KASIAN - computing and analyzing electricity networks A Brief Description of the Functions and Characteristics of KASIAN KASIAN is used to create and update databases of electrical networks represented in graphical form and to analyse and assess these networks for optimal build-up, development and operation from technical, economic and safety points of view. Its main functions and features are: • KASIAN program includes a powerful and user friendly graphically oriented system for the acquisition and update of database of electrical networks of all types and voltage levels, and for the following graphical outputs (CRT monitors, printers, plotters, standard files of raster and vector graphics) of set schematic diagrams including computed values and signalling of various states and characteristics of elements; during the setup of networks it is possible to use tablets and digitizers; networks can be set as a unipolar schematic diagram, as a geographical map or as a combination of both. • The set network can be hierarchically divided into two (in future any number of) "levels", of which each can be of a different type and each can be set in its own coordinate system, independent on the others. Maximal operational transparency is always maintained (projection and other activities can be done simultaneously in the main schematic diagram and in the windows of all selected details, e.g. transforming stations and substations - switchboards). Schematic diagrams of switchboards can be set without any limitations and in any connection. • Lines can be set in the KASIAN program as multiplied with any number of tappings (which are the points in the line to which other elements of the network are connected) and they are created automatically during the setting of these different elements. The ends of separate conductors of multiplied lines can be connected to other elements according to the need. • Data in the program KASIAN can be stored in the files of either proprietary binary structure or in database of any standard. • To enable the communication with any systems (GIS, SCADA e.t.c.) there is a standard database interface (ORACLE or any other database standard) of the set composition of tables and their structures and the KASIAN program can import and export data to/from the network and also the results of the computation of the network behaviour; it is also possible to enable a direct access to the data without the interface if the user wishes so. This accelerates both the data transmission and the analysis of the networks stored in the database. • KASIAN program makes detailed analysis of the connection of network elements down to separate sides of the switching elements to the individual supplying points (supplying transformers and balance nodes). The program enables to make switching manipulations and to model various operational states of the network; consequently it is possible to evaluate non-deliveries of the electrical power and to create lists and tables of consumption and consumers with power outages and their following assortment and judging according to the chosen criteria. • To determine active and reactive consumption from the instaled capacity of electrical appliances and known (measured) loads in supplying elements (transformers or outlet lines). • The computation of load flow of electrical networks, i.e. the calculation of basic electrical parameters (voltage, output and current loads, active and reactive losses in the power lines, transformers and other elements of the network); it is possible to select various operational profiles according to the supplying, regulating, switching and loading conditions; the computation is done by alternating complex method as a non-linear task; during the computation it is possible to take into account regulation of the voltage by the change of the reactive output according to the exciting of the generators. • Short-circuit currents and power calculation according to CSN 33 3020 and CSN 33 3022 (IEC 909) for symmetrical and asymmetrical short circuits, nearby and distant; at the set position of the short circuit voltages and currents in all phases are computed for all points and all elements of the network with all kinds of short circuits including impedance measured by distant protection located in the appropriate point of the network. There can be also computed the current 3*Io, the current course from the moment of the short circuit origin to the moment of its switching off, accurate values of the surge current (mechanical axcerting) and equivalent heating current. In the computation of the short-circuit there can be taken into account the set resistance of arc and the moment of the origin of the short-circuit. The program enables to evaluate all the above stated values at switching elements with all common connections of the switching stations. • The computation of relations at ground fault in the systems with isolated or indirectly grounded neutral point of transformer or generator (via a resistor or an inductor of set values or a parallel combination of both). • The check-up of the designed protection in the TN networks of any configuration with regard to the disconnection times according to CSN 33 2000-4-41 - Protection against electric shock PNE 33 0000-1. Protection against electric shock in the distribution network of an electrical power supplier. • It is possible to make use of the relation of the existing database of electrical power consumers (e.g. consumers information system) for the computation of the network's load. This can be also done using an external function (in the form of DLL). • It is possible to display and view the files of the DGN type of the MicroStation system including viewing of the data from connected database. (Any product of BentleyŇ is not necessary and this possibility can be expanded to enable making changes in both numeric and graphic data.) The program can be also used as a viewer or during digitalisation of the network by its setting to the underset planimetric map. • If DGN data from the previous paragraph represents electrical power network, it is possible to transform it more or less automatically to the structure of the network data of the KASIAN program and after appropriate adding of other necessary data to make computations stated above (import of data from GIS using DGN drawings). GEOVAP, spol. s r.o. Cechovo nabrezi 1790, 530 03 Pardubice, Czech Republic tel.: +420 466 024 111, fax: +420 466 657 314, e-mail: info@geovap.cz