Electrical Engineering Articles
 

Electrical Engineering Articles
http://www.zone4info.com/public/arta...d1.jpeg?c=a95c Instrument Transformers

Instrument Transformers A. Two Types1) Potential (Usually 120v secondary) 2) Current (5 amps secondary at rated primary current) B. Accuracy3 factors will influence accuracy: 1) Design and construction of transducer 2) Circuit conditions (V, I and f) 3) Burden (in gen...

http://www.zone4info.com/public/arta...ba.jpeg?c=b1d5 Loads on Transmission Line Structure

Loads on Transmission Line Structure Loads are calculated on the structures in three directions: vertical, transverse, and longitudinal. The transverse load is perpendicular to the line and the longitudinal loads act parallel to the line Vertical Loads Th...




http://www.zone4info.com/public/arta...4a.jpeg?c=65f1 Overvoltage protection (surge arrester)

Surge ArrestorsA ground system with radials and a perimeter ground that is well-made, and cables that are routed in a way that minimizes tower take-off voltages and coupling, can direct about 90% of the lightning's energy directly to ground. That percentage is somewhat of an up...







http://www.zone4info.com/public/arta...dd.jpeg?c=c575 Disconnectors, load-break switches and switch disc...

Disconnectors, load-break switches and switch disconnectorsThe requirements for mechanical switching devices for switching of load currents and safe isolation of systems or subsystems from the supply network are the subject of standard IEC 60947-3 (VDE 0660 Part 107). ...




http://www.zone4info.com/public/arta...10a.jpg?c=81ab Medium Voltage Network Structures

MV network structures We shall **w look at the main MV network structures used to feed secondary switchboards and MV/LV transformers. The complexity of the structures differs, depending on the level of power supply security required. The following MV network supply arr...