Abstrak

This paper presents the effect of natural aging upon the performance of the poly meric insulat ion materials made fro m Epo xy resins, Polydimethylsilo xane (PDMS), and Rice husk ash compound. The sa mples of epo xy resin insulation material consist of Dig lycidyl Ether of Bisphenol A (DGEBA ), Meta Phenylene Diamine (MPDA) as curing agent, and 325 mesh Rice Husk Ash (RHA) as filler, treated with variat ion of PDMS content. The research aims are to observe the Equivalent Salt Deposit Density (ESDD), crit ical leakage current, and flashover voltage on the insulation material surface that has undergone a natural aging. Experimental method was carried out through the following procedure. The samples were placed outdoor for natural aging test, outside the building of electrical engineering and informat ion technology of Gadjah Mada University in Indonesia. Then the ESDD, crit ical leakage current, flashover voltage on the sample surface was measured every 2 weeks. The experiment results show that the performance of insulator material fluctuates during 52 weeks. The higher PDMS with RHA filler content the lower ESDD and surface leakage current. Furthermore the flashover voltage increases.

The hydrophobicity on surface of insulator material in outdoor is very important. In humid and the rainy conditions, the insulator surface must not easily wet, so that the surface conductivity of insulators remain low, thus the surface leakage current is very small. Therefore the polymeric insulator must be hydrophobic and withstand against environmental conditions. This paper presents the effect of polysiloxane content upon contact angle and the hydrophobicity of high voltage insulator made of epoxy resins, polydimethyle siloxane (PDMS) and rice husk ash compound in artificial environment. The samples of epoxy resin insulating materials were based on Diglycidyl Ether of Bisphenol A (DGEBA), Metaphenylene-Diamine (MPDA) as curing agent and 325-mesh Rice Husk Ash (RHA) as filler, treated with variation of PDMS content. This research aims to improve the hydrophobicity of polymeric insulation materials.Experimental method was carried out through the following procedure. The samples were installed in the special chamber, then were exposed to pollutant at their surfaces.They were radiated using ultraviolet in artificial environment. Contact angle of water droplets on the sample surface was measured. The experiment results showed that the PDMS treatment of filler can improve the hydrphobicity of insulator material, compared without PDMS.

No abstract

The main issue of transmission services in the deregulated electricity supply is how to compensate on harmonic losses associate with the transmission cost. The Harmonic factor is one component of losses caused by electronic devices on the customer in the network. In power system, the deregulation of electricity market is transparent and fair, then all user can transmission charge in accordance with the utilization and power quality. This paper proposes a new scheme and uses the method as a pro-rata modification. The proposal uses some of the harmonic models at each load condition to determine the transmission loss. Based on testing using the 5 bus simple, it can be seen the transmission loss based on the comparison harmonic content of the customer.