Factors affecting Clerance :
Factors affecting Crepage :
K factor of transformer is its ability to serve the nonlinear loads without temperature rise, Higher the K-factor greater the capacity to withstand harmonic heating effects.
Short-Circuit fault allows the current to flow through unintended path with very low impedance, which results into excessive current flow through the path.
Typical safe ability of Transformer, Generator and Cable to withstand Isc – short circuit fault current in multiple of its In – rated current, without damage to the equipment.
Unbalanced 3 phase system can be resolved into 3 balanced systems – Positive, Negative and Zero Sequence Symmetrical components.
IEC 61439, Low Voltage Power Switchgear and Controlgear ASSEMBLIES. Discrimination between TTA and PTTA eliminated by verification approach.
While commissioning Assembly, Switchgear Nameplate gives important information, characteristics, Energy, Short Circuit, Accordingly Safety can be ensured.
Nonconducting material that provides electric isolation of two parts at different voltages.
It must have an electrical resistivity and a dielectric strength sufficiently high for the given application.
The secondary requirements relate to thermal and mechanical properties.
Clearance is the shortest distance in air between two conductive parts. Minimum Clearance required to withstand transient overvoltages as per IEC 61439.
Protection degree provided by Assembly against ingress of solid foreign particals and liquid is indicated by the IP code.