ABB DSD655-14D Thyristor battery

Description

The 1oo2D system has an architecture that consists of two parallel control branches that act
independently and with equal priority on the control decision. The common mode of operation
and any common source of failure is reduced.
Active self-tests instead of voting mechanisms reduces the probability of accumulated hidden
dangerous failures in the system.
The two parallel control branches read the field signals, execute the safety control logic,
calculate the control outputs and set the field output signals individually and independent of
each other. However, each control branch is able to set the field output signals only when its
diagnostics control gives an active permissive signal.

The combination of active self-testing with permissive control of any control action adds
optimal failure tolerance capability to the superior attributes of the 1oo2 architecture regarding
safety integrity.
Extensive and active self-tests with replication are implemented individually in both control
branches. Detected failures are generally isolated from causing any spurious interruption of the
process. In the event of correlated failure in both branches a fail-to-safe action takes place.

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