Impulse Current Measuring Shunt

Tubular Shunt ICMS DR. STRAUSS

DR. STRAUSS MESSTECHNIK GMBH, D-96163 Gundelsheim / Bamberg, Tel. +49 951 94 20 60-0 Fax +49 951 94 20 60-9

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.

Technical Data rated values Type ICMS

20 ICMS

10 ICMS

2.5 ICMS

1 ICMS

02*

Nenn-Impulsstrom 8/20 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 s 60

Spannungsabfall max. Voltage drop max. Vpeak 1000

Schutzfunkenstrecke Protection spheregap mm / kV 0,2 mm / approx. 1,5 - 2 kV

Temperaturkoeffizient Temperature coefficient 1 / K < 100·10-6

Messanschluß Measuring socket N-type

Abmessungen ca. Dimensions approx. mm 120 ... 360 x 260 x 50

Masse Weight kg 1,2

Anschluß Connection mm 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.

HV TECHNOLOGIES, Inc.USA Distributor:

Tel: +1-703-365-2330 hvsales@hvtechnologies.com

www.hvtechnologies.com

Impulse Current Measuring Shunt

Tubular Shunt ICMS DR. STRAUSS

DR. STRAUSS MESSTECHNIK GMBH, D-96163 Gundelsheim / Bamberg, Tel. +49 951 94 20 60-0 Fax +49 951 94 20 60-9

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 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.

To avoid overload calculate always the applied energy and refer to the ICMS Derating diagram:

Derating ICMS

0,0001

0,001

0,01

0,1

1

10

0 0,01 0,03 0,1 0,3 1 3 10 30 100

impulse duration [ms], max. pulse repetition rate 1 second

current ratio

I-peak / I-nominal

8/20µs

250/2500µs

AC, DC

4/10µs

TR-AS® and WinTR-AS® are registered Trademarks of DR. STRAUSS. Technical data and design subject to change without notice. Alternative design on request.

0 20 .0ns 40 .0ns 60 .0ns 80 .0ns 100ns 120ns 140ns0-20 .0ns

TB1=2000 .00MS/s

0 20 .0ns 40 .0ns 60 .0ns 80 .0ns 100ns 120ns 140ns0-20 .0ns

TB1=2000 .00MS/s

ICM S 10 S /N 20101

tm in

C H 7 R esp g (t)

ts tm in

C H 8 R esp T(t)

C H 9 T(t)+0 .02 t

C H 10T(t)-0 .02 t

N o .: 3 00 5 6

C H 7 No . 3 0 0 5 6

U o = 5 0 0 V

U r= 5 0 0 .8 V

F i= U r /Uo = 1 .0 0 1 6

R AT 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

T N = 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 = 0 .0 3 µ s

tm a x= 5 µ s

acc. to IEC 60 -2

C H 8 No . 3 0 0 5 6

C H 9 No . 3 0 0 5 6

C H 1 0 N o . 3 0 0 5 6

HV TECHNOLOGIES, Inc.USA Distributor:

Tel: +1-703-365-2330 hvsales@hvtechnologies.com

www.hvtechnologies.com

Impulse Current Measuring Shunt

ICMS 20 – 10 – 2,5 – 1 kA DR. STRAUSS

DR. STRAUSS MESSTECHNIK GMBH, D-96163 Gundelsheim / Bamberg, Tel. +49 951 94 20 60-0 Fax +49 951 94 20 60-9

Test and Calibration Report

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

Type / rated values ICMS 5 5 kA / 0.1 Ohm

Serial-No.: 20 103

Resistance (23°C ± 5K)

Digital Multimeter Solartron 7150 S/N306783, uncertainty tracing back to National Standards 0.01%

Constant Current Source SSG 200 : output ± 200 mA, uncertainty ± 0.1%

0.0764 Ω ± 0.5%

Stempel Seal

Datum Date

20.08.2009

Leiter Qualitätssicherung Head of Quality Control

Dipl-Ing.(FH) Torsten Piehl

N-socket for measuring cable Ground connection

Ø 12,5 mm

Impulse current connection Ø 12,5 mm

Protective spheregap

HV TECHNOLOGIES, Inc.USA Distributor:

Tel: +1-703-365-2330 hvsales@hvtechnologies.com

www.hvtechnologies.com

Impulse Current Measuring Shunt

ICMS 20 – 10 – 2,5 – 1 kA DR. STRAUSS

DR. STRAUSS MESSTECHNIK GMBH, D-96163 Gundelsheim / Bamberg, Tel. +49 951 94 20 60-0 Fax +49 951 94 20 60-9

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.

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.

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 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.

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-noise-ratio 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.

0 20.0ns 40.0ns 60.0ns 80.0ns 100ns 120ns 140ns0-20.0ns

TB1=2000.00MS/s

0 20.0ns 40.0ns 60.0ns 80.0ns 100ns 120ns 140ns0-20.0ns

TB1=2000.00MS/s

actual :

0%

10%

30%

50%

70%

90%

100%

tmin

K7 g(t)

ts tmin

K8 T(t)

K9

Nr.: 32579

K7 Nr. 32566Uo= 500V

Ur= 498.3V

Fi=Ur/Uo= 0.9966

RATIO= 1337.4873

Ub= 507V

B= 1.7%

Tr= 0.0134µs

To= 0.1007nsTa= 8.6289ns

TN= 8.6556ns

T= 8.6556nsts= 0.016µs

nominal epoch

tmin= 0.04µs

tmax= 1µs

acc. to IEC 60-2

K8 Nr. 32566

K9 Nr. 32566

HV TECHNOLOGIES, Inc.USA Distributor:

Tel: +1-703-365-2330 hvsales@hvtechnologies.com

www.hvtechnologies.com