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Linear Grounding against Total Harmonic Distortion (THD) based on Faden Spectrum Phenomenon
  • Prof. Hazar Shtat,
  • Nazih Haider
Prof. Hazar Shtat

Corresponding Author:[email protected]

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Nazih Haider


This research deals with the effect of capacitive and inductive harmonics on the efficiency of electrical and electronic devices used in installing a giant screen owned by Faden Spectrum Company that was installed on one of the huge towers in the city of Al-Khobar in the Kingdom of Saudi Arabia, with an area of 2000 m2, and it consists of 2000 cabinets containing 2000 electrical cells, each cell having an area of 1 m2.
The problem was solved -Significantly - by linear grounding, that provided creative also solutions for four similar screens of relatively smaller size, which may allow this type of grounding to be generalized to all electrical networks with similar problems.
The engineering team, under our supervision, worked to reduce the annoying noise coming from the main feed box (MDB), which was increasing steadily with increasing lighting intensity, to become 90 dB at 60% brightness and 155 dB at 100% brightness, by building an independent linear grounding.
It deals to grounding the zero point of the transformer and this applies to the screen feeding system as a whole, provided that the old grounding remains as grounding against touch currents to protect individuals from electrification.
Our engineers succeeded in reducing the noise caused by harmonics from 95dB to 55dB at 50% brightness (which is the normal operating rate for this type of screen at noon).
The apparent amperage on neutral has also been reduced to 438A instead of 811A at the same brightness rate.
This solution is reduced the size of the Active Harmonic Filter to less than half, saving a lot of money when the customer wants to reach typical values by used the THD Filtering.
03 May 2024Submitted to TechRxiv
06 May 2024Published in TechRxiv