Monday, December 20, 2010

CrazyEngineers Forum - Electrical & Electronics Engineering

CrazyEngineers Forum - Electrical & Electronics Engineering

Blackberry Desktop Software for Mac OS finally released

Posted: 20 Dec 2010 01:43 AM PST

About time, eh? Wintel users have been enjoying the spoils of WiFi music sync on their BlackBerry handsets for the past few months now, but if you're still stickin' with RIM (through the thick and thin), and you just so happen to roll primarily on OS X, there's a new piece of software that you should consider. BlackBerry Desktop Software 2.0 for Mac OS has just been let loose, and it's a pretty substantial update. Aside from supporting WiFi music sync in official fashion, there's also a new device switch wizard and the ability to import and sync photos and videos with iPhoto and iTunes. She's waiting for you there in the source link -- all 39.713 megabytes. You know what to do. – via Engadget

Looking for DVD player remote..........................

Posted: 19 Dec 2010 07:07 PM PST

Hello friends,

I have lost my DVD player remote and now I am looking to get another new universal remote which can work with my DVD player and with many other items. So please suggest me the best website where I can get the best quality universal remote. Please help me asap.

Earthing File from " SCHNIDER ELECTRIC"

Posted: 19 Dec 2010 04:46 AM PST


Earthing System is very important issue for electrical distribution , so I attached files talking about types of earthing , I hope it benefits you all.



EARTHING_SYSTEMS_PPT


Get Your Short Link With us & Forex market
Get Your Short Link With us & Forex market

< go to the link , the download link will be shown within seconds >


Thermal Power Station , Steam Power Plant , Electricity Production , Operation and Commissioning

Reveres Power Protection., Theory & Setting .

Posted: 19 Dec 2010 04:16 AM PST

Reverse Power Protection.














1- Protection against overspend 32G (# 1).

In case of Turbine Failure, the Turbine is tripped and then the Generator is tripped by operation of reverse power relay to prevent overspending of the Turbine generator unit.


2- Protection against generator motoring 32G (#2).

-Generator motoring protection is designed for the prime mover or the system, rather than for the generator.

- With steam turbines, Turbines will overheat on low steam flow, motoring results from a low input To the Ac Generator,

- When This I/P can't meet all the losses, the deficiency is supplied by absorbing real power from the system.

- since field excitation should remain the same , the same reactive power would flow as before motoring , thus, on motoring the real power will be into the generator, while the reactive power may be either flowing out or into the generator


















Setting of Reverse Power Relays


Data for setting calculations
-Rated Capacity of Generator -------- 440,000 KVA
-No Load Loss of Generator --------- 1,785 KW
-No Load Loss of Turbine ---------- 1,350 KW
-No Load Loss of TG unit ---------- 3,135 KW
-Permissible Motoring Time ------- 60 Sec.
-Relay Constant ------------------- 1 P.U. = Generator KVA






Setting Of Reveres Power Relay 32G ( #1 )


1- Reverse Power Trip Level


Trip Level < No load loss of TG unit * 0.3
= 3,135 * 0.3
= 940.5 KW
Pick up = Trip level / relay constant
= 941 / 440,000
= 0.0021 P.U.
Setting = - 0.002 P.U. ( 880KW )


2- Reverse Power Trip Delay


Trip Delay < Perm. Motoring time (60 Sec.)
Setting = 50 Cycles (1 Sec.)












Setting Of Reveres Power Relay 32G ( #2 )


1- Reverse Power Trip Level


Trip Level < No load loss of TG unit * 0.5
= 3,135 * 0.5
= 1,568 KW
Pick up = Trip level / relay constant
= 1,568 / 440,000
= 0.004 P.U.
Setting = - 0.004 P.U. ( 1,760KW )


2- Reverse Power Trip Delay


Trip Delay < Perm. Motoring time (60 Sec.)
Setting = 750 Cycles (15 Sec.)
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