ABB Switzerland Ltd REG 316*4 1MRB520049-Uen / Rev. F
3-18
3.4.2. Entering the c.t./v.t. channels
(see Section 5.5.5.)
Edit A/D channel type
If K=00 is set for the hardware configuration, c.t. and v.t.
channels can be entered in any order, providing a corresponding
input transformer unit is fitted.
Edit A/D nominal value
Enter the rated values for the c.t’s and v.t’s in the input
transformer unit (1 A, 2 A, 5 A, 100 V or 200 V). S and T phases
of three-phase channels assume the same value as R phase.
Edit A/D prim/sec ratio
These values are only of relevance in connection with the
IEC60870-5-103 protocol. S and T phases of three-phase c.t.
and v.t. channels assume the same value as R phase.
Edit A/D channel ref. val.
The reference value settings enable differences between the
ratings of protected unit, c.t. or v.t. and protection to be compen-
sated. They are a factor which can be set in the range 0.5 to 2.
The setting for R phase applies also to the other two phases of
three-phase channels.
Reference value for voltage channels =
GN N2
NN
UU
UU
´
´
1
Reference value for current channels =
GN N2
NN
II
II
´
´
1
where:
U
GN
, I
GN
- rated data of the protected unit (generator,
power transformer, motor etc.)
U
N1
, U
N2
- primary, respectively secondary v.t. ratings
I
N1
, I
N2
- primary, respectively secondary c.t. ratings
U
N
, I
N
- protection rated voltage and current
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