Distance Protection Systems

The MiCOM Agile P441, P442 and P444 numerical full scheme distance relays provide flexible, fast and reliable protection of transmission and sub-transmission lines. They include full scheme 5-zone distance, plus aided directional earth fault (DEF) and comprehensive backup protection for utility lines and cables at all voltage levels, particularly oriented towards transmission grids.

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These distance protection systems are ideal for single circuit breaker application, single and/or 3-pole tripping, and includes a full suite of monitoring, control and recording capabilities plus fault locator, autoreclose and check synchronism.

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Key features:

• Dual algorithm distance operation for maximum fault detection dependability

• Deploy in digital substation architectures with merging units and non-conventional instrument transformers using IEC 61850-9-2 process bus

• Distance to fault location assists dispatching of maintenance crews 

• Full-scheme relay offers fast, discriminative response to double-circuit, cross-country and evolving faults

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Overview

The Agile P441, P442 and P444 have a settable quadrilateral operating characteristic that offers consistent 0.85-1.3 cycle zone 1 operating time for general distance application. Customers have a choice of cost-effective built-in teleprotection: InterMiCOM64 at 56/64 kbit/s for direct fiber or MUX links with 2 or 3 ended applications, or EIA (RS) 232 for MODEM links in 2 ended applications. The IEC 61850 redundant Ethernet supports self healing ring, RSTP, dual homing or PRP.

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Key benefits:

• Comprehensive communication options including IEC 61850 and redundant Ethernet ports

• IEC61850-9-2 interface option allows integration within digital substation process bus architectures

• Variety of built-in aided schemes over 2 channels

• Unparalleled speed, security and selectivity

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