Measuring The Operating Limit Of Set Values - ABB RET670 Commissioning Manual

Section 11
Testing functionality by secondary injection
11.4.5.1
124
Test point Reach Value
4 X 0.5 x (2 x X1
R 0.5 x (2 x R1
RFPE
5 X 0.85 x RFPE
R 0.85 x RFPE
6 X RLdFwset x tan(ArgLdSet)
R RLdFw
7 X 0
R RLdFw
8 X –02143 x RLdFw
R 0.8 x RLdFw
9 X –0.8 x RLdFw
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 RFPE

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 above to find the operating value for the phase-to-earth
fault L3-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 5 measuring zones, it is only
+ R0 )/3
set set
+R0 )/3 +
set set
set
x tan(ArgLdset)
set
set
set
set
set
x tan(ArgDir)
set
set
+ X0 )
set set
+ X0 )
set set
+X0 )
set set
+ X0 )
set set
+ X0 )/3
set set
+ R0 )/3
set set
29 and table 26. Compare the result of the measurement
to find the operating value for test points 2, 3 in table26.
30 and table 27.
1MRK 504 165-UEN A
Comments
ArgLd = angle for the maximal load
transfer.
Exact: 0.8 x RFPE x tan (ArgDir)
Exact: 0.5 x (2 x X1 X0
set set
Exact: 0.5 x (2X1 + X0
set set
tan(AgNegDir90)
Exact: 0.8 x (2 x X1 + X0
set
Exact: 0.8 x (2X1set + X0set)/(3 x
tan(AngNegDir 90))
GUID-02EE80DB-CE52-49F0-99C4-14FD84766009 v3
Transformer protection RET670 2.2 IEC
Commissioning manual
)/3
)/(3 x
)/3
set