Understand, specify and operate a transformer.

A technical library for installers, engineering teams and project managers. Each guide addresses a real decision with European references and clear, practical language.

40 guides in English4 technical pathsIEC · NF · MV/LV

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Understand & choose

Technologies, components and key trade-offs before defining a solution.

Oil-immersed and dry-type transformers presented side by side

Reference guide · equipment choice

Oil-immersed or dry-type: which should you choose?

Cost, fire safety, location and operation: a clear comparison based on the real project.

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How a transformer works Transformer types The compact prefabricated substation Step-up or step-down? Vector groups & clock index (Dyn11…) Core and windings What do bushings do? Mineral oil or ester? Cooling modes: ONAN, ONAF… Transformer room ventilation

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Size & specify

Turn an electrical requirement into a usable and comparable specification.

Distribution transformer against a restrained engineering drawing background

Reference guide · specification

Specifying a distribution transformer

Voltages, rating, losses, vector group, accessories and tests: the specification, field by field.

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Transformer price: what moves the quotation Sizing right: the kVA guide kVA, kW and power factor K-factor and harmonics Choosing the right transformer Copper or aluminium windings?

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Compliance & quality

Standards, documentary responsibilities and evidence to secure before shipment.

Dry-type transformer and electrical test equipment in a laboratory atmosphere

Reference guide · EU compliance

Tier 2 explained: Regulation 548/2014

European loss requirements and the documents used to verify them before shipment.

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NF C 13-100: the delivery substation explained Transformer lead times in Europe CE marking of an imported transformer SF6-free MV switchgear: what the F-gas Regulation changes for your substation Buying a transformer made far away, safely IEC 60076 vs IEEE / ANSI C57 WEEE for transformers Testing & quality control Factory tests (FAT) & witness testing

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Install & operate

Grid connection, installation, reliability and life-cycle decisions.

Prefabricated MV LV substation and distribution transformer

Reference guide · project coordination

Connecting to the French MV grid: the process

DSO milestones, substation interfaces and the decisions that must be made early enough to protect the schedule.

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Transformer noise: measure and reduce Replacing a transformer Common failures (and how to avoid them) Overheating or tripping in summer A transformer getting louder Should you replace your old transformer? Installation best practices HV substations above 50 kV (RTE) Transformers in public buildings & hospitals Data center transformers Solar plant transformers

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