From: "Denicolai, Marco"
Date: Wed, 4 Aug 2004 11:21:06 +0300
Subject: [TSSP] Secondary dynamic Efield
Hi Paul, I'm getting acquainted with HV resistive dividers. I tested my first one and got proof of its poor performance. What actually spoiled it was its 10 pf stray capacitance to GND. I got a step response of 30 us (!). Some would say easy to guess for a resistance of 1.2 Mohm. Hanging the divider at 3 m height will sure reduce its capacitance to gnd. That was my original plan. But now I learnt that any discontinuity in the Efield even AROUND its water column will result in unbalanced stray capacitance and, therefore, in slow step response. I'm reluctant to place the divider inside the secondary because it's difficult to mount it and service it there. But there the Efield should be pretty constant. But... Now comes my question. If I recall you and Terry produced some nice dynamic plots of the secondary voltage and current. Wasn't it so that they were varying at the secondary frequency? That would imply not constant dynamic Efield distribution inside the secondary and make the probe placement there definitevely a bad idea. Am I right? Best Regards ----------------------------------------- ============================================================ The information contained in this message may be privileged and confidential and protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any reproduction, dissemination or distribution of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by replying to the message and deleting it from your computer. Thank you. Tellabs ============================================================
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.