2013-12-22 10:39
Please submit on or before 12:00 nn of January 6, 2013. Those submitted after the said date and time will be marked zero (0).
1. At what values of x does the graph of y = sec x have a… Read More
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Tags:
distribution
conductor
unbalance
usual service
synchronous generator
copper
surface
ampacity
assemblies
generator
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2013-11-09 02:56
If a short circuit is applied to the terminals of a synchronous generator, the short-circuit current starts out at a high value and decays to a steady-state value some time after the incepti… Read More
2013-11-08 03:48
Causes of phase-voltage unbalance
Most utilities use four-wire grounded-wye primary distribution systems so that single-phase distribution transformers can be connected phase-to-neutral to s… Read More
2013-11-02 04:46
Conductor current–carrying capacity, or ampacity, is determined by the maximum safe operating temperature of the insulation used on the conductor. Heat generated as a result of current… Read More
2013-10-12 13:36
What are copper clad aluminum conductors?
Copper-clad aluminum is the newest conductor material on the market. A copper-clad aluminum conductor is drawn from copper-clad aluminum rod, the c… Read More
2013-10-01 01:08
Production TestsUnless otherwise specified, all production tests shall be made by the manufacturer at the factory on the complete MEI switchgear or its component for the purpose of checking… Read More
2013-09-05 10:30
The service conditions below are significant to the qualification of switchgear assemblies and included components.
Usual Service ConditionsThe values given as usual service conditi… Read More
2013-07-27 07:11
Today's post is brought to us by our guest. He is Daryll Valdez, a student from the University of Mindanao, in the Philippines. Darryl is currently finishing his Bachelor's Degree in Electri… Read More
2013-07-04 06:12
In the unloading, handling, and storage of structures, care should be exercised so as not to damage the surface or surface coating, or deform the members. Bare wire rope or steel chains shou… Read More
2013-06-06 08:17
To apply busways properly in an electric power distribution system, some of the more important items to consider are the following.
Current-carrying capacityBusways should be rated on a temp… Read More
2013-06-06 03:22
When lightning strikes a transmission line the field intensity stressing the insulation may exceed the ionization field intensity level (roughly 30kV/cm) and create an arc from the line to g… Read More
2013-06-05 07:14
Series compensation of long high-voltage and extra-high-voltage lines has become almost standard practice. The presence of series compensation affects the X0/X1 ratios of the system, with th… Read More
2013-06-05 06:59
Bus connectionsWhen the MC switchgear consists of several shipping sections, the main bus is necessarily disconnected before shipping. The main bus should be reconnected, with particular att… Read More
2013-06-05 04:51
Overall ratings
The overall ratings of PMFSG shall include the following:a) Rated power frequency;b) Rated maximum voltage;c) Rated lightning-impulse withstand voltage;d) Rated power-frequen… Read More
2013-06-05 04:42
The following are recommendation based on IEEE STD 525-1992
Shielding practices
a) The cable for computer or high-speed data logging applications, using low-level analog signals, should be… Read More
2013-05-23 14:52
The two general types of construction used
for shunt reactors are dry-type and oil-immersed. The construction features of
each type, along with variations in design, are discussed under the… Read More
2013-05-23 14:49
Manual closing or autoreclosing without
synchronization supervision at line terminals that are in close electrical
proximity to turbine-generators can subject them to excessive shaft torques… Read More
2013-05-12 09:31
The ultimate surge voltage protection
is obtained through arrester voltage ratings as low as system
grounding conditions will permit during normal and abnormal system
conditions. Initially… Read More
2013-05-12 09:00
IEEE Std C37.48-1997 covers in detail
the application guidelines for high-voltage external capacitor fuses.
The energy stored in the healthy
capacitors of one series group of parallel-co… Read More
2013-05-12 08:50
The application of large shunt
capacitor banks with switched parallel banks in high-voltage
transmission systems involves a number of considerations, one of
which is grounding. It is general… Read More
2012-12-31 13:04
To all our visitors, most especially to our followers and supporters, the Management and Staff of transmission-line.net and the MOSTECH Group would like to extend our greetings.
Thank you f… Read More
2012-12-17 12:17
The selection of the ac supply system
voltage typically begins at the service entrance of the facility. In
most commercial environments in the U. S., the utility supplies
three-phase power a… Read More
2012-12-15 13:47
Foundations
The foundations for poles are just as
important as the structure above ground. The pole backfill should be
capable of withstanding structure reactions. Pole-setting equipment
sh… Read More
2012-12-11 13:45
One of the principal influences on
protective relay settings is load; hence, maximum load current level,
in turn, may influence fault detection sensitivity.
Phase overcurrent relays
Pha… Read More
2012-12-08 15:33
Cable shields and metallic sheath/armor
should be solidly grounded at one or more points so that they operate at or
near ground voltage at all times. For additional information see IEEE Std… Read More
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