Enroll Course: https://www.udemy.com/course/learn-transformer-protection-panel-schematics/
In the realm of electrical engineering, understanding the intricate details of protection panel schematics is paramount for ensuring the safe and efficient operation of power systems. Recently, I delved into the Udemy course ‘Learn Transformer Protection Panel Schematics,’ and I must say, it’s an invaluable resource for anyone involved in substation operations, maintenance, or design.
This course offers a deep dive into the schematics of a 20/26MVA 132/11 kV transformer protection panel. What sets this course apart is the instructor’s extensive experience. With over 21 years in operation & maintenance, testing, project management, and substation automation, including work with Siemens Saudi Arabia and involvement in numerous high-voltage substation projects, the trainer brings a wealth of practical knowledge to the table. Their expertise spans protection systems, substation automation, design, testing, and commissioning of various high-voltage equipment.
The course structure is meticulously designed around schematics, which are also provided as downloadable resources. This hands-on approach allows learners to follow along and gain practical insights. The trainer expertly guides students through understanding the fundamental elements of schematics, such as page division into rows and columns, tracking inter-panel loops, interpreting drawing revision numbers and approval stages, and deciphering the meaning behind dual transformer ratings on drawings.
A significant portion of the course is dedicated to demystifying drawing numbers, bay assignments, and object addresses within the schematics. We learn about the importance of the list of contents, ordering codes, item origins, and the details found in General Arrangement (GA) drawings, including color coding, wire sizes, relay types, and alarm/annunciation details. The trainer emphasizes why GA drawings are crucial during design, commissioning, and maintenance.
The course meticulously explains common color coding and wire sizing conventions, such as grey for control wiring, RYB for CT/VT wiring, and red for trip ferrules. It provides a thorough understanding of symbols and legends, covering CTs, VTs, relays, auxiliary components, push buttons, load break switches, circuit breaker power contacts, and limit switches.
The detailed breakdown of relay and metering diagrams is particularly insightful. The trainer explains how relays are depicted, covers all protection schemes, discusses CT cores, tripping circuits, and the polarity of CTs. The distinction between protection and metering cores, along with their respective circuits, is clearly articulated.
Key protection schemes covered include backup overcurrent protection, transformer bay connections to breaker failure and protection cores, HV/LV vector groups, NGR connections, and neutral/NGR overcurrent protection. The course also delves into restricted earth fault (REF) protection, including CT connections and zones, as well as mechanical protection and voltage transformer arrangements.
Crucial protection relays like Lockout Relay 86 and Tripping Relay 94 are thoroughly explained, including when and where to use each in a scheme. The course also covers AC supply circuits, MCB connections, loop failure indications, annunciator circuits, DC supply circuits, DC supply changeover, and the redundancy of DC supplies. The meaning of dash-dot lines and the working of DC supply changeover circuits during failures are well-explained.
Loops are clearly defined, and the course guides learners on tracking them across drawings. DC supply supervision and loop supervision are differentiated, and the process of tracking loops to their end is demonstrated. Current transformer circuits for differential and overcurrent protection are detailed, including the zone of differential protection and the crucial facility for shorting CT circuits, with explanations on why this must never be left open.
The use and function of test blocks are explained, along with how to inject current for testing. CT connections for REF protection and its zone are covered, as are lockout contacts used in parallel with high impedance lockout relays. Overvoltage protection in REF and relay power supply connections, including relay watchdog contacts and test block functionality, are also discussed.
The course clarifies the difference between tripping and lockout relays, how to reset lockout relays (both mechanically and electrically), binary input circuits, and the complete operation of lockout relays, including their tripping and lockout circuits and contact details. Finally, it covers Trip Coil 1 & 2 circuits, Breaker Failure initiation, Trip Circuit Supervision relays, Close Block features, alarm and SCADA circuits, device details, and panel layouts.
Overall, ‘Learn Transformer Protection Panel Schematics’ is a highly recommended course for electrical engineers, technicians, and students seeking to gain a practical and in-depth understanding of transformer protection panel schematics. The instructor’s expertise and the comprehensive coverage of topics make this course a standout resource.
Enroll Course: https://www.udemy.com/course/learn-transformer-protection-panel-schematics/