Schweitzer Engineering SEL-351P - Time-Overcurrent Elements; Phase Time-Overcurrent Elements; Settings Ranges

3-16 Overcurrent, Voltage, Synchronism Check, and Frequency Elements Date Code 990430
SEL-351P Manual Técnico
Figure SECTION 3: .13: Levels 5 through 6 Negative-Sequence Instantaneous
Overcurrent Elements
T IME -O VERCURRENT E LEMENTS
Phase Time-Overcurrent Elements
Two phase time-overcurrent elements, 51P1T and 51P2T, are available. The elements are
enabled with the E51P enable setting as follows:
Table SECTION 3: .1: Available Phase Time-Overcurrent Elements
Time-Overcurrent
Element
Enabled with
Setting
Operating Current See Figure
51P1T
51P2T
E51P = 1 or 2
E51P = 2
I
P
, maximum of A-, B-, and
C-phase currents
Figure SECTION
3: .14
The following is an example of 51P1T element operation. 51P2T is similar.
Settings Ranges
Besides the settings involved with the Torque Control Switch operation in
Figure SECTION 3:
.14 and
Figure SECTION 3: .15, the 51P1T and 51P2T phase time-overcurrent elements have
the following settings: