Industry Specific Transformers

TH Series Transformer, Sellafield Specification

Type Ref: TH/1/5/240-110/NE/SELLAFIELD

5kVA icon 1 phase icon

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TH series transformer, 5 kVA, single-phase, 240:110NE to Sellafield Sites Engineering Standard ES_1_2223_2

Blakley Electrics step-down, double-wound enclosed transformer manufactured generally in accordance with Sellafield Ltd Engineering Specification ES_1_2223_2 and BS EN 61558 Parts 1 and 4 but with an earthed secondary winding, providing a 110V LV supply.

Due to the temperature rise within the main enclosure, a separate, vented chamber is fitted to the front of the enclosure to house the fusegear and primary isolator. There is an air gap between the main enclosure and the chamber to reduce heat transfer.

Enclosure
The enclosure is of robust construction, vented to IP31 and is fabricated from 1.5mm mild steel, seam welded. The enclosure incorporates: wall and floor mounting brackets; 2 x 20mm and 2 x 25mm knock-outs on each side; mesh fitted behind all ventilation louvres to maintain the IP rating. The enclosure is finished in electrostatically applied polyester powder paint, shade Dark Admiralty Grey to BS4800 18B25.

Incoming Terminals
DIN rail mounted, screw clamp type, shrouded to IP2X.

Primary Isolator
Fitted with a 32A DP panel mounted switch with an external actuator, padlockable in the “OFF” position. The switch terminals are shrouded to IP2X.

Rating
5kVA single-phase, continuously rated, manufactured in accordance with BS EN 61558 parts 1 and 2-4. The winding is constructed from Class “F” insulation materials and incorporates a protective screen between the primary and secondary windings.

The transformer is of low inrush design which is ≤5 times the full load current rating of the transformer during the first cycle following energisation (based on the supply being connected to the correct primary voltage tapping and the source impedance of the primary supply being ≥0.1Ω.

Primary Volts
240 volts with tappings at 220, 230, 250 and 260V.

Secondary Volts
110 volts neutral earthed (this is not a Reduced Low Voltage supply and should not be used to supply portable power tools or temporary lighting on UK construction sites).

Distribution
1 no. RS63H black fuse carrier equipped with a 63A HRC fuse link feeding the Live load terminal within the main enclosure.
2 no. RS63H white fuse carriers each equipped with a solid link. One white carrier supplies the outgoing neutral terminal and the other is connected to the main earth stud, both located within the main enclosure.

A wiring diagram is supplied with each transformer.

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Data Sheets

Drawings

On Application

This product cannot currently be purchased online. Please contact Blakley Electrics Customer Services on 0333 188 0284 to discuss your requirements and for pricing and lead times.