Voltamp Power transformers has been in the forefront of innovation and development since 2011 in Oman and widened its installed base in MENA region, Voltamp’s strong fundamentals in Design & Technology supported by it advanced manufacturing facility & Skilled People with a committed focus on customer delight has been the key to success. We manufacture transformers upto 500 MVA, 220 kV class transformers and the facility is designed and capable of manufacturing Extra high voltage transformers upto 500 MVA & 400kV range, the facility is located in Phase V, Sohar Industrial Area, which is well connected by Sohar Sea port and International Highway for catering to customer prompt needs.
The facility is currently being upgraded to manufacture Power Transformers up to 400kV Class, a unique feat in the MENA region. The factory is built to the latest global standards, in technical collaboration with Tatung Company of Taiwan. Tatung is a respected and diversified business company, is a leader in several technologies including digital consumer products like LCD TVs and industrial products like cables, gas insulated switchgear, motors and transformers. Their products are exported all over the world including Japan, USA and Australia. Tatung has been making transformers for over 45 years and their transformers are known for their quality, reliability, as well as for rugged construction. Currently their transformer range extends up to 1000 MVA, 500 kV class.
CUTTING EDGE DESIGN
Voltamp Power SAOC uses powerful and highly sophisticated software tools to design and develop the power transformers. These tools help in ensuring optimum electrical & mechanical efficiency and determine eddy current losses & short circuit forces accurately. 3-D modelling software enables to view virtual prototypes of transformer including active part and electrical clearances. This software programme helps in detailed analysis of design and consistent results to calculate:
- Oil flow & temperature rise
- Leakage flux distribution, eddy current losses and short circuit electro-magnetic forces
- Impulse voltage distribution
- Mechanical strength of tank
- Voltage stress analysis
- Software for core designing, etc.
WINDINGS
The factory is equipped with 12 Windings machines of Vertical and Horizontal type with capacity of winding high upto 3000 mm height, the windings are manufactured in a clean, dust free and air-conditioned environment to ensure the integrity and quality of the product.
High voltage windings are generally disc type which has better short circuit withstand capability, uniform surge voltage distribution and effective heat dissipation. Continuously transposed conductor is extensively used for making the windings to achieve low eddy loss. The windings are produced on PLC controlled machines to meet the exact dimensions. Adjustable mandrels ensure compliance to designed winding diameters. All Windings are individually as well as in assembled are processed with heating cycles to ensure the insulation is of highest quality.
CORE
Hi-B Grade Cold Rolled Grain Oriented (CRGO) silicon steel laminations are used as core material with step lap core construction and without core bolts which ensures low no-load loss, less noise and low exciting current.
The limb and yoke is bound by non-conducting resin glass tape which provides rigidity to the core and uniform circularity for inner most winding. The core is clamped with rigid construction of core frames with solid insulation to ensure the integrity and quality of core assembly.
CORE COIL ASSEMBLY
Core and windings are assembled in the main assembly area. Extra care is taken for connections of winding leads, using proper terminal gears to tap changer and leads. Trained personnel make the appropriate brazing or crimping connections.
DRYING PROCESS
Drying process is the key for the longitivity of the transformer and we as VOLTAMPERS understand the significance of the same and due care is given at every stages of drying process by ensuring the process is properly maintained and monitored. The drying process is completely automatic with PLC based systems which ensure every cycle of temperature and Vacuum are 100% achieved.
TANK & TANKING
Tanks are fabricated from the best quality mild steel sheets by qualified welders by TIG/MIG & Arc welding processes based on the type of joint. Finite element analysis software is used to obtain optimum tank construction and appropriate reinforcement to ensures the tanks are capable of withstanding different mechanical stresses such as external pressure during vacuum oil filling, vibration during transportation, gravity in lifting and oil & internal pressure caused by temperature rise.
Tanking of Core coil assembly in the tank is done by team of experts who ensures the clearances, alignment and integrity of the transformer is maintained to the highest level of Quality, safety, reliability & identification.
TESTING
We are equipped with ‘state-of-the-art’ high voltage testing laboratory which is accredited by IAS – USA as per ISO/IEC 17025-2005 for testing laboratory TL-640, which is again one of its kind in the region
100% transformers are tested in the factory before it is cleared for dispatch, the test facility is well equipped to perform all routine, type and special tests in accordance with IEC 60076/ANSI(C-57-12-90) to ensure very high standards of quality.
- Lightening & Switching impulse test
- Induced over-voltage test (ACSD and ACLD with PD measurements)
- Power frequency withstand voltage test
- Temperature rise test
- Measurement of noise level
- Measurement of harmonics and zero sequence impedance
- Capacitance and tan delta measurement;
- SFRA (Sweep Frequency Response Analysis)
- And any specific customer requirements.
This testing facility is equipped to carry out all tests for transformers up to 500MVA 220kV Class. Our products are type tested at KEMA Laboratories – Netherlands for Short Circuit withstand capabilities.
QUALITY CONTROL
Voltamp Power transformers is a ISO 9001, ISO 14001 and OHSAS 18001 certified company with a strong and robust management system which is 100% compliance to the requirement. The products are made under stringent quality control which covers all the stages of manufacturing, design, selection of vendors, sourcing of raw materials, inspection on receipt of raw materials, measurement and tests after each manufacturing stage and a final acceptance test in the presence of customers or their nominated representative
IN-HOUSE HANDLING AND TRANSPORTATION
The entire power transformer facility is epoxy floored. Air cushion system are used to move the windings, sub-assemblies and complete transformers, facilitating a smooth and free movement inside the plant which is essential for the safety and long life of transformers. We have overhead cranes in all areas from 5 Tons to 175 Tons supported with Fork lifts, pallet trucks etc for ease and safe movement of material.
Transformers are dispatched to site or Voltamp suggests to customer to use of hydraulic axles trailers for transformers weighing beyond 60 tons and use of impact recorders to measure shocks during transit.
INSTALLATION AND AFTER SALES SUPPORT
Voltamp Power has a dedicated team of engineers and workmen to provide service during installation and commissioning. The Company is committed to attend any calls within 24 hours. Voltamp Power is also planning to keep standby standard power transformer units at its facility so that they can be mobilized to site within 24 hours of requirement. Voltamp Power is also keen to set up a dedicated team to ensure timely and efficient repair of other makes of transformers at its facility.
