Original scientific paper
First Experience in Monitoring of Line Surge Arresters Installed on 110 kV Transmission Line Ston – Komolac in Croatia
S. Bojić
; Energy Institute Inc., Zagreb, Croatia
I. Dolić
; Energy Institute Inc., Zagreb, Croatia
A. Sekso
; Fortia Ltd., Šibenik, Croatia
J. Radovanović
; HEP-Transmission System Operator Ltd., “Elektroprijenos Split”, Zagreb, Croatia
D. Škarica
; HEP-Transmission System Operator Ltd., “Elektroprijenos Split”, Zagreb, Croatia
Abstract
In paper are presented some first results and experience in real time monitoring of line surge
arresters installed on 110 kV transmission line Ston – Komolac in southern part of Croatia. Mentioned
line is the first line in Croatian transmission network equipped with line surge arresters (LSA).
The line with its length of 43,95 km is situated in region with high soil resistance, exposed to
one of the highest level of lightning activity in Croatia. At the same time it is the most important line
in connecting HPP Dubrovnik (240 MVA) to the main part of 110 kV transmission network.
Due to all mentioned reasons and great number of annual outages, it was decided to equip the
line with LSA for improving the lightning performance and the availability of line. As result of
performed numerical simulations on simulation line model it was decided to install 110 kV gapless,
IEC Class II line arresters. Also, to improve analysis of expected results the 61 line arresters were
equipped with Excount-II type of monitoring sensors. The main goal was to determine the behaviour
of line arresters arrangement across the line during overvoltage events on towers. This installed “realtime”
monitoring system enables remote control and wireless exchange the collected data from local
data logger installed on LSA. Line arresters activity is monitoring through numbers, date and time and
level of surges and the condition state of LSA, through the measuring of leakage current.
First results in application of LSA are showing significant reduction of line outages with
registered relatively strong activity of monitored line arresters. Also, as it was expected some
particular part of line is espied to be exposed to higher frequency and higher level of registered
arresters surge current. During collecting the data of LSA activity, some practical problems were
encountered with time synchronization between monitoring devices and it is mentioned and discussed
in paper, too.
Although the analysed time period of eight months with LSA application is too short to allow
strong final conclusions, obtained first experience will be very helpful in assessment of further LSA
application in Croatian transmission network.
Keywords
Line surge arrester; Line outages; Monitoring; Line surge arrester monitoring; Arrester activity; Arrester surge current; Collected data base
Hrčak ID:
198513
URI
Publication date:
20.6.2017.
Visits: 835 *