Technical Summary
The article provides a detailed analysis of schematic drawings for a 13.8kV, 100MVA transformer feeder using ABB UNIGEAR-ZS1 switchgear and REF 615 protection relays. It explains the operation of vacuum circuit breakers, current and voltage transformers, and auxiliary systems such as mechanical earthing switches and cooling circuits.
Original Reporting Excerpt
96 Schematics Analysis of 13.8kV 100MVA Transformer Feeder (PDF) WEEKLY DIGEST For advanced LV/MV/HV electrical engineers Power Engineering Analysis (PDF) Schematics Analysis of 13.8kV 100MVA Transformer Feeder This technical article provides a detailed analysis of the schematic drawings for a 13.8kV, 100MVA Transformer Feeder. The source material for this analysis is attached drawing document (PDF), detailing an ABB UNIGEAR-ZS1 metal-clad switchgear panel designated as =H.1. The analysis starts with an overview of the Single Line Diagram (SLD) and physical panel specifications. From there, we will explain the mechanical and electrical operations of the vacuum circuit breaker, tracing the precise pathways of its charging motor, safety interlocks, and redundant trip coils. The discussion will examine the distinct roles of the multi-core Current Transformers (CTs) and Voltage Transformers (VTs), explaining how they feed high-impedance differential schemes, precise metering instruments, and primary feeder protection relays. We will also explain the schematics of digital protection relay ABB REF 615, its binary input matrix, analog mappings, and critical circuit breaker failure (CBF) lockout logic. Furthermore, the analysis will navigate through auxiliary systems, including mechanical earthing switches and load-dependent cooling circuits. A download link to the complete PDF document with drawings (256 pages) is included. Open it up, so you can follow the discussion. Read more & Download (PDF) Wired Articles & Guides Save 50% on courses with the Enterprise Membership! Premium Membership Power Plant Commissioning Blind Spots in Power Plant Commissioning: What You’re Overlooking Power Substation New Substation Technologies You Should Know About Ring Main Unit (RMU) A Practical Guide to the Operation of Ring Main Units Relay Protection Using earth & phase directional protection where power flow direction might change Substation Installation (PDF) Ins
Source: Electrical Engineering Portal
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