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

Section 10
Testing functionality by secondary injection
Test point
4
5
6
7
8
9
10
11
12
13
10.4.1.1

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
Compare the result of the measurement with the set value.
3. Repeat steps 1 to 2 to find the operating value for test points 2, 3 in table 17.
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 to find the operating value for the phase-to-ground fault C-E according to
figure
86
Reach Value
X 0.5 x (2 x X1 + R0
set
R 0.5 x (2 x R1 +R0
set
RFPE
set
X 0.85 x RFPE x tan(ArgLdset)
set
R 0.85 x RFPE
X RLdFwset x tan(ArgLdSet)
R RLdFw
set
X 0
R RLdFw
set
X –0.1072 x RLdFw
R 0.4 x RLdFw
set
X –0.8 x RLdFw
set
tan(ArgDir=20°)
R 0.8 x RLdFw
set
X 0.17 x (2 x X1
set
R -0.36 x (2 x X1
set
X 0.27 x (2 x X1
set
R –0.57 x (2 x X1
set
X 0.5 x (2 x X1 + X0
set
R 0.5 x (2 x R1 + R0
set
X 0
R RFPE
15 and table 18.
Comments
)/3
set
)/3 +
set
ArgLd = angle for the maximal load transfer
Exact: 0.4 x RFPE x tan (ArgDir=20°)
set
x
+ X0 ) Exact: 0.5 x (2 x X1
set
+ X0 ) Exact: 0.5 x (2X1
set
+X0 ) Exact: 0.8 x (2 x X1
set
+ X0 ) Exact: 0.8 x (2X1set + X0set)/(3 x tan(AgNegDir=30°)
set
)/3
set
)/3
set
Only used when RLdFw > RFPE
1MRK 504 154-UUS B
X0 )/3
set set
+ X0 )/(3 x tan(AgNegDir=30°)
set set
+ X0 )/3
set set
14 and table 17.
Commissioning manual
M14944-126 v8