ABB RET670 - Page 135

Ensure that the maximum continuous current of an IED does not exceed four times its
rated value, if the measurement of the operating characteristics runs under constant
voltage conditions.
To verify the settings the operating points according to figures
31 and 32 should be tested.
See also tables 26 and 27 for information.
R
X
RFltFwdPG
1
3
)1( XNX +
5
2
4
ArgNegRes
85%
50% of RLdFwd
6
ANSI09000734-2-en.vsd
)
/(
loop
W
)/(
loop
W
7
ANSI09000734 V2 EN
Figure 31: Operating characteristic for phase selection function, forward direction
single-phase faults
1MRK 504 165-UUS - Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 129
Commissioning manual