Basler Electric BE1-87T - Manual (Page 76)

4-34 BE1-87T Installation 9171300990 Rev V
Table 4-1. List of Variables
D
P
The driving input number, a procedural term designating the current input
terminal whose tap is the first selected. (The setting procedure is simplified if
the driving input is the input of least current, I
M
)
I
E
Maximum external fault current in multiples of tap (the larger of three-phase or
line-ground values)
I
D
Driving input relay current used for matching in amperes
I
F
The larger of I
F3
and I
FG
I
F3
Relay input current at the maximum external three-phase fault level in
secondary amperes
I
FG
Relay input current at the maximum external line-ground fault level in
secondary amperes
I
M
The input with the least minimum current
I
P
CT primary current in amperes
I
R
Relay input current in amperes
I
S
CT secondary current in amperes
I
T
Rated self-cooled current of the power transformer in multiples of tap
M
N
Current mismatch, with power transformer on its neutral tap
MR Multiple rating CT, i.e., a tapped CT
M
T
Total mismatch, including the maximum transformer tap excursion
N Total number of CT turns available
N
A
Number of CT turns in use
R
L
One-way lead resistance in ohms
R
W
CT winding resistance in ohms
R
R
Relay resistance in ohms
S Restrained slope setting (from 15 to 60%)
S
F
Saturation factor, which equals V
B
/V
CE
T Relay current tap (0.4 to 1.78 for 1 A CT, 2 to 8.9 for 5 A CT)
T
D
Desired tap, based on the current ratio
V
B
The larger of V
B3
or V
BG
V
B3
The CT burden voltage with I
F3
flowing
V
BG
The CT burden voltage with I
FG
flowing
V
C
Base accuracy class CT voltage rating
V
CE
Accuracy class CT effective voltage where not all turns are used, which equals
V
C
(N
A
/N)
x TAP Unrestrained pickup setting, in multiples of tap (6 to 21)