02_ LV_Power Control Centers

7/30/2019 02_ LV_Power Control Centers

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PowerControl Centre

Type TFA flexible system withinnovative features

Electrical & Electronics Division

LARSEN & TOUBRO LIMITED


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Compartment housingACB withmicroprocessor based

release.

L&T sets a new standard of service,reliability and convenience in the field

of low-voltage power distribution with

type TF, its latest Power ControlCentre.

Type TF crystallises the knowledgeand experience gained from over

35 years in key industry sectors. Itsflexible design facilitates adaptation tosuit diverse requirements. Type TF

switchboard can withstand extremeambients and provides greater safety,accessibility and ease of installation.

The design of TF meets the latestnational and international standards.

L&T SwitchgearA tradition of settingNew standards

At L&T, the Total Quality Managementconcept puts customer delight at the

focus of all operations.

An insight into all aspects ofCustomer requirements combined witha sustained effort to infuse innovative

elements of design into existingproducts have helped L&T setinternational benchmarks in low

voltage power distribution systems.Rigorous in-house quality checksduring assembly, backed by state-of-

the-art quality control infrastructure -systems certified for ISO 9001 (1994)by BVQI - form the core of all

operations.

PCC type TFhousing intelligentelectronic devices.

PCC type TF designedspecifically with multi-tier

arrangement.


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PCC type TF is a product of L&T'scomputer integrated manufacturing

facilities. It introduces an innovativeconcept in India: the InterleavedBusbar System, a concept that

reduces power losses in the system.TF incorporates L&T's latest C-POWER

ACB, in fully drawout construction up

to 4000A. Auxiliary equipment andcontrol accessories can beaccommodated in the same or

adjacent compartment.

The ACBs can be mounted in multi-tier

arrangement. Each ACB feeder iscompartmentalised and has a hingeddoor for independent access during

maintenance. The frame of eachvertical section is assembled using 'C'profile steel members which are

rivetted together to enhance structuralstrength. The compartment height isadjustable for maximum utilisation of

panel space, in steps of 150 mm.

4000A ACB racked out

in maintenance positio

Front facia offers total protection even

when compartment door is open.

TECHNICAL SPECIFICATIONSDimensions (in mm):Height.. 2430 (2550 with

Ventilation hoods)Width 600, 800Depth 944, 1444

Rated ServiceVoltage. 660V acRated Frequency 50/60 Hz

Busbar Fault LevelWithstand. 50 kA for 1 sec*Busbar System TPN-E (with

Manually isolableneutral) or TP-E

Maximum Rating

Of Busbar 4000A

(higher ratingson request)

Cabling Space. 620 600 forpower cabling

2 455 362.5

for control cabling.Degree ofProtection IP54 as per IS 2147.

* Up to 100kA/1 sec. Available on request


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Busbar System

The busbar system can be eitherTPN-E or TP-E. Each vertical section isprovided with its own set of vertical

droppers and vertical earthbar.

Horizontal busbar run throughout the

length of the switchboard. Auxiliarybusbars have a separate chamber.

Interleaved Busbar System

In the conventional busbar system,conductors of each phase are

grouped together. At higher currentratings in each phase, more than oneflat of busbars are used. These flats are

placed quite close to each other. As acompounded result of 'skin effect' and'proximity effect', current distribution in

each flat of the same phase is uneven. Italso results in unequal temperature risein different phases. At very high

currents, say above 2500A, anyenlargement of the cross section ofconductors does not result in aproportionate increase in the current

carrying capacity of busbars.

The interleaved Busbar System,

therefore, offers a cost effectivesolution, specially at high currents.In this busbar system, conductors of

each phase are placed as R-Y-B-R-Y-Binstead of RR-YY-BB. Such anarrangement offers much lower

impedance. Also, impedance of eachphase is fairly even. This results inuniform temperature rise in all three

phases.

Interleaving of busbars also reduces

dynamic forces caused by shortcircuits, enabling the system towithstand much higher fault levels.

The Interleaved Busbar System thusenhances the busbar current carrying

capacity, and therefore enablesoptimum utilisation of busbarconductors. Reduced power loss

leads to energy savings. The reductionin temperature rise, especially importantin high ambients, increases the reliability

and life of equipment, and also reducesventilation and coolin re uirements.

Interleaved and totally

Insulated busbar system

With moulded supports.

Interleaved link work for

buscoupler


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Total Protection of Busbar

The horizontal busbars and vertical

droppers are enclosed in separatechambers. Horizontal busbars, verticaldroppers and incoming links are totally

sleeved with heat shrunk PVC. Thisensures protection against accidentsdue to tracking caused by dust, humidity

and vermin. All joints on horizontalbusbars can be providedwith snap-fit joint shrouds to provide a

completely insulated system.

Moulded Support System

Busbar supports are made offibreglass reinforced thermosettingplastic. Individual supports for each

phase eliminate risk of trackingbetween phases.

Feeder

Type TF incorporates L&T's latestC-POWER ACB. Drawout C-POWER

ACBs rated from 800A to 4000A can

be accommodated. In addition, TypeTF can house fuse switches, MCCBsand capacitor feeders in fixed versions.

Up to six fuse switch or MCCB feedersand up to four capacitor feeders can be

accommodated in one panel.

ACB cradle with spring loaded safety shutters

and telescopic rails. Auxiliary equipment can be

mounted in same compartment.

Breaker in 'Test Position',

with the door closed.

Storage slot for

racking handle.

Panel is designed to accommodate

ACB, MCCB and switch-fuse units


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Shrouded linkwork ensures

complete safety in cable alley.

Cabling

The cabling chamber of each panel is atthe rear and is separated from thebusbar zone and ACB compartment.

The cabling space can be extendedto accommodate extra cables by anadd-on chamber. To enhance safety,

the control terminals can be mountedin a separate compartment below the

ACB chamber, away from power cables.

Safety Interlock

Door interlock ensures safety ofoperating personnel.

The door cannot be opened unless

the breaker is in 'Isolated Position'. The breaker cannot be racked in or

out of the 'Service Position' unlessthe door is closed.

Defeat facility is provided to

facilitate testing/inspection.

Wide cable alley facilitatestermination even for a large

number of cables.

Typical foundation plan

with cabling space details.

Cable alley door with locking

facility

Door interlock

defeat facility


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Other Features

The TF boards can be coupled with

MCC type TQ for an economicaldesign: Power-cum-Motor ControlCentre.

Separate 320mm wide relay panel

accommodates additional relays,kWH meters

Facility for busduct termination.

Door camlock engages the door infirst quadrant of its turn andcompresses the gasket in the

second quadrant. It is supportedby a double lip door gasket for dustproofing.

Up to 13 auxiliary busbars can beaccommodated in a separateauxiliary busbar chamber.

Clearly defined, tooled-up link work

and dropper concept avoidcriss-crossing of links and cablesand facilitates multi-tier feeder

arrangement.

Flexible compartment heightseffectively utilise available panel

space.

Click fit busbar joint shrouds.

Control wiring using wire harnesstechniques where wire routing

charts are prepared on computer.Identical wiring is carried out for

identical panels. This helps faulttracing and facilitates site changesor modifications, when required.

Ventilation with hoods and louvres

for busbar rating of 2500A and

above.

PCC type TF with a panel to

accommodate protection

relays

Auxiliary busarrangementand interpan

wire

terminations.

Well defined interleaved linkconnection between

horizontal busbars and ACB.

Adjustable compartmentheights for effective

utilisation of space.


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Overview of switchboard assembly shop.

Concurrent engineering integratesdesign and manufacturing processes.

Air Circuit Breaker assembly shop.

Stage inspection during assemblyensures reliability.

EBG Electrical Systems & Equipment

LARSEN & TOUBRO LIMITEDPowai Works, Post Box 8901Saki Vihar Road,MUMBAI 400 072

02_ LV_Power Control Centers

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