The Study on the Effects of Cable Capacitance on the Behaviour of Triplen Harmonics Produced By Synchronous Generator

the heavy usage of electronics equipment today has increased the amount of harmonics
!lowing in power system. This can lead to power quality problems. Harmonic by definition is
~ component of a periodic wave having a frequency that is an integral multiple of the
fundamental power line frequency. Harmonics get more complicated in three phase
~pplication. In three phase application, we have to deal not only with phase conductors, but
also the neutral conductor, triplen harmonics and sequence harmonics. Triplen harmonics
are the odd multiple of third harmonics (3'd, 9th, 15th, etc.). Trip len harmonics currents are
the major cause of heat because they add together in neutral conductor. The magnitude of
triplen harmonics currents can approach twice of the phase currents. Neutral conductors
were designed with the ampacity as the phase conductors and when triplen harmonics
currents add at the neutral, it causes them to overheat. The effect of this has been known
from previous published journals. In this project, the author wants to find whether cable
capacitance will have the same effect as neutral conductor. Any two conductors separated
by a distance can store a charge. So any two wires in a cable can store a charge. This is what
we called cable capacitance. In the experiment, capacitor will be introduced at each phase
wire (red phase, yellow phase and blue phase) to act as cable capacitance. The triplen
harmonics currents will be measured at capacitor to see whether capacitor affect how
triplen harmonics currents produced by single generator behave in a power system. After
the data have been gathered, it will be used to model the circuit in PSCAD. The purpose of
this is to find the right source to be used in PSCAD simulation. The author hope by the end
of this project, the findings will help the industry to reduce or suppressed the amount of
harmonics and also detect the harmonics present in the power system by using simulation.