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
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:
Содержание SEL-351P
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