SINTRA

Core

The transformer core is composed of high quality cold-rolled grain-oriented silicon steel sheets. SINTRA’s cores boast exceptional properties like low iron loss, low noise, compact size, high mechanical strength, and excellent magnetic characteristics.

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01. Strip-Wound Core

For application of 1-phase or 3-phase compact size transformers with low noise and excellent magnetic circuit characteristics

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02. Stacking Core

A mitered core, joined by 45-degree cut silicon steel sheets, with excellent mechanical strength and low iron loss. For the application of high capacity transformers

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03. Step-Lap Core

For applications of 1-phase or 3-phase core-type or shell-type transformers of high capacity and voltage. This type of core has high mechanical strength and allows for a smooth magnetic flux path to considerably minimize iron loss

Windings

SINTRA windings have compact sizing, excellent heat transmission, low load loss, high lightning impulse resistivity, and exceptional anti-short circuit strength.

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They are composed of high quality round magnetic wire, paper-insulated conductor, and copper or aluminum strips.

Accessories

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01. Insulation

‍Pressboard, thermally upgraded insulating Kraft paper, high breakdown resistance transformer oil

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02. Bushings

‍High quality porcelain bushings with optional bushing wells and plug-in bushings upon request. This option allows cables to be inserted directly, with no live parts outside

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03. Clamp

‍Step-lap cores and stacking cores have different clamping arrangements. Sintra’s core clamps are manufactured in-house to be capable of withstanding strong axial electromagnetic force. This is critical in guaranteeing the safety of the transformer in an abnormal event of overload

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04. Standard Accessories

‍Name plate, rating plate, oil level indicator, oil temperature indicator, fill and drain valves, lifting lugs, tap changer, base roller or skid base

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05. Accessories for Conventional Tank

‍Conservator with breather, Buchholz relay, dial-type thermometer with alarm and tripping contacts, bushings cable box, elastimold epoxy resin bushing for HV side

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06. Accessories for Hermetically-Sealed Tank

‍Pressure relief device, pressure vacuum gauge, nitrogen filling valve, dial thermometer with alarm and tripping contacts, bushings cable box, elastimold bushing

Testing

Quality control is exceptionally important to us. Despite our large production capacity, SINTRA ensures that all products pass routine tests as specified by customers standards.

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Test items include, but are not limited to, the following:

Turn ratio test
Polarity test
Copper loss (load loss) test
Iron loss (no-load loss) test
Transformer oil breakdown voltage test
Measurement of no-load current (exciting current)
Measurement of impedance
Applied voltage test
Induced over-voltage test
Impulse voltage test
Temperature rise test

Arrangement Drawing

Distribution Transformers

SINTRA is a market leader in the design and manufacturing of 1-phase and 3-phase oil-immersed distribution transformers up to 20MVA and 33kV.

More Products & Services

Maintenance and Repair

Load Break Switch

Power Transformers

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