ABB RED670 Commissioning Manual page 128

Section 11
Testing functionality by secondary injection
Test point
5
6
7
8
9
10
11
12
13
11.4.7.3 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 and table . 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
and table .
122
Reach Value
X 0.85 x RFPG x tan(LdAngle)
R 0.85 x RFPG
X RLdFwd x tan(LdAngle)
R RLdFwd
X 0
R RLdFwd
X -0.8 x R x tan( ArgDir)
min
R 0.8 x R
min
X -0.4 x R x tan( ArgDir)
min
R 0.4 x R
min
X 0.5 x (2 x X1 + X0
set
R -0.5 x (2 x X1 + X0
set
tan( ArgNegRes-90⁰)
X 0.8 x (2 x X1 + X0
set
R -0.8 x (2 x X1 + X0
set
tan( ArgNegRes-90⁰)
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 table
1 to 3 to find the operating value for the phase-to-ground fault C-G according to figure
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 seven measuring
zones, it is only necessary to test 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).
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Comments
If RLdFwd < 0.85 x RFPG
If RLdFwd < RFPG
If RLdFwd < RFPG
R = minimum of RFPG & RLdFwd
min
ArgDir = 15⁰ fixed
)/3 ArgNegRes = 120⁰ fixed
set
Formula applies if R Set value < RFPG
)/3 x
set
)/3 ArgNegRes = 120⁰ fixed
set
Formula applies if R Set value < RFPG
)/3 x
set
)/3
set
)/3
set
If RFPG < RLdFwd
1MRK 505 378-UUS Rev. J
GUID-3FA4B640-38E7-406E-8FCC-8DEDABB024C4 v5
Line differential protection RED670
Commissioning manual