Autoreclose In Progress Logic Diagram For Cb2; Sequence Counter; Figure 164: Autoreclose In Progress Logic Diagram For Cb2 (Module 17) - GE MiCOM P40 Technical Manual

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Table of Contents

Chapter 11 - Autoreclose

AUTORECLOSE IN PROGRESS LOGIC DIAGRAM FOR CB2

CB2 Ext Trip A

CB2 Ext Trip B

CB2 Ext Trip C

CB2 Ext Trip 3ph

CB2 TMEM2/3 Ph

CB2 F3 PAROK

CB2 LO Alarm

Set CB2 Close

CB2 Closed 3 ph

Follower CB2

The Autoreclose logic includes a counter for counting the number of Autoreclose shots. This is referred to as the

sequence counter. The sequence counter has a value of zero if Autoreclose is not in progress. Following a trip, and

subsequent Autoreclose initiation, the sequence counter is incremented. The counter provides output signals

indicating how many initiation events have occurred in any Autoreclose cycle. These signals are available as user

indications and are used in the logic to select the appropriate dead times or, for a persistent fault, force a lockout.

It is possible to skip the first Autoreclose attempt by enabling the AR Skip Shot 1 setting. If this is set, the sequence

counter will skip the first Autoreclose attempt (Shot 1) and move to the second (Shot 2) immediately upon

Autoreclose initiation. Each time the protection trips the sequence counter is incremented by 1. The Autoreclose

logic compares the sequence counter value to the number of Autoreclose shots setting AR Shots. If the counter

value exceeds this setting then the Autoreclose is locked out. If Autoreclose is successful, the sequence counter

resets to zero.

P446SV-TM-EN-1