GE Multilin
D30 Line Distance Protection System
5-243
5 SETTINGS
5.9 TRANSDUCER INPUTS AND OUTPUTS
5
DCMA OUTPUT H1 SOURCE
: “SRC 1 P”
DCMA OUTPUT H1 RANGE
: “–1 to 1 mA”
DCMA OUTPUT H1 MIN VAL
: “–1.247 pu”
DCMA OUTPUT H1 MAX VAL
: “1.247 pu”
With the above settings, the output will represent the power with the scale of 1 mA per 20.65 MW. The worst-case error for
this application can be calculated by superimposing the following two sources of error:
•
±0.5% of the full scale for the analog output module, or
•
±1% of reading error for the active power at power factor of 0.9
For example at the reading of 20 MW, the worst-case error is 0.01
×
20 MW + 0.207 MW = 0.407 MW.
EXAMPLE: CURRENT MONITORING
The phase A current (true RMS value) is to be monitored via the H2 current output working with the range from 4 to 20 mA.
The CT ratio is 5000:5 and the maximum load current is 4200 A. The current should be monitored from 0 A upwards, allow-
ing for 50% overload.
The phase current with the 50% overload margin is:
(EQ 5.32)
The base unit for current (refer to the
FlexElements
section in this chapter for additional details) is:
(EQ 5.33)
The minimum and maximum power values to be monitored (in pu) are:
(EQ 5.34)
The following settings should be entered:
DCMA OUTPUT H2 SOURCE
: “SRC 1 Ia RMS”
DCMA OUTPUT H2 RANGE
: “4 to 20 mA”
DCMA OUTPUT H2 MIN VAL
: “0.000 pu”
DCMA OUTPUT H2 MAX VAL
: “1.260 pu”
The worst-case error for this application could be calculated by superimposing the following two sources of error:
•
±0.5% of the full scale for the analog output module, or
•
±0.25% of reading or ±0.1% of rated (whichever is greater) for currents between 0.1 and 2.0 of nominal
For example, at the reading of 4.2 kA, the worst-case error is max(0.0025
×
4.2 kA, 0.001
×
5 kA) + 0.504 kA = 0.515 kA.
EXAMPLE: VOLTAGE MONITORING
A positive-sequence voltage on a 400 kV system measured via source 2 is to be monitored by the DCmA H3 output with a
range of 0 to 1 mA. The VT secondary setting is 66.4 V, the VT ratio setting is 6024, and the VT connection setting is
“Delta”. The voltage should be monitored in the range from 70% to 110% of nominal.
The minimum and maximum positive-sequence voltages to be monitored are:
(EQ 5.35)
The base unit for voltage (refer to the
FlexElements
section in this chapter for additional details) is:
(EQ 5.36)
The minimum and maximum voltage values to be monitored (in pu) are:
(EQ 5.37)
The following settings should be entered:
0.005
±
1
1
–
( )
–
(
)
20.65 MW
×
×
0.207 MW
±
=
I
max
1.5 4.2 kA
×
6.3 kA
=
=
I
BASE
5 kA
=
minimum current
0 kA
5 kA
------------
0 pu, maximum current
6.3 kA
5 kA
-----------------
1.26 pu
=
=
=
=
0.005
20 4
–
(
)
6.3 kA
×
×
±
0.504 kA
±
=
V
min
0.7
400 kV
3
-------------------
×
161.66 kV,
V
max
1.1
400 kV
3
-------------------
×
254.03 kV
=
=
=
=
V
BASE
0.0664 kV 6024
×
400 kV
=
=
minimum voltage
161.66 kV
400 kV
---------------------------
0.404 pu, maximum voltage
254.03 kV
400 kV
---------------------------
0.635 pu
=
=
=
=
Summary of Contents for D30D00HCHF8AH6AM6BP8BX7A
Page 10: ...x D30 Line Distance Protection System GE Multilin TABLE OF CONTENTS...
Page 374: ...5 248 D30 Line Distance Protection System GE Multilin 5 10 TESTING 5 SETTINGS 5...
Page 398: ...6 24 D30 Line Distance Protection System GE Multilin 6 5 PRODUCT INFORMATION 6 ACTUAL VALUES 6...
Page 410: ...7 12 D30 Line Distance Protection System GE Multilin 7 2 TARGETS 7 COMMANDS AND TARGETS 7...
Page 444: ...9 24 D30 Line Distance Protection System GE Multilin 9 5 FAULT LOCATOR 9 THEORY OF OPERATION 9...
Page 576: ...B 102 D30 Line Distance Protection System GE Multilin B 4 MEMORY MAPPING APPENDIX B B...
Page 616: ...D 10 D30 Line Distance Protection System GE Multilin D 1 IEC 60870 5 104 PROTOCOL APPENDIX D D...
Page 628: ...E 12 D30 Line Distance Protection System GE Multilin E 2 DNP POINT LISTS APPENDIX E E...
Page 636: ...F 8 D30 Line Distance Protection System GE Multilin F 3 WARRANTY APPENDIX F F...
Page 646: ...x D30 Line Distance Protection System GE Multilin INDEX...
