Revati C Rathi, V. G. Raut
This project describes how to provide standardized, current based, numerical protection for any threephase power transformer, including phase-shifting transformers with variable phase angle shift and transformers of all construction types and internal on-load tap-changer configurations. First we review the concept of numerical protection. Numerical protection is a unit-type protection for a specified zone or piece of equipment. It is based on the fact that it is only in the case of faults internal to the zone that the differential current (difference between input and output currents) will be high. Graphical User Interface is a type of user interface that allows users to interact with electronic devices through graphical icons and visual indicators such as secondary notation as opposed to text based interfaces, typed command labels or text navigation. The actions in GUIs are usually performed through direct manipulation of the graphical elements. GUIs stand in sharp contrast to command line interfaces (CLIs), which use only text and are accessed solely by a keyboard. A GUI may be designed for the requirements of a vertical market as application-specific graphical user interface. Two of the most popular operating systems, Windows and the Mac OS, are GUI-based. Commands are issued in the GUI by using a mouse, trackball or touchpad to first move a pointer on the screen to, or on top of, the icon, menu item or window of interest in order to select the object. Then for example, icons and windows can be moved by dragging (moving the mouse with the held down) and objects or programs can be opened by clicking on their icons.
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