Linkedin Twitter Facebook

System Study

Back

SHORT CIRCUIT

The relatively high currents, flowing as the result of a fault in an electrical system, produce large amounts of destructive energy in the forms of heat and magnetic forces. After the initial design and before the implementation of an electrical distribution system, short circuit system study is a critical, yet, most of the times, an overlooked step. An independent third-party study conducted during or after the electrical equipment submittal process would be highly valuable. The protection for an electrical system should not only be safe under all operating conditions but also be able to insure continuity of service for which, it should be selectively coordinated as well. A coordinated electrical system is the one in which only the faulted circuit is isolated without disturbing any other part of the whole system.

 

The elensol short circuit system study ensures that the protective device ratings within a power system are adequate for the maximum currents that flow during a fault. We conduct these studies to guarantee that the protective devices have adequate interrupting current capability, to make certain that power system components can withstand mechanical and thermal stresses that occur during a fault, and to calculate the current data for the protective device coordination studies. We use computer-based modelling to calculate maximum three-phase short circuit currents, which are compared to the ratings of the protective device component short circuit currents.

 

A short circuit system study is important in the safe, efficient and economical operation of any electrical power distribution system, ensuring that personnel and equipment are protected by establishing proper interrupting ratings. The consequences, when an electrical fault exceeds the interrupting rating of the protective device, can be really devastating, including injury to personnel, damage to electrical equipment and costly downtime. The elensol short circuit system studies maximise power system selectivity by isolating faults to the nearest protective device and by helping to avoid nuisance operations that are due to transformer inrush or motor starting operations.

 

The elensol short circuit system studies facilitate to incorporate all the system changes that come about after the initial design, for example, changes like the size and/or transformer impedance values, the utility available fault level, the addition of motors, the system operating parameters, and the conductor size/type. These studies protect and maximise the operating efficiency of your power system design. Our short circuit system studies cover fundamentals of symmetrical components and their applications in analysis of short circuits; use of per unit systems and comparison with physical units; impact of short circuits on power systems with respect to power system stability, reliability, power quality and protective relaying; and impact of rotating machines on short circuit calculations.