Measuring The Operating Limit Of Set Values - ABB RET670 Commissioning Manual
Relion 670 series, transformer protection
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Also See for RET670:
- Applications manual (1016 pages) ,
- Commissioning manual (328 pages) ,
- Installation and commissioning manual (240 pages)
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Section 11
Testing functionality by secondary injection
11.4.8.1
136
Table 33:
Test points for phase-to-earth L3-E (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
+RFPEZx
4
X
0.5 x (2 x X1
R
0.5 x (2 x R1
RFPEZx
5
X
0.85 x RFPEZx
R
0.85 x RFPEZx
6
X
RLdFw
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
RFPEZx
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
+X0
)/3
set
set
+ X0
)/3
set
set
+ R0
)/3
set
set
+ X0
)/3
set
set
+ R0
)/3
set
set
set
+ R0
)/3
set
set
+R0
)/3 +
set
set
set
x tan(ArgLd
)
set
set
x tan(ArgLd
)
set
Set
set
set
set
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
Transformer protection RET670 2.2 IEC
1MRK 504 165-UEN A
Comments
ArgLd = 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 (2X1
+ X0
)/(3 x
set
set
tan(AgNegDir=30°)
GUID-24FEBCE7-3409-4204-AA15-A1E0A1605866 v3
Commissioning manual
)/3
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