Description

GE / Alstom DBF Digital Breaker Failure

The DBF is a digital breaker failure relay that provides phase and ground backup protection if the primary circuit breaker fails to clear a system fault. Breaker failure protection is critical in any backup relaying scheme. This protection must have not only sensitivity and dependability, but also a high level of security because it is protecting the busbars. The reliability must also be the same as that of a busbar protection relay. By using digital technology the operation time of the DBF has been improved.

Protection and control:
• Two step instantaneous and/or time delayed breaker failure
• Phase instantaneous overcurrent
• Ground instantaneous overcurrent
• Three phase direct trip
• Internal arcing protection
• Operation failure detection
• Three settings groups
• 14 configurable inputs

Monitoring and Metering
• Current metering
• Breaker health monitoring
• Event recorder, last 165 events

User Interfaces
1. Keypad and Display
The DBF has a 20 button keypad and a 2 line by 16 character alphanumeric LCD. This allows local user interface without a computer.
2. LED Indicators
The DBF has 17 LED indicators. One is a two color system alarm. The other 16 are red, and are configurable to any of the 32 alarms available. Each LED can be configured with or without memory.
3. Communications
The DBF has three communications ports, one on the front panel which is connected to one on the rear panel, and a third independent rear panel port.
The first two ports allow communication through GE-LOCAL software, either locally with a laptop computer, or remotely to a protection dispatch center. This software allows the user to visualize measurements and status as well as the relay’s time synchronization.
The third port connects the user to a communications network, through GE-POWER software, to the part of a DDS integrated system. These applications are part of GE-NESIS (General Electric Network Substation Integration Software) used by the DDS system.

We offer GE’s century long tradition of power system innovation. From generators to transmission lines, to motors and beyond, we ensure dependable, safe power worldwide. GE offers a wide range of single function and auxiliary relays, along with a portfolio of accessories, to support high performing and reliable protection and control systems. To explore the GE portfolio with us click here GE numerical Relays !