METHODICAL GUIDANCE TO COMPUTING AND SCHEMATIC PAPER

Discipline of "Electrical Engineering" is a that base on which further education is built of a number special disciplines of electrical engineering type.

As a result of discipline learning the future specialists must get clear knowledge about the electromagnetic phenomena and processes which take place in the various technical devices of electrical engineering equipment. The got knowledge must positively assist future engineers to exploit a technique rationally.

The Academic Discipline embraces the considerable volume of actual material and naturally needs persistent systematic independent work both at the study of theoretical expositions of its themes and divisions and at the solution of tasks of calculation and analysis of electric circuits - constituents of electrical engineering equipment.

The calculations of concrete electrical engineering’s tasks it is expedient to begin with the simplest, for example, after collection {9}. Examples of solution of some typical tasks are made in this edition

It is foreseen the curriculum of discipline implementation of Computing and Schematic Paper and two module tests, recommendation to implementation of which resulted separately.

COMPUTING AND SCHEMATIC PAPER

Task 1. A calculation of the ramified electric circuit with the sources of

direct-current

A purpose of task is deepening of knowledge of theory and acquisition of practical skills of solution of electrical engineering’s tasks.

Before the work processing it follows attentively to familiarize with maintenance, work out the given examples with the solutions of concrete tasks.

The explanatory message of Computing and Schematic Paper (CSP) it follows to execute on the standard folias of A4 format, and to build graphic charts and diagrams in a comfortable scale with the observance of corresponding standards.

Table of contents of task

For the given electric circuit of fig. 1 to execute the following:

- to draw initial, and also simplified charts (on the simplified chart
inductive and capacitive elements which do not influence on distribution of
currents in the branches of circuit are absent);

- to lay down the system of equations for the calculation of circuit
after the method of Kirchhoff s equations;

- to define unknown currents and voltages on the elements of circuit,
using the methods of contour currents and node potentials;

- to solve equation of powers balance and estimate exactness of
calculations;

- to define voltage at capacitor plates;

- to define the current of I_n by equivalent generator method;

- to build a potential diagram for a contour with two sources of EMF;
Variant of CSP task №1 is choused after two last numbers of test book

code and initial letter of the family name of student. The last number of code answers the number of circuit of fig. 1, next to last number - to the number of column of table l, and initial letter of the family name - to the number of column of table 2.

Table 1

A number of variant and data is to the calculations

Table 2

An index of variant and data is to the calculations

The calculation of electric circuit, as a rule, consists in determination of currents in branches, voltages across areas, and also powers of sources and users of electric power.

It is taken essentially to the solution of the system of linear algebraic equations.

At the solution of task of circuits calculation it follows to remember, that on charts ideal elements are given, id est such as an ideal source of voltage (source of electromotive force - EMF), internal resistance of which equals to zero, ideal source of current (SC), internal conductivity of which equals to zero, and passive elements: resistor, capacitive and inductive, each of which owns one parameter only. Thus it should be remembered that resistance of inductive element to the direct current in a steady mode zero, and capacity - infinite.

Fig. 1

Date: 2015-01-12; view: 1275