than 0.6% under different power levels. The proposed method depends on the high sampling accuracy and bandwidth of the inductance arm current and capacitance voltage sensors, which significantly decrease with increases in the high-power level. This leads to large deviations in the monitoring results.
The VHF capacitive coupler technique was investigated by Tian et al. to detect and diagnose PD in cables, especially at cable joints. The PD location is detected using the time of arrival technique, and the suggested approach can capture PDs smaller than 3 pC.
The value of the threshold H is related to the fluctuation level of the capacitor voltage. If it is too small, it may lead to misidentification. If it is too large, it may lead to misidentification. Therefore, it is set to H = 10. Capacitor voltage and arm current waveforms
Transient impacts on high voltage cable systems were studied in the laboratory using a PD monitoring system developed by Jiayang Wu et al. Investigators concluded that the adopted measurement is capable of identifying and measuring PD in the cable joints under the impulse circumstances, both without and with AC superposition .
This paper reports on a new user-friendly and effective way to carry out PD test of HV power capacitor. This system contains a supply module, a specially made sampling impedance and a …
as high dielectric constant; higher dielectric constant indi-cates higher capacitance. Consequently, the voltage output Fig. 2. Experimental setup for the proposed parallel-plate capacitor sensor …
However, the voltage measurement circuit highly depends on the architecture of the power converters in terms of topology and control. To solve the problem, authors in [] propose a converter-level method for measuring the …
Depending on how large we expect the voltage to scale, we need a capacitor with a voltage rating matched for that voltage. So we can decide a rough estimate for how high we believe the …
In this paper, we introduce a method for performing unbalance calculations for high-voltage capacitor banks. We consider all common bank configurations and fusing …
According to the symptoms of capacitor fault, combined with a large number of data related to the system in actual operation and the related data in parallel capacitors, …
Fig. 2. Setup for testing two capacitor units in the lab. The PD sensors, the current probes I 1,2, the voltage divider V and the thermographic camera T are indicated. Fig. …
The adopted methodology was the detection of partial discharges (PD) during a special applied voltage test with the monitoring of temperature and capacitance values. To accomplish this …
1 Introduction. High-voltage technology is being increasingly used in a variety of applications such as medical imaging, particle accelerators, and radar transmitters in the last …
The most common ones are a) the coupling capacitor, and b) the high frequency current transformer (HFCT). a) Coupling capacitor The coupling capacitor is by far the most commonly …
High-voltage capacitor technology is reviewed, and the characteristics of partial discharges (PDs) in these capacitors, the PD''s ultrasonic signatures, and the...
Capacitive coupling, which consists of a high-voltage capacitor and a low-voltage coupling device connected in series, is frequently utilized for PD detection [24]. Current pulses …
The on-line monitoring device of the high-voltage parallel capacitor can achieve early failure early warning of the high-voltage parallel capacitor device, accuracy of the early warning is …
the outer switches turns OFF, its parallel capacitor is charged, and meanwhile the parallel capacitor of the other outer switch is discharged through the flying capacitor so that zero …
The utility model discloses high-voltage parallel capacitor on-line monitoring systems, including on-Line Monitor Device, temperature sensor, master ethernet connector, bluetooth...
To identify abnormal capacitors, a condition monitoring method for capacitors is proposed in this paper using the cumulative sum detection of the sliding window algorithm. …
High-voltage capacitor technology is reviewed, and the characteristics of partial discharges (PDs) in these capacitors, the PD''s ultrasonic signatures, and the...
The evaluation and predictive diagnosis of high voltage power capacitors is a subject of great importance. Internal dielectric faults in power capacitors can affect the
2Capacitor Quality Inspection, Wuxi SUNKING Power Capacitor Co. Ltd., Wuxi, People''s Republic of China E-mail: liangyanping2010@126 Abstract: Power capacitor works in …
The most common circuit for measuring PD is shown in the top left of Figure 1 that image, the measuring impedance Z m is shown in series with C k, the coupling …