Abstracts Brochure - CERN

TUPLS138
TUPLS139
TUPLS140
27-Jun-06 16:00 - 18:00 TUPLS — Poster Session
Impacts of Voltage Sags on the Taiwan Light Source
Y.-C. Lin, S.L. Chen, Y.-C. Lin (NTHU) J.-C. Chang, J.-R. Chen, K.C.
Kuo (NSRRC)
262
A voltage sag is a short-duration (typically
0.5 to 30 cycles) reduction in rms voltage
magnitude, usually caused by remote faults
somewhere on the power system. Equip-
ment with digital process controls are often sensitive to voltage sags. Unexpected voltage sags have caused immediate
beam loss several times a year. This paper explores the effects of AC line voltage sags on sensitive equipment operation
in the TLS. The characteristics of the voltage sags experienced by TLS are analyzed. Available solutions to voltage
sags sensitivity problems are also discussed.
Investigation and Analysis of Power Quality in the Taiwan Light Source
Y.-C. Lin, S.L. Chen, Y.-C. Lin (NTHU) J.-C. Chang, J.-R. Chen, K.C.
Kuo (NSRRC)
This paper investigates the electrical power
system quality of the Taiwan Light Source.
The power quality issues, including voltage
sags, power harmonics, three-phase unbal-
ance and voltage fluctuation, are all measured and analyzed. With the increasing use of power conversion and other
non-linear loads in synchrotron radiation facilities, the voltage and current waveforms of utility distribution system
are becoming more distorted and power quality is deteriorating. Newer-generation load equipment, with microprocessor-based
controls and power electronic devices, is more sensitive to power quality variation than equipment
used in the past. The results of the survey will provide a basis for mitigation actions to minimize the effects of power
system disturbances on light source operation.
An Overview of the SNS Accelerator Mechanical Engineering
G.R. Murdoch, J.J. Error, M.P. Hechler, S. Henderson, M. Holding,
T. Hunter, P. Ladd, T.L. Mann, R. Savino, J.P. Schubert (ORNL) H.-
C. Hseuh, H. Ludewig, G.J. Mahler, C. Pai, C. Pearson, J. Rank, J.E.
Tuozzolo, J. Wei (BNL)
The Spallation Neutron Source (SNS) is an
accelerator-based neutron source currently
nearing completion at Oak Ridge National
Laboratory. When completed in 2006, the
SNS will provide a 1GeV, 1.44MW proton
beam to a liquid mercury target for neutron
production. SNS is a collaborative effort between six U.S. Department of Energy national laboratories and offered
a unique opportunity for the mechanical engineers to work with their peers from across the country. This paper
presents an overview of the overall success of the collaboration concentrating on the accelerator ring mechanical engineering
along with some discussion regarding the relative merits of such a collaborative approach. Also presented
are a status of the mechanical engineering installation and a review of the associated installation costs.