ABB 615 Series - Page 388

Y Y
ni
nu
pri
CT
VT
= ⋅
sec
GUID-2F4EAEF7-0D92-477F-8D4C-00C7BEDE04CB V1 EN (Equation 36)
ni
CT
CT ratio for the residual current IG
nu
VT
VT ratio for the residual voltage VG
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 milliSiemens
A
V
milliSiemens
pri
= ⋅ =5 00
100 1
11547 100
4 33. .
GUID-9CFD2291-9894-4D04-9499-DF38F1F64D59 V1 EN (Equation 37)
Section 4 1MAC059074-MB A
Protection functions
382 615 series ANSI
Technical Manual