The GT derives power from the generator terminals and delivers it to the EHV buses. On interruption of supply to various buses, Changeover from one supply to other is resorted using Tie Buses. Station Bus:Īll the auxiliaries which are common to the station are connected to station buses. Unit Bus:Īll the auxiliaries which are required to run for the successful operation of the unit, are connected to unit buses 2. Single Line Diagram of Power Plant- Equipment Description: 1. NC-Normally Closed Status of Circuit Breaker.NO-Normally Open Status of Circuit Breaker.Here is given an example of a typical LT panel one line diagram or Single line diagram (try to follow it as best as possible). Earthing system must be included with dimension of earthing pit, boring, earth electrode size,Įarth lead and ECC cable size and type.All outgoing cables with cable size and type with rating and type of their associated isolating.Critical equipment voltage and size (UPS, battery, generator, power distribution, transfer.All substations, including integral relays and main panels with total load of each feeder and.WHAT SHOULD BE IN A SINGLE LINE DIAGRAM (SLD)? A typical package of single line diagram shall include: An up-to-date single-line diagram is vital for a variety of service activities including: To make all the changes documented in a common file, making the electrical system easily understandable for any technical person inside/outside of the factory. It needs to change as your facility changes to ensure that your systems are adequately protected. As such, the single-line diagram is like a balance sheet for your facility and provides a snapshot of your facility at a moment in time. WHY IT’S REQUIRED? Whether you have a new or existing facility, the single-line diagram is the vital roadmap for all future testing, service and maintenance activities. It is the first step in preparing a critical response plan, allowing you to become thoroughly familiar with the electrical distribution system layout and design in your facility. SINGLE LINE DIAGRAM (SLD) Or, ONE LINE DIAGRAM The single-line diagram is the blueprint for electrical system analysis. Earthing system must be included with dimension of earthing pit, boring, earth electrode size, earth lead and ECC cable size and type.All spare switches (outgoing circuit breaker) shall be mentioned.All connected load with their individual load capacity.All earthing cable rating (size, type etc.).Rating of PFI, changeover, ATS, generators with associated protection and isolating switch.Length and voltage drop of all outgoing cables.All outgoing cables with cable size and type with rating and type of their associated isolating switches (e.g.A load schedule for each distribution panels and switch board.A summary load schedule for the LT switchgear panel.Critical equipment voltage and size (UPS, battery, generator, power distribution, transfer switch, computer room air conditioning).All substations, including integral relays and main panels with total load of each feeder and each substation.All main cable and wire runs with their associated isolating switches.Current and / or potential transformers with size, type and ratio. Feeder breakers and fused switches rating and type.Power transformers (rating, winding connection and grounding means).Incoming main fuses, cutouts, switches, and main/tie breakers.Incoming lines showing voltage and size.Efficient maintenance WHAT SHOULD BE IN A SINGLE LINE DIAGRAM (SLD)? A typical package of single line diagram shall include:.
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