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REL 670 Line DistanceProtection IED

Substation Automation andProtection Training

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Main application

Line distance protectionterminal for:

Directly earthed networks

Isolated or impedance earthed

networksOH-lines and Cables

Series Compensated Lines

Double circuit lines

Single-, two- or three pole trip

Quadrilateral (IEC) or MHO(ANSI) characteristics

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Main characteristics

Line IED for protection,monitoring and control

Building block in Substation Automation Systems

Completely full scheme

Functional flexibility

Configuration flexibility

Extensive self- supervision

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Main features in REL 670

Typical operate time: One cycle

Simultaneous measurement ineach loop and advanced phase

selectionVery low requirement of time tosaturation for CTs includingmaximum remanence

Complete software library for allapplications

Full Bay control functionalityavailable.

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Single Breaker (A31, A32)

UN

3I>

1/3phO->I

79

SC/VC25/27

A BIload

Z59

3UBF50BF

52PDPD

Contr Interl

86/94I->O

TripBus

Single-Breaker application3 ph trip1/3 ph trip

60FF

*)

*) Only 1/3 ph trip alternative

DR

DR

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Multi-Breaker alternative (B31, B32)

Multi-Breaker application3 ph trip1/3 ph trip

DR

UN

3I>

1/3phO->I

79

SC/VC25/27

ABIload

Z59

3UBF50BF

52PDPD

3I>BF50BF

94PDPD

1/3phO->I

79

SC/VC25/27

3I>STUB

50STUB

Multi-Breaker add-on:50STUB3I>BFO->ISCPDTRIPFUSE FAIL

Contr Interl

86/94I->O

86/94I->O60

FF

60FF

*)

*) Only 1/3 ph trip alternative

*)DR

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Functionality Pre-configured IEDs (IEC)

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Measuring algorithm

u = i . R + X. di

o. dt

I

UXS XL RL

Same reliablealgorithm as REL5xx

Distance Protection algorithm

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Remote back-up Load encroachment

The green area represents theload encroachment area and cuts any impedanceprotection that might enter in it(in the example ZM03 andZM04).

ZM03

ZM02

ZM01

ZM04

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Export and import of load

ZL

Z