ZIV 7IRD-A - General Overview

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Chapter 1. Description

M7IRDA2003I

7IRD-A/J/M: Distribution Protection & Control Terminal

1-2

7IRD represents a family of integrateable microprocessor-based terminal units for

line/machine protection.

The 7IRD digital design is based on a powerful microprocessor and organized into models to

provide protection, control and metering functions. The protection provided by the standard

models includes: Complete protection of a given position; Monitoring and Annunciation

(remote and optionally local) of any device associated to that position; Analog values metering

(Current, Voltage, Power, …); Capture of information associated to that position, via digital

inputs; Possibility to perform programmable control functions and local interlockings.

7IRD terminal units can be applied individually or combined with other intelligent electronic

devices (IEDs) to form an integrated system for protecting and controlling medium voltage

lines, transformers, generators and feeders in general.

This instruction manual covers the 7IRD-A, 7IRD-J and 7IRD-M, and particular characteristics

are specified where are relevant.

1.1 General Overview

7IRD terminal equipment provides two different subsystems: protection and control. Both are

inter-communicated so that they can cooperate by information exchange, but always

maintaining separate identities for any kind of action. Main features that can be detailed are:

 Devices include independent power supplies for protection and control functions.

 Available communication ports are common for protection and control subsystems.

 Digital input and output contacts are separated for protection and control functions.

 Analog inputs measurement is performed by the protection subsystem thought

independent circuits. There is an option that allows that metering is performed by a

dedicated and specific module.