Micom P721, Technical Manual

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P72x/EN CT/A11 Communication database
Page 24/78 MiCOM P721/P723
3.11.1 Meaning of each value channel
•
IA, IB, IC and I
O
channels:
The value is an signed 16 bits word equivalent to the ADC value
3.11.2 Calculation formula for phase current values
Line phase current value (primary value) = phase sampled value x phase primary CT / phase
internal CT ratio (mapping address 0007 = 800) x
√
2
3.11.3 Calculation formula for earth current values
Line earth current value (primary value) = earth sampled value (e.g. word 10 or 14) x earth
primary CT / earth internal CT ratio (mapping address 0008h) x
√
2
3.11.4 Logic channels
Logic channel MODBUS & DNP 3.0 IEC 61870-5-103
Bit 0 Trip relay (RL1) Earth Starting
Bit 1 Output relay 2 General Starting
Bit 2 Output relay 3 CB Fail
Bit 3 Output relay 4 General Trip
Bit 4 Watch-dog relay [95] tSUP
Bit 5 Output relay 5 [87] tDIFF
Bit 6 Output relay 6 Reserved
Bit 7 Output relay 7 [95N] tSUP
Bit 8 Output relay 8 [87N] tDIFF
Bit 9 Reserved Reserved
Bit 10 Logic input 1 Logic input 1
Bit 11 Logic input 2 Logic input 2
Bit 12 Logic input 3 Logic input 3
Bit 13 Logic input 4 Logic input 4
Bit 14 Logic input 5 Logic input 5
Bit 15 Reserved Reserved
3.12 Page 22h – Disturbance record index frame
Disturbance record index frame (7 to 9 Words)
Access in word reading ( function 03 )
Addresses Contents
2200h Disturbance data index frame
Disturbance record index frame
Word Contents
n° 1 Disturbance record number
n° 2 Disturbance record finish date (second)
n° 3 Disturbance record finish date (second)
n° 4 Disturbance record finish date (millisecond)
n° 5 Disturbance record finish date (millisecond)
n° 6 Disturbance record starting condition:
1: tripping command (RL1)
2: instantaneous
3: remote command
4: logic input
n° 7 Frequency at the post-time beginning
n° 8 (=0) Optional
n° 9 (=0) Optional