Overview

Dear All,Welcome to the course of understanding schematics of "Transformer Protection Panel Schematics". This course covers complete schematics of 20/26MVA 132/11 kV transformer protection panel. Trainer Introduction:Your trainer brings over 21 years of experience in operation & maintenance, erection, testing, project management, consultancy, supervision, substation automation, SCADA, and commissioning. With a background spanning power plants, high voltage substations, and HVDC installations, he has worked with renowned organizations such as Siemens Saudi Arabia. He has been involved in over 20 high-voltage substation projects across Pakistan and Saudi Arabia.His expertise encompasses a wide range of areas including protection systems, substation automation systems, design, testing, and commissioning of power generation systems, high voltage switchgear, protection relays, and control schemes. He has a proven track record of leading testing and commissioning teams for implementing electrical infrastructure projects for industrial clients, including steel and petrochemical industries.This training is designed over as schematics, that will also be available to download.Topics covered in this training are as follows, Introduction to title pageHow page is divided in rows and columnsHow to track inter panel loopsDrawing Revision No, PhilosophyDrawing approval stages Why two ratings of transformer are mentioned on drawingsUnderstanding Drawing numberHow Bay numbers are assignedHow to define address of object at the pageHow to read list of contentOrdering code , Origin, Make of itemsDetails provided in GA drawings Color coding, wire size, relay types, alarm, annunciation details, why GA drawing are important during design and commissioning stage / Maintenace stageGenerally, control wiring is grey, CT VT wiring RYB, trip ferrule in red color etc.Understand symbols & legendsSymbol of CT, VT, Relays, Aux, push button, Load break switch, power contact of CB, limit switch etcRelay and metering diagram How relays are shown on R & M diagram, all protection schemes, core of CT's, tripping circuit, trip & lockout CT and its coresCT Polarity at primary and secondary sidesProtection and metering coresMetering core circuitProtection core circuitBackup over current protection connections at R & M SLDTransformer bay connection to Breaker failure and protection coresHV & LV vector group, NGR connection, NGR over current, neutral over current at R & M SLDDifference between neutral and NGR over currentRestricted earth fault protection CT connection & its zone at R & M SLDMechanical Protection from transformer at R & M SLDBusbar & earth switch, Voltage transformer arrangement at R & M SLD.Lock Relay 86Tripping Relay 94When to use 86 and where to use 94 relay in scheme.List of ApparatusAC Supply circuit, AC Socket, AC light, AC lighting and heating, annunciationExternal and internal panel drawings symbolsMCB connections, where to connect ODD & EVEN terminals What mean by arrow signs & square shows for MCB symbolAC Loop failure indicationAC annunciator circuitDC Supply CircuitDC supply change over circuitRedundancy of DC supply explained & why it is providedWhat mean of dash dot lines in drawingsHow dc supply change over circuit works if one supply fail.What is loop in drawings and naming of loopUnderstand DC supply supervision & loop supervision, what is difference between themTracking loop across drawings and check till endExplained Current Transformer circuit of Differential protection & over current protection Zone of differential protectionShorting facility of CT circuitWhy CT circuit should be short circuited all the time & must never be open circuitedExplained Test Block, Use of test blockHow to inject current through testerCT connection of REF protectionZone of REF ProtectionWhy lockout contacts are used in parallel to high impedance lockout relayOver voltage protection in REF protectionRelay power supply connectionRelay watch dog contactTest block contact 13-14 for relay powering up.test plug cover when removed relay is powered off.Difference between tripping and lockout relaysHow to reset lockout relays, mechanical & electrical resetBinary input circuit of relaysOperation of lockout relaysCircuit of Tripping and lockout relaysComplete details of contacts of lockout relaysTrip Coil 1 & 2 circuit Breaker Failure initiation Trip circuit supervision relaySupervision relay working when circuit breaker is in open / close positionClose Block feature, why its is required, circuit of close block Alarm and SCADA circuitDevice detail & panel layout.Best Regards

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