Schweitzer Engineering Laboratories SEL-701 - Section 4: Settings Calculation; Introduction

Date Code 20010719 701 Motor Protection Relay
Section 4
Settings Calculation
Introduction
The SEL-701 Relay protection settings are divided into two major categories. The
first category, described in this section, includes settings to configure the motor
protection elements and basic functions. The second category, described in
Appendix B: SELogic® Control Equations & Relay Logic, includes logic settings that
allow you, if you wish, to customize the relay contact input and output operation. The
relay also includes settings that control the function of the serial ports and the
sequential events recorder (SER) function.
NOTE: Each SEL-701 Relay is shipped with default factory
settings summarized in
Appendix F: SEL-701 Relay
Settings Sheets. Calculate and enter settings for your motor
to ensure that the relay provides secure, dependable
protection.
This instruction manual section includes the following subsections:
Application Data. Lists information that you will need to know about the
protected motor before starting to calculate the relay settings.
General Data
. Lists settings that configure the relay inputs to accurately
measure and interpret the ac current and optional voltage input signals.
Basic Motor Protection
. Lists settings for protection elements that are
included in all models of the SEL-701 Relay, including the thermal
element, overcurrent elements, load-loss, and load-jam functions.
RTD-Based Protection
. Lists settings associated with the optional internal
RTD inputs (Relay Models 0701010X and 0701011X) or if the relay will
be connected to the SEL-2600 RTD Module. You can skip this
subsection if your application does not include RTD measuring.
Voltage-Based Protection (Relay Models 0701001X & 0701011X)
. Lists
settings associated with the optional ac voltage-based protection
elements. You can skip this subsection if your relay is not equipped with
optional voltage inputs.
Output Configuration
. Lists settings for the analog output, front-panel
display control, output contact fail-safe function, and additional settings
controlling the tripping functions for all relay models.
Serial Port Settings
. Lists settings that configure the relay front- and rear-
panel serial ports.