VORŠIČ, Ž., PIHLER, J., MARUŠA, R.
HEATING OF CONDUCTORS IN STEADY STATE II
KOMUNALNA ENERGETIKA / POWER ENGINERING, 26
Factors such as voltage drop, power losses, stability, protection etc are important when selecting conductors cross-section in distribution and transmission networks. Important factor is also the rise of the temperature over the surrounding temperature: it is necessary to know the maximum continuous conductor current since it determines the maximum permissible temperature of conductor. The temperature of the conductor affects the conductor sag between the columns and determines the change in tensile strength due to warming. For short connection lines conductor temperature in emergency conditions is relevant for selection of the conductors cross-section.
DEŽELAK, K., JAKL, F., MARUŠA, R., PIHLER, J., ŠTUMBERGER, G.
IMPACT OF NON-ELASTIC EXTENSION OF CONDUCTORS ON THE OVERHEAD POWER LINE CONDUCTOR SAGS
KOMUNALNA ENERGETIKA / POWER ENGINERING, 14
Proposed paper deals with the problems regarding a non-elastic elongation of overhead conductors known as creep phenomena on account of mechanical yielding of material. Impact of non-elastic elongations of conductors is directly connected with the conductor sags and with smaller clearances between conductors and ground. Some results related to the researches in permanent elongations of conductors of the ACSR 490/65 type are presented, where compesation methods are applied as well.
MARUŠA, R., VORŠIČ, J., PIHLER, J., KOBAL, I., MARUŠA, L.
SELECTION OF A SUITABLE CONDUCTOR FOR GROUNDING THE CABLE SHIELD TO THE TRANSMISSION LINE TOWER
KOMUNALNA ENERGETIKA / POWER ENGINERING, 16
This paper describes which factors to consider when faced with choosing conductor for grounding of surge arresters and high-voltage cables on powerline construction, where transition between powerline construction and powerline cable takes place. For proper grounding of surge arrester and shielded cable, the grounding cables have to be designed to ensure efficient high frequency current flow to the ground that can reach up to 10 kA. During our research and measurements we have chosen such a conductor that at the same time ensures recommended parameters and is not of any particular value to vandalism.
MARUŠA, R., BEZJAK, S., BOBIČ, T., MARUŠA, L., BUČAR, A., BELAK, L.
PRACTICAL PREPARATION OF ELECTRICAL INSTALLATION REMOTELY CONTROLLED CONSUMPTION OF ENERGY
KOMUNALNA ENERGETIKA / POWER ENGINERING, 22
Smart Grid and. smart grids are theoretically in full swing, but the practical electrical installations in the users do not adequately adapted to the technology of remote control. In this paper we moved directions and applications designed to be remotely controlled certain electricity consumers even at installations in the domestic take-up of electricity.
BELAK, L., MARUŠA, R., FERLIČ, R., RIBIČ, J., PIHLER, J.
ANALYSIS OF THE SLEET CONSEQUENCES IN 2014 IN THE ELES TRANSMISSION SYSTEM
KOMUNALNA ENERGETIKA / POWER ENGINERING, 15
Republic of Slovenia and part of the neighboring countries in the end of January and beginning of February cover weather storm snow, sleet and rain. LED is a natural weather phenomenon that occurs periodically in different parts of Slovenia, particularly in mountain bulkheads where they encounter different climates. LED 2014 hit large parts of Slovenia and the large amount of ice, which cling variety of items including paralyzed. Most damage is caused to forests, power, rail and road infrastructure. During this period, around 10% of Slovenia's population were been without electricity. In this article we summarize the weather situation, past experience and damage to the transmission network. At the end of the article we show an analysis of the transmission network for the period before and after the ice 2014.
MARUŠA, R., VORŠIČ, J., PIHLER, J., FERLIČ, R., BELAK, L., RIBIČ, J., MARUŠA, L.
TESTING SLIDING GROUNDING CLAMP FOR EARTHING CONDUCTORS TO DOUBLE-CIRCUIT 110 KV TRANSMISSION LINE
KOMUNALNA ENERGETIKA / POWER ENGINERING, 20
This paper presents the testing Sliding clamps for grounding conductor transmission line. For the purpose of an effective transmission line grounding in working with vicinity of high voltage a special form of sliding clamps for grounding has been designed. Grounding device is intended for grounding transmission line conductors, which are dragged along conductor installation on a double-circuit transmission line, the second system operates normally which represents a significant risk for single-phase ground fault . The device must provide such a connection during the sliding along the guide, so that it prevents the arc and effectively discharges ground current into the ground.
Prior to regular usage, it was necessary for grounding the device to perform a series of tests, which are described in this article. A test with the realization of single-phase ground fault was also carried out on the transmission network of 110 kV ELES. All tests have been successful and positive.
MARUŠA, R., VORŠIČ, J., PIHLER, J., FERLIČ, R., BEČAN, M., ZAGORIČNIK, A., ULAGA, M.
CORONA AND RADIO-INTERFERENC PHENOMENON REDUCTION ON 220 KV BUSBAR IN PODLOG SUBSTATION
KOMUNALNA ENERGETIKA / POWER ENGINERING, 9
The restoration and the occurrence of corona and radiointerference on the primary high-voltage equipment busbar 220 kV in substation 400/220/110 kV Podlog is presented in this paper. On the busbars 220 kV substation in Podlog was due to wear fully replaced jointing and insulation equipment, including elements of design electric field. After performing assembly work, measurements were taken corona and radiointerference. The results are showed poor results, it was necessary to approach the restoration status. To perform to the repair, were made laboratory measurements of partial discharges and radiointerference. On the basis of tests and comparative measurements have been developed and tested prototypes corona rings. Based on the measurement results, it was concluded that the remediation carried out by corona rings, which have been designed and a prototype was confirmed by measuring the conformity of the appropriate form of the electric field to be replaced suspension and insulation equipment busbar 220 kV substation Podlog.
BELAK, L., MARUŠA, R., PIHLER, J., ZAGORIČNIK, A.
RECONSTRUCTION OF 220 KV BUS IN THE SUBSTATION 400/220/110 KV PODLOG
KOMUNALNA ENERGETIKA / POWER ENGINERING, 21
This Article describes the reconstruction of 220 kV bus (isolation and the corresponding material) in the substation 400/220/110 kV Podlog. The switching substation 220 kV has been in operation since the early seventies. Due to the long year operation and to the worn out equipment, the operations are no longer reliable. Because of this, the bus reconstruction was made in 2011. At that time, there was a primary objective that during the reconstruction the electro energetic system would be as less disturbed as possible. For this purpose, has been analyzed the operation of the 400 and 220 kV network during the reconstruction. The focus was on the implementation of the reconstruction to ensure the least disturbed electro energetic system and consequently the uninterrupted supply of electricity to consumers.
MARUŠA, R., VORŠIČ, J., PIHLER, J., ZUPAN, B., GRADNIK, T., BELAK, L., FERLIČ, R.
DETECTION OF COMBUSTIBLE GASES IN THE POWER TRANSFORMER
KOMUNALNA ENERGETIKA / POWER ENGINERING, 22
The paper presents an upgrade of existing gas (Buchholz) relay with a gas detection device, which is used for fault detection and protection of power transformers. The upgrade refers to a sensor for detection of combustible gases in (Buchholz) relay, which are formed during thermal and electrical defects in active parts of power transformer. In the first part paper focuses on describing mechanisms of production of combustible gases in oil, as well as intrusion of air bubbles into transformer tank due to leaking dilatation system. The second part provides description of the simulation setup for testing performance of the gas detection device in real-life conditions. The final section describes the sensor and automation of the transfer and processing of measurement data. It also presents useful practical advantages and opportunities that the upgrade brings for various transformer sizes as well as provides an estimate of installation costs and benefits through analysis of operational reliability increase of the upgraded transformer.