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Internal Damped Capacitive Impulse Voltage Divider0 pages
Damped-Capacitive Impulse Divider
Type CR
Application
Design
The damped-capacitive impulse voltage dividers
series CR can be used to measure full lightning
impulse voltages, tail chopped impulse voltages,
switching impulses and AC voltages.
Depending on the voltage rating, the high voltage part of
the dividers consists of one or several oil-filled capacitors
which are housed in cylinders made from glass fibre
reinforced epoxy resin. The damping resistance is
inserted between the capacitor elements of the unit and
acts as distributed internal resistive element. External
damping resistances are used also above 1600 kV
(included).
Above 1000 kV (included) the dividers are equipped with
toroidal HV electrodes to guarantee discharge-free
operation. The electrode is designed depending of the
rated L.I. and negative S.I. levels.
The secondary unit consists of a capacitor and a damping
resistor of low inductance both arranged in a coaxial
design. The unit is fixed at the bottom of the divider and
can easily be exchanged.
The voltage divider is erected on a four-arm base
equipped with castors. It is designed for indoor design.
They meet all requirements of IEC 60060-2 (1994),
in particular those with respect to measuring
accuracy and step response. Furthermore, all HV
tests are carried out in accordance to the applicable
IEC 60060-2 requirements (up to the limits imposed
by our test system & premises). They can be used
as a basic load for impulse voltage generators.
The type designation consists of the characters CR
and two figures, e.g. CR 1200-700. The first figure
indicated the rated L.I. voltage in kV, the second the
primary capacitance in pF.
Technical Data
Type
Rated neg.
impulse
voltage S.I.
250/2500 µs
kV
CR 600-1050
Rated
impulse
voltage L.I.
1.2/50 µs
kV
600
500
Rated RMS CapaciAC voltage, tance
50/60 Hz,
cont. duty
*
kV
pF
Damping
res. int.
Damping
res. ext.
Ω
Ω
200
1050
120
--
CR 800-1050
800
650
200
1050
120
--
CR 1000-700
1000
850
300
700
180
--
CR 1200-700
1200
850
300
700
180
--
CR 1600-525
1600
1300
400
525
240
150
CR 2000-420
2000
1650
500
420
300
150
CR 2400-350
2400
2000
600
350
360
150
CR 2800-300
2800
2300
700
300
420
150
CR 3000-263
3000
2650
800
263
480
150
CR 3200-263
3200
2650
800
263
480
150
CR 3600-400
3600
3000
900
400
360
350
CR 4000-360
4000
3300
1000
360
400
350
* with adequate additional secondary part for AC voltage measurements type SEK W.
CR 4000-360 divider
Other ratings & positive S.I. level on request. The top electrode can be designed to
reach higher S.I. levels.
