The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Electrical insulation system is one of the most important part of the electrical equipment. However, also the weakest link in the chain of the reliability of the whole device. The main aim of this paper is to describe different kinds of defects of electrical insulation and their impact on the field distribution and on other parameters. It may lead to local overloading of insulation and to shortening...
Composite insulation systems are an inseparable part of high voltage equipment. The strongly inhomogeneous structure of these materials is the main problem which may lead to defect during its operation. The main aim of this paper is to describe new composite insulation material with the polymer matrix, magnesium oxid filler and polyethylene naphthalate carrier. Dielectric properties like dissipation...
Because of the financial savings and with respect for the environment, several efforts are made to replace AC voltage long distance transmission lines for DC voltage transmission lines. This may lead to increases of charging of insulation materials. The main aim of this paper is to describe the space charge accumulation in insulation material and its effect on local overloading of insulation material...
Composite insulation systems are inseparable part of most electrical installations. Strongly inhomogeneous structure of these systems is the main problem which may lead to defect during operation life. Main aim of this paper is to introduce novel composite material designed for insulating system of high voltage equipment. This material is composed of epoxy resin matrix with dispersed magnesium oxide...
Ternary insulation systems are used for several decades in high voltage engineering. The main problem is their inhomogeneous structure which may cause defects during operation and this can limit the life of the entire device. Currently, there are efforts to develop material that is macroscopically homogeneous. Homogenization of material results in a reduction of differences of local electric field...
The most commonly used insulating liquid is mineral oil. Mineral oil is characterized by high flammability and poor biodegradability. On the other hand, this oil has very good electrical properties. For reasons of environmental protection is an effort to replace the mineral oil by alternative insulating liquids. The vegetable or synthetic oils may be used as an alternative insulating liquid. The rapeseed...
This paper deals with experimental results of the combined electrical and thermal aging of two epoxy resins with nanosilica subjected to AC voltages. Overall 20 samples were prepared. Ten samples contain laboratory epoxy resin DGEBA, hardener Laromin C260, and nanosilica. Other 10 samples contain industrially used epoxy resin Epoxylite also with nanosilica. These ensembles had been measured prior...
This paper deals with diagnostic of composite insulation material which are currently used in high voltage appliances e.g. in large rotating machines — turbo or hydro generators. This composite is consist of calcinated mica paper, polyethylene terephthalate (PET) foil and epoxy-novolac resin. The insulation composite material with inhomogeneous structure was subjected to accelerated thermal aging...
This paper present a study of casting compounds used in the electrical industry, especially in manufacturing and repairs of electric rotary machines. The basic types of casting resins and their basic application in the electrical industry are described. This paper focuses on electrical and mechanical properties of selected casting resins. The chosen diagnostic system should give an objective point...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.