REB500 bay protection (optional)

The system provides an option to extend the functional scope of REB500 by a set of predefined bay protection

functions used as main 2 or back-up line protection.

Version ‘Line variant L-V2’ includes distance, directional/non directional overcurrent and directional earthfault protection functions (see Table 2).

As regards the level of voltages and frequencies busbar and station protection have the same application area.

For details on application and technical data refer to the REB500 Application Manual for bay protection functions.

Main features

Low-impedance busbar protection

· High functional reliability due to two independent measurement criteria:

– stabilized differential current algorithm

– directional current comparison algorithm

· Short tripping times independent of the plant’s size or busbar configuration

· Phase Segregated measurement

· Stub and T-zone protection

· Reduced CT performance requirements

– High through-fault stability even in case of CT saturation

– No switching of CT circuits