Notes on PSI is a write up that covers some of the basic points on Traction Substation and Traction Switching Stations. To view the same in PDF format click the link below :
Posted by Anup Mohan on Friday, August 30, 2013,
In :
Design
Cable sizing is the process of selecting the appropriate sizes for electrical power cable so that the chosen cable works efficiently. Cable sizes are typically described in terms of cross sectional area or in terms of Standard Wire Gauge (SWG) according to the geographic region. It is important to chose the apt size of cable for all applications so that it is ensured the cable satisfies the following requirements; a) The cable should be able to operate continuously under full load with out a... Continue reading ...
Posted by Anup Mohan on Tuesday, March 6, 2012,
In :
Design
Lightning is a natural hazard, being the discharge of static electricity. Some of them cause damage to buildings or equipment and a few even kill or injure people and animals directly or indirectly by causing fire and explosions. The important part of a lightning flash, from the resulting damage point of view is the "Return Stroke". This is the part in which the a charged cell in a cloud is discharged to earth.
Effects of Lightning Stroke: As the current is discharged through the resistance of... Continue reading ...
Posted by Anup Mohan on Thursday, November 17, 2011,
In :
Design
When you look into a substation layout, say for instance a 132kV Switchyard you would notice that all the equipment installed will be same as the nominal system voltage except for the lightning arrestor. A few days back I found that many of them still have this as unanswered question so as to why is the LA rating chosen lower than the system voltage. So I thought I could share my idea on this with everyone through this post.
When you consider a three phase system, the LA is placed between each... Continue reading ...
Posted by Anup Mohan on Friday, November 4, 2011,
In :
Design
The earthing system shall consist of a network of buried conductors forming the earth grid, providing the earthing connections to equipment ground terminals, equipment housings and structures. If the calculated Mesh and Step potentials for this earthing system is less than the attainable mesh and step potentials, then the design is considered to optimum one.
The earth grid shall encompass all of the area of the sub-station within the fencing and also shall extend for approximately one meter o... Continue reading ...
