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What is DYNAMIC BRAKING??? How it is works???

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Apr 23 2017 (20:05)
Blog Post# 2247679-0     
అంద్రప్రదేష్ ప్రత్యేక హోదా^   Added by: అంద్రప్రదేష్ ప్రత్యేక హోదా^  Apr 23 2017 (20:07)
What is DYNAMIC BRAKING???
A half-century ago, when diesel locomotives were replacing steam engines, a revolutionary breakthrough - dynamic braking - was making freight operations safer and more efficient.
Dynamic braking is the method of train braking whereby the kinetic energy of a moving train is used to generate electric current at the locomotive traction motors.
It works like this: While the
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train is coasting, the engineer, using an eight-notch controller similar to the throttle, energizes the traction-motor fields, causing the motors to act as generators. The resistance of the motor field acts as a brake on the locomotive, which in turn helps to slow the train. The electric current generated by the motors in the dynamic-braking mode is a waste product and is dissipated as heat in banks of resistors located in the locomotive carbody.
Dynamic braking is not a substitute for train air brakes (electronically controlled or otherwise), but a supplementary system that provides an additional means of train-speed control.
Initially, dynamic braking was seen mainly as a tool for mountainous territory, where freight-car wheels and brakeshoes were prone to overheating on long downgrades. Diesel locomotives for trains operating in level territory, relatively light trains like passenger trains, and slow-movers like yard engines, did not have dynamic braking. Large railroads like the Pennsylvania and Santa Fe would specify dynamic braking for diesels intended for use in mountain districts, and acquire units without "dynamics" for flat country. Substantially level railroads like Soo Line and Florida East Coast would eschew dynamics altogether.
Eventually, the desire for greater flexibility in locomotive assignment, as well as improvements like extended-range dynamic braking, which is effective at speeds as low as 6 mph (the "extension" is in speed), led to the adoption of dynamics as standard equipment for nearly all new diesels, freight and passenger. Though most diesels built recently have been big, road-haul units with dynamic braking, many older, non-"d.b." units are in service on locals and in yards.
While dynamic braking is used to control train speed all over the railroad network, it is still of vital importance in areas with heavy grades. In steam days, helper locomotives would cut off a train at the top of a grade. Today, diesels use their tractive effort to help move a train up one side of a hill, and dynamic braking to ease it down the other side. Indeed, in some spots like Cajon Pass in California, rules are in place to prevent a train from starting downgrade unless it has a specified number of units with functioning dynamic brakes.
The only external evidence of dynamics is the presence of grilles covering the resistor grids. These are found at the rear of the long hood under the radiator overhangs on General Electric units, and directly behind the cab just below the top of the long hood on newer General Motors products. Until the advent of the SD50 model in 1981, the dynamic braking resistors of GM locomotives were located in the middle of the long hood directly above the diesel engine in a pronounced bulge or blister topped by one or two cooling fans on the roof.
The use of dynamic braking is audible to the trackside observer in the form of a humming or whining sound that's quite distinct from the noise made by the diesel engine operating under load.
Dynamic braking's ancestor was regenerative braking, a feature found in some electric locomotives Regenerative braking was similar to dynamic braking in that wear and tear on wheels and brake shoes was reduced, and train-control was enhanced, but it was different in one important way: the power generated by the motors was not wasted by being dissipated as heat. Instead, the power was returned to the overhead distribution system With their motors functioning as generators, locomotives on downgrade trains could literally provide power to other trains going uphill.
The electrical characteristics of modern, rectifier electric locomotives and multiple-unit cars do not permit the return of power to the distribution system. Such rolling stock is equipped for simple dynamic braking.
A newer invention, electronically controlled pneumatic braking, may revolutionize train-handling in the decades to come.
what type of traction motors used in INDIANRAILWAYS???

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Apr 23 2017 (15:46)
Blog Post# 2247281-0     
అంద్రప్రదేష్ ప్రత్యేక హోదా^   Added by: అంద్రప్రదేష్ ప్రత్యేక హోదా^  Apr 23 2017 (15:47)
Traction Motors:

INTRODUCTION
CLW started Traction Motor manufacture from 1969 with Alsthom design of MG-1580 motors and TAO-659 motors and switched over to HS15250A, 850 HP Traction Motors for which technology was received from Hitachi, Japan. HS15250A Traction Motor production started in 1988-89.
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Now with the advent of three phase technology of locomotives from Bombardier Transportation, Switzerland, CLW has geared up to manufacture 1000 HP and 1500 HP state-of-the-art 3- Phase Traction Motors for freight (WAG-9) and passenger (WAP-5 & WAP-7) locomotives.

CLW also has in-house manufacturing facilities of other Electrical power and Control equipments i.e. Smoothing Reactor, Inductive Shunt, Master Controller, Traction Braking Switch, Electro-Pneumatic (EP) Contactors and Reversers.

The different type of Traction Motors manufactured at CLW are following:-
I. 3-PHASE TRACTION MOTOR TYPE 6FRA6068 & 6FXA 7059
3-Phase Tracation Motors type 6FRA6068 for WAG-9 and WAP-7 locomotives & 6FXA7059 for WAP-5 locomotive are being manufactured indigenously by CLW since the financial year 1998-99 & 1999-2000 respectively.With the production of 3-phase Traction Motor,CLW has entered the era of state of the art,3-phase technology.

(3-phaseTM type 6FRA6068) (3-phaseTM type 6FXA 7059)

II. HITAHI TRACTION MOTOR TYPE HS15250A
Hitachi traction Motor is one of the most critical and vital equipment in conventional Electric locomotives type WAG-7 & WAP-4 under production at CLW.The production of Hitachi TM is now from 2016-17 and onwards completely stopped.

( Hitachi Traction Motor Type HS15250A)
what is APU(Auxilliary Power Unit)???

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1164 views
Apr 16 2017 (21:49)
Blog Post# 2238497-0     
అంద్రప్రదేష్ ప్రత్యేక హోదా^   Added by: అంద్రప్రదేష్ ప్రత్యేక హోదా^  Apr 22 2017 (19:40)
What is APU(AUXILIARY POWER UNIT)???
APU is a self-contained system with its own small diesel engine coupled to low capacity compressor and alternator to maintain main reservoir pressure, charge battery, operate driver cabin HVAC system and other small loads as per customer requirement. The main engine is started only when the locomotive is actually required for movement or traction.
The control system on the locomotive continuously monitors the locomotive battery status and other important parameters like MRPR, Loco IDLING status, Engine temperatures etc. If the loco idling time is more than 10 minutes,
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the system shuts down the main engine and run the APU engine.
APU has a baby compressor, which produces compressed air and feeds to locomotive main reservoir to compensate the formation leakages.
While APU main engine is shut down and APU engine is running, The system continuously monitor the critical parameters and ensure they are with in limits.
MR pressure is maintained between 8 to 10 kg / cm 2 .
Locomotive batteries are getting charged and keeps the charging current with in limits.
Critical safety parameters both on main engine and APU are being continuously monitored. If any of the monitored parameters are deviated from the limits, Main engine is automatically started and APU engine is stopped.
The system is supplied complete with controls, sensors, accessories and application software.
Apr 21 2017 (13:44)
General

Entry# 1980     
Southern Railway^~
A-La-Carte Menu of IRCTC.

★★  Info Update
0 Followers
1845 views
Apr 21 2017 (00:06)
Blog Post# 2243915-0     
IR no more Safe^~   Added by: Southern Railway^~  Apr 21 2017 (13:44)
Finally found out the A-La-Carte Menu of IRCTC. Many want to know why PC sell the thali's at Rs 130 or 150 . Now you can compare with the items in the thali served with their respective price.
.
click here
Mar 28 2017 (15:18)
General

Entry# 1979     
Ashok
ER zone trains - longest distance running

★  General Travel
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8488 views
Mar 28 2017 (15:03)
Blog Post# 2213690-0     
Qualifed for JEE adv~   Added by: Ashok  Mar 28 2017 (15:18)
Here is a list of the longest PASSENGER, MEMU, EMU and DEMU trains run by various divisions of EASTERN ZONE
(Suggestions and improvements are always welcome)
#HOWRAH DIVISION
*LONGEST PASSENGER TRAINS
1. 53041/42 HOWRAH
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JAYNAGAR PASSENGER - 713.9KM
2. 53043/44 HOWRAH RAJGIR PASSENGER - 655.3KM
3. 53049/50 HOWRAH MOKAMA PASSENGER - 455.3KM
4. 53061/62 BARDHAMAN HATIA PASSENGER - 349.4KM
5. 53003/04 HOWRAH MALDAH FAST PASSENGER - 322KM
*LONGEST MEMU
HOWRAH division dont have any MEMU of its own
*LONGEST EMU
Suburban locals in HOWRAH KATWA section - 144KM
*LONGEST DEMU
73035/36 KATWA NIMITITA DEMU - 128.2KM
#SEALDAH DIVISION
*LONGEST PASSENGER
1.53131/32 SEALDAH MUZAFFARPUR FAST PASSENGER - 569.6KM
2.53139/40 KOLKATA JASIDIH FAST PASSENGER - 322.1KM
3.53171/72
53175/76 SEALDAH LALGOLA PASSENGER - 230KM
53177/78
53181/82
4.53179/80 KOLKATA LALGOLA PASSENGER - 223KM
*LONGEST MEMU
63141/42 SEALDAH RAMPURHAT MEMU - 225.8 KM
*LONGEST EMU
Suburban localsin SDAH LALGOLA section - 230KM
*LONGEST DEMU
73151/52 SEALDAH JANGIPUR ROAD DEMU - 259.8KM
#ASANSOL DIVISION
*LONGEST PASSENGER
1. 53525/26 BARKAKANA VARANASI PASSENGER - 455.2KM
2. 53523/24 ASANSOL BARKAKANA PASSENGER - 187.6KM
3. 53551/52
53553/54 JASIDIH DUMKA PASSENGER - 72KM
53555/56
4. 53511/12
53513/14
53515/16 MADHUPUR GIRIDIH PASSENGER - 38KM
53517/18
53519/20
*LONGEST MEMU
63553/54 ASANSOL VARANASI MEMU - 484.8KM
*LONGEST EMU
ASANSOL DIVISION donot have any EMU of its own
*LONGEST DEMU
73539/38 ANDAL JASIDIH DEMU - 142KM
#MALDAH DIVISION
*LONGEST PASSENGER
1. 53403 RAMPURHAT GAYA PASSENGER - 434.5KM
2. 53408 JAMALPUR RAMPURHAT PASSENGER - 263KM
3. 53417/18 MALDAH BARDHAMAN PASSENGER - 236.2KM
4. 53404 GAYA JAMALPUR PASSENGER - 174.4KM
5. 53405/06 RAMPURHAT SAHEBGANJ PASSENGER - 136KM
*LONGEST MEMU AND EMU
most of the track under MALDAH DIVISION is still not electrified, so MALDAH DIVISION donot have any MEMU and EMU of its own
*LONGEST DEMU
73451/52/53/54 JAMALPUR TILRATH DEMU - 54 KM
Mar 24 2017 (15:57)
Ticket Booking/E-Ticketing

Entry# 1978     
दिव्यांशु गुप्ता^~
Process of Vikalp scheme how to book tickets?

★★  Info Update
Mar 24 2017 (15:55)
Blog Post# 2209223-0     
दिव्यांशु गुप्ता^~   Added by: दिव्यांशु गुप्ता^~  Mar 24 2017 (15:57)
From 1st April #Vikalp scheme is being further expanded to provide shifting waiting list pass of 1 train across all categories of trains..
Source-click here
Mar 09 2017 (23:49)
Locomotives

Entry# 1977     
दिव्यांशु गुप्ता^~
Why Locos run with front pantograph up during winter, foggy conditions or heavy rainfall?

★★  General Travel
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11187 views
Mar 09 2017 (23:38)
Blog Post# 2192030-0     
Ashu^~   Added by: दिव्यांशु गुप्ता^~  Mar 09 2017 (23:49)
#FAQ
Why Locos run with front pantograph up during winter, foggy conditions or heavy rainfall?
Answer-- It is because of the dew during winter season. The extreme cold weather conditions cause the formation of dew which might affect the working of the servo motor which is connected to the small air tanks,which lifts the pantograph. The cool dew or even frost sometimes might jam the motor and affect the working of pantograph. If the rear pantograph is used during winter, the dew from the catenary(OHE) falls over the servo motor and affects
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its working thus affecting the lifting of pantograph. In the case of front pantograph, dew does not fall on the servo motor while loco is in motion.
The servo motor controls the air pressure in the small air pressure tanks located just below the pantograph(as seen in the picture); Thus indirectly it controls the pantograph movement.
Thus for hassle free working of servo motors of pantograph, front one is used during the foggy weather in winter season.
Pictures are for representational purpose only. Second pic shows the servo motors of the pantograph.
Happy to Share... :)
Mar 04 2017 (11:47)
General

Entry# 1976     
Kishor*^~
Retiring Room IR Booking Ease 3hrs to 48hrs

General Travel
1 Followers
10988 views
Mar 03 2017 (10:34)
Blog Post# 2184291-0     
Kishor*^~   Added by: Kishor*^~  Mar 04 2017 (11:47)
a travel question :
If you all are using RR : retiring room at any station, you can book it for PRS tickets too. you can book RR online and with hourly choice with minimum 3 hours and maximum 48 hours.
If you are not finding this 'Hourly booking' applicable to your source station or destination please put your grievance to RM through click here
at
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present the facility/software is available at few chosen stations...
Why only few?
why not all ?
IR collects equal fare whether you start your journey from Delhi or Mumbai or Manipur ...
Then why this slow doling out the facility ?
Help IR go digital ... but not bullock cart speed.... bullet speed ...by lodging Grievance with RM so that he will see so many IRIian requests flooding his computer and table...
Feb 25 2017 (14:14)
General

Entry# 1975     
Jayashree ❖ Amita*^
Rates of Meal Items in Mail / Express Trains

★  
Feb 25 2017 (13:07)
Blog Post# 2177667-5     
©The Dark Lord™~   Added by: Jayashree ❖ Amita*^  Feb 25 2017 (14:14)
Galti Railway ki bhi hai, social media or twitter pe catering charges post ker sakte hai to kya har train(jisme catering facilities ho) k har coach me proper menu with catering charge nahi chipka sakte!! 90% logo ko to pata hi nahi hota ki real rate kya hai isliye unke paas pantry car vendors ki baat pe yakin karne k alawa koi rasta nahi bachta. BTW is image ko FAQ me add ker do, kum se kum IRI pe to logo ko sahi jaankari mile.
Feb 07 2017 (21:56)
Site-related

Entry# 1974     
दिव्यांशु गुप्ता^~
How to post News on Indiarailinfo.com ?

★  Site-Related
0 Followers
15235 views
Feb 07 2017 (21:55)
Blog Post# 2155194-0     
दिव्यांशु गुप्ता^~   Added by: दिव्यांशु गुप्ता^~  Feb 07 2017 (21:56)
Watch my another IRI tutorial video
How to post News on IRI....
Like-Share-Comments-Subscribe :P
Page#    1461 FAQs  next>>

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