Impulse Current Measuring Shunt
Tubular Shunt ICMS
DR. STRAUSS
The Impulse Current Measuring Shunts ICMS are new designed tubular shunt types with best response
behaviour to match the high performance of the TR-AS digital recorder for comparative current
measurements. A 1st partial response time Ta less than 10 ns and a settling time less than 20 ns show
the advantage of these shunts. They show no initial overshoot peak and no oscillations and need no
compensation box to optimize the transient behaviour as known from e.g. cage shunts.
Tubular shunts type ICMS are special designed and can be offered with values up to 0.5 Ohm, they are
therefore ideal for current measurements during transformer tests. The resistance material of the inner
tube show high energy absorption capability and very low temperature coefficient and therefore
negligible non-linearity effect for impulses of different magnitude. This is very important for comparison of
shapes e.g. of 50% and 100% test level during transformer tests. For
ohmic values above 1 Ohm carbon resistors (*) are used.
The Impulse Current Measuring Shunts ICMS are designed for
measurements of impulse currents with shape 8/20 µs according to
IEC 60060-1. For impulse currents with any shape the maximal
action integral or the maximal voltage drop must not be exceeded.
The shunt value is considered in the WinTR-AS software for easy
application. Allow tolerance of the resistance up to ± 25% because of
tolerancies in the resistance material and manufacturing process.
Type
ICMS
20
ICMS
10
ICMS
2.5
ICMS
1
ICMS
02*
rated Impulse current 8/20
A
20 000
10 000
2 500
1 000
250
Dauerstrom AC, DC
cont. current AC, DC
A
20
14
7
4
2
Widerstand (± 25%)
Resistance (± 25%)
Ω
0.025
0.05
0.2
0.5
2
Empfindlichkeit
Sensitivity
V / kA
25
50
200
500
2000
Arbeitsbereich mit TR-AS®
digital recorder
Working Area with TR-AS®
digital recorder
A
≥ 200
≥ 100
≥ 20
≥8
≥2
Anstiegszeit Tr
Rise time Tr
ns
<30
<20
<15
<15
<15
Antwortzeit Ta
Response time Ta
ns
<20
<10
<10
<10
<10
Max. Energieintegral ∫i².dt
max. Action integral ∫i².dt
A²s
18 000
5 000
280
50
100
Minimale Pausezeit
repetitition rate
Spannungsabfall max.
Voltage drop max.
Schutzfunkenstrecke
Protection spheregap
Temperaturkoeffizient
Temperature coefficient
Messanschluß
Measuring socket
Abmessungen ca.
Dimensions approx.
Masse
Weight
Anschluß
Connection
Technical Data
rated values
Nenn-Impulsstrom 8/20
s
Vpeak
mm / kV
1/K
60
1000
0,2 mm / approx. 1,5 - 2 kV
-6
< 100·10
N-type
mm
kg
mm
120 ... 360 x 260 x 50
1,2
12.5 Ø
The inbuilt protection spheregap limits the voltage drop to a value below the max. allowable input voltage
of the connected TR-AS® digital recorder. In case of serious discharge caused by extreme overcurrent
e.g. by flashover of the test object the gap must be cleaned and new adjusted.
The characteristic impedance of the measuring cable connected to the Impulse Current Measuring Shunt
ICMS is recommended to 75 Ω. To avoid reflections on the measuring cable a terminating resistor TERM
75 matching the impedance Z of the measuring cable must be connected to the far end at the input of
the measuring system. Triaxial cable only is recommended.
USA Di
stri
butor:
HV TECHNOLOGIES,Inc.
www.
hvt
echnol
ogi
es.
com
Tel
:+1-703-365-2330
hvsal
es@hvt
echnol
ogi
es.
com
DR. STRAUSS MESSTECHNIK GMBH, D-96163 Gundelsheim / Bamberg, Tel. +49 951 94 20 60-0 Fax +49 951 94 20 60-9
Impulse Current Measuring Shunt
Tubular Shunt ICMS
DR. STRAUSS
The influence of the terminating resistor with value Z connected in parallel to the measuring shunt Rm
with respect to the resulting resistance value R is in most cases negligible, it can be calculated to R =
Rm·Z/(Rm+Z).
Typical Result of STEP Response Measurement of ICMS 10
TB 1 = 2 0 0 0 .0 0 MS /s
IC M S 1 0 S /N 2 0 1 0 1
C H 7 R e sp g (t)
N o .: 3 00 5 6
C H 7 No. 30056
U o=
500V
U r=
5 0 0 .8 V
F i= U r /U o =1 .0 0 1 6
R A T IO = 2 2 4 3 .3 0 1 8
U b=
5 1 2 .8 V
B=
2 .4 %
T r=
0 .0 1 6 µ s
T o=
0 .1 2 6 n s
T a=
9 .7 6 8 1 n s
TN=
9 .7 4 4 8 n s
T=
9 .7 4 4 8 n s
ts =
0 .0 1 7 5 µ s
nom inal epoc h
tm in
-2 0 .0 n s
0
TB 1 = 2 0 0 0 .0 0 MS /s
2 0 .0 n s
4 0 .0 n s
6 0 .0 n s
8 0 .0 n s
100ns
120ns
4 0 n s.0 2 t
C H 9 1T(t)+0
tm in =
tm a x=
0 .0 3 µ s
5µs
C H 8 R e sp T(t)
C H 8 No. 30056
C H 9 No. 30056
C H 1 0 N o .3 0 0 5 6
a cc. to IE C 6 0 -2
C H 1 0 T(t)-0 .0 2 t
ts
-2 0 .0 n s
0
The STEP response
measurement follows by
feeding a steep impulse
step current to the shunt,
the response is measured
with a digital recorder TRAS 200-14 with repetitive
sampling of 2 GHz and
evaluated according to the
parameter method
specified in IEC 60060-1.
tm in
2 0 .0 n s
4 0 .0 n s
6 0 .0 n s
8 0 .0 n s
100ns
120ns
140ns
To avoid overload calculate always the applied energy and refer to the ICMS Derating diagram:
Derating ICMS
current ratio
I-peak / I-nom inal
10
4/10µs
8/20µs
1
0,1
250/2500µs
0,01
AC, DC
0,001
0,0001
0
0,01
0,03
0,1
0,3
1
3
10
30
100
im pulse duration [m s], m ax. pulse repetition rate 1 second
TR-AS® and WinTR-AS® are registered Trademarks of DR. STRAUSS. Technical data and design subject to change without notice. Alternative
design on request.
USA Di
stri
butor:
HV TECHNOLOGIES,Inc.
www.
hvt
echnol
ogi
es.
com
Tel
:+1-703-365-2330
hvsal
es@hvt
echnol
ogi
es.
com
DR. STRAUSS MESSTECHNIK GMBH, D-96163 Gundelsheim / Bamberg, Tel. +49 951 94 20 60-0 Fax +49 951 94 20 60-9
Impulse Current Measuring Shunt
ICMS 20 – 10 – 2,5 – 1 kA
DR. STRAUSS
Test and Calibration Report
Impulse current connection Ø 12,5 mm
Protective spheregap
N-socket for
measuring cable
Ground connection
Ø 12,5 mm
Dimensions: 360 x 260 x 50 mm (approx.)
Calibration procedure :
The shunt resistance is determined by feeding a constant current between impulse and ground
connection and measuring the voltage drop at the measuring connector.
Quality Control – Calibration Result:
Customer / Order
ICMS 5
Type / rated values
5 kA / 0.1 Ohm
20 103
Serial-No.:
Resistance (23°C ± 5K)
Digital Multimeter Solartron 7150 S/N306783, uncertainty tracing back to
National Standards 0.01%
0.0764 Ω ± 0.5%
Constant Current Source SSG 200 : output ± 200 mA, uncertainty ± 0.1%
Stempel
Seal
Datum
Date
Leiter Qualitätssicherung
Head of Quality Control
20.08.2009
Dipl-Ing.(FH) Torsten Piehl
USA Di
stri
butor:
HV TECHNOLOGIES,Inc.
www.
hvt
echnol
ogi
es.
com
hvsal
es@h
vt
echnol
o
gi
es+49
.
com951 94 20 60-0 Fax +49 951 94 20 60-9
Tel
:+1-70
3-365-2
330
GMBH,
D-96163
Gundelsheim
/ Bamberg,
Tel.
DR. STRAUSS MESSTECHNIK
Impulse Current Measuring Shunt
ICMS 20 – 10 – 2,5 – 1 kA
TB1=2000.00MS/s
actual :
100%
K7 g(t)
90%
70%
50%
30%
10%
0%
Nr.: 32579
K7 Nr. 32566
Uo=
500V
Ur=
498.3V
Fi=Ur/Uo=0.9966
RATIO= 1337.4873
Ub=
507V
B=
1.7%
Tr=
0.0134µs
To=
0.1007ns
Ta=
8.6289ns
TN=
8.6556ns
T=
8.6556ns
ts=
0.016µs
nominal epoch
tmin
-20.0ns
0
TB1=2000.00MS/s
20.0ns
40.0ns
60.0ns
80.0ns
100ns
120ns
140nsK9
K8 T(t)
tmin=
tmax=
0.04µs
1µs
DR. STRAUSS
STEP Response Measurement
ICMS20103
The STEP response measurement follows by feeding a steep
impulse step current to the shunt, the response is measured
with a digital recorder TR-AS 200-14 with repetitive sampling
of 2 GHz and evaluated according to the parameter method
specified in IEC 60060-1.
acc. to IEC 60-2
K8 Nr.
K9 Nr.
32566
32566
Application Information:
The characteristic impedance of the measuring cable
connected to the Impulse Current Measuring Shunt ICMS 20
can be 50 Ω or 75 Ω, it is not critical. To avoid reflections on
the measuring cable a terminating resistor TERM 50 or TERM
75 matching the impedance Z of the measuring cable must be connected to the far end at the input of the measuring system.
Triaxial cable is suggested.
ts
-20.0ns
0
20.0ns
tmin
40.0ns
60.0ns
80.0ns
100ns
120ns
140ns
The influence of the terminating resistor with value Z connected in parallel to the measuring shunt Rm with respect to the
resulting resistance value R is in most cases negligible, it can be calculated to R = Rm·Z/(Rm+Z).
The inbuilt protection spheregap limits the voltage drop to a value below the max. allowable input voltage of the connected TRAS® digital recorder. In case of serious discharge caused by extreme overcurrent e.g. by flashover of the test object the gap
must be cleaned and new adjusted.
CAUTION:
The Impulse Measuring Shunts are forseen for laboratory use by qualified personal only.
Connect only while dead. Do not remove covers. Refer servicing to qualified personal.
A missing earth connection might endanger personal and cause faults on measuring equipment!
Do not overload the ICMS, calculate always the applied energy and refere to the respective
derating diagram, too. Heavy overload may damage the resistive material inside irrevocable.
The test voltage applied and
measured with the i.v.
divider is influenced by the
voltage drop of the impulse
current measuring shunt
ICMS.
In case this voltage drop is
inside the optimal range of
100 Volts up to max. 1000 V
for an optimal signal-noiseratio the influence is for
higher test voltages
negligible.
TR-AS® and WinTR-AS® are registered Trademarks of DR. STRAUSS. Technical data and design subject to change without notice. Alternative
design on request.
USA Di
stri
butor:
HV TECHNOLOGIES,Inc.
www.
hvt
echnol
ogi
es.
com
Tel
:+1-703-365-2330
hvsal
es@hvt
echnol
ogi
es.
com
DR. STRAUSS MESSTECHNIK GMBH, D-96163 Gundelsheim / Bamberg, Tel. +49 951 94 20 60-0 Fax +49 951 94 20 60-9