Peter, My father worked for the electric utility for many years. There were times he could take me with him to check on how a substation was working after some maintenance or upgrade was performed. From direct experience I can tell you that when you enter the substation building, you can quite often feel and smell the electricity in the air. The electrostatic fields that build up in these environments can be substantial. Yes, everything inside is well grounded, but when you have thousands of volts running around big copper bus bars, switching systems, transformers, etc. you hear the hum and feel the electricity in the air. Back then, I thought it was really neat as I did not have the healthy respect that I have since acquired the hard way.
One other thought here, would you want your TV going blink just at the end of the local cricket match or the last quarter of the World Cup "football" game? That could happen if some protective device or overcurrent sensor got zapped and caused a shutdown when there was really no system problem requiring a shutdown. Scott [email protected] [email protected] writes: >Hi. > >I've recently been shown a standard published by a European group called >UNIPEDE titled "Automation and Control Apparatus for Generating Stations >and Substations - Electromagnetic Compatibility Immunity Requirements" - >Ref# 23005Ren9523. > >This standard generally adheres to the same requirements for immunity as >the CE-mark standards, however for ESD it requires 8kV contact and 15kV >air >for HV substation environments. As is usually the case, there's no >rationale provided as to why these levels where chosen (something that >really annoys me about most standards). > >Does anyone have suggestions as to why the authors of the standard would >expect worse ESD conditions in a substation than they seem to expect in an >air conditioned, carpeted office? (equipment in environments other than HV >substations only need meet 6kV contact, 8kV air according to this >standard) > > > >------------------------------------------------------------------------- >Please note: The views, opinions and information expressed and/or >contained herein do not necessarily reflect the opinions or views of >Foxboro, the organisation/s through which this communication was >transmitted >nor any other third party, unless explicitly stated so. > >Peter Poulos (Hardware Design Engineer) >Foxboro Australia >42 McKechnie Drive, Eight Mile Plains, QLD, Australia 4113 >Tel:+61 (07) 3340 2118 Fax: +61 (07) 3340 2100 >E-mail:[email protected] --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
