Micom P721, Technical Manual

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P72x/EN CT/A11 Communication database
Page 30/78 MiCOM P721/P723
3.17.2 Calculation formula for phase current values
Line phase current value (primary value) = phase sampled value (e.g. address 3800h, 3801h
or 3802h) x phase primary CT x (1 / phase internal CT ratio*) x
√
2
(*) Mapping address 0007h
3.17.3 Calculation formula for earth current values
Line earth current value (primary value) = earth sampled value (e.g. address 3803h) x earth
primary CT x (1 / earth internal CT ratio*) x
√
2
(*) Mapping address 0008h
3.18 Pages 3Dh – Disturbance records number available
Number of disturbance records available
Access in word reading ( function 03 )
Addresses Contents
3D00h Number of disturbance records available
Word n° 1: Number of disturbance records available
Word n° 2: Oldest disturbance record number (n)
Words n° 3 & 4: Oldest disturbance record date (second)
Words n° 5 & 6: Oldest disturbance record date (millisecond)
Word n° 7: Disturbance record starting origin
1= trip relay (RL1)
2= instantaneous threshold
3= remote command
4= logic input
Word n° 8: Acknowledge
Word n° 9: Number of Previous Disturbance record (n+1)
Words n° 10 & 11: Previous disturbance record date (second)
Words n° 12 & 13: Previous disturbance record date (millisecond)
Word n° 14: Disturbance record starting origin
1= trip relay (RL1)
2= instantaneous threshold
3= remote command
4= logic input
Word n° 15: Acknowledge
Word n° 16: Number of Previous Disturbance record (n+2)
Words n° 17 & 18: Previous disturbance record date (second)
Words n° 19 & 20: Previous disturbance record date (millisecond)
Word n° 21: Disturbance record starting origin
1= trip relay (RL1)
2= instantaneous threshold
3= remote command
4= logic input
Word n° 22: Acknowledge
Word n° 23: Number of Previous Disturbance record (n+3)
Words n° 24 & 25: Previous disturbance record date (second)