- However the information from these relays is limited to data from signal contacts included in the relays.
- Separate transducer for voltage and currents can however be added to conventional relays.
- Signals from the conventional relays can be hardwired to the numerical ones. By this arrangement both existing relays and new numerical relays can communicate via a com-mon fibre-optic bus. This makes the concept suitable for partial retrofit as well as com-pletely new installations.
- The ABB Substation Automation concept has five corner stones.
- Protection
- Communication
- Control
- Monitoring
- Tools
- One of the main advantages of ABB Substa-tion Automation is that it may include build-ing blocks from various product ranges and generations. High performance and total quality are the major requirements for each building block.
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