I am in the process of making the cost benefit analysis for installation of VSD with new 2600 HP, 6.6 KV motor on boiler Feed Water Pump application. I have already received the cost of doing this job. The cnectrifugal pumps are driven by this motor. Pump capacity is 250 tph at 200 bar. Boiler...
How does the problem of weak infeed and power swing on t/line affects a distance relay? Does these have any particular problem with POTT scheme. How are they implemented. What is echo method for weak infeed problem elimination.
I will also appreciate if anyone can give a brief description of...
The motor is driving boiler feed water pump which is centrifugal.
Important thing to mention here is that the air filters were being fabricated locally instead of buying from TECO. Maybe you guys have helped identifying the true cause.
We will inspect for the equalization holes next week and i...
Bailey INFI90 FDI (Foreign Device Interface) normally gives error codes for troubleshooting which you should verify by monitoring the module configuration using CADTXT or WIntools or Composer.
Last year we opened up a 6.6 KV 2600 HP motor as the winding temperatures were nearing 150 C. Upon inspection we found that bearing oil from sleeve bearing had seeped into motor. Combined with small dirt particles, the sticky material was all over the windings and ari paths. Subsequently the...
Why is the CT error specified in terms of 20 times rated sec current? What is the signifance of this number? Can be it be derived performing calculations on basic CT model?
Thanks in advance
I would like to thank all for the response to my question.
Is there any latest edition, after 2000, of PRAG by Alstom or art and science of relays by GE?
I was unable to open the areva-td.com site.
I have managed to get the subject book. It looks good. I will study it in detail and see.
How is this book as compared to PRAG from Alstom? I want to know others opinion on this books latest edition before buying it.
THe other book in which i was interested in is power system analysis by the same author. Comments on this are also required.
THanks in advance.
Reference standards IEC 34-1, BS4999, AS 1359.32
TEMPERATURE RISE AND MOTOR LIFE
'Life' refers to the life of the windings before they require rewinding. The temperature rise of the windings (and the insulation materials), of an electric motor is critical to the life expectancy of the motor and...
On steam turbine units, operating the unit with lowest possible steam pressure helps in improving heat rate due to following reasons:
1. Lower leakages in the furnace/boiler which means low losses.
2. Turbine governer valves will remain close to full open which will result very low throttling...
Check this article from University of Honk Kong's website. You can download it easily.
Fuzzy PID Controllers
for Industrial Applications
G. Ron Chen
Lecture for EE 6452
City University of Hong Kong
Can we perform the same equalization technique to car batteries to enhance their life like we do in power facilities? Will it improve their life as well.
check this site:
http://www.usbr.gov/power/data/fist_pub.html
go to keeping motor winding dry
I have seen the graph in one of the articles posted here.
To me the insulation life at rated temperature is 40 years. For motors winding keeping them free of dust, moisture and oil is extremely...
Gases and vapors are subdivided into groups on the basis of :
1. Ignition Temperature.
2. presence(always, sometimes, etc) of these gases / vapors in atmosphere.
There are two classifications, one is Class/Div/Group
and other probably european in class/zones.
check...
Lastly could some body explain how is the value or ratio of bias to operating coil current is selected for biased differential and how is stablizing resistor calculated for high impedance relay.
