Electrical Grid Training Module 15A | Protection Relays Commissioning

Electrical Grid Training Module 15A covers protection relay testing and commissioning from differential and distance protection to end-to-end scheme verification. This lesson explains safe secondary injection, trip-path control, teleprotection checks, traceable event evidence and final restoration. TOPICS COVERED • Approved setting files, protection philosophy, CT/VT ratios, schematics and trip matrix • Line/cable 87L/87C, transformer 87T, reactor 87R and 87TEE differential tests • Circuit breaker fail 50/62 plus busbar, transformer and reactor stability tests • Directional 67Q and 67/67N current and earth-fault protection • Overcurrent, undercurrent, voltage, frequency and ROCOF elements • Restricted earth fault and high-impedance busbar protection • Distance/impedance 21 zones, reach, timing and teleprotection • Trip-circuit supervision, trip-coil 94, lockout 86 and auto-reclose 79 • Synchronism check 25 and live/dead close-permissive logic • CT supervision and capacitor-bank protection • End-to-end trip send/receive, synchronized SOE, SAS and channel evidence • Settings, checksums, binary I/O, screenshots, certificates and witness sign-off VIDEO CHAPTERS 00:00 Module 15 overview and protection-relay scope 00:23 Standards and reference governance 01:39 Line and cable differential relays 87L / 87C 06:34 Circuit breaker failure protection 50 / 62 08:54 Busbar stability and sensitivity 11:48 Transformer differential 87T and stability tests 18:14 Reactor differential 87R and stability tests 22:23 Directional current protection 67Q / 67 / 67N 27:38 Voltage relay and restricted-earth-fault tests 33:23 Distance / impedance protection relay 21 58:30 Overcurrent, undercurrent and frequency relays 1:03:24 Trip circuit supervision relay 1:05:33 Synchronism check relay 25 1:19:23 Lockout 86 and auto-reclose 79 1:24:11 CT supervision and high-impedance busbar 1:29:31 Capacitor-bank and 87TEE differential protection 1:35:27 Trip coil relay 94 1:37:47 End-to-end protection scheme testing CORE ACCEPTANCE RULE No approved settings, protection philosophy, schematic and trip matrix, no test. No safe CT/VT boundary and isolated trip/close outputs, no injection. No verified pickup, timing, logic, trip path and event evidence, no acceptance. No restored test plugs, CT shorting, links, channels and settings, no release. No complete evidence package, no closure. INTENDED AUDIENCE Protection, commissioning and substation engineers, relay-test teams, utility and OEM specialists, teleprotection/SAS engineers, QA/QC teams, contractors, operators and technical trainees. SAFETY NOTICE This video is for professional training only. Relay tests can initiate breaker trips, close commands, lockout, auto-reclose and interstation transfer trips. Only authorized and competent personnel may isolate CT/VT circuits, manage CT shorting, install test plugs, inject current/voltage, alter settings, force binary I/O, simulate breaker status or test trip, close and teleprotection paths. Never open-circuit an energized CT secondary. Prevent VT backfeed, unintended breaker operation, remote trips, source paralleling and protection left blocked. Confirm PTW/LOTO, trip/close isolation, breaker simulator, supplies, communications, channel test window, barriers, PPE and instrument ratings. Reduce injection to zero before moving leads. After testing, remove temporary leads/forcing and restore CT shorting, links, test plugs, channels, settings, protection, alarms, SOE and SAS indications. Follow approved procedures, switching orders, risk assessments, OEM instructions and the site authority. Project-specific settings, curves, logic, tolerances and timings always govern. Subscribe for the complete 18-module Electrical Grid Testing and Commissioning series. #ProtectionRelay #Commissioning #ElectricalGrid