GE Industrial Solutions Entellisys System User Manual User Manual
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9
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Sequence of events, fault reports, and
waveform capture records
The Sequence of Events (SOE) record in Entellisys Low-Voltage switchgear is intended to provide
a detailed chronology of all system phenomena. This includes events related to enabled
protective and control functions as well as the monitoring system itself.
Each CPU buffers and maintains the last 1024 events it records. These event buffers are backed
up in non-volatile memory in the event of a system reset. The Entellisys local and remote HMIs
continuously poll each CPU and retrieve this information automatically as new events are
generated. Additionally, the HMI logs events related to it (e.g., operator logon, time
synchronization, etc.) and adds them to the locally stored record.
Some events result in the triggering of a waveform capture and fault report. These include
protection related alarms and events as well as commands issued to activate the opening or
closing of a circuit breaker. An association is maintained between each type of record to make it
easy to recall the relevant information when viewing a given event. Like event data, fault report
data is stored in non-volatile memory. Waveform records are stored only in volatile memory
within the CPU due to the volume of data in relation to available flash memory. The HMI retains
all retrieved records on its local hard drive. To maintain system performance, the HMI does not
automatically retrieve every waveform, only those that are requested for viewing by the user at
the time the request is made. It is possible to configure a SCADA system to perform automatic
retrieval for backup purposes.
For a complete listing of available events, descriptions, and tips for analyzing and
troubleshooting them, see