Basler Electric BE1-51/27C - Manual (Page 8)

2 9137200998 Rev E
Adjustment of the overcurrent pickup point is provided by controls on the relay front panel. Time delay is a
function of the characteristic curve that has been selected. Time delay is settable from 00 to 99 on the
TIME DIAL thumbwheel switch located on the front panel. Curve type is selected either as an option or, in
some models, is switch selectable.
Sixty-nine characteristic curves and three timing options are available:
Characteristic curves:
•
Seven inverse time
•
Nine I 2 t
•
Seven inverse time with extended timing range
•
Nine I 2 t with extended timing range
•
Five British Standard 142 (E curves)
•
Seven integrating inverse time
•
Nine integrating I 2 t
•
Seven integrating inverse time with extended timing range
•
Nine integrating I 2 t with extended timing range
Timing option Z1 (switch-selectable, 16-position) B and C curves:
•
Seven inverse time
•
Nine I 2 t
Timing option Z1 with option 2-D or 2-E (switch-selectable, 16-position) B and C curves:
•
Seven inverse time with extended timing range
•
Nine I 2 t with extended timing range
Timing option Z2 (switch-selectable, 16-position) B and E (British Standard 142) curves:
•
Seven inverse time
•
One I 2 t
•
Five British Standard (BS) 142 (E curves)
Timing option Z2 with option 2-D or 2-E (switch-selectable, 16-position) B and E (BS142) curves:
•
Seven inverse time with extended timing range
•
One I 2 t with extended timing range
•
Five British Standard 142 (E curves)
Timing option Z3 (switch-selectable, 16-position) integrating B and C curves:
•
Seven integrating inverse time
•
Nine integrating I 2 t
Timing option Z3 with option 2-D or 2-E (switch-selectable, 16-position) integrating extended B and C
curves:
•
Seven integrating inverse time with extended timing range
•
Nine integrating I 2 t with extended timing range
Characteristic curves are shown by the graphs in the Time Overcurrent Characteristic Curves chapter.
Note that each graph (i.e. function) consists of a set of representative curves. Each curve (as well as any
between-curve interpolation) is selectable by the front panel TIME DIAL using a two-digit destination from
00 to 99. Because of space limitations, each graph shows only 14 of the 100 possible selections.
Non-Integrating Timing
Timing options Z1 and Z2 and the characteristic curves available with those options use non-integrating
timing. Non-integrating timing is accomplished by timing at a gate that is not solely dependent on the
magnitude of the applied multiple of pickup current. The time-out value is calculated based on the type of
time curve characteristic selected, time dial setting, and the magnitude of the applied multiple of pickup
current. The time-out value is continuously updated during the timing cycle. When pickup is exceeded, a
timer is initiated. When the timer elapsed time exceeds the calculated time-out value, a time trip output
signal is generated.
Introduction BE1-51/27C