Siemens
- Siprotec 5 family, Version 8.30 & higher
ABB
- Relion 670, Version 2.2 IEC _ CT1014
05
Apr
Apr
This post describes the CT requirements for Relion 670 Relays applications.
To see other supported relays, click here.
Rated equivalent secondary e.m.f. requirements
Busbar protection
Distance protection
Breaker failure protection
Transformer differential protection
Restricted earth fault protection (low impedance differential) protection
Non-directional instantaneous and definitive time, phase and residual overcurrent protection
Non-directional inverse time delayed phase and residual overcurrent protection
Generator differential protection
Example 1 – (3 parts)
Example 2 – (3 parts)
Line differential protection
Directional phase & residual overcurrent protection
Current transformer requirements for CTs according to other standards
Current transformers according to IEC 61869-2, class P, PR
Current transformers according to IEC 61869-2, class PX, PXR (and old IEC 60044-6, class TPS and old British Standard, class X)
Current transformers according to ANSI/IEEE
05
Apr
Apr
Phase-Current Transformer
This post describes the CT requirements for Siprotec 5 Relays, Motor Differential Protection (7UT8) applications.
To see other supported relays, click here.
Required Factor
Description
Example 1
05
Apr
Apr
Phase-Current Transformer
This post describes the CT requirements for Siprotec 5 Relays, Generator Differential Protection (7UT8) applications.
To see other supported relays, click here.
Required Factor
Description
Example 1 (Part 1/2)
Example 1 (Part 2/2)
05
Apr
Apr
Phase-Current Transformer and Neutral-Point Transformer
This post describes the CT requirements for Siprotec 5 Relays, Transformer Differential Protection (7UT8) applications.
To see other supported relays, click here.
Required Factor
Description
Example 1
04
Apr
Apr
Phase-Current Transformer
This post describes the CT requirements for Siprotec 5 Relays, Distance, Line Differential & Overcurrent Protection (7SA8, 7SD8, 7SL8, 7SJ8) applications. The specified rules pertaining to the dimensioning apply the definition of protection current transformer found in IEC61869-2 Edition 1.0 (previously IEC 60044-1 and IEC 44-6). Dimension according to ANSI C57.13 is also described.
To see other supported relays, click here.
Parameters Description
Requirements According to IEC 60044-6 for Transformer Type, Class TPX, TPY and TPZ
Requirements According to IEC61869-2 for Transformer Type, Class 5P/10P and 5PR/10PR
Requirements According to IEC61869-2 for Transformer Type, Class PX or IEC 60044-6 Class TPS
Requirements According to ANSI C57.13 for Transformer Type, Class C
Dimensioning Factors for the Distance Protection
Example 1 (Part 1/9)
Example 1 (Part 2/9)
Example 1 (Part 3/9)
Example 1 (Part 4/9)
Example 1 (Part 5/9)
Example 1 (Part 6/9)
Example 1 (Part 7/9)
Example 1 (Part 8/9)
Example 1 (Part 9/9)
