ABB RET670 Commissioning Manual page 117

1MRK 504 165-UEN A
Transformer protection RET670 2.2 IEC
Commissioning manual
Testing functionality by secondary injection
To verify the settings for the operating points according to the following fault types
should be tested:
• One phase-to-phase fault
• One phase-to-earth fault
The shape of the operating characteristic depends on the values of the setting
parameters.
The figures illustrating the characteristic for the distance protection
function can be used for settings with and without load
encroachment. The solid lines designate the diagram applicable
when the load current compensation is active. The solid line and all
test points except 13 are valid for this case.
When the load current compensation is inactive, the dotted lines
and test point 13 are valid. Test points 5, 6, and 7 are not valid for
this measurement.
11
X1Zx
10
40% of RLdFw
80% of RLdFw
IEC05000368 V4 EN-US
Figure 23: Distance protection characteristic with test points for phase-to-
phase measurements
X
2
1
80%
3
50%
4
12
120°
a
5
6
R (Ohm/phase)
7 13
9
c
20°
8
0.5 x RFPPZx
IEC05000368-4-en.vsdx
Section 11
111