Verifying The Settings - Hitachi RET670 Commissioning Manual

Section 11
Testing functionality by secondary injection
11.4.7.2

Verifying the settings

Measure operating characteristics during constant current conditions. Keep the measured current as
close as possible to its rated value or lower. But make sure it is higher than the set minimum
operating current.
Ensure that the maximum continuous current to the 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 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.
X1set
IEC05000368 V5 EN-US
Figure 35:
Table 30:
Test point
1
2
Table continues on next page
118
The figures illustrating the characteristic for the distance protection function can be
used when the load encroachment affects the zone characteristic and when it is not.
The solid lines designate the diagram applicable when the load encroachment is
overlapping with the zone. All the test points except 13 are valid for this case. When
the load encroachment does not overlap with the zone, the dotted lines and test
point 13 are valid. Test points 5, 6, and 7 are not valid for this measurement
however.
X
R1set
2
1
11
10
12
9
8
25% of RFPPZx/2
50% of RFPPZx/2
RFPPZx/2
Distance protection characteristic with test points for phase-to-phase
measurements
Test points for phase-to-phase loops L1-L2 (Ohm/phase)
Reach Set value
X X1
set
R 0
X X1
set
R R1
set
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80%
3
50%
4
5
6
R (Ohm/phase)
7 13
ArgDir
IEC05000368-5-en.vsdx
Comments
1MRK 504 165-UEN Rev. K
GUID-F01D9FAB-E554-402F-BA8A-F411F692292F v2
Transformer protection RET670
Commissioning manual