Acoustic detection of noise emission from discharge activity in power engineering

This article deals with results from analysis of acoustic signal obtained from experiments realized in nonhomogeneous electric field. These signals exist in the form unwanted noise which can be used also for diagnostic purpose. In power engineering this case occure in high voltage power station and transmission lines. We analyse acoustic signal from acoustic sensor in audible band from 1 kHz to 20 kHz. The acoustic signal transmitted from object is unique for specific conditions. Exploitation of audible band for discharge detection is difficult in outdoor bias level. Advantage of this method consist in simple results prepare

Discharge activity detection in acoustic band in strong electric field

This paper is oriented in the area of analysis of acoustic noise obtained from service of power engineering devices with very strong electromagnetic field. In this case not only operator but also measurement devices need protection. For this purpose optical insulated amplifier with frequency range up to 2 MHz was developed. We analyse acoustic signal from acoustic sensor in audible band from 1 kHz to 20 kHz. The acoustic signal transmitted from object is unique for specific conditions. Exploitation of audible band for PD phenomenon detection is difficult in outdoor bias level but with appropriate filtering it is possibile this disadvantage eliminate. Advantage of this method consist in simple results prepare

The influence of soil parameters on the price of agricultural land in Slovakia

ABSTRACTThe article analyses the relation of market prices in the agricultural land market and selected pedological characteristics of traded lands. During the period of 2009–2018 in 12 districts of Slovakia more than 153,000 plots with different pedo-ecological and geographic conditions have been analysed. Based on soil types, texture composition, steepness, gravel content, and depth, corresponding price levels were derived, and soil price maps were developed. The highest valued soils are of chernozem type (EUR 1.64 m−2), loamy soils (EUR 0.86 m−2), soils on flat land (EUR 1.09 m−2), slightly gravelly soils (EUR 1.02 m−2), and deep soils (EUR 1.10 m−2). The land price is evidently highly correlated with its qualitative parameters. Using GIS technologies, the entire territory of Slovakia has been categorized by this means and a so-called basic map of agricultural soil market prices in Slovakia has been created