Breaker integrated transformers (BIT)

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Breaker integrated transformers (BIT) couple a traditionally separate Molded Case Circuit Breaker (MCCB) and a low-voltage dry-type distribution transformer. This solution helps reduce arc-flash hazard, footprint and overall cost of the electrical distribution system. Arc-flash hazard: Transformers are no longer excluded from IEEE 1584, the standard used to calculate arc-flash hazard arcing current, incident energy and arc-flash boundaries. Erik Hurd, Senior Power Systems Experience Center Engineer, explains how relocating the secondary main breaker to the transformer allows for reduction of incident energy at the secondary panelboard. Erik also describes how this affects calories per centimeters squared (cal/cm2), the number that quantifies the arc flash heat energy found at the worker’s body and personal protective equipment (PPE) requirements. Footprint and cost reduction: Breaker integrated transformers reduce the space required by 30% compared to traditional three-component power system: separate breaker, transformer and loadcenter. Simultaneously, Eaton’s BIT also satisfies NEC article 240.4(F) and 240.21(C), allowing for the BIT to be placed outside the 10-foot limit creating greater design flexibility. The reduced footprint also contributes to reducing installation time by 18%. Design and standards: Eaton’s Transformer Flex Center can build BIT that meet • DOE 2016 (Technically known as CFR Title 10, Chapter II, Part 431 (in Appendix A of Subpart K 2016): U.S. Department of Energy (DOE) energy efficiency requirements for distribution transformers. • NEC 240.6: Restricted access adjustable-trip circuit breakers, for configurations with Eaton’s Power Defense breakers. • NEC 450.10(A) For grounding dry-type transformer enclosures, a terminal bar for all grounding and bonding conductor connections should be secured inside the transformer enclosure, and not installed on or over any vented portion of the enclosure. Erik also lists the many design options that the Transformer Flex Center can provide in building custom solutions. Visit Eaton’s Transformer Flex Center site: https://www.eaton.com/us/en-us/products/low-voltage-power-distribution-control-systems/transformers/transformer-flex-center.html Thank you for watching one of our many educational videos on the topic of power systems. Schedule a visit to one of Eaton's Power Systems Experience Centers in either Pittsburgh or Houston to learn more! To learn more about Eaton products and our Power Systems Experience Centers: http://eaton.com/experience To view more educational videos from Eaton's Power Systems Experience Centers: http://videos.eaton.com/experience Chapters 00:00 00:11 Intro 02:02 What is a BIT? 02:31 Why use a BIT? 03:29 Cost/installation reduction 04:03 BIT configurations 05:43 Transformer Flex Center #powertransformer #powersystem #engineering