When Harmonic resonance strikes a grid

When Harmonic resonance strikes a grid, at its 33kV power distribution system, it results in a massive total voltage harmonic distortion, THDv magnification, within the affected power system at the grid supply zone. The order or number of individual voltage harmonics, are around the grid's natural resonance frequency range. It results in a large voltage oscillation, and fluctuations in the forms of simultaneous incidents of voltage sags and swells.

Effects of Lightning bolt on Power system

Effects of Lightning bolt on Power system:  A 220kV double circuit parallel grid power transmission line-1 and line-2 were supplying to an integrated steel plant with a maximum demand of 500MW. Each 220kv grid incomer PCC was connected to 2sets of 155mva, 220kv/33kv grid transformers. Power Quality measurements were carried-out at the common 33kv secondary bus, wherein all four grid transformers were connected in parallel.

Power system at transient stability limits

Power system at transient stability limits:  A 220kV double circuit parallel grid power transmission line-1 and line-2 were supplying to an integrated steel plant with a maximum demand of 500MW. Each 220kv grid incomer PCC was connected to 2sets of 155mva, 220kv/33kv grid transformers.  Power Quality measurements were carried-out at the common 33kv secondary bus, wherein all four grid transformers were connected in parallel. High wind swayed a tree over line-1, about 5km upstream of the steel plant.

Slip Ring Induction Motor start inrush current after Harmonic Filter

Optimization of Slip Ring Induction Motor in Fiberizer Drive in a Sugar milling unit - after HARMONIC FILTER INSTALLATION: The overall energy efficiency of a 5000TCD cane sugar mill with a 25mW co-generation power plant and 31.5MVA, 11kV/110kV grid synchronization transformer, improved by 14.3% to 19.1units per ton of cane crushed from its earlier level of 22.3units. How was the energy saving achieved? Well, in this case study we shall find that out with sugar industry's most sensitive and yet rough and tough drive load, the Fiberiser.