Standard events are further sub-categorised internally to include different pieces of information. These are:● Protection events (starts and trips)● Maintenance record events● Platform eventsNote:The first event in the list (event 0) is the most recent event to have occurred.2.1.1 OPTO-INPUT EVENTSIf one or more of the opto-inputs has changed state since the last time the protection algorithm ran (which runs atseveral times per cycle), a new event is created, which logs the logic states of all opto-inputs. You can tell whichopto-input has changed state by comparing the new event with the previous one.The description of this event type, as shown in the Event Text cell is always Logic Inputs # where # is thebatch number of the opto-inputs. This is '1', for the first batch of opto-inputs and '2' for the second batch of opto-inputs (if applicable).The event value shown in the Event Value cell for this type of event is a binary string. This shows the logical statesof the opto-inputs, where the Least Significant Bit (LSB), on the right corresponds to the first opto-input Input L1.The same information is also shown in the Opto I/P Status cell in the SYSTEM DATA column. This information isupdated continuously, whereas the information in the event log is a snapshot at the time when the event wascreated.2.1.2 CONTACT EVENTSIf one or more of the output relays (also known as output contacts) has changed state since the last time theprotection algorithm ran (which runs at several times per cycle), a new event is created, which logs the logic statesof all output relays. You can tell which output relay has changed state by comparing the new event with theprevious one.The description of this event type, as shown in the Event Text cell is always Output Contacts # where # is thebatch number of the output relay contacts. This is '1', for the first batch of output contacts and '2' for the secondbatch of output contacts (if applicable).The event value shown in the Event Value cell for this type of event is a binary string. This shows the logical statesof the output relays, where the LSB (on the right) corresponds to the first output contact Output R1.The same information is also shown in the Relay O/P Status cell in the SYSTEM DATA column. This information isupdated continuously, whereas the information in the event log is a snapshot at the time when the event wascreated.2.1.3 ALARM EVENTSThe IED monitors itself on power up and continually thereafter. If it notices any problems, it will register an alarmevent.The description of this event type, as shown in the Event Text cell is cell dependent on the type of alarm and will beone of those shown in the following tables, followed by OFF or ON.The event value shown in the Event Value cell for this type of event is a 32 bit binary string. There are one or morebanks 32 bit registers, depending on the device model. These contain all the alarm types and their logic states (ONor OFF).The same information is also shown in the Alarm Status (n) cells in the SYSTEM DATA column. This information isupdated continuously, whereas the information in the event log is a snapshot at the time when the event wascreated.P14D Chapter 14 - Monitoring and ControlP14D-TM-EN-8 285
