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The world of diagnostics has to keep up with the needs and possibilities today's world requires and offers. Everybody want the desired information in a cheap way and with minimum delay. The world of diagnostics is no different. Online diagnostic tools can cover these demands. Proper usage of tools like CBM (Condition Based Maintenance) can save us lots of money otherwise spend on unnecessary maintenance...
The aging of electrical insulation material is one of the main topics for designers of electrical appliances. Much effort has been devoted to prepare statistical or physical methods of life time estimation in real operation of electric machinery. One of the problems in the estimation of insulation operational life is the existence of threshold values at which the change of aging mechanisms occurs...
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...
The world of diagnostics has to keep up with the needs and possibilities today's world requires and offers. Everyone want to have the information they desire at the moment and, of course, at minimal cost. The world of diagnostics is no different. One tool that offers that is the online diagnostics. It has many benefits that allow, with proper usage of tools like CBM (condition based maintenance),...
Natural esters are candidate element of transformer insulation system. Recently most common insulation in power transformers is composed of mineral oil and transformer paper. As there are efforts to preserve sustainable development, crude oil products should be eliminated and replaced by natural products, which are easily biodegradable. In past, it was shown, that natural esters may reach qualities...
Electric-power machines such as generators, large rotary machines, and transformers play an important role in electrical energy delivery. Since the beginning of electrical-energy distribution to consumers, offline diagnostics of these important machines has been performed. In time-based maintenance that is based on offline diagnostics, diagnosis is carried out at regular intervals, followed by maintenance...
Each electrical insulating material or system in large electric machines is precisely designed and later monitored in operation. The task for monitoring the state of the machine is information about rest life time of such as machine. The key element of electrical machine is its electroinsulating system. For proper rest life time calculation of an insulation system it is necessary to have complete...
Presented experiment consists of laboratory testing of partial discharges activity in liquid insulating fluids. Corona discharges within different insulation fluids were measured accordingly. The trends of partial discharge main parameters are studied and described in dependence on liquid type and aging time. The studied oils were thermally aged at 90°C for 3000 hours in air atmosphere within special...
Partial discharge measurement and subsequent analyses is one of important and capable test of electro-technological diagnostics. This test evaluates the properties of electrical insulation system of electrical machines and devices. There are a lot of partial discharge test methods based on physical or chemical detection of partial discharge. Described experiment consists of laboratory testing of partial...
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