SINTRA

Design

The remarkable design characteristics of SINTRA’s transformers ensure that they can perform under the most demanding of conditions.

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SINTRA's design advantages include the following:

High mechanical strength
High short-circuit withstand capability
Low partial discharge
Low noise level
Low loss
Low temperature rise
No leakage

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The design team at SINTRA employs a variety of advanced design software and simulation tools to engineer the most reliable and high-performance transformers.

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Stress and deformation analysis at vacuum pressure

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Temperature simulation of radiators and fans using Computational Fluid Dynamics (CFD)

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Study of von Mises stress using Finite Element Analysis (FEA)

Core and Windings

Continuously transposed conductors (CTC) are used for both primary and secondary windings. The advantages of CTC include high mechanical strength, high short-circuit withstand capability, and low loss. Net-wrapped CTCs are also used for more effective heat dissipation and economical sizing of the overall transformer.

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Grain-oriented electric steel (GOES) sheets up to grade 0.75 are stacked using step-lap joint method to create a smooth magnetic flux path. This allows the stacked core to exhibit exceptional properties like low iron loss, low excitation current, and high mechanical strength.

Assembly and Drying

All assembly procedures are done in a dust-free, safe, and comfortable working environment.

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Remarkably, SINTRA uses Vapor Phase Drying (VPD) technology for effective moisture removal from transformer insulation material. This process guarantees high insulation strength of the active part.

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Before oil injection, the tank is also vacuumed to safeguard the active part and all insulation materials are optimally oil-impregnated. Meticulous handling at every production stage is critical in guaranteeing that the products operate at only tens of pico-Coulombs of partial discharge.

Testing

SINTRA’s testing system is one of the best for electrical products operating up to 150kV.

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Our state-of-the-art testing facility houses a variety of advanced testing equipment and software that can complete a variety of test items to high precision and accuracy.

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These test items include, but are not limited to, the following:

Measurement of no-load loss and no-load current
Lightning impulse test
Line terminal AC withstand test
Induced voltage test with partial discharge measurement
Temperature rise test
Functional test on control equipment and accessories
Zero sequence impedance measurement
Measurement of frequency response (SFRA)

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Since establishment, SINTRA has manufactured, tested, and delivered numerous power transformers designed according to the strict standards of PT. PLN (Persero), Indonesia’s state-owned electric company.

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The SPLN standards are shown for reference:

SPLN T3.007:2016/2017

Power Transformers

SINTRA specializes in power transformers up to 150MVA and 150kV.

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