The SEL-2506 Rack-Mount Remote I/O Module has eight digital inputs, eight digital outputs, and a fiber-optic communications port. Connect an SEL-2506 to a fiber-optic port or transceiver on a protective relay to add digital I/O. Or, wire the SEL-2506 I/O to relay I/O to add SEL Mirrored Bits teleprotection.
Protection and Monitoring—Add simple bus protection using contact inputs and outputs from existing relays. Provide secure pilot communications for existing two- and three-terminal line applications. Add local or remote trip- and close-coil monitoring capability.
I/O Contact Expansion—Economically extend the number of I/O contacts on SEL relays that are Mirrored Bits communications-compatible.
Comprehensive Device Compatibility—Add Mirrored Bits communications to any protective relay (digital or electromechanical) or other intelligent electronic devices (IEDs) for advanced communications-based protection.
Enhanced System Reliability—Reduce or eliminate ground potential rise between IEDs by using fiber-optic links instead of conventional switchboard wiring.
LEDs indicate the input and output status, channel activity, device status, and communications channel health
Input and output LED labels are userconfigurable
Connectorized screw terminals accept ring lugs with wires up to #10 AWG
Level-sensitive contact inputs do not assert during dc grounds when applied to center-grounded systems
Output contacts are rated for trip and close duty
Standard serial or V-pin fiber port or optional ST® fiber port
Alarm contacts signal self-test and communications channel statuses
Wide-range power supply consumes less than 5 W
Protection and Monitoring
Add simple bus protection using contact inputs and outputs from existing relays. Add secure pilot communications to existing two- and three-terminal line applications. Add local or remote trip- and close-coil monitoring capability.
Allow clear indication of system function and status.
Expand the I/O of SEL relays that are Mirrored Bits-compatible.
Flexible Fiber-Optic Communications
Built-in bidirectional fiber-optic port. Ordering options provide operating ranges from 500 meters to 110 kilometers and compatibility with a variety of SEL fiber-optic transceivers and fiber types (see Table 1).
Replace control wiring to outside cabinets with fiber-optic cable to eliminate paths for dangerous voltages. All I/O terminals are behind the panel.
Use the communications monitoring feature to alarm when fiber-optic control cabling has been damaged, disturbed, or altered. Fiber-optic links are far less susceptible to electrical interference.
Easy Installation and Service
Install the rack-mount, compact two-rack-unit chassis. The SEL-2506 includes screw-terminal connector (STC) blocks for easy replacement of the unit.