Transformers
How to Select a Dry-Type Transformer: A Practical Engineering Guide
A practical guide to sizing and specifying dry-type transformers: load, voltage, insulation, cooling, enclosure, harmonics and installation.
· 8 min readBlog & buying guides
Engineering guides for buyers of power equipment
Specification checklists, standards comparisons, sizing methods and testing guides written by the Millenium design and test team — for EPC engineers, utilities, developers and procurement managers.
Articles
Buying Guides
Transformer Factory Acceptance Testing (FAT): Routine Tests, Type Tests and How to Witness Them
Guide to IEC 60076 transformer FAT: routine and type tests, acceptance tolerances, documentation, and how to arrange witness testing.
· 9 min read
Switchgear
Ring Main Unit vs Metal-Clad Switchgear (KYN28): Choosing MV Switchgear for a Distribution Substation
Compare RMUs and metal-clad KYN28 switchgear on IEC 62271-200 classes, fault levels, extensibility, protection and cost.
· 9 min read
Substations
Compact Substations: European vs American Style, and When Each Fits
Compares European three-compartment compact substations with American pad-mounted transformers on footprint, cost, maintenance and application fit.
· 8 min read
Transformers
IEC vs ANSI/IEEE Transformers: What Changes When You Buy for a 60 Hz Market
Key differences between IEC and ANSI/IEEE transformer standards for 60 Hz markets: voltages, BIL, temperature rise, bushings, testing and UL listing.
· 8 min read
Energy Storage
Liquid-Cooled vs Air-Cooled Energy Storage: Which Thermal Management Fits Your Project
Compare liquid-cooled and air-cooled BESS cabinets on temperature uniformity, cycle life, footprint, noise, maintenance and cost.
· 8 min read
Buying Guides
Transformer Specification Checklist: What to Send a Manufacturer for an Accurate Quote
A copy-able checklist of the electrical, mechanical and documentation data a transformer manufacturer needs to issue an accurate, comparable quotation.
· 8 min read
Energy Storage
Sizing a Battery Energy Storage System for Commercial Peak Shaving
How to size BESS power (kW) and energy (kWh) for peak shaving, with C-rate, DoD, efficiency and a worked 300 kW example.
· 8 min read
Transformers
Oil-Immersed vs Dry-Type Transformers: How to Choose for Your Site
Compare oil-immersed and cast-resin dry-type transformers on losses, fire safety, cost, maintenance, overload and environment to pick the right type.
· 7 min readSubscribe to the RSS feed or the product-updates list in the footer to receive new guides.