I vote with Scotty as well. Generally speaking, a short circuit is a specific type of fault, in most textbooks this is referred to as a shunt fault. If you've worked for a utility you know that an open conductor (this can occur without a short circuit) is a definitely a fault, and clearly not a...
On the 50N vs. 50G issue SEL is backwards from the IEEE standard. 50N in an SEL relay is the measured value, whereas 50G is the calculated value Ia+Ib+Ic=Ig. The IEEE standard states 50G is measured and 50N is calculated.
I agree that diff. protection will help, as previously posted, however, if your primary concern is arc flash why not use an optical arc detection system designed for this purpose. It would probably be easier to install since CT inputs from each breaker are not required. Just a thought,
suhag
My experience is that the HMI is great as long as it functions properly. At some point in the future it is possible that the TouchScreen or HMI computer will fail. In this scenario the only way for an Operator to open/close CB's is through the front panel of the relay. Most operators are not...
I really liked using the Dranetz PX5 and 4300. The Fluke 434 doesn't have the flexibility and ability to set triggers the way I would like. The PX5 has a color touch screen and a compact flash card which makes interfacing with the meter very easy. Hope this helps
