Re: voltage on Neutral line, Measurements From Chile
Wow! What kind of three-phase power is this - delta or wye? Is this an example of the neutral conductor not being grounded, and just being a tap on a transformer? On Mon, 28 Jun 1999 17:10:42 -0700, Donald Kimball dkimb...@qualcomm.com wrote: At 12:08 AM 6/29/99 -0700, mvald...@netvision.net.il wrote: What voltages can I expect on the Neutral (referenced to ground) line in various countries and connection systems? Is there a limit on how high the voltage may be, both in normal and fault conditions? Some of our Cellular base stations are located in regions of Chile where power is being intentionally turned off due to low water conditions at hydro-electric plants. We have been montoring the voltage at these sites due to concerns about the battery backup system. The cell sites use 380V Line to Line, 220V Line to Neutral, 3-Phase power. During restoration of power, the voltage on neutral sometimes rises to 220V Line to Ground for several cycles. The voltage on the phases has been measured as great as 440V Line to Line for several cycles, with Line to Neutral voltages as high as 380V. There does not seem to be much power available during this transition time with the wild voltages. Preliminary measurements in Brazil are showing some of the same results. The load regulation at remote sites seems to be a problem. Don Kimball thanks in advance, Moshe Name: moshe valdman E-mail: mvald...@netvision.net.il Phone: 972-54-881334 Telefax: 972-3-5496369 Date: 29/6/99 Time: 0:08:41 -- Patrick Lawler plaw...@west.net - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: voltage on Neutral line, Measurements From Chile
At 12:08 AM 6/29/99 -0700, mvald...@netvision.net.il wrote: Hello everyone, What voltages can I expect on the Neutral (referenced to ground) line in various countries and connection systems? Is there a limit on how high the voltage may be, both in normal and fault conditions? Some of our Cellular base stations are located in regions of Chile where power is being intentionally turned off due to low water conditions at hydro-electric plants. We have been montoring the voltage at these sites due to concerns about the battery backup system. The cell sites use 380V Line to Line, 220V Line to Neutral, 3-Phase power. During restoration of power, the voltage on neutral sometimes rises to 220V Line to Ground for several cycles. The voltage on the phases has been measured as great as 440V Line to Line for several cycles, with Line to Neutral voltages as high as 380V. There does not seem to be much power available during this transition time with the wild voltages. Preliminary measurements in Brazil are showing some of the same results. The load regulation at remote sites seems to be a problem. Don Kimball thanks in advance, Moshe Name: moshe valdman E-mail: mvald...@netvision.net.il Phone: 972-54-881334 Telefax: 972-3-5496369 Date: 29/6/99 Time: 0:08:41 - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
