DE6401

Module code

DE6401

Module title

Power systems 1

Prescription

To provide the students with an understanding of three-phase power systems with an emphasis on generation, distribution and transmission systems.

Programmes

EN1603
SC1101

NZQA Level

Level 6

NZQA Credits

15

Delivery method

Not Web enabled

Learning hours

Total learning hours: 150

Resources required

Learning Outcomes: Describe the New Zealand Power System and explain key aspects e.g. system control, basic terminology (GXP, GIP, infinite bus, frequency and load control, spinning reserve, control periods, ripple and load control methods)
2.Describe the types of generation systems in use in NZ (large scale 1000kW - hydro, geothermal, thermal, co-generation). (I.e. an overview)
3.Describe the transmission system (aerial, towers, HVDC).
4.Describe the distribution system (up to 66kV, cables and aerial, district and zone substations).
5.Describe the application of power transformers in a MV and HV environment.
6.Describe the process of generator synchronisation.
7.Earthing systems for MV and HV networks (direct, isolated, NER, GFN).
8.Describe and apply the process of current interruption and selection of appropriate switchgear.
9.Describe and apply basic SLD design and perform basic fault levels (e.g. up to 4 generators, 4 transformers and 2 feeders).
Content: New Zealand's power system - control and operation, power stations, main power transmission lines, major substations, the DC inter-island power link, voltage and frequency control, reliability of supply, and purity of waveforms.
Principle of operation, and overview of the characteristics of cylindrical and salient pole synchronous machines. Operation of generators stand-alone, in parallel, and on an infinite busbar.
Construction, principle of operation and maintenance of overhead lines, towers, conductors, insulator, distribution links, line inductance, capacitance, and resistance. Voltage, current, and power flows in short, medium and long lines.
Operation and use of surge arrestors.
Construction and operation of power cables, insulation, conductor material, formation of conductors, current capacity, capacitance, inductance, losses, and installation.
Causes of faults and their effects, limiting fault currents, fault magnitudes for both symmetrical and unsymmetrical faults.
Development of a simple SLD.
Current making and breaking capacities of switchgear & HV fuses.
Operation and use of autoreclosers and sectionalisers.
Neutral-earthing methods, insulated neutral, resistance earthed neutral, solidly earthed neutral. (MV and HV).
Assessment Criteria: Assignments, Tests40
Laboratory (Practical)20
Examination40

DE6401 – Power systems 1