Minimum Energy Performance Standards for Distribution Transformers (MEPS)

• have 2 windings and
• have a rated power equal to or higher than 5 kVA but equal to or lower than 3150 kVA and
• have a highest voltage for equipment higher than 1,1 kV, but not exceeding 36 kV and
• are used or to be used in electricity networks or for industrial applications

Distribution power transformers regardless of when they were first placed on the market or put into service, shall be reassessed for conformity and comply with this Regulation if they are subject to replacement operations both of the core (or part thereof) and one (or more) of the complete windings.

This regulation does not apply to

• instrument transformers, specifically designed to transmit an information signal to measuring instruments, meters, relays and other similar apparatus, or
• transformers with low-voltage windings specifically designed for use with rectifiers to provide a DC supply, or
• transformers specifically designed to be directly connected to a furnace, or
• transformers specifically designed for offshore applications and floating offshore applications, or
• transformers specially designed for emergency installations, or
• transformers and autotransformers specifically designed for railway feeding systems, or
• earthing or grounding transformers, this is, three-phase transformers intended to provide a neutral point for system grounding purposes, or
• traction transformers mounted on rolling stock, this is, transformers connected to an AC or DC contact line, directly or through a converter, used in fixed installations of railway applications, or
• starting transformers, specifically designed for starting three-phase induction motors so as to eliminate supply voltage dips, or
• testing transformers, specifically designed to be used in a circuit to produce a specific voltage or current for the purpose of testing electrical equipment, or
• welding transformers, specifically designed for use in arc welding equipment or resistance welding equipment, or
• transformers specifically designed for explosion-proof and underground mining applications, or
• transformers specifically designed for deep water (submerged) applications, or
• medium voltage (MV) to medium voltage (MV) interface transformers up to 5 MVA.