Sel SEL-2505 User Manual

Date Code 20010214 SEL-2505 Remote I/O Module
SEL-2505 Remote I/O Module
Instruction Manual
The SEL-2505 is a remote I/O module
that has eight contact inputs and eight
contact outputs. The status of these
inputs and outputs are communicated
between the SEL-2505 and host device
using M
IRRORED BITS™ communica-
tions over a dedicated fiber-optic port.
Each contact input controls one of the
eight M
IRRORED BITS transmit bits,
while each of the eight received
M
IRRORED BITS controls a Form C
output contact. Use the transmitted
contact input status for control and
indication of a remote device.
 Communications Ability
helps you simplify and
improve existing or new
installations.
 Add bus protection using
existing relay contact
inputs and outputs.
 Add simple pilot
communications to existing two- or three-terminal line applications.
 Isolate relay and breaker dc supplies for breaker failure trip distribution schemes.
 Replace control wiring to outside cabinets with fiber to reduce dc ground exposure.
 Add local or remote trip and close coil monitoring capabilities.
 Compact Size permits panel-mount replacement of existing auxiliary relays.
 Self-Testing increases reliability of auxiliary relay functions.
 Simple Diagnostics consisting of 22 LEDs that indicate contact input, output, channel, and
device status.
 Fiber Optics and Channel Monitoring increase scheme security.
 Three Models provide a wide range of applicable communication paths: 650 nm multimode
fiber for communications paths ≤500 m, 850 nm multimode fiber for paths ≤15 km, or 1300 nm
single-mode fiber for paths
≤80 km.
 Fast Operating Speed compares with high-speed auxiliary relays.
Features, Benefits, and Applications

Sel SEL-2505 Specifications

General

Brand	Sel
Model	SEL-2505
Category	I/O Systems
Language	English

Summary

Features, Benefits, and Applications

Communications Ability

Self-Testing

Increases the reliability of auxiliary relay functions through built-in testing.

Simple Diagnostics

Fiber Optics and Channel Monitoring

Enhances scheme security using fiber optics and monitoring capabilities.

Product Overview

Functional Overview

Applications

Add Communications-Assisted Tripping

Isolated Remote-Tripping

Bus Protection Applications

Distribution Bus Protection Example

Radial Feeders Application

Illustrates bus and line protection for a radial system using SEL-2505.

Functional Description

MIRRORED BITS Decoder/Encoder and I/O Control

Details the MIRRORED BIT decoder, encoder, and I/O control functionality.

Configuring the SEL-2505

Transmit and Receive Address Settings

Configures TX and RX addresses using dip switches for communication.

Security Counts for Received Data

Baud Rate and Device Connection

Baud Rate Settings

Lists settings for baud rates (38400, 19200, 9600) for fiber connections.

Connecting to Other SEL Devices

Details requirements for connecting SEL-2505 to other SEL devices via fiber.

Testing the SEL-2505

Configuration Settings Check

Verifies dip-switch settings for transmit address and baud rate.

Ground and Power Supply Connection

LED and Alarm Contact Test

Fiber-Optic Connection Test

Specifications

Terminal Connections and Output Contacts

Details terminal connection requirements and output contact performance.

Optoisolated Inputs and Power Supply

Type Tests and Certifications