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...
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
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.
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.
Can somebody explain the reason of faster speed for high impedance differential normally used on busbars as compared to Baised Differential used on transformer, motor or generator?
What i have studied from a literature is that high impedance busbar DP operating time is 1 cycle whereas...
Dear All,
At our power plant, we want to install the subject protection relay(s) in our 132 KV switchyard. The purpose is to open the 132 KV line breakers in event of under/over voltage and frequency to keep the power plant running in island mode. We have a single busbar scheme and two lines in...
What is reliability Centered maintenance and how is it different from PM, Pdm and Failure Analysis that we already do at our job?
Please explain the difference.
Dear All,
We have Bailey INFI90 installed at our plant. HMI is Conductor VMS 3.0 based on DEC alpha 255 servers. As DEC has stop producing these systems, we are in a fix in getting spares for the system. ABB have recommended us upgrade. Rosemount has also come up and said that they can upgrade...
Can somebody help me with capacity testing of the 125 V DC 60 cell battery bank?
The nameplate rating on the C&D batteries is as under:
Model: XT1L-43
Amp-Hour: 3340.9 for 15 min; Final Voltage: 1.67 V
These are Vented Lead Acid batteries.
What i understand from the manual is that AH for the...
