The Benefits Of Variable Speed Drives On Electrical Motors

As today's technology Many Electrical motor applications in industry do not require constant speed. Why because most motors used are induction motors, whose speeds are practically constant. So therefore the energy consumption would have been optimized, had the motor speed been varied to correspond to the load demand. This is where variable speed drives come in. Through the electronics, the motor frequency is adjusted to correspond to the load requirement. A drawback here is the production of harmonics. So what's the benefits of variable speed drives. Here it is Authored by one of the popular Engr. of The Philippines Engineer Arsenio Abellana.

1. Reduced energy consumption - Centrifugal fan and pump loads operated with variable speed drives reduce energy consumption.

2. Reduced power demand during start-up - With the smooth speed control provided by VSD's large inrush currents, and consequently large power inrush, are avoided. This result to a lower demand charge.

3. Lesser mechanical stress - And ac motor is started across the line, takes a s much as seven to eight times the motor full load current start the motor and load. When a variable speed drives is used, the substantially reduced starting current reduces the wear and tear on the motor, thus extending the life of an ac motor.

4. Reduced power line disturbances - When an ac motor is started across the line, the demand for staring current, drains the power distribution system connected to the motor, thus the supply voltage sags, which can cause sensitive equipment connected on the same distribution system to trip. Items such as computers, sensors, electronic switches and electrical contactors are voltage sensitive and cna drop out when a large motor is started.

5. Controlled stopping - With a VSD, finely controlled stopping can be easily done. This helps reduce product breakages or mechanical wear and tear to shocks to the manufacturing process.

the last is

6. Elimination of some parts in the process - With the use of a VSD, some parts in the process may be superfluous. For instance, we can eliminate the need for a reversing starter, since the output phases to the motor can be electronically changed without mechanical devices.

You can go to this site also about motor Guide..By ABB

How To Design And Estimate On Electrical Distribution And Transmission Lines

Electrical supply in our house is very much important but not compared to the water supply maybe its only a secondary but then without electricity in our house we may not be happy why because most of our appliance in our house need electricity and even lights almost everything because today's world are independent to electricity, the question how they come up?, what is the source ? and what is the origin behind that. And today I would share my expertise as an Distribution Engineer where I work routinely at present. My day to day activities is to make design and estimate from secondary line 220 or 480 volt, primary line extension 8 kv to 13.8 kv to supply the distribution transformer also 69 kv to supply voltage in our substation. At first in making design and estimate is not easy, but for five year in experience I'm now on the stage where sometimes I'am bored because do not challenge anymore for that I would share how.

First and foremost you need to identify what your customer's applied for. Say for example your customer applied a three 500 kva transformer 240/480 volts at secondary side. The first move that you are going to do is an actual measurement from the tapping pole to the exact location of the service entrance, while you are in the field it also make the actual location of pole, the transformer pad etc. in draft drawing.  Considering all the data needed in you design are all gather. How many pole are needed the wires, the type of construction both primary and secondary construction now its time to draw the final drawing. So now I'll give the techniques on how to separate so you will not be worried about the materials need on the electrical distribution line projects. here it is...

1. Number of Poles like..
25'/200 cp - 2
35'/300 cp - 5

2. Type of constructions like..
3TJ500 S - meaning complete accessories of 3-500 kva transformer
C7 - 2 - dead to dead primary line construction
C2 - 1 - angle 30 to 60 degree primary line construction
C1 -  2 - for straight line primary line construction
 e1-2 - Down guy construction
e14 - part of down guy construction

3. Wire
#2 acsr wire - 1000 meters
#2/0 acsr wire- as tighten to pin insulator
3/8 guy- 24 meters
#336. 4 acsr wire for transformer banking wire


4. others material needed
cut-out fuse
fuse line
terminal plug
pole band
jarp
terminal plug
bail clamp
hot line clamp
strain clamp
pvc tape
connectors
and many other in depends upon the situation

That's all the final is to get the price for each item also the labor of the installation, In our company that I work. We only input the above materials also input the work for installation the computer program will automatically give the total amount.

note: if you need question and query pls. don't hesitate to comments.. I'am willing to help..

above english grammar are subject for correction thanks for dropping by.

The post was already deleted..

here you will anymore see the post it was already deleted...

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