GE D90 Plus Instruction Manual page 335

Line distance protection system

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Table of Contents

CHAPTER 7: PROTECTION

Single-pole operation

Trip output settings

LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL

This element must be used in single-pole operation applications.

The trip output element performs the following applications for single-pole operations:

Determines if a single-pole operation is performed

Collects inputs to initiate three-pole tripping, the autorecloser, and breaker failure

Collects inputs to initiate single-pole tripping, the autorecloser, and breaker failure

Assigns a higher priority to pilot-aided scheme outputs than to exclusively local inputs

The trip output element works in association with the following D90

Breaker control

Open pole detector

Phase selector

These elements must be programmed and in-service for successful operation of the trip

output. The autorecloser must also be in the reset state before a single-pole trip can be

issued. Outputs from this element are also directly connected as initiate signals to the

breaker failure elements.

At least one internal protection element or digital input representing detection of a fault

must be available as an input to this element. In pilot-aided scheme applications, a timer

can be used to delay the output decision until data from a remote terminal is received from

communications facilities. This prevents a three-pole operation when a single-pole

operation is permitted.

Select the Settings > Protection > Control > Trip Output menu to access the trip output

CONTROL ELEMENTS