cpc-100-anp-10027-enu

Application Note

Testing with higher currents

Author Markus Ptter | [email protected] Date 2008

Related OMICRON Product CPC 100, CP CB2

Keywords CPC 100, CP CB2

Version v1.0

Document ID ANP_10027_ENU

OMICRON Page 1 of 9

Content

1 Purpose ................................................................................................................................................. 3 1.1 Introduction .................................................................................................................................... 3 1.2 Safety Instructions ......................................................................................................................... 3

2 Test Setup ............................................................................................................................................. 4 2.1 Current Ranges ............................................................................................................................. 4

2.1.1 Currents from 500 to 2000 A ............................................................................................................. 4 2.1.2 Currents from ~2000 to ~4500 A in Range 1 .................................................................................... 5 2.1.3 Currents from ~3500 to ~5000 A in Range 2 .................................................................................... 6 2.1.4 Currents from ~3500 to ~5000 A in Range 1 .................................................................................... 7 2.1.5 Currents from ~4000 to ~7000 A in Range 2 .................................................................................... 8

Please use this note only in combination with the related product manual which contains several important safety instructions. The user is responsible for every application that makes use of an OMICRON product. OMICRON electronics GmbH including all international branch offices is henceforth referred to as OMICRON. OMICRON 2010. All rights reserved. This application note is a publication of OMICRON.

All rights including translation reserved. Reproduction of any kind, for example, photocopying, microfilming, optical character recognition and/or storage in electronic data processing systems, requires the explicit consent of OMICRON. Reprinting, wholly or in part, is not permitted.

The product information, specifications, and technical data embodied in this application note represent the technical status at the time of writing and are subject to change without prior notice.

We have done our best to ensure that the information given in this application note is useful, accurate and entirely reliable. However, OMICRON does not assume responsibility for any inaccuracies which may be present. OMICRON translates this application note from the source language English into a number of other languages. Any translation of this document is done for local requirements, and in the event of a dispute between the English and a non-English version, the English version of this note shall govern.

OMICRON 2010 Page 2 of 9

1 Purpose This application note describes how to make the test setup to generate currents up to 7000 A with one CPC 100 and 3 CP CB2 current boosters.

1.1 Introduction With the CPC 100 and the CP CB2 current booster you can generate currents up to 2000 A. Somet

currents above 2000 A. imes it

is required to generate more current for example to test CT's with nominalith 3 CP CB2 current boosters it is possible to power out up to 7000 A. W

1.2 Safety Instructions rting the test the CPC 100, the CPC booster box and the 3 current boosters must be grounded

roperly.

close to the DUT (Device Under Test). Take care that they are ounted safely and cannot fall down.

efore do not exceed the test time longer than 15 seconds to avoid the destruction of

e current boosters.

ure CT's, all other secondary terminals must be short circuited to avoid high voltages on the rminals.

Before stap The current boosters must be mountedm Operating the test with "RANGE 2" means that the CP CB2(1) and CP CB2(2) are connected to 400 V AC on the primary side. The supply voltage for each current booster is therefore 200 V, which is more than theyare specified for. Therth If you measte


2 Test Setup One CP CB2 is controlled through the CPC 100. This is the only current booster where you can adjust the current. The second current booster - CP CB2(1) - and the third - CP CB2(2) - are connected to the CPC Booster Box. The output current of these boosters depends on the load and the supply voltage. The supply voltage can be 240 V (Range 1 phase to N) and 415 V (Range 2 phase to phase). You can connect one booster, two boosters or three boosters in parallel to the DUT. Because you do not know the primary injected current you need a reference CT (Ref CT) to measure it. The CPC Booster Box must be supplied with a three-phase system inclusive neutral and at least 32 A. Note: Due to the high current also on the primary side of the CP CB2 it sometimes occurs that the fuse in the CPC Booster Box trips. By the factory tests the maximum current could only powered out for 5-10 seconds.

2.1 Current Ranges The current ranges depend on the connection and the connected load and can therefore not be

The following current ranges are reference values which were determined during tests in guaranteed.boratory. la

2.1.1 Currents from 500 to 2000 A

For this range you can use only the CPC 100 together with the CP CB2. The CPC Booster Box is witched off. s


2.1.2 Currents from ~2000 to ~4500 A in Range 1

The supply voltage to the current boosters CP CB2(1) and CP CB2(2) is 240 V. CP CB2(1) is connected in parallel with the CP CB2 of the CPC 100 to the DUT. The CP CB2(2) must be short circuit. Range 1: 2000 to 4500 A Test setup: > Switch to Range 1 (CPC Booster Box) > Connect the current boosters to the CPC Booster Box and CPC 100 and make all connections

according to the diagram below > Connect the Ref CT to the I AC input of the CPC 100 > Configure the Ref CT at the CPC (Option view Device Setup Clamp & input transformer settings

CT) > Use a Quick Card and select the output range "CB2 2000 A". Select "Sync to V1 AC" and for the

measurement select "I out" and "CT" > Connect the secondary side of the DUT to an additional ammeter Executing the test: > Switch on the CPC Booster Box and read the actual primary current on the CPC 100 (Measurement

"CT") > Switch off. > If you need more current add the additional current with the CPC 100. > First switch on the CPC Booster Box and then the CPC 100. Now read the actual primary current

(Measurement "CT") and set your primary current with the CPC 100 to the requested value. > Read the secondary current of the DUT at the ammeter > Calculate the ratio


2.1.3 Currents from ~3500 to ~5000 A in Range 2 The supply voltage to the current boosters CP CB2(1) and CP CB2(2) is 420 V. CP CB2(1) is connected in parallel with the CP CB2 of the CPC 100 to the DUT. The CP CB2(2) must be short circuit. Range 2: 3500 to 5000 A Test setup: > Switch to Range 2 (CPC Booster Box) > Connect the current boosters to the CPC Booster Box and CPC 100 and make all connections



measurement select "I out" and "CT" > Connect the secondary side of the DUT to an additional ammeter Executing the test: !!!To avoid the destruction of the current boosters do not switch on longer than 15 sec!!! > Switch on the CPC Booster Box and read the actual primary current on the CPC100

(Measurement "CT") > Switch off. > If you need more current add the additional current with the CPC 100. > First switch on the CPC Booster Box and then the CPC 100. Now read the actual primary current

(Measurement "CT") and set your primary current with the CPC 100 to the requested value. > Read the secondary current of the DUT at the ammeter > Calculate the ratio > Test finished



The supply voltage to the current boosters CP CB2(1) and CP CB2(2) is 240 V. CP CB2(1) and CP CB2(2) is connected in parallel with the CP CB2 of the CPC 100 to the DUT. Range 1: 3500 to 5000 A Test setup: > Switch to Range 1 (CPC Booster Box) > Connect the current boosters to the CPC Booster Box and CPC 100 and make all connections



measurement select "I out" and "CT" > Connect the secondary side of the DUT to an additional ammeter Executing the test: > Switch on the CPC Booster Box and read the actual primary current on the CPC 100 (Measurement

"CT") > Switch off. > If you need more current add the additional current with the CPC 100. > First switch on the CPC Booster Box and then the CPC 100. Now read the actual primary current





The supply voltage to the current boosters CP CB2(1) and CP CB2(2) is 420V. CP CB2(1) and CP CB2(2) is connected in parallel with the CP CB2 of the CPC 100 to the DUT. Range 2: 4000 to 7000 A Test setup: > Switch to Range 2 (CPC Booster Box) > Connect the current boosters to the CPC Booster Box and CPC 100 and make all connections



measurement select "I out" and "CT" > Connect the secondary side of the DUT to an additional ammeter Executing the test: !!!To avoid the destruction of the current boosters do not switch on longer than 10 sec!!! > Switch on the CPC Booster Box and read the actual primary current on the CPC 100 (Measurement

"CT") > Switch off. > If you need more current add the additional current with the CPC 100. > Switch on first the CPC Booster Box and then the CPC 100 and read the actual primary current


OMICRON is an international company serving the electrical power industry with innovative testing and diagnostic solutions. The application of OMICRON products provides users with the highest level of confidence in the condition assessment of primary and secondary equipment on their systems. Services offered in the area of consulting, commissioning, testing, diagnosis, and training make the product range complete.

Customers in more than 130 countries rely on the company's ability to supply leading edge technology of excellent quality. Broad application knowledge and extraordinary customer support provided by offices in North America, Europe, South and East Asia, and the Middle East, together with a worldwide network of distributors and representatives, make the company a market leader in its sector.

Europe, Middle East, Africa OMICRON electronics GmbH Oberes Ried 1 6833 Klaus, Austria Phone: +43 5523 507-0 Fax: +43 5523 507-999 [email protected]

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For addresses of OMICRON offices with customer service centers, regional sales offices or offices for training, consulting and commissioning please visit our web site. www.omicron.at y www.omicronusa.com

1 Purpose1.1 Introduction1.2 Safety Instructions

2 Test Setup2.1 Current Ranges2.1.1 Currents from 500 to 2000 A2.1.2 Currents from ~2000 to ~4500 A in Range 12.1.3 Currents from ~3500 to ~5000 A in Range 2 2.1.4 Currents from ~3500 to ~5000 A in Range 12.1.5 Currents from ~4000 to ~7000 A in Range 2

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