Etap Knowledge Base: Transformer Ansi Curve Shift

ETAP Knowledge Base

Transformer ANSI Curve Shift Description: Shifting Transformers Damage Curves Category:

STAR, Overcurrent Protection of Transformers, Short-Circuit

Type:

Modeling, Calculation

Keywords:

Transformer Curve Shift, Damage Curve, Protection, Curve-Piecewise, CurveEquation

Q. Does ETAP allow curve shift for transformer in STAR view. A. The ANSI curve shift is applied as a multiplier to the current (horizontal axis) components of the entire transformer damage curve. The curve shift is dependent upon the connection specified in the Grounding page of the Transformer Editor. The table below describes this relationship:

However, if you still want to shift the curve, you can either shift the protective device curves or the transformer curve through Plot Options by the following steps: 1. Right click on the curve you wish to shift.

This document is confidential and proprietary to Operation Technology, Inc. and may not be reproduced, published or disclosed to others without the written authorization of Operation Technology, Inc., 17 Goodyear, Suite 100, Irvine, CA 92618, USA. © 2010 by Operation Technology, Inc. All Rights Reserved.

© Operation Technology, Inc.

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Transformer ANSI Curve Shift

2. Select Plot Options. The Plot Option dialog will open. 3. Under Preferences, enter the shift factor.

This document is confidential and proprietary to Operation Technology, Inc. and may not be reproduced, published or disclosed to others without the written authorization of Operation Technology, Inc., 17 Goodyear, Suite 100, Irvine, CA 92618, USA. © 2010 by Operation Technology, Inc. All Rights Reserved.

© Operation Technology, Inc.

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Transformer ANSI Curve Shift

4. Click OK. The curve will now be displayed with the shift being applied.

This document is confidential and proprietary to Operation Technology, Inc. and may not be reproduced, published or disclosed to others without the written authorization of Operation Technology, Inc., 17 Goodyear, Suite 100, Irvine, CA 92618, USA. © 2010 by Operation Technology, Inc. All Rights Reserved.

© Operation Technology, Inc.

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