Basler BE1-CDS220, Instruction Manual

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BE1-CDS220 Time Overcurrent Characteristic Curves A-3
Table A-2. Characteristic Curve Cross-Reference
Curve Curve Name Drawing No. Similar To
S1 S, S1, 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 (I
2
t) 99-1376 BS, IEC Very Inverse (I
2
t)
C C, Extremely Inverse (I
2
t) 99-1377 BS, IEC Extremely Inverse (I
2
t)
G G, Long Time Inverse (I
2
t) 99-1622 BS, IEC Long Time Inverse (I
2
t)
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 using BESTCOMS, S<g>-
51P/51N/51Q/151P/151N/151Q/251P/251N/251Q ASCII commands, or human-machine interface (HMI)
Screens 5.x.4.1 (51P/N/Q), 5.x.4.2 (151P/N/Q), and 5.x.4.3 (251P/N/Q). For more information, refer to
Section 4, Protection and Control, Overcurrent Protection, 51 - Time Overcurrent Protection.
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.
Basler Electric time current characteristics are determined by a linear mathematical equation. The
induction disk of an electromechanical relay has a certain degree of non linearity due to inertial and friction
effects. For this reason, even though every effort has been made to provide characteristic curves with
minimum deviation from the published electromechanical curves, slight deviations can exist between
them.