Mastering Medium Voltage Schematics Episode 03

Dear All,

Welcome to the course about "Mastering Medium Voltage schematics". This training is start from very basic level to advance level. Focus has been given to deliver the practical and hands on knowledge.

Trainer have over 18 years of field experience and has worked at 11/132/220/500kV Substation, 1263MW power plant, 660kV HVDC system.  worked with several companies, SIEMENS, ABB, GE, SEC, KE, WAPDA, NTDC, ARAMCO, SABIC, MARAFIQ. Trainer has given hundreds of trainings online and offline, so it will be great to join this training and take advantage of field experience.

This online course is part 03 of the Mastering Medium Voltage Switchgear drawings.  In this part we have covered the following topics.

•Trip Command and logic table

•Trip coil save scheme

•Anti slam scheme

•Trip free scheme

•CB Trip control Local / Remote / Emergency / OFF

• Tripping from Local / Remote

•Tripping from Emergency

•Trip coil 1 & 2 circuit

•Tripping from OC relay

•Tripping from BB relay

•Tripping from UV / UF Relay

•Trip circuit supervision relay

•Sold DC, Ghost DC, Return DC

•Test Lamp

•ABB TCS Relay

•MVAX 11, 12 ,13 TCS Relays

••Indication circuit

•Binary input circuit

•Loop supervision

•DC supply supervision

•Interlocking of OG feeder with Earth switch

•Trip Circuit Supervision Alarm and Close block logics

•Each TCS create alarm

•Both TCS fail means CB can’t be open if closed, that is dangerous

•Concept of CB close block if both TCS fails

•When to monitor healthiness of TC , CB is closed or open

Concept of Ghost / Fake DC, Solid DC & return negative and positive supplies.

•What is it mean by Solid DC

•What is return negative or positive

•Ghost / Fake DC

•Use of Test Lamp

•Test lamp supersede any high-tech tools for trouble shooting

Trip circuit supervision relay SPER 1C1

•Continuous monitoring of circuit-breaker trip circuits and other essential control circuits

•Preset operate time preventing unwanted alarm signals at circuit-breaker operation

•Indication of relay operation with LED indicator on the front panel and output relay

•Detects bad contact, contact welding and auxiliary voltage failures in the supervised circuit

TCS Supervision Relay MVAX12

Best Regards