GE GEK 106168E manual General Description, Protection, ∙ Breaker internal arc detection Monitoring

	1. GENERAL DESCRIPTION AND APPLICATION
1.	GENERAL DESCRIPTION AND APPLICATION

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 (ΣI2 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 DBF Breaker Failure Protection 1