Aleen

Optical Ground Wire For Communication Between Power Substations

With the advent of modern microprocessor relaying, much of the communication between relays has been shifting from power-line-carrier apparatus or microwave to fiber. Since power utilities own the easements for the high voltage transmission lines, it is only logical to install fiber up there. One ingenious location is the lightning shield wire. It is the …

Optical Ground Wire For Communication Between Power Substations Read More »

Who Controls the Power Grid in USA?

Have you wondered what goes on behind the scenes of electric power delivery in America? This post explains who is controlling the flow of power on the grid and who is policing to ensure the reliability requirements are met.

Ground Fault Current Path

Choosing Between Resistor and Reactor for Neutral Ground Impedance

Faults involving ground produce high fault current magnitude especially when the transformer(s) neutral is solidly grounded. The neutral ground circuit in the transformer provides the return path for the fault currents. To limit this current, impedance – either in the form of a reactor or a resistor – is installed in the neutral circuit. See …

Choosing Between Resistor and Reactor for Neutral Ground Impedance Read More »