A problem lately has been motors dropping out without tripping breakers and no legitimate reason. The obvious is to test relays and breaker settings and applying a monitor on to the line. We have not done a lot of maintenance in the past three years. Can there be issues with loose wiring causing...
The connectors used on an old installation were copper and the cables aluminum. Has anyone heard of thermal runaway where the contact surface of the lug eventually breaks down after 40 years of service. Understanably, this is not the right connector to use for aluminum cable because it is...
A boiler feedwater motor for the deareator in a unit that the RTD's increase in temperature when the pump's minimum flow bypass is opened. These are VFD motors, but are operated at full speed when the minimum bypass is opened on low discharge pressure. Why would temperature increase?
Simultaneous electrical faults at three separate load interrupter (LI) switches at two separate substations.Voltage levels are 13.2KV -480V. They are high resistance grounded.. About 22 seconds later two other LI’s faulted at same substation and opened the upstream feeder breaker. Four switches...
A 480 volt breaker has failed several times and has been replaced. It is tied to a pump. What is general root causes of several breaker failures over time at this low voltage?
