72pt;">From:   Tim McGinnis

Date:
  20 March 2002

To:
  Power Group

Subject:
 Minutes of Telecon, 4 February 2002

Present were: Denise Dennis, Mohamed El-Sharkawi, Harold Kirkham,
Chen-Ching Liu, Tim McGinnis, Byung Ki Park, Kevin Schneider, Aditya
Upadhye, Vatché Vorpérian.

Mohamed pointed out that the main backbone breakers never open or
close onto 10kV it will always be either a lower voltage, a section
of cable that is charged, or a section of cable that is floating (a
capacitor with a charge of zero?). For this reason the breaker circuit
may be simplified. Harold pointed out that it needs the resistor to
limit the in-rush current.

Denise presented
some initial high voltage capacitor information for the relay circuit.
A 10 f capacitor is about 12 long, 60 in<sup>3
and would result in a switching transient of about 12 kV that was relatively
broad. A 1 f capacitor is about 6 long, 20 in<sup>3 and would
result in a switching transient that was about 14 kV and relatively
narrow.

Discussed the
need for over voltage capacity, possibly 20 kV diodes and the possibility
of the need for surge arrestors.

Mohamed and Aditya
will model the breaker/diode circuit to look at the transients.

Chen-Ching sent
out a brief paper on the shore station power control to Harold and Bruce.
When he gets the comments back, he will send out to the group.

Discussed the
preliminary indication of a ~1ms latency in the Gigabit Ethernet (GbE)
and the fact that that is probably acceptable for the current differential
monitoring.

Discussed the
~1 minute boot time of the GbE and the fact that that is not acceptable
for the voltage and current monitoring.

Discussed the
possible options for implementing the backbone Ts. Kevin will use
his model to look at the power levels if the T off Oregon were lost.

Tim mentioned
that we have a new node topology from the recently completed desktop
study. It will definitely change again so it is probably not worth changing
any of the models but people should be aware of the fact that nodes
have been added.