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

1MRK 504 165-UUS -
11.4.5.1
Transformer protection RET670 2.2 ANSI
Commissioning manual
Test point Reach Value
3 X 0.8 x (2 x X1
R 0.8 x (2 x R1
4 X 0.5 x (2 x X1
R 0.5 x (2 x R1
5 X 0.85 x RFPG
R 0.85 x RFPG
6 X RLdFwdset x tan(LdAngleSet)
R RLdFwd
7 X 0
R RLdFwd
8 X –02143 x RLdFwd
R 0.8 x RLdFwd
9 X –0.8 x RLdFwd
R 0.8 x RLdFwd
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 RFPG

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 29 and table 24. Compare the result of the measurement with the set value.
3. Repeat steps 1 to 2
Testing functionality by secondary injection
+ X0 )/3
set set
+ R0 )/3 +RFPG
set set
+ R0 )/3
set set
+R0 )/3 + RFPG
set set
x tan(LdAngleset)
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
to find the operating value for test points 2, 3 in table24.
Section 11
Comments
set
set
LdAngle = angle for the maximal load
transfer.
Exact: 0.8 x RFPG x tan (ArgDir)
Exact: 0.5 x (2 x X1 X0
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))
)/3
set
)/(3 x
)/3
set
127