GE Multilin
D60 Line Distance Protection System
8-15
8 THEORY OF OPERATION
8.2 PHASE DISTANCE APPLIED TO POWER TRANSFORMERS
8
If applied at location H, the relay sees the following input signals:
The relay is set as follows:
XFMR VOL CONNECTION
= “Dy11”
XFMR CUR CONNECTION
= “Dy11”
Consequently, the following signals are applied to the phase AB distance element:
(EQ 8.1)
(EQ 8.2)
This results in the following apparent impedance:
(EQ 8.3)
The above value is a correct measure of the distance from the VT location to the fault. For relay location 2, this certainly
includes the positive-sequence impedance of the transformer:
(EQ 8.4)
Thus, 0.127
90° + 0.05779
85° = 0.1847
88.4° primary side or 2.569
88.4° on the secondary side.
The above example illustrates how the relay maintains correct reach for fault behind power transformers. When installed at
X, the relay shall be set to 0.687
85° secondary in order to reach to the fault shown in the figure. When installed at H,
the relay shall be set to 2.569
88.4° to ensure exactly same coverage.
See Chapter 9: Application of Settings for more information on setting calculations.
INPUT
PRIMARY
SECONDARY
VA
7.584 kV
–5.59°
69.95 V
–5.59°
VB
6.269 kV
–120.1°
54.52 V
–120.1°
VC
7.751 kV
125.5°
65.84 V
125.5°
IA
16.976 kA
–27.6°
10.61 A
–27.6°
IB
33.952 kA
152.4°
21.22 A
152.4°
IC
16.976 kA
–27.6°
10.61 A
–27.6°
V
1
3
-------
V
AB
V
BC
–
10.861 kV 59.9
primary or 94.45 V 59.9
secondary
=
=
I
3
I
B
–
58.860 kA
27.6
primary or 36.75 A
27.6
secondary
–
–
=
=
Z
app
V
I
----
94.45 kV 59.9
36.75 kA
27.6
–
----------------------------------------------
2.570
87.5
secondary
=
=
=
Z
T
at 13.8 kV
10
100
----------
13.8 kV
2
150 MVA
----------------------------
0.127
90
=
=
Z
L
at 13.8 kV
30.11
13.8
315
-----------
2
0.05779
85
=
=
Содержание D60
Страница 61: ...GE Multilin D60 Line Distance Protection System 2 31 2 PRODUCT DESCRIPTION 2 3 SPECIFICATIONS 2 ...
Страница 62: ...2 32 D60 Line Distance Protection System GE Multilin 2 3 SPECIFICATIONS 2 PRODUCT DESCRIPTION 2 ...
Страница 102: ...3 40 D60 Line Distance Protection System GE Multilin 3 3 DIRECT INPUT AND OUTPUT COMMUNICATIONS 3 HARDWARE 3 ...
Страница 134: ...4 32 D60 Line Distance Protection System GE Multilin 4 3 FACEPLATE INTERFACE 4 HUMAN INTERFACES 4 ...
Страница 508: ...5 374 D60 Line Distance Protection System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Страница 538: ...6 30 D60 Line Distance Protection System GE Multilin 6 5 PRODUCT INFORMATION 6 ACTUAL VALUES 6 ...
Страница 610: ...10 8 D60 Line Distance Protection System GE Multilin 10 2 BATTERIES 10 MAINTENANCE 10 ...
Страница 622: ...A 12 D60 Line Distance Protection System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Страница 745: ...GE Multilin D60 Line Distance Protection System B 123 APPENDIX B B 4 MEMORY MAPPING B ...
Страница 746: ...B 124 D60 Line Distance Protection System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Страница 776: ...C 30 D60 Line Distance Protection System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Страница 792: ...E 10 D60 Line Distance Protection System GE Multilin E 1 IEC 60870 5 104 PROTOCOL APPENDIX E E ...
Страница 804: ...F 12 D60 Line Distance Protection System GE Multilin F 2 DNP POINT LISTS APPENDIX F F ...
Страница 826: ...xii D60 Line Distance Protection System GE Multilin INDEX ...