ABB RED615 Technical Manual page 326

Section 4
Protection functions
320
Table 316: Operation criteria
Operation mode
Yo
Bo
Go
Yo, Go
Yo, Bo
Go, Bo
Yo, Go, Bo
The options for the Directional mode setting are "Non-directional", "Forward" and
"Reverse".
Figure 159, Figure 160
supported by EFPADM and the settings relevant to that particular characteristic.
The most typical characteristics are highlighted and explained in details in the
chapter Neutral admittance characteristics
calculated neutral admittance Yo moves outside the characteristic (the operation
area is marked with gray).
The settings defining the admittance characteristics are given in
primary milliSiemens (mS). The conversion equation for the
admittance from secondary to primary is:
Y = Y
pri sec
GUID-2F4EAEF7-0D92-477F-8D4C-00C7BEDE04CB V1 EN
ni CT ratio for the residual current Io
CT
nu VT ratio for the residual voltage Uo
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
pri
GUID-9CFD2291-9894-4D04-9499-DF38F1F64D59 V1 EN
Description
Admittance criterion
Susceptance criterion
Conductance criterion
Admittance criterion combined with the
conductance criterion
Admittance criterion combined with the
susceptance criterion
Conductance criterion combined with the
susceptance criterion
Admittance criterion combined with the
conductance and susceptance criterion
and Figure 161 illustrate the admittance characteristics
. Operation is achieved when the
ni
CT
⋅
nu
VT
A
100 1
milliSiemens ⋅
11547 100
1YHT530004D05 D
= . milliSiemens
4 33
V
Technical Manual
(Equation 28)
615 series