Description

GE DBT Digital Breaker Supervision

The DBT Digital Breaker Supervision is a digital relay that supervises the integrity of the breaker’s tripping and closing circuits. The relay checks the continuity of the coil regardless of the status of the breaker (open or closed). It also includes a time delay in order to avoid misoperations during open to closed transitions. It can supervise three different coils at the same time. It has a DC undervoltage unit which checks the breaker’s operating power supply voltage.

Protection
The DBT is a digital relay that supervises the integrity of the breaker’s tripping and closing coils. The relay checks the continuity of the coil regardless of the status of the breaker on single or three-pole tripping schemes. It can supervise three coils at the same time. A DC undervoltage unit checks the circuit breaker operating power supply voltage.
• Supervision of breaker coils
• Undervoltage unit

Monitoring and Metering
The DBT relay has an advantage over coil supervision relays which are based only on continuity, as it also measures real resistance. The advantage of this method is selectivity. The DBT is able to detect failures in the circuit breaker coils even when there are coils from different auxiliary circuits connected in parallel. In this situation a failure or a broken lead would not be detected based only on continuity, because there would be an alternative path in the parallel coil. The resistance measurement used by the DBT will detect this condition. In order to make this resistance measurement it injects a 5 mA current, measures the voltage drop, and calculates the resistance

• Features and Benefits
• Simple dip switch setting
• Compact 19″ rack mount case
• Digital technology
• Checks coil continuity regardless of breaker status
• Simultaneous supervision of up to three different coils
• Measures real resistance
• Time delay feature prevents misoperation

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 !