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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.
DEŽELAK, K., JAKL, F., BELIČ, E., ŠTUMBERGER, G.
EMISSIONS OF ELECTRIC AND MAGNETIC FIELDS CAUSED BY 400 KV OVERHEAD POWER LINES TYPE DONAVA
KOMUNALNA ENERGETIKA / POWER ENGINERING, 8
In proposed paper the emissions of electric and magnetic fields caused by 400 kV overhead power lines type Donava are dealt. Firstly, the classical Donava type overhead power line is dealt, while different varity of conductor bundle are considered. Secondly, the Austrian type of overhead line is considered, firstly without and after with additional 110 kV system on the same tower.
BELAK, L., JAKL, F.
INTRODUCTION OF CRITERIA FOR THE ASSESSMENT OF OVERHEAD LINES IN THE APPLICATION »CALPOS MAIN«
KOMUNALNA ENERGETIKA / POWER ENGINERING, 7
Calpos Main is a software tool for the realization of the RCM methodology (Reliability centered maintenance), that is a reliability centered maintenance. The maintenance of high-voltage equipment according to this methodology does not only monitor the status of the device, but also the power flow through a high-voltage network element. The higher the energy flow through the element and the lesser the network redundancy in a certain point, the more important is the element for the system. Therefore a reliability analysis is performed, which arranges all devices in I accordance with their importance for the system. To each device the RCM methodology thus allocates its value of importance as well as its value of technical condition. For the determination of the condition of a device the application Calpos Main is using a series of criteria, which have to be estimated. Each criterion has a certain weight. When all parameters of criteria are entered, the complete technical state of a device is reflected in a single assesment which is the so called index »c« (condition). The data is obtained from multiple sources: Maximo, diagnostics, CVZ (maintenance centers). Calpos Main now considers four types of devices: circuit breakers, disconnectors, measuring and power transformers. This paper provides a new introduction of criteria for evaluating the technical condition of "C" overhead lines owned by ELES.
DEŽELAK, K., DEŽELAK, D., ŠTUMBERGER, G., JAKL, F.
CALCULATION OF THE TEMPERATURE OF THE OVERHEAD POWER LINE CONDUCTOR
KOMUNALNA ENERGETIKA / POWER ENGINERING, 16
Temperature of the overhead power line conductor during operation represents one of the basic limit parameter for overhead power line operating. The allowed conductor heating must be under the limit values, because of high impact to the mechanical parameters of the conductors and conductor sagging. In the paper, all of the results are obtained with the CIGRE method, while obtained results are shown in program package Matlab.
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