GE DBF, Instructions Manual

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1. GENERAL DESCRIPTION AND APPLICATION
GEK-106168E DBF Breaker Failure Protection 1
1. 1. 1. 1. GENERAL DESCRIPTION AND APPLICATION GENERAL DESCRIPTION AND APPLICATION GENERAL DESCRIPTION AND APPLICATION 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 (
Σ
I2 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.