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Cigré 2005, SC B5 Colloquium in Calgary Preferential Subject 1Question 8

Zoran GajićABB

Sweden

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SC B5: PS1, Q8; Multifunctional Transformer Relays

COMPLEXITY ISSUES

Relay Complexity

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Old Technology versus New Possibilities

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Old versus New

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New Technology Available for Relays as well

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Compare Apples with Apples not with Pears

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SC B5: PS1, Q8; Multifunctional Transformer Relays

ADAPTIVE TECHNIQUE

Adaptive Relays,

Use or not use new features

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Adaptive Relays – OLTC Position Reading

On-line OLTC position monitoring available since 1998

Via BCD or mA signal

Hundreds of installations

Excellent performance record

Improved Trafo Diff and Voltage Control functionality

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Adaptive Relays - Transformer Differential

Adaptive inrush restraint

Adaptive bias calculation for 1½ CB stations

Available since 1998

Thousands of installations

Excellent performance record

Improved Trafo Diff operation

Paper in WPRC 2003

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New Features

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New Feature –> Turn-to-Turn Fault Protection

Detects all turn-to-turn faults with more than 1% of shorted turns

Excellent add-on to the traditional differential protection

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New Features -> Complex Settings?