analysis of main disturbances at elettra (a. pozzer)...
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Analysis of main disturbances at Elettra(A. Pozzer)
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Trieste Sinchrotron very sensitive
Voltage Sags
Voltage Peaks
UPS does not for ALL DEVICES
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Analysis on the electric system with instruments “Equa”
BEAM LOSSDisturbances
PS or RF Plants off
What can we do?
Signals acquired by Equa:
-3 phases at 380V rms nominal
-1 E-beam current in SR
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100mS pre-triggers and 900mS post-triggers
exceed the limit
EQUA Parameters set up:
-min voltage rms level 360V
-max voltage rms level 420V
-max voltage peak level 630V
Equa records the event
If one or more phases
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3 phases min rms
E-Beam current SR
starting event voltage Sag
B E A M LOST
A Voltage Sag on three phases caused the lost of beam
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Period June 2004 – August 2005
All the runs since 2000
the events with voltage RMS level
the events with voltage PEAK level
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Events with MIN and/or MAX voltage RMS level
Tot 112 events 32 of them beam loss
Events distribuition in the course of the seasons
eventi da TEMPORALI
0
10
20
30
run (mese di riferimento)
totali beam dump
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events with Beam Loss
eventi da TEMPORALI
0
1
2
3
4
5
6
7
run (mese di riferimento)
n. e
ve
nti
First Consideration: the most difficult period at Elettra is certainly the summer season for the presences of thunderstorms.
summer
summer
summer
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Duration – Depth
a) – events with duration < 200mS 26 events
Voltage Sag
E- Beam current
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These limits have been observed:
Depth event < 10 % No Beam Lost
Depth event > 15% Beam Lost
Depth event 10% < X < 15%
Unstable situation
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b) - events with duration > 200mS
Depth event < 6 % No Beam Lost
Depth event > 6 % Beam Lost
6 events
These limits have been observed:
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1) Duration: 500mS - Depth: 8.20%
E – beam SR
Voltage Sag
BEAM LOSS
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2) Duration: 500mS - Depth: 5.30% NO BEAM LOSS
E – beam current SR
Voltage Sags
Depth Events < 5% are not considered
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Events with MAX voltage PEAK level
Working day in the morning A Voltage Peak
SR in normal condition
E-beam currente SR
Voltage Peak
NO problem
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SR is in a particular condition
But If ...
BEAM LOSS
3 events BEAM LOSS
Alwaysduring the Ramping and with E- Beam current > 300mA
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Voltage Peak
E-beam currente SR
Example:
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Conclusion:
VOLTAGE PEAKS NO big Problems
future? With new Booster?
VOLTAGE SAGSNOT OK - too many Beam Losses
HOPE All Devices
U P S
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References:
Effects of mains disturbances on the Elettra operation (R. Visintini – Accelerator Sector Technical Meeting -May,6th 2002)