Measuring The Operating Limit Of Set Values - ABB RET670 Commissioning Manual
Transformer protection version 2.1 ansi
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Also See for RET670:
- Applications manual (1016 pages) ,
- Commissioning manual (328 pages) ,
- Installation and commissioning manual (240 pages)
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Section 10
Testing functionality by secondary injection
Test point
12
13
10.4.5.1
Measuring the operating limit of set values
Procedure:
1.
Subject the IED to healthy normal load conditions for at least two seconds.
2.
Apply the fault condition and slowly decrease the measured impedance to find the operating
value of the phase-to-phase fault for zone 1 according to test point 1 in figure
table 23. Compare the result of the measurement with the set value.
3.
Repeat steps
Observe that the zones that are not tested have to be blocked and the zone that is tested has
to be released.
4.
Repeat steps 1 to 3 above to find the operating value for the phase-to-ground fault L3-G
according to figure
10.4.5.2
Measuring the operating time of distance protection zones
Procedure:
1.
Subject the IED to healthy normal load conditions for at least two seconds.
2.
Apply the fault condition to find the operating time for the phase-to-phase fault according to
test point 10 in figure
with the setting
3.
Repeat steps
point 10 in figure
tPG .
4.
Repeat steps
Observe that the zones that are not tested have to be blocked and the zone that is tested has
to be released.
96
Reach
Value
X
0.5 x (2 x X1
+ X0
set
R
0.5 x (2 x R1
+ R0
set
X
0
R
RFPG
1
to
2
to find the operating value for test points 2, 3 in table23.
21
and table 24.
Test points 8, 9, 10 and 11 are intended to test the directional lines of
impedance protection. Since directionality is a common function for all 5
measuring zones, it is only necessary to test points 8, 9, 10 and 11 once, in the
forward direction in order to test the accuracy of directionality (directional
angles). Directional functionality testing (trip inside, no-trip outside) should
always be made for all impedance zones set with directionality (forward or
reverse).
20
and table
tPP .
1
to
2
to find the operating time for the phase-to-ground fault according to test
21
and table 24. Compare the result of the measurement with the setting
1
to
2
to find the operating time for all other used measuring zones.
Comments
)/3
set
)/3
set
23
for zone 1. Compare the result of the measurement
1MRK 504 154-UUS B
GUID-02EE80DB-CE52-49F0-99C4-14FD84766009 v3
20
and
GUID-9AEFB83B-A343-4965-BB41-59062CC0DB5F v3
Commissioning manual
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