Abstract
The direct contact of a tree or a branch of tree with Covered Conductors (CC) overhead lines causes Partial Discharges (PD) inside the insulation. The presence of PD degrades the insulation systems and eventually destroys insulation, which may lead to power delivery interruption. The detection and diagnosis of PD is an important tool to address the problem of tree caused faults in forested terrains. The PD occurs in the impulse component of the signal, which is usually measured by Rogowski coil (current signal) or single layer inductors (voltage signal). In this paper, we introduce a possibility to detect the tree caused faults with the usage of whip antenna. The advantage of the antenna is a very low price and the possibility to install antenna under voltage. The disadvantages are sensitivity to ferromagnetic materials and impossibility to distinguish affected phase. The measurements were carried out in the real environment in forested terrain in Jeseniky Mountains. The real environment is different from a laboratory conditions due to heavy noise (e.g. corona, radio emissions). This paper provides an examination of the background noise from the antenna signal. The experimental results indicate that the antenna may be successfully used instead of the current approach.
Highlights
Usage of CC on overhead powerlines brings some advantages compared to usage of regular Aluminum Core Steel Reinforced (ACSR) conductors [1] and [2]
Our goal is to develop a simple tool for detection of Partial Discharges (PD) activity on Medium Voltage (MV) overhead lines
All measurements were performed in real environment of forested terrain in Jeseniky Mountains
Summary
Usage of CC on overhead powerlines brings some advantages compared to usage of regular Aluminum Core Steel Reinforced (ACSR) conductors [1] and [2]. During the contact with CC internal PD appear inside its insulation These discharges cause degradation of an insulation, so a long term contact between CC and branch is still able to cause a short circuit fault [2]. Technicians will be able to recognize a fall of tree or branch on the line and remove it before avoiding a serious powerline fault. PD activity creates characteristic pattern in an impulse part of time domain of a signal. Current or voltage signal is examined for presence of PD pattern [6]. This can be done using common signal processing tools, machine learning algorithms etc
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