Bespoke Industrial Transformers

TXL Series From 30kVA to 250kVA



Can’t find what you’re looking for?

We’re always here to help! Give us a call or fill out our contact form and a member of our team will be in touch!

TXL series transformer assemblies are made to order, in ratings from 30kVA to 250kVA in voltages of up to 3300V. Transformer windings are housed in heavy duty enclosures and can incorporate a range of switchgear and fuse gear. If you would like to discuss a bespoke transformer, please click on the Enquire button, forward your details and we will contact you to discuss your requirements.

TXL series, 30kVA to 250kVA A range of made to order transformer assemblies rated from 30kVA to 250kVA with voltages of up to 500V. Higher voltages can be accommodated (up to 3300V), subject to the specification of the overall assembly. Transformers can be step-down, step-up or have a 1:1 ratio. They can be single or three phase, double or auto wound. They are usually presented in heavy duty enclosures fabricated from mild steel or stainless steel.

Applications include:
– IT supplies for merchant and military ships;
– signalling supplies in the rail sector (see data sheet TRDS032 for details of Network Rail approved transformers);
– LV supplies within National Grid HOT sites;
– isolated supplies for construction sites to ensure separation between temporary and permanent supplies;
– step-up and step-down pairs for tunnel and trackside applications;
– permanent or temporary LV / RLV supplies within large industrial complexes such as dockyards and offshore fabrication yards.

Transformer cores are manufactured in accordance with relevant sections of BS EN 61558 or BS EN 60076, in virtually any rating from 30kVA to 250kVA, single or three phase. For most applications transformers are double wound but auto wound transformers can be incorporated when the voltage is being transformed for purely functional purposes. Transformer assemblies are naturally air cooled and continuously rated at an ambient of 25°C (higher ambient temperatures can be catered for if advised at the time of enquiry). For critical installations, thermocouples can be embedded into the windings to enable the temperature to be monitored whilst in use. As our equipment is typically used in harsh operating conditions, windings are vacuum varnish impregnated and tropicalised as standard.

Primary and secondary winding voltages are to be specified at the time of enquiry. We are generally able to accommodate voltages up to 3300V, although incorporating switchgear at this voltage is not usually practical.

BS7671:2018 permits a supply voltage tolerance of -6% to +10%. Any variation in the voltage connected to the primary of the transformer will proportionally vary the secondary voltage and also alter the inrush current characteristics. To address the impact of supply voltage variations, voltage tappings can be incorporated into the primary winding. We would be pleased to quote for transformers with primary tappings. Tap changing is usually a manual operation but off-load tap changing switches can be incorporated to facilitate easier switching and access to the tap changing switch is restricted by a padlockable cover.

Specifying the secondary earthing arrangement is critical, as is the relationship between the earthing of the primary and secondary circuits (particularly on 1:1 ratio transformers).

Inrush Current
Transformers typically have an inrush current of 10 to 15 times full load. Please advise at time of enquiry if a low inrush current design is required (and the impedance of the supply).

A range of switchgear can be incorporated including isolators / switch disconnectors, MCBs, MCCBs, Switch Fuses, IMDs and RCD protection, dependent upon the voltage of the windings.

TXL series transformers are offered in a range of five enclosure sizes, as detailed on the table below. Enclosures are floor standing and non-vented to IP55 (IP23 vented enclosures can also be supplied). Enclosures can be fabricated from mild steel with a durable polyester powdercoat finish (Blakley B finish) or from various grades of stainless steel with a painted finish (Blakley L finish). Stainless steel enclosures can be unpainted but this is not generally recommended, unless the aesthetic appearance is not a consideration. External chambers are incorporated to house switchgear, socket outlets or to terminate large or oversized cables. To reduce the risk of condensation forming, IP rated breathers are incorporated within switchgear compartments.

TXL transformers are made to order. If you can advise requirements in the following areas, we will be able to provide a detailed quotation: rating; duty; ambient temperature; single or three phase; auto or double wound; maximum inrush current; voltage ratio; tappings; earthing arrangements; cable terminations; switchgear; sockets; enclosure material (steel or stainless steel); IP rating; shade of paint; space constraints; delivery location.

Product Downloads

Data Sheets


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.

You may also like…