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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