vishwas jain

Submitted to

Mr. Damodar kumawat

(h.o.d. eee dept.)

submitted byVishwas jain

11emhex062

submitted by vishwas

Power Supply Installation (PSI)

Overhead Equipment (OHE)

Remote Control equipment◦ RCC [Remote Control Center]

◦ SCADA- [Supervisory Control and Data Acquisition system]

Types of traction system

Advantages of using electric traction system

Types of electric traction

advantages of electric traction

locomotives

Tss , sp , ssp

Ohe equipment

Breaking

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Action of drawing some thing over a surface

Or the system which uses electric power for traction is called electric traction

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Non electrical traction 1) steam engine drive2) internal combustion-engine drive

Electrical traction1) self contained vehicles

2) vehicles which receive electric power

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submitted by vishwas

Cleanliness

Low Maintenance cost

Less Starting time

High starting torque

High acceleration

High traffic handling capacity

Easy Breaking

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Electric Traction Systems

DC Traction AC Traction

1- phase 3-phase

Multi system

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power

supply

•1500 v dc supply is used

•Both ohe & third rail method can be used

Dc series

motors

•High starting torque

•Smaller weight to H.P ratio

•Low maintenance cost

•High rate of acceleration & retardation

substation

•Fed with 33 to 133 kv 3-phase power supply

•Convert high vtg 1500 or 3000 v ac supply

•Basically contain x-mer rectifier & converter ckts

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Power

supply

•25 kv electrical power supply is use in ohe

•High vtg is use to reduces the losses in overhead lines

•Because of high vtg is use distance b/w s.s increases

•Third rail method cant be use in ac system

substation

•Sub station is fed to 132kv supply

•This high vtg is converted into 25 kv ac supply

•Sub station in ac system are cheaper

•Basically contain x-mer

•Some times frequency converters are also use at ss•

Series dc

motors

• In locomotives dc series motors are use

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I. High Starting torque

II. Low maintenance cost

III. High rate of acceleration & retardation

IV. Easy speed control

Disadvantage

I. Only one disadvantage is the necessity of locating ac/dc conversion substations at short distance apart.

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Advantage of 25 KV AC Traction over 1500 V DC Traction

Reduced requirement of copper, steel for supports and cement because foundations are lighter.

Increased substation spacing - 50 to 80 kms as compared to 8 to 10 kms for DC traction.

There is direct application of industrial frequency.

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submitted by vishwas

submitted by vishwas

Traction Substation or feeder post

(SSPs)-Sub Sectioning Post

SP

Ohe (over head equipment)

Centenary , droppers , contact wire

Running rails work as return path

Boosters transformers

Pantograph

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submitted by vishwas

substation

Single

phase ac

Dc

substation

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SCHEMATIC DIAGRAM OF TRACTION SUB STATION

Traction Sub Station

R,Y R,Y (220/132/110 Kv)

LOCO

RAIL

OHE

25 KV AC Single phase

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TSS 1 TSS 2

Neutral section

(SP)

(SSPs)

(SSPs)-Sub Sectioning PostSub-Sector

Sector

SCHEMATIC DIAGRAM

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Ratingsfor l.v. 42kv

for hv 120kv

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A short section of insulated dead over-head equipment which separates the sectors fed by two adjacent substations which are normally connected to different phases.

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OHE Arrangement

Mast

Mast

Centenary Wire

Contact Wire

Dropper

Automatic Tensioning

Device

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Auto Tensioning Device (ATD)submitted by vishwas

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Contact wire –◦ cross sectional area - 107 sq.mm.◦ diameter - 12.24 mm◦ normal tension – 1000 kg◦ breaking load – 3905 kg

Catenary wire –◦ cross sectional area - 65 sq.mm.◦ diameter – 10.50 mm◦ Normal tension – 1000 kg◦ breaking load – 3920 kg

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DROPPERS◦ A fitting used in overhead equipment

construction for supporting contact wire from catenary

BONDS◦ An electrical connection across a joint in or

between adjacent lengths of rail

(structure bond, continuity bond, cross bond etc.)

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submitted by vishwas

Modern microprocessor technology and the availability of efficient and compact power components have changed that picture. In 3-phase AC locos, the input (single-phase AC) from the OHE is rectified and then 3-phase AC is generated from it, whose voltage, phase, and frequency can be manipulated widely, without regard to the voltage, phase, frequency of the input power from the OHE

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submitted by vishwas

submitted by vishwas