ABB Relion 670 Series Technical Reference Manual page 718

Line differential protection ansi

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Table of Contents

Interlocking for breaker-and-a-half diameter BH (3)

Introduction

The interlocking for breaker-and-a-half diameter (BH_CONN(3), BH_LINE_A(3),

BH_LINE_B(3)) functions are used for lines connected to a breaker-and-a-half

diameter according to figure 365.

Switch status of 289 and 2089 are valid (open or closed)

Switch status of 789 is valid (open or closed)

Switch status of 189 and 289 are valid (open or closed)

Status of the bus coupler apparatuses between WA1

and WA2 are valid

Status of the bus coupler app. between WA1 and WA7

Status of the bus coupler app. between WA2 and WA7

Technical reference manual

1MRK505222-UUS C

Relion red670