Measuring The Operating Limit Of Set Values; Measuring The Operating Time Of Distance Protection Zones - ABB RET670 Commissioning Manual

Section 11
Testing functionality by secondary injection
11.4.7.1
11.4.7.2
132
Test point Reach Value
9 X –0.8 x RLdFw
–0.8 x RLdFwd
tan(ArgDir=20°)
R 0.8 x RLdFw
10 X 0.17 x (2 x X1
R -0.36 x (2 x X1
11 X 0.27 x (2 x X1
R –0.57 x (2 x X1
12 X 0.5 x (2 x X1
R 0.5 x (2 x R1
13 X 0
R RFPEZx

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
with the set value.
3. Repeat steps 1 to 2
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
E 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 six 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).

Measuring the operating time of distance protection zones

Procedure:
x tan(ArgDir=20°)
set
x
set
set
+ X0 )
set set
+ X0 )
set set
+X0 )
set set
+ X0 )
set set
+ X0 )/3
set set
+ R0 )/3
set set
33 and table 30. Compare the result of the measurement
to find the operating value for test points 2, 3 in table
to find the operating value for the phase-to-earth fault L3-
34 and table 31.
1MRK 504 165-UEN A
Comments
Exact: 0.5 x (2 x X1 X0
set set
Exact: 0.5 x (2X1 + X0
set set
tan(AgNegDir=30°)
Exact: 0.8 x (2 x X1 + X0
set
Exact: 0.8 x (2X1set + X0set)/(3 x
tan(AgNegDir=30°)
GUID-3FA4B640-38E7-406E-8FCC-8DEDABB024C4 v4
GUID-BB93C603-F43E-40CB-8EFA-3B0F280C011D v5
Transformer protection RET670 2.2 IEC
Commissioning manual
)/3
)/(3 x
)/3
set
30