Share IEE C5 - C7
Save to Folder
It is an electric power system can be defined as, any abnormal condition of the system that involves the electrical failure of the equipment, such as, transformers, generators, ETC.
Fault
What are the four types of fault?
Open Circuit Faults; Short Circuit Faults; Symmetrical Faults; Unsymmetrical Faults
It is also called Series Faults and it occurs due to the failure of one or more conductors.
Open Circuit Fault
It is also called Shunt Faults. It can be defined as an abnormal connection of very low of impedance between two points of differential potential and is the most common and severe kind of fault.
Short Circuit Fault
It is also called Balanced Fault. This fault occurs when all three phases are simultaneously short-circuited.
Symmetrical Fault
What are the two kinds of Symmetrical Fault?
LLL Fault; LLLG Fault
The most common faults that occur in the power system network. These faults are also called unbalanced faults, as they cause unbalanced currents in the system.
Unsymmetrical Fault
70-80 percent of the faults that occur in power systems are of this type. These are very less severe faults compared to other faults.
Single-Line-to-Ground Fault
It occurs when a live conductor gets into contact with another live conductor. Heavy winds are the major cause of these faults.
Line-to-Line Fault
It occurs when two lines come into contact with each other as well as with the ground. These are severe faults.
Double-Line-to-Ground Fault
Two reasons why insulation may fail?
Fail because of its own weakening; Fail due to overvoltage
Do faults cause heavy currents to flow?
Yes.
Over-currents, in general, cause overheating and attendant danger of fire. (T or F)
True
Overheating does not cause deterioration of the insulation, thus strengthening it further. (T or F)
False
Transformers are known to have suffered mechanical damage to their windings, due to faults. (T or F)
True
These are generated by interconnecting the sequence networks for each of the components.
Sequence Network
