MG6047 – Protection

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Module code
Module title
To enable the students to gain an understanding of electrical power system fault protection concepts for both MV & HV systems.
  • SC1001
NZQA Level
Level 6
NZQA Credits
Delivery method
  • Web-Enhanced
Learning hours
Directed hours
Self directed hours
Total learning hours
Resources required
Learning Outcomes
1.Explain the operating principles of current and voltage transformers in terms of various construction types in accordance with industry practice.
2.Apply protection concepts as these would apply to generators, power cables, transformers, aerial conductors, busbars and motors.
3.Analyse the types of fault that occur in electrical power systems, for LV, MV and HV.
4.Explain and apply the different power system protection equipment types under various common protection scenarios.
5.Apply safe working practices in relation to power protection equipment.
6.Apply digital protection and control systems to basic substation design.
Explain typical industry terms, unit and zone protection, discrimination, reliability, selectivity, speed of operation, sensitivity, stability, prospective short circuit currents (psc), primary protection, backup protection, relay pickup current, instantaneous relays, inverse time relays, inverse definite minimum time relays, definite time relays, translay systems (pilot), graded.
Apply the types and classes of CT, VT & CVT to typical industry scenarios.
Determine the characteristic curve for a CT (eg magnetisation curve, knee point saturation, protection verses metering types, ratios).
Demonstrate awareness of safety matters in regards to an open circuited CT.
Apply relay setting(s) to an IDMT electromechanical relay and modern IED relay.
Typical fault scenarios that occur in electrical power systems, for both MV and HV.
Application of protection systems for generators, over-head power lines, power cables, transformers, busbars and motors.
Design of SLDs and applying protection schemes, SCADA and related communication systems for modern IED relays (IEC61850), and relay symbols (ANSI, IEC and DIN).
Basic substation design.
Assessment Criteria
Assessment 1Assignment20
Assessment 2Tests40
Assessment 3Exam40