Schweitzer Engineering SEL-351P, Быстрый старт

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3-6 Overcurrent, Voltage, Synchronism Check, and Frequency Elements Date Code 990430
SEL-351P Manual Técnico
67P1TC = IN105 Input IN105 deasserted (67P1TC = IN105 = logical 0):
Then phase instantaneous/definite-time overcurrent elements 67P1/67P1T
are defeated and nonoperational, regardless of any other setting.
Input IN105 asserted (67P1TC = IN105 = logical 1):
Then only the corresponding directional control input from Figure 4.18 has
to be considered in the control of phase instantaneous/definite-time
overcurrent elements 67P1/67P1T.
If directional control enable setting E32 =N, then phase
instantaneous/definite-time overcurrent elements 67P1/67P1T are enabled
and nondirectional.
Sometimes SEL
OGIC
Control Equation torque control settings are set to provide directional
control. See Directional Control Provided by Torque Control Settings at the end of Section 4:
Loss-of-Potential, Load Encroachment, and Directional Element Logic .
Combined Single-Phase Instantaneous Overcurrent Elements
The single-phase instantaneous overcurrent element Relay Word bit outputs in Figure SECTION
3: .1 are combined together in Figure SECTION 3: .4 on a per phase basis, producing Relay
Word bit outputs 50A, 50B, and 50C.
Relay Word bits 50A, 50B, and 50C can be used to indicate the presence or absence of current in
a particular phase.
Figure SECTION 3: .4: Combined Single-Phase Instantaneous Overcurrent
Elements
Pickup and Reset Time Curves
Figure SECTION 3: .5 and Figure SECTION 3: .6 show pickup and reset time curves applicable
to all nondirectional instantaneous overcurrent elements in the SEL-351P (60 Hz or 50 Hz