ABB 615 series Technical Manual page 388

Section 4
Protection functions
382
ni
CT
Y Y
= ⋅
pri sec
nu
VT
GUID-2F4EAEF7-0D92-477F-8D4C-00C7BEDE04CB V1 EN
ni CT ratio for the residual current IG
CT
nu VT ratio for the residual voltage VG
VT
Example: Admittance setting in the secondary is 5.00 milliSiemens. The
CT ratio is 100/1 A and the VT ratio is 11547/100 V. The admittance
setting in the primary can be calculated.
Y 5 00 . milliSiemens
= ⋅
pri
11547 100
GUID-9CFD2291-9894-4D04-9499-DF38F1F64D59 V1 EN
100 1 A
4 33 . milliSiemens
=
V
1MAC059074-MB A
(Equation 36)
(Equation 37)
615 series ANSI
Technical Manual