General Description And Application; General Description - GE GEK 106168E Instructions Manual

Digital breaker failure protection

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Table Of Contents

Table of Contents

1. 1. 1. 1.

1.1. GENERAL DESCRIPTION

The DBF system is a microprocessor based breaker failure protection, control and measurement unit that has

different algorithms to allow its use on a wide range of applications in power systems.

The functions and information management of the unit can be performed remotely (computer connected to the

serial port RS232, fiber-optic or modem) or locally using the man-machine interface (HMI), which includes a 20

keys keypad, and a two line liquid crystal display (LCD) on the front of the relay.

The system provides the following functions:

a) Protection

Low current level breaker failure protection, following a single or three phases initiation, with up to

two time delayed steps.

High current level breaker failure protection, following a two/three (selectable by setting) phases

initiation.

No current breaker failure protection, following a two/three (selectable by setting) phases initiation.

Breaker internal arc detection.

b) Monitoring

Current measurements for each phase and ground.

Breaker status

16 fully configurable LED indicators

One fixed relay status LED

Breaker health monitoring ( I 2 t).

Built-in self-check functions.

c) Analysis:

Event recorder

Oscillography

d) Control:

3 settings' tables

Time synchronization using the communications program, the IRIG-B input or the HMI (keypad and

display).

Configurable inputs and outputs.

User can build logic schemes using AND, OR and NOT gates and the internal digital signals of the

relay.

GEK-106168E