ABB RELION 670 SERIES Applications Manual page 147
Line distance protection
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Also See for RELION 670 SERIES:
- Technical manual (1432 pages) ,
- Technical reference manual (1232 pages) ,
- Applications manual (760 pages)
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1MRK 506 369-UUS -
Line distance protection REL670 2.2 ANSI
Application manual
Rl
Rct
ANSI05000427 V2 EN
Figure 50:
The high impedance principle for one phase with two current transformer
inputs
VR
R
Rres
I>
Protected Object
VR
a) Through load situation
VR
b) Through fault situation
VR
c) Internal faults
Section 7
Differential protection
Rl
Rct
ANSI05000427-2-en.vsd
141
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