Date Code 20081022 Instruction Manual SEL-787 Relay
Section 5
Metering and Monitoring
Instructi on Manual
Overview
The SEL-787 Transformer Protection Relay includes metering functions to
display the present values of current, voltage (if included), analog inputs (if
included), and RTD measurements (with the external SEL-2600 series RTD
Module or an internal RTD card).
The relay provides the following methods to read the present meter values:
➤ Front-panel rotating display
➤ Front-panel menu
➤ EIA-232 serial ports (using SEL ASCII text commands or
ACSELERATOR
®
QuickSet
™
SEL-5030 Software)
➤ Telnet via Ethernet port
➤ Modbus
®
via EIA-485 port or EIA-232 port
➤ Modbus
TCP via Ethernet port
➤ DNP3 Serial via EIA-232 port or EIA-485 port
➤ DNP3 LAN/WAN via Ethernet port
➤ DeviceNet port
➤ Analog outputs
➤ IEC 61850 via Ethernet port
➤ C37.118 Synchrophasor Protocol via serial port
Load monitoring and trending are possible using the Load Profile function.
The relay automatically configures itself to save up to 17 quantities (selected
from the Analog Quantities) every 5, 10, 15, 30, or 60 minutes. The data are
stored in nonvolatile memory. As many as 4000 time samples are stored.
The SEL-787 has a through-fault event monitoring function that gathers
current level, duration and date/time for each through fault experienced by the
transformer. The function calculates and tracks accumulated I
2
t through fault
and alarms excess I
2
t over time. This monitor function can be used to schedule
proactive transformer bank maintenance.
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