I'm working with a European company providing some control equipment for an off shore drilling unit. According to the specifications, the available power feed to our control system is 690V Delta "RI". I am having trouble with the "RI" definition ... basically I can't find a description for...
I recently ran into a client grounding scheme that I'm not too familiar with. I could use some insight from the group.
For instrumentation (pressure transmitters, for example) and communication (serial coms), they connect the sheilds to a cabinet ground buss labled "IE" which I'm assuming is...
Looking for some technical insight or a pointer to better understand a problem recently.
A customer has a UPS (on off-line ferroresonate type) providing backup power for a control system. Because of power quality issues at another customer site, they have installed a power conditioning...
Looking for a formula to calculate motor heat load dissipation. I have a 100hp TEFC motor (460V 3ph) on our shop floor running continuously under normal load. In sizing a ventalaion system for this area, I'm trying to account for the heat generated by the motor.
I'm trying to calculate the charging time required for a UPS battery bank.
I have a 260 Amp/hr battery bank (120VDC - sealed lead acid type) connected to a 6 ohm, 2.5KW resistor bank for 2 hours. This test is used to simulate the maximum foreseeable load and to chart voltage and current of...
