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HARMONICS MITIGATION BY USING ISOLATION TRANSFORMER IN ELECT

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ANWAR AFIFI

on 10 June 2015

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Transcript of HARMONICS MITIGATION BY USING ISOLATION TRANSFORMER IN ELECT

Thank You!
HARMONICS
Harmonics are sinusoidal voltages or currents having frequency that is an integral multiple of the fundamental frequency.
OBJECTIVE
To mitigate harmonics by using isolation transformer

To identify whether the isolation transformer can reduce harmonic content distribution system
ANWAR BIN AFIFI
2012405534

HARMONICS MITIGATION BY USING ISOLATION
TRANSFORMER IN ELECTRICAL DISTRIBUTION SYSTEM

ISOLATION TRANSFORMER
Isolation transformer components include a primary and secondary winding having a 1:1 ratio, a magnetic core and a grounded electrostatic shield between the primary and secondary winding.
CONCEPT
SIMULATIONS RESULT
Full Bridge Rectifier (V-THD)
before isolation transformer: 0.63 %
after isolation transformer: 2.13 %

Multilevel Inverter with PWM (V-THD)
before isolation transformer: 111.83 %
after isolation transformer: 112.28 %
PC LOADS
Simulation (V-THD)
before isolation transformer: 1.97 %
after isolation transformer: 2.93 %

Real-Time Monitoring (V-THD and I-THD)
Point B: 3.0 % and 57.9 %
Point A: 1.3% and 55.1 %
POINT B (outgoing)
POINT A (incoming)
These findings indicate that isolation transformer can suppressed both the voltage and current harmonics in electrical distribution system.
The idea is to protect the supply from harmonics that originates from non-linear loads. As a result, the supply will have better performances and longer life expectancy.
This analysis proves that isolation transformer is very important to be installed in power distribution system.
This study of isolation transformer was proven in both simulation and real-time monitoring, on that account, both adjectives were proven and achieved.
A lower THD is achievable, especially for voltage, but voltage distortion comes from current distortion. The source of current distortion is the non-linear load itself, pointing back to equipment settings by the manufacturer.
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