Accurate models of Overcurrent (OC) with inverse time relay characteristics play an important role for coordination of power system protection schemes. This paper proposes a new method for modeling OC relays curves. The model is based on fuzzy logic and artificial neural networks. The feed forward multilayer perceptron neural network is used to calculate operating times of OC relays for various...

DISCLAIMER The observations articulated in this report and its appendices represent Ross & Associates' interpretation of the research, case study information, and interviews with lean experts and do not necessarily represent the opinions of the organizations or lean experts interviewed or researched as part of this effort. U.S. Environmental Protection Agency (EPA) representatives have reviewed...

Power systems are naturally exposed to several fault conditions, namely short-circuits. Automatic protection and control systems are responsible for selective tripping of faulted devices and their subsequent reconnection. An application to automatically diagnosing abnormal conditions in power distribution network substations is described in this work. It is based on a model of the power network...

DISCLAIMER The observations articulated in this report and its appendices represent Ross & Associates' interpretation of the research, case study information, and interviews with lean experts and do not necessarily represent the opinions of the organizations or lean experts interviewed or researched as part of this effort. U.S. Environmental Protection Agency (EPA) representatives have reviewed...

Realization of microcontroller based real time fire protection system is considered and described in the paper. Given solution is based on application of microcontroller AT89S8253. The system is consisted of set of sensors connected to control device (microcontroller module). Control, monitoring and diagnostic are performed via computer of PC type serially connected with control device. Charact...