Schweitzer Engineering Laboratories SEL-787-3 - Protection Features; Standard Protection Features; Additional Protection Features; Synchronism Check and Battery Monitor

Schweitzer Engineering Laboratories, Inc. SEL-787-3, -4 Data Sheet
3
➤
Standard Protection Features. Make use of standard dual-slope differential protection with harmonic blocking and
restraint for as many as four windings and as many as three independent restricted earth fault (REF) elements for
sensitive ground-fault detection in grounded wye-transformers. The SEL-787 Transformer Protection Relay allows
configuration of Winding 3 for either differential or REF protection. Refer to Table 3 for the available REF elements
based on the configuration of Winding 3. The relay also includes phase, negative-sequence, residual ground, and
neutral-ground overcurrent elements for backup protection. Breaker failure protection for as many as four three-pole
breakers also comes standard.
➤ Additional Protection Features. Take advantage of SEL-787-3E/S volts/hertz protection with frequency tracking
from 15 to 70 Hz for generator step-up and variable frequency applications. Use over- and underfrequency and over-
and undervoltage elements to implement load shedding and other control schemes on the relay.
➤ Synchronism Check/Station DC Battery Monitor. Program the VS/VBAT voltage channel in the SEL-787-3S
model to perform a synchronism check across a circuit breaker or to monitor dc voltage levels of the substation
battery.
➤ Transformer Monitoring. Measure accumulated through-fault levels with the transformer through-fault monitor.
Additionally, use the optional 4–20 mA or RTD thermal inputs to monitor ambient, load tap-changer (LTC) tank,
and transformer oil temperature.
➤ Operator Controls. Take advantage of eight programmable front-panel pushbuttons, each with two programmable
tricolor LEDs, for various uses, such as easy trip and close control and status indication for all the breakers. Use the
operator control interface pushbuttons to easily implement local and remote operator control schemes using 32 local
and 32 remote control bits. Use SEL
OGIC
®
control equations and slide-in, configurable front-panel labels to change
the function and identification of target LEDs and operator control pushbuttons and LEDs.
➤ Relay and Logic Settings Software. Use ACSELERATOR QuickSet
®
SEL-5030 Software to reduce engineering costs
related to relay settings and logic programming and to simplify development of SEL
OGIC control equations. Verify
proper CT polarity and phasing through use of the built-in phasor display.
➤ Metering and Reporting. Use built-in metering functions that eliminate separately mounted metering devices.
Analyze Sequential Events Recorder (SER) reports and oscillographic event reports for rapid commissioning,
testing, and post-fault diagnostics. Unsolicited SER protocol allows station-wide collection of binary SER messages.
➤ Additional Standard Features. Further enhance your power system protection by taking advantage of several other
SEL-787 standard features in communication, monitoring, and support. Modbus
®
RTU, Event Messenger support,
M
IRRORED BITS
®
communications, as well as load profile and breaker wear monitoring all come standard with the
SEL-787. The relay also supports 12 additional external RTDs (SEL-2600 series module), IRIG-B input, advanced
SEL
OGIC control equations, IEEE
®
C.37.118-compliant synchrophasor protocol, and an SEL-2812 compatible ST
®
fiber-optic serial port.
➤ Optional Features. Communicate with a number of additional optional communications protocols and ports,
digital/analog I/O, and RTDs. Optional communications protocols include IEC 61850, Modbus
®
TCP/IP, Simple
Network Time Protocol (SNTP), DNP3 LAN/WAN, DNP3 serial, and IEC 60870-5-103. Elective communications
ports include EIA-232 or EIA-485, and single or dual, copper or fiber-optic Ethernet ports. Several digital/analog
I/O options are available. These include 4 AI/4 AO, 4 DI/4 DO, 8 DI, 8 DO, 3 DI/4 DO/1 AO, and 4 DI/3 DO. An
optional 10 internal RTD card is also available for the SEL-787 relay.
➤ Language Support. Choose English or Spanish for your serial ports, including the front-panel serial port. The
standard relay front-panel overlay is in English; a Spanish overlay is available as an ordering option.