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close this bookGeneration, Distribution, Use of Electric Current - Basic vocational knowledge (Institut für Berufliche Entwicklung, 141 p.)
View the document(introduction...)
View the documentPreface
View the document1. Introduction
View the document2. General remarks on the demand for electric energy and on the natural resources available
Open this folder and view contents3. Ways of generation of electric energy
Open this folder and view contents4. Power transmission and distribution in power supply systems
Open this folder and view contents5. Lighting installations and power installations
View the document6. The use of electric current by the various groups of consumers (assignment)
Open this folder and view contents7. Measuring technology of checking electrotechnical installations and equipment and of permanently controlling the main parameters in operation (I, U, P, Wh, Q, )
Open this folder and view contents8. Protective, control and supervisory systems as important additional equipment for power installations

1. Introduction

Electric current is generated, distributed and used in a closed system, normally called electrical installation (or plant). Physical effects make it necessary to subdivide the electrical installation into two subsystems:

Power unit (or electric energy equipment)

It is exclusively used for the generation, transformation, storage, transmission, distribution and use of electric energy and comprises an energy unit with the equipment to serve the afore-mentioned purpose and an information unit to guarantee the control and protection of the installation.

Secondary unit (or information equipment)

It is used for the generation, acquisition, transmission, processing and output of information (control and protection of the electrical installation) and comprises an energy unit to supply the necessary energy and an information unit with the respective equipment to serve the afore-mentioned purpose of the installation.