Protection Engineering Basics and Schemes Protection Engineering

Interconnection of relays and panels is done by about 6sqmm low voltage insulated wires as modern relays are low voltage operated with very low burden. i am taking one example for capacitor panel protection engineering drawing , and we will try to understand it what that drawing informing us. in all drawings , they 1st give you contents of drawing then legends , but remember some legends must be on engineer finger tips , K symbol is universally accepted for auxiliary relays, remember auxiliary relays are relays used for circuit isolation, multiple contacts and indication purposes . Q symbol is for Breaker, Relays will be shown by their ANSII numbers like     pg. 74 51 for OC 51N for Earth Fault overcurrent Relay 64G for ground Detector relay 74 for trip circuit supervision relay

Protection Engineering Basics and Schemes Protection Engineering | Page 74