Date Code 20081022 Instruction Manual SEL-787 Relay
Section 4
Protection and Logic Functions
Instructi on Manual
Overview
NOTE: Each SEL-787 is shipped with
default factory settings. Calculate the
settings for your application to ensure
secure and dependable protection.
Document and enter the settings (see
Section 6: Settings).
This section describes the SEL-787 Transformer Protection Relay settings,
including the protection elements and basic functions, control I/O logic, as
well as the settings that control the communications ports and front-panel
displays.
This section includes the following subsections:
Application Data. Lists information that you will need to know about the
protected equipment before calculating the relay settings.
Group Settings (SET Command). Lists settings that configure the relay
inputs to accurately measure and interpret the ac current and optional
voltage input signals.
Basic Protection. Lists settings for the differential, optional restricted
earth fault, and the overcurrent protection elements.
RTD-Based Protection. Lists settings associated with the RTD inputs. You
can skip this subsection if your application does not include RTD
inputs.
Voltage-Based Protection. 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.
Demand Metering. Lists settings associated with demand metering.
Trip/Close Logic. Lists Trip and Close logic.
Logic Settings (SET L Command). Lists settings associated with latches,
timers, and output contacts.
Global Settings (SET G Command). Lists settings that allow you to
configure the relay to your power system, date format, analog
inputs/outputs, and logic equations of global nature.
Port Settings (SET P Command). Lists settings that configure the relay
front and rear ports.
Front-Panel Settings (SET F Command). Lists settings for the front-panel
display, pushbuttons, and LED control.
Report Settings (SET R Command). Lists settings for the sequential event
reports, event reports, and load profile reports.
DNP Map Settings (SET DNP n Command, n = 1, 2, or 3). Shows DNP user map
register settings.
Modbus Map Settings (SET M Command). Shows Modbus
®
user map
register settings.
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