GE D90 Plus Instruction Manual page 357

Line distance protection system

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Table of Contents

CHAPTER 7: PROTECTION

Autoreclose lockout

LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL

When a reclose sequence is started by an initiate signal, the autoreclose scheme moves

into the reclose-in-progress state and starts the incomplete sequence timer. The setting of

this timer determines the maximum time interval allowed for a single reclose shot. If a

close breaker 1 or 2 signal is not present before this time expires, the scheme enters the

lockout state.

There are four other conditions that can take the scheme to the lockout state, as follows:

Receipt of the

input while in the reclose-in-progress state

The reclosing program logic: when a three-phase initiate is present and the

autoreclose mode is either "1 Pole" or "3 Pole-A" (three-pole autoreclose for single-pole

faults only)

Initiation of the scheme when the count is at the maximum allowed

If at the end of the reset time at least one breaker, which is not in the out-of-service

state, is open the scheme is sent to lockout. The scheme also is sent to lockout if one

breaker fails to reclose and the setting

Once the lockout state is set, it remains latched until one or more of the following occurs:

The scheme is intentionally reset from lockout, employing the

autorecloser

The breaker or breakers are closed manually from the panel switch, SCADA, or other

remote control through the

Ten seconds after breaker control detects that the breaker or breakers were closed

Breaker Failure Option

Breaker Manual Close

CONTROL ELEMENTS

setting is "Lockout."

setting of the