Schweitzer Engineering SEL-351P - Introduction; Factory Default Settings; Installation Variations and Logic Changes; EZ Settings Vs. Regular Settings

Date Code 990215 Factory-Set Logic 1-1
SEL-351P Manual Técnico
SECTION 1: FACTORY-SET LOGIC
I NTRODUCTION
This section describes the factory-set logic (SEL OGIC
®
Control Equations, set with the SET L n
command) that makes the SEL-351P Recloser Control operate as a recloser control.
Section 3: Overcurrent, Voltage, Synchronism Check, and Frequency Elements through
Section 9: Setting the SEL-351P Recloser Control provide more settings information and
settings variation details. Important: Use this manual in conjunction with the SEL-351P
Quick-Start Installation and User’s Guide.
Factory Default Settings
Factory default settings are listed under subsection SHO Command (Show/View Settings) in
Section 10: Serial Port Communications and Commands.
Installation Variations and Logic Changes
For traditional recloser control installations (see Figure 2.1 in Section 2: Additional
Installation Details), none of the factory-set logic has to be changed. But for other recloser
control installation variations (see Figure 2.2 through Figure 2.4), some changes might be made
to the factory-set logic, as detailed in the text accompanying these figures. Also, if the SEL-351P
is applied in “nonstandard” applications (e.g., at a cogeneration interconnection point), changes
would probably be made to the factory-set logic. Section 9: Setting the SEL-351P Recloser
Control provides details on making settings changes.
EZ Settings vs. “Regular” Settings
The Settings section in the SEL-351P Quick-Start Installation and User’s Guide describes:
• EZ recloser control settings (set with SET EZ n command)
• EZ global settings (set with SET FZ command)
Section 9: Setting the SEL-351P Recloser Control describes:
• “regular” settings (set with SET n command)
• “regular” global settings (set with SET G command)
The EZ recloser control settings are a subset of the “regular” settings, but if the EZ recloser
control settings are enabled for a specific settings group n (n = 1 - 6), then the corresponding EZ
recloser control settings override and change certain “regular” settings for that settings group.
The EZ global settings override certain “regular” global settings if EZ recloser control settings
are enabled for at least settings group 1. Global setting EZGRPS determines if EZ recloser
control settings are enabled for a particular setting group.