Schweitzer Engineering Laboratories SEL-351-7 - Page 4

ii Manual Change Information Date Code 20020426
SEL-351-5, -6, -7 Instruction Manual
Revision
Date
Summary of Revisions
− Added Figure 2.6 through Figure 2.9.
− Added Figure 2.21 through Figure 2.23.
Section 3:
− Added Table 3.9.
− Added Figure 3.23 and Figure 3.24.
− Updated subsection: Voltage Input VS Connected Phase-to-Phase or Beyond
Delta-Wye Transformer.
− Updated Table 3.10.
− Added Delta-connected voltages to subsection: Setting SYNCP.
− Added Delta-connected voltages to subsection: Setting Synchronism Check
Elements Voltage Inputs.
− Updated Figure 3.26 and Figure 3.27.
− Updated subsection: System Frequencies Determined from Voltages V
A
(or
V
AB
for Delta) and V
S
.
− Updated Figure 3.29.
− Added Figure 3.30.
− Updated subsection: Frequency Element Voltage Control.
− Updated Figure 3.32 through Figure 3.34, and accompanying text.
− Updated Table 3.12.
− Updated subsection: Positive-Sequence Reference Voltage, Vbase.
− Updated subsection: Vbase Initialization.
− Updated subsection: Vbase Tracking Range.
− Added Table 3.14.
− Added subsection: Power Element Time Delay Setting Considerations.
− Added subsection: Using Power Elements in the Relay Trip Equation.
− Added subsection: Single-Phase Power Element Calculations.
− Added subsection: Three-Phase Power Element Calculations.
Section 4:
− Updated Figure 4.1.
− Updated subsection: Loss-of-Potential Logic.
− Added Table 4.3 and related text.
− Added subsection: Zero-Sequence Voltage Sources.
− Updated Figure 4.6 (added Setting VNOM = OFF input).
− Updated Figure 4.7 and Figure 4.8 (added Relay Word bit 3V0 input).
− Updated Figure 4.12 through Figure 4.14.
− Updated Figure 4.15 and Figure 4.16 (added 32VE, 32NE, 3V0 Relay Word
inputs).