LTL Transformers (Pvt) Ltd - A Subsidiary of LTL Holdings (Pvt) Ltd - Three decades of manufacturing excellence
←
→
Page content transcription
If your browser does not render page correctly, please read the page content below
LTL Transformers (Pvt) Ltd.
A Subsidiary of LTL Holdings (Pvt) Ltd.
Three decades of manufacturing excellence ISO 9001:2008
ISO 14001:2004
OHSAS 18001:2007
Certified Company
ltl transformers (pvt) ltd.
VISION LTL was established in 1982, as a joint venture The awards the Company has received for their
of Ceylon Electricity Board the Power Utility of Sri transformers hail their achievements locally and
“A GREAT GLOBAL COMPANY THROUGH TECHNOLOGY & PEOPLE”
Lanka and European Investors initially to produce an internationally and underline the reason for their 100%
indigenous transformer. The Company’s production local market share and rapidly growing export orders.
line developed with an ongoing Technical Collaboration
Agreement with ABB AS of Norway and today the All our transformers are optimized to meet customer
Company’s state of the art production facilities satisfaction with regard to energy loss, noise level,
manufacture very high quality transformers conforming dimensions and weight. Precise and thorough quality
MISSION
to international standards and meet the entire control before, during and after each stage of the
Sri Lankan requirements while about 50% of its manufacturing process ensures that all LTL products
productions are exported. meet the very highest international quality standards.
DELIGHT THE CUSTOMERS BY PROVIDING TRANSFORMERS & The transformers are renowned for their high
SWITCHGEAR PANELS ON TIME WITH EXCELLENT QUALITY Over time the production range expanded to special performance and proven reliability.
transformers such as Earthing, Dual Ratio, Isolation,
Auto, Rectifier Transformers, Switchgear Panels, We offer a full range of after sales services to all our
Package Substations and a host of others. customers to ensure the reliability of our products.
Product Range
Advantages of Hermetically Sealed
Transformers:
Power & Distribution Transformers: Compact and Package Substation with
• Hermetically Sealed Transformers are used in high
• Capacity from 5 kVA up to 5000 kVA Transformer:
humid environments, where there is limitation of
• Varying voltages up to 33 kV • Oil immersed Transformers up to 2000kVA ; 33kV
maintenance services and limited space for installation
• Frequency : 50/60 Hz
such as pole mounted transformers, package or
• Tap Types: Off Circuit Tap links/Off Circuit Tap Changer/ Special Transformers:
compact substations.
On Load Tap Changer • Rectifier / Converter Duty Transformers
• The oil will not come in contact with air, thus ensuring
• Temperature Rise: as per customer requirements. • Earthing / Grounding Transformers
preservation of its dielectric integrity.
• Silicone/Mineral Oil or other fluids filled Transformers • Isolation Transformers
• Virtually no maintenance required, e.g. no checking
as per customer specifications. Biodegradable oil is also • Completely Self Protected Transformers
required of silica gel breather, and no need to monitor
available for environmentally sensitive areas. • Dual Voltage Ratio Transformers
water ingress.
• Cooling: ONAN / ONAF • Multi Winding Transformers
• Transformers occupy smaller space leaving more room
• Auto Transformers
for connections in compact installations.
Tank and Cooling designs: • Low Voltage Air Cooled Transformers
• High reliability of the tanks which is proven by stringent
• Hermetically Sealed type Transformers with corrugated • Pad Mounted Transformers (Dead Front) as per ANSI
fatigue and over pressure tests carried out on
tanks (fin walls) standards.
transformers of this type.
• Hermetically Sealed type Transformers with gas
cushions
• Conservator type Transformers with free breathing
Package Substation Configuration and Components
HV Compartment
Extensible & Non
LV Compartments
Extensible Ring Main Units
Transformer • LV Distribution Board
(RMU) with following
Compartments • LV Control Panel with
options:
Oil Immersed Incomer ACB & Outgoing
• Switch Disconnectors
Transformers with choice MCCB
• Fuse Switches
of arrangement for • Automatic Power factor
• Vacuum/SF6 Circuit
termination with HV & LV Correction Panel
Breakers
Switchgears Panels • LV switch fuse units
• Current & Potential
• Instrumentation &
Transformers for Metering
Metering
Package/Compact Substations
& Protection
Accessories & Controls
The Package Substation is a compact arrangement, which Internal Lighting & Door Limit Switches, Earth Fault Indicators for Network, Door Stoppers,
simplifies conventional substation designs. Substation Steel Meshes to Cover Louvers.
housing is divided into three compartments i.e. the HV
compartment, the transformer compartment and the LV
compartment. APPLICATIONS
Reduced installation space, which will be advantageous in case of dimension limitations &
significant FEATURES high price of land.
• Design conforms to IEC 62271-202 and customer
specified other standards Short erection time & maintenance free solutions for your energy supply.
• Fully compartmentalized design
• Removable roof with single lift complete unit They are ideally suited for new residential and commercial complexes as it can be placed on Ground,
• IP 23 standard degree of protection available for partially or totally below / above ground level.
enclosure as per IEC (higher IP class can be provided if
required) Mainly used by Power Utilities, Multiplexes, Hotels, Hospitals, Shopping Malls, Software Parks,
• Designed to withstand electrical impulses, thermal Residential Complexes, Airports etc.
and dynamic stresses
• Compact, and occupies less floor space
• Easy to install, operate and maintain, with a theft
proof design
• Special durability in extreme weather conditions
• Tailored configuration to meet customer requirements
• Enclosure with guaranteed corrosion protection
MAIN ADVANTAGES
• Reduced Electrical losses as Package Substations
can be provided near load centres
• Cost effective
• A high degree of safety and operational reliability is
achieved by HT and LT Switchgears and protective
relays, to avoid overloading
• Reduction in logistic costs as Package Substations are
delivered as single units
• Low civil/ foundation cost LTL Package Substation installed in Jordan
Design, Research & Development The Core Design
LTL Transformers are designed to fully meet all the latest Special software programs developed in technical The core is made from high-quality, grain-oriented silicon steel and Main characteristics
national and international standards, including IEC, BS, collaboration with ABB Norway and the in-depth expertise sheets are cut to length by latest GEORG cutting line. The stacked core • The 450 cut of the core sheets and step-
ANSI and often even exceeding the standards applicable of our engineers and designers ensure the accuracy and provides a superior flux path by utilizing a step-lap that joins the core lap design guarantees optimum flow of
to concerned markets. reliability of all designs with respect to optimization of legs to the top and bottom yokes. The effective support for the core magnetic flux in the core joint area resulting
various factors. together with a step-lap joint ensures optimum performance in relation reduction in no load loss and no load current
With a commitment to Continuous Improvement, paving a to existing currents, sound levels and iron losses. • Low sound levels are achieved using the
way for vertical integration, the Research and Development Our main concerns are step-lap stacking pattern
wing of LTL Transformers (Pvt) Ltd has been painstakingly • Improvement of efficiency by reducing on load and no We do our core design so that the core efficiently fills the opening in the • Various types of magnetic steel (Laser
and continuously working to develop new products, load losses coil, leaving a minimum of unused space. The short yoke between the treated / Amorphous etc) are chosen to
better and improvised manufacturing processes, use of • Emphasis on lowering costs by economizing the use legs of the core reduces the external flow between the active leg core match the desired loss level
modern technology and better materials for the benefit of of materials and planning manufacturing processes materials, resulting in an increase in efficiency. The stacked core is more • The simple supporting structures and
customers. This would not only be economical in terms of that would optimize labor inputs uniformly and firmly supported with metal or laminated wood clamps to clamping devices of the core contribute to
cost and energy, but would also give an all time superior • The designs are satisfactory with respect to dielectric prevent movement of the core structure so as to improve sound level the compactness of the design
product, providing total satisfaction to the end user. strength, mechanical endurance, dynamic and thermal characteristics and mechanical strength to withstand short circuit forces.
withstand of winding in event of short circuits
• Using available materials economically in order to
achieve lower cost, lower weight, and reduce size and
better operation performance
• Specified performance characteristics such as
temperature rise, noise level, impedance etc.
• Mechanical design, final finish and accessories
• Ability to withstand high impulsive voltage surges
• Overload capacity
• Elimination or reduction of stray losses, hot spots,
electrical gradients, etc. by electrical and magnetic
field analysis
Winding Assembly Drying and
The low voltage winding is done with foil or rectangular Corrugated oil ducts extend along the height of the coil The active part of the transformer consists of the magnetic core; Oil Filling
conductor extending along the full height of the coil. The to provide cooling in the winding. The staggered, diamond windings and other accessories such as tap selectors etc. Before
layer to layer insulation is a thermally upgraded kraft paper epoxies bonds help assure effective oil flow through the The entire finished core and coil assembly
drying all connections between windings and bushings and the
which is coated with a diamond pattern of epoxy adhesive. winding. Normally tapings are provided in HV winding. will be dried by the transformer core oven.
connections between the high voltage tapings and the tap changer
The temperature and duration of the
are made. All the high and low voltage leads are supported rigidly
The high to low insulation barrier is fitted over the low Both copper and aluminum material can be used for drying process ensures the curing of epoxy
so that there will be no dangerous movements during severe faulty
voltage winding and high voltage winding is wound winding coated insulation and removal of moisture
conditions. Tapings are normally provided at high voltage winding due
directly over the low voltage to ensure a high strength coil within active part assembly.
to lower current in it.
assembly. For HV winding enameled insulated round or SPECIAL FEATURES OF WINDINGS DESIGN
rectangular conductors are used. • Any high voltage ampere turn asymmetry which, After the drying process has been
High quality laminated wood or pre fabricated steel clamps are used
might occur is compensated automatically by an completed the unit will be tanked and filled
for clamping. High quality press board insulations are used to support
appropriate internal current distribution in the low with degassed oil under vacuum within a
the windings axially. Pressboards are used as phase barriers between
voltage foil. minimum period of time.
the high voltage windings as well as between core and low voltage
• High short circuit strength due to use of epoxy dotted windings. The design and the process ensure adequate clearance
paper as inter-foil and inter layer insulation between various components and parts to ensure uniform and
• Accurately located taps in HV winding and LV foil optimum electric field distribution which gaurantees long life of the
design keep unbalanced ampere-turns to a minimum transformer.
which make the design stronger under short circuit
stresses.
• Minimum stress loads on the dielectric
• The layer-type winding results in a low ground
capacity, which gives a nearly straight line surge
distribution throughout the winding. A compact, high-
impulse-strength coil is the result.
• Low eddy losses
• More even heat distribution through the windings
• Automatic winding techniques can be used
Fabrication Testing
The Sealed type Transformer tanks are made of high All welds are tested, ensuring 100% leak proof seams and All transformers are subjected to the full range of specified Following type/special tests are carried out either at the
quality pre formed corrugated fin walls made out of cold mechanical strength. tests as per international standards such as IEC, BS and customer’s request or as part of a verification of a new
rolled steel. It is ensured that finished tanks meet over ANSI. design. All tests are performed within the factory except
pressure requirements & permanent deformation limits Most of the fabricated tanks are Galvanized in our own hot for dynamic short circuit tests and impulse tests which are
specified by international standards. dip galvanizing plant, according to international standards Following routine tests are carried out on each transformer done at internationally accredited third party laboratories
and then powder painted. Other non galvanized tanks are before it is released for dispatch, such as KEMA, Netherlands.
Vertical bending machine helps to form the corrugated shot blasted in order to remove all traces of grease, rust • Preliminary Insulation Resistance
tanks only with one welded seam, which is a specialty in welding slag and other impurities. Immediately after shot • Vector Group The type/special tests are,
our products. blasting the tanks are painted with primer and finishing • Voltage Ratio • Short Circuit
coats. All the items are powder painted to provide a • Winding Resistance • Lightning Impulse Voltage
In conservator type design, high quality steel sheets smooth attractive final finish. • Oil Dielectric Strength • Sound Level
are used for tank fabrication. For cooling pre fabricated • Separate Source Voltage Withstand • Temperature Rise
detachable radiator panels are used. Various other painting methods are used to meet specified • Induced Over - Voltage
customer requirements. • No Load
• Full Load
• Impedance Measurements
• Tank’s pressure withstand ability
Quality Assurance
However much a manufacturer of a product talks high LTL Transformers (Pvt) Ltd. is committed to deliver state of Netherlands. Regular internal and external quality audits
about his products, and his manufacturing processes, the art and reliable products to its customers. To achieve ensure the full and continuous conformity with these
unless the products are tested and certified by this the overseas trained engineers and technicians of international standards. The company’s materials and
internationally reputed independent third party the production facility strictly follow Quality Assurance components suppliers are also required to satisfy these
laborataries or testing agencies, they will not be accepted procedures incorporated in the integrated management quality standards.
by modern markets.The products of LTL have the world’s system at every stage of the production process. The
best thrid party certification. Company is stringently conforming to ISO standards ISO Transformers manufactured at LTL are strictly in compliance
9001:2008, ISO 14001:2004 and OHSAS 18001:2007 with the relevant international standards (IEC, BS, ANSI).
Type-test certification for quality of LTL distribution with regard to these aspects which are certified by the This together with the Quality Assurance procedures result
transformers are received from KEMA High Power & High International Agency Det Norske Veritas (DNV) of the in the highest quality of the products manufactured.
Voltage Laboratories in the Netherlands.
Quality Products Delivered on Time
The quality of each product is guaranteed before its Transportation options and customer requirments
release for dispatch. are carefully evaluated and determined by our well
experienced staff in the field, and the products are
We have experience in securely delivering transformers to appropriately packed and delivered to the final destination.
over 25 countries throughout the world during the past
ten years. Installation of the transformers or substations can either
be done by the customer or by the experienced LTL field
service crew.
Our Dedicated Staff
LTL considers its human resource as its main asset and organizational capacity, which reflects in the quality and
over the years has assembled a well educated, well trained, quantity of its production.
and well contented engineers, technicians and other staff.
UNITED KINGDIM Manufacture of such a range of diversified products that
Their innovation and creativity is well encouraged adhered to international standards would not have been
TAJIKISTAN throughout the organization and appropriately rewarded possible if not for this committed human resource team.
PALESTINE Iraq as novel ideas could arise from various backgrounds.
Jordan
KUWAIT With this shared vision, the company has maximized its
UAE BANGLADESH
INDIA
SUDAN
GHANA
KENYA MALDIVES
SEYCHELLES
MAURITIUS
MADAGASCAR
AUSTRALIA
Technical Data of
Three Phase Transformers
Rated Primary Voltage: 33 kV Rated Primary Voltage: 33 kV (OFF LOAD TAP CHANGER
Secondary Voltage: 415/240 V Secondary Voltage: 11 kV (3 MVA - 5MVA) HERMETICALLY SEALED)
1 Capacity (kVA) 100 160 250 400 630 800 1000 1250 1500 1750 2000 2500 3000 5000
Efficiency
2 97.05 97.65 98.06 98.41 98.54 98.45 98.54 98.59 98.72 98.67 98.79 98.70 98.74 98.88
P.F. = 0.8, Full Load (%)
Voltage regulation
3 4.10 3.72 3.72 3.51 3.84 4.08 4.31 4.75 4.44 5.00 4.86 5.27 5.30 5.53
P.F. = 0.8, Full Load (%)
Support Services of
4 No load loss (W) 355 500 670 965 1295 1400 1550 1825 2160 2290 2620 2830 5195 5275
5 Load loss (W) 2125 2575 3295 4205 6150 8675 10275 12430 13340 16520 17040 23450 25470 40130
LTL Transformers (Pvt) Ltd. 6
7
Total losses (W)
Impedance voltage (%)
2480
4.5
3075
4.5
3965
4.5
5170
4.5
7445
5.0
10075
5.0
11825
5.5
14255
6.5
15500
6.5
18810
7.0
19660
7.0
26280
7.5
30665
7.5
45405
7.5
8 Noise level (dB) 50 51 52 54 55 55 55 56 56 57 58 58 59 60
The company offers a range of support services Length 1095 1165 1285 1370 1535 1890 2010 2025 1985 2250 2420 2510 2900 3250
9
associated with power installations inclusive of Dimensions
Width 900 935 955 1010 1065 1145 1270 1265 1355 1360 1510 1675 1700 1950
(mm)
transformers which consist of Height 1470 1515 1625 1705 1845 1925 1990 2230 2270 2270 2330 2380 2600 2900
10 Oil qty (Litres) 240 300 380 495 695 785 890 1380 1645 1730 1875 2375 2445 3525
• Transportation, Installation, Commissioning and 11 Weight (kg) 850 1050 1400 1850 2500 2850 3350 4315 5065 5420 6045 7610 8850 12500
Testing of Power Transformers up to 220 kVA/150
MVA at Power Plants, Grid Substations, etc, together Rated Primary Voltage: 11 kV (OFF LOAD TAP CHANGER
with associated protection and fire fighting systems Secondary Voltage: 415/240 V HERMETICALLY SEALED)
1 Capacity (kVA) 100 160 250 400 630 800 1000 1250 1500 1750 2000 2500
• Oil filtration and oil testing in transformers up to
Efficiency
2 97.00 97.80 98.01 98.27 98.45 98.47 98.48 98.62 98.70 98.72 98.69 98.66
150 MVA P.F. = 0.8, Full Load (%)
Voltage regulation
3 3.84 3.52 3.39 3.44 3.61 4.09 3.74 4.32 4.34 4.32 5.07 4.85
• Maintenance of Power Installations in Industrial P.F. = 0.8, Full Load (%)
and Commercial Buildings , Power Utilities, Hospital 4 No load loss (W) 270 375 515 720 990 1205 1325 1635 1940 2460 2500 2550
Complexes and other such institutions under Annual 5 Load loss (W) 2250 2510 3550 4925 6950 8740 11010 12375 13480 15740 18885 24710
Maintenance Contract or other terms as required by 6 Total losses (W) 2520 2885 4065 5645 7940 9945 12335 14010 15420 18200 21200 27260
customers 7 Impedance voltage (%) 4.0 4.0 4.0 4.0 4.5 5.0 5.0 5.5 6.0 6.0 7.0 7.0
8 Noise level (dB) 48 49 50 52 53 54 54 56 57 57 57 57
• Repairs of Distribution Transformers Length 955 1015 1130 1245 1490 1890 2010 2025 2135 2340 2390 2425
9
Dimensions
Width 840 880 950 1060 1100 1145 1270 1265 1330 1515 1630 1640
(mm)
• Hiring of transformers for emergency short term Height 1235 1280 1370 1460 1660 1770 1835 2055 2095 2135 2155 2245
requirements as substitutes 10 Oil qty (Litres) 165 200 250 350 540 805 920 1370 1485 1650 1805 2190
11 Weight (kg) 650 850 1100 1550 2100 2750 3200 4225 4730 5420 6060 7160
• Branch offices or agents of company located in Note : Tolerances are applicable as per the Standard IEC 60076
several countries will readily respond to customers’
enquiries with regard to such services Vector Group Dyn11
Temp. Rise (°C) Windings 60
Top Oil 55LTL HOLDINGS (Pvt) Ltd.
67, Park Street, Colombo 02, Sri Lanka | Tel: +94 (0) 112 695 007 | Fax: +94 (0) 112 684 900
Email: info@ltl.lk | Web: www.ltl.lk
LTL TRANSFORMERS (Pvt) Ltd.
154/11, Railway Station Road, Angulana, Moratuwa, Sri Lanka
Tel: +94 (0) 112 605 101-3 Fax: +94 (0) 112 607 312 Email: transformer@ltl.lk
LTL Transformers (Pvt) Ltd.
A Subsidiary of LTL Holdings (Pvt) Ltd.You can also read
