Measuring of voltages and ELF electric fields of high-voltage network in Bosnia and Herzegovina

In the paper the results of measurements of voltages and electric fields of extra low frequency (ELF) below 400 kV transmission lines in Bosnia and Herzegovina (B&H) are presented. In the high-voltage network in B&H there were registered a significant number of power frequency overvoltages in the regime of small loads after its reconnection in common energy system UCTE (Union for the Coordination of Transmission System Operators for Electricity), and today ENTSO-E (European Network of Transmission System Operators for Electricity) in October 2004. Increased voltages in the high-voltage network causes increase in the value of electric field and exposure of human bean to electric fields. On the other hand, high voltages in the network causes higher power losses due to AC corona. Therefore, it is important to determine the value of electric field in the vicinity of high-voltage lines to assess their effects on people and equipment as well as value of electric field at increased voltages to accurate determined power losses due to AC corona. The results of measurements of electric fields in the spatial profiles at 1, 2 and 3 meters above ground at distances up to 20 meters from line are presented.