I am looking for a line profiler that logs amps and individual harmonic currents, preferably with the capability of downloading wirelessly. There is a company called Gridsense that has devices called LineTrackers that can be downloaded via receiver/transmitter, but they only record amps; no...
I have been assisting someone with a failures of electronic boards in equipment made overseas. The equipment is rated at 110 VAC +/- 10%. Monitoring reveals the voltage to the site is well within recommended limits for 120 volt service 114-126 volts, most of the time around 121-123 volts. This...
I have been asked a question by a coworker at a utility about whether it better to install each phase of conductors from a distribution substation transformer in its own separate PVC conduit or to put all three phases in one conduit. Generally, we always see each phase plus the neutral in...
Does anyone have a reference for the recommended interval of maintenance and inspection of motor contactors? This would be a recommended practice or interval for inspecting the contacts for pitting and wear, etc.
thanks
jack
I have an industrial customer that suffered damage to a 200 hp Baldor 18H Vector Drive. A worker disconnected power to the system, and then about a minute later the plant tripped off. Our substation recloser control saw an OCR (breaker) alarm for min trip level of the OCR, but it didn't trip...
Our utility has a customer that co-generates to the grid with a 5 MVA coal powered steam generator. It is synchronized to the grid. Our substation (5/6.25 MVA xfmr) cannot supply the entire factory, nor can the generator, unless they shed some load.
Recently, this customer called to inform us...
