Helping the mining industry grow in a sustainable wayLearn more
Energy education from anywhere for efficiency everywhereFree Online Courses
Your fastest way to answers!Download Now
Schneider Electric Egypt×
Explore our global offerings or select your country from one of our five regions.Global
Découvrez nos offres globales ou sélectionnez votre pays dans l’une de nos cinq régions.
The Prospective Short circuit capacity mentioned in drive catalog is indicating the drive's suitability to use in a electrical feeder with out any additional input impedence to the line supply. It means, for example the drive ATV61H075N4 can be used up to 5KA short circuit current rated supply feeder with out any problem. If the supply feeder's SCC rating is higher than the value mentioned in catalog, it is necessary to use a line choke or DC choke to increase the input impedence of the drive, which will help to increase the PSCC rating of the drive above 50KA to 100KA. It will also help to reduce the peak current, RMS current and harmonics. The doccument in below attachment will help to explain the effect of PSCC in drive functioning in detail.
Generally there are two topics concerning the short circuit capability of the mains:
A strong mains supply (= high Isc) has a low impedance. Therefore it allows high peak current, RMS current and harmonic, which can overload and damage the rectifier and DC Bus capacitors of the standard drive.
With a DC choke (which is behind the rectifier) a Isc of 50kA is allowed.
With a line choke (which is in front the rectifier) a Isc of 100kA is allowed.
b) In case of a short circuit:
If there is a short circuit the protective device (fuse or circuit breaker) must be able to interrupt this high current. If this is not the case, it will burn the drive input.
Sign up for all the latest solutions, offers and best practices straight to your inbox.
We are excited that you have joined the group. You will receive your welcome email soon describing the program and what to expect in the upcoming weeks. Enjoy!