Hitachi RED670 Commissioning Manual page 122

Section 11
Testing functionality by secondary injection
Test point
3
4
5
6
7
8
9
10
11
12
13
(2 x X1set+X0set)/3
IEC05000369 V5 EN-US
Figure 34:
116
Reach Set value
X 0.8 x X1
set
R 0.8 x R1 + RFPPZx/2
set
X 0.5 x X1
set
R 0.5 x R1 + RFPPZx/2
set
X 0.85 x RFPPZx/2 x tan (ArgLd)
R 0.85 x RFPPZx/2
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 X1
set
R -0.5 x X1 x
set
tan( ArgNegRes-90⁰)
X 0.8 x X1
set
R -0.8 x X1 x
set
tan( ArgNegRes-90⁰)
X 0.5 x X1
set
R 0.5 x R1
set
X 0
R 0.5 x RFPPZx
X
2
1
11
10
12
9
8
25% of RFPEZx
50% of RFPEZx
alt. 80% of
RFPEZx
RFPEZx (Load
encroachment)
Distance protection characteristic with test points for phase-to-earth
measurements
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Comments
If RLdFw < 0.85 x RFPPZx/2
If RLdFw < RFPPZx/2
If RLdFw < RFPPZx/2
R = minimum of RFPPZx/2 and RLdFw
min
ArgDir = 20⁰ fixed
R = minimum of RFPPZx/2 and RLdFw
min
ArgDir = 20⁰ fixed
ArgNegRes = 120⁰ fixed
Formula applies if R set value < RFPPZx/2
ArgNegRes = 120⁰ fixed
Formula applies if R set value < RFPPZx/2
If RFPPZx/2 < RLdFw
80%
3
50%
4
5
6
R (Ohm/loop)
7
13
ArgDir
IEC05000369-5-en.vsdx
1MRK 505 378-UEN Rev. K
Line differential protection RED670
Commissioning manual