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Introduction
Our current research interest is in the development of sensors to detect partial discharges on high voltage power cables. The main goal is to achieve maximum sensitivity at the lowest possible cost. The sensors are based on an inductive approach (known as high-frequency Current Transformer).
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Publications
Publications (11)
This article deals with partial discharge (PD) measurement on power cables while they are in operation (online monitoring). In terms of sensitivity, high-frequency current transformers (HFCTs) are the most suitable sensors for this task, but they are prone to magnetic saturation when monitoring power cables online. To counteract saturation, the mag...
When using high-frequency current transformers (HFCT) to measure partial discharges (PD) on power cables, core saturation caused by the 50 Hz operating current of the power cable is a major problem. Saturation leads to nonlinearity in the transfer function of the HFCT sensor and significantly reduces its sensitivity to the PD signals. To avoid magn...
High-frequency current transformers (HFCT) are well suited as sensors for measuring transient current signals on power cables, such as partial discharges (PD). If the HFCT is well designed and its measurement bandwidth matches the bandwidth of the signal to be measured, high sensitivities can be achieved. However, optimizing the HFCT design for a s...
With the help of a simulation model, the transmission of partial discharges (PD) on medium voltage cables is investigated. During their transmission to a measuring device, bandwidth and amplitude of the initial PD decrease due to attenuation and dispersion. Efficient PD detectors need only be sensitive in the remaining bandwidth. In many previous p...
Medium voltage cables are poor transmitters of signals with high frequency spectrum such as partial discharges. The propagating signals are strongly attenuated and distorted depending on the transmitted distance. In order to understand this process, this article provides a model to simulate the transmission of such signals on medium voltage cables....
This article reviews various designs of electrical peak detect and hold circuits and tests their applicability for the detection of partial discharge pulses. Since partial discharges are very short pulses in the nanosecond range, the peak detector circuit must be very fast and thus work precisely over a wide bandwidth up to the GHz range. The artic...
Intelligent asset management requires condition-based maintenance. To monitor the condition of power cables online, partial discharge (PD) measurements are the most common method. For such measurements, high-frequency current transformers (HFCT) are usually used as sensors. However, a major problem when using HFCTs to measure PDs online is magnetic...
When using high-frequency current transformers (HFCT) to measure partial discharges (PD) on power cables, saturation of the sensor’s ferromagnetic core is a known problem. Saturation is usually not caused by the PD signals, but by the 50 Hz (or 60 Hz) operating current of the power cable. Saturation falsifies the measurement results, reduces the HF...
High-frequency current transformers (HFCT) are used to measure partial discharges (PD) or other transient current pulses on power cables. In addition to the PD signal, the power cable usually transmits a high current at a frequency of 50 Hz (or 60 Hz). Both signals are superimposed and inductively coupled by the HFCT sensor. In most cases, the magn...
The control of the valve timing is an important topic to increase the efficiency and to optimize the emission of the combustion engine. For small engines it is difficult to equip each valve with a separate actuator because it increases the system complexity. Changing the valve times in a limited range is possible with only one actuator. This actuat...
