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.

Auto Transfer Switch ATS transitions in Data center

Auto Transfer Switch ATS transitions in Data center: A R&D Telecommunication and POP Internet Company had reported an UNUSUAL PROBLEM of Data Center Blackout, which infrequently, and out-of-the-blue, blacks out its entire data center load. In-addition, it had reported multiple incidents of alternator winding failures with its emergency DG. An inquisitive engineer always wondered why the Auto Transfer Switches are so overdesigned. Well, the answer lies in the "Waveform-and-RMS View" of this case study, as enclosed in the caption picture above.