both analogue and digital, plus the

both analogue and digital, plus the state of the relay
outputs. It then has the capability to act as a disturbance
recorder for the circuit being monitored, so that by freezing the
memory at the instant of fault detection or trip, a record of the
disturbance is available for later download and analysis. It
may be inconvenient to download the record immediately, so
facilities may be provided to capture and store a number of
disturbances. In industrial and small distribution networks,
this may be all that is required. In transmission networks, it
may be necessary to provide a single recorder to monitor
several circuits simultaneously, and in this case, a separate
disturbance recorder is still required. For more information on
the different types of disturbance recording, see Chapter 22