Transweld Transformer
Design

Transweld’s designs are carefully manufactured to meet the strict requirements of the current standards. The company's guiding factor is to insure long-term low-maintenance service through superior care in manufacturing and production process. Our product is designed according to individual factors such as voltage, power, climate, and several other factors that satisfy the requirements of each quality test at every step.

Core

Transweld Nepal uses low loss Cold Rolled Grain Oriented (CRGO) magnetic silicon steel sheets from internationally reputed brands. CNC cut-to-size annealed cores with precise dimensions, burr-free edge for core integrity that increase the transformer's reliability. The cores are carefully assembled in Nepal by our highly skilled engineers and technicians. The assembled cores are tested for pre-no-load losses before the core-coil assembly process.

AMORPHOUS CORE

Amorphous core significantly reduces core losses which is about 65-75%.

Transweld Nepal has started manufacturing Amorphous metal core type distribution transformers alongside the conventional silicon steel core type distribution transformers.

Amorphous metal exhibits a unique random molecular structure unlike the rigid grain structure of the silicon steel. This allows for easy magnetization & demagnetization which reduces hysteresis loss. Further processing of amorphous metal to a very thin lamination – approximately 1/10th of silicon steel lamination thickness – enables significant reduction in eddy current losses.

Advantages of Amorphous Metal Transformers over Transformers with CRGO Silicon Steel:
  • The thickness of Amorphous Metal is 0.025mm vs. CRGO silicon sheet steel thickness of 0.23-0.3 mm. The lesser the thickness in sheets result in lower eddy current loss.
  • Random molecular structure of amorphous metal causes less friction than CRGO when a magnetic field is applied. This allows easy magnetization and demagnetization, significantly lowering hysteresis losses. Hence, Amorphous core significantly reduces core losses by about 65-75%
  • Saves energy and reduces greenhouse gases and other pollution
  • Excellent option to reduce distribution losses and improve efficiency
  • Superior electrical performance under harmonic condition. Possible to improve power quality and mitigate harmonics
  • Lower temperature rise, slower deterioration of insulations, and longer lifespan
  • Increase in use of power electronics has resulted in considerable amount of higher harmonics distortion in electrical power system. Higher frequency harmonics lead to increase in transformer core losses whereas amorphous alloy provides lower loss under high frequency
  • Easy for repair and replacement of coil
WINDING

At Transweld Nepal, we use round enameled copper wire and triple paper covered rectangular copper strips to make HV / LV coils as required by the design. State-of-the-art HV and LV winding machines are used to wound coils. Special care is taken to not damage insulation of wires while wounding the coils.

DRYING & TRANSFORMER OIL FILLING

The core-coil assembly is placed in an oven to improve insulation resistance and remove accumulated moisture. The dried core-coil assembly is tanked and filled with high quality, clean, dry, and certified oil. (IEC 296 standard).

TANK FABRICATION & PAINTING

The tanks are fabricated from mild steel electrically welded suitable bracing and stiffeners are provided for robust construction. Enough cooling radiators made from corrugated fins are provided to maintain the temperature rise within specified limits. The inside walls are painted with primer and varnished while the outer surface is painted with epoxy-based zinc chromate primer and coated with enamel paint of dark grey shade. All tanks are pressure tested before leaving the fabrication shop in the assembly line.

TRANSFORMERS OIL

Transweld Nepal uses mineral oil made as per the BS 148:1984 IEC: 296 standards. The transformer oil is clean, high quality, and free from moisture.

TAP CHANGER

An off-circuit 7 position tap changer is incorporated in the transformer to provide a constant output voltage to avoid fluctuation. On Load Tap Changer (OLTC) can be provided upon customer requirement.

ACCESSORIES
  • HT & LT bushing
  • Tap changer & drain valve
  • Dehydrating breather
  • Thermometer pocket
  • Oil level indicator
  • Lifting lugs & Earth terminal
  • Name Plate
  • Bi-direction wheels
Testing & quality Control

Every Transweld distribution transformer is manufactured under strict supervision as per ISO 9001:2008 quality management system. Such process starts with rigorous inspection of every inbound raw material till the final product stage by our highly trained personnel. Every single Transweld transformer goes through the following measurements and tests prior to delivery which is also known as our routine tests.

After Sales Services

Transweld Nepal provides unmatched after-sales services including lifetime repair and maintenance benefit for our products carried out by highly skilled technicians. We offer our customers 100% quality satisfaction guaranteed with 2-year replacement warranty. Our service technicians visit the customer installation site annually to do a routine check on the performance of the transformers. This service continues even after the warranty period. On call service is also provided.

Certificate of Compliance

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