Our technical engineers understand different types of arc faults. It’s an unintended or abnormal link of various live elements. The connection can be either to earth or with other elements. Such connections have very low impedance and for this reason, the flow of current through them is large. The amount of energy that is present within these fault currents can heat up different components very fast. Now, this heat energy can generate highly excessive forces and can be a cause of devastating explosions.
The highest amount of fault current goes through 3-phase faults but there are some exceptional cases as well where earth faults and phase-to-phase faults give more currents.
3-phase faults : In this fault, all the phases are shorted together which means that L1, L2, and L3 are linked. Finding the fault current within the network at any point is done by summing all the impedances within the entire electrical system from the source to supply and this summation also includes the source along with the point where the fault has taken place.
Although symmetrical faults are considered as the most severe due to large fault currents, the single-phase to ground faults are the frequents one that occurs. If you don’t take the single-phase fault properly it may grow to a symmetrical fault which is most severe.
Earth Faults : In this fault, one of the phases is directly linked with earth. For instance, any one of the phases including L1, L2 or L3 is directly earthed. For the purpose of finding the fault in the network at a given point, all earthed impedances are summed within the network in between the supply source and the impedance of the return path. This sum also includes source impedance.
Open-circuit fault : There is a fourth type of fault as well and it is known as the open-circuit fault. However, this fault doesn’t create a short circuit. This fault is initiated by the current that is interrupted unintentionally. Therefore, it is absolutely necessary to install the protective system so that they can prevent any damages to the equipment and also save people from any harm in all the above-mentioned situations.
Phase-to-phase faults : These faults have two phases connected with each other for instance L1 is linked with L2. Like the previous case, the fault current is the voltage (nominal applied) divided by total impedance.
Our engineers can assess all these fault types quickly and come up with a solution after going through all the calculations. We at NY Engineers understand how all these phases work and our staff has plenty of experience when it comes to handling different faults and calculating their arc currents.