R
X
Distance measuring zone
Phase selection
”Quadrilateral” zone
(ohm/phase)
(ohm/phase)
en05000674.vsd
IEC05000674 V1 EN-US
Figure 165:
Operation characteristic for FRPSPDIS (21) in forward direction for
three-phase fault, ohm/phase domain
The result from rotation of the load characteristic at a fault between two phases is
presented in fig
. Since the load characteristic is based on the same measurement as
the quadrilateral characteristic, it will rotate with the quadrilateral characteristic
clockwise by 30 degrees when subject to a pure phase-to-phase fault. At the same time,
the characteristic "shrinks" by 2/√3, from the full RLdFw/RLdRv reach, which is valid
at load or three-phase fault.
Section 8
1MRK 504 163-UUS A
Impedance protection
350
Transformer protection RET670 2.2 ANSI
Application manual
Содержание RELION RET670
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