GE D90 Plus Instruction Manual page 321

Line distance protection system

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Table of Contents

CHAPTER 7: PROTECTION

LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL

Figure 262: Directional comparison unblocking scheme configuration settings

The following settings are available.

Range: Enabled, Disabled

Default: Disabled

This setting enables and disables the directional comparison unblocking scheme.

Range: any FlexLogic operand

Default: OFF

This setting allows the user to assign any FlexLogic operand to block the directional

comparison unblocking scheme. Contact inputs from a pilot cut-out switch are typically

used for this purpose.

Permissive Echo

Range: Disabled, Enabled, Custom

Default: Disabled

Enabling this setting sends a permissive echo signal to the remote ends under certain

conditions (see the logic diagram). If set to "Custom," the echo signal is sent if a condition

selected with the

Echo Condition

the echo logic locks out for the time specified by the

of the echo pulse is programmable by the

only if no overreaching and reverse protection elements operate.

Echo Condition

Range: any FlexLogic operand

Default: OFF

This setting specifies and applies an echo condition when the

setting is satisfied. The echo is sent only once and then

Echo Lockout

Echo Duration

setting. The echo is returned

CONTROL ELEMENTS

setting. The duration

Permissive Echo