1.7
Date Code 20170927 Instruction Manual SEL-751 Relay
Introduction and Specifications
Applications
Accessories
Contact your Technical Service Center or the SEL factory for additional detail
and ordering information for the following accessories:
➤ External RTD protection
➢ SEL-2600 RTD Module (with ST
option only)
➢ A simplex 62.5/125 µm fiber-optic cable with ST
connector for connecting the external RTD module to
the SEL-751
➤ SEL-2505 Remote I/O Module (with SEL-2812 compatible ST
fiber-optic port) for connection to relay fiber-optic serial Port 2,
or use SEL-2505 with EIA-232 (DB-9) serial port to connect to
EIA-232 Port 3 on the relay.
➤ SEL-C804 and SEL-C814 Multimode Fiber-Optic Arc-Flash
Detection (AFD) Sensors and Accessories
➤ SEL-751 Configurable Labels
➤ Rack-Mounting Kits
➢ For one relay
➢ For two relays
➢ For one relay and a test switch
➤ Wall-Mounting Kits
➤ Bezels for Retrofit
➤ Replacement Rear Connector Kit
➤ Dust Protection Kit
➤ Relay Wire Termination Kits—See Application Note
AN2014-08.
For all SEL-751 mounting accessories for competitor products, including
adapter plates, visit selinc.com/applications/mountingselector/.
Applications
The SEL-751 Feeder Protection Relay has many power system protection,
monitoring, and control applications. Figure 1.1 shows some of the typical
protection applications for the SEL-751. You can use the SEL-751 directional
and nondirectional overcurrent functions to protect virtually any power system
circuit or device including lines, feeders, transformers, capacitor banks,
reactors, and generators. Over- and underfrequency, over- and undervoltage,
and synchronism-check elements are well suited for applications at distributed
generation sites. Directional power elements in the SEL-751 also make the
relay suitable for utility or customer interface protection where customer
generation is present.
You can use powerful SEL
OGIC control equations in all SEL-751 models to
provide custom protection and control applications. SEL application guides
and technical support personnel are available to help with unique applications.
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