Tutorial4
Q1. A transformer feeder AB is fed at A at 33kV where the threephase fault level is 1000MVA.
The protection at the A end comprises 500/5A CTs and overcurrent IDMT relays. The
transformer at the B end is rated at 20MVA, 33/11kV, leakage impedance
Tutorial3
Q1 An 11kV, 10MVA, 50Hz, threephase generator of 0.08 per unit reactance and negligible
resistance, is connected to an 11/33kV, 12MVA transformer of 0.02+j0.05 per unit impedance. A
line having a series impedance of 2+j4 ohms/phase is connected
How does the fault current flow in a singlelineto
ground fault?
Tutorial5
The fault current flows back to each source or each
generator through earth soil.
Fault
Generator
G1toG10arethegenerators.
1
Review on grounding system:
Potentialatneighbouringpoint
Tutorial2b
Q1 The primary and secondary windings of a 40kVA 6600/250V singlephase transformer have
resistances of 10 and 0.02 respectively. The leakage reactance of the transformer referred to
the primary is 35. Calculate:
(a) the primary voltage required
Tutorial 1
1. The electrical installation of an industrial site is supplied by three-phase 415V with the
following loads:
100 60W lighting points
20 50W exhaust fans (permanently connected)
80 10A 1-phase single socket outlets
10 15A 1-phase socket outlet
Tutorial6
Q1. An industrial site (3phase 415V, 50Hz) has the following loads:
(i) Lightings of 150kW in total
(ii) Two 75hp induction motors with 85% efficiency at 0.88 lagging power factor.
(iii) One 100hp synchronous motor with 90% efficiency at unity p
ELEC/TELE9713
Industrial and Commercial Power System
Course Outline Semester 1, 2016
Course Staff
Course Convener:
Dr. ZHANG Daming, Room 650/651, E10, daming.zhang@unsw.edu.au
Consultations: You are encouraged to ask questions on the course material, aft
Course outline
The University of New South Wales
Topic 1 Overview
Topic 2 Switchboards
Topic 3 Cables and busbar systems
Topic 4 Distribution transformers
School of Electrical Engineering
and Telecommunications
Topic 5 Fault calculation
Industrial and Com
The University of New South Wales
School of Electrical Engineering
and Telecommunications
Industrial and Commercial
Power Systems
Topic 1 Overview
Dr. Daming Zhang
Room 651 E10
Ph. 9385-4070
Email: daming.zhang@unsw.edu.au
1
Course outline
Topic 1 Overvie