Because it is the first thing that goes bump in the middle of the night. Actually with the growth of our contry, per say, businesses relocating to areas that have not upgraded their power source feed stations in who knows when, since electricity was enabled to the masses, are now placing operation strains on the power gridd. This also has to do with the fact of the good ol boy, monopoly of the power corporations not willing to spend the revenue to upgrade and keep up with the growth factor as well. So when there are these powerfull storms raging across the country, and a big ol twister drops down and just creates all kinds of trouble, which inturn sends out a fault ripple on the power gridd. Which in turn, causes that ugly bump in the night, thus creating a great deal of damage to the end items.
To help you along the way, IMO, I would go with a double-trouble mind set for your protection. Generator back-up, UPS back-up, and for the fault, we have a dual fault sensory at our installation. One for power spykes in the MVA, and the other for drop off. We use automated switch gear, first switch is the UPS and then the generator back-up comes on line with in 30sec after switch transfer is enacted. Maximo
Thank you very much for your reply. Do you have any idea to follow which reference book or hand book for Relay setting calculations. Because it plays important role in the field of design and protection. I heard some one saying we have to keep a minimum of 250ms discripency between one level to other level. is it correct? pl. tell me the book and author name for relay coordination if you know.
Fault level
Re: Fault level
