The Electrical Design Center in Cebu
Since 2000
"The Power to Engineer is our Edge"
Now on its' 16 Years!
July 13, 2000 - July 13, 2016
Articles
POWERING INTERNET HOTELS & MODERN OFFICE BUILDINGS
August 2006 : Doods A. Amora (PEE)
A power distributor company in the USA had just finished the construction of a distribution system on a suburban site planned for 5.0 MW. When the infrastructure became ready for use, piles of application for power connection reached an aggregate demand of 45 MW – a staggering 10 times of what was envisioned! In order to accommodate these load applications, the distribution company needed to install additional transformers. But new transformers were not enough, and new feeders were needed. But the new feeders were not enough; they needed to upgrade their network. In the end, the power company put up three additional substations and is posing to build more for redundancy requirements. This is not an isolated case, as this is happening everywhere and every time today in the modern world. The reason? INTERNET HOTELS….
SIZING TRANSFORMERS WITH LARGE MOTOR LOADS
December 1, 2006 : Doods A. Amora (PEE)
The purpose of this article is to help expand the engineer’s basic understanding on ‘short circuit capacity’ – how it affects voltage sags during starts-up of motors of significant sizes.
But why are Short Circuit & Motor Starting Calculations involved in transformer sizing?
One clue is:
"Starting up one thousand-1.0 hp motors is world apart from starting up one-1,000 hp motor"
THE POWER PLANT OF AN INDUSTRIAL PLANT
July 26, 2007 : Doods A. Amora (PEE)
An industrial plant like a brewery, cement plant, sugar milling plant or a wood-based industrial complex may in some instances elect to put up a self-generating plant to support its power requirements. In the country, these power plants are either diesel or steam power plants. The steam power plants are commonly fuelled by coal, or a combination of bunker oil & wood wastes or a combination of oil & sugar cane refuse called bagasse.
There could be four reasons for the concept, i.e.:
1) there might be no existing power supplier in the vicinity where the industrial plant is to be erected..
RELIABILITY OF INDUSTRIAL PLANT POWER SYSTEM
September 2008 : Doods A. Amora (PEE)
This article is an assimilation of the interwoven factors & issues that contribute to the reliability of power systems in industrial plants. As Reliability is a broad scope, understanding what it is, comes first.
IEEE defines RELIABILITY as "the ability of a system or component to perform its required functions under stated conditions for a specified period of time." Likewise, from the Wikipedia, Reliability may be defined in several ways, as follows:
MYSTIQUES IN SYSTEM PROTECTION
March 2009 : Doods A. Amora (PEE)
One sunny morning in what could have been a promising smooth routine; the Diesel Power Plant of an Independent Power Producer (IPP) suddenly lost its 50 MW power flow to an Industrial Economic Zone. The audible thuds at the switchyard somehow announced that the circuit breakers at the primary and secondary sides of the twin - 40 MVA Power Transformers T1 and T2 tripped off simultaneously! From the looks of it, the Transformer Lock-Out Relays (86T’s) must have done it! But, why...?
It didn’t occur just once - it already happened a number of times. And it would certainly happen again.
UNDERSTANDING MAINTENANCE
June 2008 : Doods A. Amora (PEE)
In any facets in life, there is always what we call as “desired condition”. And Performance Standards have always been derived from these “desired conditions”...
Performance Standards of machines as goals in maintenance are often based on the workings of things when they are still brand new. In other words, it is often desired that performance of anything (capacity, process capability, efficiency, throughput, etc) must not degenerate in the entire lifetime of the machine. But reality is that there is always an end to any lifetime and that the likelihood of deterioration increases with age.
Above Photos courtesy of Internet