Technical data

33
©
FuG Elektronik GmbH, D-83135 Schechen, Am Eschengrund 11
http://www.fug-elektronik.de, E-Mail: [e-mail]
V 0913
Power supplies for superconducting coils
Series NTS to 65 V / to 10000 A
Features:
 High efficiency
 Short circuit proof and with
unlimited operation at full
current in short-circuit condi-
tion
 Sense terminals for the com-
pensation of the voltage drop
on the power lines. By pre-
setting the voltage, a linear
current ramp can be generat-
ed
 Energizing and de-energizing
voltage can be preset with a
single potentiometer
 Constant voltage operation for
linear up and down control
 Linear de-energization, with
reverse voltage permitted up
to the nominal value of the
output voltage (2-quadrant
operation)
 Interlock loop to monitor the
external load and internal loop
as a standard
Function:
Designed specifically for super-
conducting coil applications.
This power supply family is
series regulated, via a set of
parallel transistors, which are
driven from a pre-regulation
stage which utilises phase
controlled thyristors. In this
manner, the power lost across
the output transistors is kept to
minimum. Thus, the final con-
trol element always has a low
power dissipation in energizing
and static constant current
mode.
In de-energizing mode, the
transistor stage is working as a
current sink and the power is
dissipated by means of either
air or water cooling.
Cooling:
Up to approx. 1000A (or ap-
prox. 5kW de-energizing pow-
er), air cooling. For higher cur-
rents, or higher powers, water
cooling.
Design:
 Up to 200A (or approx. 2.5
kW) in 19’’ table-top cases or
plug-in units.
 Units with higher current or
power are supplied as 19"
cabinets on roller blades. The
side panels can be removed,
the rear door can be locked.
 All cabinets have removable
crane-eyes.
Output:
 Output isolation:
The output is floating. Operat-
ing voltage with respect to
earth: for air cooled units max.
±300V DC, for water cooled
units max. ±100V DC.
 Output terminals:
Up to 100A, clamps on the
rear. For higher currents we
use copper bars.
Technical Data:
 Mains connection:
Up to 1400W nominal power:
230V ±10% 47Hz to 53Hz
For 2800W and higher:
400V ±10% 47Hz to 53Hz,
two-phase
For 700W and higher:
400V ±10% 47Hz to 53Hz,
three-phase
 Ambient temperature:
0°C to +40°C
All following data are guide
values and will be modified
according to the specification.
(For explanations please refer to
Definitions and Terms )
 Setting range for current:
from approx. 0,1% to 100%
 Setting range for voltage:
from -100% to +100%
 Setting resolution:
±1 x 10
-4
to ±1 x 10-
6
 Residual ripple (Voltage 0-
20MHz):
approx. 1 x 10
-3
pp
 Residual ripple (Current 0-
20MHz):
±1 x 10
-4
pp to ±1 x 10
-6
pp
depending on inductivity of the
load
 Run up time:
from 1sec. to 100 hours
 Deviation:
For ±10% mains voltage vari-
ation:
<± 1 x 10
-5
For no load / full load:
<2 x 10
-4
Over 8 hours under constant
conditions:
<±1 x 10
-4
to ±1 x 10
-5
Within the temperature range:
<±1 x 10
-4
to ±5 x 10
-6
/K
Possible Options:
 Analog programming (see
page 44)
 Analog programming, floating
(see page 44)
 DVM with higher resolution
 Computer interfaces - IEEE
488, RS 232, RS 422, Profi-
bus DP, USB, LAN (more on
request) (see page 46)
 Higher stability
 Current control by electronic
ramp with digital control; rise
and fall times are adjustable
manually or via computer
interface
 Current limit setting either
manually or via computer
interface. Resolution up to 1 x
10
-5
for external setting
 High speed turn-off input with
adjustable threshold
 Quench detector to monitor
the magnet
 Fast de-energizing in the
event of quench or mains
failure: A DC circuit breaker or
a semiconductor switch dis-
connects the power supply
from the magnet. De-
energization takes place with
a power resistor, actuated at
quench, or via an external
circuit
 Short circuit switch (Current
source 100mA for heating a
sector of the superconducting
circuit)
 Water cooling
More options and special solu-
tions on request.
For this type of power supplies we don't indicate a range of standard types since it is
meaningful to adapt the power and equipment of the units for each single application.
NTS 250000M - 50
Front plate
Design examples