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Medium Voltage Retro-fill: Process, Product, Before and After, Safety, New Technology

This article discusses the process and benefits of retro-filling medium voltage switchgear with ABB's Advac circuit breakers. It covers site verification, custom component design, shipment of materials, installation, and commissioning. The article also emphasizes the importance of operational safety in switchgear design.

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Medium Voltage Retro-fill: Process, Product, Before and After, Safety, New Technology

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  1. Medium Voltage Hard Bus Retro-fill ABB MV Service

  2. Medium Voltage Retro-fill • Process • Product • Before and After • Safety • New Technology • Q and A

  3. Medium Voltage Retro-fill • The Process - Site Verification Visit for Engineering Measurements – An ABB design engineer visits the site to obtain measurements of the existing equipment for the purpose of designing all of the components necessary for the retro-fill (door, barriers, dead front, bus, etc.) in order to incorporate the L-Frame into the existing switchgear cubicle. A one (1) day outage is required for these measurements. - Custom Component Design Engineering and Manufacture – ABB’s design engineer will design any components deemed necessary for an effective and efficient retro-fill. Approval drawings will NOT be generated, but rather we will supply mechanical conceptual drawings, and control diagrams. Some components, such as the copper bus connectors between the L-Frame and the existing switchgear cross bus, may be designed on-site during the retro-fill by the ABB Field Engineer in the performance of the installation. The designed components will be manufactured and either shipped to the site or brought to the site by the Field Engineer. Upon completion a full set of as built drawings will be supplied.

  4. Medium Voltage Retro-fill - Shipment of Standard Materials – Circuit breakers, L-Frames, CT’s, Kirk Key Locks, etc. are shipped to the site, with their arrival verified prior to dispatching ABB Field Engineers to the site to perform the retro-fill. - Demolish Existing Cubicle Contents – ABB’s Field Engineers will remove the old breaker, racking components, and any other unnecessary items from the cubicle, effectively gutting the cubicle for unimpeded access to the cross bus. - Installation of L-Frame – ABB’s Field Engineers will incorporate the L-Frame, CTs, barriers, dead front, new door with indicating lights, breaker control switches, etc., into the existing cubicle, connecting the switchgear bus to the L-Frame’s primaries with appropriately sized and braced copper bus.

  5. Medium Voltage Retro-fill • Installation and Commissioning of the New ABB Advac Circuit Breakers – The new circuit breakers will be racked into the L-Frame and commissioned (verification of safety interlocks operation, verification of open, close, motor charging operation, verification that breakers lever easily into or out of their switchgear compartment cell, testing for vacuum integrity, plus operational and vacuum interrupter technology training for the end user operators.)- Complete outage with LO/TO and grounds per DLCo procedures

  6. Medium Voltage Retro-fill • The Product - The new Breaker and L-Frame will be ABB Advac. - Current production - Spare parts readily available for customer stock - Closed Door racking - Option for remote racking if required - Interchangeability

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  32. Medium Voltage Retro-fill • OPERATIONAL SAFETY The process of racking a circuit breaker into and out of the connected position is one of the most frequent exercises that expose an operator to risk. Increased focus on operator safety has caused owners to question the adequacy of prior switchgear designs that require the cell door to be open in order to connect or disconnect the primary circuit and the secondary control circuit. A malfunction during this operation has the potential for catastrophic consequences to equipment and personnel. Supervised, closed door circuit breaker racking is a fundamental recognized safety practice. Furthermore, older breakers are more complex and vulnerable to mechanical failures that create safety problems.

  33. Installed applications • Westinghouse: • B-22-B • B-28-B • 138-B-250 • B-28-B Vertical • B-22-B Vertical • McGraw Edison • 5-WSA-250 • PSD-5-251 • General Electric • FKR-225 • FK-225 • FK-32-C • FK-32-C • F-100 • FK-143 • AKR-30 (stationary) • Allis Chalmers • DZ-60 • DZ-80 • DZ-100 • Federal Pacific • DMB-75

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