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Two photon annihilation processes were observed with the TASSO detector at the e+e- storage ring PETRA. We report on the analyses of untagged and single tag events. We select untagged events with a two prong final state seen in the central detector and compare these data to the prediction for two photon QED processes. We observe an excess of events in the expected invariant mass range for the...
Generation connected to the transmission system via inverters (electronically coupled generation) is a growing. Utility protection engineers conventionally use impedance matrix algorithms to determine fault current magnitudes and angles, perform coordination studies, and guide relay settings. In transmission protection studies, it has thus far been common practice to exclude the fault current contributions...
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