BE1-951
Appendix
A-3
Table A-2. Characteristic Curve Cross-Reference
Curve
Curve Name
Drawing No.
Similar To
S1
S, Short Inverse
99-1369
ABB CO-2
S2
S2, Short Inverse
99-1595
GE IAC-55
L1
L, L1, Long Inverse
99-1370
ABB CO-5
L2
L2, Long Inverse
99-1594
GE IAC-66
D
D, Definite Time
99-1371
ABB CO-6
M
M, Moderately Inverse
99-1372
ABB CO-7
I1
I, I1 Inverse Time
99-1373
ABB CO-8
I2
I2 Inverse Time
99-1597
GE IAC-51
V1
V, V1 Very Inverse
99-1374
ABB CO-9
V2
V2, Very Inverse
99-1596
GE IAC-53
E1
E, E1 Extremely Inverse
99-1375
ABB CO-11
E2
E2, Extremely Inverse
99-1598
GE IAC-77
A
A Standard Inverse
99-1621
BS, IEC Standard Inverse
B
B, Very Inverse (It)
99-1376
BS, IEC Very Inverse (I
2
t)
C
Extremely Inverse (I
2
t)
99-1377
BS, IEC Extremely Inverse (I
2
t)
G
Long Time Inverse
99-1622
BS, IEC Long Time Inverse
F
Fixed Time
N/A
N/A
P
Programmable
N/A
N/A
Time Dial Setting Cross-Reference
Although the time characteristic curve shapes have been optimized for each relay, time dial settings of
Basler Electric relays are not identical to the settings of electromechanical induction disk overcurrent relays.
Table A-3 helps you convert the time dial settings of induction disk relays to the equivalent setting for Basler
Electric relays. Enter time dial settings at HMI screens 5.X.4.1 (51P), 5.X.4.2 (51N), 5.X.4.3 (151N), and
5.X.4.4 (51Q). Enter time dial settings through the communication ports using the S<g>-51P/51N/151N/51Q
commands. For more information, refer to Section 4,
Protection and Control Functions, 51 Overcurrent
Functions.
Using Table A-3
Cross-reference table values were obtained by inspection of published electromechanical time current
characteristic curves. The time delay for a current of five times tap was entered into the time dial calculator
function for each time dial setting. The equivalent Basler Electric time dial setting was then entered into the
cross-reference table.
If your electromechanical relay time dial setting is between the values provided in the table, it will be
necessary to interpolate (estimate the correct intermediate value) between the electromechanical setting
and the Basler Electric setting.
Basler Electric relays have a maximum time dial setting of 9.9. The Basler Electric equivalent time dial
setting for the electromechanical maximum setting is provided in the cross reference table even if it exceeds
9.9. This allows interpolation as noted above.
