87L Channel Monitoring
To aid in commissioning and to help maintain security and dependability, the SEL-787L provides a set of channel monitoring and alarming functions. 87L Communications Report
The SEL-787L provides an 87L communications report to visualize and summarize basic 87L configuration as well as real-time and historical channel monitoring and alarming values. The report includes 87L configuration information, diagnostics, channel health information, a channel delay histogram, and worst-case channel delay information. Directional Overcurrent Protection
Use overcurrent elements with directional control, and optimize radial and looped network protection for lines and equipment. Best Choice Ground Directional Element logic optimizes directional element performance and eliminates the need for many directional settings. The relay also supports high-impedance grounded, ungrounded, and Petersen coil-grounded systems in relays with the 200 mA neutral current transformer option. The 200 mA CT option can also be used for nondirectional sensitive earth fault (SEF) protection. Optional Protection Features
Use the SEL-787L with the voltage inputs and arc-flash detection options to provide synchronism check, dc station battery monitoring, and arc-flash detection. An optional expansion card includes Vsync/Vbat with seven digital inputs or four arc-flash inputs. The LEA current/voltage input card supports voltage sensor inputs as well as Rogowski coil or low-power current transformer (LPCT) inputs for small enclosure installations. Incipient Fault Detection
Identify potential cable failures to extend asset life and minimize unexpected downtime. The SEL-787L checks for self-extinguishing half-cycle faults, which provides an indication of imminent cable failures. Cold-Load Pickup Element
Cold-load pickup takes place when a distribution circuit is reenergized following an extended outage. It can result in current levels significantly higher than normal peak load levels. This excess amount of current draw could be falsely identified as an overcurrent condition by the relay. The cold-load pickup element identifies possible cold-load pickup events per the settings in a distribution line after an outage. Thermal Element
Protect cables and cable insulation against thermal damage using the IEC line/cable thermal (49) element. Optional Vector Shift
Detect islanding conditions and prevent damage to local generation by detecting voltage angle shifts upon loss of bulk generation. Open-Conductor Detection
Apply the SEL-787L to detect and isolate open conductors. The SEL-787L incorporates phase discontinuity detection and optional broken-conductor detection to provide a reliable solution for open-conductor faults that convert to high-impedance faults. Optional Touchscreen Display
The easy-to-use touchscreen interface provides a one-line mimic display for bay control and monitoring. View metered quantities, phasor diagrams, relay settings, event summaries, target statuses, Sequential Events Recorder (SER) data, and more. Extensive testing shows that the robust capacitive touchscreen display meets or exceeds industry standards as well as SEL quality and reliability requirements. The touchscreen overlay can be configured in English or Spanish. Easy Communications
Choose from Ethernet or serial communications and several protocols, including IEC 60870-5-103, Mirrored Bits communications, EtherNet/IP, IEEE 1588 PTP, and IEC 61850 Edition 2.1. Pick multiple sessions of Modbus TCP, Modbus serial, DNP3 LAN/WAN, or DNP3 serial for custom configuration of your applications. When dual-Ethernet ports are selected, the relay also supports RSTP, IEC 62439-3 PRP, and fast failover switching. IEC 61850 Edition 2.1 Communications Protocol
Combine IEC 61850, an Ethernet network, and the SEL-787L for the fastest overall performance for substation automation and control. Streamline configuration of IEC 61850-enabled relays with acSELerator Architect SEL-5032 Software. Improve security using the password authentication and session time-out features. Transfer event files in COMTRADE and CEV formats as well as CID files, settings, and reports. IEC 61850 Test Mode
Use the IEC 61850 Test Mode to test system components in energized substations without fear of operating control output contacts. Web Server Access
The built-in web server enables secure, remote access to the relay with password protection. You can download status reports or view metering and relay information remotely. This helps minimize trips to the relay location, saving time and money. Accelerate Firmware Downloads
Simplify maintenance by downloading relay firmware via the Ethernet port. This also enables you to access and update all of your network relays simultaneously. Simple Network Time Protocol (SNTP)
Simplify wiring and installation by receiving a time signal over existing Ethernet networks. The 5 ms accuracy of SNTP is ideal for basic time synchronization throughout a substation, and it is a good backup to more accurate IRIG-B time synchronization. Built-In IEEE C37.118 Synchrophasors
Monitor distribution networks to detect a potential cascading voltage collapse before it happens. IEEE C37.118 synchrophasors, at up to 60 messages per second, allow access to system values for wide-area monitoring and control. The IEEE C37.118 standard simplifies communication and data coordination between synchrophasor measurement units. Expanded SELogic Control Equations
Use math and logic combinations of analog and digital values for customized applications. Adapt system control based on pre-fault conditions. Scale analog values and latch momentary inputs for SCADA retrieval. Enhanced Security on Heavily Loaded Feeders
Employ load-encroachment logic to set phase overcurrent elements independently of load levels. Easy Installation
Easily install the SEL-787L into existing locations using available retrofit kits and mounting adapters, with no cutting or drilling. Choose from many installation and integration options given the relay’s small form factor and slide-in expansion card options. Rugged Design
Trust the industry’s widest ambient operating temperature range, –40° to +85°C (–40° to +185°F). The SEL-787L withstands vibration, electrical surges, fast transients, and extreme temperatures, meeting stringent industry standards. A conformal-coating option for the printed circuit boards provides an additional barrier to airborne contaminants, such as hydrogen sulfide, chlorine, salt, and moisture.
- Directional Overcurrent Elements
- Pushbutton Options Available on Two-Line Display Model
- Sensitive Ground Fault Protection
- High-Impedance Fault Detection Using AST
- Flexible I/O for Local Control and System Applications
The base system includes three digital outputs (DO) and two digital inputs (DI). There are three card slots for optional SELect I/O cards, including the following:
- 4 current inputs and 3-phase voltage inputs (SELect 4 ACI/3 AVI)
- LEA voltage sensor inputs, Rogowski coil/LPCT current inputs, and conventional 200 mA sensitive neutral input
- 2 ac voltage inputs (300 V Vsync or 8 V LEA Vsync and Vbat) and 4 arc-flash detection input (AFDI) sensor inputs
- 2 ac voltage inputs (300 V Vsync or 8 V LEA Vsync and Vbat) and 4 AFDI sensor inputs
- 8 AFDI sensor inputs
- 4 current inputs and 3-phase LEA voltage (8 Vrms) inputs for LEA voltage sensors
- 14 DI
- 4 DI and 4 DO
- 4 DI and 4 fast, high-current interrupting DO
- 4 DI and one Form B DO or 2 Form C DO
- 4 DO, 3 DI, and 1 analog output (AO)
- 4 analog inputs (AI) and 4 AO
- 8 AI for dc process values
- 8 DI
- 8 DO
- 10 RTD inputs
- Integrated Communications
The SEL-787L offers many communications media and protocol options. Versatile communications options provide fast integration into both new and existing applications.
- Communications Media
- Ethernet 10/100BASE-T
- Ethernet 100BASE-FX
- Single- or dual-Ethernet ports
- EIA-232 serial
- EIA-485 serial
- 87L Communications
- Fiber-optic serial multimode ST
- Fiber-optic serial single-mode ST
- Communications Protocols
- Mirrored Bits communications
- IEC 61850 Edition 2
- IEC 60870-5-103
- IEC 62439-3 PRP and RSTP for models with dual Ethernet
- DNP3 LAN/WAN
- DNP3 serial
- Modbus TCP
- Modbus RTU
- Telnet
- FTP
- EtherNet/IP
- IEEE 1588 PTP
- IEEE C37.118 synchrophasors
- Simple Network Time Protocol (SNTP)
- Fixed GOOSE
- Languages
An ordering option is available for English or Spanish language support. - Retrofit Replacement Kits
Replace existing feeder protection with the SEL-787L and the applicable mounting kits. These kits provide the parts needed to easily replace many older feeder relays with the SEL-787L. Find other mounting options with the SEL Mounting Selector. - Conformal Coating
Protect equipment from harsh environments and airborne contaminants, such as hydrogen sulfide, chlorine, salt, and moisture. - Projection Mounting Collars Available in 45 and 90 mm
Projection Mounting Collars Instruction Sheet
Find other mounting options with the SEL Mounting Selector.
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