Trihal cast resin dry type transformers (ENG) - Trinet

ing current, and in addition, can make the transformer itself generate harmonics.4. RemediesThe existence of harmonic currents and their consequences in an electrical networkoutlined above makes it necessary to :• quantify the pollution level by calculation or by measuring harmonic currentsand voltages.• eliminate any risk of resonance within the range of harmonics encountered byseeking the lowest possible ratio (technical-economic) between capacitor powerand the supply’s short circuit power.• attenuate harmonic pollution⇒ separating pieces of equipment from one another by assigning a transformerto each of them (attenuating interference since the impedance ofthis part of the network is lower than that of a global supply).⇒ installing harmonic filters :series filter (also called resonance filter or high-pass)parallel filter (also called a stop filter or low-pass).• oversize the equipmentin spite of the above measures it is essential that equipment⇒ can withstand overloading due to any harmonics which may be present⇒ tolerates the nuisance with minimum effect.F:Dcial/MK/MKT/InfoMK/Anglais/GENERAL/TIGEA09 5