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Section 11
Testing functionality by secondary injection
Table 31:
Test point
1
2
3
4
5
6
7
8
9
10
11
12
13
11.4.7.3
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 and table .
Compare the result of the measurement with the set value.
3.
Repeat steps
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
figure and table .
120
Test points for phase-to-earth L3-E (Ohm/Loop)
Reach
Value
X
(2 x X1
+X0
set
R
0
X
(2 x X1
+ X0
set
R
(2 x R1
+ R0
set
X
0.8 x (2 x X1
R
0.8 x (2 x R1
+RFPEZx
X
0.5 x (2 x X1
R
0.5 x (2 x R1
RFPEZx
X
0.85 x RFPEZx x tan(ArgLd)
R
0.85 x RFPEZx
X
RLdFw x tan(ArgLd)
R
RLdFw
X
0
R
RLdFw
X
-0.8 x R
x tan( ArgDir)
min
R
0.8 x R
min
X
-0.4 x R
x tan( ArgDir)
min
R
0.4 x R
min
X
0.5 x (2 x X1
R
-0.5 x (2 x X1
tan( ArgNegRes-90⁰)
X
0.8 x (2 x X1
R
-0.8 x (2 x X1
tan( ArgNegRes-90⁰)
X
0.5 x (2 x X1
R
0.5 x (2 x R1
X
0
R
RFPEZx
1
to
2
to find the operating value for test points 2, 3 in table
1
to
3
to find the operating value for the phase-to-earth fault L3-E according to
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Comments
)/3
set
)/3
set
)/3
set
+ X0
)/3
set
set
+ R0
)/3
set
set
+ X0
)/3
set
set
+R0
)/3 +
set
set
If RLdFw < 0.85 x RFPEZx
If RLdFw < RFPEZx
If RLdFw < RFPEZx
R
min
ArgDir = 15⁰ fixed
R
min
ArgDir = 15⁰ fixed
+ X0
)/3
ArgNegRes = 120⁰ fixed
set
set
Formula applies if R Set value < RFPEZx
+ X0
)/3 x
set
set
+ X0
)/3
ArgNegRes = 120⁰ fixed
set
set
Formula applies if R Set value < RFPEZx
+ X0
)/3 x
set
set
+ X0
)/3
set
set
+ R0
)/3
set
set
If RFPEZx < RLdFw
1MRK 504 165-UEN Rev. K
= minimum of RFPEZx and RLdFw
= minimum of RFPEZx and RLdFw
GUID-3FA4B640-38E7-406E-8FCC-8DEDABB024C4 v5
Transformer protection RET670
Commissioning manual
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