CHAPTER 5: SETTINGS
PRODUCT SETUP
B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
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5
Scaling using factors <1 can be required in such cases. The calculation is outlined in the IEC 60870-5-103 chapter of
the UR Family Communications Guide. Two examples follow, where you decide factors a and b.
Example 1
: Nominal power Pn = 100 MW = 100000 KW (power is transmitted in KW)
Since P can be both positive and negative:
Transmitted power Pt = (4095/(Pn*2.4)) * P = (4095/(100000 * 2.4) ) * P
= 0.017 * P
a = 0.017
b = 0
Pt = 0.017 * P
For a max power 100000 KW * 2.4 = 240000 KW, we transmit
Pt = 0.017 * 240000 = 4080
A value above 240 MW is indicated by overflow.
Example 2
: Nominal voltage Vn = 500000 V
Since RMS voltage V can be only positive:
Transmitted voltage Vt = (8191/(Vn*2.4)) * V - 4096 =
= (8191/(500000 * 2.4) ) * V - 4096 = 0.0068 * V - 4096
a = 0.0068
Since the step is in increments of 0.001, we round it at:
a = 0.006
b = -4096
Vt = 0.006 * V - 4096
For max voltage 500000 V * 2.4 = 1200000 V, we transmit
Vt = 0.006 * 1200000 - 4096 = 7200 - 4096 = 3104
SETTINGS
PRODUCT SETUP
COMMUNICATIONS
IEC 60870-5-103
IEC103 COMMANDS
IEC103 COMMANDS
COMMAND 0
See below
COMMAND 1
COMMAND 31
COMMAND 0
COMMAND 0 FUN:
0
Range: 0 to 255 in steps of 1
COMMAND 0 INF:
0
Range: 0 to 255 in steps of 1
COMMAND 0 ON:
Off
Range: Virtual input
COMMAND 0 OFF:
Off
Range: Virtual input
COMMAND 31
COMMAND 31 FUN:
0
Range: 0 to 255 in steps of 1
Summary of Contents for b30
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Page 486: ...5 278 B30 BUS DIFFERENTIAL SYSTEM INSTRUCTION MANUAL TESTING CHAPTER 5 SETTINGS 5 ...
Page 616: ...iv B30 BUS DIFFERENTIAL SYSTEM INSTRUCTION MANUAL ABBREVIATIONS ...
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