ABB REC670 Applications Manual page 140
Relion 670 series, bay control
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Also See for REC670:
- Applications manual (628 pages) ,
- Commissioning manual (218 pages) ,
- Product manual (139 pages)
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Section 7
Differential protection
134
Rl
Rct
ANSI05000427 V2 EN-US
Figure 49:
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
1MRK 511 401-UUS A
Rl
Rct
ANSI05000427-2-en.vsd
Bay control REC670 2.2 ANSI
Application manual
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