Measuring The Operating Limit Of Set Values - ABB RET670 Commissioning Manual
Transformer protection
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Also See for RET670:
- Applications manual (1016 pages) ,
- Commissioning manual (318 pages) ,
- Installation and commissioning manual (240 pages)
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1MRK 504 165-UUS -
11.4.7.1
Transformer protection RET670 2.2 ANSI
Commissioning manual
Table 29:
Test points for phase-to-ground C-G (Ohm/Loop)
Test point
Reach
Value
1
X
(2 x X1
R
0
2
X
(2 x X1
R
2 x R1
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 RLdFw
–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:
Testing functionality by secondary injection
+X0
)/3
set
set
+ X0
)/3
set
set
+ R0
)/3
set
set
+ X0
)/3
set
set
+ R0
)/3 +RFPG
set
set
set
+ R0
)/3
set
set
+R0
)/3 + RFPG
set
set
set
x tan(LdAngleset)
set
set
set
set
set
x tan(ArgDir=20°)
set
x tan(ArgDir=20°)
set
set
+ X0
)
set
set
+ X0
)
set
set
+X0
)
set
set
+ X0
)
set
set
+ X0
)/3
set
set
+ R0
)/3
set
set
Section 11
Comments
LdAngle = angle for the maximal load
transfer
Exact: 0.8 x RFPEZx x tan (ArgDir=20°)
Exact: 0.5 x (2 x X1
X0
)/3
set
set
Exact: 0.5 x (2X1
+ X0
)/(3 x
set
set
tan(AgNegDir=30°)
Exact: 0.8 x (2 x X1
+ X0
set
set
Exact: 0.8 x (2X1set + X0set)/(3 x
tan(AgNegDir=30°)
)/3
135
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