ABB RET670 - Measuring the Operating Limit of Set Values

Table 31: Test points for phase-to-ground C-G (Ohm/Loop)
Test point Reach Value Comments
1 X (2 x X1
set
+X0
set
)/3
R 0
2 X (2 x X1
set
+ X0
set
)/3
R 2 x R1
set
+ R0
set
)/3
3 X 0.8 x (2 x X1
set
+ X0
set
)/3
R 0.8 x (2 x R1
set
+ R0
set
)/3
+RFPGZx
set
4 X 0.5 x (2 x X1
set
+ R0
set
)/3
R 0.5 x (2 x R1
set
+R0
set
)/3 +
RFPGZx
set
5 X 0.85 x RFPGZx
set
x tan(LdAngle
set
) LdAngle = angle for the maximal load
transfer
R 0.85 x RFPGZx
6 X RLdFwdset x tan(LdAngleSet)
R RLdFwd
set
7 X 0
R RLdFwd
set
8 X –02143 x RLdFwd
set
Exact: 0.8 x RFPGZx x tan (ArgDir=20°)
R 0.8 x RLdFwd
set
9 X –0.8 x RLdFwd
set
x tan(ArgDir=20°)
R 0.8 x RLdFwd
set
10 X 0.17 x (2 x X1
set
+ X0
set
) Exact: 0.5 x (2 x X1
set
X0
set
)/3
R -0.36 x (2 x X1
set
+ X0
set
) Exact: 0.5 x (2X1
set
+ X0
set
)/(3 x
tan(AgNegDir=30°)
11 X 0.27 x (2 x X1
set
+X0
set
) Exact: 0.8 x (2 x X1
set
+ X0
set
)/3
R –0.57 x (2 x X1
set
+ X0
set
) Exact: 0.8 x (2X1
set
+ X0
set
)/(3 x
tan(AgNegDir=30°)
12 X 0.5 x (2 x X1
set
+ X0
set
)/3
R 0.5 x (2 x R1
set
+ R0
set
)/3
13 X 0
R
11.4.8.1 Measuring the operating limit of set values
Procedure:
Section 11 1MRK 504 165-UUS -
Testing functionality by secondary injection
140 Transformer protection RET670 2.2 ANSI
Commissioning manual