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© OMICRON 2010 of 17

Content

1

Introduction........................................................................................................................................... 4

2 Recommended Connection Methods................................................................................................. 4

2.1 For CTs in Windings; Ratio Error 0.062 %............................................................................... 4

2.2 For CTs in the Feeding Line of a Winding; Ratio Error 0.037 % ............................................. 5

2.3 For CTs in a Winding; Ratio Error 0.077 % ............................................................................. 6

3 Less Optimal Connection Methods and Corresponding Errors...................................................... 7

3.1 Connection Methods for CTs in Windings................................................................................ 7

3.1.1 Measurement in Winding; Ratio Error 0.064 %...................................................... ..................... 7



3.1.4

Measurement in Winding; Ratio Error 0.098 %...................................................... ..................... 8


3.1.6 Measurement in Winding; Ratio Error 0.13 %....... ............................................................ .......... 9

3.1.7 Measurement in Winding; Ratio Error 0.24 %............. ....................................................... ....... 10

3.1.8 Measurement in Winding; Ratio Error 2 %.................. ....................................................... ....... 10

3.1.9 Measurement in Winding; Ratio Error 4.035 %......................................................... ................ 11

3.2 Connection Methods for CTs in the Feeding Line of a Winding............................................ 12

3.2.1 Measurement in the Feeding Line of a Winding; Ratio Error 0.035 %.......................... ............ 12




3.2.5

Measurement in the Feeding Line of a Winding; Ratio Error 0.052 %.......................... ............ 14


3.2.7 Measurement in the Feeding Line of a Winding; Ratio Error 1.35 %............................ ............ 15

3.2.8 Measurement in the Feeding Line of a Winding; Ratio Error 1.35 %............................ ............ 15

3.3 Connection Methods for CTs in a Winding............................................................................ 16

3.3.1 Measurement in a Winding; Ratio Error 4.080 % ...................................................... ............... 16




Please use this note only in combination with the related product manual which contains severalimportant safety instructions. The user is responsible for every application that makes use of anOMICRON 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, opticalcharacter 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 technicalstatus 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 entirelyreliable. 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. Anytranslation 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.




2.2 For CTs in the Feeding Line of a Winding; Ratio Error 0.037 %

Here, only two parallel transformer windings are connected in series to the CT. This connectionmethod provides least possible influence to the measurement result for Rct. The star winding and theremaining windings of the transformer's delta winding are short-circuited to avoid influence of thecore flux to the measurement.




2.3 For CTs in a Winding; Ratio Error 0.077 %

For this measurement, it is essential to select a delta compensation of Ratio 2/3 in the CT-Object card of the CT Analyzer .

One transformer winding is connected in series to the CT. This connection method provides leastpossible influence to the measurement result for Rct. The star winding and the remaining windings ofthe transformer's delta winding are short-circuited to avoid influence of the core flux to themeasurement.




3 Less Optimal Connection Methods and Corresponding Errors

3.1 Connection Methods for CTs in Windings

3.1.1 Measurement in Winding; Ratio Error 0.064 %






3.1.8 Measurement in Winding; Ratio Error 2 %




3.2 Connection Methods for CTs in the Feeding Line of a Winding

3.2.1 Measurement in the Feeding Line of a Winding; Ratio Error 0.035 %





3.3 Connection Methods for CTs in a Winding

3.3.1 Measurement in a Winding; Ratio Error 4.080 %

Select a delta compensation of Ratio 2/3 in the CT-Object card of the CT Analyzer for thismeasurement.



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]

Asia-Pacific

OMICRON electronics Asia Limited

Suite 2006, 20/F, Tower 2

The Gateway, Harbour City

Kowloon, Hong Kong S.A.R.

Phone: +852 2634 0377

Fax: +852 2634 0390

[email protected]

Americas

OMICRON electronics Corp. USA

12 Greenway Plaza, Suite 1510

Houston, TX 77046, USA

Phone: +1 713 830-4660

+1 800-OMICRON

Fax: +1 713 830-4661

[email protected]

For addresses of OMICRON offices with customer servicecenters regional sales offices or offices for training

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